Extrusion mechanism and film blowing machine

Abstract

This invention discloses an extrusion mechanism and a blown film machine. The extrusion mechanism includes a stator and a rotor. The stator has an inner cavity and a feed inlet and a discharge outlet respectively communicating with the inner cavity. The rotor is disposed in the inner cavity and surrounds the stator to form an extrusion chamber. The rotor is used for driving connection with a drive assembly. The rotor includes a feeding section, a conveying and compression section, at least one mixing section, and a metering section connected in sequence. Adjacent mixing sections are connected by a conveying section. The feeding section communicates with the feed inlet, and the metering section communicates with the discharge outlet. This invention improves the structure of the extrusion mechanism, enhances its material mixing, dispersion, and homogenization capabilities, and improves the mechanical properties of the film.

Description

Technical Field

[0001] This invention relates to the field of film blowing equipment technology, and more particularly to an extrusion mechanism and a blown film machine. Background Technology

[0002] Agricultural film is a high-yield cultivation technique that effectively increases crop yields and is widely used in agricultural production, playing a significant role in increasing crop production. The manufacturing process of agricultural film requires the use of a blown film machine.

[0003] Currently, blown film machines include an extrusion mechanism, a traction mechanism, and a winding mechanism. The extrusion mechanism heats the raw material into a molten state and extrudes it, using compressed air to blow out film bubbles to produce a thin film. Then, the traction mechanism conveys the film to the winding mechanism, which winds the film into a roll.

[0004] However, the existing blown film extrusion mechanism has poor material mixing capacity, uneven material heating, uneven film thickness, and poor mechanical properties. Summary of the Invention

[0005] The main objective of this invention is to provide an extrusion mechanism and a blown film machine, which aims to improve the material mixing, dispersion and heat equalization capabilities of the extrusion mechanism, improve the uniformity of film thickness, and enhance the mechanical properties of the film.

[0006] To achieve the above objectives, the present invention provides an extrusion mechanism, comprising:

[0007] The stator has an inner cavity and an inlet and an outlet respectively communicating with the inner cavity; and

[0008] The rotor is disposed in the inner cavity and surrounds the stator to form an extrusion cavity. The rotor is used to drive the connection with the drive assembly. The rotor includes a feeding section, a conveying and compression section, at least one mixing section and a metering section connected in sequence. Two adjacent mixing sections are connected by a conveying section. The feeding section is connected to the feed port and the metering section is connected to the discharge port.

[0009] Optionally, the rotor includes a rotor body, and the mixing section includes multiple bosses, which are arranged in an array on the peripheral wall of the rotor body.

[0010] Optionally, the boss is in the shape of a cuboid, cylinder, or rhombus.

[0011] Optionally, the conveying compression section is arranged in a spiral shape, and the conveying section is the same as the conveying compression section.

[0012] To achieve the above objectives, the present invention also provides a blown film machine, the blown film machine comprising:

[0013] Base;

[0014] An extrusion apparatus, comprising a barrel, an extrusion mechanism as described above, a drive assembly, a die, and a cooling assembly. The barrel is mounted on a base and has a mounting cavity and a communication port communicating with the mounting cavity. The extrusion mechanism is disposed within the mounting cavity of the barrel. The drive assembly is drivenly connected to the rotor of the extrusion mechanism. The die is mounted on the barrel, and the feed end of the die communicates with the discharge port of the extrusion mechanism. The drive assembly is used to drive the rotor of the extrusion mechanism to rotate, extruding material into the die to blown a film. The extrusion mechanism includes:

[0015] The stator has an inner cavity and an inlet and an outlet respectively communicating with the inner cavity; and

[0016] The rotor is disposed in the inner cavity and surrounds the stator to form an extrusion cavity. The rotor is used to drive the connection with the drive assembly. The rotor includes a feeding section, a conveying and compression section, at least one mixing section and a metering section connected in sequence. Two adjacent mixing sections are connected by a conveying section. The feeding section is connected to the feed port. The metering section is connected to the discharge port.

[0017] The cooling assembly includes a controller, a temperature sensor, and a fan, all of which are signal-connected to the controller. The temperature sensor is mounted on the barrel and the die head to detect the temperature of the extrusion chamber and output a temperature signal to the controller. The air outlet of the fan is connected to the communication port. The controller is used to control the operation of the fan according to the temperature signal.

[0018] A traction mechanism, disposed above the die head, is used to traction the film from the blowing end of the die head to the unloading position; and

[0019] A winding mechanism is disposed on one side of the die head and located at the unloading position for winding the film.

[0020] Optionally, the extrusion mechanism further includes a heating and cooling assembly disposed on the outer surface of the barrel for heating or cooling the material; the heating and cooling assembly is signal-connected to the controller, which is also used to control the operation of the heating and cooling assembly.

[0021] Optionally, the heating and cooling assembly includes at least one heating element and a cooling channel; the temperature sensor is a thermistor.

[0022] Optionally, the drive assembly includes a motor and a coupling, the motor being driven to the extrusion mechanism via the coupling.

[0023] Optionally, the extrusion mechanism further includes an alarm, which is signal-connected to the controller to output high temperature, high pressure, and overload alarm signals under the control of the controller.

[0024] Optionally, the winding mechanism includes a winding base, a driving component, and a winding shaft, wherein the winding shaft is rotatably mounted on the winding base and drivenly connected to the driving component.

[0025] In the technical solution of this invention, the extrusion mechanism includes a stator and a rotor. The stator has an inner cavity and a feed inlet and a discharge outlet respectively communicating with the inner cavity. The rotor is disposed in the inner cavity and surrounds the stator to form an extrusion chamber. The rotor is used for driving connection with the drive assembly. The rotor includes a feeding section, a conveying and compression section, at least one mixing section, and a metering section connected in sequence. Adjacent mixing sections are connected by a conveying section. The feeding section communicates with the feed inlet, and the metering section communicates with the discharge outlet. During the extrusion process, the raw material enters the extrusion chamber from the feed inlet and is initially mixed in the feeding section. Then, the conveying and compression section further mixes, compresses, melts, and compacts the material before conveying it to the mixing section. The mixing section mixes, homogenizes, and disperses the flowing material. Then, the output pressure is established through the metering section and the material is output through the discharge outlet. In this way, the material mixing, dispersion, and homogenization capabilities of the extrusion mechanism are improved, the uniformity of the film thickness is improved, and the mechanical properties of the film are enhanced. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, 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 the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of an embodiment of the extrusion mechanism of the present invention;

[0028] Figure 2 This is an exploded view of an embodiment of the extrusion mechanism of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of an embodiment of the blown film machine of the present invention;

[0030] Figure 4 This is a schematic diagram of the blown film machine of the present invention from another perspective;

[0031] Figure 5 This is a front view of an embodiment of the blown film machine of the present invention;

[0032] Figure 6 This is a structural diagram of the control system in one embodiment of the blown film machine of the present invention.

[0033] Explanation of icon numbers:

[0034] 1. Stator; 2. Rotor; 1a. Feed inlet; 1b. Discharge outlet; 1c. Inner cavity; 201. Feeding section; 202. Conveying and compressing section; 203. Mixing section; 205. Metering section; 204. Conveying section; 10. Machine base; 20. Extrusion device; 30. Traction mechanism; 40. Winding mechanism; 21. Barrel; 22. Drive assembly; 23. Die head; 24. Cooling assembly; 241. Controller; 242. Temperature sensor; 243. Fan; 25. Heating and cooling assembly; 221. Motor; 222. Coupling; 244. Alarm; 41. Winding holder; 42. Drive component; 43. Winding shaft.

[0035] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0037] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0038] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0039] This invention proposes an extrusion mechanism applicable to blown film machines, but not limited to this.

[0040] refer to Figure 1 and Figure 2 In one embodiment of the present invention, the extrusion mechanism includes a stator 1 and a rotor 2. The stator 1 has an inner cavity 1c and a feed port 1a and a discharge port 1b respectively communicating with the inner cavity 1c. The rotor 2 is disposed in the inner cavity 1c and surrounds the stator 1 to form an extrusion cavity. The rotor 2 is used to drive the connection with the drive assembly. The rotor 2 includes a feed section 201, a conveying and compression section 202, at least one mixing section 203 and a metering section 205 connected in sequence. Two adjacent mixing sections 203 are connected by a conveying section 204. The feed section 201 is connected to the feed port 1a and the metering section 205 is connected to the discharge port 1b.

[0041] In this embodiment, the stator 1 can be cylindrical, and the shape of its inner cavity 1c can be adapted to the shape of the rotor 2. Specifically, the cavity shape of the inner cavity 1c of the stator 1 corresponding to the feeding section 201, the conveying and compression section 202, the conveying section 204, and the metering section 205 can be an internally threaded hole, and the dimensions of each section can be set differently. The cavity shape of the inner cavity 1c of the stator 1 corresponding to the mixing section 203 can be a circular through hole, so as to cooperate with the rotor 2 to achieve better mixing, heating, and dispersion effects.

[0042] In this embodiment, the conveying compression section 202, the conveying section 204, and the metering section 205 can all be arranged in a spiral shape, and the structure of the conveying section 204 and the conveying compression section 202 can be set to be the same. The pitch and other parameters of the metering section 205 determine the extrusion amount. Through reasonable structural design, the extrusion pressure can be established, thereby improving the quality of the film.

[0043] It should be noted that the number of mixing sections 203 can vary depending on the characteristics of the material, and is not limited here. Since the mixing section 203 itself does not have the ability to convey material forward, but can only change the relative position of the material in the height direction in the extrusion chamber, the material flow can be accelerated by setting a spiral conveying section 204 between two adjacent mixing sections 203.

[0044] In the technical solution of the present invention, the extrusion mechanism includes a stator 1 and a rotor 2. The stator 1 is provided with an inner cavity 1c and a feed port 1a and a discharge port 1b respectively communicating with the inner cavity 1c. The rotor 2 is disposed in the inner cavity 1c and surrounds the stator 1 to form an extrusion cavity. The rotor 2 is used to drive the connection with the drive assembly. The rotor 2 includes a feed section 201, a conveying and compression section 202, at least one mixing section 203 and a metering section 205 connected in sequence. Two adjacent mixing sections 203 are connected by a conveying section 204. The feed section 201 is connected to the feed port 1a and the metering section 205 is connected to the discharge port 1b. During the extrusion process, the raw material enters the extrusion chamber through the feed inlet 1a and is initially mixed in the feed section 201. Then, the material is further mixed, compressed, melted, and compacted by the conveying and compression section 202 and conveyed to the mixing section 203. The mixing section 203 mixes, heats, and disperses the flowing material. Then, the output pressure is established through the metering section 205 and output through the discharge port 1b. In this way, the material mixing, heats, and disperses the extrusion mechanism, improves the uniformity of film thickness, and thus enhances the mechanical properties of the film.

[0045] refer to Figure 2 In one embodiment, the rotor 2 includes a rotor body, and the mixing section 203 includes a plurality of bosses, which are arranged in an array on the peripheral wall of the rotor body.

[0046] It is understandable that when the material passes through the mixing section 203, the uneven protrusions continuously change the height position of the extrusion cavity, allowing it to be fully mixed, heated evenly, and dispersed, thereby making the blown film thickness more uniform and the mechanical properties more stable.

[0047] In this embodiment, the boss can be in the shape of a cuboid, cylinder, or rhombus, or it can be a combination of two or more shapes. Different materials can use bosses of different shapes and sizes, which are not specifically limited here.

[0048] The present invention also proposes a blown film machine suitable for manufacturing various plastic films, especially agricultural mulch films, which are not limited here.

[0049] Reference Figures 3 to 6In one embodiment of the present invention, the blown film machine includes a base 10, an extrusion device 20, a traction mechanism 30, and a winding mechanism 40. The extrusion device 20 includes a barrel 21, an extrusion mechanism as described above, a drive assembly 22, a die 23, and a cooling assembly 24. The barrel 21 is mounted on the base 10 and has a mounting cavity and a communication port communicating with the mounting cavity. The extrusion mechanism is mounted in the mounting cavity of the barrel 21. The drive assembly 22 is drivenly connected to the rotor 2 of the extrusion mechanism. The die 23 is mounted on the barrel 21 and its feed end is connected to the extrusion cavity. The drive assembly 22 is used to drive the rotor 2 of the extrusion mechanism to rotate and extrude the material to the die 23 to blow a film. The cooling assembly 24 includes a controller 241 and a temperature sensor 242 and a fan 243 respectively connected to the controller 241. The temperature sensor 242 is mounted on the barrel 21 and the die 23 to detect the temperature of the extrusion cavity and output a temperature signal to the controller 241. The air outlet of the fan 243 is connected to the communication port. The controller 241 is used to control the operation of the fan 243 according to the temperature signal. A traction mechanism 30 is positioned above the die head 23 to traction the film from the blowing end of the die head 23 to the unloading position. A winding mechanism 40 is positioned on one side of the die head 23 at the unloading position to wind up the film.

[0050] Main reference Figure 4 In this embodiment, the traction mechanism 30 may include components such as a traction frame, multiple traction rollers, and a traction motor. The multiple traction rollers are spaced apart on the traction frame, and the traction rollers are driven by the traction motor.

[0051] Main reference Figure 4 In this embodiment, the winding mechanism 40 may include a winding base 41, a driving member 42, and a winding shaft 43. The winding shaft 43 is rotatably mounted on the winding base 41 and drivenly connected to the driving member 42. The driving member 42 may be a cylinder or a motor 221, and the winding shaft 43 may be an air shaft, etc., which are not limited here.

[0052] Please refer to Figure 6 In this embodiment, the controller 241 can also be connected to the drive component 22 via a signal connection to control the operation of the drive component 22. The controller 241 can be an electronic device such as a microcontroller, DSP, or FPGA, and is not limited here.

[0053] In this embodiment, the temperature sensor 242 can preferably be a thermistor.

[0054] A thermistor is a type of sensor resistor whose resistance changes with temperature. Based on their temperature coefficient, they are classified into positive temperature coefficient thermistors (PTC thermistors) and negative temperature coefficient thermistors (NTC thermistors). The resistance of a PTC thermistor increases with increasing temperature, while the resistance of an NTC thermistor decreases with increasing temperature; both are semiconductor devices.

[0055] In the technical solution of the present invention, the blown film machine includes a base 10, an extrusion device 20, a traction mechanism 30, and a winding mechanism 40. The extrusion device 20 includes a barrel 21, an extrusion mechanism as described above, a drive assembly 22, a die 23, and a cooling assembly 24. The barrel 21 is mounted on the base 10 and has a mounting cavity and a communication port communicating with the mounting cavity. The extrusion mechanism is mounted in the mounting cavity of the barrel 21. The drive assembly 22 is drivenly connected to the rotor 2 of the extrusion mechanism. The die 23 is mounted on the barrel 21 and its feed end is connected to the extrusion cavity. The drive assembly 22 is used to drive the rotor 2 of the extrusion mechanism to rotate and extrude the material to the die 23 to blow a film. The cooling assembly 24 includes a controller 241 and a temperature sensor 242 and a fan 243 that are respectively signal-connected to the controller 241. The temperature sensor 242 is mounted on the barrel 21 to detect the temperature of the extrusion cavity and output a temperature signal to the controller 241. The air outlet of the fan 243 is connected to the communication port. The controller 241 is used to control the operation of the fan 243 according to the temperature signal. A traction mechanism 30 is positioned above the die head 23 to traction the film from the blowing end of the die head 23 to the unloading position. A winding mechanism 40, positioned on one side of the die head 23 and at the unloading position, is used to wind the film. It can be understood that by incorporating a blower 243 into the extrusion device 20, with the blower 243 connected to the extrusion chamber, and a temperature sensor 242 monitoring the temperature of the extrusion chamber in real time and feeding it back to the controller 241, the controller 241 controls the blower 243 to deliver cold air into the extrusion chamber to lower the temperature to the target temperature. This improves the temperature control capability of the blown film machine, enhances the accuracy of temperature control, improves the uniformity of film thickness, and thus improves the film's performance.

[0056] To further improve the temperature control capability of this blow molding machine, the main references are... Figure 6 In one embodiment, the extrusion apparatus 20 may further include a heating and cooling assembly 25 disposed on the outer surface of the barrel 21 for heating or cooling the material; the heating and cooling assembly 25 is signal-connected to the controller 241, which is also used to control the operation of the heating and cooling assembly 25.

[0057] In this embodiment, the heating and cooling assembly 25 may include at least one heating tube and a cooling channel to improve the heating and cooling effect and enhance the mechanical properties of the film.

[0058] To improve the stability of the extrusion mechanism's rotation, thereby enhancing extrusion efficiency and quality, refer to... Figure 5 In one embodiment, the drive assembly 22 may include a motor 221 and a coupling 222, wherein the motor 221 is driven to the extrusion mechanism via the coupling 222.

[0059] To further improve heat dissipation, in one embodiment, a flow guide is installed at the connection port to accelerate airflow.

[0060] In this embodiment, the flow guide can be one or more flow guide plates disposed at the connecting port. The flow guide plate forms a flow guide channel that gradually reduces the inner diameter of the air duct. That is, the size of the flow guide channel gradually decreases from the connecting port toward the extrusion chamber.

[0061] To improve the safety of this blown film machine and ensure that the processed film thickness is within the required range, thereby increasing the yield of film manufacturing, reference is made. Figure 6 In one embodiment, the extrusion device 20 may further include an alarm 244, which is signal-connected to the controller 241 to output high temperature, high pressure, and overload alarm signals under the control of the controller 241.

[0062] In this embodiment, the alarm 244 can be a buzzer, signal light, or display screen, etc., and is not limited here.

[0063] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An extrusion mechanism, characterized in that, include: The stator has an inner cavity and a feed inlet and a discharge outlet respectively communicating with the inner cavity; as well as The rotor is disposed in the inner cavity and surrounds the stator to form an extrusion cavity. The rotor is used for driving connection with the drive assembly. The rotor includes a feeding section, a conveying and compression section, at least one mixing section and a metering section connected in sequence. Two adjacent mixing sections are connected by a conveying section. The feeding section is connected to the feed port and the metering section is connected to the discharge port. The rotor includes a rotor body. The mixing section includes multiple bosses. The multiple bosses are arranged in an array on the peripheral wall of the rotor body. The bosses are cuboid, cylindrical or rhomboid in shape. The feeding section is used for preliminary mixing of raw materials, the conveying and compression section is used for further mixing, compressing, melting, and compacting the materials and conveying them to the mixing section. The mixing section itself does not have the ability to convey materials forward, but is only used to change the relative position of the materials in the height direction in the extrusion chamber to mix, heat and disperse the flowing materials. The metering section is used to establish the output pressure.

2. The extrusion mechanism as described in claim 1, characterized in that, The conveying and compression section is arranged in a spiral shape, and the conveying section is the same as the conveying and compression section.

3. A blown film machine, characterized in that, The blown film machine includes: Base; An extrusion apparatus, comprising a barrel, an extrusion mechanism as described in claim 1 or 2, a drive assembly, a die, and a first cooling assembly; the barrel is disposed on a base and has a mounting cavity and a communication port communicating with the mounting cavity; the extrusion mechanism is disposed within the mounting cavity of the barrel; the drive assembly is drivenly connected to the rotor of the extrusion mechanism; the die is disposed on the barrel and the feed end of the die communicates with the discharge port of the extrusion mechanism; the drive assembly is used to drive the rotor of the extrusion mechanism to rotate and extrude material to the die to blow a film. The first cooling assembly includes a controller, a temperature sensor and a fan respectively connected to the controller by signal. The temperature sensor is installed on the barrel and the die head to detect the temperature of the extrusion cavity and output a temperature signal to the controller. The air outlet of the fan is connected to the communication port. The controller is used to control the operation of the fan according to the temperature signal. A traction mechanism, disposed above the die head, is used to traction the film from the blowing end of the die head to the unloading position; and A winding mechanism is disposed on one side of the die head and located at the unloading position for winding the film.

4. The blown film machine as described in claim 3, characterized in that, The extrusion apparatus further includes a heating and cooling assembly disposed on the outer surface of the barrel for heating or cooling the material; the heating and cooling assembly is signal-connected to the controller, which is also used to control the operation of the heating and cooling assembly.

5. The blown film machine as described in claim 4, characterized in that, The heating and cooling assembly includes at least one heating element and a cooling channel; the temperature sensor is a thermistor.

6. The blown film machine as described in claim 3, characterized in that, The drive assembly includes a motor and a coupling, with the motor being driven to the extrusion mechanism via the coupling.

7. The blown film machine as described in claim 3, characterized in that, The extrusion mechanism also includes an alarm, which is signal-connected to the controller to output high temperature, high pressure, and overload alarm signals under the control of the controller.

8. The blown film machine according to any one of claims 3 to 7, characterized in that, The winding mechanism includes a winding base, a driving component, and a winding shaft. The winding shaft is rotatably mounted on the winding base and drivenly connected to the driving component.

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