A composite screw

Abstract

This utility model discloses a combined screw, comprising a screw body composed of screw assemblies and threaded connecting rods. Six screw assemblies are arranged sequentially along the axial direction, and adjacent screw assemblies are connected by threaded connecting rods. Each screw assembly consists of an outer rod and an inner rod. A mounting hole is formed at the center of the end wall of the outer rod, and the inner rod is installed within the mounting hole. Helical blades are provided on the circumferential outer wall of the outer rod, and limiting protrusions arranged in a ring array are provided on the circumferential outer wall of the inner rod. The other end of each limiting protrusion is installed within a limiting groove. This utility model not only facilitates the disassembly and replacement of locally worn helical blades on the screw body, avoiding the need for complete screw body replacement, but also facilitates the disassembly, transportation, and assembly of the screw body onto equipment.

Description

Technical Field

[0001] This utility model relates to the field of screw technology, specifically a combined screw. Background Technology

[0002] In industrial production, screws are widely used in chemical, food, and plastics processing industries as key components for material conveying and extrusion molding. Taking plastic extruders as an example, the screw propels the material forward and achieves plasticization through the rotation of the helical blades. However, during long-term operation, the continuous friction between the helical blades and the material, as well as complex working conditions such as high temperature and high pressure, can easily lead to localized wear of the helical blades.

[0003] A search revealed that patent publication number CN218660380U discloses a combined screw for use in plastic profile extrusion equipment. The screw includes a rod body and a conveying mechanism, with an installation sleeve fitted onto the surface of the rod body. This invention utilizes limiting rings installed on the surfaces of the limiting seat and the installation sleeve. When used in conjunction with locking seats, the two locking seats are engaged to secure the limiting seat and the installation sleeve. Combined with a sealing block and a limiting groove, the interior of the installation sleeve is sealed. The rod body can be installed simply by using bolts to limit the limiting block, eliminating the need for external bolt tightening and improving installation and disassembly efficiency. Furthermore, the installation sleeve has an internal groove, which, in conjunction with a heating coil, heats the interior of the installation sleeve, drying the conveyed powder and preventing moisture from clogging the inside of the installation sleeve, thus reducing the burden on the rod body and ensuring the normal operation of the extrusion process.

[0004] In practical use, existing modular screws often require the entire screw to be disassembled and replaced when the helical blades on the screw experience localized wear. This method results in high replacement costs, and the screw is often quite long, making it inconvenient for workers to transport it or assemble it into equipment in a small space. Therefore, a modular screw is designed. Utility Model Content

[0005] In view of the defects or shortcomings of the combined screw, the purpose of this utility model is to provide a combined screw that not only facilitates the disassembly and replacement of locally worn helical blades on the screw body by the workers, avoiding the need to replace the entire screw body, but also facilitates the disassembly, transportation and assembly of the screw body onto the equipment.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0007] This utility model provides a combined screw, including a screw body composed of screw assemblies and threaded connecting rods. There are six screw assemblies, and the six screw assemblies are arranged and assembled sequentially along the axial direction. Each pair of adjacent screw assemblies is connected by a threaded connecting rod. Each screw assembly is composed of an outer rod and an inner rod.

[0008] The outer rod has a mounting hole at the center of its end wall, and the inner rod is installed in the mounting hole. The outer rod has a spiral blade on its circumferential outer wall, and the inner rod has a limiting protrusion arranged in a ring array on its circumferential outer wall. The other end of the limiting protrusion is installed in a limiting groove, and the limiting groove is arranged in a ring array on the wall of the mounting hole. The outer rod has a first threaded hole arranged in a ring array on its end wall, and the inner rod has a second threaded hole arranged in a ring array on its end wall.

[0009] Preferably, the outer wall of the limiting protrusion and the groove wall of the limiting groove are in clearance fit.

[0010] Preferably, the outer circumferential wall of the inner rod and the inner circumferential wall of the mounting hole are in a clearance fit.

[0011] Preferably, the first threaded hole on the outer rod is connected to the first threaded hole on the adjacent outer rod by a threaded connecting rod.

[0012] Preferably, the second threaded hole on the inner rod is connected to the second threaded hole on the adjacent inner rod by a threaded connecting rod.

[0013] Preferably, an internal hexagonal hole is provided at the center of the end wall at both ends of the threaded connecting rod.

[0014] Compared with existing technologies, one or more of the above technical solutions have the following beneficial effects:

[0015] 1. In this utility model, through a series of structural arrangements, the screw body is composed of six screw assemblies and several threaded connecting rods. The screw assemblies are connected to each other in pairs through threaded connecting rods. When the helical blades on the screw body show local wear, the operator removes the screw assembly with the worn helical blades from the six screw assemblies, then removes the outer rod on the screw assembly and replaces it with a new outer rod to complete the replacement of the helical blades. Thus, this utility model facilitates the disassembly and replacement of locally worn helical blades on the screw body, avoiding the situation of replacing the entire screw body due to local damage, and reducing maintenance costs.

[0016] 2. In this utility model, through a series of structural arrangements, the screw body adopts a segmented design. The six screw components and several threaded connecting rods can be disassembled. The disassembled parts are small in size, which makes it easier for workers to disassemble and transport the screw body, reducing manpower and material costs. At the same time, it facilitates the disassembly and assembly of the screw body in narrow spaces, improving the flexibility of screw body installation. Attached Figure Description

[0017] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0018] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model.

[0019] Figure 2 This is an exploded structural diagram of the entire utility model.

[0020] Figure 3 This is a schematic diagram of the screw assembly of this utility model.

[0021] Figure 4 This is a partial structural schematic diagram of the threaded connecting rod of this utility model.

[0022] In the picture:

[0023] 100. Screw body;

[0024] 110. Screw assembly;

[0025] 111. Outer rod; 1111. Helical blade; 1112. First threaded hole; 1113. Mounting hole; 1114. Limiting groove;

[0026] 112. Inner rod; 1121. Limiting protrusion; 1122. Second threaded hole; 120. Threaded connecting rod; 121. Internal hexagonal hole. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0029] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0030] like Figure 1-4 As shown, a combined screw includes a screw body 100 composed of screw assemblies 110 and threaded connecting rods 120. There are six screw assemblies 110, and the six screw assemblies 110 are arranged and assembled in sequence along the axial direction. The screw assemblies 110 are connected to each other by threaded connecting rods 120. The screw assembly 110 is composed of an outer rod 111 and an inner rod 112.

[0031] An installation hole 1113 is provided at the center of the end wall of the outer rod 111. The inner rod 112 is installed in the installation hole 1113. A spiral blade 1111 is provided on the circumferential outer wall of the outer rod 111. A limiting protrusion 1121 distributed in a ring array is provided on the circumferential outer wall of the inner rod 112. The other end of the limiting protrusion 1121 is installed in the limiting groove 1114. The limiting groove 1114 is arranged in a ring array on the wall of the installation hole 1113. A first threaded hole 1112 distributed in a ring array is provided on the end wall of the outer rod 111. A second threaded hole 1122 distributed in a ring array is provided on the end wall of the inner rod 112.

[0032] The outer wall of the limiting protrusion 1121 and the groove wall of the limiting groove 1114 are in clearance fit. The fit between the limiting protrusion 1121 and the limiting groove 1114 means that when the outer rod 111 rotates, it will drive the inner rod 112 to rotate together.

[0033] The outer circumferential wall of the inner rod 112 and the inner circumferential wall of the mounting hole 1113 are in clearance fit. Because the outer wall of the limiting protrusion 1121 and the groove wall of the limiting groove 1114 are in clearance fit, and the outer circumferential wall of the inner rod 112 and the inner circumferential wall of the mounting hole 1113 are in clearance fit, it is convenient to disassemble and assemble the inner rod 112 and the outer rod 111.

[0034] The first threaded hole 1112 on the outer rod 111 is connected to the first threaded hole 1112 on the adjacent outer rod 111 by a threaded connecting rod 120. Since the first threaded hole 1112 on the outer rod 111 is connected to the first threaded hole 1112 on the adjacent outer rod 111 by a threaded connecting rod 120, the worker only needs to remove the threaded connecting rod 120 connecting the outer rod 111 to the adjacent outer rod 111 to complete the disassembly of the outer rod 111 to the adjacent outer rod 111.

[0035] The second threaded hole 1122 on the inner rod 112 is connected to the second threaded hole 1122 on the adjacent inner rod 112 by a threaded connecting rod 120. Since the second threaded hole 1122 on the inner rod 112 is connected to the second threaded hole 1122 on the adjacent inner rod 112 by a threaded connecting rod 120, the worker only needs to remove the threaded connecting rod 120 connecting the inner rod 112 to the adjacent inner rod 112 to complete the disassembly of the inner rod 112 and the adjacent inner rod 112.

[0036] The threaded connecting rod 120 has internal hexagonal holes 121 at the center of the end walls at both ends. The internal hexagonal holes 121 facilitate the disassembly and assembly of the threaded connecting rod 120 by the staff.

[0037] Working principle: The screw body 100 is composed of six screw assemblies 110 and several threaded connecting rods 120. Each pair of adjacent screw assemblies 110 is connected by a threaded connecting rod 120, facilitating disassembly and assembly by the operator. When the helical blades 1111 on the screw body 100 show localized wear, the operator removes the screw assembly 110 with the worn helical blades 1111, then removes the outer rod 111 from the screw assembly 110 and replaces it with a new one, thus completing the replacement of the helical blades 1111. The utility model facilitates the disassembly and replacement of locally worn spiral blades 1111 on the screw body 100 by workers, avoiding the need to replace the entire screw body 100 due to partial damage, thus reducing maintenance costs. The screw body 100 adopts a segmented design, and the six screw assemblies 110 and several threaded connecting rods 120 can all be disassembled. The disassembled parts are small in size, which makes it easy for workers to disassemble and transport the screw body 100, reducing labor and material costs. At the same time, it facilitates the disassembly and assembly of the screw body 100 in narrow spaces, improving the installation flexibility of the screw body 100.

[0038] The above description is merely a preferred embodiment of this utility model and is not intended to limit the invention. For those skilled in the art, various modifications and variations can be made to this invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the protection scope of this invention.

Claims

1. A combined screw comprising a screw body (100) combined from a screw assembly (110) and a threaded connecting rod (120), characterized in that: There are six screw assemblies (110), and the six screw assemblies (110) are arranged and assembled in sequence along the axial direction. The screw assemblies (110) are connected to each other by threaded connecting rods (120). The screw assembly (110) is composed of an outer rod (111) and an inner rod (112). The outer rod (111) has a mounting hole (1113) at the center of its end wall. The inner rod (112) is installed in the mounting hole (1113). The outer rod (111) has a spiral blade (1111) on its circumferential outer wall. The inner rod (112) has a limiting protrusion (1121) arranged in a ring array on its circumferential outer wall. The other end of the limiting protrusion (1121) is installed in a limiting groove (1114). The limiting groove (1114) is arranged in a ring array on the wall of the mounting hole (1113). The outer rod (111) has a first threaded hole (1112) arranged in a ring array on its end wall. The inner rod (112) has a second threaded hole (1122) arranged in a ring array on its end wall.

2. The modular screw of claim 1, wherein: The outer wall of the limiting protrusion (1121) and the groove wall of the limiting groove (1114) are in clearance fit.

3. The modular screw of claim 1, wherein: The outer circumferential wall of the inner rod (112) and the inner circumferential wall of the mounting hole (1113) are in clearance fit.

4. The combined screw according to claim 1, characterized in that: The first threaded hole (1112) on the outer rod (111) and the first threaded hole (1112) on the adjacent outer rod (111) are connected by a threaded connecting rod (120).

5. The combined screw according to claim 1, characterized in that: The second threaded hole (1122) on the inner rod (112) and the second threaded hole (1122) on the adjacent inner rod (112) are connected by a threaded connecting rod (120).

6. The combined screw according to claim 1, characterized in that: The threaded connecting rod (120) has internal hexagonal holes (121) at the center of the end walls at both ends.

Images