A notebook computer shell lightweight structure injection molding equipment

Abstract

The application discloses a notebook shell lightweight structure injection molding equipment and relates to the technical field of plastic processing and injection molding. The notebook shell lightweight structure injection molding equipment comprises two bottom plates, a front mold frame, a rear mold frame, a front mold base, a rear mold base and a fixed plate. The front mold frame is fixedly arranged on the front mold frame bottom plate and is provided with a positioning guide column fixedly arranged on the front mold frame. The rear mold frame is fixedly arranged on the rear mold frame bottom plate and is slidably connected with the front mold frame through the positioning guide column. The front mold base is fixedly installed on the front mold frame and is internally provided with a cavity one. The rear mold base is fixedly installed on the rear mold frame and is internally provided with a cavity two. The cavity two can be combined with the cavity one to form an injection molding cavity. The fixed plate is slidably arranged on the rear mold frame bottom plate and is provided with a plurality of air-assisted ejector pin assemblies fixedly arranged on the fixed plate. The air-assisted ejector pin assembly comprises a guide rod and a push rod. The notebook shell lightweight structure injection molding equipment can guarantee the consistency of the demolding effect of each position of the mold, improve the product stability and the yield.

Description

Technical Field

[0001] This invention relates to the field of plastic processing and injection molding technology, specifically to an injection molding device for lightweight notebook shell structures. Background Technology

[0002] As electronic products become increasingly lightweight, thin, and portable, laptop casings commonly adopt a slim, integrated design. In existing technologies, injection molding of such large, thin-walled parts faces two main challenges: First, if air within the mold cavity cannot be quickly expelled during the molten plastic filling process, it easily leads to "trapped air," causing defects such as scorching, bubbles, and material shortages, severely affecting the product's appearance and structural strength. Although venting grooves can be created at the parting line or inserts, the venting effect is often unsatisfactory for deep cavities or complex structures. Second, due to the thin walls and large surface area of ​​the part, the contact area with the mold cavity is large, easily creating a strong vacuum suction effect after cooling and shrinkage. Traditional ejector pin methods require enormous ejection force to overcome this vacuum suction force, easily leading to damage such as "ejection whitening," stress whitening, or even perforation or deformation at the ejection point, resulting in low product yield.

[0003] Therefore, it is necessary to provide an injection molding device for lightweight notebook casing structures to solve the problems mentioned in the background art. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: a lightweight injection molding equipment for a notebook casing, comprising: a base plate, of which two are configured, namely a front mold base plate and a rear mold base plate; a front mold base, which is fixedly disposed on the front mold base plate, and a positioning guide post is fixedly disposed on the front mold base; a rear mold base, which is fixedly disposed on the rear mold base plate and slidably connected to the front mold base through the positioning guide post; a front mold base, which is fixedly installed on the front mold base and has a cavity inside; and a rear mold base, which is fixedly installed on... The rear mold base has a second cavity inside, which can fit with the first cavity to form an injection molding cavity; a fixed plate is slidably disposed on the bottom plate of the rear mold base, and multiple gas-assisted ejector pin assemblies are fixedly disposed on the fixed plate; wherein, the gas-assisted ejector pin assembly includes a guide rod and an ejector rod, the guide rod is fixedly disposed on the fixed plate, and the ejector rod is slidably disposed at the output end of the guide rod; wherein, the rear mold base has multiple through holes for the ejector rod to slide and multiple sliding holes for the guide rod to slide.

[0005] Preferably, the perforations are arranged circumferentially and have multiple exhaust grooves 1 along the axial direction, and the exhaust grooves 1 and the push rod form a first exhaust channel; multiple exhaust grooves 2 are provided on the outer sides of both cavity 1 and cavity 2, and the exhaust grooves 2 on cavity 1 and cavity 2 can fit together to form a second exhaust channel.

[0006] Preferably, the perforation near the guide rod has an air supply chamber, the air supply chamber near the guide rod has an air storage chamber, and the air storage chamber near the guide rod has multiple exhaust holes that penetrate the rear mold base.

[0007] Preferably, the air delivery chamber is provided with a guide groove, which includes a straight groove and a semi-circular arc groove; a guide block is fixedly provided on the push rod, and the guide block slides along the guide groove.

[0008] Preferably, the push rod is slidably equipped with a slip ring 1 and a slip ring 2. The outer surfaces of the slip ring 1 and the slip ring 2 are slidably and sealingly fitted with the cavity wall of the gas storage chamber. The slip ring 2 has multiple through holes along its circumference, and a slot is formed on the side of the through hole away from the exhaust port. The guide rod is slidably equipped with a push ring. Multiple blocking blocks are fixedly arranged along the circumference on the side of the push ring near the slip ring 2. The blocking blocks can be slidably and sealingly inserted into the through holes. A T-shaped pull rod is fixedly arranged on the blocking block. The pull rod can pass through the through hole and be engaged in the slot. There is a gap between the outer wall of the push ring and the cavity wall of the gas storage chamber.

[0009] Preferably, a retaining ring is fixedly provided on the guide rod, and a ring groove is provided on the push ring, so that the retaining ring can be engaged in the ring groove.

[0010] Preferably, a second guide block is fixedly provided on the guide rod; a sliding cavity is provided in the push rod for the guide rod to slide into, a spiral groove is provided in the sliding cavity, and a sliding groove is provided at the end of the spiral groove away from the guide rod along the axial direction of the push rod, and the second guide block is slidably provided along the spiral groove and the sliding groove.

[0011] Preferably, the length of the push rod is less than the sum of the lengths of the perforation, the gas delivery chamber, and the gas storage chamber, and the push rod has a spiral push surface; a support rod is fixedly provided on the side of the push ring near the push rod, and the support rod is slidably arranged along the spiral push surface.

[0012] Compared with the prior art, the present invention provides an injection molding device for lightweight notebook casing structures, which has the following beneficial effects:

[0013] This invention, through the design of an air-assisted ejector pin assembly and the linkage between venting and ejector rod pushing, enables the air in the injection cavity to be quickly and fully discharged from the first and second venting channels during the injection molding stage. This effectively avoids air entrapment and prevents surface defects in the injection molded parts caused by air entrapment. When ejecting the mold after injection molding, the slip ring slides before the ejector rod, pushing the gas in the air storage cavity out of the venting groove, thereby breaking the vacuum adhesion between the injection molded part and the mold cavity. Ejection then occurs subsequently or simultaneously, significantly improving performance. The initial ejection force is reduced, and the discharged gas can form an air mold, producing a good lubricating effect, which makes the ejection process smoother and greatly reduces damage such as whitening, ejection marks, local warping deformation or even cracking caused by excessive ejection force. Through the setting of push ring and slip ring II, it is ensured that even if there are slight differences in the air intake of each air storage cavity during the injection venting stage, the air storage cavity of each ejector rod can discharge gas at the same time during the ejection operation, thereby ensuring the consistency of the demolding effect at all positions of the mold and improving product stability and yield. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 This is a schematic diagram of the structure of the rear mold base and the fixing plate in this invention;

[0016] Figure 3 for Figure 2 Enlarged schematic diagram of section A in the middle;

[0017] Figure 4 This is a schematic diagram of the internal structure of the rear mold base in this invention;

[0018] Figure 5 for Figure 4 Enlarged schematic diagram of section B in the middle;

[0019] Figure 6 This is a schematic diagram of the guide rod structure in this invention;

[0020] Figure 7 This is a schematic diagram of the push ring structure in this invention;

[0021] Figure 8 This is a schematic diagram of the push rod structure in this invention;

[0022] In the diagram: 1. Base plate; 2. Front mold frame; 3. Rear mold frame; 4. Front mold base; 5. Rear mold base; 51. Through hole; 52. Sliding hole; 53. Exhaust groove one; 54. Exhaust groove two; 55. Air supply chamber; 551. Straight groove; 552. Arc groove; 56. Air storage chamber; 57. Exhaust hole; 6. Fixing plate; 7. Gas-assisted ejector pin assembly; 71. Guide rod; 711. Push ring; 712. Block; 713. Pull rod; 714. Snap ring; 715. Ring groove; 716. Guide block two; 717. Support rod; 72. Push rod; 721. Guide block one; 722. Slip ring one; 723. Slip ring two; 724. Through hole; 725. Snap groove; 726. Sliding cavity; 727. Spiral groove; 728. Sliding groove; 729. Spiral push surface. Detailed Implementation

[0023] Please see Figures 1 to 8 In this embodiment of the invention, a lightweight injection molding machine for a laptop casing includes a base plate 1, which has two components: a front mold base plate and a rear mold base plate. A front mold base 2 is fixedly mounted on the front mold base plate, and a positioning guide post is fixedly mounted on the front mold base 2. A rear mold base 3 is fixedly mounted on the rear mold base plate and slidably connected to the front mold base 2 via the positioning guide post. A front mold base 4 is fixedly mounted on the front mold base 2 and has a cavity inside. A mold base 5 is fixedly installed on the rear mold frame 3, and a second cavity is opened inside it. The second cavity can fit with the first cavity to form an injection molding cavity together. A fixing plate 6 is slidably disposed on the bottom plate of the rear mold frame. A plurality of gas-assisted ejector pin assemblies 7 are fixedly disposed on the fixing plate 6. The gas-assisted ejector pin assembly 7 includes a guide rod 71 and a push rod 72. The guide rod 71 is fixedly disposed on the fixing plate 6, and the push rod 72 is slidably disposed at the output end of the guide rod 71.

[0024] The rear mold base 5 is provided with multiple through holes 51 for sliding the push rod 72 and multiple sliding holes 52 for sliding the guide rod 71.

[0025] In this embodiment, the perforations 51 are arranged circumferentially and have multiple exhaust grooves 53 along the axial direction. The exhaust grooves 53 and the push rod 72 form a first exhaust channel. Multiple exhaust grooves 54 are provided on the outer sides of both the first cavity and the second cavity, and the exhaust grooves 54 on the first cavity and the second cavity can fit together to form a second exhaust channel.

[0026] In other words, during injection molding, the air inside the injection cavity can be fully discharged through multiple first exhaust channels and multiple second exhaust channels, effectively avoiding air entrapment and ensuring the injection molding quality of the laptop shell.

[0027] In this embodiment, the perforation 51 has an air supply chamber 55 at one end near the guide rod 71, the air supply chamber 55 has an air storage chamber 56 at one end near the guide rod 71, and the air storage chamber 56 has a plurality of exhaust holes 57 that penetrate the rear mold base 5 at one end near the guide rod 71.

[0028] It should be explained that the perforation 51, the air supply chamber 55, the air storage chamber 56, and the exhaust port 57 are interconnected. That is, during the injection molding process, the gas in the injection cavity will enter the air supply chamber 55 through the exhaust groove 53 on the perforation 51, then enter the air storage chamber 56, and then be discharged from the exhaust port 57.

[0029] In this embodiment, the push rod 72 is slidably and sealingly provided with a slip ring 722 and a slip ring 723. The outer surfaces of the slip ring 722 and the slip ring 723 are slidably and sealingly fitted to the cavity wall of the gas storage chamber 56. The slip ring 723 has multiple through holes 724 circumferentially opened, and a slot 725 is opened on the side of the through hole 724 away from the exhaust hole 57. The guide rod 71 is slidably provided with a push ring 711. Multiple blocking blocks 712 are fixedly provided circumferentially on the side of the push ring 711 near the slip ring 723. The blocking blocks 712 can be slidably and sealingly inserted into the through holes 724. A T-shaped pull rod 713 is fixedly provided on the blocking block 712. The pull rod 713 can pass through the through hole 724 and be inserted into the slot 725. There is a gap between the outer wall of the push ring 711 and the cavity wall of the gas storage chamber 56.

[0030] It should be noted that the pull rod 713 consists of a vertical rod and a horizontal rod arranged in a T-shape. The horizontal rod is fixedly mounted on the push ring 711, and the vertical rod is fixedly mounted on the horizontal rod. During the sliding of the pull rod 713 along the through hole 724, the horizontal rod will slide along the through hole 724, while the vertical rod itself is located on one side of the through hole 724, and its length is greater than the diameter of the through hole 724, that is, the vertical rod will not pass through the through hole 724.

[0031] In this embodiment, a retaining ring 714 is fixedly provided on the guide rod 71, and an annular groove 715 is provided on the push ring 711, so that the retaining ring 714 can be engaged in the annular groove 715.

[0032] In this embodiment, the air delivery chamber 55 is provided with a guide groove, which includes a straight groove 551 and a semi-circular arc groove 552; a guide block 721 is fixedly provided on the push rod 72, and the guide block 721 is slidably disposed along the guide groove.

[0033] A second guide block 716 is fixedly installed on the guide rod 71; a sliding cavity 726 is provided in the push rod 72 for the guide rod 71 to slide into, a spiral groove 727 is provided in the sliding cavity 726, and a sliding groove 728 is provided at the end of the spiral groove 727 away from the guide rod 71 along the axial direction of the push rod 72, and the second guide block 716 is slidably arranged along the spiral groove 727 and the sliding groove 728.

[0034] During implementation, after the front mold base 4 and the rear mold base 5 are closed, the slip ring 722 is located at the end of the air storage cavity 56 near the air delivery cavity 55, while the push ring 711 is located at the end of the air storage cavity 56 near the vent 57. The slip ring 723 is disengaged from the push ring 711, meaning the through hole 724 is open. When injection molding begins, the gas in the injection cavity is discharged through multiple first and second venting channels. The gas discharged from the first venting channel enters the air storage cavity 56 through the air delivery cavity 55. Simultaneously, as the gas enters, the slip ring 722 is pressed and slides along the air storage cavity 56, pushing the gas in the air storage cavity 56 out of the vent 57. After injection molding is completed, the fixed plate 6 is driven to slide, causing the guide rod 71 to slide along the... During the sliding of the cavity 726, the second guide block 716 slides along the spiral groove 727. Meanwhile, since the first guide block 721 is in the arc groove 552, the push rod 72 is restricted and will not slide with the guide rod 71. At this time, the push rod 72 will rotate, causing it to detach from the surface of the injection molded part. Simultaneously, the first guide block 721 slides along the arc groove 552 and into the straight groove 551. At this time, the second guide block 716 rotates out of the spiral groove 727 and slides into the slide groove 728. Then, the guide rod 71 continues to slide. When the second guide block 716 slides to the end of the slide groove 728, the guide rod 71 slides to the end of the cavity 726, thus pushing the push rod 72 out together, thereby ejecting the injection molded part from the rear mold base 5 and completing the demolding process.

[0035] It should be noted that when the guide block 716 slides to the end of the spiral groove 727, the retaining ring 714 is precisely engaged in the annular groove 715. Subsequently, the sliding of the guide rod 71 will cause the push ring 711 to slide together. The pull rod 713 on the push ring 711 will disengage from the retaining groove 725 and pass through the through hole 724. Then, the plug 712 will engage in the through hole 724, so that the slip ring 723 and the push ring 711 form a sealed push plate structure. When the push ring 711 contacts the slip ring 723, the guide block 716 has not slid to the end of the sliding groove 728. Then, the slip ring 723 will slide together with the guide rod 71. Since the slip ring 723 is in a sealed state at this time, the slip ring 722 will slide together with the slip ring 723, thus sealing the gas storage chamber. The gas in the gas storage chamber 56 is pushed out from the exhaust groove 53. When the slip ring 722 slides, the guide block 716 is still a distance away from the end of the slide groove 728. Therefore, before the guide rod 71 pushes the push rod 72 to push the injection molded part, the gas in the gas storage chamber 56 will be pushed out from the exhaust groove 53. Then the push rod 72 pushes the injection molded part. When the push rod 72 pushes, the gas in the gas storage chamber 56 can still be discharged from the exhaust groove 53. This achieves the effect of first venting to break the vacuum during the push, and then pushing and venting are carried out simultaneously. This effectively eliminates the vacuum, forms an air film lubrication, and significantly reduces the initial ejection force, protects the product and the mold, and avoids the phenomenon of white edges or local warping of the injection molded part after the push, thus ensuring product quality.

[0036] For ease of understanding, the slip ring 722 can be considered as a sliding partition. This partition divides the air storage cavity 56 into two parts: a first part near the air delivery cavity 55 and a second part near the vent 57. When injection molding begins, the slip ring 722 is located at the end of the air storage cavity 56 near the air delivery cavity 55. As injection molding proceeds, the gas in the cavity enters the first part of the air storage cavity 56 through the air delivery cavity 55, simultaneously pushing the slip ring 722 to slide. The sliding of the slip ring 722 further expels the air from the second part of the air storage cavity 56. When injection molding is completed and the mold is ejected, the push ring 711 pushes the slip ring 723 to slide, forming a sealed sliding plate with the slip ring 723. At this time, a sealed space will be formed between slip ring 1 722 and slip ring 2 723 in the second part of the gas storage cavity 56. Therefore, the sliding of slip ring 2 723 will push slip ring 1 722 to slide, so that the gas in the first part of the gas storage cavity 56 will be pushed into the cavity. Then, when the push is completed and reset, the push ring 711 will disengage from slip ring 2 723, so that the through hole 724 on slip ring 2 723 will open. Then the exhaust hole 57 will be connected to the second part of the gas storage cavity 56. Therefore, slip ring 1 722 will not slide during the reset process. As slip ring 2 723 slides, the gas in the second part of the gas storage cavity 56 will be replenished by drawing in external gas through the exhaust hole 57, and then the next injection molding operation can be performed.

[0037] In this embodiment, the length of the push rod 72 is less than the sum of the lengths of the perforation 51, the air supply chamber 55 and the air storage chamber 56. The push rod 72 is provided with a spiral push surface 729. The push ring 711 is fixedly provided with a support rod 717 on the side near the push rod 72. The support rod 717 is slidably provided along the spiral push surface 729.

[0038] It needs to be explained that the slip ring 723 itself has thickness. During the reset process after the push is completed, the guide rod 71 is also driven to slide along the sliding cavity 726. The guide block 716 will first slide along the sliding groove 728. Then, when the guide block 716 slides into the spiral groove 727, since the guide block 721 is in the straight groove 551 at this time, the push rod 72 cannot rotate. The guide rod 71 will then drive the push rod 72 to slide together. At the same time, the retaining ring 714 will also disengage from the ring groove 715, so that the guide rod 71 no longer pushes the push ring 711. Then, as the push rod 72 slides, the push rod 72 will push the push ring 711, causing the push ring 711 to disengage from the slip ring 723. The plug 712 will disengage from the through hole 724, and then the push ring 711 will continue to slide, causing the pull rod 713 to engage in the slot 725. That is, when the push ring 711 disengages from the slip ring 723, it will pull the slip ring 723 to slide together under the action of the pull rod 713. At this time, since the through hole 724 is in a conductive state, the sliding of the slip ring 723 will not drive the slip ring 722 to slide. That is, the slip ring 722 will remain at the end of the gas storage chamber 56 near the exhaust groove 53. Then, when the guide block 721 slides into the arc groove 552, the sliding of the push rod 72 is restricted, but the guide block 721 can rotate along the arc groove 552. At this time, the push rod 72 will rotate on its own axis, that is, the push rod 72 will be completely... During the reset and rotation of the push rod 72, the spiral push surface 729 rotates together, and the support rod 717 slides along the spiral push surface 729, further pushing the push ring 711 to slide away from the push rod 72. At this time, the sliding of the push ring 711 can still pull the sliding ring 723 to slide. Since the sliding ring 723 itself has thickness, part of the sliding ring 723 will disengage from the push rod 72, while the other part will remain in a sealed sliding connection with the push rod 72. Correspondingly, during the initial push, the sliding of the guide rod 71 will first drive the push rod 72 to rotate, and at the same time drive the spiral push surface 729 to rotate together, so that the spiral push surface 729 approaches the push ring 711. The end of the push rod 72 rotates away from the support rod 717, and the end of the spiral push surface 729 away from the push ring 711 rotates into the support range of the support rod 717. That is, after the push rod 72 rotates, the support rod 717 and the spiral push surface 729 will not contact each other, thus ensuring that the push ring 711 can slide against the push rod 72 when pushing, and can disengage from the push rod 72 when resetting after pushing. This ensures that the push ring 711 will first push the sliding ring 723 to slide when pushing, and then the push rod 72 will contact and push it to slide after the sliding ring 723 slides. This ensures that the ventilation work precedes the pushing work of the push rod 72, thereby achieving the optimal pushing effect and ensuring that the injection molded part will not be damaged by pushing.

[0039] Furthermore, during the injection molding process, due to the varying thickness of different parts of the injection molded part, the amount of air discharged from the injection cavity into each air storage chamber 56 may differ slightly. Based on this, a second slip ring 723 and a push ring 711 are installed so that when the guide rod 71 slides, both the second slip ring 723 and the push ring 711 slide from the end of the air storage chamber 56 closest to the vent hole 57. The air pressure between the second slip ring 723 and the first slip ring 722 drives the first slip ring 722 to slide. This ensures that regardless of the position of the first slip ring 722 in the multiple air storage chambers 56 during the venting phase, during the pushing operation, the first slip ring 722 in the multiple air storage chambers 56 can be driven to slide simultaneously. That is, before each push rod 72 pushes, the corresponding vent groove 53 will discharge gas, ensuring that the vacuum is effectively eliminated, thus ensuring optimal pushing effect and preventing damage to the injection molded part.

[0040] Specifically, in implementation, this invention, through the air-assisted ejector pin assembly 7 and the linkage design of venting and ejector rod 72, allows air in the injection cavity to be quickly and fully discharged from the first and second venting channels during the injection molding stage, effectively preventing air entrapment and surface defects in the injection molded part caused by air entrapment. When ejecting after injection molding, the slip ring 722 slides before the ejector rod 72, pushing the gas in the air storage cavity 56 out of the venting groove 53, thereby breaking the vacuum adhesion between the injection molded part and the mold cavity, followed by or simultaneously with the ejection action. This significantly reduces the initial ejection force, and the discharged gas can form an air mold, producing a good lubricating effect, thus making the ejection process smoother and greatly reducing damage such as whitening, ejection marks, local warping deformation, or even cracking caused by excessive ejection force. Furthermore, through the setting of push ring 711 and slip ring 723, it is ensured that even if there are slight differences in the air intake of each air storage cavity 56 during the injection venting stage, the air storage cavities 56 of each push rod 72 can discharge gas simultaneously during the ejection operation, thereby ensuring the consistency of the demolding effect at various positions of the mold and improving product stability and yield.

[0041] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An injection molding machine for lightweight notebook casing structures, characterized in that, include: The base plate (1) has two configurations, namely the front mold base plate and the rear mold base plate; A front mold frame (2) is fixedly mounted on the base plate of the front mold frame, and a positioning guide post is fixedly mounted on the front mold frame (2); The rear mold frame (3) is fixedly mounted on the bottom plate of the rear mold frame and is slidably connected to the front mold frame (2) through the positioning guide post; The front mold base (4) is fixedly installed on the front mold frame (2), and a cavity is opened inside it; The rear mold base (5) is fixedly installed on the rear mold frame (3), and a second cavity is opened inside it. The second cavity can fit with the first cavity to form an injection molding cavity together. A fixed plate (6) is slidably disposed on the bottom plate of the rear mold frame, and a plurality of gas-assisted ejector pin assemblies (7) are fixedly disposed on the fixed plate (6); The gas-assisted ejector assembly (7) includes a guide rod (71) and a push rod (72). The guide rod (71) is fixedly mounted on the fixed plate (6), and the push rod (72) is slidably mounted on the output end of the guide rod (71). The rear mold base (5) is provided with a plurality of through holes (51) for sliding of the push rod (72) and sliding holes (52) for sliding of the guide rod (71); The perforations (51) are arranged in a circumferential array and have multiple exhaust grooves (53) along the axial direction. The exhaust grooves (53) and the push rod (72) form a first exhaust channel. Multiple exhaust grooves (54) are provided on the outer sides of both cavity one and cavity two, and the exhaust grooves (54) on cavity one and cavity two can fit together to form a second exhaust channel; The perforation (51) has an air supply chamber (55) at one end near the guide rod (71), and an air storage chamber (56) is provided at one end near the guide rod (71). The air storage chamber (56) has multiple exhaust holes (57) that penetrate the rear mold base (5) at one end near the guide rod (71). The push rod (72) is provided with a sliding ring 1 (722) and a sliding ring 2 (723). The outer surfaces of the sliding ring 1 (722) and the sliding ring 2 (723) are sealed and slidably fitted to the cavity wall of the gas storage chamber (56). The sliding ring 2 (723) has multiple through holes (724) circumferentially opened. The through holes (724) have a groove (725) on the side away from the exhaust hole (57). A push ring (711) is slidably disposed on the guide rod (71). A plurality of plugs (712) are fixedly disposed circumferentially on the side of the push ring (711) near the slip ring (723). The plugs (712) can be sealed and slid into the through hole (724). A T-shaped pull rod (713) is fixedly disposed on the plug (712). The pull rod (713) can pass through the through hole (724) and be inserted into the slot (725). There is a gap between the outer wall of the push ring (711) and the cavity wall of the gas storage chamber (56).

2. The injection molding equipment for lightweight notebook casing according to claim 1, characterized in that, The gas delivery chamber (55) is provided with a guide groove, which includes a straight groove (551) and a semi-circular arc groove (552). A guide block (721) is fixedly installed on the push rod (72), and the guide block (721) is slidably installed along the guide groove.

3. The injection molding equipment for lightweight notebook casing according to claim 1, characterized in that, A retaining ring (714) is fixedly provided on the guide rod (71), and an annular groove (715) is provided on the push ring (711), and the retaining ring (714) can be inserted into the annular groove (715).

4. The lightweight injection molding equipment for a notebook casing according to claim 1, characterized in that, A second guide block (716) is fixedly installed on the guide rod (71); The push rod (72) has a sliding cavity (726) for the guide rod (71) to slide into. The sliding cavity (726) has a spiral groove (727). The end of the spiral groove (727) away from the guide rod (71) has a sliding groove (728) along the axial direction of the push rod (72). The guide block two (716) is slidably arranged along the spiral groove (727) and the sliding groove (728).

5. The lightweight injection molding equipment for a notebook casing according to claim 1, characterized in that, The length of the push rod (72) is less than the sum of the lengths of the perforation (51), the gas delivery chamber (55) and the gas storage chamber (56), and a spiral push surface (729) is provided on the push rod (72); A support rod (717) is fixedly provided on the side of the push ring (711) near the push rod (72), and the support rod (717) is slidably provided along the spiral push surface (729).

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