A twin-screw plastic extruder head

Abstract

The application relates to the technical field of extruder heads, and discloses a double-screw plastic extruder head, which comprises a first head shell arranged at the discharging end of a double-screw plastic extruder, a first die core arranged in the interior of the first head shell and used for the molding of molten plastic, and a plurality of rod bodies equidistantly arranged on the circumferential outer surface of the first die core. The first driving assembly drives the rod bodies to reciprocate and rotate relative to the first die core, the adhesion of the molten plastic to the rod bodies drives the molten plastic on one side of the rod bodies to move into the gap region on the other side, thereby filling the interior of the gap with the molten plastic. The molten plastic segmented by the rod bodies can be timely mixed together again through the arrangement, thereby being recombined before being extruded into pipe material, the internal layer and the gap of the pipe material are ensured to be free of during subsequent pipe material molding, and the quality of the pipe material is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of extruder heads, in particular to a twin-screw plastic extruder head. Background Art

[0002] Twin-screw extruders for plastic pellets are primarily used for melt blending and modification of one or more plastic pellets. The twin screws rotate in the same or opposite directions to heat and melt the plastic pellets, promoting various chain reactions between the melts during melt flow and simultaneously achieving melt processing and molding of the plastics. The extruder head is used for melt processing and molding of plastics.

[0003] A mold core is fixedly installed inside the existing extruder head. The molten plastic forms a tube after passing through the mold core. The mold core is fixed between the inner walls of the extruder head by multiple connecting rods. When the molten plastic passes through the rod body, it will be blocked by the rod body, thereby dividing the molten plastic into gaps. When the divided molten plastic subsequently comes out of the discharge port of the head, it cannot be quickly re-mixed and combined together, resulting in interlayers and gaps in the plastic inside the extruded tube, affecting the quality of the tube. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a twin-screw plastic extruder head.

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

[0006] A twin-screw plastic extruder head, comprising:

[0007] A first die housing is provided at the discharge end of the twin-screw plastic extruder;

[0008] a first mold core, which is disposed inside the first head housing and is used for molding molten plastic;

[0009] A plurality of rods are equidistantly arranged on the outer circumference of the first mold core, and are used to connect the first mold core to the inner wall of the first head shell. The plurality of rods are configured to be able to rotate back and forth relative to the first mold core.

[0010] a first ring disposed on the outer circumferential surface of the first mold core;

[0011] The second ring is arranged on the outer circumferential surface of the first mold core, and the first ring and the second ring are arranged to be able to rotate back and forth relative to the first mold core.

[0012] As a further solution of the present invention, a second head shell is fixedly mounted on one end of the first head shell, and ends of the plurality of rods that are away from each other penetrate the outer surfaces of the first head shell and the second head shell.

[0013] As a further solution of the present invention, the outer surface of the first head housing is provided with a first driving assembly that drives the rod body to rotate back and forth, and the first driving assembly includes:

[0014] A first end face gear is sleeved on the outer circumferential surface of the first head housing, and the first end face gear is rotatably mounted on the first head housing;

[0015] A plurality of first gears are respectively fixedly mounted on ends of a plurality of rods that are away from each other, and the plurality of first gears are all meshed with the first end face gear.

[0016] As a further solution of the present invention, an outlet is provided at the other end of the second head housing, a second mold core is provided between inner walls of the outlet, and one end of the second mold core is fixedly connected to the first mold core.

[0017] As a further solution of the present invention, the first ring and the second ring are sleeved on the circumferential outer surface of the first mold core, the first ring and the second ring are both rotatably mounted with the first mold core, and the first ring and the second ring are arranged between the rod body and the second mold core.

[0018] As a further solution of the present invention, a cavity is provided inside the first mold core, and two openings are provided through the circumferential outer surface of the first mold core. Two first columns are fixedly installed on the inner wall of the first ring, and the two first columns are respectively provided inside the two openings and are slidably installed with the inner walls of the openings. Two second columns are fixedly installed on the inner wall of the second ring, and the two second columns are respectively provided inside the two openings and are slidably installed with the inner walls of the openings.

[0019] As a further solution of the present invention, one end of the second mold core passes through the cavity of the first mold core and is rotatably mounted with a mounting shaft. A second driving assembly is provided inside the cavity of the first mold core to drive the first ring and the second ring to rotate back and forth. The second driving assembly includes:

[0020] The second end face gear is arranged inside the cavity and fixedly mounted on the other end of the mounting shaft;

[0021] A third end face gear is disposed inside the cavity, and the mounting shaft penetrates the outer surface of the third end face gear and is rotatably mounted therewith;

[0022] A plurality of second gears are arranged inside the cavity and located between the second end face gear and the third end face gear. The plurality of second gears are respectively engaged with the second end face gear and the third end face gear. The ends of the plurality of rods close to each other all pass through the inner wall of the cavity of the first mold core and are fixedly connected to the rotation center of the plurality of second gears.

[0023] As a further solution of the present invention, one end of the two first columns close to each other passes through the opening and is fixedly connected to the circumferential outer surface of the mounting shaft.

[0024] As a further solution of the present invention, one end of the two second columns close to each other passes through the opening and is fixedly mounted on the circumferential outer surface of the third end face gear.

[0025] As a further solution of the present invention, the first mold core is configured to be spindle-shaped.

[0026] The present application drives the rod body to rotate back and forth relative to the first mold core through the first drive assembly, so that the molten plastic on one side of the rod body is driven to move to the gap area on the other side through the adhesion of the rod body to the molten plastic, thereby filling the interior of the gap with the molten plastic. Through this arrangement, the molten plastic separated by the rod body can be mixed together again in time, so as to be recombined before being extruded into a tube material, ensuring that there are no interlayers and gaps inside the subsequent tube material during molding, thereby ensuring the quality of the tube material. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the overall structure of a twin-screw plastic extruder head proposed by the present invention;

[0028] Figure 2 This is a rear structural schematic diagram of a twin-screw plastic extruder head proposed by the present invention;

[0029] Figure 3 This is a schematic diagram of the exploded structure of a twin-screw plastic extruder head proposed by the present invention;

[0030] Figure 4 This is a schematic diagram of the internal structure of a twin-screw plastic extruder head proposed by the present invention;

[0031] Figure 5 This is a cross-sectional schematic diagram of a twin-screw plastic extruder head proposed by the present invention;

[0032] Figure 6 This is a schematic diagram of the first mold core of a twin-screw plastic extruder die head proposed by the present invention;

[0033] Figure 7 This is a schematic cross-sectional view of a first mold core of a twin-screw plastic extruder die head proposed by the present invention;

[0034] Figure 8 This is a schematic diagram of the second mold core of a twin-screw plastic extruder die head proposed by the present invention;

[0035] Figure 9 This is a schematic diagram of the first ring of a twin-screw plastic extruder head proposed by the present invention;

[0036] Figure 10 This is a schematic diagram of the second ring of a twin-screw plastic extruder head proposed by the present invention;

[0037] Figure 11 Figure I in the middle is a schematic diagram of a stationary state of the rod body of a twin-screw plastic extruder die head proposed by the present invention;

[0038] Figure 11 Figure II is a schematic diagram of the rotating state of the rod body of the twin-screw plastic extruder head proposed by the present invention.

[0039] In the picture:

[0040] 100. First nose housing;

[0041] 200, second nose housing;

[0042] 300, first mold core; 310, opening;

[0043] 400, rod body;

[0044] 500, second mold core; 510, installation shaft;

[0045] 600, first drive assembly; 610, first end gear; 620, first gear;

[0046] 700, first ring; 710, first pillar;

[0047] 800, second ring; 810, second column;

[0048] 900, second drive assembly; 910, second end face gear; 920, third end face gear; 930, second gear. DETAILED DESCRIPTION

[0049] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0050] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0052] After the existing extruder head extrudes the tube material, the material inside the tube material will have interlayers and gaps. Operators have found in long-term work that this is because the connecting rod that fixes the mold core separates the molten plastic. Figure 11 As shown in Figure Ⅰ, gaps are formed between the molten plastics. To solve this problem, Figure 1 and Figure 4 As shown, the present application discloses a twin-screw plastic extruder head, comprising: a first head shell 100, a first mold core 300, a plurality of rod bodies 400 and a first drive assembly 600. The extruder head is fixedly connected to the discharge end of the twin-screw plastic extruder through the first head shell 100, so that the molten plastic extruded from the extruder enters the interior of the first head shell 100. Since the first mold core 300 is arranged inside the first head shell 100, and a plurality of rod bodies 400 are equidistantly arranged on the circumferential outer surface of the first mold core 300, the first mold core 300 and the inner wall of the first head shell 100 are connected by the plurality of rod bodies 400, so that the first mold core 300 is fixed in the middle position inside the first head shell 100, and then the molten plastic inside the first head shell 100 is extruded into a tube material through the first mold core 300 (the specific extrusion is described in detail below), as shown in FIG. Figure 11 As shown in Figure II, because the plurality of rods 400 are configured to be able to rotate back and forth relative to the first mold core 300, and the first drive assembly 600 is provided on the outer surface of the first head housing 100, for driving the rods 400 to rotate back and forth, when the first drive assembly 600 drives the rods 400 to rotate back and forth relative to the first mold core 300, the molten plastic on one side of the rods 400 can be driven to move to the gap area on the other side through the adhesion of the rods 400 to the molten plastic, thereby filling the interior of the gap with the molten plastic, as shown in FIG. Figure 11 As shown in Figure II, the gap area on the other side of the rod body 400 is greatly reduced, so that the molten plastic can be quickly recombined during subsequent molding. Through this arrangement, the molten plastic separated by the rod body 400 can be mixed together again in time, and thus recombined before being extruded into a tube material, ensuring that there are no interlayers and gaps inside the subsequent tube material during molding, thereby ensuring the quality of the tube material.

[0053] In order to facilitate the rod body 400 to fix the first mold core 300 in the middle position inside the first head shell 100, as shown in FIG. Figure 3 As shown, a second head shell 200 is fixedly installed at one end of the first head shell 100, and the first head shell 100 and the second head shell 200 are fixedly connected to each other, clamping several rod bodies 400 between the two. It should be noted that the contact surfaces between the first head shell 100, the second head shell 200 and the rod body 400 need to be sealed to avoid leakage of molten plastic.

[0054] In order to enable the first driving assembly 600 to drive the plurality of rods 400 to rotate back and forth relative to the first mold core 300, as shown in FIG. Figure 2 As shown, the first drive assembly 600 includes: a first end face gear 610 and a plurality of first gears 620. The first end face gear 610 is sleeved on the circumferential outer surface of the first head housing 100, and the first end face gear 610 is rotatably mounted with the first head housing 100. A pulley is provided on the other end face of the first end face gear 610, and the pulley is connected to the pulley on the output end of the drive motor through a belt, and then the first end face gear 610 is driven by the drive motor to rotate back and forth. Since the ends of the plurality of rod bodies 400 that are away from each other all penetrate the outer surfaces of the first head housing 100 and the second head housing 200, the plurality of first gears 620 are fixedly mounted on the ends of the plurality of rod bodies 400 that are away from each other, and the plurality of first gears 620 are all meshed with the first end face gear 610. The first end face gear 610 drives the plurality of rod bodies 400 to rotate back and forth through the first gear 620, so that the rod bodies 400 can drive the molten plastic to be melted by the adhesion of their surfaces to the molten plastic. Figure 11 The gap in Figure Ⅰ is filled with molten plastic, as shown in Figure 11 As shown in Figure II, the gap area is greatly reduced.

[0055] In order to make the molten plastic be extruded to form a tube, Figure 5 and Figure 6 As shown, the other end of the second head housing 200 is provided with an outlet, and a second mold core 500 is provided between the inner walls of the outlet. The first mold core 300 is arranged in a spindle shape, and one end of the second mold core 500 is fixedly connected to the first mold core 300. The fixed connection can be connected by a threaded connection to facilitate subsequent disassembly and assembly. Figure 5 As shown, the outer shape of the tube is formed by the second mold core 500 and the inner wall of the outlet of the second head shell 200. When the molten plastic is squeezed out from between the two, the outer shape of the tube is formed.

[0056] In order to mix the molten plastic brought out by the rotation of the rod body 400 as quickly as possible, Figure 6 and Figure 7As shown, the circumferential outer surface of the first mold core 300 is sleeved with a first ring 700 and a second ring 800, and the first ring 700 and the second ring 800 are both rotatably installed with the first mold core 300. The first ring 700 and the second ring 800 are arranged between the rod body 400 and the second mold core 500. The first ring 700 and the second ring 800 are higher than the circumferential outer surface of the first mold core 300. When the molten plastic brought out by the rotation of the rod body 400 is blocked by the first ring 700 and the second ring 800 at the first time, the speed of the molten plastic flowing through the first ring 700 and the second ring 800 is slowed down, and then the molten plastic is mixed as quickly as possible through the rotation of the first ring 700 and the second ring 800.

[0057] In order to limit the positions of the first ring 700 and the second ring 800 on the outer circumferential surface of the first mold core 300, as shown in FIG. Figure 8 As shown, a cavity is provided inside the first mold core 300, and two openings 310 are provided through the circumferential outer surface of the first mold core 300. Two first columns 710 are fixedly installed on the inner wall of the first ring 700, and the two first columns 710 are respectively provided inside the two openings 310 and slidably installed with the inner walls of the openings 310. Two second columns 810 are fixedly installed on the inner wall of the second ring 800, and the two second columns 810 are respectively provided inside the two openings 310 and slidably installed with the inner walls of the openings 310. The first ring 700 and the second ring 800 are respectively restricted on the circumferential outer surface of the first mold core 300 by the two first columns 710 and the two second columns 810. It should be noted that the first ring 700 and the second ring 800 completely block the opening 310 to prevent the molten plastic from entering the cavity of the first mold core 300 from the opening 310.

[0058] Specifically, in order to enable the first ring 700 and the second ring 800 to rotate, as shown in FIG. Figure 7 and Figure 8As shown, one end of the second mold core 500 passes through the cavity of the first mold core 300 and is rotatably installed with an installation shaft 510. A second driving assembly 900 is provided inside the cavity of the first mold core 300 to drive the first ring 700 and the second ring 800 to rotate back and forth. The second driving assembly 900 includes: a second end face gear 910, a third end face gear 920 and several second gears 930. Because the plurality of second gears 930 are arranged inside the cavity and are located between the second end face gear 910 and the third end face gear 920, and the plurality of second gears 930 are respectively engaged with the second end face gear 910 and the third end face gear 920, and because the ends of the plurality of rod bodies 400 close to each other all pass through the inner wall of the cavity of the first mold core 300 and are fixedly connected to the rotation center of the plurality of second gears 930, when the plurality of rod bodies 400 rotate back and forth, they will drive the second end face gear 910 and the third end face gear 920 to rotate back and forth, and the rotation directions of the second end face gear 910 and the third end face gear 920 are opposite in real time, such as Figure 9 and Figure 10 As shown, since the second end face gear 910 is arranged inside the cavity and is fixedly installed with the other end of the installation shaft 510, the third end face gear 920 is arranged inside the cavity, and the installation shaft 510 passes through the outer surface of the third end face gear 920 and is rotatably installed therewith, when the second end face gear 910 and the third end face gear 920 rotate back and forth, the second end face gear 910 can drive the installation shaft 510 to rotate, and because the ends of the two first columns 710 close to each other pass through the opening 310 and are fixedly connected to the circumferential outer surface of the installation shaft 510, and the ends of the two second columns 810 close to each other pass through The through opening 310 is fixedly mounted on the circumferential outer surface of the third end face gear 920. When the second end face gear 910 drives the mounting shaft 510 to rotate, the two first columns 710 drive the first ring 700 to rotate back and forth. When the third end face gear 920 rotates, the two second columns 810 drive the second ring 800 to rotate back and forth. Through this arrangement, when the rod body 400 rotates and drives the molten plastic into the gap position on the other side of the rod body 400, the opposite and staggered rotation of the first ring 700 and the second ring 800 pulls and mixes the molten plastic so that the cut surfaces can be combined as soon as possible.

[0059] It should be noted that in the present application, the rod body 400, the first ring 700 and the second ring 800 all rotate back and forth. Through this arrangement, the rod body 400, the first ring 700 and the second ring 800 are prevented from tearing the molten plastic when they rotate continuously in one direction due to the adhesion of the rod body 400, the first ring 700 and the second ring 800 to the molten plastic, so that small interlayers and gaps are formed inside the molten plastic. At the same time, the speed of the reciprocating rotation of the rod body 400, the first ring 700 and the second ring 800 can be adjusted. When the molten plastic is more viscous, the rotation speed of the rod body 400, the first ring 700 and the second ring 800 is slower to avoid strong pulling and tearing, which causes interlayers and gaps to be formed inside the molten plastic. The speed can be adjusted by adjusting the speed of the external drive motor.

[0060] The basic principles, main features and advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A twin-screw plastic extruder head, characterized in that, include: A first die housing (100) is provided at the discharge end of the twin-screw plastic extruder; a first mold core (300) disposed inside the first head housing (100) and used for molding molten plastic; A plurality of rods (400) are equidistantly arranged on the circumferential outer surface of the first mold core (300) and are used to connect the first mold core (300) and the inner wall of the first head shell (100); the plurality of rods (400) are configured to be capable of reciprocating rotation relative to the first mold core (300); a first ring (700) disposed on the outer circumferential surface of the first mold core (300); A second ring (800) is arranged on the outer circumferential surface of the first mold core (300), wherein the first ring (700) and the second ring (800) are arranged to be able to rotate back and forth relative to the first mold core (300); the first ring (700) and the second ring (800) are coaxial and rotate in opposite directions; The second head housing (200) is fixedly mounted on one end of the first head housing (100), and the ends of the plurality of rod bodies (400) that are away from each other penetrate the outer surfaces of the first head housing (100) and the second head housing (200). The outer surface of the first head housing (100) is provided with a first driving assembly (600) for driving the rod bodies (400) to rotate back and forth. The first driving assembly (600) includes: a first end face gear (610) sleeved on the outer circumferential surface of the first head housing (100), the first end face gear (610) being rotatably mounted on the first head housing (100); A plurality of first gears (620) are respectively fixedly mounted on ends of the plurality of rods (400) that are away from each other, and the plurality of first gears (620) are all meshed with the first end face gear (610); An outlet is provided at the other end of the second head housing (200), and a second mold core (500) is provided between the inner walls of the outlet. One end of the second mold core (500) is fixedly connected to the first mold core (300). The first ring (700) and the second ring (800) are sleeved on the circumferential outer surface of the first mold core (300). The first ring (700) and the second ring (800) are both rotatably mounted on the first mold core (300). The first ring (700) and the second ring (800) are provided between the rod body (400) and the second mold core (500).

2. The twin-screw plastic extruder head according to claim 1, characterized in that: A cavity is provided inside the first mold core (300), and two openings (310) are provided through the circumferential outer surface of the first mold core (300). Two first columns (710) are fixedly installed on the inner wall of the first ring (700), and the two first columns (710) are respectively arranged inside the two openings (310) and slidably installed with the inner walls of the openings (310). Two second columns (810) are fixedly installed on the inner wall of the second ring (800), and the two second columns (810) are respectively arranged inside the two openings (310) and slidably installed with the inner walls of the openings (310).

3. The twin-screw plastic extruder head according to claim 2, characterized in that: One end of the second mold core (500) passes through the cavity of the first mold core (300) and is rotatably mounted with a mounting shaft (510). A second driving assembly (900) is provided inside the cavity of the first mold core (300) to drive the first ring (700) and the second ring (800) to rotate back and forth. The second driving assembly (900) includes: A second end face gear (910) is disposed inside the cavity and fixedly mounted on the other end of the mounting shaft (510); A third end face gear (920) is disposed inside the cavity, and the mounting shaft (510) passes through the outer surface of the third end face gear (920) and is rotatably mounted thereon; A plurality of second gears (930) are arranged inside the cavity and located between the second end face gear (910) and the third end face gear (920), and the plurality of second gears (930) are respectively engaged with the second end face gear (910) and the third end face gear (920). The ends of the plurality of rods (400) that are close to each other all pass through the inner wall of the cavity of the first mold core (300) and are fixedly connected to the rotation centers of the plurality of second gears (930).

4. The twin-screw plastic extruder head according to claim 3, characterized in that: One end of the two first columns (710) that is close to each other passes through the opening (310) and is fixedly connected to the circumferential outer surface of the mounting shaft (510).

5. The twin-screw plastic extruder head according to claim 4, characterized in that: One end of the two second columns (810) that is close to each other passes through the opening (310) and is fixedly mounted on the circumferential outer surface of the third end face gear (920).

6. The twin-screw plastic extruder head according to claim 1, characterized in that: The first mold core (300) is configured in a spindle shape.

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