One-outlet eight-cavity gradual change bottle preform injection molding equipment

Abstract

The invention relates to the technical field of bottle preform production, in particular to one-outlet eight-cavity gradually-changing bottle preform injection molding equipment which comprises a support, a conveying pipe and a machine shell are arranged on the support, two hoppers are arranged above the conveying pipe, electric control valves are installed at the bottom ends of the two hoppers, one end of a feeding port of the conveying pipe is connected with a mixer, and the other end of the conveying pipe is connected with a discharging port of the machine shell. The bottom ends of the two hoppers are connected with the top end of the mixer through a Y-shaped pipe, a spiral conveying rod driven by a motor is arranged in the conveying pipe, and a heater is installed on the conveying pipe. Through the arrangement of the first mold plate, the cavity material distribution channel, the mold cavity, the second mold plate, the mold core and other structures, the equipment can perform injection molding on eight sets of bottle blanks at a time, the production efficiency of the bottle blanks is effectively improved, and through the arrangement of the hopper, the electric control valve, the mixer, the Y-shaped pipe and other structures, the production efficiency is improved. Two different colors of raw materials can be used for producing bottle preforms with gradient colors, the single-color appearance of traditional bottle preforms is changed, and the attractiveness of the bottle preforms is improved.

Description

Technical Field

[0001] The invention relates to the technical field of bottle embryo production, and in particular to a one-outlet eight-cavity gradient bottle embryo injection molding device. Background Art

[0002] A bottle embryo is a semi-finished product formed by injection molding, which is mainly used in the production of plastic bottles. During the production process, the plastic raw materials are filled into the mold under a specific temperature and pressure, and formed into a specific shape through injection molding. Subsequently, the bottle embryo is blow molded to become the common plastic bottle in our daily life.

[0003] Existing preform injection molding equipment is usually a single-cavity structure, and can usually only mold one group of preforms in each processing process, resulting in low preform production efficiency. In addition, the existing preform injection molding equipment only has a single feed hopper and cannot use raw materials of different colors to produce gradient color preforms, resulting in the production of single color preforms and poor aesthetics. Summary of the invention

[0004] The present invention provides an eight-cavity gradient preform injection molding device, which solves the technical problem in the prior art that usually only one group of preforms can be molded in each processing process, resulting in low production efficiency of preforms and inability to use raw materials of different colors to produce gradient color preforms, resulting in the produced preforms having a single color and poor aesthetics.

[0005] In view of the above problems, the technical solution proposed by the present invention is:

[0006] A one-outlet eight-cavity gradient preform injection molding device comprises a support, on which a feed pipe and a casing are arranged, two groups of hoppers are arranged above the feed pipe, the bottom ends of the two groups of hoppers are both equipped with electric control valves, one end of the feed inlet of the feed pipe is connected to a group of mixers, the bottom ends of the two groups of hoppers are connected to the top of the mixer through Y-shaped tubes, a motor-driven spiral conveying rod is arranged inside the feed pipe, a heater is installed on the feed pipe, a first template is arranged inside the casing, one end of the feed outlet of the feed pipe extends into the cavity inside the first template, eight groups of material distribution channels are scattered outward around the cavity, eight groups of mold cavities distributed in an annular shape are arranged on one side of the first template, the ends of the eight groups of material distribution channels are respectively connected to the eight groups of mold cavities, a second template is also arranged inside the feed pipe, and eight groups of mold cores distributed in an annular shape are arranged on one side of the second template.

[0007] Furthermore, the driving assembly includes a cylinder disposed on one side of the housing and a push rod connected between the cylinder and the second template.

[0008] Furthermore, four groups of sliding rods are arranged inside the housing around the second template, and sliding sleeves are slidably fitted on the surfaces of the four groups of sliding rods respectively, and the four groups of sliding sleeves are fixedly connected to the second template.

[0009] Furthermore, a cooling cavity is provided inside the first template, and the cooling cavity covers the eight groups of mold cavities therein. A chiller is provided at the bottom end of the support, and the water outlet of the chiller is connected to the bottom of the cooling cavity through a water inlet pipe, and the water inlet of the chiller is connected to the top of the cooling cavity through a return pipe.

[0010] Furthermore, a top ring is slidably mounted on the eight groups of mold cores, a push plate is provided on one side of the second mold plate, the push plate and the top ring are connected by a connecting rod, and a spring is also provided between the push plate and the second mold plate.

[0011] Furthermore, a discharge port is provided at the bottom of the casing, and a discharge chute is provided at the bottom end of the support below the discharge port.

[0012] Furthermore, a stop door is slidably provided on one side of the housing, and a glass window is installed on the stop door.

[0013] Furthermore, a transparent observation slot is provided on the hopper, and scale lines are distributed on the surface of the transparent observation slot.

[0014] Furthermore, a cover plate is hinged on the top of the hopper via a hinge.

[0015] Furthermore, a one-out eight-cavity gradient preform injection molding process is applied to the one-out eight-cavity gradient preform injection molding equipment, comprising the following steps:

[0016] S1: The air cylinder is started to drive the push rod to move forward, so that the second template moves horizontally toward the first template under the pushing action of the push rod, until the second template and the first template are closed to each other and the eight groups of mold cores extend into the interior of the eight groups of mold cavities.

[0017] S2: starting the motor of the feed pipe so that the motor drives the spiral conveying rod inside the feed pipe to rotate, and starting the heater on the feed pipe to heat the inside of the feed pipe.

[0018] S3: Add raw materials of two different colors into two groups of hoppers, and control the electric control valve at the bottom of the first group of hoppers to open, so that the raw materials of the first color will enter the interior of the feed pipe through the Y-tube and the mixer, gradually control the electric control valve at the bottom of the first group of hoppers to close, and gradually control the electric control valve at the bottom of the second group of hoppers to open.

[0019] S4: After all the raw materials are injected into the gap between the mold core and the mold cavity and formed, the chiller is started so that the cold water inside the chiller is filled into the cooling cavity inside the first template and circulated to cool the molded preform between the mold core and the mold cavity.

[0020] S5: After the preform is cooled, the cylinder is started to drive the push rod to move backward, so that the second template moves horizontally in the direction away from the first template under the pushing action of the push rod until the second template is separated from the first template. At this time, the preform formed on the mold core will be automatically pushed down by the top ring and fall into the discharge chute. The staff will place the collection box on the outlet side of the discharge chute to collect the finished preforms.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: through the arrangement of the first template, the cavity material distribution channel, the mold cavity, the second template, the mold core and other structures, the equipment can injection mold eight groups of bottle preforms at a time, effectively improving the production efficiency of the bottle preforms, and through the arrangement of the hopper, the electric control valve, the mixer, the Y-tube and other structures, two different colors of raw materials can be used to produce gradient color bottle preforms, which changes the single color appearance of traditional bottle preforms and improves the aesthetics of the bottle preforms. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a front view structural schematic diagram of the present invention;

[0025] Figure 3 It is a schematic diagram of the internal structure of the casing in the present invention;

[0026] Figure 4 It is a schematic diagram of the internal structure of the material conveying pipe in the present invention;

[0027] Figure 5 It is a schematic diagram of the structure of the push plate and the second template in the present invention;

[0028] Figure 6 It is a schematic diagram of the structure of the top ring and the connecting rod in the present invention;

[0029] Figure 7 It is a schematic diagram of the structure of the cooling chamber and the chiller in the present invention;

[0030] Figure 8 It is a schematic diagram of the cutaway structure of the material distribution channel in the present invention.

[0031] In the figure: 1. support; 2. feed pipe; 3. casing; 4. hopper; 5. electric control valve; 6. mixer; 7. Y-type tube; 8. heater; 9. first template; 10. cavity; 11. material distribution channel; 12. mold cavity; 13. second template; 14. mold core; 15. cylinder; 16. push rod; 17. slide rod; 18. sleeve; 19. cooling chamber; 20. chiller; 21. water inlet pipe; 22. water return pipe; 23. push plate; 24. connecting rod; 25. spring; 26. stop door; 27. glass window; 28. feed port; 29. ​​discharge chute; 30. transparent observation slot; 31. scale line; 32. cover plate; 33. top ring. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1-8A one-outlet eight-cavity gradient preform injection molding device comprises a support 1, a feed pipe 2 and a housing 3 are arranged on the support 1, two groups of hoppers 4 are arranged above the feed pipe 2, the insides of the two groups of hoppers 4 are respectively used to store two injection molding raw materials of different colors, the raw materials can flow out through the discharge port at the bottom of the hopper 4, the bottom ends of the two groups of hoppers 4 are both installed with electric control valves 5, the outflow speed of the raw materials inside the hopper 4 can be controlled by the electric control valve 5, one end of the feed inlet of the feed pipe 2 is connected to a group of mixers 6, the bottom ends of the two groups of hoppers 4 are connected to the top of the mixer 6 through Y-shaped tubes 7, and the raw materials are discharged from the two groups of hoppers 4 to the top of the mixer 6. The raw materials flowing out from the bottom will be collected into the mixer 6 through the Y-shaped tube 7. After the two raw materials are mixed in the mixer 6, they enter the feeding pipe 2. The feeding pipe 2 is provided with a spiral conveying rod driven by a motor. When the spiral conveying rod rotates, it can drive the feeding pipe 2 to move forward. A heater 8 is installed on the feeding pipe 2. The heater 8 is provided with a plurality of heating blocks covering the surface of the feeding pipe 2. When the raw materials are moved forward in the feeding pipe 2, they are gradually melted by the heating effect of the heater 8. The melted raw materials will be further mixed evenly under the rotation and stirring effect of the spiral conveying rod. The shell 3 is provided with a first template 9 inside, and one end of the discharge port of the feed pipe 2 extends into the cavity 10 inside the first template 9. Eight groups of feed channels 11 are scattered outward around the cavity 10. One side of the first template 9 is provided with eight groups of mold cavities 12 distributed in an annular manner. The ends of the eight groups of feed channels 11 are respectively connected to the eight groups of mold cavities 12. The raw materials inside the feed pipe 2 will be transported from the discharge port of the feed pipe 2 to the cavity 10 in the first template 9. The raw materials in the first template 9 can be divided into eight strands through the diversion effect of the eight groups of feed channels 11 and flow into the eight groups of mold cavities 12 respectively. A second template 13 is also provided inside the tube 2, and eight groups of mold cores 14 distributed in a ring are provided on one side of the second template 13. The positions of the mold cores 14 are aligned with the positions of the mold cavities 12. A driving component is provided between the housing 3 and the second template 13, and the second template 13 can be driven by the driving component to move horizontally toward or away from the first template 9. When the second template 13 approaches the first template 9, the eight groups of mold cores 14 will extend into the interior of the eight groups of mold cavities 12, and the injection molding material injected into the mold cavities 12 will fill the gap between the mold cores 14 and the mold cavities 12 to form the shape of the bottle embryo.

[0035] When in use, the second template 13 is driven by the driving component to move horizontally toward the direction close to the first template 9 so that the two are closed. At this time, the eight groups of mold cores 14 will extend into the interior of the eight groups of mold cavities 12, and the two different colors of raw materials are added to the two groups of hoppers 4, and the electric control valve 5 at the bottom of the first group of hoppers 4 is controlled to open. The raw material of the first color will enter the interior of the feed pipe 2 through the Y-tube 7 and the mixer 6, and the raw material is pushed forward in the feed pipe 2 and heated to a melted state. In this process, the electric control valve 5 at the bottom of the first group of hoppers 4 is gradually controlled to be closed, and the electric control valve 5 at the bottom of the second group of hoppers 4 is gradually controlled to be opened. The raw material of the second color will enter the mixer 6 through the Y-tube 7. The two colors of raw materials are mixed in the mixer 6 and enter the interior of the feed pipe 2, and are pushed forward in the feed pipe 2 and heated to a melted state. Since the first color of raw material entering the feed pipe 2 gradually decreases and the second color of raw material gradually increases, the raw material inside the feed pipe 2 will produce two color gradients. When the first When the electric control valve 5 at the bottom of the first hopper 4 is completely closed and the electric control valve 5 at the bottom of the second hopper 4 is completely opened, the raw material entering the feeding pipe 2 will gradually change into the second color, and the raw material in the feeding pipe 2 will be transported to the cavity 10 inside the first template 9. The raw material in the first template 9 can be divided into eight strands through the diversion effect of the eight groups of material channels 11 and flow into the eight groups of mold cavities 12 respectively. The injection molding raw material injected into the mold cavity 12 will fill the gap between the mold core 14 and the mold cavity 12 to form the shape of the bottle embryo. Since the raw material delivered to the delivery pipe 2 gradually changes from the first color to the second color, after the bottle blank filled in the gap between the mold core 14 and the mold cavity 12 is cooled and formed, its front end and rear end are composed of raw materials of two gradually changing colors. At this time, the second template 13 is driven by the driving component to move horizontally in a direction away from the first template 9 to separate the two. At this time, the mold core 14 will move out of the mold cavity 12 and the formed bottle blank will be sleeved on the surface of the mold core 14. Finally, the bottle blank can be separated from the mold core 14.

[0036] For further information, see Figure 1-8The driving assembly includes a cylinder 15 arranged on one side of the casing 3 and a push rod 16 connected between the cylinder 15 and the second template 13. When the cylinder 15 drives the push rod 16 to move forward and backward, the second template 13 will move forward and backward in the direction close to or away from the first template 9 driven by the push rod 16. In addition, four groups of sliding rods 17 are arranged around the second template 13 inside the casing 3. The surfaces of the four groups of sliding rods 17 are respectively slidably fitted with sliding sleeves 18. The four groups of sliding sleeves 18 are fixedly connected to the second template 13. When the second template 13 moves, the four groups of sliding rods 17 will slide horizontally along the surface of the sliding sleeves 18. The sliding rods 17 and the sliding sleeves 18 can guide the second template 13 and support it during the movement of the second template 13, thereby avoiding the downward bending force on the push rod 16 and ensuring the service life of the cylinder 15 and the push rod 16.

[0037] For further information, see Figure 1-8 A cooling cavity 19 is provided inside the first template 9, and the cooling cavity 19 covers the eight groups of mold cavities 12 therein. A chiller 20 is provided at the bottom end of the support 1. The water outlet of the chiller 20 is connected to the bottom of the cooling cavity 19 through a water inlet pipe 21, and the water inlet of the chiller 20 is connected to the top of the cooling cavity 19 through a return pipe 22. A water pump is provided inside the chiller 20, and the water pump pumps cold water into the bottom end of the cooling cavity 19 through the water inlet pipe 21. When the cold water inside the cooling cavity 19 is full, the water at the top of the cooling cavity 19 will overflow through the return pipe 22 and flow back into the chiller 20. The refluxed water is cooled by the condenser inside the chiller 20 and then flows into the cooling cavity 19 again. When the melted raw material is injected into the mold cavity 12, the circulating cold water can quickly cool the mold cavity 12 covered in the cooling cavity 19, thereby accelerating the cooling speed of the raw material injected into the mold cavity 12 and improving the molding efficiency of the bottle embryo.

[0038] For further information, see Figure 1-8, a top ring 33 is slidably fitted on the eight groups of mold cores 14, a push plate 23 is provided on one side of the second template 13, the push plate 23 and the top ring 33 are connected by a connecting rod 24, a spring 25 is further provided between the push plate 23 and the second template 13, and the push rod 16 passes through the through hole in the middle of the push plate 23 and is connected to the second template 13. After the preform is formed, the second template 13 is driven by the driving component to move in a direction away from the first template 9. At this time, the mold core 14 moves out of the outer side of the mold cavity 12 and the formed preform is nested on the surface of the mold core 14. When the push plate 23 on one side of the second template 13 hits the inner wall of the casing 3 during the movement, the spring 25 will be compressed, and the push plate 23 will move in a direction close to the second template 13. The top ring 33 will synchronously slide forward on the surface of the mold core 14 under the driving action of the connecting rod 24, and the preform formed on the mold core 14 will be pushed down by the top ring 33, so that the formed preform can be automatically demolded.

[0039] For further information, see Figure 1-8 A discharge port 28 is provided at the bottom of the housing 3, and a discharge chute 29 is provided at the bottom end of the support 1 below the discharge port 28. The finished bottle preforms falling from the mold core 14 after demolding will fall into the discharge chute 29 through the discharge port 28, and the bottle preforms will slide out from the discharge chute 29 to the outside. The staff only needs to place the collection box on the outlet side of the discharge chute 29 to conveniently collect the finished bottle preforms.

[0040] For further information, see Figure 1-8 A baffle door 26 is slidably provided on one side of the casing 3, and a glass window 27 is installed on the baffle door 26. The casing 3 can be controlled to be opened or closed by pulling the baffle door 26. During the injection molding process, closing the baffle door 26 can seal the casing 3 to prevent people around from touching the parts inside the casing 3 and getting hurt. When the baffle door 26 is closed, the process of the injection molding process can be viewed through the glass window 27. After the processing is completed, the casing 3 can be opened by opening the baffle door 26, which is convenient for users to take out materials or perform maintenance.

[0041] For further information, see Figure 1-8 A transparent observation slot 30 is provided on the hopper 4, and scale lines 31 are distributed on the surface of the transparent observation slot 30. Through the transparent observation slot 30 and the scale lines 31, the staff can intuitively see the remaining amount of raw materials inside the hopper 4, which is convenient for controlling the production process.

[0042] For further information, see Figure 1-8 The top of the hopper 4 is hinged with a cover plate 32. After adding raw materials into the hopper 4, the top of the hopper 4 can be sealed by the cover plate 32 to prevent foreign matter from falling into the raw materials in the hopper 4 and affecting the quality of the finished bottle embryos.

[0043] For further information, see Figure 1-8 A one-out eight-cavity gradient preform injection molding process, applied to the one-out eight-cavity gradient preform injection molding equipment, comprises the following steps:

[0044] Step 1: Start the cylinder 15 to drive the push rod 16 to move forward, so that the second template 13 moves horizontally towards the direction close to the first template 9 under the pushing action of the push rod 16, until the second template 13 and the first template 9 are closed with each other and the eight groups of mold cores 14 extend into the interior of the eight groups of mold cavities 12.

[0045] Step 2: Start the motor of the feed pipe 2 so that the motor drives the spiral conveying rod inside the feed pipe 2 to rotate, and start the heater 8 on the feed pipe 2 to heat the inside of the feed pipe 2.

[0046] Step 3: Add raw materials of two different colors into two groups of hoppers 4, and control the electric control valve 5 at the bottom of the first group of hoppers 4 to open, so that the raw materials of the first color will enter the interior of the feed pipe 2 through the Y-tube 7 and the mixer 6, and gradually control the electric control valve 5 at the bottom of the first group of hoppers 4 to close, and at the same time gradually control the electric control valve 5 at the bottom of the second group of hoppers 4 to open.

[0047] Step 4: After all the raw materials are injected into the gap between the core 14 and the cavity 12 and formed, the chiller 20 is started so that the cold water inside the chiller 20 is filled into the cooling chamber 19 inside the first template 9 and circulated to cool the molded bottle blank between the core 14 and the cavity 12.

[0048] Step 5: After the preform is cooled, the cylinder 15 is started to drive the push rod 16 to move backward, so that the second template 13 moves horizontally in the direction away from the first template 9 under the pushing action of the push rod 16 until the second template 13 and the first template 9 are separated from each other. At this time, the preform formed on the mold core 14 will be automatically pushed down by the top ring 33 and fall into the discharge chute 29. The staff will place the collection box on the outlet side of the discharge chute 29 to collect the finished preforms.

[0049] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An eight-cavity gradient preform injection molding device, comprising a support (1), on which a feed pipe (2) and a housing (3) are arranged, characterized in that: Two groups of hoppers (4) are arranged above the feed pipe (2), and the bottom ends of the two groups of hoppers (4) are both equipped with electric control valves (5). One end of the feed inlet of the feed pipe (2) is connected to a group of mixers (6), and the bottom ends of the two groups of hoppers (4) are connected to the top of the mixers (6) through Y-shaped tubes (7). A motor-driven screw conveying rod is arranged inside the feed pipe (2), a heater (8) is installed on the feed pipe (2), a first template (9) is arranged inside the casing (3), and the feed pipe ( One end of the discharge port of the first template (2) extends into the cavity (10) inside the first template (9), and eight groups of material distribution channels (11) are scattered outward around the cavity (10), and one side of the first template (9) is provided with eight groups of mold cavities (12) distributed in an annular shape, and the ends of the eight groups of material distribution channels (11) are respectively connected to the eight groups of mold cavities (12), and a second template (13) is also provided inside the material delivery pipe (2), and one side of the second template (13) is provided with eight groups of mold cores (14) distributed in an annular shape.

2. The eight-cavity gradient preform injection molding equipment according to claim 1 is characterized in that: The driving assembly comprises a cylinder (15) arranged on one side of the housing (3) and a push rod (16) connected between the cylinder (15) and the second template (13).

3. The eight-cavity gradient preform injection molding equipment according to claim 2, characterized in that: Four groups of sliding rods (17) are arranged inside the casing (3) around the second template (13), and sliding sleeves (18) are slidably fitted on the surfaces of the four groups of sliding rods (17), and the four groups of sliding sleeves (18) are fixedly connected to the second template (13).

4. The eight-cavity gradient preform injection molding equipment according to claim 3 is characterized in that: A cooling cavity (19) is arranged inside the first template (9), and the cooling cavity (19) covers the eight groups of mold cavities (12) therein; a chiller (20) is arranged at the bottom end of the support (1); a water outlet of the chiller (20) is connected to the bottom of the cooling cavity (19) via a water inlet pipe (21), and a water inlet of the chiller (20) is connected to the top of the cooling cavity (19) via a water return pipe (22).

5. The eight-cavity gradient preform injection molding equipment according to claim 4 is characterized in that: A top ring (33) is slidably mounted on the eight groups of mold cores (14), a push plate (23) is provided on one side of the second mold plate (13), the push plate (23) and the top ring (33) are connected via a connecting rod (24), and a spring (25) is also provided between the push plate (23) and the second mold plate (13).

6. The eight-cavity gradient preform injection molding equipment according to claim 5, characterized in that: The bottom of the casing (3) is provided with a discharge port (28), and the bottom end of the support (1) is located below the discharge port (28) and is provided with a discharge chute (29).

7. The eight-cavity gradient preform injection molding equipment according to claim 6, characterized in that: A blocking door (26) is slidably provided on one side of the housing (3), and a glass window (27) is installed on the blocking door (26).

8. The one-out eight-cavity gradient preform injection molding equipment according to claim 7, characterized in that: The hopper (4) is provided with a transparent observation slot (30), and scale lines (31) are distributed on the surface of the transparent observation slot (30).

9. The eight-cavity gradient preform injection molding equipment according to claim 8, characterized in that: The top of the hopper (4) is hingedly connected with a cover plate (32).

10. A one-out eight-cavity gradient preform injection molding process, applied to the one-out eight-cavity gradient preform injection molding equipment according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: The air cylinder (15) is started to drive the push rod (16) to move forward, so that the second mold plate (13) moves horizontally in a direction close to the first mold plate (9) under the pushing action of the push rod (16), until the second mold plate (13) and the first mold plate (9) are closed to each other and the eight sets of mold cores (14) extend into the interior of the eight sets of mold cavities (12). S2: starting the motor of the feed pipe (2) so that the motor drives the spiral conveying rod inside the feed pipe (2) to rotate, and starting the heater (8) on the feed pipe (2) to heat the inside of the feed pipe (2). S3: Add raw materials of two different colors into two groups of hoppers (4), and control the electric control valve (5) at the bottom of the first group of hoppers (4) to open, so that the raw materials of the first color will enter the interior of the feed pipe (2) through the Y-tube (7) and the mixer (6), gradually control the electric control valve (5) at the bottom of the first group of hoppers (4) to close, and gradually control the electric control valve (5) at the bottom of the second group of hoppers (4) to open. S4: After all the raw materials are injected into the gap between the mold core (14) and the mold cavity (12) and formed, the chiller (20) is started so that the cold water inside the chiller (20) is filled into the cooling chamber (19) inside the first mold plate (9) and circulated, thereby cooling the molded bottle blank between the gap between the mold core (14) and the mold cavity (12). S5: After the preform is cooled, the cylinder (15) is started to drive the push rod (16) to move backward, so that the second template (13) moves horizontally in a direction away from the first template (9) under the pushing action of the push rod (16), until the second template (13) and the first template (9) are separated from each other. At this time, the preform formed on the mold core (14) is automatically pushed down by the top ring (33) and falls into the discharge chute (29). The staff places the collection box on the outlet side of the discharge chute (29) to collect the finished preforms.

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