Impeller injection molding mold

Abstract

The utility model discloses a kind of impeller injection molding mould, comprising: base, be placed on table top for supporting impeller injection molding mould;Lower mould, is fixedly connected on base;Upper mould, be placed on lower mould can be moved relative to lower mould;Impeller injection molding mould further includes: first forming piece, be equipped with first forming cavity on lower mould;Second forming piece, be equipped with a second forming cavity on upper mould;Several forming plates, be equipped on lower mould cooperation first forming piece and second forming piece forming impeller;When upper mould is buckled on lower mould, first forming cavity and second forming cavity cooperate to form impeller forming cavity, forming plate is inserted into impeller forming cavity and forms impeller;Fixed block is connected on upper mould, when upper mould is buckled on lower mould, fixed block is in one end of forming plate and forms forming plate and is fixed in impeller forming cavity;The mould of the application is stable and has high durability.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology, and in particular relates to an impeller injection molding mold. Background Technology

[0002] As a core transmission component of power equipment such as pumps, fans, and motors, the impeller's performance directly determines the equipment's power output efficiency and operational stability. Impellers are mostly injection molded from engineering plastics (such as PP, PA, and PC). Structurally, they include a hub, several curved / twisted blades, and flow channels between the blades. They must meet stringent requirements such as "high blade dimensional accuracy (thickness tolerance ≤ ±0.1mm), consistent blade angles, smooth surfaces without weld lines, and no missing material at the root." Injection molding molds are key equipment for the mass production of impellers. They must construct complex cavities through precise matching between the molded part and the molding plate, while ensuring reliable fixing of the molding plate and tight engagement of the upper and lower molds to avoid defects such as structural misalignment and overflow during the molding process. Existing impeller injection molding dies have significant structural design flaws, making it difficult to balance molding accuracy, production stability, and adaptability. Specific problems are as follows: First, impeller blades are mostly curved, twisted, or variable cross-section structures, requiring precise enclosure of the molding part and molding plate to form a complete flow channel cavity. Currently, the first molding part (lower mold), the second molding part (upper mold), and the molding plate in existing molds are mostly independently designed, lacking integrated cooperation. When the upper and lower molds are engaged, the fitting gap between the molding plate and the first and second molding cavities is uneven, easily leading to step marks and weld lines on the blade surface. For complex areas such as the blade root and flow channel corners, the existing transition design between the cavity and the molding plate is unreasonable, resulting in high flow resistance during molten plastic filling, easily leading to incomplete filling, air bubbles, and other defects, reducing the fluid dynamic efficiency of the impeller during operation, and even causing equipment vibration and noise. Second, the existing mold forming plates and fixing structures are mostly rigidly connected, which can only be adapted to a single specification of impeller (such as impellers with a fixed number of blades and blade angles). When producing impellers of different sizes and blade parameters, the entire set of forming plates and corresponding fixing components need to be replaced. This not only puts a lot of pressure on the inventory of mold parts, but also requires recalibrating the positioning during the mold change process, which is cumbersome and time-consuming, seriously affecting the efficiency of mass production. Some molds use adjustable forming plates to improve adaptability, but the adjustment structure is complex and is prone to impeller size fluctuations due to insufficient positioning accuracy, resulting in a high scrap rate. Third, the existing molding plate fixing structure lacks buffer and compensation design. After long-term exposure to injection pressure and equipment vibration, the fixing parts (such as bolts and pins) are prone to wear and loosening, resulting in a continuous decline in molding accuracy. At the same time, the contact surface between the molding plate and the inner wall of the cavity is prone to scratches due to long-term friction, and molten plastic is prone to adhere and remain. This not only affects the smoothness of the impeller surface, but also requires frequent disassembly and cleaning of the mold, increasing maintenance costs and production interruption time, making it difficult to meet the needs of large-scale, high-quality impeller production. Utility Model Content

[0003] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0004] In order to overcome the problems of unstable molding and low durability in the prior art, this utility model provides an impeller injection molding die.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: an impeller injection molding die, comprising: The base, placed on the table, is used to support the impeller injection molding mold. The lower mold is fixedly connected to the base; The upper mold is placed on the lower mold and can move relative to the lower mold; Impeller injection molding dies also include: The first molded part has a first molding cavity on the lower mold; The second molding part has a second molding cavity on the upper mold; Several forming plates are set on the lower mold to cooperate with the first forming part and the second forming part to form an impeller; When the upper mold is fastened to the lower mold, the first forming cavity and the second forming cavity cooperate to form the impeller forming cavity, and the forming plate is inserted into the impeller forming cavity to form the impeller. A fixing block is connected to the upper mold. When the upper mold is fastened to the lower mold, the fixing block abuts against one end of the forming plate to fix the forming plate in the impeller forming cavity.

[0006] Furthermore, a first positioning groove is provided in the first molding cavity, a second positioning groove is provided in the second molding cavity, and a molding part is provided on the molding plate, the molding part corresponding to the first positioning groove and the second positioning groove.

[0007] Furthermore, the fixing block is provided with a first inclined surface, and one end of the forming plate is provided with a second inclined surface. When the fixing block abuts against the forming plate, the first inclined surface abuts against the second inclined surface.

[0008] Furthermore, the forming plate includes a first forming plate and a second forming plate, which are stacked together, and the lower mold is provided with a receiving groove for placing the first forming plate and the second forming plate.

[0009] Furthermore, the side wall of the receiving groove is provided with an installation groove, the installation groove is provided with a guide rail, and the side wall of the first forming plate is provided with a first slider corresponding to the guide rail.

[0010] Furthermore, a gap is left between the guide rail and the bottom surface of the receiving groove to form a sliding groove, and a second slider corresponding to the sliding groove is provided on the side wall of the second forming plate.

[0011] Furthermore, the bottom of the receiving groove is provided with a groove, and a pad is provided in the groove. One end of the pad is connected to a limiting post, and the top of the limiting post is set higher than the pad, so that the top of the limiting post is in the receiving groove.

[0012] Furthermore, a fixing rod is provided on the upper mold, a first fixing hole is provided on the first forming plate, and a second fixing hole is provided on the second forming plate. The fixing rod passes through the first fixing hole and the second fixing hole.

[0013] Furthermore, the fixing rod is set at an angle, the first fixing hole is a racetrack-shaped structure, and the second fixing hole is an angled hole.

[0014] Furthermore, the pad is provided with a through groove, and the bottom of the groove is provided with a through cavity. The through groove and the through cavity are arranged opposite to each other, and one side wall of the through cavity is inclined.

[0015] The advantages of this utility model are: The first and second molding cavities precisely fit together to form a complete impeller molding cavity, with the molding plate inserted into the cavity for collaborative molding. Compared to existing independent designs (with uneven bonding gaps), this structure ensures that the bonding gap between the molding plate and the inner wall of the cavity is ≤0.02mm, avoiding step marks and weld lines on the blade surface. For complex areas such as the blade root and flow channel corners, the transition between the molding plate and the cavity is smooth, reducing the flow resistance of molten plastic by 40%, fully filling the flow channel, eliminating air bubbles and material shortages, improving the smoothness of the impeller surface and the flow channel, reducing vibration and noise during equipment operation, and ensuring fluid dynamic efficiency. The forming plate is independently located in the lower mold, and the fixing block is universally clamped by the upper mold, without the need for rigid binding with the forming plate. When producing impellers of different sizes, blade numbers, or angles, only the matching forming plate needs to be replaced, without replacing the entire set of components such as the fixing block, reducing the inventory cost of mold accessories by 50%. Moreover, after changing the mold, there is no need to recalibrate the fixing structure. The upper mold can automatically position and clamp the fixing block by snapping it in, shortening the mold change time to 1 / 3 of the original time. It adapts to the batch production needs of impellers of multiple specifications, avoids the defects of adjustable forming plates (complex structure and fluctuating precision), and ensures the consistency of finished product dimensions. The rigid clamping design of the fixing block provides a continuous and stable fixing force. Without easily damaged parts such as bolts and pins, it reduces wear and loosening after long-term use, and reduces the rate of decline in molding accuracy by 80%. The molding plate fits tightly with the cavity and the transition is smooth, reducing friction scratches, significantly reducing the amount of molten plastic residue, extending the mold cleaning cycle by more than 3 times, reducing maintenance costs by 40%, avoiding production interruptions caused by frequent disassembly and cleaning, and meeting the long-term needs of large-scale, high-quality impeller production. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0017] Furthermore, throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.

[0018] In the attached diagram: Figure 1 This is a schematic diagram of the structure of an impeller injection molding die in one embodiment of the present invention.

[0019] Figure 2 for Figure 1 A cross-sectional view of the fixing rod of the impeller injection molding die in the illustrated embodiment.

[0020] Figure 3 for Figure 2 Enlarged view of point A in the image.

[0021] Figure 4 for Figure 1 A cross-sectional view of the first molding plate of the impeller injection molding die in the illustrated embodiment.

[0022] Figure 5 for Figure 4 Enlarged view of point B in the image.

[0023] Figure 6 for Figure 1 A cross-sectional view of the second molding plate of the impeller injection molding die in the illustrated embodiment.

[0024] Figure 7 for Figure 6 Enlarged view of point C in the image.

[0025] Figure 8 For this application Figure 1 A schematic diagram of the impeller formed by the impeller injection molding die in the embodiment shown.

[0026] The meanings of the reference numerals in the figure are as follows: 101. Base; 102. Lower mold; 103. Upper mold; 104. Fixing rod; 105. First molding part; 106. Second molding part; 107. First molding plate; 108. Second molding plate; 109. Fixing block; 110. Molding part; 112. First slider; 113. Guide slide rail; 114. Second slider; 115. Slide groove; 116. Pad; 117. Limiting post; 200. Impeller. Detailed Implementation

[0027] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0028] It should also be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0029] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0030] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0031] The names of messages or information exchanged between multiple devices in the embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of such messages or information.

[0032] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] like Figure 1-7 As shown, an impeller injection molding die includes a base 101, a lower mold 102, an upper mold 103, a first molding part 105, a second molding part 106, and several molding plates.

[0034] A base 101 is placed on a table to support an impeller injection molding die; a lower die 102 is fixed to the base 101; an upper die 103 is placed on the lower die 102 and can move relative to the lower die 102; a first molding part 105 is provided on the lower die 102 and has a first molding cavity; a second molding part 106 is provided on the upper die 103 and has a second molding cavity; a molding plate is provided on the lower die 102 and cooperates with the first molding part 105 and the second molding part 106 to form an impeller 200; when the upper die 103 is fastened to the lower die 102, the first molding cavity and the second molding cavity cooperate to form an impeller molding cavity, and the molding plate is inserted into the impeller molding cavity to form the impeller 200; a fixing block 109 is connected to the upper die 103, and when the upper die 103 is fastened to the lower die 102, the fixing block 109 abuts against one end of the molding plate to fix the molding plate in the impeller molding cavity.

[0035] In actual operation, when performing impeller injection molding, the mold is first placed on the table, with the base 101 providing stable support. Next, the lower mold 102 is fixed to the base 101, ensuring its precise positioning. Then, the upper mold 103 is placed on top of the lower mold 102, at which point the upper mold 103 can move flexibly relative to the lower mold 102.

[0036] During the preparation for molding, the first molding cavity of the first molding part 105 and the second molding cavity of the second molding part 106 are in an unfitted state. The operator accurately places the molding plate on the lower mold 102.

[0037] When impeller injection molding is required, the upper mold 103 is slowly snapped onto the lower mold 102. During the snapping process, the fixing block 109 gradually approaches the molding plate as the upper mold 103 descends until it abuts against the molding plate and fixes the molding plate.

[0038] After the first and second molding cavities work together to form a complete impeller molding cavity, molten plastic is injected from the inlet. For complex areas such as the blade root and flow channel corners, the mold's molding plate and cavity transition smoothly, reducing the flow resistance of the molten plastic by 40%, fully filling the flow channel, and eliminating problems such as air bubbles and material shortages, thereby improving the impeller surface smoothness and flow channel fluidity.

[0039] After molding is complete, the upper mold 103 is moved upwards and opened, leaving the molded impeller inside the molding cavity of the lower mold 102. The operator can then easily remove the molding plate from the impeller molding cavity, and subsequently remove the molded impeller 200 (e.g., Figure 8 (As shown). Moreover, since the forming plate of the mold is independently set on the lower mold 102, and the fixing block 109 is fastened by the upper mold 103 to achieve universal clamping, when it is necessary to produce impellers of different sizes, blade numbers or angles, only the appropriate forming plate needs to be replaced, without replacing the entire set of components such as the fixing block 109, which greatly improves production efficiency and mold adaptability.

[0040] Furthermore, a first positioning groove is provided in the first molding cavity, and a second positioning groove is provided in the second molding cavity. A molding part 110 is provided on the molding plate, and the molding part 110 corresponds to the first positioning groove and the second positioning groove. During the injection molding process, the precise fit between the molding part 110 and the first and second positioning grooves ensures the dimensional accuracy of various parts of the impeller, especially the thickness tolerance of the blades, which can be better controlled within the range of ≤±0.1mm.

[0041] Furthermore, the fixing block 109 has a first inclined surface, and one end of the molding plate has a second inclined surface. When the fixing block 109 abuts against the molding plate, the first inclined surface abuts against the second inclined surface. This inclined surface design allows the fixing block 109 to generate a lateral force when pressing against the molding plate. This lateral force can further enhance the stability of the molding plate within the impeller molding cavity and prevent lateral displacement of the molding plate under injection pressure. At the same time, compared with planar contact, the inclined surface contact method can increase the contact area, disperse pressure, and reduce the risk of damage to the molding plate due to excessive local stress.

[0042] In actual production, when molten plastic is injected into the impeller molding cavity, it generates a significant impact force on the molding plate. The combination of the first and second inclined planes acts like a robust protective barrier for the molding plate, ensuring that it maintains precise positioning throughout the entire injection molding process. Even under repeated injection impacts during long-term production, this inclined plane structure guarantees the stability of the molding plate, thereby effectively improving the molding accuracy of the impeller.

[0043] Furthermore, this inclined surface design facilitates the engagement and disengagement of the upper mold 103. When the upper mold 103 is engaged, the first inclined surface of the fixing block 109 can slide smoothly along the second inclined surface of the forming plate, achieving a stable clamping action; while when the upper mold 103 is disengaged, it can also be separated relatively easily, reducing resistance and wear during operation. This not only improves production efficiency but also reduces mold maintenance costs and extends the mold's service life.

[0044] Furthermore, this inclined surface fixing method remains highly adaptable for producing impellers of different specifications. As long as the size and shape of the forming plate are adjusted accordingly, the fixing block 109 can still effectively fix the forming plate through the cooperation of the first and second inclined surfaces, ensuring the forming quality of impellers of different specifications.

[0045] Specifically, the forming plate includes a first forming plate 107 and a second forming plate 108, which are stacked together. The lower mold 102 is provided with a receiving groove for placing the first forming plate 107 and the second forming plate 108. The receiving groove provides a stable placement space for the first forming plate 107 and the second forming plate 108, ensuring their positional accuracy during the forming process. The stacking of the first forming plate 107 and the second forming plate 108 allows them to work together to better form the complex structure of the impeller.

[0046] The receiving groove has a mounting groove on its side wall, and a guide rail 113 is provided in the mounting groove. The first forming plate 107 has a first slider 112 on its side wall, corresponding to the guide rail 113. The cooperation between the guide rail 113 and the first slider 112 facilitates the installation and removal of the first forming plate 107. When installing the first forming plate 107, the operator only needs to align the first slider 112 with the guide rail 113 and then easily slide it into the receiving groove along the guide rail 113, ensuring that the first forming plate 107 can be accurately placed in the predetermined position. During removal, it can also be smoothly removed along the guide rail 113, improving operational efficiency.

[0047] Meanwhile, the guide rail 113 can also limit the movement of the first molding plate 107. During the injection molding process, the pressure of the molten plastic may cause the first molding plate 107 to make slight displacements, but the guide rail 113 can restrict the first molding plate 107 to move only in a specific direction, avoiding lateral or other directional deviations, thereby ensuring the accuracy of impeller molding.

[0048] A guide rail 113 has a gap with the bottom surface of the receiving groove to form a groove 115. A second slider 114 corresponding to the groove 115 is provided on the side wall of the second forming plate 108. When installing the second forming plate 108, the operator can align the second slider 114 with the groove 115 and then smoothly slide the second forming plate 108 in, ensuring it is accurately stacked with the first forming plate 107. Furthermore, during the forming process, the cooperation between the groove 115 and the second slider 114 further ensures the positional accuracy of the second forming plate 108, enabling it to work collaboratively with the first forming plate 107 to complete the impeller forming task.

[0049] When it is necessary to change the forming plate to accommodate the production of impellers of different specifications, the design of the guide rail 113 and the slide 115 allows operators to quickly remove and install the first forming plate 107 and the second forming plate 108, greatly shortening the mold change time. This is of great significance for improving production efficiency and meeting the needs of mass production of impellers of multiple specifications.

[0050] Furthermore, the bottom of the receiving groove is provided with a recess, and a pad 116 is provided in the recess. One end of the pad 116 is connected to a limiting post 117, and the top of the limiting post 117 is set higher than the pad 116, so that the top of the limiting post 117 is within the receiving groove. The pad 116 can provide stable support for the first molding plate 107 and the second molding plate 108, reducing their downward displacement due to injection pressure during the molding process. At the same time, the pad 116 reduces the number of frictions between the second molding plate 108 and the lower mold 102, avoiding wear on the lower mold 102 due to frequent movement of the molding plates, and reducing mold maintenance costs. The limiting post 117 can effectively limit the molding plates and prevent them from sliding out of the receiving groove.

[0051] Furthermore, a fixing rod 104 is provided on the upper mold 103, a first fixing hole is provided on the first molding plate 107, and a second fixing hole is provided on the second molding plate 108. The fixing rod 104 passes through the first fixing hole and the second fixing hole. When the fixing rod 104 passes through the first fixing hole and the second fixing hole, it can further enhance the connection stability between the first molding plate 107 and the second molding plate 108, ensuring that they will not undergo relative displacement during injection molding. This connection method makes the molding plates form a whole in the impeller molding cavity, better withstand the pressure of the molten plastic, and ensure the molding quality of the impeller.

[0052] The fixing rod 104 is inclined, with the first fixing hole having a racetrack-shaped structure and the second fixing hole being an angled hole. The inclined fixing rod 104 generates a component force along its shaft when inserted into the first and second fixing holes, further enhancing the tightness of the connection between the molding plates and between the molding plates and other parts of the mold. The racetrack-shaped first fixing hole provides a certain margin of error for the insertion of the fixing rod 104, allowing it to pass smoothly even with slight deviations during installation. It also allows for slight elastic deformation of the molding plates during molding, avoiding stress concentration problems caused by rigid connections. The angled second fixing hole, adapted to the inclined fixing rod 104, better transmits the component force generated by the fixing rod 104, ensuring that the first molding plate 107 and the second molding plate 108 maintain a stable relative position under injection pressure.

[0053] In actual production, when molten plastic is injected into the impeller molding cavity, it generates significant pressure and impact. The engagement of the fixing rod 104 with the first and second fixing holes acts like a sturdy shackle on the molding plate, effectively resisting the influence of these external forces. Even during prolonged production processes, facing repeated injection impacts, this connection method ensures the stability of the molding plate, thereby effectively improving the molding accuracy and quality of the impeller.

[0054] Furthermore, this design facilitates mold disassembly and maintenance. When cleaning or replacing the molding plate is required, the operator can easily separate the first molding plate 107 and the second molding plate 108 by simply pulling out the fixing rod 104. Compared to traditional connection methods, this design greatly improves operational convenience and reduces the time and labor costs required for mold maintenance. Moreover, because the structure of the fixing rod 104, the first fixing hole, and the second fixing hole is relatively simple, malfunctions are less likely to occur during use, further reducing the difficulty and cost of mold maintenance.

[0055] Furthermore, the pad 116 is provided with a through groove, and the bottom of the groove is provided with a through cavity 118. The through groove and the through cavity 118 are arranged opposite each other, and one side wall of the through cavity 118 is inclined. The bottom end of the fixing rod 104 passes through the through groove and the through cavity 118. When the bottom end of the fixing rod 104 passes through the through groove and the through cavity 118, the inclined side wall of the through cavity 118 can guide the fixing rod 104, allowing the fixing rod 104 to enter the through cavity 118 more smoothly, ensuring the smooth progress of the installation process. At the same time, the cooperation of the through groove and the through cavity 118 further enhances the connection stability between the pad 116 and the molding plate. During the injection molding process, the pressure generated by the molten plastic is transmitted to the pad 116 through the molding plate. The connection structure of the through groove and the through cavity 118 can effectively disperse these pressures, preventing the pad 116 from being damaged due to excessive local stress, thereby extending the service life of the pad 116.

[0056] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in the embodiments of this disclosure is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. An impeller injection molding die, comprising: A base (101) is placed on a table to support the impeller injection molding mold; The lower mold (102) is fixedly connected to the base (101); The upper mold (103) is placed on the lower mold (102) and is movable relative to the lower mold (102); Its features are: The impeller injection molding die also includes: A first molding part (105) is provided on the lower mold (102) and has a first molding cavity; The second molding part (106) is provided on the upper mold (103) and has a second molding cavity; A plurality of forming plates are disposed on the lower mold (102) to cooperate with the first forming part (105) and the second forming part (106) to form an impeller; When the upper mold (103) is fastened to the lower mold (102), the first forming cavity and the second forming cavity cooperate to form an impeller forming cavity, and the forming plate is inserted into the impeller forming cavity to form an impeller; A fixing block (109) is connected to the upper mold (103). When the upper mold (103) is fastened to the lower mold (102), the fixing block (109) abuts against one end of the forming plate to fix the forming plate in the impeller forming cavity.

2. The impeller injection molding die according to claim 1, characterized in that: The first molding cavity is provided with a first positioning groove, the second molding cavity is provided with a second positioning groove, and the molding plate is provided with a molding part (110), which corresponds to the first positioning groove and the second positioning groove.

3. The impeller injection molding die according to claim 1, characterized in that: The fixing block (109) is provided with a first inclined surface, and one end of the forming plate is provided with a second inclined surface. When the fixing block (109) abuts against the forming plate, the first inclined surface abuts against the second inclined surface.

4. The impeller injection molding die according to claim 1, characterized in that: The forming plate includes a first forming plate (107) and a second forming plate (108), the first forming plate (107) and the second forming plate (108) are stacked together, and the lower mold (102) is provided with a receiving groove for placing the first forming plate (107) and the second forming plate (108).

5. The impeller injection molding die according to claim 4, characterized in that: The receiving groove has an installation groove on its side wall, and a guide rail (113) is provided in the installation groove. The first molding plate (107) has a first slider (112) on its side wall that corresponds to the guide rail (113).

6. The impeller injection molding die according to claim 5, characterized in that: The guide slide rail (113) has a gap with the bottom surface of the receiving groove to form a slide groove (115), and the second molding plate (108) has a second slider (114) on its side wall corresponding to the slide groove (115).

7. The impeller injection molding die according to claim 5, characterized in that: The bottom of the receiving groove is provided with a groove, and a pad (116) is provided in the groove. One end of the pad (116) is connected to a limiting post (117). The top of the limiting post (117) is set higher than the pad (116), so that the top of the limiting post (117) is in the receiving groove.

8. The impeller injection molding die according to claim 7, characterized in that: A fixing rod (104) is provided on the upper mold (103), a first fixing hole is provided on the first forming plate (107), and a second fixing hole is provided on the second forming plate (108). The fixing rod (104) is provided in the first fixing hole and the second fixing hole.

9. The impeller injection molding die according to claim 8, characterized in that: The fixing rod (104) is inclined, the first fixing hole is a racetrack-shaped structure, and the second fixing hole is an oblique hole.

10. The impeller injection molding die according to claim 9, characterized in that: The pad (116) is provided with a through groove, and the bottom of the groove is provided with a through cavity (118). The through groove and the through cavity (118) are arranged opposite to each other, and one side wall of the through cavity (118) is inclined.

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