A double screw barrel which can be welded repeatedly

Abstract

The utility model belongs to the technical field of extruder relates to a kind of double screw barrel of repeated welding, including barrel, the cavity that accommodating parallel double screw is rotated oppositely is equipped in the barrel, the barrel includes mutually spliced upper barrel and lower barrel, the upper barrel and lower barrel are formed with the upper cavity and lower cavity of being spliced into complete cavity respectively in, and the inner wall of the upper cavity and lower cavity is spaced apart and is provided with wear-resistant patch along axial direction.The double screw barrel of repeated welding provided by the utility model can significantly reduce the use cost of equipment full life cycle.

Description

Technical Field

[0001] This utility model belongs to the technical field of extruders and relates to a twin-screw barrel that can be repeatedly welded. Background Technology

[0002] Parallel twin-screw extruders were developed based on single-screw extruders. Due to their excellent feeding performance, mixing and plasticizing performance, venting performance, and extrusion stability, they are now widely used in the molding and processing of extruded products.

[0003] During processing, continuous friction and corrosion occur between the inner wall of the barrel and the material, leading to wear of the inner wall and an increased gap between the barrel and the screw. This ultimately affects the plasticizing effect and extrusion stability, causing the entire machine to become unusable. Traditional one-piece barrels cannot be repaired in this situation, and replacement costs are high. This problem is particularly severe when the material in a flat twin-screw extruder contains a large amount of impurities (such as when using recycled plastics). Utility Model Content

[0004] This invention addresses the shortcomings of existing technologies by providing a repeatedly weldable twin-screw barrel, which can significantly reduce the overall lifecycle cost of the equipment.

[0005] To solve the above-mentioned technical problems, the objective of this utility model is achieved through the following technical solution: A repeatedly weldable twin-screw barrel includes a barrel with a cavity inside to accommodate parallel twin screws rotating in opposite directions. The barrel includes an upper barrel and a lower barrel that are spliced ​​together. The upper barrel and the lower barrel respectively form an upper cavity and a lower cavity that can be spliced ​​together to form a complete cavity. Wear-resistant patches are axially spaced on the inner walls of the upper cavity and the lower cavity.

[0006] In the aforementioned reusable weldable twin-screw barrel, the wear-resistant patch is made of a material with excellent wear resistance; preferably, the wear-resistant patch is made of cemented carbide.

[0007] In the aforementioned reusable weldable twin-screw barrel, several dovetail grooves are axially arranged on the inner walls of the upper and lower cavities, and the wear-resistant patch is embedded in the dovetail grooves and welded in place.

[0008] In the aforementioned reusable weldable twin-screw barrel, the working surface of the wear-resistant patch protrudes from the inner wall surface of the upper or lower cavity, and the gap between adjacent wear-resistant patches forms a guide gap for material conveying.

[0009] In the aforementioned reusable weldable twin-screw barrel, both the upper and lower barrels are cuboid structures, and the left and right sides of the upper and lower barrels are detachably connected by several vertically arranged fasteners.

[0010] As a further improvement to this utility model: In the aforementioned reusable weldable twin-screw extruder barrel, the upper barrel is provided with several mounting through holes for connecting extruder components.

[0011] In the aforementioned reusable weldable twin-screw extruder, the extruder assembly is selected from one or more of a filter, a shredder, and a vacuum device.

[0012] In the aforementioned reusable weldable twin-screw barrel, along the material conveying direction, the parallel twin screws are sequentially provided with a front conveying section, a stop section, and a rear conveying section. Correspondingly, the upper barrel is sequentially provided with a shredder mounting through hole corresponding to the starting end of the front conveying section, a filter mounting through hole corresponding to the stop section, and a vacuum device mounting through hole corresponding to the rear conveying section.

[0013] In the aforementioned reusable weldable twin-screw barrel, a front helical blade is provided on the screw rotation shaft of the front conveying section, a rear helical blade is provided on the screw rotation shaft of the rear conveying section, and a number of radial blades are spaced apart on the screw rotation shaft of the cut-off section. Both the front and rear helical blades can convey material forward when rotating, while the radial blades cannot convey material when rotating, thus cutting off material conveying.

[0014] Compared with the prior art, this utility model has the following advantages: 1. This utility model provides a reusable weldable twin-screw extruder barrel. Through the detachable splicing design of the upper and lower barrels, the barrel can be easily opened for maintenance when the internal cavity is worn or needs cleaning. More importantly, the wear on the inner wall is mainly borne by replaceable wear-resistant patches. Once the wear-resistant patches wear to their limit, they can be replaced individually without scrapping the entire expensive barrel body. This achieves "reusable welding" of the core component, greatly extending the overall lifespan of the machine.

[0015] 2. This invention, by incorporating wear-resistant patches, can further create a unique structure of guide gaps. While protecting the barrel, it also positively impacts material flow. The guide gaps create controllable flow resistance and backflow, contributing to material homogenization and mixing, thus improving product quality.

[0016] 3. This utility model adopts a highly modular design to improve maintenance convenience: the entire barrel adopts a two-stage modular design with upper and lower sections and wear-resistant patches; the rectangular shape and side fasteners facilitate disassembly and assembly; the dovetail groove fixing method for the patches is reliable and easy to replace; and standardized interfaces facilitate the connection of various functional components. This makes equipment cleaning, component replacement, and functional adjustment exceptionally simple, significantly reducing downtime. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present invention; Figure 2 This is a radial cross-sectional view of the present invention; Figure 3 yes Figure 2 A magnified view of a section (some wear-resistant patches have been removed); Reference numerals: 1. Barrel; 1a. Upper barrel; 1b. Lower barrel; 2. Cavity; 2a. Upper cavity; 2b. Lower cavity; 3. Wear-resistant patch; 4. Dovetail groove; 5. Fastener; 6. Shredder mounting through hole; 7. Filter mounting through hole; 8. Vacuum device mounting through hole. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-3 : A reusable weldable twin-screw barrel 1 includes a barrel 1, wherein the barrel 1 has a cavity 2 for accommodating parallel twin screws rotating in opposite directions. The barrel 1 includes an upper barrel 1a and a lower barrel 1b that are spliced ​​together. The upper barrel 1a and the lower barrel 1b respectively form an upper cavity 2a and a lower cavity 2b that can be spliced ​​together to form a complete cavity 2. Wear-resistant patches 3 are axially spaced on the inner walls of the upper cavity 2a and the lower cavity 2b.

[0019] Comparison Appendix Figure 1 and attached Figure 2 In this embodiment, both the upper cylinder 1a and the lower cylinder 1b are cuboid structures. The left and right sides of the upper cylinder 1a and the lower cylinder 1b are detachably connected by several vertically arranged fasteners 5. This regular shape facilitates processing, positioning, and installation, while the lateral fastening method makes disassembly and assembly operations more convenient. After loosening the fasteners 5, the upper and lower cylinders 1b can be separated, allowing the upper cavity 2a and the lower cavity 2b to open.

[0020] Comparison Appendix Figure 3 The inner walls of the upper cavity 2a and the lower cavity 2b are provided with a plurality of dovetail grooves 4 extending axially. The wear-resistant patch 3 is embedded in the dovetail grooves 4 and welded and fixed. When the upper cavity 2a and the lower cavity 2b are opened, the wear-resistant patch 3 is exposed. After removing the solder joints of the wear-resistant patch 3, the wear-resistant patch 3 can be pulled out from the dovetail groove 4 for replacement and re-welding. At the same time, the dovetail groove 4 structure can firmly lock the wear-resistant patch 3, preventing it from loosening or shifting due to material pressure and friction during operation.

[0021] Preferably, the working surface of the wear-resistant patch 3 protrudes from the inner wall surface of the upper cavity 2a or the lower cavity 2b, and the gap between adjacent wear-resistant patches 3 forms a guide gap for material conveying. This structure not only bears the main friction and wear through the protruding wear-resistant patches 3, protecting the barrel 1 base, but also the unique guide gap facilitates material conveying and mixing, while providing additional shear for the melt.

[0022] As a further improvement to this embodiment: The upper barrel 1a described above has several mounting through holes for connecting extruder components. The extruder components are selected from one or more of filters, shredders, and vacuum devices. Through these mounting through holes, extruder components can be easily added, greatly expanding the extruder's functionality and improving the extrusion effect. These mounting through holes are particularly suitable for installation on the rectangular barrel 1.

[0023] Specifically: Along the material conveying direction, the parallel twin screw is sequentially provided with a front conveying section, a stop section, and a rear conveying section: the front conveying section has a front helical blade on its screw rotation shaft, the rear conveying section has a rear helical blade on its screw rotation shaft, and the stop section has a number of radial blades spaced apart on its screw rotation shaft. The front and rear helical blades can convey material forward when rotating, while the radial blades cannot convey material when rotating, thus stopping the material conveying.

[0024] Specifically: the upper barrel 1a is sequentially provided with a shredder mounting through-hole 6 corresponding to the starting end of the front conveying section, a filter mounting through-hole 7 corresponding to the stop section, and a vacuum device mounting through-hole 8 corresponding to the rear conveying section. Through the filter: the molten material conveyed from the front conveying section is forced through the feed through-hole into the filter under the obstruction and pressure build-up of the stop section. After impurities are removed by filtration, the clean melt returns to the barrel 1 through the discharge through-hole and enters the rear screw conveying section. Through the vacuum device: contaminated air in the inner cavity of the barrel 1 can be extracted, making the entire conveying structure cleaner. Through the shredder: large and irregular pieces of material can be pre-treated to form small, regular pieces for subsequent processing.

[0025] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A reusable weldable twin-screw barrel, comprising a barrel (1), wherein the barrel (1) is provided with a cavity (2) for accommodating parallel twin screws rotating in opposite directions, characterized in that, The machine barrel (1) includes an upper machine barrel (1a) and a lower machine barrel (1b) that are spliced ​​together. The upper machine barrel (1a) and the lower machine barrel (1b) respectively form an upper cavity (2a) and a lower cavity (2b) that can be spliced ​​together to form a complete cavity (2). Wear-resistant patches (3) are provided axially spaced on the inner walls of the upper cavity (2a) and the lower cavity (2b).

2. The repeatedly weldable twin-screw barrel according to claim 1, characterized in that, The inner walls of the upper cavity (2a) and the lower cavity (2b) are provided with a number of dovetail grooves (4) running through them along the axial direction. The wear-resistant patch (3) is embedded in the dovetail groove (4) and welded and fixed.

3. The repeatedly weldable twin-screw barrel according to claim 1, characterized in that, The working surface of the wear-resistant patch (3) protrudes from the inner wall surface of the upper cavity (2a) or the lower cavity (2b), and the gap between adjacent wear-resistant patches (3) forms a guide gap for material conveying.

4. The repeatedly weldable twin-screw barrel according to claim 1, characterized in that, The upper cylinder (1a) and the lower cylinder (1b) are both rectangular structures. The left and right sides of the upper cylinder (1a) and the lower cylinder (1b) are detachably connected by several vertically arranged fasteners (5).

5. A repeatedly weldable twin-screw barrel according to claim 4, characterized in that, The upper barrel (1a) has several mounting holes for connecting extruder components.

6. A repeatedly weldable twin-screw barrel according to claim 5, characterized in that, The extruder assembly is selected from one or more of a filter, a shredder, and a vacuum device.

7. A repeatedly weldable twin-screw barrel according to claim 6, characterized in that, Along the material conveying direction, the parallel twin screw is provided with a front conveying section, a stop section and a rear conveying section in sequence. The upper cylinder (1a) is provided with a shredder installation through hole (6) corresponding to the starting end of the front conveying section, a filter installation through hole (7) corresponding to the stop section and a vacuum device installation through hole (8) corresponding to the rear conveying section in sequence.

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