Asymmetric runner of extruder

Abstract

The asymmetric runner comprises a confluence core pipe body and an annular plate, a runner opening is formed in one side of the confluence core pipe body, a confluence cavity communicated with the runner opening is formed in the confluence core pipe body, a groove is formed in the inner side of the confluence cavity, a rotating shaft is arranged on the inner side of the groove in a sleeved mode, and the annular plate is connected with the rotating shaft in a sleeved mode. Two groups of pressure stabilizing wheels are mounted in the middle of the rotating shaft; through the runner structure of the first concave part and the second concave part which are asymmetrical between the runner opening and the converging cavity, the pressure difference of upper and lower converging of the melt is balanced, converging core filling caused by the vortex phenomenon is avoided, and the melt converging is more stable under the communication of the asymmetrical runner and the converging cavity, so that the melt converging efficiency is improved. And meanwhile, under the cooperation of the pressure stabilizing wheel, the melt is promoted to naturally roll when passing through the pressure stabilizing wheel, the pressure of the melt is further balanced, and the flowing stability of the melt is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of extruders, in particular to an asymmetric flow channel of an extruder. Background Art

[0002] When the counter-rotating twin-screw extruder is running, due to the rotation mode, there is a pressure difference between the upper and lower parts of the confluence core flow channel, resulting in the upper melt pressure being 0.5-1MPa lower than the lower pressure. After the melt enters the circular channel, the upper flow velocity is lower than the lower flow velocity, causing different internal stresses in the upper and lower parts of the product, resulting in a decrease in product performance.

[0003] The authorized patent number CN216635326U discloses an asymmetric flow channel confluence core of a twin-screw extruder. The device mainly uses the main body steel to fill the vortex generated at the confluence core to form a convex part, the vortex phenomenon disappears, and the pressure difference between the upper and lower parts of the confluence core is reduced, and the mechanical properties of the product are improved. When processing PVC products, the problem of confluence core material stoppage is solved and the start-up cycle is extended. The flow channel adopts an upper and lower asymmetric structure, which does not affect the performance and production capacity of the equipment. However, when the device is actually used, it still has the following defects:

[0004] The above patent mainly fills convex parts in the confluence core to reduce the pressure difference between the upper and lower parts of the confluence core. However, when the melt in the confluence core mixes and flows, the melt flow rate pressure in the upper and lower parts is uneven, resulting in different stresses in the flow part of the product. This not only easily causes the confluence core to stop, but also affects the product performance and reduces the controllability of the melt pressure inside the confluence core. Utility Model Content

[0005] The purpose of the utility model is to provide an asymmetric flow channel of an extruder to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an asymmetric flow channel of an extruder, comprising a converging core tube body and an annular plate, a flow channel opening is provided on one side of the converging core tube body, a converging cavity interconnected with the flow channel opening is provided inside the converging core tube body, a groove is provided on the inner side of the converging cavity, and a rotating shaft is sleeved on the inner side of the groove, two sets of stabilizing wheels are installed at the middle position of the rotating shaft, and a first concave portion and a second concave portion with different diameters are provided on one side of the converging core tube body near the flow channel opening.

[0007] Preferably, the first concave portion and the second concave portion have different diameters and are opened at the inner wall of the converging core tube body. The inner sides of the first concave portion and the second concave portion are provided with a concave layer. The preset concave layer structure is utilized to promote pressure balance of the incoming melt, and under the asymmetric flow channel structure, the stability of the pressure balance is further improved.

[0008] Preferably, the two groups of stabilizing wheels are arranged at the flow channel position of the confluence chamber, and the two groups of stabilizing wheels and the rotating shaft rotate inside the confluence chamber. The stabilizing wheels can be used to contact the melt to reduce the pressure difference.

[0009] Preferably, the flow channel opening is connected to the confluence cavity through the asymmetric flow channel of the first concave portion and the second concave portion, and the asymmetric flow channel structure is utilized to improve the stability of melt flow.

[0010] Preferably, one side of the annular plate is provided with two groups of tapered holes interconnected with the flow channel openings to increase the melt conveying efficiency.

[0011] Preferably, the flow channel opening and the tapered hole inside the confluence core tube body are input cavities along the flow direction of the melt, and the input cavity is connected to the confluence cavity and the diameter gradually decreases, thereby improving the efficiency of the melt being transported inwardly in the input cavity and avoiding material stoppage.

[0012] The asymmetric flow channel of the extruder proposed by the utility model has at least the following beneficial effects:

[0013] Through the flow channel structure of the asymmetric first concave portion and the second concave portion between the flow channel opening and the confluence cavity, the pressure difference of the upper and lower confluence of the melt is balanced, thereby avoiding the occurrence of vortex phenomenon that leads to confluence core filling, and the connection between the asymmetric flow channel and the confluence cavity makes the melt confluence more stable. At the same time, with the setting and cooperation of the stabilizing wheel, the melt is encouraged to roll naturally when passing through the stabilizing wheel, thereby further balancing the pressure of the melt, improving the stability of the melt flow, reducing the pressure difference change inside the confluence core, and improving the performance of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional diagram of the utility model;

[0015] Figure 2 It is a front cross-sectional view of the utility model;

[0016] Figure 3 It is a three-dimensional diagram of the pressure stabilizing wheel of the utility model.

[0017] In the figure: 1, confluence core tube body; 2, annular plate; 3, flow channel opening; 4, first concave portion; 5, pressure stabilizing wheel; 6, confluence cavity; 7, rotating shaft; 8, second concave portion. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figure 1-3 , the utility model provides an embodiment: an asymmetric flow channel of an extruder, comprising a converging core tube body 1 and an annular plate 2, a flow channel opening 3 is provided on one side of the converging core tube body 1, a converging cavity 6 interconnected with the flow channel opening 3 is provided inside the converging core tube body 1, a groove is provided on the inner side of the converging cavity 6, and a rotating shaft 7 is sleeved on the inner side of the groove, and two groups of stabilizing wheels 5 are installed at the middle position of the rotating shaft 7, a first concave portion 4 and a second concave portion 8 with different diameters are provided on one side of the converging core tube body 1 near the flow channel opening 3, the flow channel opening 3 is interconnected with the converging cavity 6 through the asymmetric flow channel of the first concave portion 4 and the second concave portion 8, the asymmetric flow channel structure is used to improve the stability of melt flow, and two groups of tapered holes interconnected with the flow channel opening 3 are provided on one side of the annular plate 2 to increase the melt feeding efficiency;

[0020] The first concave portion 4 and the second concave portion 8 have different diameters and are opened at the inner wall of the converging core tube body 1. The inner sides of the first concave portion 4 and the second concave portion 8 are provided with a concave layer. The preset concave layer structure is utilized to promote the pressure balance of the incoming melt, and under the asymmetric flow channel structure, the stability of the pressure balance is further improved.

[0021] Embodiment 1, as Figure 1-2 As shown, two groups of stabilizing wheels 5 are arranged at the flow channel position of the confluence chamber 6, and the two groups of stabilizing wheels 5 and the rotating shaft 7 rotate inside the confluence chamber 6. By utilizing the stabilizing wheels 5 and the rotating shaft 7 to rotate inside the confluence chamber 6, when the melt passes through the confluence chamber 6, the pressure of the passing melt can be balanced through the rolling cooperation of the stabilizing wheels 5, thereby reducing the pressure difference inside the confluence core and improving the product performance.

[0022] Embodiment 2, as Figure 1-2 As shown, the flow channel opening 3 and the tapered hole inside the confluence core tube body 1 are input cavities along the flow direction of the melt, and the input cavity is connected with the confluence cavity 6 and the diameter gradually decreases. The input cavity structure composed of the tapered hole and the flow channel opening 3 is utilized to encourage the melt to enter the output cavity and reduce the pressure difference with the cooperation of the first concave portion 4 and the second concave portion 8, and then the melt is directly output inward to the gradually decreasing confluence cavity 6 for confluence, thereby improving the stability of the melt flow.

[0023] Working principle: In the asymmetric flow channel of this extruder;

[0024] When the melt enters the converging core tube body 1, the output cavity structure of the runner opening 3 promotes the melt to enter the concave layer structure of the first concave portion 4 and the second concave portion 8 preset inside the converging core tube body 1, so that with the cooperation of the asymmetric structure of the first concave portion 4 and the second concave portion 8, the pressure of the entering melt is balanced and input into the converging cavity 6 for converging. When the melt is introduced into the converging cavity 6, it can contact the stabilizing wheel 5, causing the stabilizing wheel 5 to roll under the flow of the melt, rolling the melt, reducing the pressure difference in the converging state of the melt, preventing the occurrence of eddy currents, promoting the stability and balance of melt converging and circulation, avoiding material stoppage, and increasing the precision and quality of extruder products.

[0025] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0026] In the description of the present invention, unless otherwise specified, "multiple" means two or more than two; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms connected and connected should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. An asymmetric flow channel of an extruder, comprising a converging core tube body (1) and an annular plate (2), characterized in that: A flow channel opening (3) is provided on one side of the converging core tube body (1), a converging cavity (6) which is interconnected with the flow channel opening (3) is provided inside the converging core tube body (1), a groove is provided on the inner side of the converging cavity (6), and a rotating shaft (7) is sleeved on the inner side of the groove, two groups of stabilizing wheels (5) are installed at the middle position of the rotating shaft (7), and a first concave portion (4) and a second concave portion (8) with different diameters are provided on one side of the converging core tube body (1) close to the flow channel opening (3).

2. The asymmetric flow channel of an extruder according to claim 1, characterized in that: The first concave portion (4) and the second concave portion (8) have different diameters and are arranged on the inner wall of the converging core tube body (1); a concave surface layer is provided on the inner sides of the first concave portion (4) and the second concave portion (8).

3. The asymmetric flow channel of an extruder according to claim 1, characterized in that: The two groups of stabilizing wheels (5) are arranged at the flow channel position of the merging chamber (6), and the two groups of stabilizing wheels (5) and the rotating shaft (7) are rotatable inside the merging chamber (6).

4. The asymmetric flow channel of an extruder according to claim 1, characterized in that: The flow channel opening (3) is in communication with the confluence cavity (6) through the asymmetric flow channels of the first concave portion (4) and the second concave portion (8).

5. The asymmetric flow channel of an extruder according to claim 1, characterized in that: One side of the annular plate (2) is provided with two groups of tapered holes which are interconnected with the flow channel opening (3).

6. The asymmetric flow channel of an extruder according to claim 5, characterized in that: The flow channel opening (3) and the tapered hole inside the confluence core tube body (1) are input cavities along the flow direction of the melt, and the input cavity is connected to the confluence cavity (6) and the diameter gradually decreases.

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