One-piece PP milk bottle injection molding process

Abstract

The present invention relates to an injection molding process for an integrally formed PP milk bottle, comprising the following steps: S1: putting raw materials for making a PP milk bottle into an injection molding machine; S2: closing a combined injection mold by a mold opening and closing mechanism; S3: after the combined injection mold is closed, injecting melted raw materials into the combined injection mold by the injection molding machine; S4: opening the combined injection mold by the mold opening and closing mechanism, and in the process of opening the mold, the mold opening and closing mechanism drives a demoulding mechanism to eject an integrally formed PP milk bottle embryo from the combined injection mold and make it fall on a feeding mechanism; S5: after the embryo is demoulded and falls on the feeding mechanism, executing step S2, and in step S2, the mold opening and closing mechanism also drives the demoulding mechanism to reset, and at the same time, the combined injection mold drives the feeding mechanism to convey the obtained embryo out during the process of closing the mold; S6: cyclically executing steps S2-S5 to perform continuous injection molding production of the integrally formed PP milk bottle embryo.

Description

Technical Field

[0001] The invention relates to the field of milk bottle injection molding, in particular to an integrally formed PP milk bottle injection molding process. Background Art

[0002] PP baby bottles are made of PP (polypropylene) material, which is recognized worldwide as a safe material for making food containers. It does not contain the carcinogen bisphenol A, is temperature-resistant to 110°C, and is very tough, resistant to falling, and has very strong impact resistance.

[0003] In the one-piece injection molding process of PP milk bottles, it is usually not convenient to separate the formed embryo from the mold, which increases the difficulty of the process and is not convenient for continuous batch production. In view of this, we propose an one-piece injection molding process for PP milk bottles. Summary of the invention

[0004] The purpose of the present invention is to provide an integrally formed PP milk bottle injection molding process to solve the problems raised in the above background technology. To achieve the above purpose, the present invention provides the following technical solutions: an integrally formed PP milk bottle injection molding process, comprising an injection molding machine arranged on a frame, the injection molding process comprising the following steps:

[0005] S1: putting the raw materials for making PP milk bottles into the injection molding machine, and the injection molding machine heats and pressurizes the raw materials;

[0006] S2: Clamping the combined injection mold through the mold opening and closing mechanism;

[0007] S3: After the combined injection mold is closed, the melted raw material is injected into the combined injection mold by the injection molding machine, and after the injection molding is completed, the combined injection mold is cooled by the cooling system;

[0008] S4: After the combined injection mold is cooled, the combined injection mold is opened by the mold opening and closing mechanism, and during the mold opening process, the mold opening and closing mechanism drives the demoulding mechanism to eject the obtained one-piece formed PP milk bottle embryo from the combined injection mold and make it fall on the feeding mechanism, and the feeding mechanism is arranged on the frame, and during the mold opening process of the combined injection mold, the air pump mechanism is driven to convey air into the embryo, so that the air ejects the embryo from the combined injection mold, thereby improving the demoulding effect;

[0009] S5: After the embryo is demoulded and falls on the feeding mechanism, step S2 is executed, and in step S2, the mold opening and closing mechanism also drives the demoulding mechanism to reset, and the combined injection mold drives the feeding mechanism to convey the obtained embryo during the mold closing process;

[0010] S6: cyclically executing steps S2-S5 to perform continuous one-piece injection molding production of PP milk bottle embryos, and timely feeding the raw materials for making PP milk bottles into the injection molding machine according to production needs.

[0011] Preferably, the feeding mechanism includes a conveying frame fixed on the frame, both ends of the conveying frame are connected to rollers for fixed-axis rotation, and the two rollers are connected through a conveyor belt transmission, a bracket is fixed on the conveying frame, and a hanging plate is fixed on the bracket, the hanging plate is located above the conveyor belt, the opening and closing mold mechanism and the combined injection mold are arranged on the hanging plate, and an air pump mechanism is arranged on the bracket.

[0012] Preferably, the combined injection mold includes a core mold and two symmetrically arranged half molds, the two half molds are matched to cover the lower half of the core mold, so that a mold cavity is formed between the two half molds and the core mold, a demolding mechanism is provided on the core mold, and the opening and closing mold mechanism is transmission connected to the demolding mechanism, and the two half molds are respectively transmission connected to the air pump mechanism and one of the rollers.

[0013] Preferably, the core mold passes through and is fixedly connected to the middle of the hanging plate, the upper end of the core mold is integrally and fixedly connected with an injection tube, an injection channel is arranged through the center position of the injection tube and the core mold, the upper end of the injection channel is connected to the injection port of the injection molding machine, and a control valve is arranged at the lower end of the injection channel.

[0014] Preferably, the bottom surface of the hanging plate is symmetrically provided with guide grooves on both sides of the core mold, and sliders are slidably connected in the guide grooves, and the upper ends of the two half molds are fixedly connected to the two sliders respectively.

[0015] Preferably, the mold opening and closing mechanism includes an axis frame two fixed on the upper surface of the hanging plate, an axis frame two is rotatably connected to an axis rod, the axis rod is transmission-connected to a motor fixed on the hanging plate, an axis frame one corresponding to the two half-molds is fixed on the bottom surface of the hanging plate, a screw sleeve one passes through the axis frame one and is rotatably connected to the axis, two ends of the axis rod are respectively transmission-connected to the two screw sleeves one through a pulley assembly one, a screw rod passes through the screw sleeve one and is threadedly connected, the screw rod is fixedly connected to the outer side wall of the corresponding half-mold, and the guide groove and the screw rod are arranged parallel to each other, and the two screws are respectively fixedly connected to a rack and a push-pull rod.

[0016] Preferably, a ratchet is rotatably connected to the bracket via a fixed axis, an outer ring of the ratchet is meshingly connected to the rack, and an inner ring of the ratchet is transmission-connected to one of the rollers via a pulley assembly 2.

[0017] Preferably, the demolding mechanism includes a lifting plate with an avoidance hole, the injection tube passes through the avoidance hole, the shaft is provided with two sections of external threads with opposite rotation directions, and two screw sleeves 2 are sleeved and threadedly connected on the two sections of the external threads, the lifting plate is connected to the two screw sleeves 2 through two connecting rods, and the two ends of the connecting rods are respectively hinged to the lifting plate and the corresponding screw sleeves 2 through ball joints.

[0018] Preferably, a cylindrical cavity is provided in the core mold, and a groove connected to the cylindrical cavity is provided on the bottom surface of the core mold, and a top block is matched in the groove, a push rod is provided in the cylindrical cavity, and a gap is left between the outer wall of the push rod and the inner wall of the cylindrical cavity, the lower end of the push rod is fixedly connected to the top block, the upper end of the push rod passes through and is slidably connected to the top wall of the cylindrical cavity, and the upper end of the push rod is sleeved with a sleeve, the sleeve is fixed to the bottom surface of the lifting plate, and the end of the push rod located in the sleeve is connected to the bottom surface of the lifting plate through a spring.

[0019] Preferably, the air pumping mechanism includes a pump barrel fixed on the bracket, a piston plate is slidably connected inside the pump barrel, and the push-pull rod is fixedly connected to the piston plate, a one-way valve 1 and a one-way valve 2 are fixed and connected on the end wall of the pump barrel, and the one-way valve 2 is connected to the cylindrical cavity through an air pipe, the conduction direction of the one-way valve 1 points to the pump barrel, and the conduction direction of the one-way valve 2 points to the cylindrical cavity.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] In the present invention, the combined injection mold is opened by a mold opening and closing mechanism, and during the mold opening process, the mold opening and closing mechanism drives the demoulding mechanism to eject the obtained one-piece formed PP bottle embryo from the combined injection mold and make it fall on the feeding mechanism, thereby realizing automatic demoulding while the mold is opened, thereby reducing the demoulding difficulty and helping to improve the injection molding efficiency. During the mold opening process of the combined injection mold, the air pump mechanism is driven to transport air into the embryo so that the air ejects the embryo from the combined injection mold, thereby improving the demoulding efficiency and effect.

[0022] In the present invention, after the embryo is demolded and falls on the feeding mechanism, the combined injection mold is driven by the mold opening and closing mechanism to close the mold, and the mold opening and closing mechanism also drives the demolding mechanism to reset at the same time. At the same time, the combined injection mold drives the feeding mechanism during the mold closing process to automatically convey the obtained embryo out, thereby realizing automatic feeding after demolding, saving time and labor, reducing labor intensity, and improving the degree of automation, thereby realizing continuous injection molding production of one-piece PP milk bottle embryos, greatly improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The schematic diagram of the cross-sectional structure of the general assembly of the present invention is shown in FIG. Figure 1 ;

[0024] Figure 2for Figure 1 A is an enlarged structural diagram;

[0025] Figure 3 The schematic diagram of the cross-sectional structure of the general assembly of the present invention is shown in FIG. Figure 2 ;

[0026] Figure 4 for Figure 3 The enlarged structural diagram at B in FIG.

[0027] In the figure: 1, injection molding machine; 2, conveyor frame; 3, roller; 4, conveyor belt; 5, bracket; 6, hanging plate; 7, shaft frame 1; 8, screw sleeve 1; 9, screw; 10, half mold; 11, pulley assembly 1; 12, shaft frame 2; 13, shaft rod; 14, screw sleeve 2; 15, connecting rod; 16, lifting plate; 17, guide slide; 18, slider; 19, rack; 20, ratchet; 21, pulley assembly 2; 22, pump barrel; 23, piston plate; 24, push-pull rod; 25, one-way valve 1; 26, one-way valve 2; 27, air pipe; 28, core mold; 29, injection tube; 30, injection channel; 31, sleeve; 32, spring; 33, ejector rod; 34, cylindrical cavity; 35, groove; 36, ejector block; 37, control valve. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technical personnel in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figures 1 to 4 The present invention provides a technical solution: an integrated PP milk bottle injection molding process, comprising an injection molding machine 1 arranged on a frame, the frame is not drawn in the present application, and the injection molding process comprises the following steps:

[0030] S1: putting the raw materials for making PP milk bottles into the injection molding machine 1, and the injection molding machine 1 heats and pressurizes the raw materials;

[0031] S2: Clamping the combined injection mold through the mold opening and closing mechanism;

[0032] S3: After the combined injection mold is closed, the melted raw material is injected into the combined injection mold by the injection molding machine 1, and after the injection is completed, the injection molding machine 1 and the control valve 37 are closed, and the combined injection mold is cooled by the cooling system. The cooling system cools the embryo in the mold cavity by conveying cooling water to the water channel in the combined injection mold;

[0033] S4: After the combined injection mold is cooled, the combined injection mold is opened by the mold opening and closing mechanism, and during the mold opening process, the mold opening and closing mechanism drives the demoulding mechanism to eject the obtained one-piece formed PP milk bottle embryo from the combined injection mold and make it fall on the feeding mechanism, and the feeding mechanism is arranged on the frame, and during the mold opening process of the combined injection mold, the air pump mechanism is driven to convey air into the embryo, so that the air ejects the embryo from the combined injection mold, thereby improving the demoulding effect;

[0034] S5: After the embryo is demoulded and falls on the feeding mechanism, step S2 is executed, and in step S2, the mold opening and closing mechanism also drives the demoulding mechanism to reset, and the combined injection mold drives the feeding mechanism to convey the obtained embryo during the mold closing process;

[0035] S6: cyclically executing steps S2-S5 to perform continuous injection molding production of one-piece PP milk bottle embryos, and timely feeding raw materials for making PP milk bottles into the injection molding machine 1 according to production needs.

[0036] In this embodiment, the feeding mechanism includes a conveying frame 2 fixed on the frame, and rollers 3 are rotatably connected to both ends of the conveying frame 2, and the two rollers 3 are connected by a conveyor belt 4. A bracket 5 is fixed on the conveying frame 2, and a hanging plate 6 is fixed on the bracket 5. The hanging plate 6 is located above the conveyor belt 4. The opening and closing mold mechanism and the combined injection mold are both arranged on the hanging plate 6, and an air pump mechanism is arranged on the bracket 5.

[0037] In this embodiment, the combined injection mold includes a core mold 28 and two symmetrically arranged half molds 10. The two half molds 10 are matched to cover the lower half of the core mold 28, so that a mold cavity is formed between the two half molds 10 and the core mold 28. A demolding mechanism is provided on the core mold 28, and the opening and closing mold mechanism is transmission connected to the demolding mechanism. The two half molds 10 are respectively transmission connected to the air pump mechanism and one of the rollers 3.

[0038] In this embodiment, the core mold 28 passes through and is fixedly connected to the middle of the hanging plate 6. The upper end of the core mold 28 is integrally and fixedly connected with an injection tube 29. An injection channel 30 is provided through the center of the injection tube 29 and the core mold 28. The upper end of the injection channel 30 is connected to the injection port of the injection molding machine 1, and a control valve 37 is provided at the lower end of the injection channel 30.

[0039] In this embodiment, the bottom surface of the hanging plate 6 is symmetrically provided with guide grooves 17 on both sides of the core mold 28, and a slider 18 is slidably connected in the guide groove 17, and the upper ends of the two half molds 10 are fixedly connected to the two sliders 18 respectively.

[0040] In this embodiment, the mold opening and closing mechanism includes an axis frame 12 fixed on the upper surface of the hanging plate 6, and an axis rod 13 is rotatably connected to the axis frame 12. The axis rod 13 is transmission-connected to a motor fixed on the hanging plate 6. The motor is not drawn in this application. An axis frame 7 corresponding to the two half-molds 10 is fixed to the bottom surface of the hanging plate 6. A screw sleeve 8 passes through the axis frame 7 and is rotationally connected to the axis. The two ends of the axis rod 13 are transmission-connected to the two screw sleeves 8 through a pulley assembly 11 respectively. A screw 9 passes through and is threadedly connected to the screw sleeve 8. The screw 9 is fixedly connected to the outer wall of the corresponding half-mold 10, and the guide groove 17 and the screw 9 are arranged parallel to each other. A rack 19 and a push-pull rod 24 are fixedly connected to the two screws 9 respectively. A ratchet 20 is rotationally connected to the bracket 5. The outer ring of the ratchet 20 is meshed with the rack 19, and the inner ring of the ratchet 20 is transmission-connected to one of the rollers 3 through a pulley assembly 21.

[0041] In this embodiment, the demoulding mechanism includes a lifting plate 16 with an avoidance hole, the injection tube 29 passes through the avoidance hole, the shaft 13 is provided with two sections of external threads with opposite rotation directions, and two screw sleeves 14 are sleeved and threadedly connected on the two sections of the external threads, the lifting plate 16 is connected to the two screw sleeves 14 through two connecting rods 15, and the two ends of the connecting rod 15 are respectively hinged to the lifting plate 16 and the corresponding screw sleeves 14 through a ball joint pair, a cylindrical cavity 34 is provided in the core mold 28, and the bottom surface of the core mold 28 is provided with a cylindrical cavity 34. A connected groove 35 is provided, and a top block 36 is matched in the groove 35, a push rod 33 is provided in the cylindrical cavity 34, and a gap is left between the outer wall of the push rod 33 and the inner wall of the cylindrical cavity 34, the lower end of the push rod 33 is fixedly connected to the push block 36, the upper end of the push rod 33 passes through and is slidably connected to the top wall of the cylindrical cavity 34, and the upper end of the push rod 33 is sleeved with a sleeve 31, the sleeve 31 is fixed to the bottom surface of the lifting plate 16, and the end of the push rod 33 located in the sleeve 31 is connected to the bottom surface of the lifting plate 16 through a spring 32.

[0042] In this embodiment, the air pumping mechanism includes a pump barrel 22 fixed on the bracket 5, a piston plate 23 is slidably connected inside the pump barrel 22, and a push-pull rod 24 is fixedly connected to the piston plate 23, and a one-way valve 1 25 and a one-way valve 2 26 are fixed and connected on the end wall of the pump barrel 22. The one-way valve 2 26 is connected to the columnar cavity 34 through the air pipe 27. The conduction direction of the one-way valve 1 25 points to the pump barrel 22, and the conduction direction of the one-way valve 2 26 points to the columnar cavity 34.

[0043] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in step S3, the injection molding machine 1 conveys the melted raw material from the injection channel 30 into the mold cavity. After the injection molding is completed, the injection molding machine 1 and the control valve 37 are closed.

[0044] In step S4, the motor is started so that the motor drives the shaft 13 to rotate, thereby the shaft 13 drives the two screw sleeves 8 to rotate through the pulley assemblies 11 at both ends, so that the screw sleeves 8 drive the screw 9 and the half mold 10 connected thereto to move through the threaded transmission, so that the two half molds 10 move away from each other, and the half mold 10 is demolded from the embryo, and in this process, the screw 9 drives the rack 19 to move left, so that the rack 19 drives the outer ring of the ratchet 20 to rotate counterclockwise, and at this time, the outer ring of the ratchet 20 cannot drive the inner ring to rotate through the pawl, so that the inner ring cannot drive the roller 3 and the conveyor belt 4 to run through the pulley assembly 21.

[0045] When the shaft 13 rotates, the two screw sleeves 14 are driven away from each other through the two sections of external threads with opposite rotation directions, so that the two screw sleeves 14 drive the lifting plate 16 to move downward through the two connecting rods 15, and then the lifting plate 16 compresses the spring 32. When the half mold 10 is completely separated from the embryo, the lifting plate 16 applies downward pressure to the push rod 33 through the spring 32, so that the push rod 33 separates the embryo from the core mold 28 through the push block 36, thereby realizing automatic demolding while opening the mold, thereby reducing the difficulty of demolding and helping to improve the efficiency of the injection molding process.

[0046] During the mold opening process, another screw 9 uses the push-pull rod 24 to make the piston plate 23 apply a compressive force to the pump barrel 22. Since the conduction direction of the one-way valve 25 points to the pump barrel 22, and the conduction direction of the one-way valve 26 points to the cylindrical cavity 34, the compressive force transports the air in the pump barrel 22 to the cylindrical cavity 34 through the air pipe 27, and then sprays it out from the groove 35 and pushes the embryo body out from the core mold 28, thereby improving the demolding efficiency and effect.

[0047] In step S5, the motor drives the shaft 13 to rotate in the opposite direction, so that the shaft 13 drives the two screw sleeves 8 to rotate in the opposite direction through the pulley assemblies 11 at both ends, so that the screw sleeves 8 drive the screw 9 and the half mold 10 connected thereto to move in the opposite direction through thread transmission, so that the two half molds 10 are close to each other and molded together. In this process, the screw 9 drives the rack 19 to move left, so that the rack 19 drives the outer ring of the ratchet 20 to rotate clockwise. At this time, the outer ring of the ratchet 20 can drive the inner ring to rotate through the pawl, so that the inner ring can drive the roller 3 and the conveyor belt 4 to run through the pulley assembly 21, so that the embryo body falling on the conveyor belt 4 is output, and automatic feeding after demolding is realized, which saves time and labor, reduces labor intensity, and improves the degree of automation.

[0048] As the shaft 13 rotates, the two screw sleeves 14 are driven to approach each other through the two sections of external threads rotating in opposite directions, so that the two screw sleeves 14 drive the lifting plate 16 to move upward through the two connecting rods 15, and then the lifting plate 16 applies an upward pulling force to the push rod 33 through the spring 32, so that the push rod 33 drives the push block 36 to move upward and reset for the next demoulding use.

[0049] During the mold opening process, another screw 9 pushes the piston plate 23 to apply suction force to the pump barrel 22 through the push-pull rod 24. The suction force will draw external air into the pump barrel 22 through the one-way valve 25 so that it can be inflated to separate the embryo from the core mold 28 during the next demolding.

[0050] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0051] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. An injection molding process for an integrally molded PP milk bottle, comprising an injection molding machine (1) arranged on a frame, characterized in that: The steps include: S1: putting the raw materials for making PP milk bottles into the injection molding machine (1), and the injection molding machine (1) heats and pressurizes the raw materials; S2: Clamping the combined injection mold through the mold opening and closing mechanism; The combined injection mold comprises a core mold (28) and two symmetrically arranged half molds (10); a demoulding mechanism is arranged on the core mold (28), and the mold opening and closing mechanism is transmission-connected to the demoulding mechanism; The mold opening and closing mechanism comprises a shaft frame 2 (12) fixed on the upper surface of the hanging plate (6), a shaft rod (13) being rotatably connected to the shaft frame 2 (12), the shaft rod (13) being transmission-connected to a motor fixed on the hanging plate (6), a shaft frame 1 (7) corresponding to the two half-molds (10) being fixed on the bottom surface of the hanging plate (6), a screw sleeve 1 (8) passing through the shaft frame 1 (7) and being rotatably connected to the shaft frame 1 (7), two ends of the shaft rod (13) being transmission-connected to the two screw sleeves 1 (8) respectively through a pulley assembly 1 (11), a screw rod (9) passing through the screw sleeve 1 (8) and being threadedly connected, the screw rod (9) being fixedly connected to the outer side wall of the corresponding half-mold (10), and a guide groove (17) and the screw rod (9) being arranged parallel to each other, and a rack (19) and a push-pull rod (24) being fixedly connected to the two screw rods (9) respectively; S3: After the combined injection mold is closed, the melted raw material is injected into the combined injection mold by the injection molding machine (1), and after the injection molding is completed, the combined injection mold is cooled by the cooling system; S4: After the combined injection mold is cooled, the combined injection mold is opened by the mold opening and closing mechanism, and during the mold opening process, the mold opening and closing mechanism drives the demoulding mechanism to eject the obtained one-piece PP milk bottle blank from the combined injection mold and make it fall on the feeding mechanism, and the feeding mechanism is arranged on the frame, and during the mold opening process of the combined injection mold, the air pump mechanism is driven to convey air into the blank, so that the air ejects the blank from the combined injection mold, thereby improving the demoulding effect; The feeding mechanism comprises a conveying frame (2) fixed on a frame, a bracket (5) is fixed on the conveying frame (2), and a hanging plate (6) is fixed on the bracket (5), the mold opening and closing mechanism and the combined injection mold are both arranged on the hanging plate (6), and an air pump mechanism is arranged on the bracket (5); The core mold (28) passes through and is fixedly connected to the middle of the hanging plate (6); the upper end of the core mold (28) is integrally fixedly connected to an injection tube (29); an injection channel (30) is provided through the center of the injection tube (29) and the core mold (28); the upper end of the injection channel (30) is connected to the injection port of the injection molding machine (1); and the lower end of the injection channel (30) is provided with a control valve (37); The demoulding mechanism comprises a lifting plate (16) with an avoidance hole, the injection tube (29) passes through the avoidance hole, the shaft (13) is provided with two sections of external threads with opposite rotation directions, and two screw sleeves (14) are sleeved and threadedly connected on the two sections of the external threads, the lifting plate (16) is connected to the two screw sleeves (14) through two connecting rods (15), and the two ends of the connecting rods (15) are respectively hinged to the lifting plate (16) and the corresponding screw sleeves (14) through ball joints, and the core mold (28) is provided with a cylindrical cavity (34), and the bottom surface of the core mold (28) is provided with a groove ( 35), and a top block (36) is matchedly arranged in the groove (35), a top rod (33) is arranged in the cylindrical cavity (34), and a gap is left between the outer wall of the top rod (33) and the inner wall of the cylindrical cavity (34), the lower end of the top rod (33) is fixedly connected to the top block (36), the upper end of the top rod (33) penetrates and is slidably connected to the top wall of the cylindrical cavity (34), and the upper end of the top rod (33) is sleeved with a sleeve (31), the sleeve (31) is fixed to the bottom surface of the lifting plate (16), and one end of the top rod (33) located in the sleeve (31) is connected to the bottom surface of the lifting plate (16) through a spring (32); The air pump mechanism comprises a pump barrel (22) fixed on a bracket (5), a piston plate (23) being slidably connected inside the pump barrel (22), and a push-pull rod (24) being fixedly connected to the piston plate (23), a one-way valve (25) and a one-way valve (26) being fixedly connected to the end wall of the pump barrel (22), the one-way valve (26) being connected to the columnar cavity (34) via an air pipe (27), the one-way valve (25) being directed toward the inside of the pump barrel (22), and the one-way valve (26) being directed toward the inside of the columnar cavity (34); S5: After the blank is demolded and falls on the feeding mechanism, step S2 is executed, and in step S2, the mold opening and closing mechanism also drives the demolding mechanism to reset, and the combined injection mold drives the feeding mechanism to convey the blank during the mold closing process; S6: cyclically executing steps S2-S5 to continuously perform injection molding production of one-piece PP milk bottle embryos, and timely feeding raw materials for making PP milk bottles into the injection molding machine (1) according to production needs.

2. The one-piece PP milk bottle injection molding process according to claim 1, characterized in that: Both ends of the conveying frame (2) are rotatably connected to rollers (3), and the two rollers (3) are connected by transmission via a conveyor belt (4). The hanging plate (6) is located above the conveyor belt (4).

3. The one-piece PP milk bottle injection molding process according to claim 2, characterized in that: The two half molds (10) are matched to enclose the lower half of the core mold (28), so that a mold cavity is formed between the two half molds (10) and the core mold (28). The two half molds (10) are respectively connected to the air pump mechanism and one of the rollers (3).

4. The one-piece PP milk bottle injection molding process according to claim 3, characterized in that: The bottom surface of the hanging plate (6) is symmetrically provided with guide grooves (17) on both sides of the core mold (28), and a slider (18) is slidably connected in the guide groove (17), and the upper ends of the two half molds (10) are fixedly connected to the two sliders (18) respectively.

5. The one-piece PP milk bottle injection molding process according to claim 4, characterized in that: A ratchet (20) is rotatably connected to the bracket (5) via a fixed axis, the outer ring of the ratchet (20) is meshingly connected to the rack (19), and the inner ring of the ratchet (20) is transmission-connected to one of the rollers (3) via a second pulley assembly (21).

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