A seamless threaded block adapter for co-rotating parallel twin screw extruders

Abstract

The application discloses a seamless thread block adapter structure for a co-rotating parallel double-screw extruder, which comprises an adapter assembly composed of a 0-degree adapter plate and a 90-degree adapter plate, the 0-degree adapter plate is connected with a single-thread block, the 90-degree adapter plate is connected with a double-thread block, and phase matching is realized through complementary angles, so that a material conveying dead zone is eliminated. The seamless thread block adapter structure of the embodiment of the application adopts an approximately meshing block structure, the 0-degree adapter plate and the 90-degree adapter plate are connected, the dead zone is eliminated, the product quality is improved, and the front and rear thread blocks have a determined phase angle and a consistent cross-sectional profile, so that the installation accuracy can be ensured.

Description

Technical Field

[0001] This disclosure relates to the field of polymer material processing equipment technology, and in particular to a seamless threaded block adapter structure for a co-rotating parallel twin-screw extruder. Background Technology

[0002] Co-rotating parallel twin-screw extruders are core equipment in polymer material processing, and the stability of their transmission system directly affects product quality and production efficiency. In existing co-rotating parallel twin-screw extruders, the transition between single-head and double-headed screw blocks typically uses a transition ring structure (such as...). Figure 3 As shown), the following defects exist:

[0003] Functional defects: The transition ring is 5-10mm long, with an outer diameter equal to the minor diameter of the threaded block, and has no thread lead. Material conveying stagnation creates a dead zone, leading to localized overheating and carbonization. This results in black spots, yellowing, and other property degradation and defects in the finished product, potentially causing product scrap. Furthermore, the carbonized material in the dead zone is difficult to clean, causing problems when replacing the screw assembly. (Experiments show that the risk of carbonization increases 8 times when the barrel temperature reaches 280℃.)

[0004] Mechanical reliability defects: Exposed threaded block tips cause stress concentration, leading to accelerated crack propagation at the threaded block root. The tips are extremely prone to wear and even breakage. (Once large fragments of the threaded block appear, they could potentially damage the entire extrusion system.) Simultaneously, the ring itself is thinner and shorter than a normal threaded block, resulting in uneven stress and subsequent breakage.

[0005] Space efficiency defects: The transition ring area lacks conveying and meshing functions, and the material flow velocity decreases in the transition area. Effective processing length loss corresponds to the length of the transition area (calculated as 2-3.2 screw pitch lengths for a 40mm L / D screw).

[0006] Phase alignment issue: Due to the double-ended threaded block, the phase difference between the two screws is 90 degrees, while that of the single-ended threaded block is 0 degrees, and the transition ring has no phase locking function. Operators are prone to making mistakes when converting from double-ended to single-ended and vice versa, leading to incorrect installation and potentially damaging the screws. Utility Model Content

[0007] This application provides a seamless threaded block adapter structure for a co-rotating parallel twin-screw extruder, enabling gapless transfer between single-start and double-start threaded blocks. This also simplifies the assembly process and extends service life.

[0008] This application provides a seamless threaded block adapter structure, including an adapter assembly composed of a 0° adapter plate and a 90° adapter plate. The 0° adapter plate is connected to a single-headed threaded block, and the 90° adapter plate is connected to a double-headed threaded block. The two are phase-matched through complementary angles to eliminate dead zones in material conveying.

[0009] In the seamless threaded block adapter structure provided according to at least one embodiment of the present disclosure, the thickness of the 0° adapter plate and the 90° adapter plate is equal to the thickness of the meshing block side block, the gap on both sides is consistent with the gap between the meshing block pieces, and the whole constitutes a continuous meshing surface.

[0010] In the seamless threaded block adapter structure provided according to at least one embodiment of the present disclosure, the end face of the 0° adapter plate is provided with a positioning pin hole, and the corresponding position of the 90° adapter plate is provided with a positioning pin, thereby preventing misalignment during installation through a phase locking structure.

[0011] In the seamless threaded block adapter structure provided according to at least one embodiment of the present disclosure, the adapter component is made of high-strength alloy steel, the surface is nitrided, and its yield strength is ≥800MPa and friction coefficient is ≤0.15.

[0012] In the seamless threaded block adapter structure provided according to at least one embodiment of the present disclosure, the outer diameter of the adapter assembly is the same as the major diameter of the adjacent threaded block, and the inner diameter is the same as the minor diameter of the adjacent threaded block.

[0013] In a seamless threaded block adapter structure provided according to at least one embodiment of the present disclosure, the adapter assembly is provided with a phase positioning mark for quickly aligning the phase angles of adjacent threaded blocks.

[0014] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0015] 1. Adopting an approximate interlocking block structure with 0° and 90° transitions eliminates dead zones and improves product quality.

[0016] 2. The thickness of the adapter plate is the same as that of the meshing block, which reduces stress concentration and extends service life.

[0017] 3. Phase markings on the adapter components ensure a 100% installation success rate and reduce assembly time by 60%;

[0018] 4. The length of the adapter component is the same as that of the meshing block, with no additional length loss. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the seamless threaded block adapter structure in an embodiment of this application;

[0020] Figure 2a This is a schematic diagram of the assembly of a single-headed threaded block in an embodiment of this application;

[0021] Figure 2b This is a schematic diagram of the assembly of the double-ended threaded block in an embodiment of this application;

[0022] Figure 3 This is a schematic diagram of a traditional threaded block connection assembly. Detailed Implementation

[0023] This application provides a seamless threaded block adapter structure for a co-rotating parallel twin-screw extruder, enabling gapless transfer between single-start and double-start threaded blocks. This also simplifies the assembly process and extends service life.

[0024] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0025] like Figure 1 As shown in the embodiment of this application, the seamless thread block adapter structure for a co-rotating parallel twin-screw extruder includes an adapter assembly consisting of a 0° adapter 1 and a 90° adapter plate 2. The 0° adapter plate 1 is connected to a single-start thread block 3, and the 90° adapter plate 2 is connected to a double-start thread block 4. The two are phase-matched through complementary angles to eliminate dead zones in material conveying. The phase angle between the 0° adapter plate 1 and the single-start thread block 3 is 0°, and the phase angle between the 90° adapter plate 2 and the double-start thread block 4 is 90°.

[0026] In some embodiments, the thickness of the 0° adapter plate 1 and the 90° adapter plate 2 is equal to the thickness of the meshing block side block, and the gaps on both sides are consistent with the gaps between the meshing block pieces, forming a continuous meshing surface as a whole.

[0027] For example, the 0° adapter plate 1 has a positioning pin hole on its end face, and the 90° adapter plate 1 has a positioning pin at the corresponding position, and the phase locking structure prevents misalignment during installation.

[0028] Furthermore, the outer diameter of the adapter assembly is the same as the major diameter of the adjacent threaded block, and the inner diameter is the same as the minor diameter of the adjacent threaded block.

[0029] The adapter assembly is equipped with phase positioning marks for quickly aligning the phase angles of adjacent threaded blocks.

[0030] In this embodiment, the adapter component is made of high-strength alloy steel with a nitrided surface, and has a yield strength ≥800MPa and a friction coefficient ≤0.15.

[0031] Example 1

[0032] In this embodiment of the application, for two screws, a 0° adapter plate and a 90° adapter plate are used for connection. The 0° adapter plate 1 is connected to the single-head threaded block 3, and the 90° adapter plate 2 is connected to the double-head threaded block 4. The two are phase-matched through complementary angles, eliminating dead zones in material conveying. Figure 1 As shown. Simultaneously, the 0° and 90° angles precisely compensate for the contradiction between the 90° phase difference of the double-ended threaded block and the 0° phase difference of the single-ended threaded block. For example... Figure 1 , Figure 2a and Figure 2b As shown.

[0033] There are 0° and 90° adapter plates available for use in pairs. One side has a 0° adapter and the other side has a 90° adapter, both with a defined phase angle and consistent cross-sectional profile relative to the front and rear threaded blocks, ensuring accurate installation.

[0034] Although preferred embodiments of this disclosure have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this disclosure.

[0035] Obviously, those skilled in the art can make various modifications and variations to this disclosure without departing from the present invention.

[0036] The spirit and scope of this disclosure. Thus, if these modifications and variations of this disclosure fall within the scope of the claims of this disclosure and their equivalents, this disclosure is also intended to include these modifications and variations.

Claims

1. A seamless flight block adapter structure for co-rotating parallel twin screw extruders, characterized by, The adapter assembly consists of a 0° adapter plate and a 90° adapter plate. The 0° adapter plate is connected to a single-headed threaded block, and the 90° adapter plate is connected to a double-headed threaded block. The two are phase-matched through complementary angles to eliminate dead zones in material conveying.

2. The seamless thread block adapter structure of claim 1, wherein, The thickness of the 0° transition plate and the 90° transition plate is equal to the thickness of the meshing block edge block, and the gaps on both sides are consistent with the gaps between the meshing block pieces, forming a continuous meshing surface as a whole.

3. The seamless threaded block adapter structure as described in claim 2, characterized in that, The 0° adapter plate has a positioning pin hole on its end face, and the 90° adapter plate has a positioning pin at the corresponding position. The phase locking structure prevents misalignment during installation.

4. The seamless threaded block adapter structure as described in any one of claims 1 to 3, characterized in that, The adapter component is made of high-strength alloy steel with a nitrided surface. Its yield strength is ≥800MPa and its friction coefficient is ≤0.

15.

5. The seamless threaded block adapter structure as described in claim 1, characterized in that, The outer diameter of the adapter assembly is the same as the major diameter of the adjacent threaded block, and the inner diameter is the same as the minor diameter of the adjacent threaded block.

6. The seamless threaded block adapter structure as described in claim 5, characterized in that, The adapter assembly is equipped with phase positioning marks for quickly aligning the phase angles of adjacent threaded blocks.

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