Plastic extruder assembly type screw convenient to disassemble

Abstract

A plastic extruder assembly type screw convenient to disassemble relates to the technical field of plastic extruder screws and comprises a screw body and screw sleeves, a plurality of screw sleeves are movably and sequentially sleeved on the screw body through tooth grooves to form the screw, and every two adjacent screw sleeves are assembled together in a conical surface fit mode. According to the structure, polymers in a high-temperature area are prevented from permeating into tooth grooves between the threaded sleeves and the threaded rod body from gaps between the threaded sleeves, the phenomenon that the threaded sleeves are bonded to the threaded rod body and are difficult to take down due to solidification of the polymers during disassembly is eliminated, and disassembly is convenient. And due to the arrangement of the thread sleeve groove, the thread sleeve can be more conveniently separated and taken out through vibration by means of a tool through the thread sleeve groove.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic extruder screws, in particular to an assembled screw for a plastic extruder which is easy to disassemble. Background Art

[0002] Extruders are crucial equipment in the plastics processing industry. The screw inside an extruder achieves mixing and extrusion of materials. Existing twin-screw extruders are typically divided into six zones: the feed zone, preheating zone, melting zone, mixing zone, exhaust zone, and cooling zone. The screw is assembled by inserting sleeves one by one through the full-length tooth grooves on the screw body. The sleeves in different zones have different external threads to achieve different functions.

[0003] The above-mentioned existing screw structure has the problem of inconvenient disassembly. In actual production, when a piece of screw sleeve is damaged or the arrangement and combination of the screw sleeve needs to be adjusted, the screw sleeve needs to be removed for replacement and repair. During the production process, the polymer will penetrate into the gap between the screw sleeves after melting. When removing, the temperature drops rapidly. After the polymer solidifies, the screw sleeve and the screw body are adhered together, making it difficult to remove the screw sleeve from the screw body. It is necessary to heat it to a high temperature again to melt the polymer before the screw sleeve can be removed. Therefore, in order to solve the problem of the difficulty in removing the existing screw sleeve, the industry urgently needs a plastic extruder assembled screw that is easy to disassemble. Utility Model Content

[0004] The utility model aims to provide an assembled screw rod for a plastic extruder which is easy to disassemble, so as to facilitate the disassembly and assembly of the screw sleeve when the screw sleeve needs to be repaired or replaced.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] The utility model discloses an assembled screw for a plastic extruder that is easy to disassemble, comprising a screw body and a screw sleeve. The screw body is provided with a continuous tooth groove, and the inner surface of the screw sleeve is provided with a tooth groove matching the tooth groove. A plurality of screw sleeves are movably connected to the screw body in sequence through the tooth groove. A spiral spiral groove is provided on the outer surface of the screw sleeve. A protrusion and a recess are respectively provided at both ends of the screw sleeve. Two adjacent screw sleeves are assembled together through the protrusion and the recess.

[0007] In the above-mentioned easily disassembled assembled screw for the plastic extruder, the contact surface where the raised portion and the recessed portion are assembled together is a conical surface.

[0008] The above-mentioned easily disassembled assembled screw for the plastic extruder is provided with a sealing ring between the conical surfaces of the raised portion and the recessed portion.

[0009] The above-mentioned easily disassembled assembled screw for the plastic extruder is provided with a screw sleeve groove on each screw sleeve.

[0010] The utility model has the following advantages:

[0011] The screw of this utility model is composed of multiple sleeves that are movably connected to the screw body in sequence through tooth grooves. Two adjacent sleeves are assembled together by using conical surfaces, and a sealing ring is provided on the conical surface to provide a seal. This structure prevents polymers in high-temperature areas from seeping into the tooth grooves between the sleeves and the screw body through the gaps between the sleeves. It eliminates the problem of the sleeves being difficult to remove due to solidification of the polymer during disassembly, thus facilitating disassembly. The provision of the sleeve grooves allows the sleeves to be more conveniently vibrated and removed through the sleeve grooves with the help of a tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a partial cross-sectional schematic diagram of the utility model;

[0013] Figure 2 It is the AA section view;

[0014] The reference numerals in the figure represent: 1, screw body, 1-1, tooth groove, 2, screw sleeve, 2-1, spiral groove, 3, screw sleeve groove, 4, sealing ring, 5, protrusion, 6, recessed portion. DETAILED DESCRIPTION

[0015] The utility model discloses an assembled screw rod for a plastic extruder which is easy to disassemble. Figure 1 As shown, the assembled screw is composed of a plurality of screw sleeves 2 detachably sleeved on a screw body 1. A through-length tooth groove 1-1 is provided on the screw body 1, and the screw sleeves 2 are assembled with the screw body 1 through the tooth groove 1-1.

[0016] The utility model discloses an easily disassembled assembled screw for a plastic extruder. Each screw sleeve 2 is provided with a raised portion 5 at its left end and a recessed portion 6 at its right end. The mating surfaces of the raised portion 5 and the recessed portion 6 are conical, facilitating disassembly. A sealing ring 5 is provided on the mating surface to prevent molten polymer from penetrating into the tooth groove gap between the screw sleeve and the screw body, thereby causing adhesion between the two. The sealing ring 5 must have a certain thermal expansion and contraction performance, and its thermal expansion coefficient is greater than that of the screw sleeve, and its contraction coefficient is also greater than that of the screw sleeve.

[0017] The utility model provides an assembled screw for a plastic extruder which is easy to disassemble. Generally, the leakage area is located in the high-temperature melting area at the front of the screw. Therefore, the structure of the screw sleeve can be designed in a partitioned manner to reduce manufacturing costs.

[0018] The utility model provides an assembled screw for a plastic extruder that is easy to disassemble. Even if a sealing ring is installed, slight leakage may still occur in the gap between the sleeves, which will still cause certain difficulties when removing the sleeves. Therefore, sleeve grooves 3 are provided on the circumferential surface of the sleeve. The specific number of sleeve grooves is determined according to the situation. The sleeve can be conveniently vibrated and separated by a tool through the sleeve grooves 3. The position of the sleeve grooves 3 can be selected independently, for example, it can be designed at the joint of two adjacent sleeves so as not to damage the appearance of the overall structure of the sleeve.

Claims

1. An easily disassembled assembled screw for a plastic extruder, characterized by: The invention comprises a screw body (1) and a screw sleeve (2), wherein a continuous tooth groove (1-1) is provided on the screw body (1), a tooth groove matching the tooth groove (1-1) is provided on the inner surface of the screw sleeve (2), a plurality of screw sleeves (2) are movably sleeved on the screw body (1) in sequence through the tooth groove (1-1), a spiral groove (2-1) is provided on the outer surface of the screw sleeve (2), a raised portion (5) and a recessed portion (6) are respectively provided at both ends of the screw sleeve (2), and two adjacent screw sleeves (2) are assembled together through the raised portion (5) and the recessed portion (6).

2. The easily disassembled assembled screw for a plastic extruder according to claim 1, characterized in that: The contact surface where the raised portion (5) and the recessed portion (6) are assembled together is a conical surface.

3. The easily disassembled assembled screw for a plastic extruder according to claim 2, characterized in that: A sealing ring (4) is provided between the conical surfaces of the raised portion (5) and the recessed portion (6).

4. The easily disassembled assembled screw for a plastic extruder according to claim 1, characterized in that: A screw sleeve groove (3) is provided on each screw sleeve (2).

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