An injection mold for plastic packaging products and its injection method

Abstract

The present invention relates to the technical field of plastic injection molding processing, and specifically discloses an injection mold for plastic packaging products and an injection molding method thereof, which includes a mold, a moving mold and a driving mechanism arranged on an injection molding machine. A forming rod is arranged on the moving mold, a mold hole adapted to the forming rod is formed on the mold, and an adsorption device is arranged on the forming rod. The adsorption device includes a forming ring arranged on the moving mold, an air extraction mechanism and an adjustment mechanism. The forming ring is sleeved on the forming rod, and an air extraction pipe is arranged inside the forming ring. The air extraction mechanism is connected to the air extraction pipe and is used to supply air to the air extraction pipe. The adjustment mechanism includes a blocking plate for controlling the opening and closing of the air extraction pipe and an adjustment component. The blocking plate is slidably matched with the forming ring. After the product is injection molded, the forming ring abuts against the product, and the air extraction pipe is opened. The air extraction mechanism adsorbs the product through the air extraction pipe. An injection mold for plastic packaging products and an injection molding method thereof according to the present invention can improve the injection molding effect of the injection mold.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic injection molding processing, and particularly relates to an injection mold for plastic packaging products and an injection molding method thereof. Background Art

[0002] Plastic packaging products are a kind of materials widely used in the packaging industry. They are mainly made of synthetic or natural polymer resins and various additives are added to enhance their properties. Plastic packaging is one of the four major materials in the packaging industry, ranking alongside paper and cardboard, metal, and glass, occupying an important position in the market. The production of plastic packaging products involves various processes, such as thermoforming, injection molding, blow molding, extrusion, etc. These processes can process plastic products with functions such as packaging, storage, protection, cushioning, and isolation. Plastic injection molding is a common plastic processing method, mainly used for producing plastic products with complex shapes and precise dimensions. This process involves heating the plastic material to a molten state and then injecting it into the cavity of a closed mold under the pressure of an injection molding machine. After cooling, a formed product is obtained. This process can efficiently and mass-produce plastic products of various shapes and sizes.

[0003] The main devices for injection molding include an injection molding machine, an injection device, and a mold clamping device. An injection molding machine usually consists of an injection device, a mold clamping device, and an injection mold. The injection device is responsible for heating and plasticizing the plastic and injecting it into the mold, while the mold clamping device is used to close the mold and perform the opening and closing actions of the mold. The injection molding process can be roughly divided into the following stages: mold clamping, injection, holding pressure, cooling, mold opening, and product removal. The repeated execution of these process steps can achieve the mass production of products.

[0004] The Chinese patent application document with the publication number CN118024489B discloses a preform injection mold for preventing crystallization of PET materials, including an injection platform. An injection device is arranged at the upper end of the injection platform. The injection device includes a first fixed seat, a second fixed seat, and a moving mold. A linkage opening and closing device is arranged at the upper end of the second fixed seat. The linkage opening and closing device includes a protective cover, a contact component, and a linkage feeding component. A solidification prevention device is arranged at one output end of the linkage opening and closing device. The solidification prevention device includes a support seat and a storage tank. A feeding pipe for discharging materials is connected through the lower end of the storage tank; during actual operation, the operator stores sufficient raw materials in the storage tank and plugs in an external power supply to drive the hydraulic component and the conveying motor. The hydraulic component drives and controls the moving mold and the mold to close towards the injection cavity seat. The top block contacts the contact block, triggering the operation of the contact component. Under the linkage effect, the switch valve plate two and the switch valve plate one inside the feeding pipe rotate synchronously, realizing the automatic opening and closing of the injection port and the discharging port. Moreover, in the horizontal displacement state of the first connecting rod, the linkage rod moves accordingly and drives the push plate and the push column to move. When the push column moves horizontally outwards, the tooth block moves accordingly. The outer teeth of the tooth block are adaptively meshed with the outer surface of the second gear. At this time, the second gear rotates accordingly, and the first bevel gear meshes and rotates with the outer surface of the second gear, thereby driving the synchronous rotation of the second connecting rod and the switch valve plate two. At this time, the discharging port of the feeding pipe is opened, realizing the automatic feeding of the injection tank.

[0005] In the above technology, during the demolding process of the moving mold and the mold, the preform is not easily demolded from the cavity of the mold, which affects the appearance quality of the preform and results in a poor injection effect of the injection mold. Summary of the Invention

[0006] The present invention provides a plastic packaging product injection mold and its injection method, aiming to solve the technical problem in the prior art that during the demolding process of the moving mold and the mold, the preform is not easily demolded from the cavity of the mold, which affects the appearance quality of the preform and results in a poor injection effect of the injection mold.

[0007] In a first aspect, an injection mold for a plastic packaging product of the present invention includes a mold, a moving mold disposed on an injection molding machine, and a driving mechanism disposed on the injection molding machine and used to drive the moving mold to move. A forming rod is disposed on the moving mold, a mold hole adapted to the forming rod is formed on the mold, and an adsorption device is disposed on the forming rod. The adsorption device includes a forming ring disposed on the moving mold, an air extraction mechanism, and an adjusting mechanism. The forming ring is sleeved on the forming rod, and an air extraction pipe for adsorbing a product is disposed inside the forming ring. The air extraction mechanism is connected to the air extraction pipe and used to supply air to the air extraction pipe. The adjusting mechanism includes a blocking plate for controlling the opening and closing of the air extraction pipe and an adjusting component for driving the blocking plate to move. The blocking plate is slidably engaged with the forming ring. After the product is injection molded, the forming ring abuts against the product, and the air extraction pipe is opened, and the air extraction mechanism adsorbs the product through the air extraction pipe.

[0008] By adopting the above technical solution, through the setting of the adsorption device, after the product is injection molded, the adjusting component drives the blocking plate to slide, so that the air extraction pipe is opened, and the air extraction mechanism adsorbs the product through the air extraction pipe. When the product is demolded from the mold, it is easier, thereby avoiding affecting the appearance quality of the product and improving the injection molding effect of the injection mold.

[0009] Preferably, the adjusting component includes an adjusting sleeve installed on the mold, a support plate installed on the forming ring, a lifting rod slidably engaged with the support plate, and a first elastic member disposed on the lifting rod and used to drive the lifting rod to reset. The lifting rod is connected to the blocking plate. When the moving mold slides towards the mold, the adjusting sleeve pushes the lifting rod to descend, driving the blocking plate to close the air extraction pipe.

[0010] Preferably, an inclined surface is formed on the adjusting sleeve, and an inclined surface adapted to the inclined surface is disposed at the top end of the lifting rod.

[0011] Preferably, a cooling cavity is formed inside the forming rod, a cooling channel communicating with the cooling cavity is formed on the forming rod, and an air supply mechanism for inputting cooling gas into the cooling channel is disposed on the moving mold.

[0012] By adopting the above technical solution, through the setting of the air supply mechanism, cooling gas can be input into the cooling cavity and the cooling channel, thereby enabling rapid cooling of the product and further improving the injection molding effect and efficiency of the product.

[0013] Preferably, the forming ring is rotatably engaged on the moving mold, and a rotating device is disposed on the moving mold. The rotating device includes a gear for driving the forming ring to rotate, a rotating component disposed on the moving mold and used to drive the gear to rotate, and a torsion spring for driving the forming ring to reset.

[0014] By adopting the above technical solution, through the arrangement of the rotating device, when the rotating assembly works, it can drive the gear to rotate, and then drive the forming ring to rotate, so that the air extraction pipe is communicated with the cooling channel, and the cooling gas in the cooling channel can enter the product through the air extraction pipe to efficiently cool the product.

[0015] Preferably, the rotating assembly includes a fixing plate installed on the moving mold, a rack seat slidably matched with the fixing plate horizontally, and a rack plate slidably matched with the rack seat vertically. An elastic part is arranged between the rack plate and the rack seat. When the rack plate slides horizontally on one side, it drives the gear to rotate, and when it slides horizontally on the other side, the gear does not rotate.

[0016] Preferably, the teeth of the rack plate are provided with inclined guiding surfaces and right-angled surfaces.

[0017] Preferably, a linkage device is arranged on the fixing plate. The linkage device includes an adjusting plate arranged on the rack seat, a pressing rod arranged on the mold, and an elastic member II arranged between the fixing plate and the rack seat. One end of the adjusting plate is provided with a pressing inclined surface.

[0018] By adopting the above technical solution, through the arrangement of the linkage device, when the forming rod slides out of the mold hole, the pressing rod no longer presses the adjusting plate. At this time, the elastic restoring force of the elastic member II can drive the rack seat to slide, and then drive the rack plate to slide. During the sliding process of the rack plate, the rotation of the gear can be realized, so that when the forming ring rotates, it drives the air extraction pipe to rotate towards the cooling channel, realizing the efficient cooling of the product, and making the rotation adjustment of the forming ring more convenient.

[0019] Preferably, the moving mold includes a movable seat and a mold base. The forming rod is arranged on the mold base, the forming ring is arranged on the movable seat, and a driving member for driving the movable seat to slide is arranged on the mold base.

[0020] In a second aspect, an injection molding method for a plastic packaging product of the present invention uses the above-mentioned injection molding mold for a plastic packaging product, and it includes the following steps:

[0021] Forming: The driving mechanism drives the moving mold to move towards the mold, and the forming rod is inserted into the mold hole. Then, the injection molding machine injects the liquid material into the mold, and the product is formed in the mold.

[0022] Mold opening: After the product is formed in the mold, the adjusting assembly drives the blocking plate to move. At this time, the air extraction pipe is opened, and the air extraction mechanism is started to adsorb the product through the air extraction pipe. Then, the driving mechanism drives the moving mold to move away from the mold to complete the forming process of the product.

[0023] By adopting the above technical solution, through the setting of the adsorption device, after the product is molded, the air extraction mechanism can adsorb the product, and when the product is demolded from the mold, it is easier, improving the injection molding effect of the injection mold.

[0024] The beneficial effects of the present invention are as follows:

[0025] 1. In the present invention, through the setting of the adsorption device, after the product is injection molded, the regulating component drives the plugging plate to slide, so that the air extraction pipe is opened, and the air extraction mechanism adsorbs the product through the air extraction pipe. When the product is demolded from the mold, it is easier, thereby avoiding affecting the appearance quality of the product and improving the injection molding effect of the injection mold;

[0026] 2. In the present invention, through the setting of the air supply mechanism, cooling gas can be input into the cooling cavity and the cooling channel, thereby realizing the rapid cooling of the product and further improving the injection molding effect and efficiency of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of the overall structure of the present invention.

[0028] Figure 2 is Figure 1 a partial enlarged view of part A in

[0029] Figure 3 is a partial cross-sectional view showing the connection relationship between the adsorption device and the forming rod of the present invention.

[0030] Figure 4 is Figure 3 a partial enlarged view of part B in

[0031] Figure 5 is a schematic diagram showing the structure of the hole of the present invention.

[0032] Figure 6 is Figure 5 a partial enlarged view of part C in

[0033] Reference numerals:

[0034] 1. Injection molding machine; 2. Mold; 21. Hole; 3. Moving mold; 31. Forming rod; 311. Cooling cavity; 312. Cooling channel; 32. Movable seat; 33. Mold base; 34. Driving part; 4. Adsorption device; 41. Forming ring; 42. Air extraction pipe; 43. Plugging plate; 44. Regulating component; 441. Adjusting sleeve; 442. Support plate; 443. Lifting rod; 444. First elastic member; 5. Rotating device; 51. Gear; 52. Rotating component; 521. Fixed plate; 522. Rack seat; 523. Rack plate; 524. Elastic part; 53. Torsion spring; 6. Linkage device; 61. Adjusting plate; 62. Extrusion rod; 63. Second elastic member. Detailed Embodiments

[0035] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0036] Referring to Figures 1-6 , an injection mold for plastic packaging products of the present invention includes a mold 2 fixedly arranged on an injection molding machine 1, a moving mold 3, and a driving mechanism arranged on the injection molding machine 1 and used to drive the movement of the moving mold 3. The moving mold 3 is arranged opposite to the mold 2, and the moving mold 3 is slidably matched with the injection molding machine 1. A forming rod 31 is arranged on the moving mold 3, and a mold hole 21 adapted to the forming rod 31 is formed in the mold 2. When injection molding processing of plastic packaging products is required, first start the driving mechanism to drive the moving mold 3 to slide towards the mold 2. The moving mold 3 drives the forming rod 31 to slide. After the forming rod 31 slides into the mold hole 21, the moving mold 3 stops sliding. At this time, the injection molding machine 1 injects the liquid material, and the product is injection molded in the mold hole 21. After the processing is completed, the driving mechanism drives the moving mold 3 to slide, the forming rod 31 slides out of the mold hole 21, and drives the processed product to move. Subsequently, the product on the forming rod 31 is taken off to complete the injection molding processing of the product.

[0037] Referring to Figure 1 , Figure 3 and Figure 4 , the moving mold 3 includes a movable seat 32 and a mold base 33. Both the movable seat 32 and the mold base 33 are slidably matched with the injection molding machine 1. The forming rod 31 is fixedly arranged on the mold base 33, and the forming rod 31 is slidably matched with the movable seat 32. A driving member 34 for driving the movable seat 32 to slide is arranged on the mold base 33. The driving member 34 can directly adopt a hydraulic cylinder. The cylinder body of the driving member 34 is fixedly connected to the mold base 33, and the piston rod of the driving member 34 is fixedly connected to the movable seat 32.

[0038] Referring to Figure 1 , Figure 3 and Figure 4 , an adsorption device 4 is arranged on the forming rod 31. The adsorption device 4 includes a forming ring 41 arranged on the movable seat 32, an air extraction mechanism, and an adjustment mechanism. The air extraction mechanism can directly adopt a pipeline and a blower. The forming ring 41 is sleeved on the forming rod 31, and an air extraction pipe 42 for adsorbing the product is fixedly arranged in the forming ring 41. The air extraction pipe 42 is an L-shaped pipe. An air extraction channel is formed in the forming rod 31. The air extraction channel is a T-shaped structure. The air extraction channel includes a horizontal section arranged along the length direction of the forming rod 31 and a vertical section communicated with the horizontal section. One end of the vertical section penetrates the forming rod 31. The air extraction mechanism is communicated with the air extraction pipe 42 through the air extraction channel and is used to supply air to the air extraction pipe 42.

[0039] Referring to Figure 3 ,Figure 4 and Figure 5 The adjusting mechanism includes a sealing plate 43 for controlling the opening and closing of the air extraction pipe 42 and an adjusting component 44 for driving the movement of the sealing plate 43. An arc surface is provided at the bottom end of the sealing plate 43, and the sealing plate 43 is slidably fitted to the forming ring 41 in the vertical direction. The adjusting component 44 includes an adjusting sleeve 441 fixedly installed on the mold 2, a support plate 442 fixedly installed on the forming ring 41, a lifting rod 443 slidably fitted on the support plate 442, and a first elastic member 444 provided on the lifting rod 443 and used to drive the lifting rod 443 to reset. The support plate 442 is an L-shaped rod, the lifting rod 443 is fixedly connected to the sealing plate 43, an inclined surface is provided on the adjusting sleeve 441, and an inclined surface adapted to the inclined surface is provided at the top end of the lifting rod 443. The first elastic member 444 can directly adopt a spring. One end of the first elastic member 444 is fixedly connected to the support plate 442, and the other end is fixedly connected to the lifting rod 443. When the moving mold 3 slides towards the mold 2, one end of the lifting rod 443 abuts against the adjusting sleeve 441, and when the moving mold 3 continues to slide towards the mold 2, the adjusting sleeve 441 can push the lifting rod 443 to descend, stretch the first elastic member 444, and drive the sealing plate 43 to close the air extraction pipe 42. After the product is injection-molded, at this time, the forming ring 41 abuts against the product, and the air extraction pipe 42 is opened, and the air extraction mechanism adsorbs the product through the air extraction pipe 42.

[0040] Referring to Figure 3 and Figure 4 Two cooling cavities 311 are provided in the forming rod 31. The cooling cavities 311 are of a semi-circular structure, and the two cooling cavities 311 are symmetrically arranged with respect to the central axis of the forming rod 31. The air extraction channel is located between the two cooling cavities 311 and is not communicated with the cooling cavities 311. A cooling channel 312 communicated with the cooling cavities 311 is provided on the forming rod 31. The cooling channel 312 runs through, and a gas supply mechanism for inputting cooling gas into the cooling channel 312 is provided on the moving mold 3.

[0041] Referring to Figures 1-3 The forming ring 41 is rotatably fitted on the moving mold 3. A rotating device 5 is provided on the moving mold 3. The rotating device 5 is used to drive the forming ring 41 to rotate. The rotating device 5 includes a gear 51 for driving the forming ring 41 to rotate, a rotating component 52 provided on the moving mold 3 and used to drive the gear 51 to rotate, and a torsion spring 53 for driving the forming ring 41 to reset. The gear 51 is fixedly arranged on the outer peripheral surface of the forming ring 41. One end of the torsion spring 53 is fixedly connected to the inner wall of the forming ring 41, and a slider (not shown in the figure) is fixedly arranged on the other end. The slider is slidably fitted on the forming rod 31 along the length direction of the forming rod 31.

[0042] Referring to Figures 1-3The rotating assembly 52 includes a fixed plate 521 fixedly mounted on the movable mold 3, a rack seat 522 horizontally slidably fitted on the fixed plate 521, and a rack plate 523 vertically slidably fitted in the rack seat 522. The teeth of the rack plate 523 are provided with inclined guide surfaces and right-angle surfaces. An elastic portion 524 is fixedly provided between the rack plate 523 and the rack seat 522. The elastic portion 524 can directly adopt a spring. When the rack plate 523 slides in the horizontal direction, the inclined guide surface of the teeth on the rack plate 523 slides toward the gear 51. At this time, the gear 51 can push the rack plate 523 down and compress the elastic portion 524. At this time, the gear 51 does not rotate; when the rack plate 523 slides in the opposite direction, the right-angle surface of the gear 51 can push the gear 51. At this time, the gear 51 rotates, driving the molding ring 41 to rotate.

[0043] Reference Figure 2 , Figure 5 and Figure 6 A linkage device 6 is provided on the fixed plate 521, and the linkage device 6 includes an adjusting plate 61 fixedly provided on the rack seat 522, an extrusion rod 62 fixedly provided on the mold 2, and an elastic member 63 fixedly provided between the fixed plate 521 and the rack seat 522. The elastic member 63 can directly adopt a spring. An extrusion inclined surface is provided at the end of the adjusting plate 61 away from the movable mold 3, an arc surface is provided at the end of the extrusion rod 62 close to the adjusting plate 61, and a groove for sliding the adjusting plate 61 is provided on the mold 2.

[0044] The implementation principle of the plastic packaging product injection mold of the present invention is as follows: when the plastic packaging product injection molding process is required, the driving mechanism is first started to drive the movable mold 3 to slide toward the mold 2, and the movable mold 3 drives the molding rod 31 to slide. When the molding rod 31 is about to slide into the mold hole 21, one end of the adjustment plate 61 abuts against one end of the extrusion rod 62 (its state is as shown in FIG. Figure 6 As shown in the figure, when the movable mold 3 continues to slide toward the mold 2, the molding rod 31 slides into the molding hole 21, and the extrusion rod 62 pushes the adjustment plate 61 to slide close to the molding rod 31, driving the rack seat 522 to slide close to the molding rod 31 and stretching the elastic member 63. The rack plate 523 slides in the horizontal direction. When the inclined guide surface of the teeth on the rack plate 523 slides toward the gear 51, the gear 51 can push the rack plate 523 down and compress the elastic part 524. At this time, the gear 51 does not rotate. After one end of the extrusion rod 62 slides out from the extrusion inclined surface of the adjustment plate 61, the extrusion rod 62 continues to slide along the surface of the adjustment plate 61 in the length direction.

[0045] Meanwhile, when the moving mold 3 slides towards the fixed mold 2, one end of the lifting rod 443 abuts against the adjusting sleeve 441. When the moving mold 3 continues to slide towards the fixed mold 2, the adjusting sleeve 441 can push the lifting rod 443 downwards, stretching the first elastic member 444, driving the sealing plate 43 to close the air extraction pipe 42. At this time, the moving mold 3 stops sliding, and the injection molding machine 1 injects the liquid material, and the product is injection molded in the mold hole 21. After the processing is completed, the driving mechanism drives the moving mold 3 to slide. At this time, the adjusting sleeve 441 no longer pushes the lifting rod 443 downwards, and the first elastic member 444 releases the elastic restoring force, driving the lifting rod 443 to rise, driving the sealing plate 43 to rise. At this time, the sealing plate 43 no longer blocks the air extraction pipe 42, and the air extraction pipe 42 is opened. The air extraction mechanism is started, and vacuum pumping is carried out through the air extraction pipe 42 to adsorb the end face of the product, so that the product can be stably fixed on the forming rod 31;

[0046] The air supply mechanism is opened to supply cold air into the cooling cavity 311 to cool the forming rod 31 and cool the product. When the forming rod 31 slides out of the mold hole 21, one end of the extrusion rod 62 slides out from the surface in the length direction of the adjusting plate 61 and enters the extrusion inclined surface of the adjusting plate 61. When the extrusion rod 62 no longer extrudes the adjusting plate 61, the elastic part 524 releases the elastic restoring force, driving the rack seat 522 to slide in a direction away from the forming rod 31 and driving the rack plate 523 to slide. At this time, the right-angle surface of the gear 51 can push the gear 51, and at this time, the gear 51 rotates, driving the forming ring 41 to rotate 90°, compressing the torsion spring 53. The air extraction pipe 42 in the forming ring 41 is communicated with the cooling channel 312. The air extraction mechanism is closed. At the same time, the cold air stored in the cooling cavity 311 and the cold air passing through the cooling channel 312 are conveyed to the product through the air extraction pipe 42 to quickly cool the product. When the rack plate 523 no longer meshes with the gear 51, at this time, the torsion spring 53 releases the elastic restoring force, driving the forming ring 41 to reset;

[0047] When the product is cooled, at this time, the mold base 33 no longer moves. Then the driving member 34 is started to drive the movable seat 32 to slide towards the fixed mold 2, driving the forming ring 41 to slide. The side surface of the forming ring 41 can push the product, so that the product can fall off from the forming rod 31, completing the injection molding operation of the product.

[0048] Referring to Figures 1-6 the present invention also provides an injection molding method for plastic packaging products, which includes the following steps:

[0049] Forming: The driving mechanism drives the moving mold 3 to move towards the fixed mold 2, and the forming rod 31 is inserted into the mold hole 21. Then the injection molding machine 1 injects the liquid material into the fixed mold 2, and the product is formed in the fixed mold 2;

[0050] Mold opening: After the product is formed in the mold 2, the adjustment component 44 drives the plugging plate 43 to move. At this time, the air extraction pipe 42 is opened, and the air extraction mechanism is started to adsorb the product through the air extraction pipe 42. Subsequently, the driving mechanism drives the moving mold 3 to move away from the mold 2 to complete the forming process of the product.

[0051] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0052] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0053] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as a limitation to the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A plastic packaging product injection mold, comprising a mold (2) arranged on an injection molding machine (1), a movable mold (3), and a driving mechanism arranged on the injection molding machine (1) and used to drive the movable mold (3) to move, the movable mold (3) being provided with a molding rod (31), and the mold (2) being provided with a molding hole (21) adapted to the molding rod (31), characterized in that: A suction device (4) is provided on the molding rod (31), the suction device (4) comprising a molding ring (41) provided on the movable mold (3), an exhaust mechanism and an adjustment mechanism; the molding ring (41) is sleeved on the molding rod (31), and an exhaust pipe (42) for adsorbing the product is provided inside the molding ring (41); the exhaust mechanism is connected to the exhaust pipe (42) and is used to supply air to the exhaust pipe (42); the adjustment mechanism comprises a blocking plate (43) for controlling the opening and closing of the exhaust pipe (42) and an adjustment component (44) for driving the blocking plate (43) to move; the blocking plate (43) is slidably matched with the molding ring (41); after the product is injection molded, the molding ring (41) abuts against the product, and the exhaust pipe (42) is opened, and the exhaust mechanism adsorbs the product through the exhaust pipe (42); A cooling cavity (311) is provided in the molding rod (31), and a cooling channel (312) communicating with the cooling cavity (311) is provided on the molding rod (31); The molding ring (41) is rotationally engaged with the movable mold (3), and a rotating device (5) is provided on the movable mold (3). The rotating device (5) comprises a gear (51) for driving the molding ring (41) to rotate, a rotating assembly (52) provided on the movable mold (3) and for driving the gear (51) to rotate, and a torsion spring (53) for driving the molding ring (41) to return to its original position.

2. The plastic packaging product injection mold according to claim 1, characterized in that: The adjustment assembly (44) comprises an adjustment sleeve (441) mounted on the mold (2), a support plate (442) mounted on the molding ring (41), a lifting rod (443) slidably engaged with the support plate (442), and an elastic member (444) disposed on the lifting rod (443) and used to drive the lifting rod (443) to reset. The lifting rod (443) is connected to the sealing plate (43). When the movable mold (3) slides toward the mold (2), the adjustment sleeve (441) pushes the lifting rod (443) to descend, thereby driving the sealing plate (43) to close the exhaust pipe (42).

3. The plastic packaging product injection mold according to claim 2, characterized in that: The adjusting sleeve (441) is provided with an inclined surface, and the top end of the lifting rod (443) is provided with an inclined surface matching the inclined surface.

4. The plastic packaging product injection mold according to claim 1, characterized in that: The movable mold (3) is provided with a gas supply mechanism for inputting cooling gas into the cooling channel (312).

5. The plastic packaging product injection mold according to claim 1, characterized in that: The rotating assembly (52) comprises a fixed plate (521) mounted on the movable mold (3), a rack seat (522) horizontally slidably engaged with the fixed plate (521), and a rack plate (523) vertically slidably engaged with the rack seat (522), an elastic portion (524) being provided between the rack plate (523) and the rack seat (522), and when the rack plate (523) slides along one side in the horizontal direction, the gear (51) is driven to rotate, and when the rack plate (523) slides along the other side in the horizontal direction, the gear (51) does not rotate.

6. The plastic packaging product injection mold according to claim 5, characterized in that: The teeth of the rack plate (523) are provided with inclined guide surfaces and right-angle surfaces.

7. The plastic packaging product injection mold according to claim 5, characterized in that: A linkage device (6) is provided on the fixed plate (521), the linkage device (6) comprising an adjustment plate (61) provided on the rack seat (522), an extrusion rod (62) provided on the mold (2), and a second elastic member (63) provided between the fixed plate (521) and the rack seat (522), and an extrusion slope is provided at one end of the adjustment plate (61).

8. The plastic packaging product injection mold according to claim 1, characterized in that: The movable mold (3) comprises a movable seat (32) and a mold base (33), a molding rod (31) is arranged on the mold base (33), a molding ring (41) is arranged on the movable seat (32), and a driving member (34) is arranged on the mold base (33) for driving the movable seat (32) to slide.

9. A method for injection molding of plastic packaging products, characterized in that: The plastic packaging product injection mold according to any one of claims 1 to 8 comprises the following steps: Molding: the driving mechanism drives the movable mold (3) to move toward the mold (2), and the molding rod (31) is inserted into the mold hole (21), and then the injection molding machine (1) injects liquid material into the mold (2), and the product is molded in the mold (2); Mold opening: After the product is formed in the mold (2), the adjustment component (44) drives the blocking plate (43) to move. At this time, the air suction pipe (42) is opened, and the air suction mechanism is started to adsorb the product through the air suction pipe (42). Then, the driving mechanism drives the movable mold (3) to move away from the mold (2), thereby completing the molding process of the product.

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