Injection molding mold for plastic fan blades of automobile cooling fan

Abstract

The utility model belongs to the technical field of molds, and particularly relates to an injection molding mold for plastic fan blades of an automobile cooling fan. The plastic fan blade forming die comprises a lower plastic fan blade forming die and an upper plastic fan blade forming die, an injection molding main board is arranged above the upper plastic fan blade forming die, and a lower fan blade forming seat and a central forming shaft seat are arranged in the lower plastic fan blade forming die. In the using process, through the omnibearing cooling water path system which is symmetrical up and down, the lower fan blade cooling piece and the upper fan blade cooling piece accurately correspond to each other, and the annular cooling pipelines which correspond to each other up and down are also arranged at the central part, in the cooling process, cooling liquid can simultaneously and uniformly act on the upper surface, the lower surface and the central area of the plastic fan blade; the cooling uniformity is greatly improved, the problems of deformation, internal stress concentration and the like of the product caused by cooling difference are effectively reduced, and the uniformity and the overall quality of the upper surface and the lower surface of the product are remarkably improved.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology and relates to an injection molding mold for plastic fan blades of automotive cooling fans. Background Technology

[0002] Injection molding is a common process in the production of plastic fan blades for automotive cooling fans. However, existing injection molds have shortcomings in the cooling process. Traditional mold cooling methods often fail to achieve uniform cooling of the upper and lower surfaces of the plastic fan blades, resulting in inconsistent surface properties and problems such as deformation and uneven internal stress, affecting product quality and service life. Furthermore, the demolding process is not smooth or efficient enough, further reducing production efficiency. Therefore, developing an injection mold for automotive cooling fan plastic fan blades that can achieve all-around uniform cooling, improve product quality, and optimize the demolding process is of significant practical importance.

[0003] To overcome the shortcomings of existing technologies, people have continuously explored and proposed various solutions. For example, a Chinese patent discloses a plastic injection molding mold for ventilation fan blades [Application No.: 201821345796.4], which includes a first mold, a second mold, a first mold frame, and a second mold frame. The second mold is movably connected to one side of the first mold, and the first mold frame is fixedly connected to the other side of the first mold. The second mold frame is fixedly connected to one side of the second mold, and a support frame is provided on one side of the second mold frame. A first groove is fixedly provided on one side surface of the second mold frame, and several sets of the first groove are specifically provided. However, this solution still makes it difficult to uniformly cool the upper and lower surfaces of the plastic fan blades during the cooling process, which can easily lead to inconsistent performance between the upper and lower surfaces of the product, resulting in defects such as deformation and uneven internal stress. Utility Model Content

[0004] The purpose of this invention is to address the above-mentioned problems by providing an injection molding die for plastic fan blades of an automotive cooling fan.

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

[0006] An injection molding die for plastic fan blades of an automotive cooling fan includes a lower mold and an upper mold. An injection main board is located above the upper mold. The lower mold contains a lower fan blade forming seat and a central forming shaft seat. The upper mold contains an upper fan blade forming seat. The lower and upper fan blade forming seats are positioned and shaped accordingly. A central cooling demolding assembly is located below the central forming shaft seat. A lower fan blade cooling component is located within the lower fan blade forming seat, and an upper fan blade cooling component is located within the upper fan blade forming seat. The lower and upper fan blade cooling components are positioned opposite each other.

[0007] In the aforementioned injection molding mold for plastic fan blades of an automotive cooling fan, the central cooling demolding assembly includes several straight push rods disposed below the central molding shaft seat. The straight push rods pass through the central molding shaft seat and slide in cooperation with it. The bottom of the central molding shaft seat is provided with a lower central annular cooling pipe.

[0008] In the aforementioned injection molding mold for plastic fan blades of an automotive cooling fan, the bottom of the lower central annular cooling pipe is provided with a first water inlet pipe and a first water outlet pipe.

[0009] In the aforementioned injection molding mold for plastic fan blades of an automotive cooling fan, the lower fan blade cooling component includes a plurality of lower fan blade cooling pipes disposed within the lower fan blade molding base, and the plurality of lower fan blade cooling pipes are arranged in a ring array along the central molding shaft.

[0010] In the aforementioned injection molding mold for plastic fan blades of an automotive cooling fan, a second water inlet pipe and a second water outlet pipe are provided at the bottom of the cooling pipe at the lower part of the fan blade.

[0011] In the aforementioned injection molding mold for plastic fan blades of an automotive cooling fan, the upper fan blade cooling component includes an upper central annular cooling pipe and several upper fan blade cooling pipes disposed within the upper fan blade forming seat. The several upper fan blade cooling pipes are arranged in a ring array along the central forming shaft seat. The upper fan blade cooling pipes and the lower fan blade cooling pipes are arranged opposite each other, and the upper central annular cooling pipes and the lower central annular cooling pipes are arranged opposite each other.

[0012] In the aforementioned injection molding mold for plastic fan blades of an automotive cooling fan, the top of the upper cooling pipe of the fan blade is provided with a third water inlet pipe and a third water outlet pipe, and the top of the upper central annular cooling pipe is provided with a fourth water inlet pipe and a fourth water outlet pipe.

[0013] In the aforementioned injection molding mold for plastic fan blades of an automotive cooling fan, a fixed frame is provided between the lower fan blade forming base and the upper fan blade forming base.

[0014] In the aforementioned injection molding mold for plastic fan blades of an automotive cooling fan, the bottom of the injection main board is provided with an injection main pipe.

[0015] In the above-mentioned injection molding mold for plastic fan blades of automotive cooling fans, an ejector fixing plate is provided below the lower mold for forming plastic fan blades, and the straight ejector rod is fixedly connected to the ejector fixing plate.

[0016] Compared with existing technologies, the advantages of this utility model are:

[0017] 1. During use, this utility model utilizes a symmetrical all-around cooling water system, with the lower and upper fan blade cooling components precisely corresponding to each other. The central part is also equipped with corresponding annular cooling pipes. During the cooling process, the coolant can simultaneously and evenly act on the upper and lower surfaces and the central area of ​​the plastic fan blades, greatly improving the uniformity of cooling. This effectively reduces problems such as deformation and internal stress concentration caused by cooling differences, significantly improving the uniformity of the upper and lower surfaces and the overall quality of the product.

[0018] 2. The central cooling demolding assembly in this utility model adopts a design with a sliding fit between the straight ejector rod and the central forming shaft seat, and the straight ejector rod is fixedly connected to the ejector fixing plate. Demolding can be easily achieved by pushing the ejector fixing plate with an external power device. This design is not only simple in structure, but also stable and efficient in demolding process, effectively avoiding damage to the product during demolding and improving production efficiency. At the same time, the cooling and demolding processes are independent of each other but work together. The lower central annular cooling pipe does not affect the demolding action of the straight ejector rod while cooling, further optimizing the production process.

[0019] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a partial structural schematic diagram of the present invention.

[0022] Figure 3 This is a partial structural schematic diagram of another aspect of this utility model.

[0023] Figure 4 This is a partial structural schematic diagram of another aspect of this utility model.

[0024] In the diagram: 1. Lower mold for fan plastic blade forming; 2. Upper mold for fan plastic blade forming; 3. Injection main board; 4. Lower base for fan blade forming; 5. Center forming shaft seat; 6. Upper base for fan blade forming; 7. Center cooling demolding assembly; 8. Lower fan blade cooling component; 9. Upper fan blade cooling component; 10. Straight ejector rod; 11. Lower center annular cooling pipe; 12. First water inlet pipe; 13. First water outlet pipe; 14. Lower fan blade cooling pipe; 15. Second water inlet pipe; 16. Second water outlet pipe; 17. Upper fan blade cooling pipe; 18. Third water inlet pipe; 19. Third water outlet pipe; 20. Fixing frame; 21. Main injection pipe; 22. Ejection fixing plate; 100. Upper center annular cooling pipe; 101. Fourth water inlet pipe; 102. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] like Figure 1-4 As shown, an injection molding mold for plastic fan blades of an automotive cooling fan includes a lower mold 1 and an upper mold 2 for forming plastic fan blades. An injection main board 3 is located above the upper mold 2. The lower mold 1 contains a lower fan blade forming seat 4 and a central forming shaft seat 5. The upper mold 2 contains a higher fan blade forming seat 6. The lower fan blade forming seat 4 and the upper fan blade forming seat 6 are positioned and shaped accordingly. A central cooling demolding assembly 7 is located below the central forming shaft seat 5. The lower fan blade forming seat 4 contains a lower fan blade cooling component 8, and the upper fan blade forming seat 6 contains an upper fan blade cooling component 9. The lower fan blade cooling component 8 and the upper fan blade cooling component 9 are positioned opposite each other.

[0027] In this embodiment, during the injection molding process, an injection main plate 3 is provided above the upper mold 2 for forming the fan plastic blades. Its function is to provide a carrier for the injection of plastic raw materials. The plastic raw materials are transported to the mold cavity through the injection main pipe 21. The lower mold 1 for forming the fan plastic blades is provided with a lower fan blade forming seat 4 and a central forming shaft seat 5. The upper mold 2 for forming the fan plastic blades is provided with an upper fan blade forming seat 6. The lower fan blade forming seat 4 and the upper fan blade forming seat 6 are positioned correspondingly and matched in shape. When the upper and lower molds are closed, they are precisely aligned to form a complete and closed plastic fan blade forming space, ensuring the plastic... The material is formed into a predetermined shape within this space. A central cooling demolding assembly 7 is provided below the central forming shaft seat 5. A lower fan blade cooling component 8 is provided in the lower fan blade forming seat 4, and an upper fan blade cooling component 9 is provided in the upper fan blade forming seat 6. The lower fan blade cooling component 8 and the upper fan blade cooling component 9 are arranged opposite each other. This all-round symmetrical cooling structure allows the coolant to uniformly cool the upper and lower surfaces of the molded plastic fan at the same time, effectively improving the uniformity of the upper and lower surfaces of the product, reducing problems such as product deformation and internal stress concentration caused by uneven cooling, and thus improving product quality.

[0028] Combination Figure 1-4 As shown, the central cooling demolding assembly 7 includes several straight push rods 10 disposed below the central forming shaft seat 5. The straight push rods 10 pass through the central forming shaft seat 5 and slide in cooperation with the central forming shaft seat 5. The bottom of the central forming shaft seat 5 is provided with a lower central annular cooling pipe 11.

[0029] Specifically, during the injection molding process, coolant flows from the first inlet pipe 12 into the lower central annular cooling pipe 11, circulates in the pipe, carries away the heat from the central molding shaft 5 and the surrounding plastic, and then flows out from the first outlet pipe 13, continuously cooling the central part to ensure the molding quality of the plastic in the central part. During the demolding stage, the external power device pushes the ejector plate 22 (the straight ejector rod 10 is fixedly connected to the ejector plate 22), which drives the straight ejector rod 10 to move upward, thereby ejecting the molded plastic fan blade from the central molding shaft 5 and completing the demolding operation. The coordinated design of the straight ejector rod 10 and the lower central annular cooling pipe 11 not only ensures the cooling effect but also achieves the non-interference between the cooling and demolding processes, thus improving production efficiency.

[0030] The bottom of the lower central annular cooling pipe 11 is provided with a first water inlet pipe 12 and a first water outlet pipe 13.

[0031] In this embodiment, the first inlet pipe 12 is responsible for introducing low-temperature coolant into the lower central annular cooling pipe 11. The coolant flows in the pipe, absorbs heat from the central molding bearing 5 and the surrounding plastic, and its temperature rises. Then it is discharged through the first outlet pipe 13. This arrangement of inlet and outlet pipes forms a complete coolant circulation system, ensuring that the central molding bearing 5 can be continuously and stably cooled and kept within a suitable temperature range, which is beneficial to improving the stability and quality of the plastic molding in the central part.

[0032] Combination Figure 2 , Figure 4 As shown, the lower fan blade cooling component 8 includes a plurality of fan blade lower cooling pipes 14 disposed in the fan blade forming lower seat 4, and the plurality of fan blade lower cooling pipes 14 are distributed in a ring array along the central forming shaft seat 5.

[0033] In this embodiment, each fan blade lower cooling pipe 14 corresponds to one blade part of the plastic fan blade. This targeted design enables precise cooling of the lower part of the fan blade. Coolant flows into the fan blade lower cooling pipe 14 from the second inlet pipe 15, carries away the heat of the lower part of the fan blade during the flow in the pipe, and then flows out from the second outlet pipe 16, thus achieving cooling of the lower part of the fan blade. Through this array-style cooling pipe layout, the lower part of the fan blade can be cooled evenly, effectively avoiding product deformation or quality problems caused by uneven local cooling, ensuring consistent cooling effect in all parts of the lower part of the fan blade, and improving the overall quality of the product.

[0034] The bottom of the cooling pipe 14 at the lower part of the fan blade is provided with a second water inlet pipe 15 and a second water outlet pipe 16.

[0035] In this embodiment, the second inlet pipe 15 introduces coolant into the cooling pipe 14 at the bottom of the fan blade. The coolant flows in the pipe and exchanges heat with the bottom of the fan blade. After carrying away the heat, it flows out through the second outlet pipe 16. The arrangement of these two pipes forms the coolant circulation path of the cooling pipe 14 at the bottom of the fan blade, ensuring the continuity and stability of cooling the bottom of the fan blade, so that the bottom of the fan blade can be cooled evenly, reducing product defects caused by cooling differences.

[0036] Combination Figure 4 As shown, the upper fan blade cooling component 9 includes a plurality of upper fan blade cooling pipes 17 disposed in the upper fan blade forming seat 6. The plurality of upper fan blade cooling pipes 17 are arranged in a ring array along the central forming shaft seat 5, and the upper fan blade cooling pipes 17 are arranged opposite to the lower fan blade cooling pipes 14.

[0037] In this embodiment, several upper cooling pipes 17 of the fan blades are arranged in a ring array along the central molding shaft seat 5, and the upper cooling pipes 17 and the lower cooling pipes 14 of the fan blades are arranged opposite each other. The upper central annular cooling pipe 100 and the lower central annular cooling pipe 11 are arranged opposite each other. The top of the upper cooling pipes 17 of the fan blades is provided with a third water inlet pipe 18 and a third water outlet pipe 19. Coolant flows in from the third water inlet pipe 18, cools the upper part of the fan blades through the upper cooling pipes 17, and then flows out from the third water outlet pipe 19. The top of the upper central annular cooling pipe 100 is provided with a fourth water inlet pipe 101 and a fourth water outlet pipe 102. The coolant circulation mode is similar to that of the lower central annular cooling pipe 11. This symmetrical cooling pipe design allows the upper and lower surfaces of the plastic fan blades to be uniformly cooled simultaneously during the injection molding process. The corresponding upper and lower cooling pipes work together to further reduce the internal stress of the product, improve the uniformity of the upper and lower surfaces of the product, and improve the product quality.

[0038] The top of the upper cooling pipe 17 of the fan blade is provided with a third water inlet pipe 18 and a third water outlet pipe 19.

[0039] In this embodiment, the third inlet pipe 18 introduces coolant into the upper cooling pipe 17 of the fan blade. After the coolant flows in the pipe and cools the upper part of the fan blade, it flows out from the third outlet pipe 19. The fourth inlet pipe 101 introduces coolant into the upper central annular cooling pipe 100. After the coolant circulates and cools, it flows out from the fourth outlet pipe 102. The arrangement of these inlet and outlet pipes provides independent and complete coolant circulation channels for the upper cooling pipe 17 and the upper central annular cooling pipe 100 of the fan blade, respectively, ensuring a stable and reliable cooling effect on the upper and central parts of the fan blade, thereby ensuring product quality.

[0040] Combination Figure 1-3 As shown, a fixed frame 20 is provided between the fan blade forming lower seat 4 and the fan blade forming upper seat 6.

[0041] In this embodiment, the fixed frame 20 plays a key role in stabilizing the upper and lower seat structures. During the injection and cooling process, it can effectively prevent the lower fan blade forming seat 4 and the upper fan blade forming seat 6 from displacement or deformation due to external forces or temperature changes. It ensures the relative position of the upper and lower seats is stable during the working process, so that the mold cavity always maintains the precise shape and size, avoids affecting product quality due to mold deformation, and improves the service life of the mold and the consistency of the product.

[0042] Combination Figure 1-2 As shown, the injection molding main board 3 has an injection molding main tube 21 at its bottom.

[0043] In this embodiment, the injection main pipe 21 serves as a channel for plastic raw materials to enter the mold cavity from the injection main plate 3. It accurately injects the plastic raw materials in the injection main plate 3 into the molding space formed by the fan blade forming lower seat 4 and the fan blade forming upper seat 6. Its reasonable pipe diameter and structural design ensure that the plastic raw materials can fill the mold cavity at a suitable flow rate and pressure, ensuring that the plastic is evenly distributed in the cavity and providing a guarantee for the molding quality of the product.

[0044] Combination Figure 1 As shown, an ejector fixing plate 22 is provided below the lower mold 1 for forming the plastic fan blades, and the straight ejector rod 10 is fixedly connected to the ejector fixing plate 22.

[0045] In this embodiment, the movement of the straight ejector rod 10 can be conveniently and efficiently controlled by an external power device acting on the ejector fixing plate 22. During demolding, the ejector fixing plate 22 drives the straight ejector rod 10 to move upward, ejecting the molded plastic fan blade from the central molding shaft seat 5, thus achieving efficient demolding. The setting of the ejector fixing plate 22 enhances the stability and accuracy of the movement control of the straight ejector rod 10, and improves the reliability and production efficiency of the demolding process.

[0046] The working principle of this utility model is as follows:

[0047] The mold is installed on the injection molding machine, and the machine is started. Plastic raw material is injected through the injection main pipe 21 at the bottom of the injection main plate 3 into the molding space composed of the lower fan blade forming seat 4 and the upper fan blade forming seat 6. At this time, the central cooling demolding assembly 7, the lower fan blade cooling component 8, and the upper fan blade cooling component 9 begin to work. Coolant flows into the corresponding cooling pipes from the first water inlet pipe 12, the second water inlet pipe 15, the third water inlet pipe 18, and the fourth water inlet pipe 101, respectively, cooling the center, lower, and upper parts of the plastic fan blades. During the cooling process, the symmetrical cooling pipe design ensures uniform cooling of the upper and lower surfaces of the plastic fan blades, resulting in uniform internal stress distribution and improved uniformity and quality of the product's upper and lower surfaces. After the plastic fan blades have cooled and formed, an external power device pushes the ejector plate 22, which in turn drives the straight ejector rod 10 upward to eject the formed plastic fan blades from the central forming shaft seat 5, completing the demolding process. Throughout the process, the fixed frame 20 ensures the relative position stability of the fan blade forming lower seat 4 and the fan blade forming upper seat 6, ensuring product quality. The ingenuity of this invention lies in the innovative design of a symmetrical all-around cooling water system. This unique design effectively solves the problem of uneven cooling in traditional molds, improving product quality and production efficiency. At the same time, the ingenious design of the central cooling demolding component 7 enables the cooling and demolding processes to be carried out in a coordinated and efficient manner, further optimizing the production process.

[0048] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model.

[0049] Although this document frequently uses terms such as fan plastic blade forming lower mold 1, fan plastic blade forming upper mold 2, injection molding main board 3, fan blade forming lower seat 4, center forming shaft seat 5, fan blade forming upper seat 6, center cooling demolding assembly 7, lower fan blade cooling component 8, upper fan blade cooling component 9, straight ejector rod 10, lower center annular cooling pipe 11, first water inlet pipe 12, first water outlet pipe 13, lower fan blade cooling pipe 14, second water inlet pipe 15, second water outlet pipe 16, upper fan blade cooling pipe 17, third water inlet pipe 18, third water outlet pipe 19, fixing frame 20, injection molding main pipe 21, ejection fixing plate 22, upper center annular cooling pipe 100, fourth water inlet pipe 101, and fourth water outlet pipe 102, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A molding die for injection molding plastic fan blades of an automotive cooling fan, comprising a lower mold (1) for molding plastic fan blades and an upper mold (2) for molding plastic fan blades, characterized in that, The upper mold (2) for forming the plastic fan blades is provided with an injection molding main board (3). The lower mold (1) for forming the plastic fan blades is provided with a lower fan blade forming seat (4) and a central forming shaft seat (5). The upper mold (2) for forming the plastic fan blades is provided with an upper fan blade forming seat (6). The lower fan blade forming seat (4) and the upper fan blade forming seat (6) are positioned correspondingly and have matching shapes. The central forming shaft seat (5) is provided with a central cooling demolding assembly (7). The lower fan blade forming seat (4) is provided with a lower fan blade cooling component (8). The upper fan blade forming seat (6) is provided with an upper fan blade cooling component (9). The lower fan blade cooling component (8) and the upper fan blade cooling component (9) are positioned opposite each other.

2. The injection molding die for automotive cooling fan plastic blades according to claim 1, characterized in that, The central cooling demolding assembly (7) includes several straight push rods (10) disposed below the central forming shaft seat (5). The straight push rods (10) pass through the central forming shaft seat (5) and slide in cooperation with the central forming shaft seat (5). The bottom of the central forming shaft seat (5) is provided with a lower central annular cooling pipe (11).

3. The injection molding die for automotive cooling fan plastic blades according to claim 2, characterized in that, The bottom of the lower central annular cooling pipe (11) is provided with a first water inlet pipe (12) and a first water outlet pipe (13).

4. The injection molding die for automotive cooling fan plastic blades according to claim 3, characterized in that, The lower fan blade cooling component (8) includes several fan blade lower cooling pipes (14) disposed in the fan blade forming lower seat (4), and the several fan blade lower cooling pipes (14) are arranged in a ring array along the central forming shaft seat (5).

5. The injection molding die for automotive cooling fan plastic blades according to claim 4, characterized in that, The bottom of the cooling pipe (14) at the lower part of the fan blade is provided with a second water inlet pipe (15) and a second water outlet pipe (16).

6. The injection molding die for automotive cooling fan plastic blades according to claim 5, characterized in that, The upper fan blade cooling component (9) includes an upper central annular cooling pipe (100) and several upper fan blade cooling pipes (17) disposed in the upper fan blade forming seat (6). The several upper fan blade cooling pipes (17) are arranged in a ring array along the central forming shaft seat (5). The upper fan blade cooling pipes (17) and the lower fan blade cooling pipes (14) are arranged opposite each other, and the upper central annular cooling pipe (100) and the lower central annular cooling pipe (11) are arranged opposite each other.

7. The injection molding die for automotive cooling fan plastic blades according to claim 6, characterized in that, The upper cooling pipe (17) of the fan blade is provided with a third water inlet pipe (18) and a third water outlet pipe (19) at the top, and the upper central annular cooling pipe (100) is provided with a fourth water inlet pipe (101) and a fourth water outlet pipe (102) at the top.

8. The injection molding die for automotive cooling fan plastic blades according to claim 7, characterized in that, A fixed frame (20) is provided between the fan blade forming lower seat (4) and the fan blade forming upper seat (6).

9. The injection molding die for automotive cooling fan plastic blades according to claim 8, characterized in that, The injection molding main board (3) is provided with an injection molding main pipe (21) at the bottom.

10. The injection molding die for automotive cooling fan plastic blades according to claim 9, characterized in that, The lower mold (1) for forming plastic fan blades is provided with an ejector fixing plate (22), and the straight ejector rod (10) is fixedly connected to the ejector fixing plate (22).

Images