Injection mold for plastic preservation box

Abstract

The utility model belongs to injection mold field, concretely is a kind of injection mold for plastic preservation box, the inside of first frame body is provided with female die, the lower bottom surface of female die is provided with injection port, the upper of female die is slidably provided with male die, female die and male die shape are adapted, spiral baffle is arranged between female die and first frame body, spiral baffle separates the space between first frame body and female die into spiral air duct, the lower end surface of workbench is provided with hot air blower, the output end of hot air blower is communicated with the gap bottom between female die and first frame body, the side of first frame body is provided with air outlet nozzle, air outlet nozzle and the top of spiral air duct are provided with air duct, and the multiple air outlets on air outlet nozzle are all towards the inside of female die.The utility model is through the setting of spiral baffle and other components, when the outer wall of female die is preheated by hot air blower, hot air can be guided to the inner side wall of female die by air duct and air outlet nozzle, thereby forming the preheating of the inside and outside of female die.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology, and in particular relates to an injection mold for plastic food storage containers. Background Technology

[0002] Injection molding is a processing method used for the mass production of certain complex-shaped parts. Specifically, it involves injecting molten material into a mold cavity, which is then cooled and solidified to obtain a molded product. The molded plastic food storage container is then removed by opening the mold.

[0003] Patent application CN202320318779.6 discloses an injection mold for a plastic food storage container, relating to the field of plastic food storage container manufacturing technology. The mold includes a cold water pipe, a base plate, and a locking groove. A screw feeder is installed on the inner wall of one side of the fixed plate, and a heating tube is installed on the outer wall of the screw feeder. A right mold is connected to one side of the screw feeder, and pneumatic telescopic rods are installed at both ends of the right mold. A mounting block is connected to one side of each pneumatic telescopic rod, and a left mold is installed inside the mounting block. This invention utilizes a circulating pump to draw cold water from a water tank into a cold water pipe. The cold water flows within the cold water pipe, carrying away heat from the left mold. The heated water then circulates once before entering a cooler for rapid cooling. The cooled water then re-enters the water tank, and the circulating pump continues to operate, achieving cold water circulation within the cold water pipe. This facilitates rapid cooling of the extruded plastic product, improves production efficiency, and solves the problem of low production efficiency.

[0004] Existing technologies use water cooling circulation to cool the molded plastic food storage containers, but there are still shortcomings:

[0005] First, existing injection molds lack a preheating structure, which results in poor flow of liquid plastic inside the mold during subsequent injection molding, easily causing uneven thickness. In addition, the lack of preheating treatment inside the mold leads to uneven cooling lines on the outer surface of the food storage container that comes into contact with the mold, seriously affecting the overall quality of the food storage container.

[0006] Secondly, in existing injection molds, the plastic food storage container is pushed out by multiple feeding rods during molding. However, since the plastic food storage container itself has not been completely cooled, the support of the feeding rods can easily cause deformation of the local support points of the plastic food storage container, resulting in a decline in the overall production quality of the food storage container. Utility Model Content

[0007] To overcome the shortcomings of existing technologies, this invention provides an injection mold for plastic food storage containers. Through the arrangement of components such as spiral baffles, this invention allows for preheating of the outer wall of the mold cavity by a hot air blower, while the hot air is guided to the inner wall of the mold cavity via air ducts and nozzles, thus achieving preheating of both the inner and outer sides of the mold cavity.

[0008] To achieve the above objectives, this utility model provides the following technical solution: an injection mold for a plastic food storage container, comprising a workbench, characterized in that a first frame is provided on the upper surface of the workbench, a concave mold is provided inside the first frame, an injection port is provided on the lower surface of the concave mold, a convex mold is slidably provided above the concave mold, the concave mold and the convex mold are adapted to each other in shape, a spiral baffle is provided between the concave mold and the first frame, the spiral baffle divides the space between the first frame and the concave mold into a spiral air duct, a hot air blower is provided on the lower surface of the workbench, the output end of the hot air blower is connected to the bottom of the gap between the concave mold and the first frame, an air outlet nozzle is provided on one side of the first frame, an air guide pipe is provided connecting the air outlet nozzle and the top of the spiral air duct, and multiple air outlets on the air outlet nozzle face the interior of the concave mold.

[0009] Optionally, a second frame is slidably disposed above the punch, the lower end face of the second frame is fixed to the upper end face of the punch by bolts, a cooling mesh pipe is disposed inside the punch, and a water circulation assembly is disposed above the second frame to provide cooling water for the internal circulation of the cooling mesh pipe.

[0010] Optionally, the water circulation assembly includes a water storage tank disposed above the second frame, a circulating water pump connected to one side of the water storage tank, an inlet hose connected between the input end of the circulating water pump and the outlet of the cooling network pipe, and an outlet hose connected between the water storage tank and the inlet of the cooling network pipe.

[0011] Optionally, a cooler is provided on one side of the water storage tank, and the output end of the cooler extends into the interior of the water storage tank through the side wall of the water storage tank.

[0012] Optionally, the lower end face of the punch is provided with a shaped snap-fit ​​groove, and a shaped support plate is slidably disposed inside the shaped snap-fit ​​groove.

[0013] Optionally, a second support frame is provided on the upper end face of the second frame, and a first push cylinder is provided inside the second support frame on the upper end face of the second frame. A sliding rod is fixedly provided on the upper end face of the irregular support plate, and the sliding rod is slidably connected to the lower end face of the punch. The output end of the first push cylinder passes through the second frame and is fixedly connected to the upper end face of the sliding rod.

[0014] Optionally, a guide groove is provided above the injection port on the lower end face of the irregular support plate.

[0015] In summary, compared with existing technologies, the beneficial effects of this solution are as follows:

[0016] (1) By setting up components such as spiral baffles, air guide pipes and air nozzles, this utility model can guide hot air to the inner wall of the mold through the air guide pipes and air nozzles when the hot air blower preheats the outer wall of the mold in a circumferential manner, thereby forming preheating of the inner and outer sides of the mold and effectively improving the overall quality of subsequent food preservation box injection molding.

[0017] (2) By setting up components such as sliding rods, irregular support plates and guide grooves, this utility model enables the liquid plastic to flow more evenly between the concave and convex molds during injection molding through the guidance of the irregular support plates, thereby making the thickness of the molded food storage box uniform and improving the overall quality of injection molding. At the same time, by setting up guide grooves, a reinforced raised texture is formed on the lower end face of the molded food storage box, improving the overall load-bearing strength of the food storage box. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present utility model;

[0019] Figure 2 This is a side view of the present invention;

[0020] Figure 3 for Figure 2 A three-dimensional cross-sectional view at point AA;

[0021] Figure 4 for Figure 3 Enlarged view of a section at point B;

[0022] Figure 5 This is a perspective view of the spiral baffle part in this utility model;

[0023] Figure 6 This is a perspective view of the irregularly shaped support plate part in this utility model.

[0024] In the figure: workbench 10, first frame 11, first support frame 12, concave mold 13, second frame 14, convex mold 15, cooling network pipe 16, water storage tank 17, water outlet hose 18, water inlet hose 19, second support frame 20, sliding rod 21, irregular support plate 22, guide groove 23, first push cylinder 24, injection port 25, spiral baffle 26, 27, hot air blower 28, air duct 29, air outlet nozzle 30, cooler 31, circulating water pump 32, irregular snap-fit ​​groove 33. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0026] Example 1:

[0027] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, an injection mold for a plastic food storage container includes a workbench 10. A first frame 11 is provided on the upper surface of the workbench 10. A cavity mold 13 is provided inside the first frame 11. The cavity mold 13 and the first frame 11 are fixed together by bolts for easy replacement in case of damage. An injection port 25 is provided on the lower surface of the cavity mold 13. The injection port 25 is connected to the output port of an external injection molding machine. The injection molding machine injects material into the cavity mold 13 and the convex mold through the injection port 25. High-pressure injection molding is performed on the gap between the molds 15. Multiple venting grooves are provided on the upper end face of the first frame 11 and the die 13 to allow air to escape from the gap between the die 13 and the punch 15 during injection molding. The punch 15 is slidably arranged above the die 13. The shapes of the die 13 and the punch 15 are matched. A spiral baffle 26 is provided between the die 13 and the first frame 11. The spiral baffle 26 isolates the gap between the first frame 11 and the die 13 into a spiral air duct.

[0028] A hot air blower 28 is provided on the lower end face of the workbench 10. The output end of the hot air blower 28 is connected to the bottom of the cavity between the cavity 13 and the first frame 11. An air outlet nozzle 30 is provided on one side of the first frame 11. An air guide pipe 29 is provided to connect the air outlet nozzle 30 and the top of the spiral air duct. Multiple air outlets on the air outlet nozzle 30 face the inside of the cavity 13. The hot air blower 28 is a common hot air exhaust fan, which is existing technology. The output end of the hot air blower 28 inputs air to the bottom of the spiral air duct. The air moves upward through the spiral air duct, forming a preheating of the outer wall of the cavity 13. When the air reaches the top of the spiral air duct, it is guided into the inside of the air outlet nozzle 30 through the air guide pipe 29. Then, hot air is input into the inside of the cavity 13 through the air outlet nozzle 30, forming a preheating treatment of the inner wall of the cavity 13, making the overall preheating of the cavity 13 more uniform, thereby improving the quality of subsequent mold injection.

[0029] Furthermore, such as Figure 3 and Figure 4 As shown, a second frame 14 is slidably disposed above the punch 15. The lower end face of the second frame 14 is fixed to the upper end face of the punch 15 by bolts, thereby facilitating the disassembly and replacement of the punch 15 when it is damaged. A cooling mesh pipe 16 is provided inside the punch 15. The cooling mesh pipe 16 is as follows: Figure 3As shown, the whole is mesh-like and closely abuts against the inner wall of the punch 15. A water circulation component is provided above the second frame 14 to provide cooling water for the internal circulation of the cooling mesh tube 16. Through the water circulation component, cold water is circulated inside the cooling mesh tube 16, thereby cooling the outer wall of the punch 15, and thus cooling the plastic food storage box that is sleeved on the outside of the punch 15, which facilitates the subsequent unloading of the plastic food storage box.

[0030] Furthermore, such as Figure 4 and Figure 6 As shown, the lower end face of the punch 15 is provided with a shaped snap-fit ​​groove 33, and a shaped support plate 22 is slidably disposed inside the shaped snap-fit ​​groove 33. A guide groove 23 is provided directly above the injection port 25 on the lower end face of the shaped support plate 22. The shape of the shaped support plate 22 is as follows... Figure 6 As shown, the overall structure is cross-shaped, but it can also be configured as a support structure with multiple uniformly symmetrical plates, such as a star shape. Each plate has a guide groove 23 inside. Therefore, the irregularly shaped support plate 22 can support the food storage box outside the punch 15 during vertical downward movement. The support force of the irregularly shaped support plate 22 on the inner bottom surface of the food storage box is uniform, which can effectively prevent local support deformation of the inner bottom surface of the food storage box during support and material cutting. Moreover, the equipment with multiple guide grooves 23 can cooperate with the injection port 25 to perform high-pressure injection between the die 13 and the punch 15. The liquid plastic first contacts the center position of the guide groove 23, and then flows outward along the multiple guide grooves 23 in a scattering manner, making the liquid plastic flow more uniform inside the mold, thereby improving the molding quality of the food storage box. At the same time, due to the concave setting of the guide groove 23, a protrusion is formed on the inner bottom surface of the injection molded food storage box that is engaged with the shape of the guide groove 23. This protrusion can effectively improve the hardness and overall strength of the food storage box.

[0031] A second support frame 20 is provided on the upper end face of the second frame 14. A first push cylinder 24 is provided inside the second support frame 20 on the upper end face of the second frame 14. A sliding rod 21 is fixedly provided on the upper end face of the irregular support plate 22. The sliding rod 21 is slidably connected to the lower end face of the punch 15. The output end of the first push cylinder 24 passes through the second frame 14 and is fixedly connected to the upper end face of the sliding rod 21. The first push cylinder 24 is an ordinary electric push cylinder, and the stroke of its output end can be adjusted according to the requirements. The output end of the first push cylinder 24 drives the sliding rod 21 to slide vertically, thereby driving the irregular support plate 22 to slide vertically. After the food storage box is injection molded, the food storage box will be attached to the outer wall of the punch 15. The downward movement of the irregular support plate 22 forms downward support for the inner bottom surface of the food storage box, thereby forming the unloading of the food storage box. An external robot or manual labor will be used to remove and place the food storage box on one side of the mold.

[0032] Furthermore, such as Figure 3As shown, the water circulation assembly includes a water storage tank 17 disposed above the second frame 14. A circulating water pump 32 is connected to one side of the water storage tank 17. An inlet hose 19 is connected between the input end of the circulating water pump 32 and the outlet of the cooling network pipe 16. An outlet hose 18 is connected between the inlet of the water storage tank 17 and the inlet of the cooling network pipe 16. The circulating water pump 32 is a common circulating water pump, which is existing technology. The circulating water pump 32 draws water from inside the water storage tank 17 and inputs it into the cooling network pipe 16 through the inlet hose 19. The water inside the cooling network pipe 16 then flows back into the water storage tank 17 through the outlet hose 18, thereby forming... The circulation of water inside the cooling network pipe 16 enables the cooling network pipe 16 to cool the inner wall of the punch 15. After injection molding, the punch 15 can be cooled in time, thereby cooling and shaping the molded food storage box. A cooler 31 is provided on one side of the water storage tank 17. The output end of the cooler 31 extends into the interior of the water storage tank 17 through the side wall of the water storage tank 17. The water storage tank 17 is a rapid cooler. A cooling rod is provided at the output end of the water storage tank 17. The cooling rod extends into the interior of the water storage tank 17 to rapidly cool the water inside the water storage tank 17, thereby ensuring the cooling efficiency of the cooling network pipe 16 on the punch 15 and the food storage box.

[0033] Furthermore, such as Figure 1 and Figure 2 As shown, a first support frame 12 is provided above the second support frame 20 on the upper end face of the workbench 10. The water storage tank 17 and the circulating water pump 32 are both provided on the upper end face of the first support frame 12. A second push cylinder is also provided on the upper end face of the first support frame 12. The output end of the second push cylinder passes through the first support frame 12 and is fixedly connected to the upper end face of the second support frame 20. The second push cylinder is an ordinary electric push cylinder, and the stroke of its output end can be adjusted according to the requirements. This is existing technology. The output end of the second push cylinder drives the second support frame 20, the second frame 14, and the punch 15 to move vertically, so that the punch 15 moves into the interior of the die 13 or moves upward from the interior of the die 13, forming the mold closing and mold opening operations.

[0034] Finally, it should be noted that the injection mold for a plastic food storage container of this utility model needs to protect the various mechanical structures and related motion logic in this solution. Therefore, it does not elaborate on the various sensors, detectors, and driving components required for the actual operation of the specific mechanical structures. However, for those skilled in the art, various control systems and electrical connection methods, including various electrical components and driving components, can be completed using conventional technical means. As long as the beneficial effects or the specific actions during the above-mentioned work can be achieved, they can be implemented. This solution does not impose too many restrictions.

[0035] Furthermore, the electric push cylinder, circulating water pump, hot air blower, and air outlet nozzle in the injection mold for the plastic food storage container of this utility model are all purchased from the market. Technical personnel in this industry only need to install and operate it according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0036] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0037] The foregoing description illustrates and describes several preferred embodiments of this application. However, as previously stated, it should be understood that this application is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the application concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this application should be within the protection scope of the appended claims.

Claims

1. An injection mold for a plastic food storage container, comprising a workbench (10), characterized in that, The upper surface of the workbench (10) is provided with a first frame (11), and a cavity mold (13) is provided inside the first frame mold (11). The bottom surface of the cavity mold (13) is provided with an injection port (25). A punch mold (15) is slidably provided above the cavity mold (13). The shapes of the cavity mold (13) and the punch mold (15) are adapted to each other. A spiral baffle (26) is provided between the cavity mold (13) and the first frame mold (11). The spiral baffle (26) separates the first frame mold (11) from the cavity mold (15). The space between the molds (13) is divided into a spiral air duct. A hot air blower (28) is provided on the lower end face of the workbench (10). The output end of the hot air blower (28) is connected to the bottom of the gap between the die (13) and the first frame (11). An air outlet nozzle (30) is provided on one side of the first frame (11). An air guide pipe (29) is provided between the air outlet nozzle (30) and the top of the spiral air duct. Multiple air outlets on the air outlet nozzle (30) face the interior of the die (13).

2. The injection mold for a plastic food storage container according to claim 1, characterized in that, A second frame (14) is slidably disposed above the punch (15). The lower end face of the second frame (14) is fixed to the upper end face of the punch (15) by bolts. A cooling mesh pipe (16) is disposed inside the punch (15). A water circulation assembly for providing cooling water to the cooling mesh pipe (16) is disposed above the second frame (14).

3. The injection mold for a plastic food storage container according to claim 2, characterized in that, The water circulation assembly includes a water storage tank (17) disposed above the second frame (14). A circulating water pump (32) is connected to one side of the water storage tank (17). An inlet hose (19) is connected between the input end of the circulating water pump (32) and the outlet of the cooling network pipe (16). An outlet hose (18) is connected between the inlet of the water storage tank (17) and the outlet of the cooling network pipe (16).

4. The injection mold for a plastic food storage container according to claim 3, characterized in that, A cooler (31) is provided on one side of the water storage tank (17), and the output end of the cooler (31) extends into the interior of the water storage tank (17) through the side wall of the water storage tank (17).

5. The injection mold for a plastic food storage container according to claim 2, characterized in that, The lower end face of the punch (15) is provided with a shaped snap-fit ​​groove (33), and a shaped support plate (22) is slidably disposed inside the shaped snap-fit ​​groove (33).

6. The injection mold for a plastic food storage container according to claim 5, characterized in that, The upper end face of the second frame (14) is provided with a second support frame (20), and the interior of the second support frame (20) is provided with a first push cylinder (24) on the upper end face of the second frame (14). The upper end face of the irregular support plate (22) is fixedly provided with a sliding rod (21), and the sliding rod (21) is slidably connected to the lower end face of the punch (15). The output end of the first push cylinder (24) passes through the second frame (14) and is fixedly connected to the upper end face of the sliding rod (21).

7. The injection mold for a plastic food storage container according to claim 1, characterized in that, A guide groove (23) is provided on the lower end face of the irregular support plate (22) directly above the injection port (25).

Images