Large thin shell injection mold and forming method thereof

Abstract

The invention provides a large thin shell injection mold and a forming method thereof. The large thin shell injection mold comprises a lower mold base, a mounting cavity is formed in the lower mold base, and an ejection assembly is mounted in the mounting cavity; the ejection assembly comprises a limiting plate, an ejection block, a guide sleeve, a supporting pipe, a spring, a fixing ring, a spherical seat, a supporting roller, two supporting seats, a sliding seat, a lead screw and a driving motor. And the guide sleeve is fixedly connected to the upper surface of the limiting plate. The driving motor drives the lead screw to rotate, the supporting roller makes contact with the spherical seats, the supporting pipe drives the ejecting block to move upwards, the ejecting block ejects the large thin shell part in the mold cavity, and therefore demolding of the large thin shell part is achieved, along with movement of the supporting roller, the supporting roller makes contact with the spherical seats at different positions in sequence and is in a wave state, and demolding is achieved. And therefore, different positions of the large thin shell can be sequentially ejected and demolded, and the situation that the large thin shell is pulled to be cracked when a plurality of point positions are ejected at the same time is avoided.

Description

Technical Field

[0001] The invention relates to an injection mold and a molding method thereof, in particular to a large thin shell injection mold and a molding method thereof, belonging to the technical field of injection molds. Background Art

[0002] An injection mold is a tool used for mass production of plastic products. It primarily consists of a movable mold and a fixed mold, which, when closed, form a complete cavity and gating system. Its operating principle is to inject molten plastic into the mold cavity via an injection molding machine. After cooling and solidification, the product is separated from the mold using an ejector mechanism and other devices, resulting in a plastic part with a specific shape and size. Injection molds offer high precision, complexity, and wear resistance, making them widely used in a variety of industries, including automotive, electronics, home appliances, and aerospace. They are key process equipment for achieving automated and large-scale production of plastic molding processes.

[0003] Injection molds face many unique challenges when molding large, thin-shell parts. Due to their large size, some products can reach several meters in length and width, and their extremely thin wall thickness, typically 2mm or less, this structural characteristic significantly increases the difficulty of demolding. Compared to ordinary injection molded parts, when the plastic melt cools and solidifies in the mold cavity, it shrinks and fits tightly to the cavity. Large, thin-shell parts have a significantly higher total clamping force than small parts due to their large contact area (such as the large core surface area), and greater friction must be overcome during ejection.

[0004] Furthermore, the thin-walled structure of large thin shell parts results in relatively weak mechanical properties. During the demolding process, if the ejection mechanism is poorly designed or operates inconsistently, uneven ejection can easily cause deformation or cracking of the plastic part. Once such problems occur, not only will the product qualification rate be significantly reduced, production costs will increase, and the entire production cycle may be affected. Therefore, an injection mold for large thin shell parts and a molding method thereof are proposed. Summary of the Invention

[0005] In view of this, the present invention provides a large thin shell injection mold and a molding method thereof to solve or alleviate the technical problems existing in the prior art and at least provide a beneficial option.

[0006] The technical solution of the embodiment of the present invention is achieved as follows: a large thin shell injection mold includes a lower mold base, an installation cavity is provided inside the lower mold base, and an ejection assembly is installed inside the installation cavity;

[0007] The ejection assembly includes a limit plate, an ejector block, a guide sleeve, a support tube, a spring, a fixing ring, a spherical seat, a support roller, two support seats, a sliding seat, a screw and a drive motor;

[0008] The guide sleeve is fixedly connected to the upper surface of the limit plate. The lower surface of the top block fits against the top end of the support tube. The support tube is slidably connected to the inside of the limit plate. The fixed ring is fixedly connected to the outer sidewall of the support tube. The spherical seat is fixedly connected to the bottom end of the support tube. A spring is sleeved on the outer sidewall of the support tube. The support roller is mounted on the upper surface of the sliding seat through two support seats. The lead screw is rotatably connected to the inside of the lower die base. One end of the lead screw is fixedly connected to the output shaft of the driving motor.

[0009] Further preferably, the limit plate is fixedly connected to the inner sidewall of the installation cavity. The support tube is slidably connected to the inner sidewall of the guide sleeve. The bottom end of the spring abuts against the upper surface of the fixed ring. The top end of the spring abuts against the lower surface of the limit plate.

[0010] Further preferably, a mold cavity is formed on the upper surface of the lower die base. A through hole is formed on the inner bottom wall of the mold cavity. The through hole communicates with the installation cavity. The support tube is slidably connected to the inside of the through hole. The lower surface of the top block fits against the inner bottom wall of the through hole.

[0011] Further preferably, the sliding seat is threadedly connected to the outer sidewall of the lead screw. Two guide rods are slidably connected to the inside of the sliding seat. The guide rods are fixedly connected to the inner sidewall of the installation cavity. The driving motor is mounted on one side of the lower die base. The position of the spherical seat corresponds to the position of the support roller.

[0012] Further preferably, the ejection assembly further includes an air pipe joint, a connecting rod, a guide ring, air holes and a tension spring;

[0013] The air pipe joint is fixedly connected to the outer sidewall of the support tube and communicates with the support tube. The top end of the connecting rod is fixedly connected to the lower surface of the top block. The guide ring is fixedly connected to the bottom of the outer sidewall of the connecting rod. The air holes are evenly formed in the inside of the guide ring. The tension spring is located inside the support tube.

[0014] Further preferably, the connecting rod is located inside the support tube. The guide ring is slidably connected to the inner sidewall of the support tube. The top end of the tension spring is fixedly connected to the lower surface of the guide ring. The bottom end of the tension spring is fixedly connected to the inner bottom wall of the support tube.

[0015] Further preferably, the air pipe joint is located below the guide ring. The air pipe joint is located below the fixed ring.

[0016] Further preferably, an upper die base is attached to the upper surface of the lower die base. A mold core is mounted on the lower surface of the upper die base. An injection hole is formed on the upper surface of the upper die base. The shape of the mold core is adapted to the shape of the mold cavity.

[0017] Further preferably, a guide pillar is fixedly connected to the lower surface of the upper die base, a guide sleeve is embedded in the upper surface of the lower die base, and the guide pillar is inserted into the inner side wall of the guide sleeve.

[0018] A large thin-shell part injection molding method includes the following steps:

[0019] Mold clamping and injection molding: The upper die base and the lower die base are clamped, and plastic melt is injected into the mold cavity through the injection hole. With the cooperation of the mold core, a large thin-shell part is formed in the mold cavity;

[0020] Mold opening: The upper die base and the lower die base are separated, and the large thin-shell part adheres to the inside of the mold cavity;

[0021] Mechanical ejection: The driving motor drives the lead screw to rotate, the lead screw drives the sliding seat to slide, the support roller slides along the guide rod. During the movement, the outer wall of the support roller contacts the spherical seat at the corresponding position in sequence. After the spherical seat is pushed upward, it drives the support tube, and the support tube jacks up the large thin-shell part to perform the initial ejection and demolding of the large thin-shell part;

[0022] Air blowing ejection: While the large thin-shell part is being mechanically ejected, high-pressure gas flows into the support tube through the air pipe joint. The gas flows upward through the air holes and jacks up the top block. The top block separates from the support tube, and then the high-pressure gas flows into the space between the large thin-shell part and the mold cavity, and the large thin-shell part separates from the mold cavity;

[0023] Product removal; After mechanical ejection and air blowing ejection, the large thin-shell part separates from the mold cavity, and the product is taken out of the mold cavity.

[0024] Due to the adoption of the above technical solutions in the embodiments of the present invention, it has the following advantages:

[0025] 1. In the present invention, the driving motor drives the lead screw to rotate, and the support roller contacts the spherical seat. Due to its spherical shape, it can be pushed upward. The spherical seat drives the support tube, and the support tube drives the top block to move upward. The top block jacks up the large thin-shell part in the mold cavity, thereby realizing the demolding of the large thin-shell part. As the support roller moves, the support roller contacts the spherical seats at different positions in sequence, showing a wave state, and thus can eject and demold different positions of the large thin-shell part in sequence, avoiding the situation that the large thin-shell part is torn when multiple points are jacked up simultaneously;

[0026] Second, while the large thin-shell part is mechanically ejected in the present invention, high-pressure gas flows into the interior of the support tube through the tracheal joint, then the high-pressure gas flows upward through the air holes and jacks up the top block, separating the top block from the support tube. Then, the high-pressure gas flows into the gap between the large thin-shell part and the mold cavity from the gap between the top block and the support tube. The gas pushes the large thin-shell part, promoting the separation of the large thin-shell part from the mold cavity, thereby enhancing the ejection and demolding effect of the large thin-shell part product, avoiding the adhesion of the large thin-shell part product, and further, during the entire demolding process, the large thin-shell part will not be deformed or torn, improving the product qualification rate and reducing the production cost.

[0027] The above summary is only for the purpose of the specification and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will be readily apparent by reference to the drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0029] Figure 1 Structural diagram of an injection mold for a large thin-shell part of the present invention;

[0030] Figure 2 Structural diagram of the upper mold base of the present invention;

[0031] Figure 3 Structural diagram of the lower mold base of the present invention;

[0032] Figure 4 Schematic diagram of the installation position of the ejection assembly of the present invention;

[0033] Figure 5 Structural diagram of the limit plate of the present invention;

[0034] Figure 6 Structural diagram of the spherical seat of the present invention;

[0035] Figure 7 Structural diagram of the guide ring of the present invention;

[0036] Figure 8 Structural diagram of the support roller of the present invention.

[0037] Reference numerals: 101, ejection assembly; 11, limit plate; 12, ejector block; 13, guide sleeve; 14, support tube; 15, spring; 16, fixing ring; 17, spherical seat; 18, air pipe joint; 20, connecting rod; 21, guide ring; 22, air hole; 23, tension spring; 24, support roller; 25, support seat; 26, sliding seat; 27, guide rod; 28, lead screw; 29, drive motor; 31, lower mold base; 32, mold cavity; 33, through hole; 34, installation cavity; 35, guide bushing; 36, upper mold base; 37, mold core; 38, guide pillar; 39, injection hole. Detailed implementation manners

[0038] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present invention. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0039] The embodiments of the present invention will be described in detail below with reference to the drawings.

[0040] As Figures 1 - 8 shown, the embodiment of the present invention provides an injection mold for large thin-shell parts, including a lower mold base 31. An installation cavity 34 is arranged inside the lower mold base 31, and an ejection assembly 101 is installed inside the installation cavity 34. The ejection assembly 101 is used to eject the large thin-shell part from the inside of the installation cavity 34 to realize the demolding of the large thin-shell part. Moreover, during the process of ejection and demolding, the large thin-shell part will not be deformed or cracked, improving the product qualification rate and reducing the production cost;

[0041] The ejection assembly 101 includes a limit plate 11, an ejector block 12, a guide sleeve 13, a support tube 14, a spring 15, a fixing ring 16, a spherical seat 17, a support roller 24, two support seats 25, a sliding seat 26, a lead screw 28 and a drive motor 29;

[0042] The guide sleeve 13 is fixedly connected to the upper surface of the limit plate 11. The support tube 14 is slidably connected inside the limit plate 11 and slidably connected to the inner side wall of the guide sleeve 13. Through the cooperation of the guide sleeve 13 and the limit plate 11, the position of the support tube 14 can be limited, and the support tube 14 can vertically lift along the guide sleeve 13, so as to realize the ejection and demolding of the large thin-shell part;

[0043] The lower surface of the top block 12 fits against the top end of the support tube 14. The fixing ring 16 is fixedly connected to the outer side wall of the support tube 14. A spring 15 is sleeved on the outer side wall of the support tube 14. By pushing the fixing ring 16 through the spring 15, the fixing ring 16 drives the support tube 14, enabling the support tube 14 to slide downward along the guide sleeve 13. The support tube 14 drives the top block 12. Through the cooperation between the top block 12 and the mold cavity 32, a forming cavity can be formed, thereby realizing the forming of large thin-shell parts products.

[0044] The spherical seat 17 is fixedly connected to the bottom end of the support tube 14. The support roller 24 is installed on the upper surface of the sliding seat 26 through two support seats 25. The lead screw 28 is rotatably connected to the inside of the lower mold base 31. One end of the lead screw 28 is fixedly connected to the output shaft of the driving motor 29. The sliding seat 26 is threadedly connected to the outer side wall of the lead screw 28. By driving the lead screw 28 to rotate through the driving motor 29, the lead screw 28 drives the sliding seat 26 through the thread, and the sliding seat 26 drives the support roller 24, so that the support roller 24 can contact the spherical seat 17. After the spherical seat 17 contacts the support roller 24, due to its spherical shape, it can be pushed upward. The spherical seat 17 drives the support tube 14, and the support tube 14 drives the top block 12 to move upward. The top block 12 jacks up the large thin-shell part in the mold cavity 32, thereby realizing the demolding of the large thin-shell part. As the support roller 24 moves, the support roller 24 contacts the spherical seat 17 at different positions in sequence, showing a wavy state, and can thus eject and demold different positions of the large thin-shell part in sequence, avoiding the situation that the large thin-shell part is torn when multiple points are jacked up simultaneously.

[0045] In one embodiment, the limiting plate 11 is fixedly connected to the inner side wall of the installation cavity 34. The bottom end of the spring 15 abuts against the upper surface of the fixing ring 16, and the top end of the spring 15 abuts against the lower surface of the limiting plate 11. The upper surface of the lower mold base 31 is provided with a mold cavity 32, and a through hole 33 is provided on the inner bottom wall of the mold cavity 32. The through hole 33 communicates with the installation cavity 34. The support tube 14 is slidably connected to the inside of the through hole 33. The lower surface of the top block 12 fits against the inner bottom wall of the through hole 33. The position of the support tube 14 can be limited by the limiting plate 11. Under the push of the spring 15, the support tube 14 drives the top block 12 to move downward, and the top block 12 fits against the inner bottom wall of the through hole 33, and then the through hole 33 can be blocked by the top block 12, ensuring the product quality during injection molding.

[0046] In one embodiment, two guide rods 27 are slidably connected to the inside of the sliding seat 26. The guide rods 27 are fixedly connected to the inner side wall of the installation cavity 34. The driving motor 29 is installed on one side of the lower mold base 31. The position of the sliding seat 26 can be limited by the guide rods 27, enabling the sliding seat 26 to slide along the guide rods 27.

[0047] In one embodiment, the ejector assembly 101 further includes an air pipe joint 18, a connecting rod 20, a guide ring 21, air holes 22, and a tension spring 23;

[0048] The air pipe joint 18 is fixedly connected to the outer sidewall of the support pipe 14 and communicates with the support pipe 14. The air pipe joint 18 is communicated with an external high-pressure air pump through a connecting pipe;

[0049] The top end of the connecting rod 20 is fixedly connected to the lower surface of the ejector block 12. The guide ring 21 is fixedly connected to the bottom of the outer sidewall of the connecting rod 20. The position of the connecting rod 20 can be defined through the guide ring 21, and the connecting rod 20 will not shake when moving in the support pipe 14;

[0050] The air holes 22 are evenly formed in the inside of the guide ring 21. The tension spring 23 is located inside the support pipe 14, the connecting rod 20 is located inside the support pipe 14, the guide ring 21 is slidably connected to the inner sidewall of the support pipe 14. The top end of the tension spring 23 is fixedly connected to the lower surface of the guide ring 21, and the bottom end of the tension spring 23 is fixedly connected to the inner bottom wall of the support pipe 14. The guide ring 21 is pulled by the tension spring 23, the guide ring 21 drives the connecting rod 20 to move downward, and the connecting rod 20 drives the ejector block 12, so that the ejector block 12 can be closely attached to the top end of the support pipe 14.

[0051] In one embodiment, the air pipe joint 18 is located below the guide ring 21 and below the fixed ring 16. When air-blowing and ejecting a large thin-shell part, high-pressure gas flows into the inside of the support pipe 14 through the air pipe joint 18, and then the high-pressure gas flows upward through the air holes 22 and jacks up the ejector block 12, so that the ejector block 12 is separated from the support pipe 14. Then the high-pressure gas flows from the gap between the ejector block 12 and the support pipe 14 into the space between the large thin-shell part and the mold cavity 32, and the gas pushes the large thin-shell part to separate the large thin-shell part from the mold cavity 32.

[0052] In one embodiment, an upper mold base 36 is attached to the upper surface of the lower mold base 31. A mold core 37 is installed on the lower surface of the upper mold base 36. An injection hole �9 is formed on the upper surface of the upper mold base 36. The shape of the mold core 37 is adapted to the shape of the mold cavity 32. A guide post 38 is fixedly connected to the lower surface of the upper mold base 36, and a guide sleeve 35 is embedded in the upper surface of the lower mold base 31. The guide post 38 is inserted into the inner sidewall of the guide sleeve 35. During the mold closing process, the injection molding machine drives the upper mold base 36 and the lower mold base 31 to close the mold, and the guide post 38 is inserted into the inside of the guide sleeve 35. The guide post 38 and the guide sleeve 35 can play a role in guiding and limiting. Then, plastic melt is injected into the mold cavity 32 through the injection hole 39. With the cooperation of the mold core 37 and the mold cavity 32, the large thin-shell part is formed in the mold cavity 32.

[0053] An injection molding method for a large thin-shell part includes the following steps:

[0054] Clamping and injection molding: The upper mold base and the lower mold base are clamped, and plastic melt is injected into the mold cavity through the injection hole. With the cooperation of the mold core, a large thin-shell part is formed in the mold cavity;

[0055] Mold opening: The upper mold base and the lower mold base are separated, and the large thin-shell part adheres to the inside of the mold cavity;

[0056] Mechanical ejection: The driving motor drives the screw rod to rotate, the screw rod drives the sliding seat to slide, and the support roller slides along the guide rod. During the movement, the outer wall of the support roller contacts the spherical seat at the corresponding position in sequence. After the spherical seat is pushed upward, it drives the support tube, and the support tube jacks up the large thin-shell part to perform the initial ejection and demolding of the large thin-shell part;

[0057] Air blowing ejection: While the large thin-shell part is being mechanically ejected, high-pressure gas flows into the support tube through the air pipe joint. The gas flows upward through the air holes and jacks up the ejector block. The ejector block separates from the support tube, and then the high-pressure gas flows between the large thin-shell part and the mold cavity, and the large thin-shell part separates from the mold cavity;

[0058] Product removal; After mechanical ejection and air blowing ejection, the large thin-shell part separates from the mold cavity, and the product is removed from the mold cavity.

[0059] When the present invention is in operation: The upper die base 36 and the lower die base 31 are respectively installed on an injection molding machine. During the mold closing process, the injection molding machine drives the upper die base 36 to close with the lower die base 31. The guide pillar 38 is inserted into the inside of the guide sleeve 35, and the guide pillar 38 and the guide sleeve 35 can play a role in guiding and limiting. Then, the plastic melt is injected into the mold cavity 32 through the injection hole 39. Under the cooperation of the mold core 37 and the mold cavity 32, the large thin-shell part is formed in the mold cavity 32. The injection molding machine drives the upper die base 36 to separate from the lower die base 31, and the large thin-shell part adheres to the inside of the mold cavity 32. The driving motor 29 drives the lead screw 28 to rotate. The lead screw 28 drives the sliding seat 26 through the thread, and the sliding seat 26 drives the support roller 24, so that the support roller 24 can contact the spherical seat 17. After the spherical seat 17 contacts the support roller 24, due to its spherical shape, it is pushed upward. The spherical seat 17 drives the support tube 14, and the support tube 14 drives the top block 12 to move upward. The top block 12 jacks up the large thin-shell part in the mold cavity 32, thus realizing the demolding of the large thin-shell part. As the support roller 24 moves, the support roller 24 contacts the spherical seats 17 at different positions in sequence, showing a wave state, and thus can eject and demold different positions of the large thin-shell part in sequence. While mechanically ejecting the large thin-shell part, high-pressure gas flows into the inside of the support tube 14 through the air pipe joint 18. Then, the high-pressure gas flows upward through the air holes 22 and jacks up the top block 12, causing the top block 12 to separate from the support tube 14. Then, the high-pressure gas flows from the gap between the top block 12 and the support tube 14 into the space between the large thin-shell part and the mold cavity 32. The gas pushes the large thin-shell part, prompting the large thin-shell part to separate from the mold cavity 32. After mechanical ejection and air blowing ejection, the large thin-shell part separates from the mold cavity 32, and the product can be taken out from the mold cavity 32;

[0060] Compared with the prior art, when the present invention mechanically ejects the large thin-shell part, it ejects and demolds different positions of the large thin-shell part in sequence, avoiding the situation that the large thin-shell part is torn when multiple points are jacked up simultaneously. Moreover, at the same time, it is combined with air blowing ejection, enhancing the ejection and demolding effect of the large thin-shell part product and avoiding the situation of adhesion of the large thin-shell part product. Therefore, during the entire demolding process, the large thin-shell part will not be deformed or torn, improving the qualified rate of the product and reducing the production cost.

[0061] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various changes or substitutions, and these should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. An injection mold for large thin-shell parts, comprising a lower mold base (31), characterized in that: An installation cavity (34) is arranged inside the lower die base (31), and an ejection assembly (101) is installed inside the installation cavity (34); The ejection assembly (101) includes a limiting plate (11), an ejector block (12), a guide sleeve (13), a support tube (14), a spring (15), a fixing ring (16), a spherical seat (17), a support roller (24), two support seats (25), a sliding seat (26), a lead screw (28) and a driving motor (29); The guide sleeve (13) is fixedly connected to the upper surface of the limiting plate (11), the lower surface of the ejector block (12) is attached to the top end of the support tube (14), the support tube (14) is slidably connected to the inside of the limiting plate (11), the fixing ring (16) is fixedly connected to the outer side wall of the support tube (14), the spherical seat (17) is fixedly connected to the bottom end of the support tube (14), a spring (15) is sleeved on the outer side wall of the support tube (14), the support roller (24) is installed on the upper surface of the sliding seat (26) through two support seats (25), the lead screw (28) is rotatably connected to the inside of the lower die base (31), and one end of the lead screw (28) is fixedly connected to the output shaft of the driving motor (29).

2. The injection mold for a large thin-shell part according to claim 1, characterized in that: The limiting plate (11) is fixedly connected to the inner side wall of the installation cavity (34), the support tube (14) is slidably connected to the inner side wall of the guide sleeve (13), the bottom end of the spring (15) abuts against the upper surface of the fixing ring (16), and the top end of the spring (15) abuts against the lower surface of the limiting plate (11).

3. The injection mold for large thin-shell parts according to claim 2, wherein: A die cavity (32) is formed on the upper surface of the lower die base (31), a through hole (33) is formed on the inner bottom wall of the die cavity (32), the through hole (33) communicates with the installation cavity (34), the support tube (14) is slidably connected to the inside of the through hole (33), and the lower surface of the ejector block (12) is attached to the inner bottom wall of the through hole (33).

4. The injection mold for a large thin-shell part according to claim 3, wherein: The sliding seat (26) is threadedly connected to the outer side wall of the lead screw (28), two guide rods (27) are slidably connected to the inside of the sliding seat (26), the guide rods (27) are fixedly connected to the inner side wall of the installation cavity (34), the driving motor (29) is installed on one side of the lower die base (31), and the position of the spherical seat (17) corresponds to the position of the support roller (24).

5. A large thin-shell part injection mold according to claim 1, characterized in that: The ejection assembly (101) further includes an air pipe joint (18), a connecting rod (20), a guide ring (21), air holes (22) and a tension spring (23); The air pipe joint (18) is fixedly connected to the outer side wall of the support tube (14) and communicates with the support tube (14), the top end of the connecting rod (20) is fixedly connected to the lower surface of the ejector block (12), the guide ring (21) is fixedly connected to the bottom of the outer side wall of the connecting rod (20), the air holes (22) are uniformly formed in the inside of the guide ring (21), and the tension spring (23) is located inside the support tube (14).

6. The injection mold for a large thin-shell part according to claim 5, characterized in that: The connecting rod (20) is located inside the support tube (14). The guiding ring (21) is slidably connected to the inner side wall of the support tube (14). The top end of the tension spring (23) is fixedly connected to the lower surface of the guiding ring (21), and the bottom end of the tension spring (23) is fixedly connected to the inner bottom wall of the support tube (14).

7. The injection mold for large thin-shell parts according to claim 6, characterized in that: The air pipe joint (18) is located below the guiding ring (21) and below the fixing ring (16).

8. The injection mold for a large thin-shell part according to claim 1, wherein: The upper surface of the lower mold base (31) is fitted with an upper mold base (36). The lower surface of the upper mold base (36) is provided with a mold core (37). The upper surface of the upper mold base (36) is provided with an injection hole (39). The shape of the mold core (37) is adapted to the shape of the mold cavity (32).

9. The injection mold for a large thin-shell part according to claim 8, wherein: The lower surface of the upper mold base (36) is fixedly connected with a guide post (38). The upper surface of the lower mold base (31) is embedded with a guide sleeve (35). The guide post (38) is inserted into the inner side wall of the guide sleeve (35).

10. A method for injection molding of a large thin-shell part, applied to the large thin-shell part injection mold according to any one of claims 1-9, characterized in that, It includes the following steps: Mold closing and injection molding: The upper mold base and the lower mold base are closed. Plastic melt is injected into the mold cavity through the injection hole. With the cooperation of the mold core, a large thin-shell part is formed in the mold cavity. Mold opening: The upper mold base and the lower mold base are separated, and the large thin-shell part adheres to the inside of the mold cavity. Mechanical ejection: The driving motor drives the lead screw to rotate. The lead screw drives the sliding seat to slide. The support roller slides along the guide rod. During the movement, the outer wall of the support roller contacts the spherical seat at the corresponding position in sequence. After the spherical seat is pushed upward, it drives the support tube, and the support tube jacks up the large thin-shell part to perform the primary ejection and demolding of the large thin-shell part. Air blowing ejection: While the large thin-shell part is being mechanically ejected, high-pressure gas flows into the support tube through the air pipe joint. The gas flows upward through the air holes and jacks up the top block. The top block is separated from the support tube. Then the high-pressure gas flows into the space between the large thin-shell part and the mold cavity, and the large thin-shell part is separated from the mold cavity. Product removal: After mechanical ejection and air blowing ejection, the large thin-shell part is separated from the mold cavity, and the product is taken out of the mold cavity.

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