A positive and negative pressure servo thermoforming machine based on dynamic blending process

Abstract

This utility model relates to the field of vacuum forming machines, specifically a positive and negative pressure servo vacuum forming machine based on dynamic blending technology. It includes a support and a dynamic blending section fixedly mounted on the support. A forming section is fixedly mounted on one side of the support, and a stirring section is rotatably mounted inside the dynamic blending section. The stirring section melts and mixes the raw materials and then conveys them to the forming section for positive and negative pressure forming. In this utility model, food-grade plastic granules are fed into the mixing chamber through the inlet. The mixed molten material is extruded through the extrusion chamber to the forming section. The extruded sheet enters the forming section, and a cylinder pushes the positive and negative pressure forming mold to close, clamping the sheet. High-pressure air is injected into the upper mold to initially extend the sheet, while a vacuum is drawn from the lower mold, causing the sheet to adhere tightly to the mold cavity, forming a precise contour. The synergistic effect of positive and negative pressure ensures uniform forming thickness and clear details, avoiding defects such as bubbles and deformation. The material forms turbulence in the mixing tank, preventing stratification and ensuring uniform dispersion of functional additives.

Description

Technical Field

[0001] This utility model relates to the field of vacuum forming machines, and in particular to a positive and negative pressure servo vacuum forming machine based on dynamic blending process. Background Technology

[0002] Positive and negative pressure servo thermoforming machines play a crucial role in food packaging box production. By adjusting the mixing ratio and physical properties of plastic materials in real time during processing, the materials can achieve optimal performance according to specific needs, contributing to improved product quality and consistency. Combining positive pressure blow molding and negative pressure thermoforming, complex three-dimensional shapes can be formed on the same machine, suitable for manufacturing food packaging boxes of various sizes and shapes. The thermoforming machine provides high-precision position, speed, and pressure control, ensuring uniform thickness and accurate dimensions for each box, meeting stringent food safety standards. Coordinated positive and negative pressure control reduces thickness deviations and avoids localized weaknesses. A precise heating system ensures the material is formed under optimal conditions, preventing quality problems caused by overheating or underheating. Precise material distribution and forming technology minimize waste, reducing raw material costs. Efficient heating and cooling systems and intelligent energy management help reduce electricity consumption, achieving green production. The application of dynamic blending technology and intelligent control systems promotes technological advancement in the packaging industry, laying the foundation for future development. The positive and negative pressure servo thermoforming machine based on dynamic blending technology is one of the essential key equipment in the modern food packaging industry. By integrating advanced technologies and processes, it achieves the production goals of high efficiency, high quality, and low cost, which is of great significance for enhancing the core competitiveness of enterprises.

[0003] When using a blister packaging machine to produce food packaging boxes, there is a problem of insufficient mixing of materials during the extrusion process in traditional blister packaging machines. In view of this, a positive and negative pressure servo blister packaging machine based on dynamic blending process is provided. Utility Model Content

[0004] The main purpose of this invention is to provide a positive and negative pressure servo thermoforming machine based on dynamic blending process, so as to solve the problem of insufficient mixing of materials during the extrusion of traditional thermoforming machines when producing food packaging boxes using thermoforming machines, as mentioned in related technologies.

[0005] To achieve the above objectives, according to one aspect of the present invention, a positive and negative pressure servo thermoforming machine based on dynamic blending process is provided, including a support and a dynamic blending part fixedly installed on the support, a forming part fixedly installed on one side of the support, and further including a stirring part, which is rotatably installed in the dynamic blending part. The stirring part melts and mixes the raw materials and then conveys them to the forming part for positive and negative pressure forming.

[0006] Furthermore, the dynamic blending section includes a mixing shell, which is fixedly mounted on a support. A mixing chamber is provided inside the mixing shell. A driving chamber is provided at one end of the mixing shell, and an extrusion chamber communicating with the mixing chamber is provided at the other end of the mixing shell. An inlet communicating with the mixing chamber is fixedly installed on one side of the mixing shell.

[0007] Furthermore, the mixing chamber has several mixing grooves symmetrically opened on its sidewalls, and a fixed bracket is fixedly installed near the driving chamber in the mixing chamber.

[0008] Furthermore, the stirring part is rotatably installed in the mixing chamber. The stirring part includes a rotating shaft. One end of the rotating shaft passes through the mixing chamber and is located in the driving chamber. The other end of the rotating shaft is rotatably installed in the fixed bracket. Conveying blades are fixedly installed on the side wall of the rotating shaft.

[0009] Furthermore, the stirring section also includes two driven shafts. One end of the driven shaft passes through the mixing chamber and is located in the driving chamber, while the other end of the driven shaft is rotatably mounted in a fixed bracket. Stirring blades are fixedly mounted on the side wall of the driven shaft.

[0010] Furthermore, a motor is fixedly installed inside the drive cavity, and the motor output shaft is fixedly connected to the rotating shaft.

[0011] Furthermore, a drive gear is fixedly installed at one end of the rotating shaft, and a driven gear is fixedly installed at one end of the driven shaft, with the drive gear meshing with the driven gear.

[0012] Furthermore, the molding part includes a mounting frame, which includes several support shafts. Two positive and negative pressure molding molds are slidably installed between the several support shafts. The surface of the mounting frame is provided with a mounting groove, and a cylinder is fixedly installed in the mounting groove. One end of the cylinder piston rod is fixedly installed on one side of the positive and negative pressure molding mold.

[0013] Compared with the prior art, the present invention has the following beneficial effects: In this invention, food-grade plastic granules are fed into the mixing chamber through the inlet. A motor drives a rotating shaft to rotate, which in turn drives conveyor blades to propel the material. Simultaneously, the meshing of the drive gear and driven gear causes the driven shaft to rotate synchronously in opposite directions. The stirring blades perform high-intensity shearing on the material, creating a vortex within the mixing tank, enhancing the distribution and mixing effect and ensuring uniformity. The stirring blades dynamically shear, mix, and heat the raw materials, while the conveyor blades propel the uniformly mixed molten material towards the extrusion chamber. The dual-shaft counter-rotation causes the material to withstand bidirectional shearing forces within the narrow gap, increasing shearing efficiency. The mixing tank enhances the material's... The mixing path within the mixing chamber enhances the uniformity of blending. The mixing grooves on the sidewalls of the mixing chamber form a turbulent structure, forcing the material to be repeatedly divided and recombined during axial transport. The mixed molten material is extruded through the extrusion chamber to the molding section. The extruded sheet enters the molding section, where a cylinder pushes the positive and negative pressure molding molds to close, clamping the sheet. High-pressure air is injected into the upper mold to initially extend the sheet, while the lower mold is vacuumed, causing the sheet to adhere tightly to the mold cavity, forming a precise contour. The synergistic effect of positive and negative pressure ensures uniform molding thickness and clear details, avoiding defects such as bubbles and deformation. The material forms turbulence within the mixing groove, preventing stratification and ensuring uniform dispersion of functional additives. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the vacuum forming machine in a preferred embodiment of the present invention; Figure 2 This is a cross-sectional view of the dynamic blending section in a preferred embodiment of the present invention; Figure 3 This is a cross-sectional view of the mixing shell in a preferred embodiment of the present invention; Figure 4 This is a schematic cross-sectional view of the mixing chamber in a preferred embodiment of the present invention; Figure 5 This is a schematic diagram of the molding part in a preferred embodiment of the present invention.

[0015] Figure label: 1. Support; 2. Dynamic blending section; 21. Mixing shell; 22. Mixing chamber; 23. Drive chamber; 24. Extrusion chamber; 211. Feed inlet; 221. Mixing tank; 222. Fixing bracket; 231. Motor; 3. Stirring section; 31. Rotating shaft; 32. Driven shaft; 311. Conveying blade; 312. Drive gear; 321. Stirring blade; 322. Driven gear; 4. Molding section; 41. Mounting bracket; 42. Support shaft; 43. Positive and negative pressure molding die; 411. Mounting groove; 412. Cylinder. Detailed Implementation

[0016] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0017] This embodiment provides a positive and negative pressure servo thermoforming machine based on dynamic blending process, including a support 1 and a dynamic blending part 2 fixedly installed on the support 1. A forming part 4 is fixedly installed on one side of the support 1. It also includes a stirring part 3, which is rotatably installed in the dynamic blending part 2. The stirring part 3 melts and mixes the raw materials and then conveys them to the forming part 4 for positive and negative pressure forming. like Figure 1 , Figure 2 , Figure 3 As shown, the dynamic blending section 2 includes a mixing shell 21, which is fixedly installed on the support 1. A mixing chamber 22 is provided inside the mixing shell 21. A driving chamber 23 is provided at one end of the mixing shell 21, and an extrusion chamber 24 communicating with the mixing chamber 22 is provided at the other end of the mixing shell 21. An inlet 211 communicating with the mixing chamber 22 is fixedly installed on one side of the mixing shell 21. like Figure 3 As shown, a number of mixing grooves 221 are symmetrically opened on the side wall of the mixing chamber 22. A fixed bracket 222 is fixedly installed in the mixing chamber 22 near the drive chamber 23. The mixing grooves 221 enhance the mixing path of the material in the mixing chamber 22 and improve the mixing uniformity. The mixing grooves 221 on the side wall of the mixing chamber 22 form a turbulence structure, which forces the material to be repeatedly divided and recombined during the axial conveying process. The mixed molten material is extruded to the molding part 4 through the extrusion chamber 24. The material forms turbulence in the mixing grooves 221 to avoid stratification and ensure that the functional additives are evenly dispersed. like Figure 2 As shown, the stirring part 3 is rotatably installed in the mixing chamber 22. The stirring part 3 includes a rotating shaft 31. One end of the rotating shaft 31 passes through the mixing chamber 22 and is located in the driving chamber 23. The other end of the rotating shaft 31 is rotatably installed in the fixed bracket 222. A conveying blade 311 is fixedly installed on the side wall of the rotating shaft 31. The conveying blade 311 pushes the uniformly mixed molten material toward the extrusion chamber 24. like Figure 4 , Figure 5 As shown, the stirring unit 3 also includes two driven shafts 32. One end of the driven shaft 32 passes through the mixing chamber 22 and is located in the driving chamber 23. The other end of the driven shaft 32 is rotatably installed in the fixed bracket 222. Stirring blades 321 are fixedly installed on the side wall of the driven shaft 32. The stirring blades 321 dynamically shear, mix and heat the raw materials. The reverse motion of the two shafts makes the material bear bidirectional shear force in the narrow gap, increasing the shearing efficiency. like Figure 4As shown, a motor 231 is fixedly installed in the drive cavity 23. The output shaft of the motor 231 is fixedly connected to the rotating shaft 31. The motor 231 drives the rotating shaft 31 to rotate, which drives the conveying blades 311 to push the material. At the same time, through the meshing of the drive gear 312 and the driven gear 322, the driven shaft 32 rotates synchronously in the opposite direction. The stirring blades 321 perform high-intensity shearing on the material, and the material forms a vortex in the mixing tank 221, which enhances the distribution and mixing effect and ensures the uniformity of the blend. like Figure 4 , Figure 5 As shown, a drive gear 312 is fixedly installed at one end of the rotating shaft 31, and a driven gear 322 is fixedly installed at one end of the driven shaft 32. The drive gear 312 meshes with the driven gear 322. like Figure 2 As shown, the forming part 4 includes a mounting frame 41, which includes several support shafts 42. Two positive and negative pressure forming molds 43 are slidably installed between the support shafts 42. The surface of the mounting frame 41 is provided with a mounting groove 411. A cylinder 412 is fixedly installed in the mounting groove 411. One end of the piston rod of the cylinder 412 is fixedly installed on one side of the positive and negative pressure forming mold 43. The extruded sheet enters the forming part 4. The cylinder 412 pushes the positive and negative pressure forming mold 43 to close, clamping the sheet. High-pressure air is injected into the upper mold to initially extend the sheet. The lower mold is vacuumed, and the sheet is tightly attached to the mold cavity to form a precise contour. The positive and negative pressure work together to ensure uniform forming thickness and clear details, avoiding defects such as bubbles and deformation. In practical use, food-grade plastic granules are fed into the mixing chamber 22 through the feed inlet 211. The motor 231 drives the rotating shaft 31 to rotate, which in turn drives the conveying blades 311 to propel the material. Simultaneously, through the meshing of the drive gear 312 and the driven gear 322, the driven shaft 32 rotates synchronously in the opposite direction. The stirring blades 321 perform high-intensity shearing on the material, forming a vortex in the mixing tank 221, enhancing the distribution and mixing effect, and ensuring uniform mixing. The stirring blades 321 dynamically shear, mix, and heat the raw materials, while the conveying blades 311 propel the uniformly mixed molten material towards the extrusion chamber 24. The dual-shaft reverse motion causes the material to withstand bidirectional shearing force within the narrow gap, increasing shearing efficiency and mixing... The mixing groove 221 enhances the mixing path of the material in the mixing chamber 22, improving the uniformity of blending. The mixing groove 221 on the side wall of the mixing chamber 22 forms a turbulence structure, forcing the material to be repeatedly divided and recombined during axial conveying. The mixed molten material is extruded through the extrusion chamber 24 to the forming section 4. The extruded sheet enters the forming section 4. The cylinder 412 pushes the positive and negative pressure forming mold 43 to close, clamping the sheet. High-pressure air is injected into the upper mold to initially extend the sheet. The lower mold is vacuumed, and the sheet is tightly attached to the mold cavity to form a precise contour. The positive and negative pressure work together to ensure uniform forming thickness and clear details, avoiding defects such as bubbles and deformation. The material forms turbulence in the mixing groove 221 to avoid stratification and ensure uniform dispersion of functional additives.

[0018] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A positive and negative pressure servo thermoforming machine based on dynamic blending process, comprising a support (1) and a dynamic blending part (2) fixedly installed on the support (1), wherein a forming part (4) is fixedly installed on one side of the support (1), characterized in that, Also includes: The stirring part (3) is rotatably installed in the dynamic mixing part (2). The stirring part (3) melts and mixes the raw materials and then conveys them to the molding part (4) for positive and negative pressure molding.

2. The positive and negative pressure servo thermoforming machine based on dynamic blending process according to claim 1, characterized in that, The dynamic blending section (2) includes a mixing shell (21), which is fixedly installed on the support (1). A mixing chamber (22) is provided inside the mixing shell (21). A driving chamber (23) is provided at one end of the mixing shell (21), and an extrusion chamber (24) communicating with the mixing chamber (22) is provided at the other end of the mixing shell (21). An inlet (211) communicating with the mixing chamber (22) is fixedly installed on one side of the mixing shell (21).

3. The positive and negative pressure servo thermoforming machine based on dynamic blending process according to claim 2, characterized in that, The mixing chamber (22) has several mixing grooves (221) symmetrically opened on the side wall, and a fixed bracket (222) is fixedly installed in the mixing chamber (22) near the drive chamber (23).

4. The positive and negative pressure servo thermoforming machine based on dynamic blending process according to claim 1, characterized in that, The stirring part (3) is rotatably installed in the mixing chamber (22). The stirring part (3) includes a rotating shaft (31). One end of the rotating shaft (31) passes through the mixing chamber (22) and is located in the driving chamber (23). The other end of the rotating shaft (31) is rotatably installed in the fixed bracket (222). A conveying blade (311) is fixedly installed on the side wall of the rotating shaft (31).

5. The positive and negative pressure servo thermoforming machine based on dynamic blending process according to claim 1, characterized in that, The stirring part (3) also includes two driven shafts (32). One end of the driven shaft (32) passes through the mixing chamber (22) and is located in the driving chamber (23). The other end of the driven shaft (32) is rotatably installed in the fixed bracket (222). A stirring blade (321) is fixedly installed on the side wall of the driven shaft (32).

6. The positive and negative pressure servo thermoforming machine based on dynamic blending process according to claim 2, characterized in that, A motor (231) is fixedly installed inside the drive cavity (23), and the output shaft of the motor (231) is fixedly connected to the rotating shaft (31).

7. The positive and negative pressure servo thermoforming machine based on dynamic blending process according to claim 4, characterized in that, A drive gear (312) is fixedly installed at one end of the rotating shaft (31), and a driven gear (322) is fixedly installed at one end of the driven shaft (32). The drive gear (312) meshes with the driven gear (322).

8. The positive and negative pressure servo thermoforming machine based on dynamic blending process according to claim 1, characterized in that, The molding part (4) includes a mounting frame (41), which includes several support shafts (42). Two positive and negative pressure molding molds (43) are slidably installed between the several support shafts (42). The mounting frame (41) has a mounting groove (411) on its surface. A cylinder (412) is fixedly installed in the mounting groove (411). One end of the piston rod of the cylinder (412) is fixedly installed on one side of the positive and negative pressure molding mold (43).

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