Automatic production line and process for PET plastic bottle blanks

Abstract

The invention belongs to the technical field of automatic production lines, and discloses an automatic production line and process of PET plastic bottle blanks, the automatic production line comprises an injection molding fixed template, an injection molding movable template is arranged on one side of the injection molding fixed template, and an ejection structure is arranged on one side of the injection molding movable template; the ejection structure comprises an ejector plate, an electric telescopic rod, a fixed rod, a mounting block, an ejector, a limiting structure and an adjusting structure, the electric telescopic rod is fixedly mounted on one side of the injection molding movable mold plate, the ejector plate is fixedly mounted on one side of the electric telescopic rod, and the fixed rod is arranged on one side of the ejector plate. The ejection direction is flexibly changed by adjusting the angle of the ejector pin for the bottle blank with different design structures of side recesses, inverted buckles and inclined reinforcing ribs, and then proper ejection force is accurately applied in the demolding direction of each part of the bottle blank, so that the bottle blank is smoothly separated from a mold, and the demolding success rate is conveniently improved.

Description

Technical Field

[0001] The invention belongs to the technical field of automated production lines, and in particular relates to an automated production line for PET plastic bottle preforms and a process thereof. Background Art

[0002] PET, or polyethylene terephthalate, has a highly symmetrical molecular structure and a certain degree of crystal orientation, resulting in high film-forming properties. PET also offers excellent optical properties and weather resistance, and its amorphous state exhibits excellent transparency. Bottles made from PET possess excellent mechanical properties, along with advantages such as good transparency, non-toxicity, impermeability, light weight, and high production efficiency. This has led to its widespread application. The production of preforms is accomplished through automated production lines, which involve raw material conveying and drying, plasticization through injection molds, injection, pressure holding, cooling, and demolding.

[0003] However, in the prior art, when a preform has different design structures such as undercuts, undercuts, and oblique ribs, the ejector pin of the ejection structure cannot flexibly change the ejection direction according to the specific demolding requirements of these complex shapes. As a result, it is impossible to accurately apply the appropriate ejection force along the demolding direction of each part of the preform to smoothly eject the preform from the mold, which is not conducive to improving the success rate of demolding. Summary of the Invention

[0004] The present invention aims to solve the problems in the prior art and proposes the following technical solutions: an automated production line for PET plastic bottle blanks, comprising a fixed injection molding template, a movable injection molding template provided on one side of the fixed injection molding template, and an ejection structure provided on one side of the movable injection molding template;

[0005] The ejection structure includes an ejector plate, an electric telescopic rod, a fixed rod, a mounting block, an ejector, a limiting structure and an adjustment structure. The electric telescopic rod is fixedly installed on one side of the injection molding movable template, and the ejector plate is fixedly installed on one side of the electric telescopic rod. A fixed rod is provided on one side of the ejector plate, a mounting block is fixedly installed on the outside of one end of the fixed rod, and an ejector is provided on the other end of the fixed rod. An adjustment structure is provided between the ejector and the fixed rod, and the adjustment structure is located inside the mounting block. A limiting structure is provided on the outside of the ejector and the mounting block.

[0006] As a preferred embodiment of the above technical solution, the fixing rod is fixedly installed through the ejector plate and the injection movable template at one end away from the mounting block. The fixing rod, the mounting block and the ejector are located on one side of the ejector plate and are distributed in a linear array. Movable openings are provided on the upper and lower sides of the mounting block. A connecting spring is provided on one side of the adjustment structure, and one end of the connecting spring is fixedly installed on the inner wall of the mounting block.

[0007] As a preferred embodiment of the above technical solution, the adjustment structure includes a first motor, a first rotating rod, a mounting plate and a fixed block. The fixed rod is rotatably connected to the fixed block at one end close to the ejector pin, one side of the fixed block is fixedly installed with the ejector pin, and the first motor is arranged on the other side of the fixed block. The output end of the first motor is transmission-connected to the first rotating rod, the middle part of the first rotating rod is rotatably connected to the fixed rod, both ends of the first rotating rod are fixedly connected to the mounting plates, and one side of the mounting plate is fixedly installed with the fixed block.

[0008] As a preferred embodiment of the above technical solution, a fixed plate is fixedly installed on one side of the first motor, and a connecting rod is fixedly installed on one side of the fixed plate. The connecting rod is fixedly installed on the inner wall of the mounting block, and one side of the first rotating rod is rotatably connected to the inner wall of the mounting block. The fixed block is located at the movable opening, and the connecting springs are located on both sides of the fixed rod. One end of the connecting spring is fixedly installed on one side of the fixed block.

[0009] As a preferred embodiment of the above technical solution, a fixed structure is provided inside the fixed block, and the fixed structure includes a second motor, a movable rod, a connecting block, a movable block, a pushing plate, a moving block and a limiting plate. The output end of the second motor is transmission-connected to the movable rod, the bottom of the movable rod is rotatably connected to the connecting block, one end of the movable rod is threadedly connected to the movable block, both sides of the movable block are movably connected to the inner wall of the fixed block, both ends of the movable block are hinged to the pushing plate, one end of the pushing plate is hinged to the moving block, the bottom of the moving block is slidingly connected to the top of the connecting block, and the inner wall of one side of the moving block is movably connected to the limiting plate.

[0010] As a preferred embodiment of the above technical solution, a mounting groove is provided on one side of the limiting plate, a compression spring is fixedly installed on the inner wall of the mounting groove, one end of the compression spring is fixedly installed on the inner wall of the moving block, a first magnetic block is fixedly installed on the other side of the limiting plate, two slots are provided on the inner wall of the mounting block, the limiting plate is plugged into the two slots, a second magnetic block is fixedly installed on the inner walls of the two slots, and the first magnetic block is magnetically connected to the second magnetic block.

[0011] As a preferred embodiment of the above technical solution, the top of the second motor is fixedly installed on the inner wall of the fixed block, the connecting block is fixedly installed on the inner wall of the fixed block, and two symmetrically arranged movable openings are opened on the outside of the fixed block. The movable openings are arranged corresponding to the slots, and the limiting plate extends through the movable openings into the slot.

[0012] As a preferred embodiment of the above technical solution, the limiting structure includes a first electric push rod, a moving ring, a second electric push rod and a clamping moving block. The moving ring is fixedly installed on one end of the first electric push rod, the second electric push rod is fixedly installed on the inner wall of the moving ring, and the clamping moving block is fixedly installed on one side of the second electric push rod, and one side of the clamping moving block is in contact with the outer wall of the ejector pin.

[0013] As a preferred embodiment of the above technical solution, two movable grooves are opened on both sides of the mounting block and on one side of the ejector plate, the first electric push rod is located on both sides of the mounting block, one end of the first electric push rod extends into the two movable grooves and is fixedly installed with a second rotating rod, both ends of the second rotating rod are rotatably connected to the inner wall of the movable groove, the movable ring is located on the outside of one end of the mounting block, and the second electric push rod and the clamping movable block are symmetrically arranged inside the movable ring.

[0014] The present invention also provides a process for an automated production line using the above-mentioned PET plastic bottle blank, comprising the following steps:

[0015] Step 1: The PET plastic raw material is transported to the drying equipment through the conveying equipment. The dried PET raw material is added to the barrel of the injection molding machine to plasticize the raw material into a uniform viscous melt. The plasticized melt is then quickly injected into the mold cavity of the injection molding fixed template through the nozzle of the injection molding machine, so that the melt can evenly, quickly and completely fill the entire mold cavity;

[0016] Step 2: After the melt fills the cavity, a certain pressure is maintained, and the mold is cooled by circulating cooling water through the cooling water channel set in the injection movable template, so that the bottle blank is quickly solidified and formed. When the bottle blank is cooled to a sufficient strength and can maintain its shape, the injection movable template moves to move the bottle blank out of the cavity. The electric telescopic rod pushes the ejector plate to move, and the ejector plate drives the first electric push rod and the movable ring to move, and the second electric push rod drives the clamping movable block to move away from the mounting block, so that the clamping movable block moves along the outer wall of the ejector, ejecting the bottle blank on the ejector and separating it from the mold. Then, the bottle blank is smoothly taken out by a robotic arm or a conveyor belt and transferred to the next process position.

[0017] Step 3: When the bottle blank has different design structures such as undercut, undercut, and oblique reinforcement ribs, first start the second motor to drive the movable rod to rotate along the connecting block, so that the movable block moves upward along the movable rod, and the push plate deflects to drive the movable block to move. When the movable block moves, the limiting plate is driven by the action of the compression spring to move from the movable mouth to the inside of the fixed block, so that the first magnetic block is separated from the second magnetic block, and then the limiting plate is separated from the slot and moved to the inside of the fixed block, no longer limiting the ejector and the mounting block, and then start the first motor to drive the first rotating rod to rotate along the inner wall of the mounting slot, so that the mounting plate drives the fixed block and the ejector to rotate, and adjusts the angle of the ejector. Since the clamping movable block is in contact with the outer wall of the ejector, the ejector drives the clamping movable block when it rotates. The block, the second electric push rod, the moving ring and the first electric push rod rotate, so that the first electric push rod drives the second rotating rod to rotate along the inner wall of the moving groove, so that the clamping moving block can clamp and limit the ejector pin after the angle is adjusted, so as to improve the stability of the ejector pin, and then perform the plasticizing, injection, pressure holding and cooling steps, and then the first electric push rod drives the moving ring, the second electric push rod and the clamping moving block to move simultaneously, so that the moving ring and the clamping moving block move along the ejector pin, and eject the preform on the ejector pin, so that it is separated from the mold. After the demoulding is completed, the first motor drives the rotating rod to rotate, so that the fixed block and the ejector pin move to their original positions, and at the same time, the first electric push rod, the moving ring, the second electric push rod and the clamping moving block move to their original positions.

[0018] Step 4: After the preform is demoulded, the first electric push rod pushes the moving ring, the second electric push rod and the clamping moving block again, so that the clamping moving block can remove the residual material remaining on the ejector pin to ensure the smoothness of the ejection action. After the removal is completed, the sprue is accurately removed by tool cutting or laser cutting, so that the preform has a neat appearance and meets the size requirements. After quality inspection, it is packaged and put into storage.

[0019] The beneficial effects of the present invention are:

[0020] (1) The present invention can adjust the angle of the ejector pin and flexibly change the ejection direction for preforms with different design structures such as undercuts, undercuts, and oblique reinforcement ribs, thereby accurately applying a suitable ejection force along the demoulding direction of various parts of the preform, thereby smoothly ejecting the preform from the mold and improving the success rate of demoulding;

[0021] (2) The present invention moves the first electric push rod, the moving ring, the second electric push rod and the clamping moving block, so as to facilitate the ejection of the bottle blank on the ejector after the angle is adjusted. At the same time, the ejector is limited to prevent shaking, deviation and the like during the ejection process, which affects the ejection effect. Moreover, when the clamping moving block moves along the outer wall of the ejector, the residual material remaining on the ejector can be removed, thereby ensuring the smoothness of the ejection action and facilitating the improvement of the ejection effect of the ejector. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 What is shown is a schematic diagram of the overall structure of the embodiment;

[0023] Figure 2 Shown is a structural diagram of an injection molding movable template according to an embodiment;

[0024] Figure 3 Shown is a structural diagram of an injection molding movable template and an ejector plate according to an embodiment;

[0025] Figure 4 Shown is a structural diagram of the electric telescopic rod and the ejector plate of the embodiment;

[0026] Figure 5 Shown is a structural diagram of a fixing rod, a mounting block, and an ejector pin in an embodiment;

[0027] Figure 6 Shown is a diagram of the internal structure of the mounting block of an embodiment;

[0028] Figure 7 Shown is a structural diagram of the ejector pin and the adjustment structure of the embodiment;

[0029] Figure 8 Shown is a structural diagram of a fixed structure of an embodiment;

[0030] Figure 9 Shown is a structural diagram of the structure defined in the embodiment;

[0031] Figure 10 Shown is a structural diagram of a moving ring and a clamping moving block according to an embodiment.

[0032] In the figure: 1. Injection molding fixed template; 2. Injection molding movable template; 3. Ejector plate; 4. Electric telescopic rod; 5. Fixed rod; 6. Mounting block; 7. Ejector; 8. Connecting spring; 9. First motor; 10. First rotating rod; 11. Mounting plate; 12. Fixed block; 13. Fixed plate; 14. Connecting rod; 15. Second motor; 16. Movable rod; 17. Connecting block; 18. Movable block; 19. Pushing plate; 20. Moving block; 21. Limiting plate; 22. First magnetic block; 23. Second magnetic block; 24. First electric push rod; 25. Moving ring; 26. Second electric push rod; 27. Clamping moving block; 28. Second rotating rod. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0034] The present invention provides an automated production line for PET plastic bottle preforms, such as Figures 1 to 4As shown, it includes an injection molding fixed template 1, an injection molding movable template 2 is provided on one side of the injection molding fixed template 1, and an ejection structure is provided on one side of the injection molding movable template 2;

[0035] The ejection structure includes an ejector plate 3, an electric telescopic rod 4, a fixed rod 5, a mounting block 6, an ejector 7, a limiting structure and an adjustment structure. The electric telescopic rod 4 is fixedly installed on one side of the injection movable template 2, and the ejector plate 3 is fixedly installed on one side of the electric telescopic rod 4. A fixed rod 5 is provided on one side of the ejector plate 3, and a mounting block 6 is fixedly installed on the outside of one end of the fixed rod 5. An ejector 7 is provided on the other end of the fixed rod 5. An adjustment structure is provided between the ejector 7 and the fixed rod 5. The adjustment structure is located inside the mounting block 6, and a limiting structure is provided on the outside of the ejector 7 and the mounting block 6.

[0036] The fixed injection template 1 and the movable injection template 2 facilitate the rapid injection of plasticized raw materials by the injection molding machine nozzle to form a preform. When the preform cools to a sufficient strength and can maintain its shape, the movable injection template 2 moves to move the preform out of the cavity, and then the electric telescopic rod 4 pushes the ejector plate 3 to move. The ejector plate 3 drives the limiting structure to move along the ejector 7 to eject the preform on the ejector 7 and separate it from the ejector 7. Then, the preform is smoothly taken out by a robotic arm or a conveyor belt and transferred to the next process position. The angle of the ejector 7 can be adjusted by the adjustment structure to adapt to preforms with different design structures such as undercuts, undercuts, and oblique reinforcement ribs. The ejection direction can be flexibly changed, and then the appropriate ejection force can be accurately applied along the demoulding direction of each part of the preform, thereby smoothly ejecting the preform from the mold, thereby improving the success rate of demoulding.

[0037] like Figures 1 to 4 As shown, the end of the fixing rod 5 away from the mounting block 6 passes through the ejector plate 3 and is fixedly installed with the injection movable template 2. The fixing rod 5, the mounting block 6 and the ejector 7 are located on one side of the ejector plate 3 and are distributed in a linear array. The mounting block 6 is provided with movable openings on both the upper and lower sides. A connecting spring 8 is provided on one side of the adjustment structure, and one end of the connecting spring 8 is fixedly installed with the inner wall of the mounting block 6.

[0038] The fixing rod 5 is fixed by the movable injection molding template 2, which can drive the fixing rod 5, the mounting block 6, the adjusting structure, the limiting structure and the ejector 7 to move when the movable injection molding template 2 moves, so that the limiting structure can eject the bottle blank on the ejector 7. The fixing rod 5, the mounting block 6 and the ejector 7 distributed in a linear array can eject multiple bottle blanks at the same time, thereby improving the ejection efficiency. The movable opening facilitates the adjustment structure to adjust the ejector 7 to rotate, so that the ejector 7 is rotated to different angles, which is convenient for adapting to bottle blanks with different structures, and then quickly ejecting the bottle blank. The stability of the adjustment structure when rotating in the mounting block 6 is improved by connecting the spring 8.

[0039] like Figures 6 and 7As shown, the adjustment structure includes a first motor 9, a first rotating rod 10, a mounting plate 11 and a fixed block 12. The fixed rod 5 is rotatably connected to the fixed block 12 at one end near the ejector pin 7. One side of the fixed block 12 is fixedly installed with the ejector pin 7. The first motor 9 is arranged on the other side of the fixed block 12. The output end of the first motor 9 is transmission-connected with the first rotating rod 10. The middle part of the first rotating rod 10 is rotatably connected to the fixed rod 5. Both ends of the first rotating rod 10 are fixedly connected to the mounting plates 11. One side of the mounting plate 11 is fixedly installed with the fixed block 12. A fixing plate 13 is fixedly installed on one side of the first motor 9. A connecting rod 14 is fixedly installed on one side of the fixing plate 13. The connecting rod 14 is fixedly installed on the inner wall of the mounting block 6. One side of the first rotating rod 10 is rotatably connected to the inner wall of the mounting block 6. The fixed block 12 is located at the movable opening. The connecting spring 8 is located on both sides of the fixed rod 5. One end of the connecting spring 8 is fixedly installed on one side of the fixed block 12.

[0040] The first motor 9 is fixed by the fixing plate 13 and the connecting rod 14, and then the first motor 9 is started to drive the first rotating rod 10 to rotate along the inner wall of the mounting groove, thereby improving the stability during rotation, so that the mounting plate 11 drives the fixing block 12 and the ejector pin 7 to rotate, and at the same time can adjust the angle of the ejector pin 7. When the fixing block 12 rotates, the connecting spring 8 is stretched and deformed, further improving the stability of the fixing block 12 during rotation, making it easier for the ejector pin 7 to rotate and adapting to bottle preforms with different structures.

[0041] like Figures 5 to 8 As shown, a fixed structure is provided inside the fixed block 12, and the fixed structure includes a second motor 15, a movable rod 16, a connecting block 17, a movable block 18, a pushing plate 19, a moving block 20 and a limiting plate 21. The output end of the second motor 15 is connected to the movable rod 16 in a transmission manner. The bottom of the movable rod 16 is rotatably connected to the connecting block 17. One end of the movable rod 16 is threadedly connected to the movable block 18. Both sides of the movable block 18 are movably connected to the inner wall of the fixed block 12. Both ends of the movable block 18 are hinged to the pushing plate 19. One end of the pushing plate 19 is hinged to the moving block 20. The bottom of the moving block 20 is slidably connected to the top of the connecting block 17. A limiting plate 21 is movably connected to the inner wall of one side of the moving block 20. A mounting groove is provided on one side of the limiting plate 21. A compression spring is fixedly installed on the inner wall of the mounting groove. One end of the compression spring is fixedly installed on the inner wall of the moving block 20. A first magnetic block 22 is fixedly installed on the other side of the limiting plate 21. Two slots are provided on the inner wall of the mounting block 6. The limiting plate 21 is plugged into the two slots. Second magnetic blocks 23 are fixedly installed on the inner walls of the two slots. The first magnetic block 22 is magnetically connected to the second magnetic block 23.

[0042] Starting the second motor 15 drives the movable rod 16 to rotate along the connecting block 17, so that the movable block 18 moves along the inner wall of the fixed block 12 and moves upward along the movable rod 16, so that the push plate 19 is deflected and drives the movable block 20 to move. When the movable block 20 moves, the limiting plate 21 is driven by the action of the compression spring to move from the moving mouth to the inside of the fixed block 12, so that the first magnetic block 22 and the second magnetic block 23 are separated, and then the limiting plate 21 is separated from the slot and moved to the inside of the fixed block 12, no longer limiting the ejector 7 and the mounting block 6. At this time, the first motor 9 drives the first rotating rod 10 to rotate along the inner wall of the mounting groove, so that the mounting plate 11 drives the fixed block 12 and the ejector 7 to rotate, thereby adjusting the angle of the ejector 7 to facilitate improving the ejection effect.

[0043] like Figures 7 and 8 As shown, the top of the second motor 15 is fixedly installed on the inner wall of the fixed block 12, the connecting block 17 is fixedly installed on the inner wall of the fixed block 12, and two symmetrically arranged movable openings are opened on the outside of the fixed block 12. The movable openings are arranged corresponding to the slots, and the limiting plate 21 extends through the movable openings into the slot.

[0044] The fixing block 12 facilitates the installation of the second motor 15, and the connecting block 17 facilitates the second motor 15 to drive the movable rod 16 to remain stable when rotating, so that the movable block 18 can move to drive the push plate 19 to deflect, so that the movable block 20 drives the limiting plate 21 to move along the top of the connecting block 17, so that the limiting plate 21 can be separated from the moving port and the slot and moved to the inside of the fixed block 12, so that the fixed block 12 can drive the ejector 7 to rotate and adjust the angle. When the angle does not need to be adjusted, the ejector 7 is rotated to its original position, and the limiting plate 21 is then plugged into the slot to improve the stability of the ejector 7 when it is ejected.

[0045] like Figure 2 、 Figure 9 、 Figure 10 As shown, the limiting structure includes a first electric push rod 24, a moving ring 25, a second electric push rod 26 and a clamping moving block 27. The moving ring 25 is fixedly installed at one end of the first electric push rod 24, and the second electric push rod 26 is fixedly installed on the inner wall of the moving ring 25. The clamping moving block 27 is fixedly installed on one side of the second electric push rod 26. One side of the clamping moving block 27 is in contact with the outer wall of the ejector 7. Two moving grooves are provided on both sides of the mounting block 6 and on one side of the ejector plate 3. The first electric push rod is located on both sides of the mounting block 6. One end of the first electric push rod 24 extends into the two moving grooves and is fixedly installed with a second rotating rod 28. Both ends of the second rotating rod 28 are rotatably connected to the inner wall of the moving groove. The moving ring 25 is located on the outside of one end of the mounting block 6, and the second electric push rod 26 and the clamping moving block 27 are symmetrically arranged inside the moving ring 25.

[0046] When the angle of the ejector 7 needs to be adjusted, since the clamping moving block 27 is in contact with the outer wall of the ejector 7, when the ejector 7 rotates, it drives the clamping moving block 27, the second electric push rod 26, the moving ring 25 and the first electric push rod 24 to rotate, so that the first electric push rod 24 drives the second rotating rod 28 to rotate along the inner wall of the moving groove, so that the clamping moving block 27 can clamp and limit the ejector 7 after the angle is adjusted, which is convenient for improving the stability of the ejector 7. Then, the plasticizing, injection, pressure holding and cooling steps are carried out, and then the first electric push rod 24 drives the moving ring 25, the second electric push rod 26 and the clamping moving block 27 to move simultaneously. , so that the movable ring 25 and the clamping movable block 27 move along the ejector 7, ejecting the bottle blank on the ejector 7 and separating it from the mold. After the demolding is completed, the first motor 9 drives the rotation of the rotating rod to move the fixed block 12 and the ejector 7 to their original positions, and at the same time, the first electric push rod 24, the movable ring 25, the second electric push rod 26 and the clamping movable block 27 are moved to their original positions, thereby improving the ejection stability of the adjusted ejector 7, and when the clamping movable block 27 moves, the clamping movable block 27 can remove the residual material remaining on the ejector 7, thereby improving the ejection effect and reducing the wear of the ejector 7.

[0047] The present invention also provides a process for an automated production line using the above-mentioned PET plastic bottle blank, comprising the following steps:

[0048] Step 1: The PET plastic raw material is transported to the drying equipment through the conveying equipment. The dried PET raw material is added to the barrel of the injection molding machine to plasticize the raw material into a uniform viscous melt. The plasticized melt is then quickly injected into the mold cavity of the injection molding fixed template 1 through the nozzle of the injection molding machine, so that the melt can evenly, quickly and completely fill the entire mold cavity.

[0049] Step 2: After the melt fills the cavity, a certain pressure is maintained, and the mold is cooled by circulating cooling water through the cooling water channel provided in the injection movable template 2, so that the bottle blanks are quickly solidified and formed. When the bottle blanks are cooled to a sufficient strength and can maintain their shape, the injection movable template 2 moves, and the bottle blanks are moved out of the cavity. The electric telescopic rod 4 pushes the ejector plate 3 to move, and the ejector plate 3 drives the first electric push rod 24 and the movable ring 25 to move, and the second electric push rod 26 drives the clamping movable block 27 to move away from the mounting block 6, so that the clamping movable block 27 moves along the outer wall of the ejector 7, ejecting the bottle blanks on the ejector 7 and separating them from the mold. Then, a robot arm or a conveyor belt is used to smoothly remove the bottle blanks and transfer them to the next process position.

[0050] Step 3: When the bottle preform has different design structures such as undercut, undercut and oblique reinforcement ribs, first start the second motor 15 to drive the movable rod 16 to rotate along the connecting block 17, so that the movable block 18 moves upward along the movable rod 16, and the pushing plate 19 is deflected to drive the movable block 20 to move. When the movable block 20 moves, the limiting plate 21 is driven by the action of the compression spring to move from the movable mouth to the inside of the fixed block 12, so that the first magnetic block 22 and the second magnetic block 23 are separated, and then the limiting plate 21 is separated from the slot and moved to the inside of the fixed block 12, no longer limiting the ejector 7 and the mounting block 6, and then start the first motor 9 to drive the first rotating rod 10 to rotate along the inner wall of the mounting groove, so that the mounting plate 11 drives the fixed block 12 and the ejector 7 to rotate, and adjusts the angle of the ejector 7. Since the clamping movable block 27 is in contact with the outer wall of the ejector 7, when the ejector 7 rotates, it drives the clamping movable block 27 to move. The movable block 27, the second electric push rod 26, the movable ring 25 and the first electric push rod 24 rotate, so that the first electric push rod 24 drives the second rotating rod 28 to rotate along the inner wall of the movable groove, so that the clamping movable block 27 can clamp and limit the ejector 7 after the angle is adjusted, so as to improve the stability of the ejector 7, and then perform the plasticizing, injection, pressure holding and cooling steps. The first electric push rod 24 then pushes the movable ring 25, the second electric push rod 26 and the clamping movable block 27 to move simultaneously, so that the movable ring 25 and the clamping movable block 27 move along the ejector 7, and eject the preform on the ejector 7 and separate it from the mold. After the demoulding is completed, the first motor 9 drives the rotating rod to rotate, so that the fixed block 12 and the ejector 7 move to their original positions, and at the same time, the first electric push rod 24, the movable ring 25, the second electric push rod 26 and the clamping movable block 27 move to their original positions.

[0051] Step 4: After the preform is demoulded, the first electric push rod 24 pushes the moving ring 25, the second electric push rod 26 and the clamping moving block 27 again, so that the clamping moving block 27 can remove the residual material remaining on the ejector 7 to ensure the smoothness of the ejection action. After the cleaning is completed, the sprue is accurately removed by tool cutting or laser cutting, so that the preform has a neat appearance and meets the requirements of size. After quality inspection, it is packaged and put into storage.

[0052] Working principle: When in use, the PET plastic raw material is first transported to the drying equipment through the conveying equipment, and the dried PET raw material is added to the barrel of the injection molding machine to plasticize the raw material into a uniform viscous melt. The plasticized melt is then quickly injected into the cavity of the injection molding fixed template 1 through the nozzle of the injection molding machine, so that the melt can fill the entire cavity evenly, quickly and completely. After the melt fills the cavity, a certain pressure is maintained, and the cooling water channel set in the injection molding movable template 2 is used to cool the mold with circulating cooling water, so that the bottle preform can be quickly solidified and formed. After the preform has cooled to a sufficient strength and can maintain its shape, the injection molding movable template 2 moves to move the preform out of the mold cavity and push the ejector plate 3 to move through the electric telescopic rod 4. The ejector plate 3 drives the first electric push rod 24 and the movable ring 25 to move, and causes the second electric push rod 26 to drive the clamping movable block 27 to move away from the mounting block 6, so that the clamping movable block 27 moves along the outer wall of the ejector 7, ejecting the preform on the ejector 7 and separating it from the mold. Then, the preform is smoothly taken out by a robotic arm or a conveyor belt and transferred to the next process position.

[0053] When the bottle preform has different design structures such as undercut, undercut and oblique reinforcing ribs, the second motor 15 is first started to drive the movable rod 16 to rotate along the connecting block 17, so that the movable block 18 moves upward along the movable rod 16, and the pushing plate 19 is deflected to drive the movable block 20 to move. When the movable block 20 moves, the limiting plate 21 is driven by the action of the compression spring to move from the movable mouth to the inside of the fixed block 12, so that the first magnetic block 22 and the second magnetic block 23 are separated, and then the limiting plate 21 is separated from the slot and moved to the inside of the fixed block 12, no longer limiting the ejector 7 and the mounting block 6. Then the first motor 9 is started to drive the first rotating rod 10 to rotate along the inner wall of the mounting groove, so that the mounting plate 11 drives the fixed block 12 and the ejector 7 to rotate, and adjusts the angle of the ejector 7. Since the clamping movable block 27 is in contact with the outer wall of the ejector 7, when the ejector 7 rotates, it drives the clamping movable block 27, the second electric push rod 26, the moving ring 25 and the first electric push rod 24 rotate, so that the first electric push rod 24 drives the second rotating rod 28 to rotate along the inner wall of the moving groove, so that the clamping moving block 27 can clamp and limit the ejector 7 after the angle is adjusted, so as to improve the stability of the ejector 7, and then perform the plasticizing, injection, holding pressure and cooling steps, and then the first electric push rod 24 pushes the moving ring 25, the second electric push rod 26 and the clamping moving block 27 to move simultaneously, so that the moving ring 25 and the clamping moving block 27 move along the ejector 7, and the bottle blank on the ejector 7 is ejected and separated from the mold. After the demoulding is completed, the first motor 9 drives the rotating rod to rotate, so that the fixed block 12 and the ejector 7 move to their original positions, and at the same time, the first electric push rod 24, the moving ring 25, the second electric push rod 26 and the clamping moving block 27 move to their original positions.

[0054] After the preform is demoulded, the first electric push rod 24 pushes the moving ring 25, the second electric push rod 26 and the clamping moving block 27 to move, so that the clamping moving block 27 can remove the residual material remaining on the ejector pin 7 to ensure the smoothness of the ejection action. After the cleaning is completed, the sprue is accurately removed by tool cutting or laser cutting, so that the preform has a neat appearance and meets the requirements of size. After quality inspection, it is packaged and put into storage.

[0055] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same.

Claims

1. An automated production line for PET plastic preforms, comprising an injection molding fixed template (1), characterized in that: A movable injection mold template (2) is provided on one side of the fixed injection mold template (1), and an ejection structure is provided on one side of the movable injection mold template (2); The ejection structure comprises an ejector plate (3), an electric telescopic rod (4), a fixed rod (5), a mounting block (6), an ejector pin (7), a limiting structure and an adjustment structure. The electric telescopic rod (4) is fixedly mounted on one side of the injection molding movable template (2). The ejector plate (3) is fixedly mounted on one side of the electric telescopic rod (4). A fixed rod (5) is provided on one side of the ejector plate (3). The mounting block (6) is fixedly mounted on the outside of one end of the fixed rod (5). The ejector pin (7) is provided on the other end of the fixed rod (5). An adjustment structure is provided between the ejector pin (7) and the fixed rod (5). The adjustment structure is located inside the mounting block (6). A limiting structure is provided between the ejector pin (7) and the outside of the mounting block (6).

2. The automated production line for PET plastic preforms according to claim 1, characterized in that: The fixing rod (5) is fixedly mounted on the injection molding movable template (2) through one end thereof away from the mounting block (6), the fixing rod (5), the mounting block (6) and the ejector pin (7) are arranged on one side of the ejector plate (3) in a linear array, and movable openings are provided on both the upper and lower sides of the mounting block (6). A connecting spring (8) is provided on one side of the adjusting structure, and one end of the connecting spring (8) is fixedly mounted on the inner wall of the mounting block (6).

3. The automated production line for PET plastic preforms according to claim 1, characterized in that: The adjustment structure comprises a first motor (9), a first rotating rod (10), a mounting plate (11) and a fixed block (12); the fixed rod (5) is rotatably connected to the fixed block (12) at one end close to the ejector pin (7); one side of the fixed block (12) is fixedly mounted to the ejector pin (7); a first motor (9) is arranged on the other side of the fixed block (12); an output end of the first motor (9) is transmission-connected to the first rotating rod (10); a middle portion of the first rotating rod (10) is rotatably connected to the fixed rod (5); both ends of the first rotating rod (10) are fixedly connected to the mounting plates (11); one side of the mounting plate (11) is fixedly mounted to the fixed block (12).

4. The automated production line for PET plastic preforms according to claim 3, characterized in that: A fixing plate (13) is fixedly mounted on one side of the first motor (9), a connecting rod (14) is fixedly mounted on one side of the fixing plate (13), the connecting rod (14) is fixedly mounted on the inner wall of the mounting block (6), one side of the first rotating rod (10) is rotatably connected to the inner wall of the mounting block (6), the fixing block (12) is located at the movable opening, the connecting spring (8) is located on both sides of the fixing rod (5), and one end of the connecting spring (8) is fixedly mounted on one side of the fixing block (12).

5. The automated production line for PET plastic preforms according to claim 1, characterized in that: A fixed structure is provided inside the fixed block (12), and the fixed structure includes a second motor (15), a movable rod (16), a connecting block (17), a movable block (18), a pushing plate (19), a moving block (20) and a limiting plate (21). The output end of the second motor (15) is connected to the movable rod (16) in a transmission manner. The bottom of the movable rod (16) is rotatably connected to the connecting block (17). One end of the movable rod (16) is threadedly connected to the movable block (18). Both sides of the movable block (18) are movably connected to the inner wall of the fixed block (12). Both ends of the movable block (18) are hinged to the pushing plate (19). One end of the pushing plate (19) is hinged to the moving block (20). The bottom of the moving block (20) is slidably connected to the top of the connecting block (17). The inner wall of one side of the moving block (20) is movably connected to the limiting plate (21).

6. The automated production line for PET plastic preforms according to claim 5, characterized in that: A mounting groove is provided on one side of the limiting plate (21), a compression spring is fixedly installed on the inner wall of the mounting groove, one end of the compression spring is fixedly installed on the inner wall of the moving block (20), a first magnetic block (22) is fixedly installed on the other side of the limiting plate (21), two slots are provided on the inner wall of the mounting block (6), the limiting plate (21) is plugged into the two slots, and second magnetic blocks (23) are fixedly installed on the inner walls of the two slots, and the first magnetic block (22) is magnetically connected to the second magnetic block (23).

7. The automated production line for PET plastic preforms according to claim 5, characterized in that: The top of the second motor (15) is fixedly mounted on the inner wall of the fixed block (12), and the connecting block (17) is fixedly mounted on the inner wall of the fixed block (12). Two symmetrically arranged movable openings are provided on the outer side of the fixed block (12), and the movable openings are arranged corresponding to the slots. The limiting plate (21) passes through the movable openings and extends into the slots.

8. The automated production line for PET plastic preforms according to claim 1, characterized in that: The limiting structure comprises a first electric push rod (24), a moving ring (25), a second electric push rod (26) and a clamping moving block (27); the moving ring (25) is fixedly mounted on one end of the first electric push rod (24); the second electric push rod (26) is fixedly mounted on the inner wall of the moving ring (25); the clamping moving block (27) is fixedly mounted on one side of the second electric push rod (26); and one side of the clamping moving block (27) is in contact with the outer wall of the ejector pin (7).

9. The automated production line for PET plastic preforms according to claim 8, characterized in that: Two movable grooves are provided on both sides of the mounting block (6) and on one side of the ejector plate (3); the first electric push rod (24) is located on both sides of the mounting block (6); one end of the first electric push rod (24) extends into the two movable grooves and is fixedly installed with a second rotating rod (28); both ends of the second rotating rod (28) are rotatably connected to the inner wall of the movable groove; the movable ring (25) is located outside one end of the mounting block (6); the second electric push rod (26) and the clamping movable block (27) are located inside the movable ring (25) and are symmetrically arranged.

10. A process for an automated production line of PET plastic bottle preforms using any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: The PET plastic raw material is transported to the drying equipment through the conveying equipment, and the dried PET raw material is added to the barrel of the injection molding machine to plasticize the raw material into a uniform viscous melt. The plasticized melt is then quickly injected into the mold cavity of the injection molding fixed template (1) through the nozzle of the injection molding machine, so that the melt can evenly, quickly and completely fill the entire mold cavity; Step 2: After the melt fills the cavity, a certain pressure is maintained, and the mold is cooled and cooled by circulating cooling water through the cooling water channel provided in the injection movable template (2), so that the bottle blank is quickly solidified and formed. When the bottle blank is cooled to a sufficient strength and can maintain its shape, the injection movable template (2) moves, and the bottle blank is moved out of the cavity. The electric telescopic rod (4) pushes the ejector plate (3) to move. The ejector plate (3) drives the first electric push rod (24) and the moving ring (25) to move, and the second electric push rod (26) drives the clamping moving block (27) to move away from the mounting block (6), so that the clamping moving block (27) moves along the outer wall of the ejector pin (7), ejects the bottle blank on the ejector pin (7), and makes it separate from the mold. Then, the bottle blank is smoothly taken out by a robot arm or a conveyor belt and transferred to the next process position. Step 3: When the bottle blank has different design structures such as undercut, undercut and oblique reinforcement ribs, the second motor (15) is first started to drive the movable rod (16) to rotate along the connecting block (17), so that the movable block (18) moves upward along the movable rod (16), and the pushing plate (19) is deflected to drive the movable block (20) to move. When the movable block (20) moves, the limiting plate (21) is driven to move from the movable port to the inside of the fixed block (12) by the action of the compression spring, so that the first magnetic block (22) is in contact with the movable block (18). The second magnetic block (23) is separated, thereby separating the limiting plate (21) from the slot and moving it to the inside of the fixed block (12), no longer limiting the ejector pin (7) and the mounting block (6). Then, the first motor (9) is started to drive the first rotating rod (10) to rotate along the inner wall of the mounting slot, so that the mounting plate (11) drives the fixed block (12) and the ejector pin (7) to rotate, and adjusts the angle of the ejector pin (7). Since the clamping moving block (27) is in contact with the outer wall of the ejector pin (7), when the ejector pin (7) rotates, it drives the clamping moving block (27) to rotate. The moving block (27), the second electric push rod (26), the moving ring (25) and the first electric push rod (24) rotate, so that the first electric push rod (24) drives the second rotating rod (28) to rotate along the inner wall of the moving groove, so that the clamping moving block (27) can clamp and limit the ejector pin (7) after the angle is adjusted, so as to improve the stability of the ejector pin (7), and then perform the plasticizing, injection, pressure holding and cooling steps, and then push the moving ring (25), the second electric push rod (26) and the first electric push rod (24) to move ... The rod (26) and the clamping movable block (27) move simultaneously, so that the movable ring (25) and the clamping movable block (27) move along the ejector pin (7), ejecting the preform on the ejector pin (7) and making it separate from the mold. After the demoulding is completed, the first motor (9) drives the rotating rod to rotate, so that the fixed block (12) and the ejector pin (7) move to their original positions, and at the same time, the first electric push rod (24), the movable ring (25), the second electric push rod (26) and the clamping movable block (27) move to their original positions. Step 4: After the preform is demoulded, the first electric push rod (24) pushes the moving ring (25), the second electric push rod (26) and the clamping moving block (27) again, so that the clamping moving block (27) can remove the residual material remaining on the ejector pin (7) to ensure the smoothness of the ejection action. After the removal is completed, the nozzle is accurately removed by cutting with a tool or laser cutting, so that the appearance of the preform is neat and the size meets the requirements. After the quality inspection, it is packaged and put into storage.

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