Double-screw extruder for PVC (polyvinyl chloride) production

Abstract

The utility model discloses a double-screw extruder for PVC (Polyvinyl Chloride) production, which belongs to the technical field of high polymer material processing equipment and comprises a rack, a driving mechanism, a double-screw structure, a charging barrel structure, a feeding funnel structure, a machine head structure, a multi-section temperature control structure and an electric control module, a driving mechanism is arranged on one side of the rack and is in driving connection with the double-screw structure; the double-screw structure is movably arranged in the charging barrel structure, and the charging barrel structure is arranged on the rack; the feeding funnel structure is arranged above one end of the charging barrel structure, and the machine head structure is arranged at the other end of the charging barrel structure relative to the feeding funnel structure; the multi-section temperature control structure is arranged between the feeding funnel structure and the machine head structure and is connected with the charging barrel structure; the electric control module is in control connection with the driving mechanism and the multi-section temperature control structure. According to the utility model, the technical problem of how to improve the convenience of temperature control of different sections of the charging barrel of the double-screw extruder is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of polymer material processing equipment, in particular to a twin-screw extruder for PVC production. Background Art

[0002] Polymer materials, also known as polymers, are a class of materials composed of long chains of molecules. These molecules are composed of a large number of repeating units, or monomers, linked by covalent bonds to form a macromolecular chain or network structure. PVC, or polyvinyl chloride, is a widely used synthetic polymer. It is formed by the polymerization of vinyl chloride monomer (CH2=CHCl) with the help of an initiator. It possesses excellent chemical resistance, electrical insulation, and a certain degree of mechanical strength. PVC is known as a "global material" due to its low cost, mature production process, and widespread application.

[0003] Twin-screw extruders are among the most commonly used equipment for processing polymer materials. They use two rotating screws to melt and mix solid materials, ultimately forming continuous products such as plastic films, tubes, or profiles. Typically, the process is as follows: solid material is first fed into the twin-screw extruder's hopper. The screws are then controlled to rotate, drawing the material into the extruder's barrel. Within the barrel, the material is heated or cooled, melting or solidifying depending on its properties. After the material passes a certain distance between the screws, mixing and shearing occur, breaking and recombining the bonds between the molecules to form a homogeneous mixture. Continuous outward pressure is then applied to extrude the material to the extruder's outlet. The final product shape is determined by the die.

[0004] Based on this, Chinese invention patent publication number CN104309095A discloses a twin-screw extruder comprising a barrel and two screw units, both of which are located within the barrel. A section of the two screw units meshes to form an intermeshing section, and the end of the intermeshing section is a discharge port. The barrel is divided into two independent, continuous flow channels, which are arranged in sequence along the screw unit conveying direction. The two screw units in the independent and intermeshing sections are both non-intermeshing, and each of the two screw units in the independent and intermeshing sections is located within the flow channel. A heater is provided throughout the barrel, and a filler is provided on the intermeshing section. The technical solution disclosed in this patent is that the independent and intermeshing sections are equivalent to two separate single screws. The molten material in the screw groove has a good sealing effect, preventing the loss of gas and supercritical fluid added thereto. The intermeshing section has a good dispersion and mixing effect on the material, making it suitable for polymer melt foaming processing.

[0005] However, the twin-screw extruder disclosed above still suffers from the technical problem of being unable to control the barrel temperature in sections. Specifically, in the technical solutions disclosed in the prior art, the two screw units in the independent section and the filling section are each located in two independent, through-flow channels of the barrel, equivalent to two separate single screws. The heaters in the independent sections heat the material to a molten state. This means that to control the melting temperature of the material inside the barrel, the temperature within the independent sections must be raised or lowered as a whole; it is impossible to individually control the melt temperature within a specific section. During the extrusion process of PVC particles, the temperature directly affects the plastic's melt state, flow properties, and the quality of the final product. Excessively high or low extrusion temperatures can cause problems such as bubbles, deformation, and cracking in the profile, and even reduce the life of the mold. Therefore, precise control of extrusion temperature is crucial to ensuring product quality and production efficiency. Different types of PVC have different melting temperature ranges and thermal properties. Therefore, it is necessary to set different temperature ranges for specific material types so that different sections of the extruder can be controlled to achieve different temperature ranges. Utility Model Content

[0006] Based on this, it is necessary to provide a twin-screw extruder for PVC production to address the technical problem of how to improve the convenience of temperature control of different sections of the barrel of a twin-screw extruder.

[0007] A twin-screw extruder for PVC production, comprising: a frame, a drive mechanism, a twin-screw structure, a barrel structure, a feeding funnel structure, a head structure, a multi-stage temperature control structure and an electronic control module; the drive mechanism is arranged on one side of the frame, and the drive mechanism is driven and connected to the twin-screw structure; the twin-screw structure is movably arranged in the barrel structure, and the barrel structure is arranged on the frame; the feeding funnel structure is arranged on one end of the barrel structure, and the head structure is arranged at the other end of the barrel structure relative to the feeding funnel structure; the multi-stage temperature control structure is arranged between the feeding funnel structure and the head structure, and the multi-stage temperature control structure is connected to the barrel structure; the electronic control module is arranged on the side of the frame, and the electronic control module is respectively controlled and connected to the drive mechanism and the multi-stage temperature control structure.

[0008] Furthermore, the driving mechanism comprises a motor swing frame, a driving motor, a power output wheel, a transmission belt structure, a power input wheel, a reducer structure and a coupling structure.

[0009] Furthermore, the motor swing frame is movably arranged in the frame, and the drive motor is connected to the motor swing frame; the drive motor is drivingly connected to the power output wheel, and the transmission belt structure is respectively connected to the power output wheel and the power input wheel; the power input wheel is connected to the reducer structure; and the coupling structure is respectively connected to the reducer structure and the twin-screw structure.

[0010] Furthermore, the barrel structure comprises a barrel body and a plurality of barrel support seats.

[0011] Furthermore, the barrel body is arranged above the frame between the head structure and the coupling structure; the twin-screw structure is movably arranged in the barrel body, and the feeding funnel structure is connected to the barrel body; a plurality of barrel support seats are evenly spaced and arranged on the frame, and each barrel support seat is connected to the barrel body.

[0012] Furthermore, the head structure includes a head body, a head temperature control structure and an extrusion die structure.

[0013] Furthermore, the head body is connected to one end of the barrel body, the head temperature control structure is connected to the head body, and the head temperature control structure is electrically connected to the electronic control module; the extrusion mold structure is arranged at the other end of the head body relative to the barrel body.

[0014] Furthermore, the multi-stage temperature control structure has a temperature control blower, an air hood structure, an air duct connection seat and a plurality of air supply ducts.

[0015] Furthermore, a plurality of the temperature-controlled blowers are distributed in the rack, and the electric control module is respectively connected to each of the temperature-controlled blowers for control.

[0016] Furthermore, several of the air hood structures are evenly distributed between the feeding funnel structure and the machine head structure, and each of the air hood structures is covered around the barrel body; the bottom of each of the air hood structures is correspondingly connected to an air duct connecting seat, and each of the air supply ducts is correspondingly connected to an air duct connecting seat and a temperature-controlled blower.

[0017] To sum up, the twin-screw extruder for PVC production of the present invention is respectively provided with a frame, a driving mechanism, a twin-screw structure, a barrel structure, a feeding funnel structure, a head structure, a multi-stage temperature control structure and an electronic control module; the driving mechanism is arranged on one side of the frame, and the driving mechanism is connected to the twin-screw structure; the twin-screw structure is movably arranged in the barrel structure, and the barrel structure is arranged on the frame; the feeding funnel structure is arranged on one end of the barrel structure, and the head structure is arranged at the other end of the barrel structure relative to the feeding funnel structure; the multi-stage temperature control structure is arranged between the feeding funnel structure and the head structure, and the multi-stage temperature control structure is connected to the barrel structure; the electronic control module is arranged on the side of the frame, and the electronic control module is respectively controlled and connected with the driving mechanism and the multi-stage temperature control structure. The multi-stage temperature control structure divides the barrel structure into multiple temperature control sections, allowing different sections to have different temperatures. This prevents problems such as bubbles, deformation, and cracking in the PVC products produced by the barrel structure, thereby ensuring product quality and production efficiency. Therefore, the twin-screw extruder for PVC production of the utility model solves the technical problem of how to improve the convenience of temperature control of different sections of the barrel of a twin-screw extruder. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a twin-screw extruder for PVC production according to the present utility model;

[0019] Figure 2 This is a schematic diagram of the exploded structure of the other side of the structure of the twin-screw extruder for PVC production of the utility model;

[0020] Figure 3 This is a schematic diagram of the exploded structure of the other side of the structure of the twin-screw extruder for PVC production of the utility model. DETAILED DESCRIPTION

[0021] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0023] 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 the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0024] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0025] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0026] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0027] Please also refer to Figures 1 to 3 The utility model discloses a twin-screw extruder for PVC production, comprising: a frame 1, a driving mechanism 2, a twin-screw structure 3, a barrel structure 4, a feeding funnel structure 5, a head structure 6, a multi-stage temperature control structure 7 and an electronic control module 8; the driving mechanism 2 is arranged on one side of the frame 1, and the driving mechanism 2 is connected to the twin-screw structure 3; the twin-screw structure 3 is movably arranged in the barrel structure 4, and the barrel structure 4 is arranged on the frame 1; the feeding funnel structure 5 is arranged on one end of the barrel structure 4, and the head structure 6 is arranged at the other end of the barrel structure 4 relative to the feeding funnel structure 5; the multi-stage temperature control structure 7 is arranged between the feeding funnel structure 5 and the head structure 6, and the multi-stage temperature control structure 7 is connected to the barrel structure 4; the electronic control module 8 is arranged on the side of the frame 1, and the electronic control module 8 is respectively controlled and connected with the driving mechanism 2 and the multi-stage temperature control structure 7.

[0028] Specifically, when the twin-screw extruder for PVC production is in operation, the user places the PVC material to be extruded into the feed hopper structure 5 and activates the drive mechanism 2 and the multi-stage temperature control structure 7 via the electronic control module 8. The drive mechanism 2 then activates the twin-screw structure 3, moving the material from the feed hopper structure 5 into the barrel structure 4, where it is guided by the twin-screw structure 3. The multi-stage temperature control structure 7 is connected to different sections of the barrel structure 4, thereby maintaining different temperatures in different parts of the barrel structure 4. Consequently, after the material passes between the screws for a certain distance, it is mixed and sheared, breaking and recombining the bonds between the molecules, forming a uniform mixture. Simultaneously, the electronic control module 8 adjusts the screw speed and feed rate to control the shear heat generated by the material within the barrel structure 4. Appropriate speed and feed rate can maintain a stable molten state of the plastic and prevent overheating or overcooling. Finally, the twin-screw structure 3 continuously applies pressure to the die structure 6, extruding the material to the outlet of the die structure 6. The shape of the final product is determined by the mold in the die structure 6. Thus, the barrel structure 4 is divided into multiple temperature-controlled sections by the multi-section temperature-control structure 7, so that different sections have different temperatures. This prevents the PVC products produced by the barrel structure 4 from problems such as bubbles, deformation, and cracking, thereby ensuring product quality and production efficiency.

[0029] Furthermore, the driving mechanism 2 has a motor swing frame 201, a driving motor 202, a power output wheel 203, a transmission belt structure 204, a power input wheel 205, a reducer structure 206 and a coupling structure 207; the motor swing frame 201 is movably arranged in the frame 1, and the driving motor 202 is connected to the motor swing frame 201; the driving motor 202 is driven and connected to the power output wheel 203, and the transmission belt structure 204 is respectively connected to the power output wheel 203 and the power input wheel 205; the power input wheel 205 is connected to the reducer structure 206; the coupling structure 207 is respectively connected to the reducer structure 206 and the twin-screw structure 3.

[0030] Specifically, when the drive motor 202 is started, it can drive the power output wheel 203 to rotate, and then input power to the power input wheel 205 through the transmission belt structure 204; the power input wheel 205 then transmits the power to the reducer structure 206. The reducer structure 206 is connected to the coupling structure 207, thereby transmitting the force processed by the reducer structure 206 to the twin-screw structure 3. Specifically, the reducer structure 206 can reduce the speed of the power output wheel 203 and increase its torque, and then drive the twin-screw structure 3 through the coupling structure 207.

[0031] More specifically, the motor swing frame 201 can be movably connected along the connection between it and the frame 1, so that it can drive the drive motor 202 to form different swing angles, thereby adjusting the driving force between the transmission belt structure 204 and the power output wheel 203 and the power input wheel 205; to prevent the transmission belt structure 204 from deviating, etc.

[0032] Furthermore, the twin-screw structure 3 includes a first screw 301, a second screw 302, and a meshing transmission structure 303. The meshing transmission structure 303 is provided at the same end of the first screw 301 and the second screw structure 302, and the first screw 301 and the second screw structure 302 are connected via the meshing transmission structure 303. Specifically, the meshing transmission structure 303 includes meshing transmission components such as gears, so that the two can be linked through meshing transmission.

[0033] Furthermore, the barrel structure 4 comprises a barrel body 401 and a plurality of barrel support seats 402. The barrel body 401 is disposed above the frame 1 between the die head structure 6 and the coupling structure 207. The twin-screw structure 3 is movably disposed within the barrel body 401, and the feeding funnel structure 5 is connected to the barrel body 401. A plurality of barrel support seats 402 are evenly spaced apart and disposed on the frame 1, each of which is connected to the barrel body 401. Specifically, the barrel support seats 402 serve as a supporting structure to support and connect the barrel body 401 thereto, so that the barrel body 401 establishes a channel for extrusion connection between the feeding funnel structure 5 and the die head structure 6.

[0034] Furthermore, the die structure 6 comprises a die body 601, a die temperature control structure 602, and an extrusion die structure 603; the die body 601 is connected to one end of the barrel body 401, the die temperature control structure 602 is connected to the die body 601, and the die temperature control structure 602 is electrically connected to the electronic control module 8; the extrusion die structure 603 is disposed at the other end of the die body 601 relative to the barrel body 401. Specifically, the material flowing out of the barrel structure 4 enters the extrusion die structure 603 from the die body 601, so that the extruded material is formed into a profile according to the profile preset in the die; and the die temperature control structure 602 can be wrapped around the periphery of the die body 601 to control the temperature of the material at the extrusion end under the control of the electronic control module 8.

[0035] Furthermore, the multi-stage temperature control structure 7 has a temperature-controlled blower 701, an air hood structure 702, an air duct connection seat 703 and several air supply ducts 704; several of the temperature-controlled blowers 701 are distributed in the frame 1, and the electronic control module 8 is respectively controlled and connected with each of the temperature-controlled blowers 701; several of the air hood structures 702 are evenly distributed between the feeding funnel structure 5 and the head structure 6, and each of the air hood structures 702 is covered around the barrel body 401; the bottom of each of the air hood structures 702 is correspondingly connected to an air duct connection seat 703, and each of the air supply ducts 704 is correspondingly connected to an air duct connection seat 703 and a temperature-controlled blower 701. Specifically, the electronic control module 8 has necessary components such as a circuit board control unit, which can control the start and stop of the heating structure inside the temperature-controlled blower 701 to make the temperature-controlled blower 701 blow out cold air or hot air, and then, the cold air or hot air generated by each temperature-controlled blower 701 is blown to the preset segmented part of the barrel body 401 through the air supply duct 704, and the barrel body 401 of this section is covered therein through the wind hood structure 702 and the air duct connecting seat 703, thereby improving the temperature control effect.

[0036] To sum up, the twin-screw extruder for PVC production of the present invention is respectively provided with a frame 1, a driving mechanism 2, a twin-screw structure 3, a barrel structure 4, a feeding funnel structure 5, a head structure 6, a multi-stage temperature control structure 7 and an electronic control module 8; the driving mechanism 2 is arranged on one side of the frame 1, and the driving mechanism 2 is driven and connected to the twin-screw structure 3; the twin-screw structure 3 is movably arranged in the barrel structure 4, and the barrel structure 4 is arranged on the frame 1; the feeding funnel structure 5 is arranged on one end of the barrel structure 4, and the head structure 6 is arranged at the other end of the barrel structure 4 relative to the feeding funnel structure 5; the multi-stage temperature control structure 7 is arranged between the feeding funnel structure 5 and the head structure 6, and the multi-stage temperature control structure 7 is connected to the barrel structure 4; the electronic control module 8 is arranged on the side of the frame 1, and the electronic control module 8 is respectively controlled and connected with the driving mechanism 2 and the multi-stage temperature control structure 7. The multi-stage temperature control structure 7 divides the barrel structure 4 into multiple temperature control sections, so that different sections have different temperatures. This prevents the PVC products produced by the barrel structure 4 from problems such as bubbles, deformation, and cracking, thereby ensuring product quality and production efficiency. Therefore, the twin-screw extruder for PVC production of the present invention solves the technical problem of how to improve the convenience of temperature control of different sections of the barrel of a twin-screw extruder.

[0037] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0038] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A twin-screw extruder for PVC production, characterized in that: It includes: A frame (1), a driving mechanism (2), a twin-screw structure (3), a barrel structure (4), a feeding funnel structure (5), a head structure (6), a multi-stage temperature control structure (7) and an electric control module (8); the driving mechanism (2) is arranged on one side of the frame (1), and the driving mechanism (2) is connected to the twin-screw structure (3); the twin-screw structure (3) is movably arranged in the barrel structure (4), and the barrel structure (4) is arranged on the frame (1); the feeding funnel structure (5) is arranged on the The head structure (6) is arranged on one end of the barrel structure (4) relative to the feeding funnel structure (5) at the other end of the barrel structure (4); the multi-stage temperature control structure (7) is arranged between the feeding funnel structure (5) and the head structure (6), and the multi-stage temperature control structure (7) is connected to the barrel structure (4); the electric control module (8) is arranged on the side of the frame (1), and the electric control module (8) is respectively controlled and connected to the driving mechanism (2) and the multi-stage temperature control structure (7).

2. The twin-screw extruder for PVC production according to claim 1, characterized in that: The driving mechanism (2) comprises a motor swing frame (201), a driving motor (202), a power output wheel (203), a transmission belt structure (204), a power input wheel (205), a speed reducer structure (206) and a coupling structure (207).

3. The twin-screw extruder for PVC production according to claim 2, characterized in that: The motor swing frame (201) is movably arranged in the frame (1); the drive motor (202) is connected to the motor swing frame (201); the drive motor (202) is drivingly connected to the power output wheel (203); the transmission belt structure (204) is respectively connected to the power output wheel (203) and the power input wheel (205); the power input wheel (205) is connected to the reducer structure (206); and the coupling structure (207) is respectively connected to the reducer structure (206) and the twin-screw structure (3).

4. The twin-screw extruder for PVC production according to claim 3, characterized in that: The barrel structure (4) comprises a barrel body (401) and a plurality of barrel support seats (402).

5. The twin-screw extruder for PVC production according to claim 4, characterized in that: The barrel body (401) is arranged above the frame (1) between the head structure (6) and the coupling structure (207); the twin-screw structure (3) is movably arranged in the barrel body (401), and the feeding funnel structure (5) is connected to the barrel body (401); a plurality of barrel support seats (402) are evenly spaced and arranged on the frame (1), and each barrel support seat (402) is connected to the barrel body (401).

6. The twin-screw extruder for PVC production according to claim 5, characterized in that: The die structure (6) comprises a die body (601), a die temperature control structure (602) and an extrusion die structure (603).

7. The twin-screw extruder for PVC production according to claim 6, characterized in that: The die body (601) is connected to one end of the barrel body (401), the die temperature control structure (602) is connected to the die body (601), and the die temperature control structure (602) is electrically connected to the electronic control module (8); the extrusion die structure (603) is arranged at the other end of the die body (601) relative to the barrel body (401).

8. The twin-screw extruder for PVC production according to claim 7, characterized in that: The multi-stage temperature control structure (7) comprises a temperature control blower (701), an air collecting hood structure (702), an air duct connection seat (703) and a plurality of air supply ducts (704).

9. The twin-screw extruder for PVC production according to claim 8, characterized in that: A plurality of the temperature-controlled blowers (701) are distributed in the rack (1), and the electric control module (8) is respectively connected to each of the temperature-controlled blowers (701) for control.

10. The twin-screw extruder for PVC production according to claim 9, characterized in that: A plurality of the air hood structures (702) are evenly distributed between the feeding funnel structure (5) and the machine head structure (6), and each of the air hood structures (702) is arranged to cover the periphery of the barrel body (401); the bottom of each of the air hood structures (702) is correspondingly connected to an air duct connection seat (703), and each of the air supply ducts (704) is correspondingly connected to an air duct connection seat (703) and a temperature-controlled blower (701).

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