Secondary blow molding device

Abstract

A secondary blow molding device mainly comprises a molding die and a molding heating assembly, and is characterized in that a film to be processed is stretched and molded by secondary stretching, so that the wall thickness of a molded film shell is more uniform. An upper forming die groove and a lower forming die groove which are different in size are adopted for secondary blow molding, during primary forming, the size of the primary forming die groove is small, in the forming process, a thin film close to the edge of the plane is thin, and during secondary reverse stretching, due to the fact that the size of the secondary forming die groove is large, the thickness of the thin film is small. When the forming film shell is stretched for the first time, the edge part with the thin wall thickness moves to the interior of the groove of the secondary forming die, and a new edge part is formed on the forming film shell, so that in the secondary stretching process, the stress of the edge part is dispersed, and the wall thickness of the forming film shell is stressed more uniformly in the blow-molding stretching process; and the wall thickness of the finished product is more uniform.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of food processing packaging equipment. BACKGROUND

[0002] The current market of such equipment is mostly one-time blow molding device, which is not uniform in the force of semi-finished film, so that the edge of the formed film shell is thin, the wall thickness is uneven, and the package object is easy to break after packaging. SUMMARY

[0003] In order to overcome the above problems, the utility model provides a secondary blow molding device, which is characterized by comprising a driving support, a lifting lower arm, a lifting upper arm, a lifting support shaft, a lifting drive arm, a lifting connecting rod arm, a lifting support, a mold guide column, a servo motor, a ball screw, a mold connecting frame, a molding heating group, a heating plate, a vacuum air pipe A, a blowing pipe A, a gas hole A, a primary molding die groove, a molding die, a vacuum air pipe B, a blowing pipe B, a gas hole B and a secondary molding die groove, the servo motor is fixed on the driving support, the servo motor drives the ball screw to rotate, the driving ball screw drives the lifting drive arm to move up and down, the lifting drive arm drives the lifting lower arm to swing through the lifting connecting rod arm, the lifting lower arm drives the lifting upper arm to swing, the lifting upper arm drives the lifting support to move up and down along the mold guide column through the lifting support shaft, the molding die is installed on the lifting support through the mold connecting frame, the molding heating group is provided with the heating plate, the vacuum air pipe A, the blowing pipe A, the gas hole A and the primary molding die groove, the molding die is provided with the gas hole B, the vacuum air pipe B, the blowing pipe B and the secondary molding die groove, and the size of the primary molding die groove is smaller than that of the secondary molding die groove. ADVANTAGEOUS EFFECTS

[0004] Compared with the prior art, the secondary blow molding device can successfully solve the problem of uneven wall thickness of the formed film shell, the secondary blow molding adopts two molding die grooves with different sizes, the primary molding die groove is smaller in size, the film near the plane edge is thinner during the molding process, and the edge part with thinner wall thickness moves to the inside of the secondary molding die groove during the second reverse stretching because the secondary molding die groove is larger in size, so that the formed film shell forms a new edge part, and the stress of the edge part is dispersed during the second stretching process, so that the wall thickness of the formed film shell is more uniform during the blow stretching process. BRIEF DESCRIPTION OF DRAWINGS

[0005] Figure 1 It is a perspective view of the utility model;

[0006] Figure 2 It is Figure 1Sectional view along the A-A direction;

[0007] Figure 3 for Figure 1 Top-view 3D view of the combination of numbers 13 and 19;

[0008] Figure 4 for Figure 1 A stereoscopic view of the combination of numbers 13 and 19 from below;

[0009] In the diagram, 1. Drive support; 2. Lower lifting arm; 3. Upper lifting arm; 4. Lifting support shaft; 5. Lifting drive arm; 6. Lifting linkage arm; 7. Lifting support; 8. Air hole B; 9. Mold guide pillar; 10. Servo motor; 11. Ball screw; 12. Mold connecting frame; 13. Molding heating assembly; 14. Heating plate; 15. Vacuum extraction pipe A; 16. Air blowing pipe A; 17. Air hole A; 18. Primary molding mold groove; 19. Molding mold; 20. Vacuum extraction pipe B; 21. Air blowing pipe B; 22. Secondary molding mold groove. Detailed Implementation

[0010] The secondary blow molding device mainly consists of a molding die 19 and a molding heating assembly 13. Its characteristic is that it utilizes secondary stretching to stretch the film to be processed, resulting in a more uniform wall thickness for the molded film shell. The molding heating assembly 13 mainly consists of a heating plate 14, a vacuum extraction pipe A15, an air blowing pipe A16, air holes A17, and a primary molding die groove 18. The molding die 19 mainly consists of air holes B8, a vacuum extraction pipe B20, an air blowing pipe B21, and a secondary molding die groove 22. By utilizing the different dimensions of the primary molding die groove 18 and the secondary molding die groove 22, the stretching and forming of the finished film shell is completed, resulting in a more uniform wall thickness for the finished product.

[0011] The servo motor 10 is fixed on the driving support 1, the servo motor 10 is started, the servo motor 10 drives the ball screw 11 to rotate and drives the lifting driving arm 5 to move up and down, the lifting driving arm 5 drives the lifting lower arm 2 to swing through the lifting connecting arm 6, the lifting lower arm 2 drives the lifting upper arm 3 to swing, the lifting upper arm 3 drives the lifting support 7 to move up and down along the mold guide column 9 through the lifting support shaft 4, the forming mold 19 is installed on the lifting support 7 through the mold connecting frame 12, the film to be processed is between the forming heating group 13 and the forming mold 19, when the lifting support 7 runs upward, the forming mold 19 is lifted, when the forming mold 19 clamps the film to be processed between the forming heating group 13, the heating plate 14 on the forming heating group 13 heats the film, at the same time, the vacuum air exhaust pipe 15 on the forming heating group 13 starts to exhaust air, the air in the primary forming mold groove 18 is discharged from the mold through the air hole A 17, at the same time of discharging air, the air blowing pipe B 21 on the forming mold 19 starts to blow air, the air is blown out through the air hole B 8 on the secondary forming mold groove 22 on the forming mold 19, so that the film is stretched upward, when the stretched film fills the primary forming spherical film 18, the primary stretching is completed, at the same time, the vacuum air exhaust pipe A 15 and the air blowing pipe B 21 are closed, at this time, the air blowing pipe A 16 is opened to blow air from the air hole A 17 in the primary forming mold groove 18, at the same time, the vacuum air exhaust pipe B 20 on the secondary forming mold groove 22 starts to exhaust air, the film to be processed is processed by secondary stretching, when the film fills the secondary forming mold groove 22, the processing is completed, the air blowing pipe A 16 and the vacuum air exhaust pipe B 20 are closed at the same time, the servo motor 10 is reversed to rotate, the forming mold 19 is lowered, the secondary blow molding is completed, and the next cycle is carried out.

Claims

1. A secondary blow molding apparatus characterized by comprising: The structure comprises a driving support, a lifting lower arm, a lifting upper arm, a lifting support shaft, a lifting driving arm, a lifting connecting rod arm, a lifting support, a mold guide column, a servo motor, a ball screw, a mold connecting frame, a forming heating assembly, a heating plate, a vacuum air pipe A, a blowing pipe A, a gas hole A, a primary forming mold groove, a forming mold, a vacuum air pipe B, a blowing pipe B, a gas hole B, a secondary forming mold groove, the servo motor is fixed on the driving support, the servo motor drives the ball screw to rotate, the driving ball screw drives the lifting driving arm to move up and down, the lifting driving arm drives the lifting lower arm to swing through the lifting connecting rod arm, the lifting lower arm drives the lifting upper arm to swing, the lifting upper arm drives the lifting support to move up and down along the mold guide column through the lifting support shaft, the forming mold is installed on the lifting support through the mold connecting frame, the forming heating assembly is provided with the heating plate, the vacuum air pipe A, the blowing pipe A, the gas hole A and the primary forming mold groove, the forming mold is provided with the gas hole B, the vacuum air pipe B, the blowing pipe B and the secondary forming mold groove, and the size of the primary forming mold groove is smaller than that of the secondary forming mold groove.

Images