A special injection molding machine for efficient production of two-color preforms

Abstract

The present invention relates to the field of injection molding technology, and specifically to a special injection molding machine for efficient production of two-color preforms, including a mold system, an injection system, a clamping system, and a cooling system. The mold system includes a fixed mold assembly and a movable mold assembly. The fixed mold assembly is provided with an inner layer injection mold core and an outer layer injection mold core. The movable mold assembly has four convex mold columns. The movable mold assembly is also provided with a rotating drive mechanism and a demoulding drive mechanism. The mold system in the present invention is composed of a fixed mold assembly and a movable mold assembly. The inner layer injection molding station, the outer layer injection molding station, the buffer station, and the unloading station are arranged in sequence at the center position of the fixed mold assembly, realizing efficient integration of multiple stations and ensuring accurate injection and molding of different materials. The design of equipping the inner layer injection molding station with an inner layer injection mold core and setting the outer layer injection mold core at the outer layer injection molding station ensures the independent molding of the inner and outer layer materials of the two-color preform, thereby improving the quality and consistency of the finished product.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding, and in particular to a special injection molding machine for efficient production of double-color bottle embryos. Background Art

[0002] Traditional preform production mostly adopts single-layer injection molding process, which has many limitations in material performance and production efficiency, and it is difficult to meet the modern market's demand for high-performance, high-value-added products. The emergence of two-color preforms provides an effective solution for this. Two-color preforms use a co-injection process of two different materials, which can achieve the combination of materials with different functions and characteristics, thus having higher advantages in the mechanical properties, air tightness and appearance of the product. In addition, two-color preforms also perform well in achieving product differentiation and improving product competitiveness, and are favored by more and more companies. However, existing two-color preform production equipment often has deficiencies in production efficiency and operational complexity, and it is difficult to meet the needs of large-scale and high-efficiency production. Therefore, it is particularly important to develop a special injection molding machine for two-color preforms for efficient production.

[0003] Chinese patent announcement number CN104608335B discloses an injection mold for a two-color bottle and a manufacturing process for the two-color bottle, including a primary mold and a secondary mold, the primary mold is used to manufacture the inner layer of the two-color bottle, the hot melt material of the inner layer of the two-color bottle is poured from the primary pouring port, the inner layer hot melt material is poured from the primary pouring channel into the primary bottle embryo mold, and forcedly cooled by the primary mother mold cooling son to form an outer layer bottle embryo, the upper part of the formed outer layer bottle embryo is formed with an external thread end under the action of the thread mold, the outer layer bottle embryo formed in the primary molding mold is placed in the secondary molding mold, the hot melt material of the outer layer of the two-color bottle is poured from the secondary pouring port, the outer layer hot melt material is poured from the secondary pouring channel into the molding mold of the inner layer bottle embryo, and the inner layer bottle embryo is tightly attached to the outer layer bottle embryo.

[0004] After the injection mold completes the injection molding of the outer preform, the outer preform needs to be placed in the secondary molding mold for subsequent secondary injection molding to form the inner preform. This process involves switching different molding molds at different stages of injection molding. Although this design can achieve the production of two-color preforms, it leads to inefficiency and poor consistency in the entire production process. Frequent mold switching not only increases the production cycle, but may also cause production interruptions and waste of time. At the same time, it is also easy to cause process control problems during operation, such as changes in temperature and pressure, which further affects the quality and consistency of the finished product. In addition, the secondary injection molding step increases equipment wear and maintenance costs, making the overall production line operation more complicated. Summary of the invention

[0005] In view of the problems of the prior art, the present invention provides a special injection molding machine for efficient production of two-color bottle preforms, by sequentially arranging an inner layer injection molding station, an outer layer injection molding station, a buffer station and a blanking station on the fixed mold assembly, and arranging four punch columns opposite to the fixed mold assembly on the movable mold assembly, so that the four punch columns can rotate after mold separation to perform different injection molding stages and automatic demolding, thereby solving the problem that mold switching of the existing injection mold will increase the production cycle and affect the fitting of the inner and outer blanks.

[0006] In order to solve the problems of the prior art, the present invention provides a special injection molding machine for efficient production of two-color bottle preforms, including a mold system, an injection system, a mold clamping system and a cooling system. The mold system includes a fixed mold assembly and a movable mold assembly. The fixed mold assembly is sequentially distributed with an inner layer injection molding station, an outer layer injection molding station, a buffer station and a material unloading station in a clockwise direction along the circumference of the center position of the fixed mold assembly. An inner layer injection molding core is arranged at the inner layer injection molding station, and an outer layer injection molding core is arranged at the outer layer injection molding station. The movable mold assembly has four convex mold columns. When the convex mold column is inserted into the inner layer injection mold core, the outer wall of the convex mold column and the inner layer injection mold core are connected. The inner cavity between the inner walls of the mold core is used for injecting the inner layer of the two-color bottle embryo. When the punch column is inserted into the outer injection mold core, an outer cavity for injecting the outer layer of the two-color bottle embryo is formed between the outer wall of the inner layer of the two-color bottle embryo and the inner wall of the outer injection mold core. A rotating drive mechanism and a demolding drive mechanism are also provided in the movable mold assembly. The rotating drive mechanism is used to drive the four punch columns to rotate around the center position of the movable mold assembly. The demolding drive mechanism is used to drive the punch column toward the buffer station to rotate toward the unloading station. The punch column slides toward the inside of the movable mold assembly along the length direction of the punch column for demolding.

[0007] Preferably, there are two inner layer injection mold cores at the inner layer injection molding station, the two inner layer injection mold cores are symmetrically arranged along the axial section of the inner layer cavity when the mold is closed, and the opposite surfaces of the two inner layer injection mold cores have semi-inner layer molding grooves that can form the inner layer cavity when they abut against each other;

[0008] There are two outer layer injection mold cores at the outer layer injection molding station, the two outer layer injection mold cores are symmetrically arranged along the axial section of the outer cavity, and the opposite surfaces of the two outer layer injection mold cores have semi-outer layer molding grooves that can form the outer layer cavity when they abut against each other;

[0009] The inner layer injection molding station and the outer layer injection molding station are both provided with core separation components which can guide the two inner layer injection mold cores and the two outer layer injection mold cores to separate from each other during mold separation. The movable mold component is also provided with a core closing component which is used to guide the two outer layer injection mold cores and the two inner layer injection mold cores to abut against each other after the punch column is inserted into the inner layer injection molding station and the outer layer injection molding station.

[0010] Preferably, the movable mold assembly also includes a movable mold plate and a rotating mold plate rotatably connected to the movable mold plate, the punch column is distributed on the rotating mold plate along the circumference of the rotating mold plate, and the rotation drive mechanism and the demoulding drive mechanism are arranged between the movable mold plate and the rotating mold plate.

[0011] Preferably, the rotary drive mechanism includes a fixed cylinder, a rotating cylinder, a motor and a gear, one end of the fixed cylinder is connected to the movable mold plate, the fixed cylinder is coaxial with the rotating mold plate, the rotating cylinder is coaxially rotatably arranged in the fixed cylinder, one end of the rotating cylinder is coaxially fixedly connected to the rotating mold plate, a connecting cylinder coaxially fixedly connected thereto is arranged in the rotating cylinder, an outer gear ring is arranged at one end of the connecting cylinder facing the movable mold plate, the motor is fixedly arranged in the fixed cylinder, the gear is coaxially fixedly arranged on the output shaft of the motor, and the gear is meshed with the outer gear ring.

[0012] Preferably, a guide groove is provided on the outer circumferential surface of the fixed cylinder, and the guide groove has a semicircular segment and a V-shaped segment connected to both ends of the semicircular segment. The punch column slides through the rotating mold disk, and the demolding drive mechanism includes a guide pin arranged at one end of the punch column, and the guide pin extends along the radial direction of the punch column. The guide pin extends into the guide groove, and when the guide pin slides in the semicircular segment, the other end of the punch column protrudes from the rotating mold disk, when the guide pin moves from one end of the semicircular segment to the intersection of the V-shaped segment, the end of the punch column slides to the inside of the rotating mold disk, and when the guide pin slides from the intersection of the V-shaped segment to the other end of the semicircular segment, the end of the punch column slides out of the rotating mold disk.

[0013] Preferably, a positioning rod is provided at one end of the rotating mold plate facing the movable mold plate, and a positioning plate is provided at one end of the punch column facing the movable mold plate, and the positioning rod slides through the positioning plate.

[0014] Preferably, the split core assembly includes a fixed seat arranged at the inner layer injection molding station and the outer layer injection molding station, a light rod is arranged on the fixed seat, two inner layer injection mold cores and two outer layer injection mold cores are slidably arranged on the light rod, and an elastic split core element sleeved on the light rod is arranged between the two inner layer injection mold cores and the two outer layer injection mold cores.

[0015] Preferably, an elastic buffer assembly is arranged between the fixed cylinder and the movable mold plate, and an inclined groove is arranged at one end of the inner injection mold core and the outer injection mold core facing the movable mold assembly, and the core closing assembly includes an abutment block which slides through the rotating mold plate, and when the abutment block abuts on the inclined groove and slides thereon, the two inner injection mold cores abut against each other, and the two outer injection mold cores abut against each other, and a connecting block is arranged at one end of the abutment block facing the movable mold plate, and a connecting rod is slidably arranged on the connecting block, one end of the connecting rod slides through the rotating mold plate and is provided with a limiting ring, and the other end of the connecting rod is provided with an abutment rod coaxial therewith, and the diameter of the abutment rod is larger than the diameter of the connecting rod, and one end of the abutment rod abuts on the movable mold plate, and an elastic core closing element is sleeved on the connecting rod, and the elastic core closing element is located between the rotating mold plate and the connecting plate.

[0016] Preferably, the elastic buffer assembly includes a connecting column fixedly arranged at one end of the fixed cylinder along the circumferential direction, the connecting column slides through the movable template and is provided with a connecting ring, an elastic buffer element is provided on the connecting column, and the elastic buffer element is located between the fixed cylinder and the movable template.

[0017] Preferably, the mold system further comprises a base plate, and the mold closing system comprises a cylinder, which is arranged at the center of the base plate, and an output shaft of the cylinder passes through the base plate and is connected to the movable mold plate.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The mold system in the present invention is composed of a fixed mold assembly and a movable mold assembly. The center of the fixed mold assembly is sequentially arranged with an inner layer injection molding station, an outer layer injection molding station, a buffer station and a material unloading station, realizing efficient integration of multiple stations and ensuring accurate injection and molding of different materials. The design of equipping the inner layer injection molding station with an inner layer injection mold core and the outer layer injection molding station with an outer layer injection mold core ensures the independent molding of the inner and outer layer materials of the two-color bottle embryo, thereby improving the quality and consistency of the finished product.

[0020] The four convex mold columns configured in the movable mold assembly correspond to each station, effectively forming the inner and outer cavities, so that the inner and outer layers of the two-color bottle blank can be perfectly combined during the molding process. This design greatly improves the flexibility and adaptability of the mold and meets the diverse production needs.

[0021] In addition, the setting of the rotary drive mechanism and demoulding drive mechanism in the movable mold assembly significantly improves the continuity and efficiency of the production process. The rotary drive mechanism enables the punch column to rotate around the center of the movable mold assembly, facilitating efficient material injection and molding, while the demoulding drive mechanism can effectively push the molded two-color preform during unloading, ensuring that the finished product is demoulded quickly and smoothly, reducing downtime. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional diagram of the mold system in a special injection molding machine for efficient production of two-color bottle preforms.

[0023] Figure 2 It is a cross-sectional view of the inner layer injection molding station in a special injection molding machine for efficient production of two-color preforms.

[0024] Figure 3 The present invention is a cross-sectional view of a split core component and a combined core component in a special injection molding machine for efficient production of two-color preforms.

[0025] Figure 4 It is a cross-sectional view of the middle and outer layer injection molding stations of a special injection molding machine for efficient production of two-color preforms.

[0026] Figure 5It is a three-dimensional diagram of the fixed mold component in a special injection molding machine for efficient production of two-color bottle preforms.

[0027] Figure 6 It is a three-dimensional exploded view of the split core components in a special injection molding machine for efficient production of two-color bottle preforms.

[0028] Figure 7 It is a three-dimensional diagram of the movable mold component in a special injection molding machine for efficient production of two-color bottle preforms.

[0029] Figure 8 It is a stereoscopic view of the rotary drive mechanism in a special injection molding machine for efficient production of two-color preforms from the first perspective.

[0030] Fig. 9 It is a stereoscopic view of the rotary drive mechanism in a special injection molding machine for efficient production of two-color preforms from a second perspective.

[0031] Fig.10 It is a three-dimensional exploded view of the rotary drive mechanism in a special injection molding machine for efficient production of two-color preforms.

[0032] The numbers in the figure are: 1, fixed mold assembly; 11, inner injection mold core; 12, outer injection mold core; 13, inclined groove; 2, movable mold assembly; 21, punch column; 211, positioning plate; 22, movable mold plate; 23, rotating mold plate; 231, positioning rod; 3, rotating drive mechanism; 31, fixed cylinder; 311, semicircular segment; 312, V-shaped segment; 32, rotating cylinder; 321, connecting cylinder; 322, outer gear ring; 33, electric Machine; 34, gear; 35, elastic buffer assembly; 351, connecting column; 352, connecting ring; 353, elastic buffer element; 4, demoulding drive mechanism; 511, fixed seat; 512, light rod; 513, elastic core-splitting element; 521, abutment block; 522, connecting block; 523, connecting rod; 5231, abutment rod; 524, limiting ring; 525, elastic core-splitting element; 6, base plate; 7, cylinder. DETAILED DESCRIPTION

[0033] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] like Figure 1 , Figure 5 and Figure 7As shown, the present invention provides a special injection molding machine for two-color preforms for efficient production, including a mold system, an injection system, a mold clamping system and a cooling system. The mold system includes a fixed mold component 1 and a movable mold component 2. The fixed mold component 1 is provided with an inner layer injection molding station, an outer layer injection molding station, a buffer station and a blanking station in a clockwise direction along the circumference of the center position thereof. An inner layer injection molding core 11 is provided at the inner layer injection molding station, and an outer layer injection molding core 12 is provided at the outer layer injection molding station. The movable mold component 2 has four punch columns 21 corresponding to the inner layer injection molding station, the outer layer injection molding station, the buffer station and the blanking station in sequence. When the punch column 21 is inserted into the inner layer injection molding core 11, the punch column 21 is An inner cavity for injecting the inner layer of the two-color bottle embryo is formed between the outer wall and the inner wall of the inner injection mold core 11. When the punch column 21 is inserted into the outer injection mold core 12, an outer cavity for injecting the outer layer of the two-color bottle embryo is formed between the outer wall of the inner layer of the two-color bottle embryo and the inner wall of the outer injection mold core 12. A rotating drive mechanism 3 and a demolding drive mechanism 4 are also provided in the movable mold assembly 2. The rotating drive mechanism 3 is used to drive the four punch columns 21 to rotate around the center position of the movable mold assembly 2. The demolding drive mechanism 4 is used to drive the punch column 21 toward the buffer station to rotate toward the blanking station. The punch column 21 slides toward the inside of the movable mold assembly 2 along the length direction of the punch column 21 for demolding.

[0035] The fixed mold assembly 1 is also provided with two injection nozzles connected with the inner layer cavity and the outer layer cavity, and the two injection nozzles are respectively connected to injection systems providing molten materials of different colors.

[0036] The mold system consists of a fixed mold assembly 1 and a movable mold assembly 2. The inner layer injection molding station, the outer layer injection molding station, the buffer station and the blanking station are arranged in sequence in the central position of the fixed mold assembly 1. The inner layer injection molding station is equipped with an inner layer injection mold core 11 to ensure the accurate injection of the inner layer material; and the outer layer injection molding station is equipped with an outer layer injection mold core 12 for molding the outer layer material. The movable mold assembly 2 is equipped with four punch columns 21, which correspond to the inner layer injection molding station, the outer layer injection molding station, the buffer station and the blanking station one by one. When the punch column 21 is inserted into the inner layer injection mold core 11, an inner layer cavity for injecting the inner layer of the two-color bottle embryo is formed between its outer wall and the inner layer injection mold core 11. At the same time, when the punch column 21 carries the inner half blank of the two-color bottle embryo and is inserted into the outer injection mold core 12, an outer cavity for injecting the outer layer of the two-color bottle embryo is formed between the outer wall of the inner half blank of the two-color bottle embryo and the outer injection mold core 12. In addition, a rotating drive mechanism 3 and a demoulding drive mechanism 4 are also provided in the movable mold assembly 2, wherein the function of the rotating drive mechanism 3 is to drive the four punch columns 21 to rotate around the center position of the movable mold assembly 2, and the demoulding drive mechanism 4 is responsible for driving the punch column 21 facing the buffer station to slide toward the inside of the movable mold assembly 2 along the length direction of the punch column 21 when rotating to the unloading station, so that the molded two-color bottle embryo abuts against the end face of the movable mold assembly 2 facing the fixed mold assembly 1, thereby completing the demoulding process and ensuring the efficiency and continuity of the production process. Through continuous injection molding and demoulding unloading processes, the injection molding machine realizes efficient injection molding production of two-color bottle embryos, greatly improving production efficiency and finished product quality.

[0037] like Figure 5 As shown, there are two inner layer injection mold cores 11 at the inner layer injection molding station. The two inner layer injection mold cores 11 are symmetrically arranged along the axial section of the inner layer cavity. The opposite surfaces of the two inner layer injection mold cores 11 have semi-inner layer molding grooves that can form the inner layer cavity when they abut against each other.

[0038] There are two outer layer injection mold cores 12 at the outer layer injection molding station. The two outer layer injection mold cores 12 are symmetrically arranged along the axial section of the outer cavity. The opposite surfaces of the two outer layer injection mold cores 12 have semi-outer layer molding grooves that can form an outer layer cavity when they abut against each other.

[0039] The inner layer injection molding station and the outer layer injection molding station are both provided with a core separation assembly which can guide the two inner layer injection mold cores 11 and the two outer layer injection mold cores 12 to separate from each other during mold separation. The movable mold assembly 2 is also provided with a core closing assembly which is used to guide the punch column 21 to be inserted into the inner layer injection molding station and the outer layer injection molding station so that the two outer layer injection mold cores 12 and the two inner layer injection mold cores 11 abut against each other.

[0040] Two inner layer injection mold cores 11 are provided at the inner layer injection molding station. The two inner layer injection mold cores 11 are symmetrically arranged along the axial section of the punch column 21 when the mold is closed. Semi-inner layer molding grooves are designed on the opposite surfaces of each other, so that when the mold is closed, they can abut against each other and form a complete inner layer cavity, ensuring the accurate molding of the inner layer material during the injection molding process. Two outer layer injection mold cores 12 are also arranged at the outer layer injection molding station. The arrangement of the two outer layer injection mold cores 12 also follows the principle of symmetry along the axial section of the punch column 21 when the mold is closed. Semi-outer layer molding grooves are also designed on their opposite surfaces, so that a complete outer layer cavity can be formed when they abut against each other, ensuring the perfect injection and molding of the outer layer material. In addition, the inner layer injection molding station and the outer layer injection molding station are equipped with a core separation assembly, which can effectively guide the two inner layer injection mold cores 11 and the two outer layer injection mold cores 12 to separate from each other during mold separation, thereby smoothly completing the switching of the injection molding cycle and facilitating the subsequent demolding of the blank. The movable mold assembly 2 is also equipped with a core closing assembly, which is mainly used to guide the punch column 21 to accurately abut the two outer layer injection mold cores 12 with the two inner layer injection mold cores 11 after being inserted into the inner layer injection molding station and the outer layer injection molding station, thereby ensuring the high efficiency of the injection molding process and the stability of the finished product quality. It effectively improves the production efficiency of the two-color bottle embryo, makes the injection molding process smoother, and makes the inner and outer layer molding of the product more perfect.

[0041] like Figure 2 , Figure 3 and Figure 4 As shown, the movable mold assembly 2 also includes a movable mold plate 22 connected to the mold closing system, and a rotating mold plate 23 rotatably connected to the movable mold plate 22, the punch column 21 is distributed on the rotating mold plate 23 along the circumference of the rotating mold plate 23, and the rotary drive mechanism 3 and the demolding drive mechanism 4 are arranged between the movable mold plate 22 and the rotating mold plate 23.

[0042] The punch column 21 is evenly distributed along the circumference at one end of the rotating mold plate 23 facing the movable mold assembly 2. This layout not only improves the space utilization of the mold, but also enhances the stability and uniformity of the product during molding. The rotary drive mechanism 3 and the demoulding drive mechanism 4 are arranged between the movable mold plate 22 and the rotating mold plate 23. This position selection enables the rotary drive mechanism 3 and the demoulding drive mechanism 4 to transmit power more effectively, thereby achieving precise control of the rotating mold plate 23 and the punch column 21. The rotary drive mechanism 3 is responsible for driving the rotating mold plate 23 to rotate to achieve the switching of the position of the punch column 21, thereby improving production efficiency; and the demoulding drive mechanism 4 controls the punch column 21 to slide smoothly into the rotating mold plate 23 after the injection molding is completed, so as to ensure that the molded bottle blank can be separated from the punch column 21.

[0043] like Figure 4 and Fig.10As shown, the rotary drive mechanism 3 includes a fixed cylinder 31, a rotating cylinder 32, a motor 33 and a gear 34. One end of the fixed cylinder 31 is connected to the movable mold plate 22, the fixed cylinder 31 is coaxial with the rotating mold plate 23, the rotating cylinder 32 is coaxially rotatably arranged in the fixed cylinder 31, one end of the rotating cylinder 32 is coaxially fixedly connected to the rotating mold plate 23, a connecting cylinder 321 coaxially fixedly connected thereto is arranged in the rotating cylinder 32, an outer gear ring 322 is arranged at one end of the connecting cylinder 321 facing the movable mold plate 22, the motor 33 is fixedly arranged in the fixed cylinder 31, the gear 34 is coaxially fixedly arranged on the output shaft of the motor 33, and the gear 34 is meshed with the outer gear ring 322.

[0044] The fixed cylinder 31 is coaxially arranged with the rotating mold plate 23, so that the whole system can maintain good balance when rotating. The rotating cylinder 32 is coaxially arranged inside the fixed cylinder 31, which further enhances the compactness and coordination of the structure. One end of the rotating cylinder 32 is coaxially fixedly connected with the rotating mold plate 23, so as to ensure that the rotating mold plate 23 can realize synchronous rotation with the movement of the rotating cylinder 32. In addition, the inner end of the rotating cylinder 32 is also provided with a connecting cylinder 321 coaxially fixedly connected with it, and this design effectively transmits the rotational power. The end of the connecting cylinder 321 facing the movable mold plate 22 is provided with an outer gear ring 322 to enhance the meshing effect with the gear 34. The motor 33 is installed in the fixed cylinder 31 to ensure its stability and reliability. On the output shaft of the motor 33, the gear 34 is coaxially fixed and tightly meshed with the outer gear ring 322. Such a structural design enables the power of the motor 33 to be effectively transmitted to the rotating cylinder 32, and the precise rotation control of the rotating mold plate 23 is realized through the cooperation between the gear 34 and the outer gear ring 322. The overall design of the rotary drive mechanism 3 not only improves the operating efficiency of the injection molding machine, but also ensures the coordinated work between the various components, thereby achieving an efficient and stable injection molding production process.

[0045] like Figure 8 and Fig. 9 As shown, a guide groove is provided on the outer circumferential surface of the fixed cylinder 31, and the guide groove has a semicircular segment 311 and a V-shaped segment 312 connected to the two ends of the semicircular segment 311. The punch column 21 slides through the rotating mold plate 23. The demolding drive mechanism 4 includes a guide pin arranged at one end of the punch column 21, and the guide pin extends along the radial direction of the punch column 21. The guide pin extends into the guide groove. When the guide pin slides in the semicircular segment 311, the other end of the punch column 21 protrudes from the rotating mold plate 23. When the guide pin moves from one end of the semicircular segment 311 to the intersection of the V-shaped segment 312, the end of the punch column 21 slides to the inside of the rotating mold plate 23. When the guide pin slides from the intersection of the V-shaped segment 312 to the other end of the semicircular segment 311, the end of the punch column 21 slides out from the rotating mold plate 23.

[0046] The punch column 21 can slide through the rotating mold plate 23 to ensure the accuracy of its position during the entire injection molding process. The demoulding drive mechanism 4 is provided with a guide pin at the inner end of the punch column 21, which extends along the radial direction of the punch column 21 and cooperates with the guide groove. During the sliding process, when the guide pin moves in the semicircular segment 311, the outer end of the punch column 21 will protrude from the rotating mold plate 23, ensuring correct positioning and docking during mold closing. When the guide pin moves smoothly from one end of the semicircular segment 311 to the intersection of the V-shaped segment 312, the outer end of the punch column 21 slides to the inside of the rotating mold plate 23. This process ensures that the molded bottle embryo can be separated from the punch column 21. Then, as the guide pin continues to slide from the intersection of the V-shaped segment 312 to the other end of the semicircular segment 311, the outer end of the punch column 21 will smoothly and automatically slide out from the inside of the mold plate, presenting an injection molding preparation state.

[0047] like Figure 2 As shown, a positioning rod 231 is provided at one end of the rotating mold plate 23 facing the movable mold plate 22 , and a positioning plate 211 is provided at one end of the punch column 21 facing the movable mold plate 22 . The positioning rod 231 slides through the positioning plate 211 .

[0048] In order to ensure that the punch column 21 cannot rotate and keep the guide pin in the guide groove at all times, a positioning rod 231 is provided at one end of the rotating mold plate 23 facing the movable mold plate 22. The function of the positioning rod 231 is to provide necessary positioning support for the punch column 21 to prevent it from accidentally rotating during operation. At the same time, the end of the punch column 21 facing the movable mold plate 22 is equipped with a positioning plate 211 that cooperates with the positioning rod 231. The function of the positioning plate 211 is to further limit the rotational freedom of the punch column 21 to ensure that it remains stable during the entire movement process. This design allows the positioning rod 231 to slide through the positioning plate 211 through a precise matching relationship, forming an efficient locking mechanism to avoid unnecessary displacement of the punch column 21 due to external force or vibration. The combination of the positioning rod 231 and the positioning plate 211 not only improves the overall stability of the system, but also ensures that the guide pin can always remain in the guide groove, thereby ensuring the precise docking of the mold and the smoothness of operation.

[0049] like Figure 5 and Figure 6 As shown, the split core assembly includes a fixed seat 511 arranged at the inner layer injection molding station and the outer layer injection molding station, a light rod 512 is arranged on the fixed seat 511, two inner layer injection mold cores 11 and two outer layer injection mold cores 12 are slidably arranged on the light rod 512, and an elastic split core element 513 is also arranged on the light rod 512, and the elastic split core element 513 is located between the two inner layer injection mold cores 11 and the two outer layer injection mold cores 12.

[0050] The fixed seat 511 is provided with a light rod 512. The design of the light rod 512 allows the two inner injection mold cores 11 and the two outer injection mold cores 12 to slide thereon, thereby achieving a precise docking and demoulding process. In order to improve the flexibility and responsiveness of the system, an elastic split core element 513 is also provided on the light rod 512. The elastic split core element 513 is located between the two inner injection mold cores 11 and the two outer injection mold cores 12. Its function is to provide appropriate elastic force to ensure that the inner injection mold core 11 and the outer injection mold core 12 can move smoothly after injection molding, and at the same time prevent the inner injection mold core 11 and the outer injection mold core 12 from being stuck due to uneven force.

[0051] like Figure 3 and Figure 4 As shown, an elastic buffer component 35 is arranged between the fixed cylinder 31 and the movable mold plate 22, and an inclined groove 13 is arranged on one end of the inner injection mold core 11 and the outer injection mold core 12 facing the movable mold component 2, and the core assembly includes an abutment block 521 that slides through the rotating mold plate 23. When the abutment block 521 abuts on the inclined groove 13 and slides on it, the two inner injection mold cores 11 abut against each other, and the two outer injection mold cores 12 abut against each other, and a connection is arranged on one end of the abutment block 521 facing the movable mold plate 22. Block 522, a connecting rod 523 is slidably provided on the connecting block 522, one end of the connecting rod 523 slides through the rotating mold plate 23 and is provided with a limiting ring 524, the other end of the connecting rod 523 is provided with a coaxial abutment rod 5231, the diameter of the abutment rod 5231 is larger than the diameter of the connecting rod 523, one end of the abutment rod 5231 abuts on the movable mold plate 22, an elastic core element 525 is sleeved on the connecting rod 523, and the elastic core element 525 is located between the rotating mold plate 23 and the connecting plate.

[0052] An elastic buffer assembly 35 is provided between the fixed cylinder 31 and the movable mold plate 22 to effectively absorb the impact and vibration generated during the injection molding process, ensuring the stability of the injection molding and the smoothness of the operation. The inner layer injection mold core 11 and the outer layer injection mold core 12 are both designed with an inclined groove 13 at one end facing the movable mold assembly 2. These inclined grooves 13 provide a contact surface and a sliding path for the two inner layer injection mold cores 11 and the two outer layer injection mold cores 12 to dock with each other, thereby realizing a precise core closing process. When the abutment block 521 slides on the inclined groove 13, the two inner layer injection mold cores 11 and the two outer layer injection mold cores 12 can be tightly abutted, ensuring the tight sealing of the mold and the effective injection of the plastic. A connecting block 522 is provided at one end of the abutment block 521 facing the movable mold plate 22, and a connecting rod 523 is slidably provided on the connecting block 522. One end of the connecting rod 523 slides through the rotating mold plate 23, and a limiting ring 524 is provided to ensure that its range of motion is controlled to prevent excessive displacement. The other end of the connecting rod 523 is provided with a coaxial abutting rod 5231, the diameter of which is larger than that of the connecting rod 523. This design can enhance the stability and strength of the abutment, so that one end of the abutting rod 5231 abuts against the movable mold plate 22. At the same time, an elastic core closing element 525 is sleeved on the connecting rod 523, and the elastic core closing element 525 is arranged between the rotating mold plate 23 and the connecting plate, which can provide the necessary elastic force to adapt to the slight displacement change during the core closing process, and ensure the perfect docking and efficient operation of the two inner injection mold cores 11 and the two outer injection mold cores 12.

[0053] When closing the mold, the movable template 22 overcomes the elastic force of the elastic buffer component 35 and drives the rotating mold plate 23 to abut against the outer sides of the two inner injection mold cores 11 and the two outer injection mold cores 12, so that the punch column 21 is in the injection position. At the same time, the movable template 22 continues to move, so that the abutment rod 5231 drives the connecting block 522 to overcome the elastic force of the elastic core closing element 525, so that the abutment block 521 slides in the inclined groove 13, so that the two inner injection mold cores 11 and the two outer injection mold cores 12 are abutted in turn to form a complete inner cavity and outer cavity.

[0054] After mold separation, the movable mold plate 22 is reset, and the abutment block 521 is reset under the elastic force of the elastic core-closing element 525. The two inner injection mold cores 11 and the two outer injection mold cores 12 are separated under the action of the elastic core-separating element 513, and then the movable mold plate 22 continues to reset until the rotating mold plate 23 drives the punch column 21 to withdraw from the two inner injection mold cores 11 and the two outer injection mold cores 12, thereby effectively avoiding the annular protrusion on the molded bottle embryo from affecting the mold separation effect.

[0055] like Figure 3As shown, the elastic buffer assembly 35 includes a connecting column 351 fixedly arranged at one end of the fixed cylinder 31 along the circumferential direction. The connecting column 351 slides through the movable template 22 and is provided with a connecting ring 352. An elastic buffer element 353 is provided on the connecting column 351, and the elastic buffer element 353 is located between the fixed cylinder 31 and the movable template 22.

[0056] The elastic buffer component 35 is designed to first drive the mold turntable 23 to close the mold when the movable mold plate 22 moves, and then drive the two inner injection mold cores 11 and the two outer injection mold cores 12 to close the core through the core closing component. The connecting column 351 slides through the movable mold plate 22 and is provided with a connecting ring 352 to ensure that the connecting column 351 can move flexibly during operation to maintain the stability and safety of the mold. The connecting column 351 is also provided with an elastic buffer element 353, which is cleverly placed between the fixed cylinder 31 and the movable mold plate 22. Its main function is to provide appropriate elastic force to absorb the impact force caused by factors such as mold opening and closing and injection pressure fluctuations, thereby effectively reducing wear and impact on the equipment.

[0057] like Figure 2 As shown, the mold system also includes a base plate 6 , and the mold closing system includes a cylinder 7 . The cylinder 7 is arranged at the center of the base plate 6 , and the output shaft of the cylinder 7 passes through the base plate 6 and is connected to the movable mold plate 22 .

[0058] The cylinder 7 is arranged at the center of the base plate 6, which ensures the uniformity and efficiency of the mold closing process. The output shaft of the cylinder 7 passes through the base plate 6 through precise engineering design and is tightly connected to the movable plate 22. This connection method not only enhances the transmission efficiency of the mold closing force, but also ensures the smooth movement of the movable plate 22 during the mold closing and opening process.

[0059] The above embodiments only express one or several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A special injection molding machine for efficient production of two-color preforms, comprising a mold system, an injection system, a mold clamping system and a cooling system, wherein the mold system comprises a fixed mold component (1) and a movable mold component (2), characterized in that: The fixed mold component (1) is provided with an inner layer injection molding station, an outer layer injection molding station, a buffer station and a material discharge station in a clockwise direction along the circumference of the center position thereof; the inner layer injection molding station is provided with an inner layer injection mold core (11); the outer layer injection molding station is provided with an outer layer injection mold core (12); the movable mold component (2) has four punch columns (21); when the punch columns (21) are inserted into the inner layer injection mold core (11), an inner layer cavity for injecting the inner layer of the two-color bottle embryo is formed between the outer wall of the punch column (21) and the inner wall of the inner layer injection mold core (11); the punch column (21) is inserted into the outer layer injection mold core (12); 2), an outer layer cavity for injecting the outer layer of the two-color bottle preform is formed between the outer wall of the inner layer of the two-color bottle preform and the inner wall of the outer layer injection mold core (12), and a rotation drive mechanism (3) and a demoulding drive mechanism (4) are also provided in the movable mold assembly (2), the rotation drive mechanism (3) is used to drive the four punch columns (21) to rotate around the center position of the movable mold assembly (2), and the demoulding drive mechanism (4) is used to drive the punch column (21) toward the buffer station to rotate toward the blanking station, and the punch column (21) slides toward the inside of the movable mold assembly (2) along the length direction of the punch column (21) to perform demoulding; The rotary drive mechanism (3) comprises a fixed cylinder (31), a rotating cylinder (32), a motor (33) and a gear (34); a connecting cylinder (321) coaxially fixedly connected thereto is disposed in the rotating cylinder (32); an outer gear ring (322) is disposed at one end of the connecting cylinder (321) facing the movable plate (22); and the gear (34) meshes with the outer gear ring (322); The movable mold assembly (2) further comprises a movable mold plate (22) and a rotating mold plate (23) rotatably connected to the movable mold plate (22); the punch column (21) is distributed on the rotating mold plate (23) along the circumference of the rotating mold plate (23); and the rotation drive mechanism (3) and the demoulding drive mechanism (4) are arranged between the movable mold plate (22) and the rotating mold plate (23); One end of the fixed cylinder (31) is connected to the movable mold plate (22), the fixed cylinder (31) is coaxial with the rotating mold plate (23), the rotating cylinder (32) is coaxially rotatably arranged in the fixed cylinder (31), one end of the rotating cylinder (32) is coaxially fixedly connected to the rotating mold plate (23), the motor (33) is fixedly arranged in the fixed cylinder (31), and the gear (34) is coaxially fixedly arranged on the output shaft of the motor (33); A guide groove is provided on the outer circumferential surface of the fixed cylinder (31), the guide groove having a semicircular segment (311) and a V-shaped segment (312) connected to both ends of the semicircular segment (311), the punch column (21) slides through the rotating die plate (23), the demoulding drive mechanism (4) comprises a guide pin provided at one end of the punch column (21), the guide pin extends in the radial direction of the punch column (21), the guide pin extends into the guide groove, when the guide pin slides in the semicircular segment (311), the other end of the punch column (21) protrudes from the rotating die plate (23), when the guide pin moves from one end of the semicircular segment (311) to the intersection of the V-shaped segment (312), the end of the punch column (21) slides into the interior of the rotating die plate (23), when the guide pin slides from the intersection of the V-shaped segment (312) to the other end of the semicircular segment (311), the end of the punch column (21) slides out from the rotating die plate (23).

2. The high-efficiency production double-color preform injection molding machine according to claim 1, characterized in that: There are two inner layer injection mold cores (11) at the inner layer injection molding station, the two inner layer injection mold cores (11) are symmetrically arranged along the axial section of the inner layer cavity, and the opposing surfaces of the two inner layer injection mold cores (11) have semi-inner layer molding grooves that can form the inner layer cavity when they abut against each other; There are two outer layer injection mold cores (12) at the outer layer injection molding station, the two outer layer injection mold cores (12) are symmetrically arranged along the axial section of the outer cavity, and the opposing surfaces of the two outer layer injection mold cores (12) have semi-outer layer molding grooves that can form an outer layer cavity when they abut against each other; The inner layer injection molding station and the outer layer injection molding station are both provided with a core separation component capable of guiding the two inner layer injection mold cores (11) and the two outer layer injection mold cores (12) to separate from each other during mold separation. The movable mold component (2) is also provided with a core closing component, which is used to guide the two outer layer injection mold cores (12) and the two inner layer injection mold cores (11) to abut against each other after the punch column (21) is inserted into the inner layer injection molding station and the outer layer injection molding station.

3. The special injection molding machine for efficient production of two-color preforms according to claim 2, characterized in that: A positioning rod (231) is provided at one end of the rotating die plate (23) facing the movable die plate (22), a positioning plate (211) is provided at one end of the punch column (21) facing the movable die plate (22), and the positioning rod (231) slides through the positioning plate (211).

4. The special injection molding machine for efficient production of two-color preforms according to claim 3, characterized in that: The split core assembly comprises a fixed seat (511) arranged at the inner layer injection molding station and the outer layer injection molding station, a polished rod (512) is arranged on the fixed seat (511), two inner layer injection mold cores (11) and two outer layer injection mold cores (12) are slidably arranged on the polished rod (512), and an elastic split core element (513) sleeved on the polished rod (512) is arranged between the two inner layer injection mold cores (11) and the two outer layer injection mold cores (12).

5. The special injection molding machine for efficient production of two-color preforms according to claim 4, characterized in that: An elastic buffer component (35) is arranged between the fixed cylinder (31) and the movable mold plate (22); an inner layer injection mold core (11) and an outer layer injection mold core (12) are both provided with an inclined groove (13) at one end facing the movable mold component (2); the core assembly comprises an abutment block (521) that slides through the rotating mold plate (23); when the abutment block (521) abuts against the inclined groove (13) and slides thereon, the two inner layer injection mold cores (11) abut against each other, and the two outer layer injection mold cores (12) abut against each other; and a connection block (521) is provided at one end facing the movable mold plate (22). 22, a connecting rod (523) is slidably provided on the connecting block (522), one end of the connecting rod (523) slides through the rotating mold plate (23) and is provided with a limit ring (524), the other end of the connecting rod (523) is provided with an abutment rod (5231) coaxial therewith, the diameter of the abutment rod (5231) is larger than the diameter of the connecting rod (523), one end of the abutment rod (5231) abuts against the movable mold plate (22), and an elastic core-locking element (525) is sleeved on the connecting rod (523), and the elastic core-locking element (525) is located between the rotating mold plate (23) and the connecting plate.

6. The special injection molding machine for efficient production of two-color preforms according to claim 5, characterized in that: The elastic buffer assembly (35) comprises a connecting column (351) fixedly arranged at one end of the fixed cylinder (31) along the circumferential direction, the connecting column (351) slidingly passes through the movable platen (22) and is provided with a connecting ring (352), an elastic buffer element (353) is provided on the connecting column (351), and the elastic buffer element (353) is located between the fixed cylinder (31) and the movable platen (22).

7. The special injection molding machine for efficient production of two-color preforms according to claim 6, characterized in that: The mold assembly also includes a base plate (6), and the mold clamping system includes a cylinder (7). The cylinder (7) is arranged at the center of the base plate (6), and the output shaft of the cylinder (7) passes through the base plate (6) and is connected to the movable mold plate (22).

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