BOPP preform continuous heating type automatic bottle blowing machine
Patent Information
- Application Number
- CN202521996442.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-17
- Publication Date
- 2026-10-16
- Estimated Expiration
- 2035-09-17
AI Technical Summary
不过在使用烘箱对由BOPP材料制成的壁厚较厚的瓶坯进行加热的过程中，由于BOPP材料具有较好的耐热性，所以极易出现以下情况：一、当瓶坯的外表面被加热至指定温度时，瓶坯的内芯尚未得到有效的加热；二、当瓶坯的内芯被加热至指定温度时，瓶坯的表面已经被加热至融化，导致能耗很高，且产品合格率低
[0008] The beneficial effects of this utility model of a continuous heating automatic blow molding machine for BOPP preforms are as follows: 1. The heating oven is evenly divided into multiple sections, with cooling zones formed between each section, ensuring uniform heating of the inner and outer surfaces of the preforms, resulting in high heat utilization, reduced energy consumption, cost savings, and improved production efficiency and product qualification rate; 2. A pushing mechanism and a transferring mechanism are used to deliver the preforms to the stretch blow molding die. Both the pushing mechanism and the transferring mechanism utilize servo motors, lead screws, and slide blocks, ensuring high precision, accurate operation, and reliable coordination; 3. The two sets of transferring slots on the transferring mechanism can simultaneously clamp and load the preforms delivered by the pushing mechanism, and also transport the stretched blow molded bottles in the stretch blow molding die. The structure is simple, and the synchronized operation effectively improves production efficiency.
Smart Images
Figure CN224856357U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to blow molding machines, and in particular to an automatic blow molding machine for continuous heating of BOPP preforms, belonging to the technical field of blow molding machines. Background Technology
[0002] Blow molding machines are used to produce hollow containers made of BOPP (biaxially oriented polypropylene). First, an injection molding machine injects BOPP material into preforms. Then, a heating device heats the preforms, and a stretch blow molding machine stretches and blows the heated preforms into the final shape. Combining the heating device and the stretch blow molding machine on the same machine is called a fully automatic plastic blow molding machine. This machine can be divided into a preform loading mechanism, a preform feeding mechanism, a preform heating and conveying mechanism, a stretch blow molding mechanism, a preform pushing mechanism, a preform transfer mechanism, and a bottle ejection mechanism. In existing blow molding machines, the preform loading mechanism typically uses a robotic arm to feed the preform to the preform holder of the heating and conveying mechanism. The feeding mechanism then transports the preform and preform to the preform heating and conveying mechanism. A servo motor-driven shifting mechanism moves the sprocket along a track at a constant speed into the heating device for heating. After heating, the preform is pushed by the preform pushing mechanism... The preform transfer mechanism pushes the preform into the stretch blow molding die. After the stretch blow molding die forms the bottle, the preform transfer mechanism moves the blown bottle from the stretch blow molding die to the bottle ejection mechanism to remove the bottle, completing the entire process. However, when heating thick-walled preforms made of BOPP material in an oven, the following situations are prone to occur due to the good heat resistance of BOPP material: 1. When the outer surface of the preform is heated to the specified temperature, the inner core of the preform has not been effectively heated; 2. When the inner core of the preform is heated to the specified temperature, the surface of the preform has been melted, resulting in high energy consumption and low product qualification rate. Summary of the Invention
[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a continuous heating automatic blow molding machine for BOPP preforms that provides uniform preform heating, high heat utilization, reduced energy consumption, cost savings, improved production efficiency, and higher product qualification rate.
[0004] The technical solution of this utility model for a continuous heating automatic blow molding machine for BOPP preforms is as follows: It includes a frame, on which a conveyor chain and a drive sprocket are mounted. The drive sprocket is driven to rotate by a power source and meshes with the conveyor chain. A preform holder is mounted on the conveyor chain, and a BOPP preform is placed on the preform holder. Several heating ovens are evenly distributed above the conveyor chain on the frame, forming cooling zones between each oven. A preform pushing mechanism, a preform transfer mechanism, and a blow molding die are mounted on the front side of the frame near the conveyor chain. The preform pushing mechanism includes a preform pushing base, on which a preform pushing fixing plate is mounted. A preform pushing servo motor and a preform pushing slide rail are mounted on the preform pushing fixing plate. The output shaft of the preform pushing servo motor is connected to... The device includes a pusher screw, a pusher slide on a pusher slide rail, a pusher cylinder on the pusher slide, a pusher plate on the front and rear slide rails, a piston rod of the pusher cylinder that engages with the pusher plate, and a bottle preform on a preform holder. The device also includes a transfer base, a transfer cylinder and front and rear transfer rails on the transfer base, a transfer slide on the front and rear transfer rails, a piston rod of the transfer cylinder connected to the transfer slide, a transfer servo motor on the transfer slide, an output shaft of the transfer servo motor connected to the transfer screw, a transfer slider on the transfer screw with a threaded engagement, and a triple-jaw transfer plate on one side of the transfer slider that engages with the bottle preform conveyed by the pusher plate.
[0005] Furthermore, the aforementioned blank-transfer cylinder consists of two cylinders, one on the left and one on the right.
[0006] Furthermore, a transfer groove is provided on the triple claw transfer plate, which cooperates with the bottle preform conveyed by the push plate.
[0007] Furthermore, the billet transfer grooves are in three groups, with four in each group.
[0008] The beneficial effects of this utility model of a continuous heating automatic blow molding machine for BOPP preforms are as follows: 1. The heating oven is evenly divided into multiple sections, with cooling zones formed between each section, ensuring uniform heating of the inner and outer surfaces of the preforms, resulting in high heat utilization, reduced energy consumption, cost savings, and improved production efficiency and product qualification rate; 2. A pushing mechanism and a transferring mechanism are used to deliver the preforms to the stretch blow molding die. Both the pushing mechanism and the transferring mechanism utilize servo motors, lead screws, and slide blocks, ensuring high precision, accurate operation, and reliable coordination; 3. The two sets of transferring slots on the transferring mechanism can simultaneously clamp and load the preforms delivered by the pushing mechanism, and also transport the stretched blow molded bottles in the stretch blow molding die. The structure is simple, and the synchronized operation effectively improves production efficiency. Attached Figure Description
[0009] Figure 1 This is a top view schematic diagram of the BOPP preform continuous heating automatic blow molding machine of this utility model; Figure 2 This is a three-dimensional schematic diagram of the billet pushing mechanism; Figure 3 This is a top view of the billet transfer mechanism; Figure 4 This is a side view of the billet transfer mechanism. Detailed Implementation
[0010] This utility model relates to an automatic blow molding machine for continuous heating of BOPP preforms, such as... Figure 1 — Figure 4 As shown, the system includes a frame 1, on which a conveyor chain 11 and a drive sprocket 12 are mounted. The drive sprocket 12 is driven to rotate and meshes with the conveyor chain 11. A preform holder 13 is mounted on the conveyor chain 11, and a preform made of BOPP material is mounted on the preform holder 13. Several heating ovens 2 are evenly distributed above the conveyor chain 11 on the frame 1, forming a cooling zone 21 between each heating oven 2. A preform pushing mechanism 3, a preform transferring mechanism 4, and a stretch blow molding die 5 are mounted on the front side of the frame 1 near the conveyor chain 11. The preform pushing mechanism 3 includes a preform pushing base 31, a preform pushing fixing plate 32 on the preform pushing base 31, a preform pushing servo motor 33 and a preform pushing slide rail 34 on the preform pushing fixing plate 32, and the output shaft of the preform pushing servo motor 33 is connected to a preform pushing screw 35. A preform pushing slide block 36 is mounted on the preform pushing slide rail 34. The preform pusher slide 36 is provided with front and rear slide rails 37 and a preform pusher cylinder 38. A preform pusher plate 39 is provided on the front and rear slide rails 37. The piston rod of the preform pusher cylinder 38 cooperates with the preform pusher plate 39. The preform pusher plate 39 cooperates with the preform on the preform holder 13. The preform transfer mechanism 4 includes a preform transfer base 41. A preform transfer cylinder 42 and front and rear slide rails 43 are provided on the preform transfer base 41. A preform transfer slide 44 is provided on the front and rear slide rails 43. The piston rod of the preform transfer cylinder 42 is connected to the preform transfer slide 44. A preform transfer servo motor 45 is provided on the preform transfer servo motor 45. The output shaft of the preform transfer servo motor 45 is connected to the preform transfer screw 46. A preform transfer slider 47 is provided on the preform transfer screw 46. The preform transfer slider 47 is threadedly engaged with the preform transfer screw 46. A triple claw preform transfer plate 48 is provided on one side of the preform transfer slider 47. The triple claw preform transfer plate 48 cooperates with the preform conveyed by the preform pusher plate 39.
[0011] Furthermore, there are two blank-transfer cylinders 42, one on the left and one on the right.
[0012] Furthermore, a transfer groove 49 is provided on the triple claw transfer plate 48, which cooperates with the bottle preform conveyed by the push plate 39.
[0013] Furthermore, the billet transfer groove 49 is in three groups, with four in each group.
[0014] This utility model discloses an automatic blow molding machine for continuous heating of BOPP preforms. During operation, a preform loading structure (a prior art technique used to place the preform onto a preform holder) places the BOPP preform onto the preform holder 13. A power source (e.g., an electric motor) drives a transmission sprocket 12 to rotate, which in turn drives a conveyor chain 11. The conveyor chain 11 then moves the preform holder 13 and the preform together to a heating oven 2, where the preform is heated. When the preform holder 13 and the preform reach the cooling zone 21 between the two heating ovens 2, the external temperature of the preform's outer surface is higher than the ambient temperature, allowing the ambient temperature to cool the preform's outer surface to a certain extent. A fan can be installed in the cooling zone 21 to improve the cooling effect on the outer surface temperature of the preform, while the temperature of the inner surface of the preform will not decrease. After the preform holder 13 and the preform enter the next heating oven 2, the heating oven 2 heats the entire preform again. This process is repeated to ensure that the outer and inner walls of the preform are heated evenly. Finally, the conveyor chain 11 drives the preform holder 13 and the preform to the position of the preform pushing mechanism 3. The preform pushing cylinder 38 of the preform pushing mechanism 3 drives the preform pushing plate 39 to move towards the preform side. The front side of the preform pushing plate 39 (with a slot on the front side) is engaged below the preform opening of the preform holder 13. Then, the preform pushing servo motor 33 drives the preform pushing screw 35 to rotate. The preform pushing screw 35 and the preform pushing slide are engaged. The 36-threaded engagement drives the pusher slide 36 to move to the right. The pusher slide 36 drives the pusher plate 39 and the preform (the number of preforms corresponds to the number of a set of transfer slots 49 and the number of cavities in the mold) to move together to the right to align with the transfer slots 49 of the transfer mechanism 4. At this time, the transfer cylinder 42 drives the transfer slide 44 to move along the front and rear transfer rails 43 to the side of the preform. The transfer slide 44 drives the transfer servo motor 45, the transfer screw 46, the transfer slider 47, and the triple claw transfer plate 48 to move forward together, so that the first set of transfer slots 49 on the triple claw transfer plate 48 is engaged below the preform opening. The triple claw transfer plate 48 clamps the preform, and the pusher mechanism 3 drives the pusher plate 39 to reset. Then the transfer servo motor 45... The output shaft of 5 drives the transfer screw 46 to rotate. The transfer screw 46 is threadedly engaged with the transfer slider 47, which drives the transfer slider 47 to move to the right. The transfer slider 47 drives the triple claw transfer plate 48 and the clamped preform to move to the inner cavity of the stretch blow molding die 5. At the same time, the first set of transfer grooves 49 of the triple claw transfer plate 48 drives the preform into the stretch blow molding die position, while the second set of transfer grooves 49 clamps the bottle that has been stretch blow molded in the stretch blow molding die 5 and removes it from the stretch blow molding die to the right, and moves it to the bottle picking structure (the bottle picking structure is existing technology, used to clamp the molded bottle from the transfer groove 49 and place it in the collection box). Finally, the stretch blow molding die 5 closes the mold and stretch blow molds the preform conveyed by the first set of transfer grooves 49.This utility model discloses a continuous heating automatic blow molding machine for BOPP preforms. First, the heating oven is evenly divided into multiple sections, with cooling zones 21 formed between each section. This ensures uniform heating of the inner and outer surfaces of the preforms, resulting in high heat utilization, reduced energy consumption, cost savings, and improved production efficiency and product qualification rate. Second, a pushing mechanism 3 and a transferring mechanism 4 are used to deliver the preforms to the stretch blow molding die 5. Both the pushing mechanism 3 and the transferring mechanism 4 employ servo motors, lead screws, and slide blocks, ensuring high precision, accurate operation, and reliable coordination. Third, the two sets of transferring grooves 49 on the transferring mechanism 4 can simultaneously clamp and load the preforms from the pushing mechanism 3, while also conveying the stretched blow molded bottles in the stretch blow molding die 5. This simple structure and synchronized operation effectively improve production efficiency.
Claims
1. An automatic blow molding machine for continuous heating of BOPP preforms, comprising a frame (1), a conveyor chain (11) and a drive sprocket (12) arranged on the frame (1), the drive sprocket (12) being driven to rotate by a power source, the drive sprocket (12) meshing with the conveyor chain (11), a preform holder (13) arranged on the conveyor chain (11), and a preform made of BOPP material arranged on the preform holder (13), characterized in that: The frame (1) is located above the conveyor chain (11) and has several heating ovens (2) evenly distributed. Cooling zones (21) are formed between each heating oven (2). A billet pushing mechanism (3), a billet transfer mechanism (4), and a stretch blow molding die (5) are set on the front side of the frame (1) on the conveyor chain (11). The billet pushing mechanism (3) includes a billet pushing base (31), a billet pushing fixing plate (32) is set on the billet pushing base (31), a billet pushing servo motor (33) and a billet pushing slide rail (34) are set on the billet pushing fixing plate (32), the output shaft of the billet pushing servo motor (33) is connected to the billet pushing screw (35), a billet pushing slide (36) is set on the billet pushing slide rail (34), a front and rear slide rail (37) and a billet pushing cylinder (38) are set on the billet pushing slide rail (36), a billet pushing plate (39) is set on the front and rear slide rail (37), and a billet pushing cylinder (38) is set on the billet pushing cylinder (38). The piston rod is engaged with the push plate (39), and the push plate (39) is engaged with the preform on the preform holder (13). The preform transfer mechanism (4) includes a preform transfer base (41), a preform transfer cylinder (42) and a front and rear transfer rail (43) are provided on the preform transfer base (41), a preform transfer slide (44) is provided on the front and rear transfer rail (43), the piston rod of the preform transfer cylinder (42) is connected to the preform transfer slide (44), a preform transfer servo motor (45) is provided on the preform transfer slide (44), the output shaft of the preform transfer servo motor (45) is connected to the preform transfer screw (46), a preform transfer slider (47) is provided on the preform transfer screw (46), the preform transfer slider (47) is threadedly engaged with the preform transfer screw (46), a triple claw preform transfer plate (48) is provided on one side of the preform transfer slider (47), and the triple claw preform transfer plate (48) is engaged with the preform conveyed by the push plate (39).
2. The BOPP preform continuous heating automatic blow molding machine as described in claim 1, characterized in that: The aforementioned blank transfer cylinder (42) consists of two cylinders, one on the left and one on the right.
3. The BOPP preform continuous heating automatic blow molding machine as described in claim 1, characterized in that: The triple claw transfer plate (48) has a transfer groove (49) which cooperates with the bottle preform conveyed by the push plate (39).
4. The BOPP preform continuous heating automatic blow molding machine as described in claim 3, characterized in that: The aforementioned transfer groove (49) consists of two groups, with four in each group.