Cooling structure for injection mold

Abstract

The utility model discloses a cooling structure for an injection mold, and particularly relates to the technical field of automobile injection molding production, the cooling structure comprises a cooling box fixed at the top of an upper mold and a recovery assembly fixed at the bottom of a lower mold, the cooling box is communicated with the recovery assembly through four groups of conduction assemblies, and the recovery assembly comprises a heat insulation box. A hot water cavity and a communicating cavity located at the top of the hot water cavity are formed in the heat insulation box, and a material ejecting assembly located at the bottom of a lower mold cavity is arranged at the top of the communicating cavity. And hot water in the hot water cavity enters the communicating cavity to drive the ejection assembly to eject a product in the lower die cavity and clean the interior of the die cavity. The heat recovery device not only can recover heat in the injection molding process, but also is wide in application range of the recovered heat, and is beneficial to saving enterprise cost.

Description

Technical Field

[0001] This utility model relates to the field of automotive injection molding technology, specifically to a cooling structure for injection molds. Background Technology

[0002] Plastic parts used in automobiles, such as bumpers, grilles, headlight covers, mudguards, and side mirror housings, are all made using injection molding. The specific process involves drying plastic granules, adding them to the barrel of an injection molding machine, heating and melting them, and then injecting them into the mold cavity under the push of the screw. After holding the pressure and cooling, the mold is opened and the finished product is ejected. Finally, the injection-molded product undergoes post-processing, such as trimming the gate, surface treatment, and inspection, to ensure that the quality and appearance of the product meet the requirements.

[0003] In injection molding, cooling time typically accounts for a large portion of the entire molding cycle, generally reaching 50% to 80%. An effective cooling system can quickly remove heat from the mold and plastic, allowing the plastic to solidify and cool rapidly, thereby reducing injection cycle time and improving production efficiency. During cooling, a significant amount of heat is released into the air. To avoid substantial resource loss, existing technologies can recover the heat from the cooling water, such as the injection mold with an active heat recovery structure described in prior art publication number CN215396695U.

[0004] The aforementioned existing technology uses cold water to cool the inside of the mold cavity, which accelerates the molding of plastic parts. Then, the water with high heat inside the cooling pipe can be introduced to other production processes for use. However, only hot water is transported to subsequent processes, and the scope of heat recovery and utilization is limited, which is not conducive to cost savings for enterprises. Utility Model Content

[0005] Therefore, this utility model provides a cooling structure for injection molds, which can not only realize the recovery of heat during the injection process, but also has a wide range of uses for the recovered heat, which is conducive to saving enterprise costs.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a cooling structure for injection molds, comprising a cooling box fixed to the top of the upper mold and a recycling component fixed to the bottom of the lower mold, wherein the cooling box and the recycling component are connected by four sets of conductive components.

[0007] The recycling component includes an insulated box, which has a hot water chamber and a connecting chamber at the top of the hot water chamber. The connecting chamber has a top material ejector assembly at the bottom of the lower mold cavity.

[0008] When the mold is closed, cooling water enters the cooling tank to cool the products in the upper and lower molds. When the mold is opened, hot water in the hot water chamber enters the connecting cavity to drive the ejector assembly to lift the products in the lower mold cavity and clean the mold cavity.

[0009] Furthermore, four sliding grooves are provided on both sides of the hot water chamber and the connecting chamber inside the heat insulation box. The hot water chamber is connected to the four sliding grooves through through hole one, and the connecting chamber is connected to the four sliding grooves through through hole two.

[0010] Furthermore, a liquid inlet pipe is fixed on one side of the cooling box to facilitate the entry of cooling water into the cooling box to cool the product in the mold.

[0011] Furthermore, each set of conductive components includes a pipe connected to the cooling box. The ends of the four pipes away from the cooling box pass through the top of the heat insulation box and extend into the four sliding grooves respectively. A slider is fixed at the end of each pipe extending into the sliding groove. The slider is slidably connected to the sliding groove. A cavity communicating with the pipe is opened in the slider. A through hole three communicating with the cavity is opened on one side of the slider.

[0012] Furthermore, a rubber frame is fixed to the outer end of the slider. The rubber frame is located in the slide groove, and the outer wall of the rubber frame is in contact with the inner wall of the slide groove. A through hole four communicating with through hole three is opened on the outer wall of the rubber frame.

[0013] Furthermore, during mold closing, the guiding component moves downward with the upper mold, causing the rubber frame to close the second through hole. The hot water chamber communicates with the cavity through the first, fourth, and third through holes, and the cooled hot water in the cooling box flows into the hot water chamber for collection.

[0014] Furthermore, an overflow valve communicating with the hot water chamber is fixed at the front end of the heat insulation box, and a drain pipe communicating with the hot water chamber is fixed at the rear end of the heat insulation box. A valve is fixed on the drain pipe to facilitate the outflow of hot water from the hot water chamber.

[0015] Furthermore, during mold opening, the guiding component moves upward with the upper mold, allowing the connecting cavity and the slide to communicate through the second through hole, and the hot water cavity to communicate with the slide through the first through hole. Water vapor in the hot water cavity enters the connecting cavity through the first through hole, the slide, and the second through hole.

[0016] Furthermore, the ejector assembly includes an installation cavity at the top of the connecting cavity and a pusher cavity at the top of the insulation box. The installation cavity and the connecting cavity are connected by a connecting port. The pusher cavity is located at the top of the installation cavity, and a slide rod is provided through the pusher cavity and the installation cavity. A pusher plate is fixed at the top of the slide rod, and a sliding plate is fixed at the bottom of the slide rod. The sliding plate is slidably disposed in the installation cavity, and the bottom end of the sliding plate is connected to the bottom end of the installation cavity by a spring. The pusher plate is adapted to the pusher cavity. When the mold is closed, the pusher plate enters the pusher cavity. When the mold is opened, the water vapor in the connecting cavity enters the installation cavity and pushes the pusher plate into the lower mold cavity to eject the product.

[0017] Furthermore, a sealing gasket is fixed to the inner wall of the push plate cavity, and a sealing ring is fixed to the outer wall of the slide plate, with the outer wall of the sealing ring fitting against the inner wall of the mounting cavity.

[0018] This utility model has the following advantages:

[0019] During mold closing, cooling water enters the cooling tank to cool the product in the upper and lower molds. The hot water formed after heat exchange is collected in the hot water chamber. When the mold opens, the pressure of the water vapor in the hot water chamber pushes the push plate of the ejector assembly into the mold cavity of the lower mold to eject the product, facilitating product removal. At the same time, it can blow the residual plastic debris in the lower mold cavity upwards, cleaning the lower mold cavity and improving the production quality of subsequent products. The remaining hot water can be discharged for subsequent production processes. Compared with the prior art, this utility model can not only realize the recovery of heat during injection molding, but also has a wide range of uses for the recovered heat, which is conducive to saving enterprise costs. Attached Figure Description

[0020] Figure 1 A schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a front sectional view of the overall structure during mold opening provided by this utility model;

[0022] Figure 3 Provided by this utility model Figure 2 Enlarged view of part A in the image;

[0023] Figure 4 This utility model provides a front sectional view of the overall structure during mold closing.

[0024] Figure 5 This is a partial cross-sectional view of the conductive component provided by this utility model;

[0025] In the diagram: 1. Upper mold, 2. Lower mold, 3. Cooling box;

[0026] 4. Recycling component; 41. Insulation box; 42. Hot water chamber; 43. Connecting chamber; 44. Slide groove; 45. Through hole one; 46. Through hole two;

[0027] 5. Conductor assembly, 51. Pipe, 52. Slider, 53. Cavity, 54. Through hole three, 55. Rubber frame, 56. Through hole four;

[0028] 6. Top material assembly, 61. Mounting cavity, 62. Push plate cavity, 63. Slide rod, 64. Push plate, 65. Slide plate, 66. Spring, 67. Sealing ring, 68. Sealing gasket, 69. Connecting port;

[0029] 7. Liquid inlet pipe, 8. Overflow valve. Detailed Implementation

[0030] Refer to the instruction manual appendix Figure 1-5 The injection mold includes an upper mold 1 and a lower mold 2 located at the bottom of the upper mold 1. The upper mold 1 moves down and closes with the lower mold 2 to perform the injection molding process for automotive plastic parts.

[0031] This utility model provides a cooling structure for injection molds. A cooling box 3 is fixed on the top of the upper mold 1, and an inlet pipe 7 is fixed on one side of the cooling box 3. When the mold is closed, cooling water enters the cooling box 3 through the inlet pipe 7 to cool the products in the upper mold 1 and the lower mold 2. The cooling box 3 is preferably made of materials with good thermal conductivity such as copper and aluminum, which facilitates better heat exchange between the cooling water in the cooling box 3 and the injection mold.

[0032] Next, a recycling component 4 is fixed at the bottom of the lower mold 2. The recycling component 4 includes a heat insulation box 41 and a connecting cavity 43 located at the top of the hot water cavity 42. The heat insulation box 41 has a hot water cavity 42 inside. Four sliding grooves 44 are opened on both sides of the hot water cavity 42 and the connecting cavity 43 inside the heat insulation box 41. The hot water cavity 42 is connected to the four sliding grooves 44 through a first through hole 45. The connecting cavity 43 is connected to the four sliding grooves 44 through a second through hole 46.

[0033] The cooling tank 3 and the recovery component 4 are connected by four sets of conductive components 5 so that the hot water formed after the cooling water heat exchange is stored in the hot water chamber 42. Specifically, each set of conductive components 5 includes a pipe 51 connected to the cooling tank 3. The end of each of the four pipes 51 away from the cooling tank 3 passes through the top of the heat insulation box 41 and extends into the four slide grooves 44 respectively. A slider 52 is fixed at the end of each pipe 51 that extends into the slide groove 44. The slider 52 is slidably connected to the slide groove 44.

[0034] The slider 52 has a cavity 53 that communicates with the pipe 51. The slider 52 has a through hole 54 that communicates with the cavity 53 on one side. A rubber frame 55 is fixed to the outer end of the slider 52. The rubber frame 55 is located in the slide groove 44 and the outer wall of the rubber frame 55 is in contact with the inner wall of the slide groove 44. The outer wall of the rubber frame 55 has a through hole 56 that communicates with the through hole 54.

[0035] During mold closing, the upper mold 1 and cooling box 3 move downwards, and the guiding component 5 also moves downwards. Simultaneously, the slider 52 slides along the slide groove 44 to guide the movement of the upper mold 1, facilitating accurate mold closing and injection molding. When the slider 52 reaches its limit position, the rubber frame 55 closes the second through hole 46. The hot water cavity 42 communicates with the cavity 53 through the first through hole 45, the fourth through hole 56, and the third through hole 54. Figure 4 As shown, during the injection molding process, the cooled hot water in the cooling box 3 flows into the hot water chamber 42 through pipe 51, cavity 53, through hole three 54, through hole four 56 and through hole one 45 for collection. An overflow valve 8 connected to the hot water chamber 42 is fixed at the front end of the heat insulation box 21. The hot water in the hot water chamber 42 can flow out and be collected through the overflow valve 8. Therefore, the hot water in the hot water chamber 42 is flowing hot water, and the collected hot water can be used in other processes to realize the recovery of heat during the injection molding process.

[0036] Next, an ejector assembly 6 is provided at the top of the connecting cavity 43 and located at the bottom of the lower mold 2 cavity. The number of ejector assemblies 6 is the same as the number of inner mold cavities of the lower mold 2. The ejector assembly 6 includes an installation cavity 61 opened at the top of the connecting cavity 43 and a push plate cavity 62 opened at the top of the heat insulation box 41. The installation cavity 61 is connected to the connecting cavity 43 through a connecting port 69. The push plate cavity 62 is located at the top of the installation cavity 61, and a slide rod 63 is provided through the push plate cavity 62 and the installation cavity 61. A push plate 64 is fixed at the top of the slide rod 63, and a slide plate 65 is fixed at the bottom of the slide rod 63. The slide plate 65 is slidably disposed in the installation cavity 61, and the bottom of the slide plate 65 is connected to the bottom of the interior of the installation cavity 61 by a spring 66. The push plate 64 is adapted to the push plate cavity 62, and a sealing gasket 68 is fixed on the inner wall of the push plate cavity 62. A sealing ring 67 is fixed on the outer wall of the slide plate 65, and the outer wall of the sealing ring 67 is in contact with the inner wall of the installation cavity 61.

[0037] During injection molding, the ejector plate 64, under the elastic force of the spring 66, enters the ejector plate cavity 62, sealing the ejector plate cavity 62 and the bottom of the lower mold cavity 2. Figure 4 As shown, this allows the raw material to enter the cavity of the lower mold 2 for molding; after injection molding, the upper mold 1 moves upward to open the mold, and the connecting component 5 moves upward with the upper mold 1, so that the connecting cavity 43 and the slide 44 are connected through the second through hole 46, and the hot water cavity 42 is connected to the slide 44 through the first through hole 45. At this time, because the temperature and pressure in the hot water cavity 42 are high, the water vapor in the hot water cavity 42 enters the connecting cavity 43 through the first through hole 45, the slide 44 and the second through hole 46. The water vapor in the connecting cavity 43 enters the mounting cavity 61 through the connecting port 69, pushing the slide rod 63 upward to move, thereby pushing the push plate 64 upward into the cavity of the lower mold 2, as shown. Figure 2 As shown ( Figure 2 The black arrow in the middle indicates the water vapor flow path, which ejects the product to facilitate product removal (in order to avoid water vapor burns to personnel, it is preferable to use a robotic arm to remove the ejected product from the lower mold cavity 2). At the same time, the water vapor sprayed from the lower mold cavity 2 can blow the residual plastic debris in the lower mold cavity 2 upward, thereby cleaning the lower mold cavity 2 and improving the production quality of subsequent products.

[0038] In addition, a drain pipe connected to the hot water chamber 42 is fixed at the rear end of the insulation box 41, and a valve is fixed on the drain pipe to facilitate the discharge of hot water from the hot water chamber 42 when not in production.

[0039] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A cooling structure for injection molds, characterized in that: It includes a cooling box (3) fixed to the top of the upper mold (1) and a recycling assembly (4) fixed to the bottom of the lower mold (2), wherein the cooling box (3) and the recycling assembly (4) are connected by four sets of conductive components (5); The recycling component (4) includes a heat insulation box (41), which has a hot water chamber (42) and a connecting cavity (43) located at the top of the hot water chamber (42). The top of the connecting cavity (43) is provided with an ejector component (6) located at the bottom of the lower mold cavity (2). When the mold is closed, cooling water enters the cooling tank (3) to cool the products in the upper mold (1) and the lower mold (2); When the mold is opened, the hot water in the hot water chamber (42) enters the connecting chamber (43) to drive the ejector assembly (6) to lift the product in the lower mold cavity (2) and clean the mold cavity.

2. The cooling structure for injection molds according to claim 1, characterized in that: The heat insulation box (41) has four sliding grooves (44) on both sides of the hot water chamber (42) and the connecting chamber (43). The hot water chamber (42) is connected to the four sliding grooves (44) through a through hole one (45), and the connecting chamber (43) is connected to the four sliding grooves (44) through a through hole two (46).

3. The cooling structure for injection molds according to claim 1, characterized in that: The cooling tank (3) is fixed with an inlet pipe (7) on one side to facilitate the entry of cooling water into the cooling tank (3).

4. The cooling structure for injection molds according to claim 2, characterized in that: Each set of conductive components (5) includes a pipe (51) connected to the cooling box (3). The end of each of the four pipes (51) away from the cooling box (3) passes through the top of the heat insulation box (41) and extends into the four slide grooves (44) respectively. A slider (52) is fixed at the end of each pipe (51) that extends into the slide groove (44). The slider (52) is slidably connected to the slide groove (44). The slider (52) has a cavity (53) communicating with the pipe (51) and a through hole (54) communicating with the cavity (53) is provided on one side of the slider (52).

5. A cooling structure for injection molds according to claim 4, characterized in that: A rubber frame (55) is fixed to the outer end of the slider (52). The rubber frame (55) is located in the slide groove (44), and the outer wall of the rubber frame (55) is in contact with the inner wall of the slide groove (44). A through hole (56) communicating with the through hole three (54) is opened on the outer wall of the rubber frame (55).

6. A cooling structure for injection molds according to claim 5, characterized in that: When the mold is closed, the guide component (5) moves down with the upper mold (1), causing the rubber frame (55) to close the second through hole (46). The hot water chamber (42) is connected to the cavity (53) through the first through hole (45), the fourth through hole (56) and the third through hole (54). The cooled hot water in the cooling box (3) flows into the hot water chamber (42) for collection.

7. A cooling structure for injection molds according to claim 6, characterized in that: An overflow valve (8) communicating with the hot water chamber (42) is fixed at the front end of the heat insulation box (41), and a drain pipe communicating with the hot water chamber (42) is fixed at the rear end of the heat insulation box (41). A valve is fixed on the drain pipe to facilitate the outflow of hot water from the hot water chamber (42).

8. A cooling structure for injection molds according to claim 6, characterized in that: When the mold is opened, the connecting component (5) moves upward with the upper mold (1), so that the connecting cavity (43) and the slide (44) are connected through the second through hole (46), and the hot water cavity (42) and the slide (44) are connected through the first through hole (45). Water vapor in the hot water cavity (42) enters the connecting cavity (43) through the first through hole (45), the slide (44) and the second through hole (46).

9. A cooling structure for injection molds according to claim 8, characterized in that: The top material assembly (6) includes an installation cavity (61) opened at the top of the connecting cavity (43) and a push plate cavity (62) opened at the top of the heat insulation box (41). The installation cavity (61) and the connecting cavity (43) are connected through a connecting port (69). The push plate cavity (62) is located at the top of the installation cavity (61), and a slide rod (63) is provided through the push plate cavity (62) and the installation cavity (61). The top of the slide rod (63) is fixed with a push plate (64), and the bottom of the slide rod (63) is fixed with a slide plate (65). The slide plate (65) is slidably disposed in the mounting cavity (61), and the bottom of the slide plate (65) is connected to the bottom of the mounting cavity (61) by a spring (66). The push plate (64) is adapted to the push plate cavity (62). When the mold is closed, the push plate (64) enters the push plate cavity (62). When the mold is opened, the water vapor in the connecting cavity (43) enters the mounting cavity (61) and pushes the push plate (64) into the lower mold (2) cavity to eject the product.

10. A cooling structure for injection molds according to claim 9, characterized in that: A sealing gasket (68) is fixed to the inner wall of the push plate cavity (62), and a sealing ring (67) is fixed to the outer wall of the slide plate (65), with the outer wall of the sealing ring (67) fitting against the inner wall of the mounting cavity (61).

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