PET pre-drying material shooting table structure

Abstract

The application is suitable for the technical field of PET material injection molding equipment, and provides a PET pre-drying material injection platform structure.

Description

Technical Field

[0001] This application belongs to the technical field of PET material injection molding equipment, and in particular relates to a PET pre-baked material injection stage structure. Background Technology

[0002] PET (Polyethylene terephthalate) is a food-grade plastic material that meets national food packaging safety standards. It is very cost-effective and is therefore frequently used in production.

[0003] PET raw materials are hygroscopic and easily absorb moisture during storage and transportation. Moisture can lead to hydrolysis, reducing molecular weight and mechanical properties, and affecting key indicators such as pressure resistance and dimensional stability of plasticized products.

[0004] Therefore, existing PET raw materials need to be baked before plasticizing and molding. Baking PET takes 6-7 hours, and the high baking electricity cost makes it unprofitable for manufacturers. In order to reduce the baking time and electricity cost, various injection molding machine manufacturers have launched baking-free structures, which has alleviated the baking time of PET products to some extent.

[0005] However, when it is necessary to manufacture larger products, large injection molding machines and large screw structures are required. Most injection molding machines for PET products without preheating have a screw length-to-diameter ratio of 28:1 to 33:1 (the screw length-to-diameter ratio of general injection molding equipment is 21:1, and the screw length-to-diameter ratio of general PET injection molding equipment is 24:1). Such long screws of injection molding machines for PET products without preheating not only occupy production space, but also require the screw to bear high pressure during injection, which makes the screw prone to bending, deformation and wear. At the same time, the torque requirements of the first drive device of the screw are also large. Utility Model Content

[0006] This application provides a PET pre-baked injection stage structure, which can solve the problems of existing injection molding machines for PET products without pre-baking, where the screw has an excessively large length-to-diameter ratio, resulting in high pressure during injection, easy bending, deformation and wear, and also high torque requirements for the screw's first drive device.

[0007] This application provides a PET pre-baking injection stage structure, including a melt pre-baking mechanism, a connecting mechanism, and an injection mechanism;

[0008] The melt preheating mechanism includes a melting cylinder, a first driving device, and a screw installed inside the melting cylinder. One end of the melting cylinder has a discharge port, and the other end has a feed port. The side wall of the melting cylinder has an exhaust hole that connects the internal space of the melting cylinder to the outside. The screw is installed inside the melting cylinder, and its length direction is consistent with the length direction of the melting cylinder. The output end of the first driving device is connected to the end of the screw near the feed port, and the first driving device is used to drive the screw to rotate along the axis of the screw.

[0009] The injection mechanism includes an extrusion barrel, a second drive device, and an extrusion rod disposed inside the extrusion barrel. One end of the extrusion barrel has a discharge nozzle, and the other end of the extrusion barrel has an opening. The length direction of the extrusion rod is consistent with the length direction of the extrusion barrel. The output end of the second drive device is connected to one end of the extrusion rod. The second drive device is used to drive the extrusion rod to reciprocate linearly along the length direction of the extrusion barrel. The opening, in conjunction with the internal space of the extrusion barrel, provides a space for the extrusion rod to move.

[0010] The connecting mechanism is used to connect the outlet of the molten material cylinder and the internal space of the extrusion cylinder.

[0011] Optionally, the melting cylinder is equipped with multiple heating coils.

[0012] Optionally, the feed inlet is located on the outer wall of one end of the molten material cylinder, and the feed inlet communicates with the internal space of the molten material cylinder; the discharge outlet is located at the end of the molten material cylinder away from the feed inlet, and the discharge outlet communicates with the feed end of the connecting mechanism; the vent is located on the outer wall of the molten material cylinder and communicates with the internal space of the molten material cylinder.

[0013] Optionally, the screw has a feeding section, a compression section and a metering section sequentially from one end connected to the second drive device to the other end, and the vent is opened between the metering section and the compression section of the screw corresponding to the molten material barrel.

[0014] Optionally, an exhaust assembly is provided at the exhaust port.

[0015] Optionally, the connecting mechanism is a one-way valve, with the inlet end of the one-way valve connected to the outlet of the molten material cylinder and the outlet end of the one-way valve connected to the internal space of the extrusion cylinder.

[0016] Optionally, the melt pre-drying mechanism also includes a feeding hopper and a feeding switch. The feeding port of the feeding hopper is connected to the feeding end of the feeding switch, and the discharging end of the feeding switch is connected to the feeding port of the melting cylinder. The feeding switch can control the connection / isolation between the feeding hopper and the melting cylinder.

[0017] Optionally, the discharge switch is a discharge valve, with the inlet end of the discharge valve connected to the discharge port of the hopper and the outlet end of the discharge valve connected to the inlet.

[0018] Optionally, the first drive unit is a melt glue motor.

[0019] Optionally, the second drive unit is a hydraulic cylinder.

[0020] When the PET pre-baking injection station structure provided in this application is in use, the first drive device in the melt pre-baking mechanism is activated, causing the screw to rotate and conveying the PET raw material to the feed port of the melting cylinder. The melting process is completed in the melting cylinder. At this time, the moisture in the PET raw material will evaporate into gas and be discharged through the vent hole under the expansion of the gas. Under the propulsion of the screw, the molten and vented PET raw material enters the extrusion cylinder through the connecting mechanism. The extrusion rod is driven by the second drive device to reciprocate linearly, and the PET material is ejected through the discharge nozzle. The screw of this application only performs plasticizing and does not perform actions that require excessive thrust / extrusion force, such as injection and unloading. Therefore, the screw bears less pressure and is not easy to deform and wear. Moreover, the torque required by the first drive device of this application can also be reduced.

[0021] Other beneficial effects of this application will be described in detail in the following detailed description section. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the PET pre-drying injection stage structure provided in an embodiment of this application. Figure 1 ;

[0024] Figure 2 A schematic diagram of the PET pre-drying injection stage structure provided in an embodiment of this application. Figure 2 ;

[0025] Figure 3 This is a cross-sectional structural diagram of a PET pre-baking injection stage structure provided in an embodiment of this application.

[0026] [Explanation of Labels in the Attached Image]

[0027] 1. Melt adhesive pre-drying mechanism;

[0028] 11. Melting cylinder;

[0029] 111. Discharge port; 112. Inlet port; 113. Exhaust vent; 114. Exhaust assembly; 115. Heating coil;

[0030] 12. First driving device;

[0031] 13. Screw;

[0032] 131. Feeding section; 132. Compression section; 133. Metering section;

[0033] 14. Feed hopper; 15. Feed switch;

[0034] 2. Connecting mechanism;

[0035] 3. Injection mechanism;

[0036] 31. Extrusion cylinder;

[0037] 311. Discharge nozzle; 312. Opening;

[0038] 32. Second drive unit; 33. Extrusion rod. Detailed Implementation

[0039] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many other different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0040] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0041] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0042] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0045] It should also be noted that in the embodiments of this application, the same reference numerals are used to represent the same component or part. For the same part in the embodiments of this application, the reference numerals may only be used to mark one part or component as an example in the figure. It should be understood that the reference numerals are also applicable to other identical parts or components.

[0046] Currently, the screws of existing injection molding machines for PET products without drying materials are too long. This not only takes up production space, but also requires the screw to bear high pressure during injection, which makes the screw prone to bending, deformation and wear. At the same time, it also requires a large torque from the screw's first drive device.

[0047] To address the aforementioned problems, one embodiment of this application provides a PET pre-drying injection stage structure, such as... Figures 1 to 3As shown, the device includes a melt pre-drying mechanism 1, a connecting mechanism 2, and an injection mechanism 3. The melt pre-drying mechanism 1 includes a melt cylinder 11, a first driving device 12, and a screw 13 disposed inside the melt cylinder 11. One end of the melt cylinder 11 has a discharge port 111, and the other end has a feed port 112. The side wall of the melt cylinder 11 has a vent 113, which connects the internal space of the melt cylinder 11 to the outside. The screw 13 is disposed inside the melt cylinder 11, and the length direction of the screw 13 is consistent with the length direction of the melt cylinder 11. The output end of the first driving device 12 is connected to the end of the screw 13 near the feed port 112, and the first driving device 12 is used to drive the screw 13 along the axis of the screw 13. The rotational injection mechanism 3 includes an extrusion cylinder 31, a second drive device 32, and an extrusion rod 33 disposed inside the extrusion cylinder 31. One end of the extrusion cylinder 31 has a discharge nozzle 311, and the other end of the extrusion cylinder 31 has an opening 312. The length direction of the extrusion rod 33 is consistent with the length direction of the extrusion cylinder 31. The output end of the second drive device 32 is connected to one end of the extrusion rod 33. The second drive device 32 is used to drive the extrusion rod 33 to reciprocate linearly along the length direction of the extrusion cylinder 31. The opening 312, in conjunction with the internal space of the extrusion cylinder 31, provides a space for the extrusion rod 33 to move. The connecting mechanism 2 is used to connect the discharge port 111 of the molten material cylinder 11 and the internal space of the extrusion cylinder 31.

[0048] When the PET pre-baking injection stage structure provided in this application is in use, the first drive device 12 in the melt pre-baking mechanism 1 is activated, causing the screw 13 to rotate and convey the PET raw material to the feed port 112 of the melting cylinder 11. The melting process is completed in the melting cylinder 11. At this time, the moisture in the PET raw material will evaporate into gas and be discharged through the exhaust port 113 under the expansion of the gas. Under the propulsion of the screw 13, the molten and vented PET raw material enters the extrusion cylinder 31 through the connecting mechanism 2. The extrusion rod 33 is driven by the second drive device 32 to reciprocate linearly, and the PET material is ejected through the discharge nozzle 311. The screw 13 of this application only performs plasticization and does not perform actions such as injection and unloading that require excessive thrust / extrusion force on the screw 13. Therefore, the screw 13 bears less pressure and is not easy to deform and wear. Moreover, the torque required by the first drive device 12 of this application can also be reduced.

[0049] It is obvious that the PET pre-drying injection stage structure provided in this application, while having the above-mentioned beneficial effects, is easier and more suitable for large-scale design because the screw 13 bears low pressure and the torque required by the first drive device 12 is low. The length-to-diameter ratio of the melting barrel 11 or the screw 13 can be increased as needed to meet the design requirements. For example, in some embodiments, the length-to-diameter ratio of the melting barrel 11 is between 28:1 and 35:1.

[0050] It should be noted that the size of the opening 312 is matched with the shape and diameter of the extrusion rod 33 to prevent material leakage. A sealing ring can be set between the opening 312 and the extrusion rod 33 to further prevent material leakage. Specifically, the setting can be referred to the extrusion / injection device of the existing injection molding machine, which will not be elaborated on here.

[0051] In some embodiments of this application, such as Figures 1 to 3 As shown, the melting cylinder 11 is provided with multiple heating coils 115.

[0052] The heating coil 115 is used to heat molten PET raw materials and is designed in a ring shape to allow for a wider heating range.

[0053] In some embodiments of this application, such as Figures 1 to 3 As shown, the feed inlet 112 is located on the outer wall of one end of the molten material cylinder 11, and the feed inlet 112 is connected to the internal space of the molten material cylinder 11. The discharge outlet 111 is located at the end of the molten material cylinder 11 away from the feed inlet 112, and the discharge outlet 111 connects the internal space of the molten material cylinder 11 with the feed end of the connecting mechanism 2. The exhaust port 113 is located on the outer wall of the molten material cylinder 11 and is connected to the internal space of the molten material cylinder 11.

[0054] Since the melting cylinder 11 is often arranged horizontally during production, and the feed inlet 112 is located on the outer wall of the melting cylinder 11, it is more convenient to pour in PET raw materials. It is also convenient to place the first drive device 12 at the end of the melting cylinder 11 near the feed inlet 112. The first drive device 12 drives the screw 13 to rotate, and the added raw materials are stirred from one end of the screw 13 to the other end of the screw 13, so that the PET raw materials are thoroughly stirred and mixed evenly.

[0055] In some embodiments of this application, such as Figure 3 As shown, the screw 13 has a feeding section 131, a compression section 132 and a metering section 133 sequentially from one end connected to the second drive device 32 to the other end. The exhaust port 113 is opened between the metering section 133 and the compression section 132 of the screw 13 on the melting barrel 11.

[0056] The aforementioned vent 113 is located on the melting cylinder 11 between the metering section 133 and the compression section 132 of the screw 13. After the PET raw material is compressed by the compression section 132, it is convenient for the gas to be discharged. After the venting is completed, the PET raw material enters the metering section 133 of the screw 13 for further stirring and mixing of the melt, so as to make the PET raw material temperature uniform and free of bubbles as much as possible.

[0057] In some embodiments of this application, such as Figure 2 As shown, an exhaust assembly 114 is provided at the exhaust port 113.

[0058] The exhaust assembly 114 is used to facilitate gas discharge. Specifically, the exhaust assembly 114 can be a vacuum adsorption component or an existing exhaust assembly 114, which can be set according to the existing technology as needed, so it will not be described in detail here.

[0059] In some embodiments of this application, the connecting mechanism is a one-way valve, with the inlet end of the one-way valve connected to the outlet of the molten material cylinder and the outlet end of the one-way valve connected to the internal space of the extrusion cylinder.

[0060] The aforementioned one-way valve is used to prevent backflow of PET raw materials when they enter the extrusion cylinder from the melting cylinder, thus avoiding the overflow of PET raw materials that have already entered the extrusion cylinder back into the melting cylinder.

[0061] In some embodiments of this application, such as Figures 1 to 3 As shown, the melt pre-drying mechanism 1 also includes a hopper 14 and a discharge switch 15. The discharge port of the hopper 14 is connected to the feed end of the discharge switch 15, and the discharge end of the discharge switch 15 is connected to the feed port 112 of the melting cylinder 11. The discharge switch 15 can control the connection / isolation between the hopper 14 and the melting cylinder 11.

[0062] The aforementioned hopper 14 facilitates the addition of raw materials and is equipped with a discharge switch 15, which can discharge materials when needed.

[0063] In some embodiments of this application, the discharge switch is a discharge valve, the inlet end of which is connected to the discharge port of the hopper, and the outlet end of which is connected to the inlet.

[0064] The aforementioned discharge valve can control the connection / isolation between the discharge hopper and the molten material cylinder. By opening / closing the discharge valve as needed, the connection / isolation between the discharge hopper and the molten material cylinder can be switched, thereby discharging / stopping the discharge.

[0065] In some embodiments of this application, the first driving device is a melt glue motor.

[0066] The aforementioned melt glue motor is used to drive the screw to rotate. It is understood that the aforementioned melt glue motor can also be other devices such as motors that can drive the screw to rotate.

[0067] It should be noted that in some embodiments, the drive end of the sol motor is electrically connected to an external power source, and in other embodiments, the PET pre-drying injection stage structure provided in this application is also provided with a power source, and the drive end of the sol motor is electrically connected to the power source.

[0068] In some embodiments of this application, the second driving device is a hydraulic cylinder.

[0069] The aforementioned hydraulic cylinder is used to drive the extrusion rod to perform linear reciprocating motion along the length of the extrusion cylinder, so as to extrude the PET raw material and eject it through the discharge nozzle. It is understood that the aforementioned second drive device can also be a cylinder or other device that can drive the extrusion rod to perform reciprocating linear motion.

[0070] It should be noted that the above-mentioned discharge nozzle can be connected with other production components to complete the product manufacturing. For example, the PET pre-baking material injection station structure provided in this application is used as the injection mechanism of an injection molding machine to melt and inject the raw material. After injection, the mold is closed by the mold closing device of the injection molding machine to complete the product manufacturing.

[0071] The above description is the preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principles described in this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A PET pre-drying material injection stage structure, characterized in that, It includes a melt preheating mechanism (1), a connecting mechanism (2), and an injection mechanism (3); The melt pre-drying mechanism (1) includes a melting cylinder (11), a first driving device (12), and a screw (13) disposed inside the melting cylinder (11). One end of the melting cylinder (11) has a discharge port (111), and the other end of the melting cylinder (11) has a feed port (112). The side wall of the melting cylinder (11) has an exhaust hole (113), which connects the internal space of the melting cylinder (11) to the outside. The screw (13) is disposed inside the melting cylinder (11), and the length direction of the screw (13) is consistent with the length direction of the melting cylinder (11). The output end of the first driving device (12) is connected to the end of the screw (13) near the feed port (112), and the first driving device (12) is used to drive the screw (13) to rotate along the axis of the screw (13). The injection mechanism (3) includes an extrusion cylinder (31), a second drive device (32), and an extrusion rod (33) disposed inside the extrusion cylinder (31). One end of the extrusion cylinder (31) has a discharge nozzle (311), and the other end of the extrusion cylinder (31) has an opening (312). The length direction of the extrusion rod (33) is consistent with the length direction of the extrusion cylinder (31). The output end of the second drive device (32) is connected to one end of the extrusion rod (33). The second drive device (32) is used to drive the extrusion rod (33) to reciprocate linearly along the length direction of the extrusion cylinder (31). The opening (312) cooperates with the internal space of the extrusion cylinder (31) to provide a space for the extrusion rod (33) to move. The connecting mechanism (2) is used to connect the outlet (111) of the melting cylinder (11) and the internal space of the extrusion cylinder (31).

2. The PET pre-baking injection stage structure according to claim 1, characterized in that, The melting cylinder (11) is provided with multiple heating coils (115).

3. The PET pre-baking injection stage structure according to claim 1, characterized in that, The feed inlet (112) is located on the outer wall of one end of the molten material cylinder (11), and the feed inlet (112) communicates with the internal space of the molten material cylinder (11). The discharge outlet (111) is located at the end of the molten material cylinder (11) away from the feed inlet (112), and the discharge outlet (111) communicates the internal space of the molten material cylinder (11) with the feed end of the connecting mechanism (2). The exhaust port (113) is located on the outer wall of the molten material cylinder (11) and communicates with the internal space of the molten material cylinder (11).

4. The PET pre-drying injection stage structure according to claim 1, characterized in that, The screw (13) has a feeding section (131), a compression section (132) and a metering section (133) sequentially from one end connected to the second drive device (32) to the other end. The vent (113) is opened between the metering section (133) and the compression section (132) of the screw (13) on the melting cylinder (11).

5. The PET pre-baking injection stage structure according to claim 1, characterized in that, An exhaust assembly (114) is provided at the exhaust port (113).

6. The PET pre-baking injection stage structure according to claim 1, characterized in that, The connecting mechanism (2) is a one-way valve. The feed end of the one-way valve is connected to the discharge port (111) of the melting cylinder (11), and the discharge end of the one-way valve is connected to the internal space of the extrusion cylinder (31).

7. The PET pre-baking injection stage structure according to claim 1, characterized in that, The melt pre-drying mechanism (1) further includes a feeding hopper (14) and a feeding switch (15). The feeding port of the feeding hopper (14) is connected to the feeding end of the feeding switch (15), and the discharging end of the feeding switch (15) is connected to the feeding port (112) of the melting cylinder (11). The feeding switch (15) can control the connection / isolation between the feeding hopper (14) and the melting cylinder (11).

8. The PET pre-drying injection stage structure according to claim 7, characterized in that, The discharge switch (15) is a discharge valve. The inlet end of the discharge valve is connected to the discharge port of the discharge hopper (14), and the outlet end of the discharge valve is connected to the inlet (112).

9. The PET pre-baking injection stage structure according to claim 1, characterized in that, The first driving device (12) is a melt glue motor.

10. The PET pre-baking injection stage structure according to claim 1, characterized in that, The second drive device (32) is a hydraulic cylinder.

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