PVC (polyvinyl chloride) counter-rotating twin-screw extruder

Abstract

The utility model provides a PVC (polyvinyl chloride) counter-rotating twin-screw extruder which comprises a protective lower machine barrel, a protective upper machine barrel, a feeding pipeline, a heating inner machine barrel, a transmission structure, a charging section, a melting section and a homogenizing section, the protective lower machine barrel and the protective upper machine barrel are fixedly connected together, the feeding pipeline is fixedly mounted at one end of the protective lower machine barrel, and the heating inner machine barrel is fixedly mounted at the other end of the protective upper machine barrel. The heating inner machine barrel is fixedly mounted in the protective lower machine barrel and the protective upper machine barrel respectively; the transmission structure is arranged in the heating inner machine barrel, and a feeding section, a melting section and a homogenizing section are fixedly mounted on the surface of the transmission structure in sequence; due to the arrangement of the heating inner machine barrel and the transmission structure, the temperature of a plurality of areas can be accurately controlled, and the heating inner machine barrel can be quickly disassembled to clean and maintain the internal structure.

Description

Technical Field

[0001] The utility model relates to the technical field of twin-screw extruders, in particular to a PVC counter-rotating twin-screw extruder. Background Art

[0002] Extrusion technology is a commonly used plastic processing method, which is widely used in the field of plastic product production. Among them, PVC counter-rotating twin-screw extruder, as an important extrusion equipment, plays a key role in the plastic processing industry.

[0003] As a traditional plastic processing method, extrusion technology has gone through decades of development. The earliest extruder was a single-screw extruder, which transported the plastic raw materials from the feeding section to the extrusion head through a screw and formed the required cross-sectional shape at the extrusion head. With the growing demand for plastic products, twin-screw extruders came into being. Compared with single-screw extruders, twin-screw extruders have higher production efficiency and wider applicability, so they have been widely used.

[0004] The existing twin-screw extruder lacks an effective heating system, so the plastic raw materials cannot maintain a specific temperature at a specific position, and the heating temperature cannot be effectively and accurately controlled; since the existing twin-screw extruder lacks a design that is easy to clean and maintain, maintenance and downtime will increase.

[0005] Therefore, it is very necessary to invent a PVC counter-rotating twin-screw extruder. Utility Model Content

[0006] In order to solve the above technical problems, the utility model provides a PVC counter-rotating twin-screw extruder to solve the problem that the existing twin-screw extruder mechanism still has the problem of being unable to accurately control the temperature of multiple areas and being unable to quickly disassemble its internal structure for cleaning and maintenance. A PVC counter-rotating twin-screw extruder includes a protective lower barrel, a protective upper barrel, a feed pipe, a heated inner barrel, a transmission structure, a feeding section, a melting section and a homogenizing section, wherein: the protective lower barrel and the protective upper barrel are fixedly connected together, and the feed pipe is fixedly installed at one end of the protective lower barrel, and the heated inner barrel is fixedly installed inside the protective lower barrel and the protective upper barrel respectively; the transmission structure is arranged inside the heated inner barrel, and the feeding section, the melting section and the homogenizing section are fixedly installed on its surface in sequence.

[0007] The heated inner barrel comprises a lower heated barrel, an upper heated barrel, a feed port and an insulation node, and the lower heated barrel is fixedly mounted inside the protective lower barrel, and the upper heated barrel is fixedly mounted inside the protective upper barrel; the feed port is opened at one end of the upper heated barrel, and the insulation nodes are respectively fixedly mounted inside the lower heated barrel and the upper heated barrel, and the interior of the heated inner barrel is provided with grooves for mounting two sets of transmission structures.

[0008] The transmission structure includes a transmission shaft body, a support shaft, a connecting bracket, a support bracket and a power input shaft, and the transmission shaft body is arranged inside the heating inner barrel, and the support shaft is fixedly installed at one end of the transmission shaft body, and the power input shaft is fixedly installed at the other end of the transmission shaft body; the connecting bracket is arranged at one end of the support shaft, and the support bracket is fixedly installed at one end of the connecting bracket, and is fixedly connected to the protective lower barrel.

[0009] The lower hot barrel and the upper hot barrel inside the heating inner barrel are divided into three groups by two pairs of insulation nodes, which are respectively covered on the outside of the feeding section, the melting section and the homogenizing section; the lower hot barrel and the upper hot barrel adopt a steel metal structure, and holes are reserved inside for the rotation of the transmission structure; the three groups of segments inside the lower hot barrel and the upper hot barrel are all provided with dry-burning heating structures; the insulation nodes adopt a copper-nickel alloy block with a cross-section consistent with the hot barrel and the upper hot barrel, which can heat the plastic raw material to reach an appropriate melting temperature, and the three sections inside the heating inner barrel can independently provide different heat for the feeding section, the melting section and the homogenizing section, and the heat between them will not interfere with each other. This design helps to control the temperature of each section, and can more accurately control the temperature inside the barrel to ensure that the plastic raw material at each stage can reach the required heating degree, thereby realizing the smooth progress of the extrusion process. Through independent heating control, the temperature of each stage can be effectively adjusted to meet the requirements of the extrusion process and ensure the quality of the final product.

[0010] The transmission structure as a whole is connected to the driving device through the power input shaft to generate rotation, and the connecting bracket and the supporting bracket are made of steel metal structure to form two groups of supporting structures. The transmission shaft can generate rotation inside the supporting structure through the supporting shaft; the supporting structure made of the connecting bracket and the supporting bracket can be disassembled from the transmission shaft and the protective lower barrel, and has the following functions: ① Power transmission: The transmission structure is connected to the driving device through the power input shaft, and the mechanical energy is transmitted to the extruder to drive the screw to rotate, thereby pushing the plastic raw material forward for extrusion; ② Disassembly and cleaning: The design of the transmission structure takes into account the needs of disassembly and cleaning. The connecting bracket and the supporting bracket are made of steel metal structure to form two groups of supporting structures. The transmission shaft and the feeding section, melting section and homogenizing section on its surface can be easily disassembled for cleaning and maintenance, which is essential for maintaining the hygiene and long-term stable operation of the machine; ③ Rotation stability: The rotation stability of the transmission structure is essential for the continuity of the extrusion process. The transmission shaft generates rotation inside the supporting structure through the supporting shaft. The supporting structure made of the connecting bracket and the supporting bracket can ensure the stability of the transmission shaft during rotation, which helps to maintain the smooth operation of the extruder and improve production efficiency and product quality.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] 1. The setting of the heated inner barrel of the utility model can heat the plastic raw materials to make them reach the appropriate melting temperature. The three sections inside the heated inner barrel can independently provide different heat for the feeding section, melting section and homogenizing section, and the heat between them will not interfere with each other. This design helps to control the temperature of each section, and can more accurately control the temperature inside the barrel to ensure that the plastic raw materials at each stage can reach the required heating degree, thereby realizing the smooth progress of the extrusion process. Through independent heating control, the temperature of each stage can be effectively adjusted to meet the requirements of the extrusion process and ensure the quality of the final product.

[0013] 2. The setting of the transmission structure of the utility model has the following functions: ① Power transmission: The transmission structure is connected to the driving device through the power input shaft, and the mechanical energy is transmitted to the extruder to drive the screw to rotate, thereby pushing the plastic raw material forward for extrusion; ② Disassembly and cleaning: The design of the transmission structure takes into account the needs of disassembly and cleaning. The connecting bracket and the supporting bracket are made of steel metal structure to form two sets of supporting structures. The transmission shaft and the feeding section, melting section and homogenizing section on its surface can be easily disassembled for cleaning and maintenance, which is very important for maintaining the hygiene and long-term stable operation of the machine; ③ Rotational stability: The rotational stability of the transmission structure is very important for the continuity of the extrusion process. The transmission shaft rotates inside the supporting structure through the supporting shaft. The supporting structure made of the connecting bracket and the supporting bracket can ensure the stability of the transmission shaft during rotation, which helps to maintain the smooth operation of the extruder and improve production efficiency and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] Figure 2 It is a structural schematic diagram of the utility model for heating the inner barrel.

[0016] Figure 3 It is a structural schematic diagram of the transmission structure of the utility model.

[0017] In the figure:

[0018] Protective lower barrel 1, protective upper barrel 2, feed pipe 3, heated inner barrel 4, lower hot barrel 41, upper hot barrel 42, feed port 43, insulation node 44, transmission structure 5, transmission shaft 51, support shaft 52, connecting bracket 53, support bracket 54, power input shaft 55, feeding section 6, melting section 7, homogenizing section 8. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be described clearly and completely below. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0020] As attached Figure 1 To Attachment Figure 3 shown.

[0021] The utility model provides a PVC counter-rotating twin-screw extruder, comprising a protective lower barrel 1, a protective upper barrel 2, a feed pipe 3, a heated inner barrel 4, a transmission structure 5, a feeding section 6, a melting section 7 and a homogenizing section 8, wherein: the protective lower barrel 1 and the protective upper barrel 2 are fixedly connected together, and the feed pipe 3 is fixedly installed at one end of the protective lower barrel 1, and the heated inner barrel 4 is respectively fixedly installed inside the protective lower barrel 1 and the protective upper barrel 2; the transmission structure 5 is arranged inside the heated inner barrel 4, and the feed section 6, the melting section 7 and the homogenizing section 8 are fixedly installed on the surface of the transmission structure 5 in sequence.

[0022] The heated inner barrel 4 includes a lower heating barrel 41, an upper heating barrel 42, a feed port 43 and an insulation node 44, and the lower heating barrel 41 is fixedly installed inside the protective lower barrel 1, and the upper heating barrel 42 is fixedly installed inside the protective upper barrel 2; the feed port 43 is opened at one end of the upper heating barrel 42 and is connected to the feed pipe 3, and the insulation node 44 is fixedly installed inside the lower heating barrel 41 and the upper heating barrel 42 respectively.

[0023] The transmission structure 5 includes a transmission shaft body 51, a support shaft 52, a connecting bracket 53, a supporting bracket 54 and a power input shaft 55, and the transmission shaft body 51 is arranged inside the heating inner barrel 4, and the support shaft 52 is fixedly installed at one end of the transmission shaft body 51, and the power input shaft 55 is fixedly installed at the other end of the transmission shaft body 51; the connecting bracket 53 is arranged at one end of the support shaft 52, and the supporting bracket 54 is fixedly installed at one end of the connecting bracket 53, and is fixedly connected to the protective lower barrel 1.

[0024] Two mounting grooves are provided inside the heating inner barrel 4 corresponding to the twin screws; the lower heating barrel 41 and the upper heating barrel 42 inside the heating inner barrel 4 are divided into three groups by two pairs of insulation nodes 44, which are respectively coated on the outside of the feeding section 6, the melting section 7 and the homogenizing section 8; the lower heating barrel 41 and the upper heating barrel 42 adopt a steel metal structure, and holes are reserved inside for the rotation of the transmission structure 5; the three groups of segments inside the lower heating barrel 41 and the upper heating barrel 42 are all provided with dry-burning type heating structures; the insulation nodes 44 adopt copper-nickel alloy blocks with cross-sections consistent with those of the heating barrel 41 and the upper heating barrel 42.

[0025] The transmission structure 5 as a whole is connected to the driving device through the power input shaft 55 to generate rotation, and the connecting bracket 53 and the supporting bracket 54 are made of steel metal structure to form two sets of supporting structures. The transmission shaft body 51 can generate rotation inside the supporting structure through the supporting shaft 52; the supporting structure made of the connecting bracket 53 and the supporting bracket 54 can be removed from the transmission shaft body 51 and the protective lower barrel 1.

[0026] PVC counter-rotating twin-screw extruder is an important plastic processing equipment. Its working principle involves complex mechanical operation, thermodynamic process and plastic processing technology. The following will introduce its working principle in detail.

[0027] 1. Plastic raw material supply: The operation of the extruder starts with the supply of plastic raw materials. After pretreatment, the plastic particles are input into the feeding section 6 of the extruder through the feed pipe 3.

[0028] 2. Heating and melting: When the plastic particles enter the feeding section 6, the heating inner barrel 4 begins to work, and the heating system in the heating inner barrel 4 softens the plastic particles and gradually melts them; in the melting section 7, under the rotation of the twin screws, the plastic particles gradually form a uniform melt. This process is called plastic melting.

[0029] 3. Plastic mixing and homogenization: Next, the molten plastic passes through the homogenization section 8, where the design and structure of the twin screws allow the plastic to be evenly mixed and heated. During this process, high-pressure gas is discharged to the outside through small holes, which are set above the front ends of the protective upper barrel 2 and the heating inner barrel 4.

[0030] 4. Extrusion formation: After the plastic melt passes through the homogenization section 8, it enters the extrusion head of the extruder and is output to the outside.

[0031] 5. Cooling and solidification: Once extruded, the plastic product enters the cooling area, where cooling water or other cooling media are usually used to quickly cool the plastic to promote its solidification and stabilization. At this stage, the size and shape of the product are basically finalized, but still require further handling and processing.

[0032] 6. Product cutting and processing: Finally, the extruded product is cut by cutting equipment or other subsequent processing equipment to meet the final product requirements. This may include steps such as cutting to length, surface treatment, packaging, etc., and finally obtain plastic products that meet the requirements.

[0033] Summary: PVC counter-rotating twin-screw extruder converts raw materials into plastic products of desired shape through continuous processing steps such as heating, melting, mixing and extrusion. Its working principle includes heating and melting of plastics, stirring and conveying of twin screws, molding of extrusion heads and subsequent cooling and processing. These steps cooperate with each other to ensure the smooth operation of the extruder and the stability of product quality.

[0034] Utilizing the technical solution described in the utility model, or those skilled in the art designing similar technical solutions inspired by the technical solution of the utility model to achieve the above-mentioned technical effects, all fall within the protection scope of the utility model.

Claims

1. A PVC counter-rotating twin-screw extruder, characterized in that: The invention comprises a protective lower barrel (1), a protective upper barrel (2), a feed pipe (3), a heated inner barrel (4), a transmission structure (5), a feed section (6), a melting section (7) and a homogenizing section (8), wherein: the protective lower barrel (1) and the protective upper barrel (2) are fixedly connected together, and the feed pipe (3) is fixedly mounted on one end of the protective lower barrel (1), and the heated inner barrel (4) is respectively fixedly mounted inside the protective lower barrel (1) and the protective upper barrel (2); the transmission structure (5) is arranged inside the heated inner barrel (4), and the feed section (6), the melting section (7) and the homogenizing section (8) are fixedly mounted on the surface of the transmission structure (5) in sequence.

2. A PVC counter-rotating twin-screw extruder as claimed in claim 1, characterized in that: The heating inner barrel (4) comprises a lower heating barrel (41), an upper heating barrel (42), a feed port (43) and a heat insulation node (44), and the lower heating barrel (41) is fixedly mounted inside the protective lower barrel (1), and the upper heating barrel (42) is fixedly mounted inside the protective upper barrel (2); the feed port (43) is opened at one end of the upper heating barrel (42), and the heat insulation node (44) is respectively fixedly mounted inside the lower heating barrel (41) and the upper heating barrel (42), and two mounting grooves corresponding to the twin screws are arranged inside the heating inner barrel (4).

3. A PVC counter-rotating twin-screw extruder as claimed in claim 1, characterized in that: The transmission structure (5) comprises a transmission shaft body (51), a support shaft (52), a connecting bracket (53), a supporting bracket (54) and a power input shaft (55), wherein the transmission shaft body (51) is arranged inside the heating inner barrel (4), and the supporting shaft (52) is fixedly mounted on one end of the transmission shaft body (51), and the power input shaft (55) is fixedly mounted on the other end of the transmission shaft body (51); the connecting bracket (53) is arranged on one end of the support shaft (52), and the supporting bracket (54) is fixedly mounted on one end of the connecting bracket (53), and is fixedly connected to the protective lower barrel (1).

4. A PVC counter-rotating twin-screw extruder as claimed in claim 2, characterized in that: The lower heating barrel (41) and the upper heating barrel (42) inside the heating inner barrel (4) are divided into three groups by two pairs of insulation nodes (44), respectively covering the outside of the feeding section (6), the melting section (7) and the homogenizing section (8); the three groups of sections inside the lower heating barrel (41) and the upper heating barrel (42) are all provided with dry-burning type heating structures.

5. A PVC counter-rotating twin-screw extruder as claimed in claim 3, characterized in that: The transmission structure (5) is connected to the driving device as a whole via a power input shaft (55) to generate rotation, and the connecting bracket (53) and the supporting bracket (54) are made of a steel metal structure to form two sets of supporting structures. The transmission shaft (51) can generate rotation inside the supporting structure via the supporting shaft (52); the supporting structure formed by the connecting bracket (53) and the supporting bracket (54) can be removed from the transmission shaft (51) and the protective lower barrel (1).

6. A PVC counter-rotating twin-screw extruder as claimed in claim 4, characterized in that: The lower heating cylinder (41) and the upper heating cylinder (42) are made of steel metal structures, and holes are left inside the structures for the transmission structure (5) to rotate.

7. A PVC counter-rotating twin-screw extruder as claimed in claim 4, characterized in that: The heat-insulating node (44) is made of a copper-nickel alloy block having a cross-section consistent with that of the hot cylinder (41) and the upper hot cylinder (42).

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