Vacuum adsorption type ultrathin fan blade injection molding jig

Abstract

The invention relates to the technical field of injection molding jigs, in particular to a vacuum adsorption type ultrathin fan blade injection molding jig which comprises a supporting plate, a rotary table is rotationally installed on the supporting plate, a rotary ring is installed on the outer portion of the rotary table in a front-back sliding mode, and a plurality of male dies which are evenly distributed in the circumferential direction are fixedly connected to the front side of the rotary ring. The supporting plate is provided with a driving unit used for driving the rotary table to rotate and a guiding unit used for driving the rotating ring to move backwards when the rotary table rotates. The adsorption holes and the micro-porous film are arranged on the inner wall of the die cavity, and in the fan blade cooling forming process, the adsorption holes and the micro-porous film generate negative pressure to adsorb the fan blade, so that the blade is always attached to the side, close to the micro-porous film, of the cavity, the condition that the blade warps during forming is avoided, and the service life of the blade is prolonged. And during mold opening, the adsorption holes and the microporous membrane are kept in a vacuum adsorption state, so that the fan blades are prevented from being pulled during mold opening of the fixed mold template, and bending deformation of the fan blades is avoided.

Description

Technical Field

[0001] This invention relates to the field of injection molding fixture technology, specifically to a vacuum adsorption type ultra-thin fan blade injection molding fixture. Background Technology

[0002] Ultra-thin fan blades refer to fan blades that are relatively thin and can achieve efficient heat dissipation or ventilation within a limited space. Laptop fans are a type of ultra-thin fan blade. Ultra-thin fan blades can provide effective heat dissipation for heat-generating components such as chips without increasing the overall size. When manufacturing ultra-thin fan blades, while achieving extreme thinning (typically <0.5mm, and <0.1mm in some scenarios), the structural strength, dynamic balance accuracy, and aerodynamic performance of the blades must be maintained to avoid deformation, breakage, or dimensional deviations during the manufacturing process.

[0003] Ultra-thin fan blades are generally manufactured using injection molding. During the manufacturing process, as the molten plastic cools and shrinks, the ultra-thin fan blades may separate from the inner wall of the mold cavity. However, due to the thin wall thickness of the ultra-thin fan blades, their inherent support and stability are insufficient, making them prone to warping during the cooling process. Warping is one of the most common and critical defects affecting performance. It manifests as the finished blades bending, twisting, or deforming in ways not intended by the design, directly leading to fan dynamic balance failure, increased noise, reduced airflow, and even vibration damage during operation. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a vacuum adsorption type ultra-thin fan blade injection molding fixture, comprising a support plate, a turntable rotatably mounted on the support plate, a rotating ring slidably mounted on the outside of the turntable, a plurality of circumferentially evenly distributed punches fixedly connected to the front side of the rotating ring, and a drive unit for driving the turntable to rotate and a guide unit for driving the rotating ring to move backward when the turntable rotates, all mounted on the support plate.

[0005] A moving mold template is installed on the front side of the support plate. The moving mold template has mold grooves that are evenly distributed circumferentially and can be inserted into the punch. An adsorption unit is installed on the moving mold template. The adsorption unit includes a number of adsorption holes that are opened inside the moving mold template and communicate with the mold grooves. A microporous membrane is fixedly installed on the side wall of the mold groove. An adsorption component for evacuating the adsorption holes is installed inside the moving mold template.

[0006] A fixed mold template installed on the front side of the moving mold template and used in conjunction with it.

[0007] In one possible implementation, the turntable is a double-layered frustum structure, the rotating ring is slidably mounted on the step on the front side of the turntable, and an elastic telescopic rod is installed between the rear side of the rotating ring and the step on the rear side of the turntable.

[0008] In one possible implementation, the drive unit includes a gear ring fixedly mounted on the rear step of the turntable. The support plate has symmetrically distributed slides on the left and right sides of the turntable. A rack is slidably installed inside the slide, and the rack meshes with the gear ring. Sealing rings for sealing the gap between the rack and the slide are installed at both the upper and lower ends of the rack. An air inlet and outlet port corresponding to and communicating with the slide is installed on the top of the support plate.

[0009] In one possible implementation, the guiding unit includes a plurality of guide grooves formed on the inner ring wall of the support plate and evenly distributed circumferentially, and guide blocks corresponding to the guide grooves are fixedly connected to the outer ring wall of the rotating ring, and the guide blocks are slidably connected to the corresponding guide grooves.

[0010] In one possible implementation, the mold groove and the punch are interlocked to form a cavity for injection molding fan blades, the microporous membrane is located on the inner wall of the cavity in the counterclockwise direction, and the punch is inclined on the clockwise side and slides in cooperation with the mold groove.

[0011] In one possible implementation, the adsorption assembly includes an annular air passage formed inside the moving mold template and surrounding the outside of several mold slots. The inner side of the annular air passage is connected to several circumferentially evenly distributed branch air passages. The branch air passages are located between two adjacent mold slots and are connected to the corresponding adsorption holes. A vent valve and a vacuum valve connected to the annular air passages are fixedly installed on the top of the moving mold template.

[0012] In one possible implementation, a through hole is provided in the middle of the moving mold template, and the front step of the turntable is slidably inserted into the through hole. An annular groove for connecting several mold slots is provided on the front side of the moving mold template.

[0013] In one possible implementation, the fixed mold template has a first injection port in the middle, and the fixed mold template has a plurality of second injection ports evenly distributed around the injection port in a circumferential direction. The rear end of the second injection port is connected to the portion of the annular groove located between two adjacent mold grooves.

[0014] The beneficial effects of this invention are as follows: 1. By setting adsorption holes and microporous membranes on the inner wall of the mold groove, the adsorption holes and microporous membranes generate negative pressure to adsorb the fan blades during the cooling and forming process of the fan blades, so that the blades are always in contact with the side of the mold cavity closest to the microporous membrane, avoiding warping of the blades during forming and improving the flatness of the fan blades after forming. When the mold is opened, the adsorption holes and microporous membranes maintain a vacuum adsorption state to prevent the fan blades from being pulled when the fixed mold is opened, thus avoiding bending and deformation of the fan blades. When the fan blades are ejected, the adsorption holes and microporous membranes blow air in the opposite direction, which facilitates the separation of the blades from the mold groove.

[0015] 2. In this invention, when ejecting the fan blade, the drive unit first drives the turntable to rotate clockwise. The turntable drives the rotating ring to rotate clockwise through the elastic telescopic rod. When the rotating ring rotates clockwise, it moves backward under the guidance of the guide unit, which can separate the punch from the fan blade and avoid the punch and the fan blade from sticking together, which would cause the fan blade to bend and deform during ejection. Moreover, during the process of punch separation, the adsorption holes and the microporous membrane maintain a vacuum adsorption state, which prevents the fan blade from bending and deforming when the punch moves. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a three-dimensional structural diagram of the support plate and the moving mold template of the present invention when they are in contact.

[0018] Figure 3 This is a three-dimensional structural diagram of the moving mold template of the present invention.

[0019] Figure 4 This is a front sectional view of the moving mold template of the present invention.

[0020] Figure 5 This is the present invention. Figure 4 Enlarged view of point A in the middle.

[0021] Figure 6 This is a three-dimensional structural diagram of the support plate of the present invention.

[0022] Figure 7 This is a half-sectional view of the right side of the support plate of the present invention.

[0023] Figure 8 This is a three-dimensional structural diagram of the driving unit of the present invention.

[0024] Figure 9 This is a three-dimensional structural diagram of the guiding unit of the present invention.

[0025] Figure 10 This is a three-dimensional structural diagram of the fixed mold template of the present invention.

[0026] Figure 11 This is a top sectional view of the punch of the present invention.

[0027] In the diagram: 1. Support plate; 11. Turntable; 111. Ejector rod; 12. Rotary ring; 121. Elastic telescopic rod; 13. Punch; 14. Drive unit; 141. Gear ring; 142. Slide rail; 143. Rack; 144. Sealing ring; 145. Air inlet / outlet; 15. Guide unit; 151. Guide groove; 152. Guide block; 2. Moving mold template; 21. Mold groove; 22. Through hole; 23. Annular groove; 24. Adsorption unit; 241. Adsorption hole; 242. Microporous membrane; 243. Adsorption assembly; 2431. Annular air passage; 2432. Air distribution passage; 2433. Vent valve; 2434. Vacuum valve; 3. Fixed mold template; 31. Injection port one; 32. Injection port two. Detailed Implementation

[0028] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] Please see Figure 1 - Figure 11 A vacuum adsorption type ultra-thin fan blade injection molding fixture includes a support plate 1, a turntable 11 rotatably mounted on the support plate 1, a rotating ring 12 slidably mounted on the outside of the turntable 11, a plurality of circumferentially evenly distributed punches 13 fixedly connected to the front side of the rotating ring 12, and a drive unit 14 for driving the turntable 11 to rotate and a guide unit 15 for driving the rotating ring 12 to move backward when the turntable 11 rotates.

[0030] A moving mold template 2 is installed on the front side of the support plate 1. The moving mold template 2 has mold grooves 21 that are inserted and matched with the punch 13 and are evenly distributed in the circumference. An adsorption unit 24 is installed on the moving mold template 2. The adsorption unit 24 includes a plurality of adsorption holes 241 that are opened inside the moving mold template 2 and communicate with the mold grooves 21. A microporous membrane 242 is fixedly installed on the side wall of the mold grooves 21. An adsorption component 243 for evacuating the adsorption holes 241 is installed inside the moving mold template 2.

[0031] The fixed mold template 3 is installed on the front side of the moving mold template 2 and cooperates with it.

[0032] In practical use, during the cooling and forming process of the fan blade, the adsorption component 243 applies a vacuum to the adsorption hole 241, so that the adsorption hole 241 and the microporous membrane 242 generate negative pressure, keeping the fan blade in contact with the inner wall of the mold groove 21 near the microporous membrane 242 for cooling and forming, thus avoiding the blade from warping due to insufficient support during the forming process.

[0033] By using a microporous membrane 242 to block the adsorption pores 241, the micropores on the microporous membrane 242 are small in diameter and cannot allow molten plastic to pass through, thus preventing molten plastic from entering the adsorption pores 241.

[0034] After the fan blade is formed, the drive unit 14 drives the turntable 11 to rotate clockwise. The turntable 11 drives the rotating ring 12 to rotate clockwise as well. During the clockwise rotation of the turntable 11, the guide unit 15 guides the rotating ring 12 to move backward, so that the rotating ring 12 drives the punch 13 to slide away from the corresponding microporous membrane 242, thereby separating the punch 13 from the fan blade and avoiding adhesion between the punch 13 and the blade. This is beneficial for the subsequent ejection of the fan blade and avoids the thick wire from twisting and deforming during the ejection process.

[0035] Please see Figure 2 , Figure 6 and Figure 7 The turntable 11 has a double-layered frustum structure. The rotating ring 12 is slidably mounted on the step on the front side of the turntable 11. An elastic telescopic rod 121 is installed between the rear side of the rotating ring 12 and the step on the rear side of the turntable 11.

[0036] In practical use, when the turntable 11 rotates, the turntable 11 drives the rotating ring 12 to rotate together through the elastic telescopic rod 121. The elastic telescopic rod 121 can extend and retract to meet the need for the rotating ring 12 to move backward when rotating, so that the punch 13 can move away from the fan blade, avoid the situation where the punch 13 and the fan blade are stuck together, and prevent the fan blade from deforming due to sticking when the fan blade is ejected later.

[0037] Please see Figure 7 and Figure 8 The drive unit 14 includes a gear ring 141 fixedly mounted on the rear step of the turntable 11. The support plate 1 has symmetrically distributed slides 142 on the left and right sides of the turntable 11. A rack 143 is slidably installed inside the slide 142. The rack 143 meshes with the gear ring 141. Both the upper and lower ends of the rack 143 are equipped with sealing rings 144 for sealing the gap between the rack 143 and the slide 142. The top of the support plate 1 is equipped with air inlets and outlets 145 that correspond one-to-one with and communicate with the slides 142. The bottoms of the left and right slides 142 are connected.

[0038] In practical use, the air inlet / outlet 145 is connected to the existing air supply system. When the turntable 11 is to be rotated clockwise, the air supply system supplies air to the air inlet / outlet 145 on the right. At this time, the air pressure at the top of the right slide 142 increases, and the air pushes the rack 143 on the right to move downward. The air at the bottom of the right slide 142 is compressed into the left slide 142, causing the rack 143 on the left to move upward. The air at the top of the left slide 142 is discharged through the air inlet / outlet 145 on the left. The racks 143 on both sides push the gear ring 141 and the turntable 11 to rotate clockwise, causing the punch 13 to separate from the fan blades. Conversely, when the air supply system supplies air to the left slide 142, the rack 143 on the left moves downward and the rack 143 on the right moves upward. The racks 143 drive the turntable 11 to rotate counterclockwise, causing the punch 13 to return to the state of engaging with the mold groove 21.

[0039] The sealing ring 144 on the rack 143 serves to seal, preventing gas leakage during the movement of the rack 143 and ensuring that the rack 143 can move up and down under the push of the gas. The racks 143 on the left and right sides synchronously push the turntable 11 to rotate, which improves the stability of the turntable 11 when it rotates.

[0040] Please see Figure 7 and Figure 9 The guiding unit 15 includes a plurality of guide grooves 151 that are formed on the inner ring wall of the support plate 1 and are evenly distributed in the circumference. The outer ring wall of the rotating ring 12 is fixedly connected with guide blocks 152 that correspond one-to-one with the guide grooves 151. The guide blocks 152 are slidably connected to the corresponding guide grooves 151.

[0041] In practical use, when the turntable 11 drives the rotating ring 12 to rotate clockwise, the guide block 152 on the outer ring wall of the rotating ring 12 will slide along the guide groove 151. The guide groove 151 guides the guide block 152 and the rotating ring 12 to move backward, so that the rotating ring 12 slides backward while rotating, thereby driving the punch 13 to move away from the microporous membrane 242, which is beneficial to the separation of the punch 13 from the fan blade.

[0042] Conversely, when the turntable 11 drives the rotating ring 12 to rotate counterclockwise, the guide groove 151 will guide the guide block 152 and the rotating ring 12 to move forward, so that the punch 13 can be reset to a state that matches the mold groove 21.

[0043] Please see Figure 1 , Figure 6 and Figure 7 Several circumferentially evenly distributed ejector rods 111 are slidably mounted on the turntable 11. The front end of the ejector rod 111 is flush with the front end of the front step of the turntable 11. A cylinder for pushing several turntables 11 to move back and forth is also installed on the rear side of the turntable 11.

[0044] In practical use, the cylinder pushes the ejector rod 111 forward, and the ejector rod 111 pushes the formed fan blade outward, which facilitates the discharge of the fan blade. The evenly distributed ejector rods 111 can push the fan blade out from multiple points, avoiding the fan blade from deflecting during ejection.

[0045] Please see Figure 2 , Figure 5 and Figure 11 The mold groove 21 and the punch 13 are inserted and fitted to form a cavity for injection molding fan blades. The microporous membrane 242 is located on the inner wall of the cavity near the counterclockwise direction. The microporous membrane 242 is a ceramic microporous membrane or a metal microporous membrane. The pore size of the micropores on the microporous membrane 242 is less than 10 μm. The adsorption pressure generated by the microporous membrane 242 is less than 0.8 kPa. The punch 13 is inclined on the side near the clockwise direction and slides with the mold groove 21.

[0046] In practical applications, due to the thin wall thickness of the fan blades, the directly machined cavity width is small, making machining difficult and inconvenient for subsequent ejection of the fan blades. Therefore, a cavity for injection molding fan blades is formed by the cooperation of a punch 13 and a mold groove 21. The punch 13 and the mold groove 21 are wider and easier to machine. Furthermore, when ejecting the fan blades, the punch 13 can separate from the mold groove 21 to a certain extent, increasing the width of the cavity, which is beneficial for the ejection of the fan blades and prevents the fan blades from deforming during ejection.

[0047] Please see Figure 3 - Figure 5 The adsorption component 243 includes an annular air passage 2431 opened inside the moving mold template 2 and surrounding the outside of several mold grooves 21. The inner side of the annular air passage 2431 is connected to several circumferentially evenly distributed branch air passages 2432. The branch air passages 2432 are located between two adjacent mold grooves 21 and are connected to the corresponding adsorption holes 241. The top of the moving mold template 2 is fixedly installed with a vent valve 2433 and a vacuum valve 2434 connected to the annular air passage 2431.

[0048] In practical use, vacuum valve 2434 is connected to existing vacuum equipment, and vent valve 2433 is connected to existing air supply system. During the cooling and forming process of the fan blade, the vacuum equipment is used to perform vacuum treatment on the annular air passage 2431. The air in the adsorption hole 241 is extracted by the annular air passage 2431 and the air distribution passage 2432, so that the adsorption hole 241 and the microporous membrane 242 generate negative pressure, so that the microporous membrane 242 can perform vacuum adsorption on the fan blade, avoiding the warping of the fan blade during the forming process.

[0049] After adsorption is complete, the vent valve 2433 is opened, and air is blown into the annular air passage 2431 through the air supply system, so that air can enter the annular air passage 2431 and blow the fan blades away from the microporous membrane 242, making it easier for the fan blades to be demolded.

[0050] Please see Figure 2 and Figure 3 The moving mold template 2 has a through hole 22 in the middle. The front step of the turntable 11 is slidably inserted into the through hole 22. The front side of the moving mold template 2 has an annular groove 23 for connecting several mold slots 21.

[0051] In practical use, several mold grooves 21 are connected by setting annular grooves 23. During molding, the plastic in the annular grooves 23 can form annular ribs. The annular ribs are used to connect and fix each blade, thereby improving the strength of the blade and further reducing the occurrence of blade warping.

[0052] Please see Figure 1 , Figure 3 and Figure 10 The fixed mold plate 3 has a first injection port 31 in the middle and several second injection ports 32 evenly distributed around the first injection port 31. The rear end of the second injection port 32 is connected to the part of the annular groove 23 located between two adjacent mold grooves 21.

[0053] In practical use, by setting multiple injection ports 32 to inject different blades, several blades can be injected and cooled simultaneously, improving the uniformity of the blades.

[0054] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral connection, or a sliding connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A vacuum adsorption type ultra-thin fan blade injection molding fixture, characterized in that, include: A support plate (1) is provided, on which a turntable (11) is rotatably mounted. A rotating ring (12) is slidably mounted on the outside of the turntable (11). A number of circumferentially evenly distributed punches (13) are fixedly connected to the front side of the rotating ring (12). A drive unit (14) for driving the turntable (11) to rotate and a guide unit (15) for driving the rotating ring (12) to move backward when the turntable (11) rotates are provided on the support plate (1). A moving mold template (2) is installed on the front side of the support plate (1). The moving mold template (2) has a mold groove (21) that is inserted and matched with the punch (13) and is evenly distributed in the circumference. An adsorption unit (24) is installed on the moving mold template (2). The adsorption unit (24) includes a plurality of adsorption holes (241) opened inside the moving mold template (2) and communicating with the mold groove (21). A microporous membrane (242) is fixedly installed on the side wall of the mold groove (21). An adsorption component (243) for evacuating the adsorption holes (241) is installed inside the moving mold template (2). A fixed mold template (3) is installed on the front side of the moving mold template (2) and cooperates with it.

2. The vacuum adsorption type ultra-thin fan blade injection molding fixture according to claim 1, characterized in that: The turntable (11) is a double-layered frustum structure. The rotating ring (12) is slidably mounted on the step in front of the turntable (11). An elastic telescopic rod (121) is installed between the rear side of the rotating ring (12) and the step in front of the turntable (11).

3. The vacuum adsorption type ultra-thin fan blade injection molding fixture according to claim 2, characterized in that: The drive unit (14) includes a gear ring (141) fixedly mounted on the rear step of the turntable (11). The support plate (1) has symmetrically distributed slides (142) on the left and right sides of the turntable (11). A rack (143) is slidably installed inside the slide (142). The rack (143) meshes with the gear ring (141). Both the upper and lower ends of the rack (143) are equipped with sealing rings (144) for sealing the gap between the rack (143) and the slide (142). The top of the support plate (1) is equipped with air inlets and outlets (145) that correspond one-to-one with and communicate with the slides (142).

4. The vacuum adsorption type ultra-thin fan blade injection molding fixture according to claim 2, characterized in that: The guiding unit (15) includes a plurality of guide grooves (151) that are opened on the inner ring wall of the support plate (1) and are evenly distributed in the circumference. The outer ring wall of the rotating ring (12) is fixedly connected with guide blocks (152) that correspond one-to-one with the guide grooves (151). The guide blocks (152) are slidably connected to the corresponding guide grooves (151).

5. The vacuum adsorption type ultra-thin fan blade injection molding fixture according to claim 1, characterized in that: The mold groove (21) and the punch (13) are inserted and fitted together to form a cavity for injection molding fan blades. The microporous membrane (242) is located on the inner wall of the cavity near the counterclockwise direction. The punch (13) is inclined on the side near the clockwise direction and slides in fit with the mold groove (21).

6. The vacuum adsorption type ultra-thin fan blade injection molding fixture according to claim 1, characterized in that: The adsorption assembly (243) includes an annular air passage (2431) opened inside the moving mold template (2) and surrounding the outside of several mold slots (21). The inner side of the annular air passage (2431) is connected to several circumferentially evenly distributed branch air passages (2432). The branch air passages (2432) are located between two adjacent mold slots (21) and are connected to the corresponding adsorption holes (241). The top of the moving mold template (2) is fixedly installed with a vent valve (2433) and a vacuum valve (2434) connected to the annular air passage (2431).

7. The vacuum adsorption type ultra-thin fan blade injection molding fixture according to claim 1, characterized in that: The moving mold template (2) has a through hole (22) in the middle. The front step of the turntable (11) is slidably inserted into the through hole (22). The front side of the moving mold template (2) has an annular groove (23) for connecting several mold slots (21).

8. The vacuum adsorption type ultra-thin fan blade injection molding fixture according to claim 7, characterized in that: The fixed mold template (3) has a first injection port (31) in the middle. The fixed mold template (3) has several second injection ports (32) evenly distributed around the first injection port (31). The rear end of the second injection port (32) is connected to the part of the annular groove (23) located between two adjacent mold grooves (21).

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