An extrusion device and an extrusion apparatus

Abstract

The application discloses an extruding device and an extruding equipment, and the extruding device comprises a cylinder and a screw rod, the screw rod is arranged in the cylinder and can rotate in the cylinder, the screw rod is provided with a main screw ridge, a first auxiliary screw ridge, a second auxiliary screw ridge and a plurality of mixing baffles, the first auxiliary screw ridge is connected with the main screw ridge to form a first auxiliary screw groove and a first collecting groove, the second auxiliary screw ridge is connected with the main screw ridge to form a second auxiliary screw groove and a second collecting groove, the first collecting groove and the second collecting groove are semi-opened, which is beneficial to increasing the flowability of the melt relative to the solid bed residue, enhancing the transverse circulation perpendicular to the first collecting groove and the second collecting groove, and enabling the unmelted solid bed residue to quickly enter the first collecting groove and the second collecting groove, and the solid bed residue can be quickly melted through the continuous extrusion of the first auxiliary screw ridge and the second auxiliary screw ridge, and then pass through the mixing baffles of the metering area, so that the screw rod can smoothly melt, mix and extrude at a high rotating speed.

Description

Technical Field

[0001] This invention relates to the field of extrusion equipment manufacturing technology, and in particular to an extrusion apparatus and an extrusion device. Background Technology

[0002] In related technologies, single-screw mechanisms are commonly used extrusion mechanisms. Currently, commonly used types include pin screws, corrugated screws, cavitation transfer mixers, and split screws. However, traditional split screws use a forced compression method to forcibly separate the solid bed and the molten pool. This does not take into account the leakage between the screw and barrel, the molten pool caused by the screw drag surface, or the problem of solid bed rupture in the later stage of melting. Furthermore, traditional split screws have poor adaptability to different material systems and screw speeds, especially in the inadequate handling of residues after solid bed rupture in the later stage of melting. This makes them unsuitable for high-speed extrusion processes and prevents the screw from successfully melting, mixing, and extruding at high speeds. Summary of the Invention

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an extrusion device in which the first and second collecting tanks are semi-open. In this case, the fluidity of the melt relative to the solid bed residue enhances the lateral circulation perpendicular to the first and second collecting tanks. While accelerating the flow of the melt, it also allows the unmelted solid bed residue to quickly enter the first and second collecting tanks. The unmelted solid bed residue can be rapidly melted by the continuous extrusion of the first and second screw ribs, and then passes through the mixing baffle in the metering zone, thereby realizing the smooth melting, mixing and extrusion of the screw at high speed.

[0004] Secondly, the present invention also proposes an extrusion apparatus that utilizes the above-described extrusion device.

[0005] An extrusion apparatus according to a first aspect of the present invention includes: a barrel and a screw, wherein the screw is disposed within the barrel;

[0006] The screw is equipped with a conveying section, a melting section, and a metering section;

[0007] The main spiral ridge extends spirally along the outer peripheral wall of the screw and crosses the conveying section, the melting section, and the metering section;

[0008] The first secondary screw rib is disposed on the outer wall of the screw and extends from the conveying section to the melting section. The first secondary screw rib is connected with the main screw rib to form a first secondary screw groove and a first collecting groove that are interconnected. At the first collecting groove, the first secondary screw rib is provided with a plurality of first notches at intervals.

[0009] The second sub-screw rib is arranged on the outer wall of the screw rod and extends from the conveying section to the melting section, and the second sub-screw rib is connected with the main screw rib to form second sub-screw grooves and a second collection groove in communication with each other, and a plurality of second gaps are arranged at the second collection groove.

[0010] A plurality of mixing baffles are arranged at intervals on the outer wall of the screw rod and located in the metering section.

[0011] According to the extrusion device provided by the first aspect of the present application, the first sub-screw rib and the second sub-screw rib start or end at the main screw rib, the first sub-screw rib and the trailing and thrust surfaces of the main screw rib form a first sub-screw groove and a first collection groove, the first collection groove is located at the rear side of the first sub-screw groove, the second sub-screw rib and the trailing and thrust surfaces of the main screw rib form a second sub-screw groove and a second collection groove, the second collection groove is located at the rear side of the second sub-screw groove, the first sub-screw groove and the first collection groove combine to form a first melt pool, the second sub-screw groove and the second collection groove combine to form a second melt pool, and the double-melt-pool structure is beneficial to rapid melting of the material; during operation, the screw rod rotates, the material first falls into the first sub-screw groove and the second sub-screw groove of the conveying section and is extruded to form a solid bed, the first sub-screw rib and the second sub-screw rib cooperate to realize compaction and advancement of the solid bed, and then the solid bed enters the melting section to be melted to form solid bed residues and melt, the melt flows out from the gap between the screw rod and the barrel, since a plurality of first gaps are arranged on the first sub-screw rib at the first collection groove and a plurality of second gaps are arranged on the second sub-screw rib at the second collection groove, the first collection groove and the second collection groove are semi-open, at this time, the flowability of the melt relative to the solid bed residues enhances the transverse circulation perpendicular to the first collection groove and the second collection groove, accelerates the flow of the melt, and also enables the unmelted solid bed residues to quickly enter the first collection groove and the second collection groove, the unmelted solid bed residues can be quickly melted through the continuous extrusion of the first sub-screw rib and the second sub-screw rib, and then pass through the mixing baffles in the metering section, thereby realizing smooth melting, mixing and extrusion of the screw rod at a high rotation speed.

[0012] According to the extrusion device provided by the first aspect of the present application, a plurality of primary material collection baffles are arranged at intervals in the melting section of the screw rod, and the primary material collection baffles are arranged at the first gaps and the second gaps.

[0013] According to the extrusion device provided by the first aspect of the present application, the cross section of the primary material collection baffle is wedge-shaped.

[0014] According to the extrusion device provided by the first aspect of the present application, a plurality of secondary material collection baffles are arranged at intervals in the metering section of the screw rod, and the secondary material collection baffles are located at the side edges of the mixing baffles.

[0015] According to the extrusion device provided by the embodiment of the first aspect of the present application, the angle between the primary material collecting baffle and the axis of the screw decreases along the direction from the conveying section to the metering section.

[0016] According to the extrusion device provided by the embodiment of the first aspect of the present application, the angle between the secondary material collecting baffle and the axis of the screw is greater than the angle between the primary material collecting baffle and the axis of the screw.

[0017] According to the extrusion device provided by the embodiment of the first aspect of the present application, the gap between the inner wall of the cylinder and the outer end surface of the main screw rib is 0.05mm to 0.5mm.

[0018] According to the extrusion device provided by the embodiment of the first aspect of the present application, the height of the first auxiliary screw rib and the second auxiliary screw rib is 0.5 to 0.99 times the height of the main screw rib.

[0019] According to the extrusion device provided by the embodiment of the first aspect of the present application, the outer wall of the cylinder is provided with exhaust holes.

[0020] According to the extrusion device provided by the embodiment of the first aspect of the present application, the outer wall of the cylinder is provided with exhaust holes.

[0021] According to the extrusion device provided by the embodiment of the first aspect of the present application, the outer wall of the cylinder is provided with exhaust holes.

[0022] Additional aspects and advantages of the present application will be made apparent by the following description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] Additional aspects and advantages of the present application will be made apparent by the following description and the accompanying drawings.

[0024] Figure 1A structure diagram of a screw and a barrel of an extrusion device according to an embodiment of the first aspect of the present application is provided as follows;

[0025] Figure 2 A structure diagram of a screw of an extrusion device according to an embodiment of the first aspect of the present application is provided as follows;

[0026] Figure 3 A development diagram of an extrusion device according to an embodiment of the first aspect of the present application is provided as follows;

[0027] Figure 4 A structure diagram of a primary material collecting baffle and a secondary material collecting baffle of an extrusion device according to an embodiment of the first aspect of the present application is provided as follows;

[0028] Figure 5 A structure diagram of a primary material collecting baffle and a secondary material collecting baffle of an extrusion device according to an embodiment of the first aspect of the present application is provided as follows; Figure 3 A sectional view at D-D.

[0029] The reference signs are as follows:

[0030] Barrel 100; vent hole 110;

[0031] Screw 200; primary screw flight 210; first secondary screw flight 220; first secondary screw groove 221; first collecting groove 222; first gap 223; second secondary screw flight 230; second secondary screw groove 231; second collecting groove 232; second gap 233; mixing baffle 240; primary material collecting baffle 250; secondary material collecting baffle 260. DETAILED DESCRIPTION

[0032] Embodiments of the present application are described in detail below with reference to the accompanying drawings, in which the same or similar components have the same or similar reference numbers throughout the drawings and a detailed description of the embodiments is given below by referring to the accompanying drawings. The embodiments described below are merely examples for explaining the present application and should not be construed as limiting the present application.

[0033] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings and is only for the convenience of describing the present application and simplifying the description, and therefore should not be construed as indicating or implying that the device or component referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present application.

[0034] In the description of the present application, if there is a description of first, second, etc. for the purpose of distinguishing technical features, it should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the sequence of technical features indicated.

[0035] In the description of the present application, the words such as arrangement, installation, connection and the like should be understood in a broad sense unless otherwise explicitly limited, and the skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0036] In the related art, single screw mechanism is a commonly used extrusion mechanism, and currently commonly used ones include pin screw, wave screw, cavity transfer mixer, and split screw, etc., but the traditional split screw adopts a forced compression solid bed mode, and forcibly separates the solid bed and the melt pool, and in this process, the gap leakage between the screw barrels and the melt pool generated by the screw drag surface are not considered, and the problem of solid bed rupture in the late melting stage is also not considered, thereby causing the extrusion mechanism to be unable to smoothly melt and mix extrusion of the screw at high speed.

[0037] To solve this problem, the first aspect embodiment of the present application provides an extrusion device, the first sub-screw groove 221 and the first collection groove 222 on the screw 200 of the extrusion equipment are combined into a first melt pool, the second sub-screw groove 231 and the second collection groove 232 are combined into a second melt pool, and the double-melt pool structure is beneficial to rapid melting of the material; since the first sub-screw rib 220 at the first collection groove 222 is provided with a plurality of first notches 223, the second sub-screw rib 230 of the second collection groove 232 is provided with a plurality of second notches 233, and the first collection groove 222 and the second collection groove 232 are semi-open, at this time, the flowability of the melt relative to the solid bed residue enhances the transverse circulation perpendicular to the first collection groove 222 and the second collection groove 232, accelerates the flow of the melt, and also enables the un-melted solid bed residue to quickly enter the first collection groove 222 and the second collection groove 232, and the un-melted solid bed residue can be quickly melted through the continuous extrusion of the first sub-screw rib 220 and the second sub-screw rib 230, and then passes through the mixing baffle 240 of the metering area, thereby realizing smooth melt and mix extrusion of the screw 200 at high speed, and the specific structure and function of the extrusion device provided by the embodiment of the present application will be further described below in combination with the text and the drawings.

[0038] Referring to Figures 1 to 5 , the extrusion device provided by the first aspect embodiment of the present application comprises: a barrel 100 and a screw 200, the screw 200 is arranged in the barrel 100 and can rotate in the barrel 100; the screw 200 is provided with a main screw rib 210, a first sub-screw rib 220, a second sub-screw rib 230, and a plurality of mixing baffles 240; referring to Figure 3 and Figure 4The conveying section A, the melting section B and the metering section C are sequentially arranged along the conveying direction of the screw 200. The main screw rib 210 spirally extends along the outer wall of the screw 200 and crosses the conveying section A, the melting section B and the metering section C. The first auxiliary screw rib 220 is arranged on the outer wall of the screw 200 and extends from the conveying section to the melting section B. The first auxiliary screw rib 220 is connected with the main screw rib 210 to form the first auxiliary screw groove 221 and the first collection groove 222 which are in communication with each other. The first auxiliary screw rib 220 is provided with a plurality of first notches 223 at the first collection groove 222. The second auxiliary screw rib 230 is arranged on the outer wall of the screw 200 and extends from the conveying section to the melting section B. The second auxiliary screw rib 230 is connected with the main screw rib 210 to form the second auxiliary screw groove 231 and the second collection groove 232 which are in communication with each other. The second auxiliary screw rib 230 is provided with a plurality of second notches 233 at the second collection groove 232. A plurality of mixing baffles 240 are arranged on the outer wall of the screw 200 and located in the metering section C.

[0039] According to the extrusion device provided by the first aspect of the present application, the first auxiliary screw rib 220 and the second auxiliary screw rib 230 start or end at the main screw rib 210. The first auxiliary screw rib 220 and the main screw rib 210 form the first auxiliary screw groove 221 and the first collection groove 222 between the trailing and thrust surfaces. The first collection groove 222 is located at the rear side of the first auxiliary screw groove 221. The second auxiliary screw rib 230 and the main screw rib 210 form the second auxiliary screw groove 231 and the second collection groove 232 between the trailing and thrust surfaces. The second collection groove 232 is located at the rear side of the second auxiliary screw groove 231. The first auxiliary screw groove 221 and the first collection groove 222 combine to form the first melt pool. The second auxiliary screw groove 231 and the second collection groove 232 combine to form the second melt pool. The double-melt-pool structure is beneficial to the rapid melting of the material. Figure 5, the middle block-shaped object is a solid bed, the screw 200 rotates, the material first falls into the first sub-screw groove 221 and the second sub-screw groove 231 of the conveying section A and is extruded to form a solid bed, the first sub-screw rib 220 and the second sub-screw rib 230 cooperate to realize compaction and advancement of the solid bed, and then the solid bed enters the melting section B to form a solid bed residue and a melt, the melt flows out from the gap between the screw 200 and the cylinder 100, since the first sub-screw rib 220 at the first collection groove 222 is provided with a plurality of first notches 223, the second sub-screw rib 230 of the second collection groove 232 is provided with a plurality of second notches 233, and the first collection groove 222 and the second collection groove 232 are semi-open, at this time, the flowability of the melt relative to the solid bed residue enhances the transverse circulation perpendicular to the first collection groove 222 and the second collection groove 232, accelerates the flow of the melt, and also enables the unmelted solid bed residue to quickly enter the first collection groove 222 and the second collection groove 232, the unmelted solid bed residue can be quickly melted through the continuous extrusion of the first sub-screw rib 220 and the second sub-screw rib 230, and then passes through the mixing baffle 240 of the metering section, so that the screw 200 smoothly melts, mixes and extrudes at a high speed.

[0040] Referring to Figures 3 to 5 , according to the extrusion device provided by the first aspect of the present application, a plurality of primary material collection baffles 250 are arranged at intervals in the melting section B of the screw 200, the plurality of primary material collection baffles 250 are arranged adjacently and extend spirally along the outer wall of the screw 200, the primary material collection baffle 250 is located at the first notch 223 of the first collection groove 222 and the second notch 233 of the second collection groove 232, referring to Figure 4 The cooperation of the two adjacent primary material collection baffles 250 forms a wedge-shaped groove, which is conducive to strengthening the transverse circulation effect perpendicular to the first collection groove 222 and the second collection groove 232 and collecting the unmelted solid bed residue in the melt, and is conducive to rapid melting.

[0041] Referring to Figure 4 , according to the extrusion device provided by the first aspect of the present application, the cross section of the primary material collection baffle 250 arranged at the first notch 223 and the second notch 233 is wedge-shaped, and the wedge-shaped structure is conducive to extruding the solid bed residue to accelerate the melting speed of the solid bed residue.

[0042] According to the extrusion device provided by the first aspect of the present application, a plurality of secondary material collection baffles 260 are arranged at intervals in the metering section C of the screw 200, along the conveying direction of the screw 200, the secondary material collection baffle 260 is located behind the primary material collection baffle 250 and at the side of the mixing baffle 240, referring to Figure 4 The cooperation of the two adjacent secondary material collection baffles 260 forms a wedge-shaped groove, which can further collect and extrude the unmelted solid bed residue in the melt and accelerate the melting speed.

[0043] As Figure 4 shown, according to the first aspect of the present application, the angle between the secondary material baffle 260 and the axis of the screw 200 is greater than the angle between the primary material baffle 250 and the axis of the screw 200 along the direction from the conveying section A to the metering section C, as shown in the figure, the angle between the secondary material baffle 260 and the axis of the screw 200 is δ, that is, δ>γ, the wedge-shaped groove formed by the secondary material baffle 260 can collect more solid bed residues that have not yet melted in the melt.

[0044] It should be noted that the number of primary material baffles 250 can be set according to actual needs, which is not limited here.

[0045] According to the first aspect of the present application, the angle between the secondary material baffle 260 and the axis of the screw 200 is greater than the angle between the primary material baffle 250 and the axis of the screw 200 along the direction from the conveying section A to the metering section C, as shown in the figure, the angle between the secondary material baffle 260 and the axis of the screw 200 is δ, that is, δ>γ, the wedge-shaped groove formed by the secondary material baffle 260 can collect more solid bed residues that have not yet melted in the melt. Figure 4

[0046] It should be noted that the number of secondary material baffles 260 should not be too many, otherwise it will affect the melt flow rate and the extrusion rate.

[0047] Referring to Figure 1 , according to the first aspect of the present application, the gap between the inner wall surface of the barrel 100 and the outer end surface of the main screw rib 210 is 0.05mm to 0.5mm, and the inner wall surface of the barrel 100 and the outer end surface of the main screw rib 210 have a certain spacing, which can ensure the passage of the melt while preventing the phenomenon of the inner wall surface of the barrel 100 and the outer end surface of the main screw rib 210 being closed due to thermal expansion and contraction.

[0048] Referring to Figure 2 , according to the first aspect of the present application, the height of the first secondary screw rib 220 and the second secondary screw rib 230 is 0.5 to 0.99 times the height of the main screw rib 210, which facilitates the flow of the melt during the melting process.

[0049] Referring to Figure 1 , according to the first aspect of the present application, the outer wall of the barrel 100 is provided with an exhaust hole 110, which can exhaust the gas in the barrel 100 and prevent the gas pressure in the barrel 100 from being too high to affect the extrusion.​

[0050] According to the second aspect of the present application, the extrusion device comprises the extrusion device according to the first aspect of the present application.

[0051] According to the second aspect of the present application, the first sub-screw groove 221 and the first collecting groove 222 on the screw 200 of the extrusion device are combined into a first melt pool, and the second sub-screw groove 231 and the second collecting groove 232 are combined into a second melt pool. The double-melt-pool structure is beneficial to rapid melting of the material. Since the first sub-screw rib 220 at the first collecting groove 222 is provided with a plurality of first notches 223, and the second sub-screw rib 230 of the second collecting groove 232 is provided with a plurality of second notches 233, the first collecting groove 222 and the second collecting groove 232 are semi-open. At this time, the flowability of the melt relative to the solid bed residue enhances the transverse circulation perpendicular to the first collecting groove 222 and the second collecting groove 232. While accelerating the flow of the melt, the unmelted solid bed residue can quickly enter the first collecting groove 222 and the second collecting groove 232. The unmelted solid bed residue can be quickly melted by the continuous extrusion of the first sub-screw rib 220 and the second sub-screw rib 230, and then pass through the mixing baffle 240 of the metering zone, so as to realize smooth melting and mixing extrusion of the screw 200 at high speed.

[0052] The above embodiments of the present application are described in detail in combination with the drawings. The above embodiments are only used to illustrate the technical solutions of the present application, and are not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the purpose of the present application.

Claims

1. An extrusion device comprising a barrel and a screw provided in the barrel, characterized in that, the screw is provided with a conveying section, a melting section and a metering section; a main flight spirally extends along an outer peripheral wall of the screw and spans the conveying section, the melting section and the metering section; a first sub-flight is provided on the outer wall of the screw and extends from the conveying section to the melting section, the first sub-flight is connected with the main flight to form a first sub-flight groove and a first collection groove in communication with each other, at the first collection groove, the first sub-flight is provided with a plurality of first notches at intervals; a second sub-flight is provided on the outer wall of the screw and extends from the conveying section to the melting section, the second sub-flight is connected with the main flight to form a second sub-flight groove and a second collection groove in communication with each other, at the second collection groove, the second sub-flight is provided with a plurality of second notches at intervals; a plurality of mixing baffles are provided on the outer wall of the screw and located in the metering section; a plurality of primary material collection baffles are provided at intervals in the melting section of the screw, the primary material collection baffles are provided at the first notches and the second notches; the cross section of the primary material collection baffles is wedge-shaped; a plurality of secondary material collection baffles are provided at intervals in the metering section of the screw, the secondary material collection baffles are located at the side edges of the mixing baffles.

2. The extrusion device of claim 1, wherein, The angle between the primary material collection baffles and the axis of the screw decreases in the direction from the conveying section to the metering section.

3. The extrusion device of claim 2, wherein, The angle between the secondary material collection baffles and the axis of the screw is greater than the angle between the primary material collection baffles and the axis of the screw in the direction from the conveying section to the metering section.

4. The extrusion device of claim 1, wherein, The gap between the inner wall of the barrel and the outer end surface of the main flight is 0.05mm to 0.5mm.

5. The extrusion device of claim 1, wherein, The height of the first sub-flight and the second sub-flight is 0.5 to 0.99 times the height of the main flight.

6. The extrusion device of claim 1, wherein, The outer wall of the barrel is provided with exhaust holes.

7. An extrusion apparatus characterized by, An extrusion device comprising any one of claims 1 to 6.

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