A reusable mold for molding plastic articles

Abstract

The application relates to the technical field of multiplexing molds, and discloses a multiplexing mold for plastic product forming, which comprises a cabinet body, a forming bin fixedly connected to the right side of a cabinet body table top, a forming mold connected in the forming bin, a demolding mechanism for pushing the forming mold to open and close to realize forming and demolding, an injection molding mechanism arranged on the left side of the cabinet body table top to feed the forming mold, and a recycling mechanism arranged below the demolding mechanism; wherein the forming mold comprises a fixed mold. The multiplexing mold for plastic product forming can effectively solve the problem that, in the prior art, when a square opening box body type injection molding part is injection molded, the edge plate joint part is prone to burrs due to the influence of mold cooling channel layout, cooling liquid flow state and the like, and the phenomenon is aggravated and the number of water gate materials is increased due to insufficient cooling; the conventional centralized recycling water gate material mode causes the water gate material to be polluted during transfer, and a crushing, cleaning and other process needs to be additionally arranged, so that the recycling cycle is long and the cost is increased.

Description

Technical Field

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

[0002] Injection molding is the mainstream process for mass production of plastic parts. Among them, square-shaped open box-type injection molded parts occupy an important position in industrial production and daily life due to their practical structure and wide applicability. They are commonly found in household appliance internal storage compartments, food-grade sealed storage boxes, electronic component turnover boxes, and automotive interior storage compartments. These injection molded parts are often made from general-purpose plastics (such as PP, PE, PS, ABS, etc.) or engineering plastics (such as PC, PMMA, etc.) because both have low property decay under short-term high-temperature melting conditions. They do not require complex crushing and granulation processes; they can be simply shredded and mixed with new materials in a preset ratio for reuse in the injection molding process.

[0003] During injection molding, molten raw material is injected into the cavity formed by the closing of the fixed mold and the moving mold through a cold runner system. During this process, it is cooled and solidified by coolant to form the rough mold of the injection molded part. The cooling efficiency directly affects the production efficiency and the quality of the rough mold.

[0004] Currently, the industry generally uses cooling channels and coolant to accelerate curing and ensure molding efficiency. However, due to objective factors such as channel layout and coolant flow, burrs inevitably occur at the mold closing point of the side plate. Insufficient cooling efficiency will further aggravate the burr phenomenon, resulting in a large amount of sprue material. These sprue materials are usually recycled in a centralized manner, but this recycling method will cause the sprue material to be contaminated by dust, oil and other pollutants during the transfer process. Therefore, additional crushing and cleaning processes are required, resulting in a long recycling cycle and increased recycling costs. Summary of the Invention

[0005] To address the aforementioned shortcomings of existing technologies, this invention provides a reusable mold for molding plastic products. This effectively solves the problem that, in the injection molding of square-shaped open box-type injection molded parts, burrs easily form at the mold closing point due to factors such as the layout of the mold cooling channels and the flow of coolant. Insufficient cooling exacerbates this phenomenon and increases sprue material. Conventional centralized recycling of sprue material makes it susceptible to contamination during transfer, requiring additional crushing and cleaning processes, resulting in long recycling cycles and increased costs.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides a reusable mold for molding plastic products, comprising:

[0008] The cabinet consists of a molding chamber fixedly connected to the right side of the cabinet platform, a molding mold connected to the molding chamber, a demolding mechanism that pushes the molding mold to open and close to achieve molding and demolding, an injection molding mechanism that feeds material into the molding mold on the left side of the cabinet platform, and a recycling mechanism located below the demolding mechanism.

[0009] The molding die includes a fixed mold fixedly connected to the left wall of the molding chamber, a moving mold that is pushed by the demolding mechanism to move left and right in the horizontal direction, and a cooling channel provided inside the fixed mold and the moving mold for the flow of coolant, with the coolant entering from below and exiting from above;

[0010] The recycling mechanism includes a guide frame rotatably connected to the right wall panel of the molding chamber via a mounting base, a pusher connected to the lower end of the moving mold to drive the guide frame to deflect, a receiving bin fixedly connected in the cabinet, a trimming assembly connected in the receiving bin to work with the guide frame to cut off the sprue material at the edge of the rough mold, a crushing box located at the lower end of the receiving bin, and a conveying pipe that transports the crushed material back to the injection molding mechanism for recycling and reuse.

[0011] Furthermore, the demolding mechanism includes a sliding plate slidably connected to the right wall panel of the molding chamber via a guide rod. A demolding seat is slidably connected to the left side of the sliding plate via a push rod. The demolding seat is connected to the moving mold via an ejector assembly and a return spring. The left side of the sliding plate is also fixedly connected to the moving mold via positioning rods arranged along a matrix. The positioning rods penetrate the fixed mold and are slidably connected to it. A columnar seat corresponding to the push rod is fixedly connected to the right wall panel of the molding chamber.

[0012] Furthermore, the ejector assembly includes push rods fixedly connected to the left end of the demolding base and arranged in a diamond pattern. The three push rods located at the bottom are spring rods, and each of the elastic sections is fixedly fitted with a limiting piece. The left end of the push rod slides through and extends into the moving mold, and the length of the uppermost push rod is fixed.

[0013] Furthermore, the guide frame consists of two symmetrical long plates and a connecting plate between the two long plates. Guide grooves are symmetrically opened on the opposite ends of the two long plates. The guide grooves adopt a zigzag design and are composed of interconnected V-shaped segments and horizontal segments. A guide block is fixedly connected to the pusher and slidably disposed in the guide groove.

[0014] Furthermore, the trimming assembly includes a support fixedly connected in the receiving hopper, a top plate fixedly connected to the support by telescopic rods arranged along the matrix, the top plate being driven by a cylinder fixedly connected to the forming hopper, and a cutter fixedly connected to the lower end face. The four cutters are arranged along the matrix and together form a closed rectangular frame, and the width of the two front-to-back symmetrical cutters is greater than the width of the two left-to-right symmetrical cutters.

[0015] Furthermore, guide plates are symmetrically fixedly connected to the upper ends of the two long plates of the guide frame, and the guide plates and connecting plates are provided with cutting grooves corresponding to the cutter.

[0016] Furthermore, the cutter is fixedly connected to a pusher block on the side away from the rectangular frame.

[0017] Furthermore, both long plates of the guide frame are connected to belts via rotatably mounted pulley sets, and the vertical height of the pulley closer to the fixed mold in the pulley set is lower than the vertical height of the pulley farther from the fixed mold. Two shift rods are fixedly connected to the two belts on the left and right sides via lifting lugs.

[0018] Furthermore, a material collection box is fixedly connected to the lower end of the fixed mold.

[0019] The technical solution provided by this invention has the following advantages compared with the prior art:

[0020] 1. This invention adopts a closed recycling process. The sprue material does not come into contact with the external environment from rough die cutting to crushing and recycling. The sprue material cut by the trimming component falls directly into the receiving bin, is crushed in the crushing box, and is directly transported to the injection molding mechanism through the conveying pipe to be mixed with the new material. This not only avoids the pollution risks of dust, oil and other contaminants in traditional recycling, but also solves the problem of moisture absorption and degradation of engineering plastics such as PC and PMMA. No additional cleaning and drying process is required, and the purity of the recycled material and the stability of the mechanical properties and appearance quality of the finished product are guaranteed.

[0021] 2. The recycling mechanism and demolding mechanism of this invention are linked. During the movement of the moving mold, the guide frame is driven to complete the posture switching, realizing automatic demolding of the rough mold, precise feeding, sprue cutting, and automatic separation of the rough mold and sprue. There is no need for manual transfer, sorting and additional processing procedures, which greatly shortens the sprue recycling cycle, reduces the time loss caused by multiple transfers in the traditional recycling mode, and significantly improves the overall production and recycling efficiency.

[0022] 3. In this invention, the demolding mechanism ensures the coaxiality of the moving mold movement through a matrix arrangement of positioning rods. The ejector assembly adopts a differentiated push rod design to achieve smooth demolding of the rough mold and avoid collision damage. The trimming assembly's cutter encloses a rectangular frame, and with the cutting groove and guide plate limit on the guide frame, it can accurately cut the sprue material at the edge of the rough mold, which not only improves the trimming accuracy but also reduces the wear of the rough mold during conveying and processing, ensuring the integrity of the finished product's appearance and dimensional accuracy. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0025] Figure 2 This is an embodiment of the present invention. Figure 1 Front view structural diagram;

[0026] Figure 3 This is a schematic diagram of the molding die and demolding mechanism according to an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the separation structure of the molding die from a first-view perspective according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the separation structure of the molding die from a second perspective in an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the demolding mechanism according to an embodiment of the present invention;

[0030] Figure 7 This is an embodiment of the present invention. Figure 6 A magnified structural diagram of part A in the middle;

[0031] Figure 8 This is a schematic diagram of the moving mold and recycling mechanism according to an embodiment of the present invention;

[0032] Figure 9 This is a schematic diagram of the trimming component according to an embodiment of the present invention;

[0033] Figure 10 This is a schematic diagram of the moving mold and guide frame according to an embodiment of the present invention;

[0034] Figure 11 This is a schematic diagram of the structure of the guide rack state transformation in an embodiment of the present invention.

[0035] The labels in the diagram represent: 1. Cabinet; 2. Molding chamber; 3. Molding mold; 31. Fixed mold; 32. Moving mold; 33. Cooling channel; 4. Demolding mechanism; 41. Guide rod; 42. Moving plate; 43. Support rod; 44. Demolding seat; 45. Pushing assembly; 451. Push rod; 452. Limiting plate; 46. Return spring; 47. Positioning rod; 48. Column base; 5. Injection molding mechanism; 6. Recycling mechanism; 61. Mounting base; 62. Material guide frame; 621. Guide groove; 622. Guide plate; 623. Cutting groove; 63. Pushing component; 631. Guide block; 64. Receiving bin; 65. Trimming assembly; 651. Support; 652. Top plate; 653. Cutter; 654. Push block; 66. Crushing box; 67. Conveying pipe; 68. Moving rod; 69. Collection box. Detailed Implementation

[0036] 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.

[0037] The present invention will be further described below with reference to embodiments.

[0038] Example:

[0039] Please see Figure 1 - Figure 11 The present invention provides a technical solution: a reusable mold for molding plastic products, comprising:

[0040] Cabinet 1, molding chamber 2 fixedly connected to the right side of the cabinet 1 table, molding mold 3 connected to the molding chamber 2, demolding mechanism 4 that pushes the molding mold 3 to open and close to achieve molding and demolding, injection molding mechanism 5 set on the left side of the cabinet 1 table to feed material into the molding mold 3, and recycling mechanism 6 set below the demolding mechanism 4.

[0041] The molding die 3 includes a fixed die 31 fixedly connected to the left wall of the molding chamber 2, a moving die 32 pushed by the demolding mechanism 4 to move left and right in the horizontal direction, and a cooling channel 33 provided inside the fixed die 31 and the moving die 32 for the flow of coolant. The coolant enters from below and exits from above.

[0042] The recycling mechanism 6 includes a guide frame 62 rotatably connected to the right side wall of the molding chamber 2 via a mounting base 61, a pusher 63 connected to the lower end of the moving mold 32 for deflecting the guide frame 62, a receiving chamber 64 fixedly connected to the cabinet 1, a trimming assembly 65 connected to the receiving chamber 64 and working with the guide frame 62 to cut off the sprue material at the edge of the rough mold, a crushing box 66 located at the lower end of the receiving chamber 64, and a conveying pipe 67 for conveying the crushed material back to the injection molding mechanism 5 for recycling and reuse. The lower end of the fixed mold 31 is fixedly connected to a collection box 69.

[0043] Specifically, during the injection molding process, a large amount of sprue material is generated from the direct gate, spot gate, and side gate of the cold runner system. For general-purpose plastics and engineering plastics with excellent chemical stability, the sprue material has a low degree of physical property decay under short-term high-temperature melting conditions. After crushing, it can be directly mixed with new material in proportion for injection molding. This process is in line with the concept of green manufacturing technology and can achieve a dual improvement in environmental and economic benefits.

[0044] However, the current mainstream approach in the industry is still to centrally crush and recycle injection molding materials. This approach has several technical drawbacks: First, during the entire process of transferring the sprue material from the molding equipment to the crushing equipment and then to the injection molding hopper, it is easily contaminated by environmental dust, equipment oil, and impurities from the hands of operators, resulting in a decrease in the purity of the recycled raw materials. Second, the recycling of contaminated and moisture-absorbing sprue material requires additional key processes of cleaning and drying, which not only prolongs the recycling process and increases the complexity of the process, but also consumes a large amount of water and electricity, significantly reducing overall production efficiency.

[0045] To address the aforementioned issues, this invention optimizes and improves the structure of traditional and general-purpose molds. While retaining the traditional coolant cooling scheme, it innovatively adopts a bottom-up flow method for the coolant. The coolant enters from the bottom of the cooling channel 33 and exits from the top, allowing the low-temperature coolant to first contact the high-temperature melt that has just filled the mold. This achieves uniform and continuous heat exchange in the mold cavity, avoiding the problems of insufficient local cooling or coolant short circuits in traditional cooling methods. It can accelerate the solidification and molding of the melt and reduce the amount of sprue material generated in the cold runner system, thereby reducing the pressure of sprue material recycling from the source.

[0046] To achieve timely and efficient recycling of sprue material, this invention provides a recycling mechanism 6 below the demolding mechanism 4. During operation, the moving mold 32 and the fixed mold 31 are in the closed state in the initial state, and the left end of the guide frame 62 is tilted downward. The injection molding mechanism 5 injects molten material into the cavity formed by the closing of the moving mold 32 and the fixed mold 31. After the material fills the cavity, the coolant flows from bottom to top along the cooling channel 33, quickly and evenly carrying away the heat of the cavity, so that the material cools and solidifies rapidly to form a rough mold. Inevitably, some sprue material burrs will be generated at the edge of the rough mold.

[0047] Subsequently, the demolding mechanism 4 pushes the moving mold 32 to move horizontally to the right to open the mold. During this process, the moving mold 32 and the fixed mold 31 gradually separate. When the moving mold 32 moves to the right to the set position, the pusher 63 at its lower end acts synchronously on the guide frame 62, driving the guide frame 62 to rotate around the mounting base 61, so that the left end of the guide frame 62 changes from a downward tilting state to an upward tilting state. At the same time, the rough mold completely separates from the moving mold 32 under its own weight and the guiding action of the moving mold 32, and falls steadily onto the guide frame 62 after the attitude adjustment at a preset tilt angle. It slides uniformly to the right along the tilting surface of the guide frame 62 to the bottom of the trimming component 65. The tilting guide design of the guide frame 62 can avoid the rough mold from being bumped and damaged during the conveying process, ensuring the integrity of the rough mold's appearance.

[0048] As the moving mold 32 continues to move to the right, it drives the guide frame 62 and the rough mold on it to a horizontal state. At this time, the trimming component 65 moves downward to precisely cut the sprue material at the edge of the rough mold. The cut sprue material falls directly into the receiving bin 64 and is then transported from the receiving bin 64 to the crushing box 66 for crushing. The crushed sprue material is then transported to the injection molding mechanism 5 through the conveying pipe 67 according to a preset ratio. After being evenly mixed with the new material, it is reinjected into the cavity of the molding mold 3. This fully enclosed recycling process can effectively avoid pollution and moisture absorption problems caused by the sprue material coming into contact with the external environment. It not only ensures the purity of the recycled material but also eliminates the need for cleaning and drying processes, greatly shortening the recycling cycle and improving production efficiency. At the same time, for hygroscopic engineering plastics such as PC and PMMA, it can also avoid various defects caused by material moisture absorption and ensure the stability of finished product quality.

[0049] When the moving mold 32 moves to the left to reset and close the mold, it will once again drive the guide frame 62 to switch to a downward tilting state on the left, so that the trimmed rough mold slides off the guide frame 62 into the collection box 69, thus separating it from the sprue material.

[0050] The demolding mechanism 4 includes a moving plate 42 slidably connected to the right wall of the molding chamber 2 via a guide rod 41. A demolding seat 44 is slidably connected to the left side of the moving plate 42 via a push rod 43. The demolding seat 44 is connected to the moving mold 32 via a push assembly 45 and a return spring 46. The left side of the moving plate 42 is also fixedly connected to the moving mold 32 via a positioning rod 47 arranged along a matrix. The positioning rod 47 passes through the fixed mold 31 and is slidably connected to it. A columnar seat 48 corresponding to the push rod 43 is fixedly connected to the right wall of the molding chamber 2.

[0051] The ejector assembly 45 includes push rods 451 fixedly connected to the left end of the demolding base 44 and arranged in a diamond shape. The three push rods 451 located at the bottom are spring rods and each of the elastic sections is fixedly fitted with a limiting piece 452. The left end of the push rod 451 slides through and extends into the moving mold 32. The length of the push rod 451 located at the top is fixed.

[0052] Specifically, the right end of the guide rod 41 is connected to an external drive device for driving it to move left and right in the horizontal direction. In the initial state, the moving plate 42 is in a relatively left position. At this time, each push rod 451 is penetrated and fitted into the interior of the moving mold 32, and the axis of the push rod 451 is parallel to the mold surface. The positioning rod 47 not only realizes the fixed connection between the moving plate 42 and the moving mold 32, but its design of penetrating the fixed mold 31 and slidingly engaging with the fixed mold 31 can also ensure the coaxiality and stability of the moving mold 32 when it moves, avoid the offset during mold closing and opening, and ensure the sealing accuracy of the cavity. Then, the positioning rod 47 drives the moving mold 32 and the fixed mold 31 to close precisely.

[0053] After the molten material is injected into the cavity formed by the two and cooled and solidified by the coolant in the cooling channel 33, the external drive device is started. The drive guide rod 41 drives the transfer plate 42 to move to the right in sync. The transfer plate 42 pulls the moving mold 32 and the demolding seat 44 to move to the right together through the positioning rod 47. During the rightward movement of the moving mold 32, the pusher 63 at its lower end acts on the feeding frame in sync, causing the left end of the feeding frame to gradually change from the initial downward tilt state to the upward tilt state, completing the posture adjustment of the feeding frame in advance, and preparing for the subsequent sliding of the rough mold.

[0054] When the demolding seat 44 moves to the right to the set position, the right-side abutment 43 makes precise contact with the column seat 48 on the right side wall of the molding chamber 2. Due to the limiting effect of the column seat 48, the demolding seat 44 cannot continue to move to the right with the moving plate 42, while the moving mold 32 continues to move to the right under the continuous traction of the positioning rod 47. At this time, a relative displacement occurs between the demolding seat 44 and the moving mold 32, and the push rod 451 slides relative to the moving mold 32, thereby pushing the cooled and solidified rough mold to gradually detach from the cavity of the moving mold 32.

[0055] Among them, the three lower push rods 451 adopt a spring rod structure, and the limiting piece 452 fixedly sleeved on their elastic section can achieve precise control of the pushing stroke of the push rod 451. When the rough mold is about to completely detach from the moving mold 32, the limiting piece 452 abuts against the end face of the moving mold 32 and is blocked, the spring rod is compressed and cannot continue to apply pushing force to the rough mold; while the uppermost push rod 451 is designed with a fixed length and is not affected by the limiting piece, and will continue to apply pushing force to the rough mold. Through this differentiated pushing force, in the final stage of demolding, only the upper push rod 451 applies force, which can precisely control the demolding posture of the rough mold, ensuring that the rough mold always falls smoothly into the feeding rack that has been adjusted to be tilted upward on the left end with a specific posture of the protruding end downward, avoiding the deviation of the rough mold posture and subsequent slippage and misalignment.

[0056] Since the left end of the feeding rack is in an upward-curving state at this time, the rough die falling on the feeding rack slides down the inclined surface of the feeding rack at a uniform speed under its own gravity. The inclination angle of the feeding rack is adapted to ensure that the rough die slides down smoothly and avoids damage to the surface of the rough die caused by excessive sliding speed. Finally, the rough die slides accurately to the right end of the feeding rack, that is, directly below the trimming component 65. The moving die 32 continues to move to the right, and the pusher 63 at its lower end continues to act on the feeding rack, driving the feeding rack to rotate further around the mounting base 61 until it is adjusted to a horizontal state. The horizontal placement of the feeding rack can keep the rough die in a stable position, avoid shaking or deviation during the trimming process, effectively improve the trimming accuracy, and at the same time facilitate the smooth falling of the sprue material generated by trimming into the receiving bin 64 below, realizing the coordinated connection between trimming and recycling, and further improving the continuity of production.

[0057] The guide frame 62 consists of two long plates arranged symmetrically front and back, and a connecting plate fixedly connected between the two long plates. Guide grooves 621 are symmetrically opened on the opposite end faces of the two long plates. The guide grooves 621 adopt a zigzag structure design, which consists of V-shaped segments and horizontal segments that are smoothly connected to each other. A guide block 631 is fixedly connected to the pusher 63 and slidably embedded in the guide groove 621. The precise sliding cooperation between the guide block 631 and the guide groove 621 can ensure that the posture adjustment of the guide frame 62 is stable and without deviation, thus improving the reliability of the linkage.

[0058] The trimming assembly 65 includes a support 651 fixedly connected inside the receiving chamber 64. A top plate 652 is fixedly connected to the support 651 via telescopic rods arranged in a matrix. The telescopic rods serve as guides and limiters to prevent the top plate 652 from tilting or shifting when moving up and down. The top plate 652 is driven to rise and fall by a cylinder fixedly connected to the forming chamber 2. A cutter 653 is fixedly connected to its lower end face. Four cutters 653 are arranged in a matrix and together form a closed rectangular cutting frame. The width of the cutters 653 arranged symmetrically at the front and back is greater than that of the cutters 653 arranged symmetrically at the left and right.

[0059] The upper ends of the two long plates of the guide frame 62 are symmetrically fixed with guide plates 622. The guide plates 622 have an inclined guiding structure. Both the guide plates 622 and the connecting plates are provided with cutting grooves 623 that correspond one-to-one with the cutter 653. The cutting grooves 623 can provide clearance space for the cutter 653, avoid interference between the cutter 653 and the guide frame 62 when cutting, and at the same time ensure that the sprue material can fall smoothly after cutting.

[0060] A pusher block 654 is fixedly connected to the side of the cutter 653 away from the rectangular cutting frame, which can push the sprue material off in time after cutting to prevent it from sticking and remaining. Both long plates of the guide frame 62 are connected to belts by a pulley group that is rotatably mounted. The pulley on the side closer to the fixed mold 31 is lower in vertical height than the pulley on the side away from the fixed mold 31, so that the belt is arranged at an angle. Two moving rods 68 are symmetrically fixedly connected between the two belts by lifting lugs. The moving rods 68 can slide along the inclined direction with the belt to realize the auxiliary pushing and resetting of the rough mold.

[0061] Specifically, when the moving mold 32 and the fixed mold 31 are in the mold closing state, the guide block 631 is located at the leftmost end of the V-shaped section of the guide groove 621. Under the limiting action of the guide groove 621, the guide frame 62 maintains the initial posture of the left end tilting downward. At this time, due to the gravity of the shift rod 68, the left shift rod 68 slides to the lowest point of the belt, realizing the initial reset.

[0062] When the moving mold 32 moves to the right under the drive of the demolding mechanism 4, the pusher 63 synchronously drives the guide block 631 to move horizontally to the right with the moving mold 32. Since the vertical height of the guide block 631 remains unchanged, during the process of sliding from the leftmost end to the lowest point in the V-shaped section of the guide groove 621, it will drive the guide frame 62 to gradually deflect around the mounting base 61, first tilting downward from the left end to the horizontal state, and then continuing to deflect until it tilts upward from the left end.

[0063] As the guide frame 62 tilts upwards to the left, the coarse die, under the differentiated thrust of the push rod 451, smoothly falls between the two long plates in a preset posture with its protruding end facing downwards. On the one hand, it slides naturally to the right under the tilting guidance of the guide frame 62, and on the other hand, the shift rod 68 slides to the right along the inclined belt under its own gravity. The right shift rod 68 is located on the right side of the coarse die and does not contact the coarse die to avoid interfering with its sliding. The left shift rod 68, while sliding to the right with the belt, contacts the left side of the coarse die and assists in pushing the coarse die between the two guide plates 622. The guide plates 622 precisely limit the coarse die from the front and back direction, and the connecting plate positions the coarse die from the right end. The three work together to ensure that the coarse die is accurately aligned with the trimming component 65, providing a guarantee for subsequent cutting operations. At the same time, the guiding effect of the guide plates 622 can prevent the coarse die from shifting back and forth during sliding, protecting the surface of the coarse die from scratches.

[0064] Then, as the moving mold 32 continues to move to the right, the guide block 631 slides into the horizontal section of the guide groove 621, and the guide frame 62 synchronously switches to a horizontal state and remains stable. At this time, although the height of the right-side moving rod 68 is higher than that of the left-side moving rod 68, the height difference between the two is small and insufficient to overcome the frictional resistance between the pulley and the belt. The moving rod 68 remains stationary to ensure that the coarse mold is stable in posture during the cutting process and improve the trimming accuracy.

[0065] Then the cylinder starts, driving the top plate 652 to move downwards. The top plate 652 drives the cutter 653 to move downwards simultaneously. Since the width of the front and rear cutters 653 is greater than that of the left and right cutters 653, the wider front and rear cutters 653 first contact the sprue burrs at the edge of the rough mold, completing the horizontal cutting of the sprue burrs. After cutting, the cutter 653 continues to move downwards, and the pusher block 654 on one side simultaneously pushes the cut sprue burrs downwards into the receiving bin 64 to prevent the sprue burrs from sticking to the cutter 653 or the surface of the rough mold. Then the narrower left and right cutters 653 contact the remaining sprue burrs and complete the cutting. The pusher block 654 simultaneously pushes the corresponding sprue burrs into the receiving bin 64. This differentiated cutting sequence can avoid interference between sprue burrs, ensuring thorough cutting. At the same time, the setting of the pusher block 654 eliminates the process of manually cleaning sprue burrs, improving production continuity.

[0066] After cutting, the cylinder drives the top plate 652 to reset upwards, and the telescopic rod resets simultaneously and acts as a guide to ensure the accurate reset of the top plate 652 and avoid interference with other components. Subsequently, the moving mold 32 moves to the left to reset, and the pusher 63 drives the guide block 631 to slide in the opposite direction along the guide groove 621. The guide frame 62 resets to the left simultaneously. During the reset process, the height difference of the pulley group increases again. The weight of the moving rod 68 overcomes the frictional resistance between the pulley and the belt. The right moving rod 68 slides down along the inclined belt, simultaneously pushing the cut rough mold down along the guide frame 62. When the left moving rod 68 resets to the lowest point of the belt, it does not contact the bottom of the rough mold due to the height difference, thus avoiding obstructing the rough mold's descent. This ensures that the rough mold can smoothly slide down along the guide frame 62 into the collection box 69, realizing the automatic separation of the sprue and the rough mold without manual sorting, greatly improving production efficiency. At the same time, the fully enclosed operation process can prevent the rough mold and sprue from being contaminated, ensuring the quality of the finished product and conforming to the concepts of green manufacturing and automated production.

[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 reusable mold for molding plastic products, characterized in that, include: Cabinet (1), molding chamber (2) fixedly connected to the right side of the cabinet (1) table, molding mold (3) connected to the molding chamber (2), demolding mechanism (4) for pushing the molding mold (3) to open and close, injection molding mechanism (5) set on the left side of the cabinet (1) table for feeding material into the molding mold (3), and recycling mechanism (6) set below the demolding mechanism (4). The molding die (3) includes a fixed die (31) fixedly connected to the left wall of the molding chamber (2), a moving die (32) driven by the demolding mechanism (4) to move left and right in the horizontal direction, and a cooling channel (33) provided inside the fixed die (31) and the moving die (32) for the flow of coolant. The coolant enters from the bottom of the cooling channel (33) and exits from the top. The recycling mechanism (6) includes a guide frame (62) rotatably connected to the right side wall of the molding chamber (2) via a mounting base (61), a pusher (63) connected to the lower end of the moving mold (32) for pushing the guide frame (62) to rotate, a receiving chamber (64) fixedly connected to the cabinet (1), a trimming assembly (65) connected to the receiving chamber (64) and working with the guide frame (62) to cut off the sprue material at the edge of the rough mold, a crushing box (66) set at the lower end of the receiving chamber (64), and a conveying pipe (67) for conveying the crushed material back to the injection molding mechanism (5) for recycling and reuse. The guide frame (62) consists of two long plates symmetrically arranged in front and back and a connecting plate connecting the two long plates. Guide grooves (621) are symmetrically arranged on the end faces of the two long plates that are far apart from each other. The guide grooves (621) adopt a zigzag design and are composed of interconnected V-shaped segments and horizontal segments. The pusher (63) is fixedly connected to a guide block (631) that is slidably arranged in the guide grooves (621).

2. A reusable mold for molding plastic products according to claim 1, characterized in that: The demolding mechanism (4) includes a sliding plate (42) slidably connected to the right wall of the molding chamber (2) via a guide rod (41). A demolding seat (44) is slidably connected to the left side of the sliding plate (42) via a push rod (43). The demolding seat (44) is connected to the moving mold (32) via a push assembly (45) and a return spring (46). The left side of the sliding plate (42) is also fixedly connected to the moving mold (32) via a positioning rod (47) arranged along the matrix. The positioning rod (47) passes through the fixed mold (31) and is slidably connected to it. A columnar seat (48) corresponding to the push rod (43) is fixedly connected to the right wall of the molding chamber (2).

3. A reusable mold for molding plastic products according to claim 2, characterized in that: The push assembly (45) includes push rods (451) fixedly connected to the left end of the demolding base (44) and arranged in a diamond shape. The three push rods (451) located at the bottom are spring rods and each of the elastic sections is fixedly fitted with a limiting piece (452). The left end of the push rod (451) slides through and extends into the moving mold (32). The length of the push rod (451) located at the top is fixed.

4. A reusable mold for molding plastic products according to claim 1, characterized in that: The trimming assembly (65) includes a support (651) fixedly connected in the receiving bin (64). A top plate (652) is fixedly connected to the support (651) by telescopic rods arranged along the matrix. The top plate (652) is driven by a cylinder fixedly connected to the forming bin (2). A cutter (653) is fixedly connected to the lower end face. The four cutters (653) are arranged along the matrix to form a closed rectangular frame. The width of the two cutters (653) that are symmetrical in front and behind is greater than the width of the two cutters (653) that are symmetrical in the left and right.

5. A reusable mold for molding plastic products according to claim 4, characterized in that: The upper ends of the two long plates of the guide frame (62) are symmetrically fixed with guide plates (622), and the guide plates (622) and the connecting plates are provided with cutting grooves (623) corresponding to the cutter (653).

6. A reusable mold for molding plastic products according to claim 5, characterized in that: The cutter (653) has a pusher (654) fixedly connected to the side away from the rectangular frame.

7. A reusable mold for molding plastic products according to claim 1, characterized in that: The guide frame (62) has belts connected to the two long plates by a rotating pulley group. The vertical height of the pulley closer to the fixed mold (31) is lower than that of the pulley farther from the fixed mold (31). Two moving rods (68) are fixedly connected to the two belts by lifting lugs.

8. A reusable mold for molding plastic products according to claim 1, characterized in that: The lower end of the fixed mold (31) is fixedly connected to the collection box (69).

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