A TPU protective case injection mold

Abstract

This invention discloses an injection mold for TPU protective sleeves, belonging to the field of mold technology. It includes a fixed mold with a lower mold core embedded in its top, a temperature control cavity I at the bottom of the lower mold core, and an operating cavity inside the fixed mold; and a moving mold with an upper mold core embedded in its bottom, and a temperature control cavity II connected to the temperature control cavity I at its top. Compared to commonly available TPU protective sleeve injection molds, this product uses a combination of air cooling and water cooling. It cools the upper and lower mold cores with dehumidified, low-temperature air, avoiding the possibility of steam explosions. The insulation cavity houses and insulates the preheated heating plate. During cooling, only the lower and upper mold cores are cooled, without needing to cool the heating plate itself. This allows for rapid temperature increases in the heating plate upon reuse, quickly preheating the lower and upper mold cores, ensuring processing efficiency while saving heating energy, resulting in economic benefits and broad application prospects.

Description

Technical Field

[0001] This invention relates to the field of mold technology, specifically to an injection mold for a TPU protective sleeve. Background Technology

[0002] Thermoplastic polyurethane elastomer, also known as thermoplastic polyurethane rubber, or TPU for short, is an (AB)n-type block linear polymer. TPU rubber is cross-linked by intermolecular hydrogen bonds or by mild cross-linking between macromolecular chains. These two cross-linking structures are reversible as the temperature rises or falls. In the molten or solution state, the intermolecular forces weaken, but after cooling or solvent evaporation, strong intermolecular forces re-bond them, restoring their original solid properties. TPU protective cases are electronic product protective cases made of TPU material, such as TPU phone cases and iPad TPU protective cases.

[0003] TPU protective sleeves are generally manufactured using injection molding. Molten TPU is injected into a mold, and after the mold cools, the protective sleeve can be removed. Mold cooling methods generally include air cooling and water cooling. Water cooling can cause steam explosions when the mold temperature is too high, placing strict requirements on mold specifications and water cooling structures. Therefore, air cooling is more commonly used. However, compared to water cooling, air cooling is less efficient, and the mold needs to be preheated by built-in heating elements before injecting the molten material to achieve better molding results. This means that air cooling requires cooling the mold before cooling the product, and when used again, the mold needs to be preheated by heating elements again, resulting in significant heat loss and high energy consumption, which seriously affects the molding efficiency of TPU protective sleeves. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: an injection mold for a TPU protective sleeve, comprising:

[0005] A fixed mold, wherein a lower mold core is embedded at the top of the fixed mold, a temperature control cavity is formed at the bottom of the lower mold core, and an operating cavity is formed inside the fixed mold;

[0006] The moving mold has an upper mold core embedded at its bottom and a second temperature control cavity connected to the first temperature control cavity at its top.

[0007] The heat preservation cavity includes two, which are respectively opened inside the fixed mold and the moving mold and are respectively opposite to the temperature control cavity one and the temperature control cavity two. The heat preservation cavity is provided with an electric push rod and a heating plate located on the output end of the electric push rod for heating the temperature control cavity one and the temperature control cavity two. A heat insulation cylinder is provided at the bottom of the heating plate located in the fixed mold.

[0008] The air-cooling mechanism is used to cool the temperature control chamber one and the temperature control chamber two. The air-cooling mechanism includes a fan installed inside the operating chamber and an air guide frame fixedly installed on the top of the inner wall of the operating chamber. The air guide frame is used to connect the fan and the heat insulation cylinder. A demister is installed inside the air guide frame.

[0009] A partition mechanism is used to separate the heat insulation cavity from the temperature control cavity one and the temperature control cavity two. The partition mechanism includes a heat insulation plate one and a heat insulation plate two respectively disposed inside the two heat insulation cavities. There are two heat insulation plates one and two heat insulation plates two in each case, and they are one-to-one opposite each other. The heat insulation plate one has an air outlet hole that is coaxially arranged with the heat insulation cylinder to connect the heat insulation cylinder and the temperature control cavity one, so that the air blown by the fan can be delivered to the interior of the temperature control cavity one.

[0010] A water tank is used to cool the air drawn by the fan. The water tank is located inside the operating chamber. At least one thin-walled copper tube is fixedly installed inside the water tank. Cooling holes connected to the thin-walled copper tube are opened at the top and bottom of the water tank to connect the thin-walled copper tube and the fan.

[0011] As a preferred embodiment of the present invention, the demister is provided with at least one demister arc plate inside, and at least one moisture-absorbing silica gel is provided on both sides of the demister arc plate. The top of the fan is provided with a baffle that is engaged with the air guide frame by a spring. The top of the baffle abuts against the bottom of the demister. Pressing down the baffle disengages it from the demister, so that the demister falls under the influence of gravity.

[0012] As a preferred embodiment of the present invention, an air outlet is provided on one side of the inner wall of the temperature control cavity one, an air inlet is provided on one side of the inner wall of the temperature control cavity two, which is connected to the air outlet one, and an exhaust hole is provided on the other side of the inner wall of the temperature control cavity two, which extends to one side of the moving mold. The moving mold is provided with a gating system that is connected to the lower mold core and the upper mold core.

[0013] As a preferred embodiment of the present invention, the heat insulation cylinder includes a heat insulation inner cylinder fixedly disposed inside the heat insulation cavity and a heat insulation outer cylinder movably sleeved on the heat insulation inner cylinder. The top of the heat insulation outer cylinder is fixedly connected to the bottom of the heating plate. A magnetic plate is disposed on the output end of the electric push rod. The heat insulation plate is adsorbed on the magnetic plate. The side of the heat insulation plate away from the magnetic plate is fixedly connected to the heating plate. A toothed plate is disposed on the magnetic plate located inside the fixed mold.

[0014] As a preferred embodiment of the present invention, an air supply pipe is movably arranged inside the heat-insulating inner cylinder by means of a spring. The top end of the air supply pipe extends to the outside of the heat-insulating inner cylinder and abuts against the heat insulation plate. A sealing gasket is provided between the bottom of the air supply pipe and the heat-insulating inner cylinder, and a sealing gasket is provided between the outside of the air supply pipe and the top of the heat-insulating inner cylinder.

[0015] As a preferred embodiment of the present invention, the partition mechanism further includes an opening and closing motor for driving the first insulation board and the second insulation board. The output end of the opening and closing motor is provided with a gear, and both ends of the two first insulation boards are provided with movable rods. The two movable rods located on the same side are staggered and are both L-shaped. The gear on the output end of the opening and closing motor extends between the two staggered movable rods, and the two movable rods are provided with tooth grooves that mesh with the gear, so that when the opening and closing motor is started to rotate in both directions, the gear drives the two first insulation boards to move towards each other or away from each other.

[0016] As a preferred embodiment of the present invention, a linkage rod 1 is fixedly provided at the top of the movable rod, and a conical groove is provided at the top of the linkage rod 1. Linkage rods 2 are provided at both ends of the two insulation plates 1. The two linkage rods 2 located on the same side are staggered. The bottom end of the linkage rod 2 is conical and extends into the interior of the conical groove, so that when the movable rod moves, the linkage rod 1 drives the linkage rod 2 to move synchronously, thereby realizing the linkage between the insulation plates 1 and 2.

[0017] As a preferred embodiment of the present invention, the bottom opening of the air outlet is provided with an arc groove that engages with the top of the air supply pipe, and guide grooves are provided at the bottom of the opposite ends of the two insulation plates. Sealing plates are embedded at the top and bottom of the insulation plates and the insulation plate. A pad is provided inside the operating cavity by means of a spring. The two ends of the pad are arc-shaped, and a guide post with its bottom end penetrating into the mold is provided at the bottom of the pad.

[0018] As a preferred embodiment of the present invention, a stirring shaft is movably arranged inside the water tank, and stirring blades are provided on the stirring shaft for stirring the water inside the water tank when the stirring shaft rotates. The top end of the stirring shaft passes through the bottom plate and extends to the top of the bottom plate. The top of the water tank is also provided with positioning posts located on both sides of the stirring shaft, and the top end of the positioning posts extends into the interior of the bottom plate. The top end of the stirring shaft is a quadrilateral pyramid.

[0019] As a preferred embodiment of the present invention, it further includes a transmission component, which includes a first transmission shaft, a second transmission shaft, and a protective cover. The first transmission shaft is longitudinally rotatably disposed inside the protective cover, and the second transmission shaft is laterally rotatably disposed inside the protective cover. The opposite ends of the first and second transmission shafts mesh with each other through bevel gears. The bottom end of the first transmission shaft extends through to the outside of the protective cover and is sleeved with the top of the stirring shaft. One end of the second transmission shaft is provided with a gear shaft, and the bottom end of the gear plate extends through to the inside of the protective cover and meshes with the gear shaft.

[0020] Compared with the prior art, the present invention provides an injection mold for TPU protective sleeves, which has the following beneficial effects:

[0021] 1. Compared to common TPU protective sleeve injection molds on the market, this product uses a combination of air cooling and water cooling. It cools the upper and lower mold cores with dehumidified, low-temperature air, preventing steam explosions. The insulation chamber houses and insulates the preheated heating plate. During cooling, only the lower and upper mold cores are cooled, eliminating the need to cool the heating plate itself. This allows for rapid temperature increases in the heating plate upon reuse, quickly preheating the lower and upper mold cores, ensuring processing efficiency while saving heating energy. This results in economic benefits and broad application prospects.

[0022] 2. The TPU protective sleeve uses an injection mold. The second insulation plate inside the moving mold is driven by the first insulation plate inside the fixed mold. There is no need to install an opening and closing motor inside the moving mold, which reduces manufacturing and usage costs. The first and second insulation plates have high linkage. After the fixed mold and the moving mold are closed, they automatically connect and will not affect the demolding of the fixed mold and the moving mold.

[0023] 3. This TPU protective sleeve uses an injection mold. When the electric push rod drives the heating plate to move between the temperature control chamber one, the temperature control chamber two, and the insulation chamber, it simultaneously drives the toothed plate to drive the stirring shaft to rotate through the transmission component. The stirring shaft drives the stirring blades to rotate and agitate the water flow, so that the water around the thin-walled copper tube inside the water tank exchanges with the water in other parts that are at a lower temperature. This ensures the cooling efficiency of the thin-walled copper tube to the air. Therefore, every time an injection molding process is performed, the stirring shaft will drive the water inside the water tank to agitate, further ensuring the cooling efficiency of the thin-walled copper tube to the air. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an injection mold for a TPU protective sleeve proposed in this invention;

[0025] Figure 2 This is a schematic diagram of the moving mold structure of an injection mold for a TPU protective sleeve proposed in this invention;

[0026] Figure 3This is a cross-sectional view of the structure of an injection mold for a TPU protective sleeve proposed in this invention;

[0027] Figure 4 for Figure 3 Enlarged view of the structure at point A in the middle;

[0028] Figure 5 for Figure 3 Enlarged view of the structure at point B;

[0029] Figure 6 for Figure 3 Enlarged view of the structure at point C;

[0030] Figure 7 This is a cross-sectional view of the air guide frame structure of an injection mold for a TPU protective sleeve proposed in this invention;

[0031] Figure 8 This is a cross-sectional view of the heat insulation cylinder structure of an injection mold for a TPU protective sleeve proposed in this invention;

[0032] Figure 9 This is a side view of the movable rod structure of an injection mold for a TPU protective sleeve proposed in this invention.

[0033] In the diagram: 1. Fixed mold; 11. Lower mold core; 12. Temperature control chamber one; 13. Vent; 14. Operating chamber; 15. Pad; 16. Guide pillar; 2. Moving mold; 21. Upper mold core; 22. Temperature control chamber two; 23. Sprue; 24. Air inlet; 25. Vent; 3. Insulation chamber; 31. Electric push rod; 311. Magnetic plate; 312. Heat insulation plate; 32. Heating plate; 33. Heat insulation cylinder; 331. Heat insulation inner cylinder; 332. Heat insulation outer cylinder; 34. Toothed plate; 35. Air supply pipe; 36. Sealing gasket one; 37. Sealing gasket two; 4. Air cooling mechanism; 41 42. Fan; 43. Air guide frame; 44. Enclosure; 45. Demister; 46. Demister arc plate; 47. Moisture-absorbing silica gel; 58. Base plate; 59. Partition mechanism; 50. Insulation board one; 51. Insulation board two; 52. Air outlet; 53. Movable rod; 54. Opening and closing motor; 55. Linkage rod one; 56. Linkage rod two; 57. Guide groove; 58. Sealing plate; 69. Water tank; 60. Thin-walled copper pipe; 61. Cooling hole; 62. Stirring shaft; 63. Stirring blade; 74. Transmission components; 75. Transmission shaft one; 76. Transmission shaft two; 77. Gear shaft; 78. Protective cover. Detailed Implementation

[0034] 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 embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Please see Figure 1-9 A TPU protective sleeve injection mold includes a fixed mold 1, a lower mold core 11 is embedded in the top of the fixed mold 1, a temperature control cavity 12 is opened at the bottom of the lower mold core 11, and an operating cavity 14 is opened inside the fixed mold 1.

[0036] The moving mold 2 has an upper mold core 21 embedded at its bottom, and a second temperature control cavity 22 connected to the first temperature control cavity 12 is opened at the top of the upper mold core 21.

[0037] The heat preservation cavity 3 includes two, which are respectively opened inside the fixed mold 1 and the moving mold 2 and are respectively opposite to the temperature control cavity 12 and the temperature control cavity 22. The heat preservation cavity 3 is provided with an electric push rod 31 and a heating plate 32 located on the output end of the electric push rod 31 for heating the temperature control cavity 12 and the temperature control cavity 22. The bottom of the heating plate 32 located in the fixed mold 1 is provided with a heat insulation cylinder 33.

[0038] The air-cooling mechanism 4 is used to cool the temperature control chamber 12 and the temperature control chamber 22. The air-cooling mechanism 4 includes a fan 41 disposed inside the operating chamber 14 and an air guide frame 42 fixedly installed on the top of the inner wall of the operating chamber 14. The air guide frame 42 is used to connect the fan 41 and the heat insulation cylinder 33. A demister 44 is disposed inside the air guide frame 42.

[0039] The partition mechanism 5 is used to separate the heat insulation cavity 3 from the temperature control cavity 12 and the temperature control cavity 22. The partition mechanism 5 includes a heat insulation plate 51 and a heat insulation plate 52 respectively disposed inside the two heat insulation cavities 3. There are two heat insulation plates 51 and two heat insulation plates 52, and they are all opposite each other. The heat insulation plate 51 has an air outlet 53 that is coaxially arranged with the heat insulation cylinder 33, which is used to connect the heat insulation cylinder 33 and the temperature control cavity 12 so that the air blown by the fan 41 can be delivered to the interior of the temperature control cavity 12.

[0040] Water tank 6 is used to cool the air drawn by the fan 41. Water tank 6 is located inside the operating chamber 14. At least one thin-walled copper tube 61 is fixedly installed inside water tank 6. Cooling holes 62 connected to the thin-walled copper tube 61 are opened at the top and bottom of water tank 6 to connect the thin-walled copper tube 61 and the fan 41. Water tank 6, insulation board 1 51 and insulation board 2 52 are all made of conventional thermos cup materials. After adding ice cubes and ice water, the temperature is lost only through the thin-walled copper tube 61, so water tank 6 can keep cold for a long time.

[0041] As a specific technical solution in this embodiment, the demister 44 is internally provided with at least one demisting arc plate 45, and at least one moisture-absorbing silica gel 46 is provided on both sides of the demisting arc plate 45. The top of the fan 41 is provided with a baffle 43 that is engaged with the air guide frame 42 by a spring. The top of the baffle 43 abuts against the bottom of the demister 44. Pressing down the baffle 43 disengages it from the demister 44, allowing the demister 44 to descend under gravity. In use, hot water and ice are first heated inside the water tank 6, and the heat in the air... The amount of moisture is absorbed, and the absorption of water vapor in the air can significantly lower the air temperature. When room temperature air enters the thin-walled copper tube 61, the temperature of the ice water inside the water tank 6 is directly conducted to the thin-walled copper tube 61, causing the temperature of the room temperature air to drop significantly. When the temperature of the ice water inside the water tank 6 is low, frost and condensation will adhere to the thin-walled copper tube 61, further absorbing the temperature of the air. The moisture in the air is then eliminated by the demister 44, leaving only low-temperature air to enter the temperature control chamber 12 and temperature control chamber 22. (See reference...) Figure 7 Multiple moisture-absorbing silica gel particles 46 are arranged on both sides of the defogging arc plate 45 to increase the contact area with air, effectively absorbing moisture from the air and further ensuring dehumidification efficiency. (See further...) Figure 7 When the enclosure 43 is pressed down to compress the spring, the enclosure 43 disengages from the clip of the air guide frame 42, and the dehumidifier drops due to its own weight, making it easier for users to replace and facilitating later maintenance, making it more convenient to use.

[0042] As a specific technical solution of this embodiment, an air outlet 13 is provided on one side of the inner wall of the temperature control cavity 12, and an air inlet 24 connected to the air outlet 13 is provided on one side of the inner wall of the temperature control cavity 22. An exhaust port 25 extending to one side of the moving mold 2 is provided on the other side of the inner wall of the temperature control cavity 22. The moving mold 2 is provided with a sprue 23 connected to the lower mold core 11 and the upper mold core 21. After the air enters the interior of the temperature control cavity 12, it first cools the temperature control cavity 12. Finally, the air enters the interior of the air inlet 24 through the air outlet 13, and then enters the interior of the temperature control cavity 22 through the air inlet 24 to cool the interior of the temperature control cavity 22. Finally, the air is discharged through the exhaust port 25. The sprue 23 is used to pour molten material into the space between the lower mold core 11 and the upper mold core 21.

[0043] As a specific technical solution in this embodiment, the heat insulation cylinder 33 includes a heat insulation inner cylinder 331 fixedly disposed inside the heat insulation cavity 3 and a heat insulation outer cylinder 332 movably sleeved on the heat insulation inner cylinder 331. The top of the heat insulation outer cylinder 332 is fixedly connected to the bottom of the heating plate 32. A magnetic plate 311 is provided on the output end of the electric push rod 31. A heat insulation plate 312 is adsorbed on the magnetic plate 311. The side of the heat insulation plate 312 away from the magnetic plate 311 is fixedly connected to the heating plate 32. A toothed plate 34 is provided on the magnetic plate 311 located inside the fixed mold 1. The heat insulation cylinder 33 is made of conventional thermos cup material, which can effectively insulate the heat inside the heat insulation cavity 3 and avoid heating the air passing through the heat insulation inner cylinder 331. The dehumidified air enters the heat insulation inner cylinder 331 through the air guide frame 42 and is insulated. After double-layer insulation by the inner heating cylinder 331 and the outer heat-insulating cylinder 332, the gas enters the interior of the gas supply pipe 35. The magnetic plate 311 is set up to attract the heat insulation plate 312, which facilitates the replacement of the heating plate 32. When the operator removes the lower mold core 11 and the upper mold core 21 and replaces the upper mold core 21 and the lower mold core 11 with different specifications, the specifications of the heating plate 32 also need to be changed. Simply pull the heating plate 32 to drive the heat insulation plate 312 to detach from the magnetic plate 311. The magnetic plate 311 is square, which ensures the stability of the heating plate 32 after connection. The specifications of different models of electronic products only change slightly, and there is no need to adjust the heat insulation cylinder 33. The replaced heating plate 32 only needs to be slightly adjusted in length and width, while other aspects remain unchanged, which further ensures the usability of the product and can be adapted to upper mold cores 21 and lower mold cores 11 with different specifications.

[0044] As a specific technical solution in this embodiment, an air supply pipe 35 is movably installed inside the heat-insulating inner cylinder 331 via a spring. The top end of the air supply pipe 35 extends to the outside of the heat-insulating inner cylinder 331 and abuts against the insulation plate 51. A sealing gasket 36 is provided between the bottom of the air supply pipe 35 and the heat-insulating inner cylinder 331, and a sealing gasket 37 is provided between the outside of the air supply pipe 35 and the top of the heat-insulating inner cylinder 331. The bottom opening of the air outlet 53 is provided with an arc groove that engages with the top of the air supply pipe 35. Guide grooves 58 are provided at the bottom of the opposite ends of the two insulation plates 51. Sealing plates 59 are embedded at the top and bottom of the insulation plates 51 and 52. The damping force of insulation board 51 and insulation board 52 when sliding with insulation cavity 3 is increased, which not only increases the heat insulation effect of insulation board 51 and insulation board 52, but also ensures that insulation board 52 can maintain good stability and will not deviate after being disconnected from insulation board 51. After mold closing, it can smoothly dock with insulation board 51. The inside of the operating cavity 14 is provided with a pad 15 by a spring. The two ends of the pad 15 are arc-shaped. The bottom of the pad 15 is provided with a guide post 16 that extends into the fixed mold 1. The air supply pipe 35 is used to dock with insulation board 51. The top of the air supply pipe 35 is arc-shaped and fits into the arc groove at the bottom of the air outlet 53. The air supply pipe 35 is continuously connected by a spring. The insulation plate 51 abuts against the air supply pipe 35, preventing leakage when air enters the air outlet 53. Air can directly enter the temperature control chamber 12 through the air outlet 53. Both sealing gaskets 36 and 37 are made of high-temperature resistant rubber. To ensure the seal between the air supply pipe 35 and the heat-insulating inner cylinder 331, and to further isolate the heat inside the insulation chamber 3, when the two insulation plates 51 move in opposite directions, the arc grooves on the insulation plates 51 abut against the air supply pipe 35 and disengage from it. To prevent the top of the air supply pipe 35 from abutting against the two insulation plates 51 when they move towards each other, guide grooves 58 are provided at the opposite ends of the two insulation plates 51. The insulation plates 51 abut against the air supply pipe 35 through the guide grooves 58. There will be no jamming when touching the air supply pipe 35; it will only press the air supply pipe 35 down. When the air supply pipe 35 comes into contact with the arc groove, the air supply pipe 35 will rebound and lock the arc groove through the spring, so that the air outlet 53 and the heat insulation cylinder 33 are coaxially opposite, and the air is delivered smoothly. The arc shape on both sides of the pad 15 makes it easy to insert the water tank 6 into the bottom of the base plate 47. When assembling the water tank 6, first use the water tank 6 to touch the pad 15 and press down the pad 15. When the stirring shaft 63 and the positioning post are aligned with the through hole on the base plate 47, release the water tank 6. The pad 15 is rebounded by the spring and lifts the water tank 6, so that the stirring shaft 63 and the positioning post pass through the base plate 47, so that the stirring shaft 63 can be smoothly connected to the drive shaft 71. This design makes it easy to replace the water tank 6 later.

[0045] As a specific technical solution in this embodiment, the partition mechanism 5 further includes an opening and closing motor 55 for driving the insulation board 1 51 and the insulation board 2 52. The output end of the opening and closing motor 55 is provided with a gear. Both ends of the two insulation boards 1 51 are provided with movable rods 54. The two movable rods 54 located on the same side are staggered and both are L-shaped. The gear on the output end of the opening and closing motor 55 extends between the two staggered movable rods 54, and the two movable rods 54 are provided with toothed grooves that mesh with the gear. When the opening and closing motor 55 is started in forward and reverse rotation, the gear drives the two insulation boards 1 51 to move towards or away from each other. Starting the opening motor drives the gear to rotate. (See reference...) Figure 4 and Figure 9 When the gear rotates, it drives the two movable rods 54 on the same side to move. According to the forward and reverse rotation of the opening and closing motor 55, the two movable rods 54 are controlled to move towards each other and away from each other.

[0046] As a specific technical solution in this embodiment, a linkage rod 56 is fixedly provided at the top of the movable rod 54. A conical groove is formed at the top of the linkage rod 56. Linkage rods 57 are provided at both ends of the two insulation boards 51. The two linkage rods 57 located on the same side are staggered. The bottom end of each linkage rod 57 is conical and extends into the conical groove. This allows the linkage rods 57 to move synchronously via the linkage rod 56 when the movable rod 54 moves, thereby achieving linkage between the insulation boards 51 and 52. When the movable rod 54 moves, it... The movement of the first linkage rod 56, through the tapered groove at the top of the first linkage rod 56 and the tapered engagement at the bottom of the second linkage rod 57, allows the connection between the first linkage rod 56 and the second linkage rod 57 to be completed when the moving mold 2 and the fixed mold 1 are relatively closed. When the first linkage rod 56 moves with the movable rod 54, the first linkage rod 56 drives the second linkage rod 57 to move synchronously, so that when the two insulation plates 51 open and close, the two insulation plates 52 open and close synchronously. There is no need to set the opening and closing motor 55 inside the moving mold 2, which reduces manufacturing and usage costs, and does not affect the demolding and closing of the moving mold 2 and the fixed mold 1.

[0047] As a specific technical solution in this embodiment, a stirring shaft 63 is movably installed inside the water tank 6. The stirring shaft 63 is equipped with stirring blades 64, which are used to agitate the water inside the water tank 6 when the stirring shaft 63 rotates. The top end of the stirring shaft 63 penetrates through the bottom plate 47 and extends to the top of the bottom plate 47. Positioning posts are also provided on both sides of the stirring shaft 63 at the top of the water tank 6. The top ends of the positioning posts extend into the interior of the bottom plate 47. The positioning posts ensure the stability of the water tank 6 after assembly. The top end of the stirring shaft 63 is a quadrangular cone and also includes a transmission component 7. The transmission component 7 includes a first transmission shaft 71, a second transmission shaft 72, and a protective cover 74. The first transmission shaft 71 is longitudinally rotatable inside the protective cover 74, and the second transmission shaft 72 is transversely rotatable inside the protective cover 74. The opposite ends of the first transmission shaft 71 and the second transmission shaft 72 mesh with each other through bevel gears. The bottom end of the first transmission shaft 71 penetrates to the outside of the protective cover 74 and connects with the stirring shaft 63. The top of the 3 is connected to the top of the transmission shaft 72. One end of the transmission shaft 72 is provided with a gear shaft 73. The bottom end of the gear plate 34 penetrates into the interior of the protective cover 74 and meshes with the gear shaft 73. In order to replace the water around the thin-walled copper pipe 61 and avoid the situation of prolonged heating reducing the cooling efficiency, the electric push rod 31 drives the gear plate 34 to rise and fall each time it moves. The gear plate 34 meshes with the gear shaft 73 to drive the transmission shaft 72 to rotate. The transmission shaft 72 drives the transmission shaft 71 to rotate through the bevel gear. This will drive the stirring shaft 63 to rotate, which in turn drives the stirring blade 64 to rotate and agitate the water flow. This allows the water around the thin-walled copper tube 61 inside the water tank 6 to exchange with water in other parts that are at a lower temperature, ensuring the cooling efficiency of the thin-walled copper tube 61 to the air. The bottom end of the drive shaft 71 is also a quadrilateral cone shape, which causes the drive shaft 71 and the stirring shaft 63 to be misaligned when they are connected. The stirring shaft 63 will automatically rotate to calibrate and complete the connection when it is resisted by the drive shaft 71, making the assembly process simpler.

[0048] When assembling the water tank 6, first press the water tank 6 against the pad 15 and then press it down. When the stirring shaft 63 and the positioning post are aligned with the through hole on the base plate 47, release the water tank 6. The pad 15 will be springed back and lift the water tank 6, allowing the stirring shaft 63 and the positioning post to pass through the base plate 47, thus smoothly connecting the stirring shaft 63 with the drive shaft 71. Start the opening and closing motor 55 to drive the two insulation plates 51 to move in opposite directions, disengaging from the heating plate 32. When the two insulation plates 51 move in opposite directions, the arc groove of the insulation plate 51 will contact the gas pipe 35 and disengage from it. Due to the linkage between the insulation plate 51 and the insulation plate 52... This causes the second insulation plate 52 to also detach from the obstruction of the heating plate 32 inside the moving mold 2. The electric push rod 31 is activated, causing the heating plate 32 to rise and enter the interior of the first temperature control chamber 12 and the second temperature control chamber 22. The heating plate 32 is activated to preheat the first and second temperature control chambers 12 and 22. After preheating, the electric push rod 31 is activated to reset, causing the heating plate 32 to be retracted into the interior of the insulation chamber 3. Simultaneously, the opening and closing motor 55 is activated, causing the two insulation plates 51 to move towards each other, closing the insulation chamber 3. The insulation plates 51, through the guide groove 58, do not obstruct the air supply pipe 35; they only press the air supply pipe 35 downwards. When the air pipe 35 comes into contact with the arc groove, the air supply pipe 35 will rebound and lock the arc groove through the spring, so that the air outlet 53 and the heat insulation cylinder 33 are coaxially opposite, and the air is smoothly transported. The molten material is poured through the gating channel 23. After the pouring is completed, the fan 41 is started to draw in the external ambient temperature air through the cooling hole 62. After the ambient temperature air enters the interior of the thin-walled copper pipe 61, the temperature of the ice water inside the water tank 6 is directly conducted to the thin-walled copper pipe 61, so that the temperature of the ambient temperature air can be greatly reduced after entering the interior of the thin-walled copper pipe 61. When the temperature of the ice water inside the water tank 6 is low, frost and condensation will be attached to the thin-walled copper pipe 61, further absorbing the temperature of the air. The moisture in the air is then removed by the demister 44, leaving only low-temperature air that enters the heat-insulating inner cylinder 331 through the air guide 42. After being insulated by the double layers of the heat-insulating inner cylinder 331 and the heat-insulating outer cylinder 332, the air enters the interior of the air supply pipe 35. The air inside the air supply pipe 35 enters the interior of the temperature control chamber 12 through the air outlet 53. After entering the interior of the temperature control chamber 12, the air first cools the temperature control chamber 12. Finally, the air enters the interior of the air inlet 24 through the air outlet 13, and then enters the interior of the temperature control chamber 22 through the air inlet 24 to cool the interior of the temperature control chamber 22. Finally, the air is discharged through the exhaust port 25.

[0049] In summary, compared to commonly available TPU protective sleeve injection molds, this product utilizes a combination of air and water cooling. The upper mold core 21 and lower mold core 11 are cooled by dehumidified, low-temperature air, preventing steam explosions. Furthermore, the insulation chamber 3 houses and insulates the preheated heating plate 32. During cooling, only the lower mold core 11 and upper mold core 21 are cooled, eliminating the need to cool the heating plate 32. This allows for rapid temperature increases in the heating plate 32 upon reuse, quickly preheating the lower mold core 11 and upper mold core 21, ensuring processing efficiency while saving heating energy, resulting in economic benefits and broad application prospects.

[0050] The TPU protective sleeve uses an injection mold. The second insulation plate 52 inside the moving mold 2 is driven by the first insulation plate 51 inside the fixed mold 1. There is no need to install the opening and closing motor 55 inside the moving mold 2, which reduces manufacturing and usage costs. The first insulation plate 51 and the second insulation plate 52 have high linkage. After the fixed mold 1 and the moving mold 2 are closed, they automatically connect and will not affect the demolding of the fixed mold 1 and the moving mold 2.

[0051] The TPU protective sleeve uses an injection mold. When the electric push rod 31 drives the heating plate 32 to move between the temperature control chamber 12, the temperature control chamber 22, and the insulation chamber 3, it simultaneously drives the toothed plate 34 to drive the stirring shaft 63 to rotate through the transmission component 7. The stirring shaft 63 drives the stirring blade 64 to rotate and agitate the water flow, so that the water around the thin-walled copper tube 61 inside the water tank 6 exchanges with the water in other parts with lower temperatures. This ensures the cooling efficiency of the thin-walled copper tube 61 to the air. Therefore, every time the injection molding process is performed, the stirring shaft 63 will agitate the water inside the water tank 6, further ensuring the cooling efficiency of the thin-walled copper tube 61 to the air.

[0052] It should be noted that, in this document, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An injection mold for a TPU protective sleeve, characterized in that, include: A fixed mold (1) is provided with a lower mold core (11) embedded at the top of the fixed mold (1), a temperature control cavity (12) is provided at the bottom of the lower mold core (11), and an operating cavity (14) is provided inside the fixed mold (1). The moving mold (2) has an upper mold core (21) embedded at its bottom and a temperature control cavity (22) connected to the temperature control cavity one (12) at its top. The heat preservation cavity (3) includes two, which are respectively opened inside the fixed mold (1) and the moving mold (2) and are respectively opposite to the temperature control cavity one (12) and the temperature control cavity two (22). The heat preservation cavity (3) is provided with an electric push rod (31) and a heating plate (32) located on the output end of the electric push rod (31) for heating the temperature control cavity one (12) and the temperature control cavity two (22). The bottom of the heating plate (32) located in the fixed mold (1) is provided with a heat insulation cylinder (33). The air-cooling mechanism (4) is used to cool the temperature control chamber 1 (12) and the temperature control chamber 2 (22). The air-cooling mechanism (4) includes a fan (41) installed inside the operating chamber (14) and an air guide frame (42) fixedly installed on the top of the inner wall of the operating chamber (14). The air guide frame (42) is used to connect the fan (41) and the heat insulation cylinder (33). A demister (44) is installed inside the air guide frame (42). The partition mechanism (5) is used to separate the heat insulation cavity (3) from the temperature control cavity one (12) and the temperature control cavity two (22). The partition mechanism (5) includes heat insulation plate one (51) and heat insulation plate two (52) respectively disposed inside the two heat insulation cavities (3). There are two heat insulation plates one (51) and two heat insulation plates two (52) and they are one-to-one opposite each other. The heat insulation plate one (51) has an air outlet hole (53) coaxially disposed with the heat insulation cylinder (33) to connect the heat insulation cylinder (33) and the temperature control cavity one (12) so that the air blown by the fan (41) is delivered to the interior of the temperature control cavity one (12). Water tank (6) is used to cool the air drawn by the fan (41). The water tank (6) is located inside the operating chamber (14). At least one thin-walled copper tube (61) is fixedly installed inside the water tank (6). Cooling holes (62) connected to the thin-walled copper tube (61) are opened at the top and bottom of the water tank (6) to connect the thin-walled copper tube (61) and the fan (41).

2. The injection mold for a TPU protective sleeve according to claim 1, characterized in that: The demister (44) is provided with at least one demister arc plate (45) inside. At least one moisture-absorbing silica gel (46) is provided on both sides of the demister arc plate (45). The top of the fan (41) is provided with a baffle (43) that is engaged with the air guide frame (42) by a spring. The top of the baffle (43) abuts against the bottom of the demister (44). Pressing down the baffle (43) disengages it from the demister (44) so ​​that the demister (44) falls down under gravity.

3. The injection mold for a TPU protective sleeve according to claim 1, characterized in that: A vent hole (13) is provided on one side of the inner wall of the temperature control cavity one (12), and an air inlet hole (24) connected to the vent hole (13) is provided on one side of the inner wall of the temperature control cavity two (22). An exhaust hole (25) extending to one side of the moving mold (2) is provided on the other side of the inner wall of the temperature control cavity two (22). The moving mold (2) is provided with a gating system (23) connected to the lower mold core (11) and the upper mold core (21).

4. The injection mold for a TPU protective sleeve according to claim 1, characterized in that: The heat insulation cylinder (33) includes a heat insulation inner cylinder (331) fixedly installed inside the heat insulation cavity (3) and a heat insulation outer cylinder (332) movably sleeved on the heat insulation inner cylinder (331). The top of the heat insulation outer cylinder (332) is fixedly connected to the bottom of the heating plate (32). A magnetic plate (311) is provided on the output end of the electric push rod (31). A heat insulation plate (312) is adsorbed on the magnetic plate (311). The side of the heat insulation plate (312) away from the magnetic plate (311) is fixedly connected to the heating plate (32). A toothed plate (34) is provided on the magnetic plate (311) located inside the fixed mold (1).

5. The injection mold for a TPU protective sleeve according to claim 4, characterized in that: An air supply pipe (35) is movably installed inside the heat-insulating inner cylinder (331) by a spring. The top end of the air supply pipe (35) extends to the outside of the heat-insulating inner cylinder (331) and abuts against the insulation plate (51). A sealing gasket (36) is provided between the bottom of the air supply pipe (35) and the heat-insulating inner cylinder (331), and a sealing gasket (37) is provided between the outside of the air supply pipe (35) and the top of the heat-insulating inner cylinder (331).

6. The injection mold for a TPU protective sleeve according to claim 5, characterized in that: The partition mechanism (5) also includes an opening and closing motor (55) for driving the first insulation plate (51) and the second insulation plate (52). The output end of the opening and closing motor (55) is provided with a gear. Both ends of the two first insulation plates (51) are provided with movable rods (54). The two movable rods (54) located on the same side are staggered and are both L-shaped. The gear on the output end of the opening and closing motor (55) extends between the two staggered movable rods (54) and the two movable rods (54) are provided with tooth grooves that mesh with the gear, so that when the opening and closing motor (55) is started to rotate in both directions, the gear drives the two first insulation plates (51) to move towards each other or away from each other.

7. The injection mold for a TPU protective sleeve according to claim 6, characterized in that: The top of the movable rod (54) is fixedly provided with a linkage rod one (56). The top of the linkage rod one (56) is provided with a conical groove. Both ends of the two insulation boards one (51) are provided with linkage rod two (57). The two linkage rod two (57) located on the same side are staggered. The bottom end of the linkage rod two (57) is conical and extends into the interior of the conical groove, so that when the movable rod (54) moves, the linkage rod one (56) drives the linkage rod two (57) to move synchronously, thereby realizing the linkage of the insulation board one (51) and the insulation board two (52).

8. The injection mold for a TPU protective sleeve according to claim 1, characterized in that: The bottom opening of the air outlet (53) is provided with an arc groove that engages with the top of the air supply pipe (35). The bottom of the opposite ends of the two insulation plates (51) are provided with guide grooves (58). The top and bottom of the insulation plates (51) and the insulation plates (52) are provided with sealing plates (59). The inside of the operating cavity (14) is provided with a pad (15) through a spring. The two ends of the pad (15) are arc-shaped. The bottom of the pad (15) is provided with a guide post (16) that extends through the bottom end into the fixed mold (1).

9. The injection mold for a TPU protective sleeve according to claim 1, characterized in that: The water tank (6) is equipped with a stirring shaft (63) inside. The stirring shaft (63) is equipped with stirring blades (64) for stirring the water inside the water tank (6) when the stirring shaft (63) rotates. The top of the stirring shaft (63) passes through the bottom plate (47) and extends to the top of the bottom plate (47). The top of the water tank (6) is also equipped with positioning posts on both sides of the stirring shaft (63). The top of the positioning posts extends into the interior of the bottom plate (47). The top of the stirring shaft (63) is a quadrilateral pyramid.

10. The injection mold for a TPU protective sleeve according to claim 4, characterized in that: It also includes a transmission component (7), which includes a first transmission shaft (71), a second transmission shaft (72), and a protective cover (74). The first transmission shaft (71) is longitudinally rotatably disposed inside the protective cover (74), and the second transmission shaft (72) is laterally rotatably disposed inside the protective cover (74). The opposite ends of the first transmission shaft (71) and the second transmission shaft (72) mesh with each other through bevel gears. The bottom end of the first transmission shaft (71) extends through to the outside of the protective cover (74) and is sleeved with the top of the stirring shaft (63). One end of the second transmission shaft (72) is provided with a gear shaft (73), and the bottom end of the toothed plate (34) extends through to the inside of the protective cover (74) and meshes with the gear shaft (73).

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