Injection molding apparatus and method for a drone monolithic fuel tank

Abstract

The application discloses a kind of injection molding device and method for unmanned aerial vehicle integrated tank, it is related to injection molding device technical field, including equipment rack, injection plasticizing unit, hopper and mold clamping mechanism, the hopper with the injection plasticizing unit communication, the mold clamping mechanism is set on the equipment rack, injection mold is equipped on the mold clamping mechanism, the injection mold includes upper fixed plate, lower fixed plate, upper template, lower template and intermediate die body, the intermediate die body is set between the upper template and the lower template, and the intermediate die body is equipped with mold core forming cavity;By being respectively set right core-pulling assembly and left core-pulling assembly in the two sides of intermediate die body, right core-pulling block and left core-pulling block can be respectively from the opposite sides of mold core forming cavity participate in tank side structure forming, after forming, by right core-pulling rod and left core-pulling rod respectively drive corresponding core-pulling block exit, it is favorable to reduce tank side structure in demolding process and deformation.

Description

Technical Field

[0001] This invention relates to the field of injection molding equipment technology, specifically to an injection molding device and method for an integral fuel tank for unmanned aerial vehicles (UAVs). Background Technology

[0002] The integrated fuel tank of drones is mostly a thin-walled irregular plastic part. The fuel tank is usually equipped with a filling port, an oil outlet and a side connection structure. When it is molded by injection molding, the holes, bosses or grooves on the side of the fuel tank need to be formed by a side core pulling structure. Since the fuel tank wall is thin, if the side core pulling is not guided stably, it is easy to damage the side wall during core pulling or cause deviation in the size of the side holes.

[0003] Existing injection molds typically use single-sided sliders or ordinary core-pulling rods to complete side molding. However, for oil tanks with molding structures on both sides, the left and right core-pulling components need to be positioned, pulled, and reset separately within a small space. If the fit between the core-pulling block and the mold core cavity is unstable, problems such as incomplete core pulling, burrs on the molding edge, and high local demolding resistance may occur.

[0004] In addition, the mold core of the integral oil tank is relatively deep. After the product cools down, it is easy to stick to the inner wall of the mold core. When it is ejected by the ejector pin alone, the product is subjected to concentrated force and is prone to ejection deformation. If gas is introduced into the mold core before demolding, so that the product and the cavity wall form an auxiliary separation effect, the ejection resistance can be reduced. However, the air passage arrangement and the core pulling and ejection structure in the existing mold lack coordination, and the demolding stability is still insufficient.

[0005] To address this issue, we propose an injection molding device and method for integral fuel tanks of unmanned aerial vehicles (UAVs), thus resolving the aforementioned problems. Summary of the Invention

[0006] In view of this, and to address the shortcomings of the prior art, the present invention provides an injection molding device and method for an integral fuel tank for unmanned aerial vehicles (UAVs) to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an injection molding device for an integrated fuel tank of an unmanned aerial vehicle (UAV), comprising an equipment frame, an injection plasticizing unit, a hopper, and a mold closing mechanism. The hopper is connected to the injection plasticizing unit. The mold closing mechanism is mounted on the equipment frame and has an injection mold. The injection mold includes an upper fixed plate, a lower fixed plate, an upper template, a lower template, and an intermediate mold body. The intermediate mold body is located between the upper template and the lower template and has a core forming cavity. The upper fixed plate has a positioning ring and a sprue sleeve, and the sprue sleeve is connected to the core forming cavity.

[0008] The middle mold body is provided with a right core-pulling assembly and a left core-pulling assembly on both sides. The right core-pulling assembly includes a right slider seat, a right core-pulling block and a right core-pulling rod. The left core-pulling assembly includes a left slider seat, a left core-pulling block and a left core-pulling rod.

[0009] The injection mold is provided with an ejection assembly, which includes an ejector plate, an ejector rod, and a reset rod. The ejector rod is correspondingly arranged with the mold core forming cavity.

[0010] The intermediate mold body is provided with a cooling connector and an air passage connector. The cooling connector is connected to the cooling channel inside the intermediate mold body, and the air passage connector is connected to the mold core forming cavity.

[0011] Preferably, a guide post and a guide sleeve are provided between the upper fixing plate and the lower fixing plate, and the guide post passes through the guide sleeve to limit the mold closing guide direction of the upper template, the intermediate mold body and the lower template.

[0012] Preferably, the positioning ring is disposed on the feeding side of the upper fixed plate, the sprue sleeve is disposed inside the positioning ring, and the discharge end of the injection plasticizing unit is aligned with the sprue sleeve via the positioning ring.

[0013] Preferably, the right core-pulling assembly further includes a lateral pressure block and a guide connecting seat, the right core-pulling rod is connected to the right core-pulling block, the right core-pulling block is slidably disposed on the right slider seat, the lateral pressure block is pressed against the outside of the right slider seat, and the guide connecting seat is connected to the right slider seat.

[0014] Preferably, the left core-pulling assembly further includes a guide connecting rod and a left positioning inclined block. The left core-pulling rod is connected to the left core-pulling block, the left core-pulling block is slidably disposed on the left slider seat, the left positioning inclined block abuts against one side of the left slider seat, and the guide connecting rod is inserted obliquely from top to bottom into the interior of the left core-pulling block, the left positioning inclined block and the intermediate mold body. The bottom end of the guide connecting rod is inserted into the lower template so that the left core-pulling block moves relative to the mold core forming cavity along the inclined direction of the guide connecting rod.

[0015] Preferably, the right core-pulling block and the left core-pulling block extend into the core forming cavity from opposite sides of the intermediate mold body, and together with the core forming cavity, define the side forming area of ​​the integrated fuel tank of the UAV.

[0016] Preferably, the ejection assembly further includes a guide post, a compression spring, and a limiting block. The guide post is disposed between the ejection plate and the intermediate mold body. The compression spring is sleeved on the outside of the guide post and located between the ejection plate and the intermediate mold body. The limiting block is disposed on the movement path of the ejection plate.

[0017] Preferably, the cooling connector includes an inlet connector and an outlet connector disposed on the side wall of the intermediate mold body, and the inlet connector and the outlet connector are respectively connected to both ends of the cooling channel in the intermediate mold body.

[0018] Preferably, the air connector is disposed on the side wall of the intermediate mold body, and the air connector is connected to the mold core forming cavity through the air channel, and supplies demolding gas to the mold core forming cavity during demolding.

[0019] A preferred injection molding method for an integral fuel tank for a drone includes the following steps:

[0020] Step 1: Align the discharge end of the injection plasticizing unit with the sprue bushing using the positioning ring, and drive the upper mold plate, middle mold body and lower mold plate to close the mold through the mold closing mechanism, so that the mold core forming cavity, right core pulling block and left core pulling block together form the forming space of the drone's integrated fuel tank.

[0021] Step 2: The material is fed to the injection molding unit through the hopper, and the injection molding unit injects the molten plastic into the mold core cavity through the sprue sleeve;

[0022] Step 3: Cooling medium is introduced into the intermediate mold through the cooling joint to cool the periphery of the mold core forming cavity, so that the integrated fuel tank of the UAV is cooled and shaped in the forming space.

[0023] Step 4: After mold opening, drive the right core-pulling rod and the left core-pulling rod respectively to make the right core-pulling block and the left core-pulling block retract from the side molding area of ​​the drone's integral fuel tank.

[0024] Step 5: Introduce demolding gas into the mold core forming cavity through the air connector, and drive the ejector plate to push the drone's integrated fuel tank with the ejector rod, so that the drone's integrated fuel tank is separated from the mold core forming cavity. Then, reset the ejector assembly through the reset rod.

[0025] Compared with the prior art, the present invention provides an injection molding device and method for an integral fuel tank for unmanned aerial vehicles, which has the following beneficial effects:

[0026] By setting a right core-pulling assembly and a left core-pulling assembly on both sides of the middle mold body, the right core-pulling block and the left core-pulling block can participate in the forming of the side structure of the oil tank from the opposite sides of the mold core forming cavity. After forming, the right core-pulling rod and the left core-pulling rod drive the corresponding core-pulling block to exit, which helps to reduce the tearing and deformation of the side structure of the oil tank during the demolding process.

[0027] In the left core-pulling assembly, a guide connecting rod is inserted diagonally from top to bottom into the interior of the left core-pulling block, the left positioning inclined block, and the middle mold body, with its bottom end inserted into the lower mold plate. This allows the left core-pulling block to move along the inclined direction of the guide connecting rod. This structure provides a guiding foundation for the diagonal core-pulling of the left core-pulling block and improves the stability of the left core-pulling action.

[0028] By setting a cooling joint on the intermediate mold body and connecting the cooling joint to the cooling channel inside the intermediate mold body, the periphery of the mold core forming cavity can be cooled, so that the integrated fuel tank of the UAV can be cooled and shaped in the forming space, which is beneficial to improving the cooling stability during the forming cycle.

[0029] By setting an air passage connector on the intermediate mold body, the air passage connector is connected to the mold core forming cavity through the air passage channel. During demolding, demolding gas can be introduced into the mold core forming cavity through the air passage connector, so that the product and the mold core forming cavity form an auxiliary separation effect, thereby reducing the demolding resistance when the ejector pin is ejected alone.

[0030] By setting up an ejector plate, ejector rod, and reset rod, and further cooperating with guide pillars, compression springs, and limit blocks, the compression spring is sleeved on the outside of the guide pillar and located between the ejector plate and the intermediate mold body, so that the ejector assembly can cooperate with the reset rod to achieve reset after ejection, which helps to ensure the stability of subsequent mold closing and the next molding process. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of the injection molding device of the present invention;

[0032] Figure 2 This is a schematic diagram of the injection mold in the closed state of the present invention;

[0033] Figure 3 This is an exploded structural diagram of the injection mold of the present invention;

[0034] Figure 4 This is a partial structural diagram of the injection mold of the present invention in the mold-open state;

[0035] Figure 5 This is a front view structural diagram of the injection mold of the present invention;

[0036] Figure 6 This is a schematic diagram of the ejection assembly, right core-pulling assembly, and cooling joint in the injection mold of the present invention;

[0037] Figure 7 This is a front view schematic diagram of the right core-pulling assembly and the ejection assembly in the injection mold of the present invention;

[0038] Figure 8 This is a schematic diagram of the right core-pulling assembly, guide connecting seat, and side pressure block in the injection mold of the present invention;

[0039] Figure 9 This is a front view schematic diagram of the left core-pulling assembly and air passage connector in the injection mold of the present invention;

[0040] Figure 10This is a cross-sectional schematic diagram of the left core-pulling assembly and guide connecting rod in the injection mold of the present invention.

[0041] In the diagram: 11. Equipment frame; 12. Injection molding unit; 13. Hopper; 14. Mold closing mechanism; 21. Upper fixed plate; 22. Lower fixed plate; 23. Upper mold plate; 24. Lower mold plate; 25. Intermediate mold body; 26. Mold core forming cavity; 27. Positioning ring; 28. Sprue sleeve; 31. Guide pillar; 32. Guide sleeve; 33. Mounting seat; 41. Ejector plate; 42. Ejector rod; 43. Reset rod; 44. Guide pillar; 45. Compression spring; 46. Limiting block; 51. Right slider seat; 52. Right core-pulling block; 53. Right core-pulling rod; 54. Side pressure block; 55. Guide connecting seat; 61. Left slider seat; 62. Left core-pulling block; 63. Left core-pulling rod; 64. Guide connecting rod; 65. Left positioning inclined block; 71. Cooling joint; 72. Air passage joint. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Example 1

[0044] like Figure 1 As shown, this embodiment provides an injection molding device for an integrated fuel tank for unmanned aerial vehicles (UAVs), including a frame 11, an injection plasticizing unit 12, a hopper 13, and a mold closing mechanism 14. The frame 11 serves as the supporting foundation for the entire device. The injection plasticizing unit 12 and the mold closing mechanism 14 are both mounted on the frame 11. The hopper 13 is connected to the injection plasticizing unit 12. Plastic particles enter the injection plasticizing unit 12 through the hopper 13 and are plasticized and injected within the injection plasticizing unit 12. The mold closing mechanism 14 is used to install and drive the injection mold, enabling the injection mold to remain in a closed state before injection and to open after the product cools and solidifies. Thus, the frame 11, the injection plasticizing unit 12, the hopper 13, and the mold closing mechanism 14 form a complete injection molding supply and mold closing support foundation, allowing molten plastic to stably enter the injection mold.

[0045] like Figures 2 to 5As shown, the mold clamping mechanism 14 is equipped with an injection mold, which includes an upper fixed plate 21, a lower fixed plate 22, an upper template 23, a lower template 24, and an intermediate mold body 25. The upper fixed plate 21 and the lower fixed plate 22 are located at the upper and lower ends of the injection mold, respectively, to form the installation support base of the mold. The upper template 23 is located below the upper fixed plate 21, and the lower template 24 is located above the lower fixed plate 22. The intermediate mold body 25 is located between the upper template 23 and the lower template 24. The intermediate mold body 25 is provided with a core forming cavity 26, which is used to form part of the forming space of the integrated fuel tank of the UAV. Through the upper and lower cooperation of the upper template 23, the lower template 24, and the intermediate mold body 25, the core forming cavity 26 can maintain a stable forming boundary in the mold-closed state, which is beneficial to improving the forming stability of the main body of the fuel tank.

[0046] It should be noted that when the device is in use, the upper fixing plate 21 and the lower fixing plate 22 are installed horizontally inside the mold closing mechanism 14, and the positioning ring 27 on the upper fixing plate 21 is connected to the sprue sleeve 28 and the material output end in the injection plasticizing unit 12.

[0047] In the mold-closed state, the upper mold plate 23, the middle mold body 25, the lower mold plate 24, the right core-pulling block 52, and the left core-pulling block 62 together define the molding space of the UAV integral fuel tank. Thus, the mold core molding cavity 26 is used to form the main body of the fuel tank, and the right core-pulling block 52 and the left core-pulling block 62 are used to form the side molding areas of the fuel tank, respectively. Through the cooperation of the mold core molding cavity 26 and the left and right core-pulling blocks, the molding of the main body of the fuel tank and the side molding areas can be completed in the same injection molding process, reducing the dimensional deviation caused by the separate post-processing of the side structure.

[0048] The upper fixed plate 21 is provided with a positioning ring 27 and a sprue sleeve 28. The positioning ring 27 is located on the feeding side of the upper fixed plate 21 to keep the discharge end of the injection plasticizing unit 12 aligned with the sprue sleeve 28. The sprue sleeve 28 is located inside the positioning ring 27 and communicates with the mold core forming cavity 26. During injection, the molten plastic is output from the injection plasticizing unit 12, aligned by the positioning ring 27, and enters the sprue sleeve 28. Then, it enters the mold core forming cavity 26 through the sprue sleeve 28. This structure can reduce the feeding instability caused by the eccentricity between the injection end and the mold feeding end, and make the molten plastic enter the mold core forming cavity 26 more stably, thereby reducing the impact of feeding deviation on the molding quality of the oil tank.

[0049] A guide post 31 and a guide sleeve 32 are provided between the upper fixed plate 21 and the lower fixed plate 22. The guide post 31 passes through the guide sleeve 32. When the mold closing mechanism 14 drives the injection mold to open and close, the guide post 31 and the guide sleeve 32 cooperate to guide the upper mold plate 23, the intermediate mold body 25 and the lower mold plate 24 to move in a predetermined direction, thereby ensuring the alignment stability during the mold opening and closing process. The mounting seat 33 is set on the injection mold and is used to provide a mounting or support base for local parts of the mold. Through the cooperation of the guide post 31 and the guide sleeve 32, the relative offset between the upper mold plate 23, the intermediate mold body 25 and the lower mold plate 24 can be reduced, so that the mold core forming cavity 26 maintains good repeatability positioning accuracy during multiple mold opening and closing processes.

[0050] like Figures 6 to 8 As shown, a right core-pulling assembly is provided on one side of the intermediate mold body 25. The right core-pulling assembly includes a right slider seat 51, a right core-pulling block 52, and a right core-pulling rod 53. The right slider seat 51 is located on one side of the intermediate mold body 25 and is used to support the right core-pulling block 52. The right core-pulling block 52 is slidably mounted on the right slider seat 51. The right core-pulling rod 53 is connected to the right core-pulling block 52. The right core-pulling rod 53 can drive the right core-pulling block 52 to extend into or retract from the mold core forming cavity 26. Through the support and guidance of the right slider seat 51 on the right core-pulling block 52, the right core-pulling block 52 maintains a stable movement position when participating in molding and retracting, which helps to reduce the dimensional deviation of the right side forming area.

[0051] The right core-pulling assembly also includes a lateral pressure block 54 and a guide connecting seat 55. The lateral pressure block 54 presses against the outside of the right slider seat 51 to limit the lateral displacement of the right slider seat 51 or the right core-pulling block 52 during the core-pulling process. The guide connecting seat 55 is connected to the right slider seat 51 to provide a connection and guiding base for the right core-pulling assembly. During mold closing and injection molding, the right core-pulling block 52 extends into one side of the mold core forming cavity 26 and participates in forming one side forming area of ​​the UAV integral fuel tank. After cooling and solidification, the right core-pulling rod 53 drives the right core-pulling block 52 to exit from the side forming area relative to the right slider seat 51, so that the side structure of the fuel tank is separated from the right core-pulling block 52. The lateral pressure block 54 cooperates with the right slider seat 51 to improve the position holding ability of the right core-pulling block 52 under molding pressure. The guide connecting seat 55 cooperates with the right slider seat 51 to improve the stability of the right core-pulling assembly during assembly and movement.

[0052] like Figure 9 and Figure 10As shown, a left core-pulling assembly is provided on the other side of the intermediate mold body 25. The left core-pulling assembly includes a left slider seat 61, a left core-pulling block 62, and a left core-pulling rod 63. The left slider seat 61 is located on the other side of the intermediate mold body 25 and is used to support the left core-pulling block 62. The left core-pulling block 62 is slidably mounted on the left slider seat 61. The left core-pulling rod 63 is connected to the left core-pulling block 62 and is used to drive the left core-pulling block 62 to move relative to the core forming cavity 26. Through the sliding support of the left slider seat 61 on the left core-pulling block 62, the left core-pulling block 62 can maintain a stable relative position with the core forming cavity 26 during the core-pulling process.

[0053] The left core-pulling assembly also includes a guide connecting rod 64 and a left positioning wedge 65. The left positioning wedge 65 abuts against one side of the left slider seat 61 to form an oblique positioning fit between the left slider seat 61 or the left core-pulling block 62. The guide connecting rod 64 is inserted obliquely from top to bottom into the interior of the left core-pulling block 62, the left positioning wedge 65, and the intermediate mold body 25. The bottom end of the guide connecting rod 64 is inserted into the lower mold plate 24. Because the guide connecting rod 64 is arranged obliquely from top to bottom, the left core-pulling block 62 is positioned on the left... Driven by the core-pulling rod 63, it can move relative to the core forming cavity 26 along the inclined direction of the guide connecting rod 64. This structure can provide guidance for the oblique movement of the left core-pulling block 62, so that the left core-pulling block 62 can complete the oblique core-pulling relative to the core forming cavity 26. Through the insertion and cooperation of the guide connecting rod 64, the left positioning inclined block 65 and the lower template 24, the oblique movement path of the left core-pulling block 62 can be made clearer, reducing the possibility of the left core-pulling block 62 swaying when exiting the side forming area of ​​the oil tank.

[0054] The right core-pulling block 52 and the left core-pulling block 62 extend into the core forming cavity 26 from opposite sides of the middle mold body 25, and together with the core forming cavity 26, define the side forming area of ​​the integrated fuel tank of the UAV. During mold closing and injection molding, the right core-pulling block 52 and the left core-pulling block 62 are in the extended state to participate in forming the side structure of the fuel tank. After the mold opens, the right core-pulling block 52 and the left core-pulling block 62 exit the corresponding side forming area, so that the formed fuel tank can be ejected smoothly. Through the cooperation of the core-pulling blocks on opposite sides and the core forming cavity 26, the side structure can be formed while ensuring the main body of the fuel tank is formed, and the interference between the side structure and the core-pulling block is eliminated before ejection.

[0055] like Figure 6 and Figure 7As shown, the injection mold is equipped with an ejection assembly, which includes an ejector plate 41, an ejector rod 42, and a reset rod 43. The ejector rod 42 is correspondingly arranged with the core forming cavity 26. The ejector plate 41 is used to drive the ejector rod 42 to move. After the core pulling is completed, the ejector plate 41 pushes the ejector rod 42 to move towards the core forming cavity 26. The ejector rod 42 pushes the molded UAV integral oil tank, causing the oil tank to be dislodged from the core forming cavity 26. The reset rod 43 is used to return the ejection assembly to its initial position after the ejection action is completed. Through the cooperation of the ejector plate 41 and the ejector rod 42, the ejection force can be transmitted to the molded oil tank, so that the oil tank is dislodged from the core forming cavity 26 after the left and right core pulling blocks are removed. The reset rod 43 can ensure that the ejection assembly returns to its initial position after ejection, which is convenient for the next molding.

[0056] The ejection assembly also includes a guide post 44, a compression spring 45, and a limiting block 46. The guide post 44 is disposed between the ejection plate 41 and the intermediate mold body 25. The compression spring 45 is sleeved on the outside of the guide post 44 and located between the ejection plate 41 and the intermediate mold body 25. When the ejection plate 41 moves, it moves along the guide post 44. The compression spring 45 is compressed during the movement of the ejection plate 41 and provides a reset force after ejection. The limiting block 46 is disposed on the movement path of the ejection plate 41 to limit the maximum movement stroke of the ejection plate 41 and prevent the ejector rod 42 from being excessively ejected. The guide post 44 guides the ejection plate 41, which can reduce the skewness of the ejection plate 41 during movement. The compression spring 45 provides a reset force, which can improve the reliability of the ejection assembly reset. The limiting block 46 limits the stroke of the ejection plate 41, which can reduce the possibility of excessive ejection affecting the oil tank or mold.

[0057] The intermediate mold 25 is provided with a cooling connector 71, which is connected to the cooling channel inside the intermediate mold 25. The cooling connector 71 includes a liquid inlet connector and a liquid outlet connector provided on the side wall of the intermediate mold 25. The liquid inlet connector and the liquid outlet connector are respectively connected to the two ends of the cooling channel inside the intermediate mold 25. After injection molding, the cooling medium enters the cooling channel through the liquid inlet connector, flows along the periphery of the mold core forming cavity 26, and is discharged from the liquid outlet connector. Through this cooling path, the periphery of the mold core forming cavity 26 can be cooled, so that the UAV integral fuel tank can be cooled and shaped in the molding space. Through the cooperation of the cooling connector 71 and the cooling channel inside the intermediate mold 25, the cooling medium can flow around the periphery of the mold core forming cavity 26, which helps to reduce the possibility of deformation of the fuel tank due to local temperature difference during the cooling stage after molding.

[0058] An air connector 72 is also provided on the intermediate mold body 25. The air connector 72 is located on the side wall of the intermediate mold body 25 and is connected to the core forming cavity 26 through the air passage. After the integrated fuel tank of the UAV is cooled, the outer wall of the product can easily fit with the cavity wall of the core forming cavity 26. During demolding, demolding gas is supplied to the core forming cavity 26 through the air connector 72, so that the demolding gas enters the core forming cavity 26 to help the integrated fuel tank of the UAV after molding to separate from the core forming cavity 26. Then, the product is pushed by the ejector rod 42, which can reduce the local force when simply ejecting mechanically. Through the connection and cooperation between the air connector 72 and the core forming cavity 26, a gas-assisted separation effect can be formed before ejection, so that the adhesion resistance that the ejector rod 42 needs to overcome when ejecting is reduced, thereby reducing the possibility of local deformation of the thin-walled fuel tank during ejection.

[0059] Example 2

[0060] An injection molding method for integral fuel tanks for drones includes the following steps:

[0061] Step 1: Align the discharge end of the injection plasticizing unit 12 with the sprue sleeve 28 using the positioning ring 27, and drive the upper mold plate 23, the middle mold body 25 and the lower mold plate 24 to close the mold through the mold closing mechanism 14, so that the mold core forming cavity 26, the right core pulling block 52 and the left core pulling block 62 together form the forming space of the UAV integrated fuel tank.

[0062] Step 2: Material is supplied to the injection plasticizing unit 12 through the hopper 13, and the injection plasticizing unit 12 injects the molten plastic into the mold core forming cavity 26 through the sprue sleeve 28;

[0063] Step 3: Cooling medium is introduced into the intermediate mold body 25 through cooling joint 71 to cool the periphery of the mold core forming cavity 26, so that the UAV integral fuel tank is cooled and shaped in the forming space.

[0064] Step 4: After mold opening, drive the right core-pulling rod 53 and the left core-pulling rod 63 respectively, so that the right core-pulling block 52 and the left core-pulling block 62 exit from the side forming area of ​​the UAV integral fuel tank.

[0065] Step 5: Introduce demolding gas into the mold core forming cavity 26 through the air connector 72, and drive the ejector plate 41 to push the drone's integrated fuel tank with the ejector rod 42, so that the drone's integrated fuel tank is separated from the mold core forming cavity 26. Then, reset the ejector assembly through the reset rod 43.

[0066] The overall working process and principle of the above embodiments are as follows:

[0067] The positioning ring 27 aligns the discharge end of the injection plasticizing unit 12 with the sprue sleeve 28. The mold closing mechanism 14 drives the upper mold plate 23, the middle mold body 25 and the lower mold plate 24 to close the mold, so that the mold core forming cavity 26, the right core pulling block 52 and the left core pulling block 62 together form the forming space of the UAV integrated fuel tank. During this process, the guide pillar 31 and the guide sleeve 32 cooperate to keep the mold opening and closing direction stable, and the right core pulling block 52 and the left core pulling block 62 are respectively held in the forming position.

[0068] Subsequently, the material is supplied to the injection plasticizing unit 12 through the hopper 13. The injection plasticizing unit 12 plasticizes the plastic raw material into molten plastic and injects the molten plastic into the mold core forming cavity 26 through the sprue sleeve 28. After the molten plastic enters the forming space, it fills the mold core forming cavity 26 and the side forming area defined by the right core pulling block 52 and the left core pulling block 62, thereby forming the main body and side structure of the UAV integrated fuel tank.

[0069] After injection molding is completed, cooling medium is introduced into the intermediate mold body 25 through cooling joint 71. The cooling medium flows along the cooling channel to cool the periphery of the mold core forming cavity 26, so that the UAV integral fuel tank in the molding space is gradually cooled and shaped. Through the cooperation of the cooling channel and the intermediate mold body 25, the cooling effect can be concentrated on the periphery of the mold core forming cavity 26.

[0070] After cooling and solidification, the mold closing mechanism 14 drives the injection mold to open. After opening, the right core-pulling rod 53 and the left core-pulling rod 63 are driven respectively. The right core-pulling rod 53 drives the right core-pulling block 52 to exit the right side molding area of ​​the oil tank relative to the right slider seat 51. The left core-pulling rod 63 drives the left core-pulling block 62 to exit the left side molding area of ​​the oil tank along the inclined direction of the guide connecting rod 64. By having the left and right core-pulling blocks exit the side molding area first, the cooperation relationship between the side molding structure and the core-pulling block can be released, providing conditions for subsequent ejection.

[0071] After the left and right core-pulling blocks retract, demolding gas is introduced into the core forming cavity 26 through the air connector 72. The demolding gas enters the core forming cavity 26 to assist the oil tank in separating from the core forming cavity 26. Then, the ejector plate 41 is driven, and the ejector plate 41 drives the ejector rod 42 to push the drone's integrated oil tank, causing the drone's integrated oil tank to detach from the core forming cavity 26. After the product is removed, the ejector assembly is reset under the action of the reset rod 43 and the compression spring 45, waiting for the next injection molding. Through the cooperation of gas-assisted demolding and the ejector assembly, the adhesion resistance between the oil tank and the core forming cavity 26 can be reduced first, and then the ejector rod 42 completes the ejection, thereby improving the stability of the demolding process.

[0072] In the above embodiments, the equipment frame 11, injection plasticizing unit 12, hopper 13, mold closing mechanism 14, upper fixing plate 21, lower fixing plate 22, upper template 23, lower template 24, intermediate mold body 25, mold core forming cavity 26, positioning ring 27, sprue sleeve 28, guide pillar 31, guide sleeve 32, ejection assembly, right core pulling assembly, left core pulling assembly, cooling joint 71, and air passage joint 72 all correspond to the corresponding structures in the claims. The driving methods of injection plasticizing drive, mold closing drive, right core pulling rod 53 and left core pulling rod 63, the cooling medium supply method, and the demolding gas supply method, which are not described in detail, can all be implemented using conventional methods in the art.

[0073] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0074] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An injection molding device for an integrated fuel tank for a drone, comprising a machine frame (11), an injection molding unit (12), a hopper (13), and a mold closing mechanism (14), wherein the hopper (13) is connected to the injection molding unit (12), and the mold closing mechanism (14) is disposed on the machine frame (11), characterized in that, The mold closing mechanism (14) is provided with an injection mold, which includes an upper fixed plate (21), a lower fixed plate (22), an upper template (23), a lower template (24) and an intermediate mold body (25). The intermediate mold body (25) is located between the upper template (23) and the lower template (24). The intermediate mold body (25) is provided with a core forming cavity (26). The upper fixed plate (21) is provided with a positioning ring (27) and a sprue sleeve (28). The sprue sleeve (28) is connected to the core forming cavity (26). The middle mold (25) is provided with a right core-pulling assembly and a left core-pulling assembly on both sides. The right core-pulling assembly includes a right slider seat (51), a right core-pulling block (52) and a right core-pulling rod (53). The left core-pulling assembly includes a left slider seat (61), a left core-pulling block (62) and a left core-pulling rod (63). The injection mold is provided with an ejection assembly, which includes an ejection plate (41), an ejector rod (42) and a reset rod (43). The ejector rod (42) is correspondingly arranged with the mold core forming cavity (26). The intermediate mold (25) is provided with a cooling connector (71) and an air passage connector (72). The cooling connector (71) is connected to the cooling channel inside the intermediate mold (25), and the air passage connector (72) is connected to the mold core forming cavity (26).

2. The injection molding device for an integral fuel tank of an unmanned aerial vehicle according to claim 1, characterized in that: A guide post (31) and a guide sleeve (32) are provided between the upper fixed plate (21) and the lower fixed plate (22). The guide post (31) passes through the guide sleeve (32) to limit the mold closing guide direction of the upper template (23), the intermediate mold body (25) and the lower template (24).

3. The injection molding device for an integral fuel tank of an unmanned aerial vehicle according to claim 1, characterized in that: The positioning ring (27) is located on the feeding side of the upper fixed plate (21), and the sprue sleeve (28) is located inside the positioning ring (27). The discharge end of the injection plasticizing unit (12) is aligned with the sprue sleeve (28) via the positioning ring (27).

4. The injection molding device for an integral fuel tank for a drone according to claim 1, characterized in that: The right core-pulling assembly further includes a lateral pressure block (54) and a guide connecting seat (55). The right core-pulling rod (53) is connected to the right core-pulling block (52). The right core-pulling block (52) is slidably disposed on the right slider seat (51). The lateral pressure block (54) presses against the outside of the right slider seat (51). The guide connecting seat (55) is connected to the right slider seat (51).

5. The injection molding device for an integral fuel tank for a drone according to claim 1, characterized in that: The left core-pulling assembly also includes a guide connecting rod (64) and a left positioning inclined block (65). The left core-pulling rod (63) is connected to the left core-pulling block (62). The left core-pulling block (62) is slidably disposed on the left slider seat (61). The left positioning inclined block (65) abuts against one side of the left slider seat (61). The guide connecting rod (64) is inserted obliquely from top to bottom into the interior of the left core-pulling block (62), the left positioning inclined block (65), and the intermediate mold body (25). The bottom end of the guide connecting rod (64) is inserted into the lower template (24) so ​​that the left core-pulling block (62) moves relative to the core forming cavity (26) along the inclined direction of the guide connecting rod (64).

6. The injection molding device for an integral fuel tank for a drone according to claim 1, characterized in that: The right core-pulling block (52) and the left core-pulling block (62) extend into the core forming cavity (26) from opposite sides of the intermediate mold (25), and together with the core forming cavity (26), define the side forming area of ​​the UAV integral fuel tank.

7. The injection molding device for an integral fuel tank for a drone according to claim 1, characterized in that: The ejection assembly also includes a guide post (44), a compression spring (45), and a limiting block (46). The guide post (44) is disposed between the ejection plate (41) and the intermediate mold body (25). The compression spring (45) is sleeved on the outside of the guide post (44) and located between the ejection plate (41) and the intermediate mold body (25). The limiting block (46) is disposed on the movement path of the ejection plate (41).

8. The injection molding device for an integral fuel tank for a drone according to claim 1, characterized in that: The cooling connector (71) includes an inlet connector and an outlet connector disposed on the side wall of the intermediate mold (25), and the inlet connector and the outlet connector are respectively connected to both ends of the cooling channel in the intermediate mold (25).

9. The injection molding device for an integral fuel tank of an unmanned aerial vehicle according to claim 1, characterized in that: The gas connector (72) is located on the side wall of the intermediate mold body (25). The gas connector (72) is connected to the mold core forming cavity (26) through the gas channel and supplies demolding gas to the mold core forming cavity (26) during demolding.

10. An injection molding method for an integral fuel tank for a drone, applicable to the injection molding apparatus for an integral fuel tank for a drone as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Align the discharge end of the injection plasticizing unit (12) with the sprue bushing (28) using the positioning ring (27), and drive the upper mold plate (23), the middle mold body (25) and the lower mold plate (24) to close the mold through the mold closing mechanism (14), so that the mold core forming cavity (26), the right core pulling block (52) and the left core pulling block (62) together form the forming space of the UAV integrated fuel tank; Step 2: The material is supplied to the injection plasticizing unit (12) through the hopper (13), and the injection plasticizing unit (12) injects the molten plastic into the mold core forming cavity (26) through the sprue sleeve (28). Step 3: Cooling medium is introduced into the intermediate mold (25) through the cooling joint (71) to cool the periphery of the mold core forming cavity (26), so that the UAV integral fuel tank is cooled and shaped in the forming space. Step 4: After mold opening, drive the right core-pulling rod (53) and the left core-pulling rod (63) respectively, so that the right core-pulling block (52) and the left core-pulling block (62) exit from the side molding area of ​​the UAV integral fuel tank; Step 5: Through the gas connector (72), release gas is introduced into the mold core forming cavity (26), and the ejector plate (41) is driven to push the ejector rod (42) to push the integrated fuel tank of the UAV, so that the integrated fuel tank of the UAV is separated from the mold core forming cavity (26), and then the ejector assembly is reset through the reset rod (43).

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