Intermittent extrusion systems and extrusion equipment

Abstract

The present invention discloses an intermittent extrusion system and extrusion equipment, wherein the intermittent extrusion system includes a barrel and an extrusion unit, the extrusion unit includes a first screw and a second screw, the first screw and the second screw are both installed in the barrel, the first screw and the second screw are both able to rotate in the barrel, the spiral ridges of the first screw are able to mesh with the spiral grooves of the second screw, and the number of thread heads of the first screw and the second screw is set to be several; wherein the first screw rotates at a constant speed, the second screw rotates intermittently, and the rotation directions of the first screw and the second screw are opposite, and the first screw and the second screw can be meshed at all times during the rotation process, and have good self-cleaning properties. As the second screw rotates, stops, and rotates periodically, the material is continuously stretched, sheared, divided, and replaced, which strengthens the homogenization process of the material, helps to improve the melting efficiency and strengthen the mixing performance of the material, and improves the processing quality of the material.

Description

Technical Field

[0001] The present invention relates to the technical field of twin-screw extrusion, in particular to an intermittent extrusion system and an extrusion system. Background Art

[0002] The traditional extrusion process mainly uses twin-screws to drive the material continuously. The existing twin-screw structure is symmetrical on the left and right, which makes the left and right force fields symmetrical. The material lacks interaction between the front and rear screw grooves, resulting in limited spatial process experience during the flow process, limiting the mixing performance of the material and affecting the processing quality of the material. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the present invention provides an intermittent extrusion system that can improve the distribution, dispersion and mixing effect of materials and enhance the mixing characteristics of materials.

[0004] The present invention also provides an extrusion device having the intermittent extrusion system.

[0005] According to a first aspect of an embodiment of the present invention, an intermittent extrusion system is provided, comprising a barrel and an extrusion unit, the extrusion unit comprising a first screw and a second screw, the first screw and the second screw being both mounted in the barrel, the first screw and the second screw being both capable of rotating in the barrel, the spiral ridges of the first screw being capable of engaging with the spiral grooves of the second screw, the number of thread heads of the first screw and the second screw being both set to a number; wherein the first screw rotates at a constant speed, the second screw rotates intermittently, and the first screw and the second screw rotate in opposite directions.

[0006] The intermittent extrusion system of the embodiment of the present invention has at least the following beneficial effects: the first screw and the second screw are both installed in the barrel, the first screw and the second screw are both able to rotate in the barrel, the first screw and the second screw are meshed, and the number of thread heads of the first screw and the second screw is set to a number, and the first screw is driven to rotate at a uniform speed so that the spiral ridges of the first screw are meshed with the spiral grooves of the second screw, or the spiral ridges of the first screw are separated from the spiral grooves of the second screw, thereby enabling the second screw to move intermittently. The material is compressed and squeezed into the screw groove of the second screw through the spiral ridges of the first screw, so that the material is continuously divided and replaced. In the next cycle, the spiral ridges of the first screw scrape the material out of the screw groove of the second screw, so that the first and second screws maintain good self-cleaning properties, and can continuously stretch, shear, split and replace the material, thereby accelerating the plasticization of the material and strengthening the mixing of the material. The material can move from the screw groove of the second screw to the spiral ridges of the first screw and stand still, so that the material is stretched and the oriented polymer chain is restored. The movement process is stretched in different directions again. The continuous stretching and recovery strengthens the homogenization process of the material and improves the processing quality of the material.

[0007] According to some embodiments of the present invention, the inner diameters of the first screw and the second screw are both d, the outer diameters of the first screw and the second screw are both D, the center distance between the first screw and the second screw is C=(D+d) / 2, the number of thread starts of the first screw is set to n, and the number of thread starts of the second screw is set to m, satisfying: n≤3, m≤5;

[0008] The end face curve of the first screw includes an arc segment N1N2, a curve segment N2N3, an arc segment N3N4 and a curve segment N4N5. The end face curve of the second screw includes an arc segment M1M2, a curve segment M2M3, an arc segment M3M4 and a curve segment M4M5. The curve segments N2N3, N3N4 and N4N5 correspond to the curve segments M2M3, M3M4 and M4M5 in a one-to-one manner.

[0009] Establish a plane rectangular coordinate system xoy, where the center of the end face of the first screw is O1, the center of the end face of the second screw is O2, the coordinates of the center of the end face of the first screw O1 are (a, b), the coordinates of the center of the end face of the second screw O2 are (0, 0), the angle between the line connecting the point on the end face curve of the first screw and the center O1 and O1O2 is θ1, and the angle between the line connecting the point on the end face curve of the second screw and the center O2 and O1O2 is θ2;

[0010] The equation of the arc segment N1N2 is:

[0011] Among them, θ1∈(-π / 2m, 2π / n-3π / 2m];

[0012] The equation of the curve segment N2N3 is:

[0013] where θ1∈(π / 2m-arccos(C / D),π / 2m];

[0014] The equation of the arc segment N3N4 is:

[0015] Among them, θ1∈(-π / 2m+(2m-1)π / m,π / 2m+(2m-1)π / m];

[0016] The equation of the curve segment N4N5 is:

[0017] where θ1∈(3π / 2m,3π / 2m+arccos(C / D)];

[0018] The equation of the arc segment M1M2 is:

[0019] Among them, θ2∈(-π / 2m,π / 2m];

[0020] The equation of the curve segment M2M3 is:

[0021] where θ2∈(π / 2m-arccos(C / D),π / 2m];

[0022] The equations of the arc segments M3M4 are:

[0023] Among them, θ2∈(-π / 2m+(2m-1)π / m,π / 2m+(2m-1)π / m];

[0024] The equation of the curve segment M4M5 is:

[0025] Where θ2∈(3π / 2m,3π / 2m+arccos(C / D)].

[0026] According to some embodiments of the present invention, the first screw and the second screw are both staggered, and the stagger angle of the first screw is The staggered angle of the second screw is The first screw and the second screw are staggered in opposite directions, satisfying:

[0027] According to some embodiments of the present invention, after the end face curve of the first screw is formed, the end face of the first screw rotates clockwise around the center O1 by π-π / n-π / m to obtain the initial position of the first screw;

[0028] After the end face curve of the second screw is formed, the end face of the second screw rotates counterclockwise by π / m around the center O2 to obtain the initial position of the second screw;

[0029] The rotational angular velocity of the first screw is ω, and the motion state of the second screw is:

[0030] When the spiral flight of the first screw contacts the spiral flight of the second screw for the first time:

[0031] Stationary time: t1∈(0,t 1max ];

[0032] Exercise time:

[0033] Static time: t3∈(t 2max , t 2max +(2π / n-2π / m) / ω];

[0034] When the first screw's spiral contacts the second screw's spiral for the second time and thereafter, the following cycle is followed:

[0035] Movement time: t4∈(t 3max , t 3max +T / m];

[0036] Static time: t5∈(t 4max , t 4max +2π / n-2π / m];

[0037] Among them, t 1max =(π / n-π / m) / ω,t Qmax =t Q-1 The right boundary of the value range.

[0038] According to some embodiments of the present invention, along the length direction of the barrel, the shapes of the spiral flutes of the first screw and the spiral flutes of the second screw are both set to be wavy.

[0039] According to a second aspect of the embodiments of the present invention, there is provided an extrusion device comprising the intermittent extrusion system of the embodiment of the first aspect of the present invention.

[0040] The extrusion equipment of the embodiment of the present invention has at least the following beneficial effects: by providing the intermittent extrusion system of the embodiment of the first aspect of the present invention, an asymmetric effect can be introduced, and both the left and right screw grooves and the front and rear screw grooves can be asymmetric. By the material undergoing periodic changes of movement, stillness, and movement during the conveying process, the material can achieve a continuous cycle of stretching, shearing, recovery, and stretching and shearing again. At the same time, the left and right screw grooves and the front and rear screw grooves are mutually intersected, increasing the interface area of ​​the multiphase system and the possibility of uniform distribution, thereby improving the material distribution, dispersion and mixing effect.

[0041] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0043] Figure 1 is a schematic diagram of an intermittent extrusion system according to an embodiment of the first aspect of the present invention;

[0044] Figure 2 1 is a schematic diagram of a first extrusion unit of an intermittent extrusion system according to an embodiment of the first aspect of the present invention;

[0045] Figure 3 Schematic diagram of an extrusion unit with m=5 and n=1 in a batch extrusion system according to the first embodiment of the present invention;

[0046] Figure 4 Schematic diagram of an extrusion unit with m=4 and n=1 in a batch extrusion system according to the first embodiment of the present invention;

[0047] Figure 5 2 is a schematic diagram of a second extrusion unit of an intermittent extrusion system according to an embodiment of the first aspect of the present invention;

[0048] Figure 6 1 is a schematic end view of a second extrusion unit of an intermittent extrusion system according to an embodiment of the first aspect of the present invention;

[0049] Figure 7 2 is a first operational schematic diagram of an extrusion unit of an intermittent extrusion system according to an embodiment of the first aspect of the present invention;

[0050] Figure 8 2 is a second operational schematic diagram of the extrusion unit of the intermittent extrusion system according to the first embodiment of the present invention;

[0051] Figure 93 is a third operating schematic diagram of the extrusion unit of the intermittent extrusion system according to the first embodiment of the present invention;

[0052] Figure 10 2 is a schematic diagram of a third extrusion unit of the intermittent extrusion system according to the first embodiment of the present invention;

[0053] Figure 11 1 is a schematic end view of the third extrusion unit of the intermittent extrusion system according to the first embodiment of the present invention;

[0054] Figure 12 It is a schematic diagram of the extrusion equipment of the second embodiment of the present invention.

[0055] Description of reference numerals:

[0056] Barrel 100, feed port 110, heating mechanism 120;

[0057] Extrusion unit 200, first screw 210, second screw 220;

[0058] A first motor 311 , a first reducer 312 , a second motor 321 , and a second reducer 322 . DETAILED DESCRIPTION

[0059] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0060] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0061] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0062] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0063] It is understandable that, referring to Figures 1 to 3 The intermittent extrusion system of the first embodiment of the present invention includes a barrel 100 and an extrusion unit 200. The extrusion unit 200 includes a first screw 210 and a second screw 220. The first screw 210 and the second screw 220 are both installed in the barrel 100. The first screw 210 and the second screw 220 can both rotate in the barrel 100. The spiral ridges of the first screw 210 can engage with the spiral grooves of the second screw 220. The number of thread heads of the first screw 210 and the second screw 220 is set to several; wherein the first screw 210 rotates at a uniform speed, the second screw 220 rotates intermittently, and the rotation directions of the first screw 210 and the second screw 220 are opposite.

[0064] The first screw 210 and the second screw 220 are both installed in the barrel 100. The first screw 210 and the second screw 220 are both able to rotate in the barrel 100. The first screw 210 and the second screw 220 are meshed. By setting the number of thread heads of the first screw 210 and the second screw 220 to be several, the first screw 210 is driven to rotate at a uniform speed so that the screw ridges of the first screw 210 are meshed with the screw grooves of the second screw 220, or the screw ridges of the first screw 210 are separated from the screw grooves of the second screw 220, so that the second screw 220 can be intermittently moved. The material is compressed and squeezed into the screw groove of the second screw 220 through the spiral ridges of the first screw 210, so that the material is continuously divided and replaced. In the next cycle, the spiral ridges of the first screw 210 scrape the material out of the screw groove of the second screw 220, introducing an asymmetric effect from the screw space structure. The left and right spiral grooves and the front and rear spiral grooves can all be asymmetric. The material undergoes a periodic change pattern of movement, stillness, and movement during the conveying process, so that the material is continuously stretched, sheared, divided and replaced, thereby accelerating the plasticization of the material and strengthening the mixing of the material. The material can move from the screw groove of the second screw 220 to the spiral ridges of the first screw 210 and stand still, so that the material is stretched to form an oriented polymer chain recovery, and then the movement process is stretched in different directions. The continuous stretching and recovery strengthen the homogenization process of the material and improve the processing quality of the material.

[0065] Among them, the first screw 210 rotates at a constant speed and the second screw 220 rotates intermittently, so that the material can move between the first screw 210 and the second screw 220, so that the material is continuously stretched, restored, sheared, etc., thereby enhancing the homogenization and plasticization of the material.

[0066] It should be noted that, referring to Figure 2 and Figure 12 The first screw 210 is driven by a first driving mechanism, and the second screw 220 is driven by a second driving mechanism. The first driving mechanism includes a first motor 311 and a first reducer 312. The first motor 311 is connected to the input end of the first reducer 312, and the output end of the first reducer 312 is connected to the first screw 210; the second driving mechanism includes a second motor 321 and a second reducer 322. The second motor 321 is connected to the input end of the second reducer 322, and the output end of the second reducer 322 is connected to the second screw 220 is connected; the first motor 311 drives the first screw 210 to rotate at a constant speed so that the screw ridges of the first screw 210 can be stuck in the screw grooves of the second screw 220, and then the second motor 321 drives the second screw 220 to rotate so that the first screw 210 and the second screw 220 can be engaged, and the second motor 321 drives the second screw 220 to rotate intermittently, and the screw ridges of the first screw 210 are engaged with the screw grooves of the second screw 220, thereby improving the distribution, dispersion and mixing ability of the materials and enhancing the mixing characteristics.

[0067] Specifically, refer to Figure 2 and Figure 3 The inner diameters of the first screw 210 and the second screw 220 are both d, the outer diameters of the first screw 210 and the second screw 220 are both D, the center distance between the first screw 210 and the second screw 220 is C=(D+d) / 2, the number of thread starts of the first screw 210 is set to n, and the number of thread starts of the second screw 220 is set to m, satisfying: n≤3, m≤5; the end face curve of the first screw 210 includes an arc segment N1N2, a curve segment N2N3, an arc segment N3N4 and a curve segment N4N5, and the end face curve of the second screw 220 includes an arc segment M1M2, a curve segment M2M3, an arc segment M3M4 and a curve segment M4M5, wherein In the figure, the curve segment N2N3, the arc segment N3N4, and the curve segment N4N5 correspond to the curve segment M2M3, the arc segment M3M4, and the curve segment M4M5 in a one-to-one manner; a plane rectangular coordinate system xoy is established, the end face center of the first screw 210 is O1, the end face center of the second screw 220 is O2, the coordinates of the end face center O1 of the first screw 210 are (a, b), and the coordinates of the end face center O2 of the second screw 220 are (0, 0); the angle between the line connecting the point on the end face curve of the first screw 210 and the circle center O1 and O1O2 is θ1, and the angle between the line connecting the point on the end face curve of the second screw 220 and the circle center O2 and O1O2 is θ2;

[0068] The equation of the arc segment N1N2 is:

[0069] Among them, θ1∈(-π / 2m, 2π / n-3π / 2m];

[0070] The equation of the curve segment N2N3 is:

[0071] where θ1∈(π / 2m-arccos(C / D),π / 2m];

[0072] The equation of the arc segment N3N4 is:

[0073] Among them, θ1∈(-π / 2m+(2m-1)π / m,π / 2m+(2m-1)π / m];

[0074] The equation of the curve segment N4N5 is:

[0075] where θ1∈(3π / 2m,3π / 2m+arccos(C / D)];

[0076] The equation of the arc segment M1M2 is:

[0077] Among them, θ2∈(-π / 2m,π / 2m];

[0078] The equation of the curve segment M2M3 is:

[0079] where θ2∈(π / 2m-arccos(C / D),π / 2m];

[0080] The equation of the arc segment M3M4 is:

[0081] Among them, θ2∈(-π / 2m+(2m-1)π / m,π / 2m+(2m-1)π / m];

[0082] The equation of the curve segment M4M5 is:

[0083] Where θ2∈(3π / 2m,3π / 2m+arccos(C / D)].

[0084] The end face curve of the first screw 210 is composed of a plurality of arc segments N1N2, curve segments N2N3, arc segments N3N4 and curve segments N4N5 connected in sequence, and the end face curve of the second screw 220 is composed of a plurality of arc segments M1M2, curve segments M2M3, arc segments M3M4 and curve segments M4M5 connected in sequence, so that the end face curve of the first screw 210 is composed of several identical parts arranged in a surrounding manner, and the end face curve of the second screw 220 is composed of multiple identical parts arranged in a surrounding manner.

[0085] After the end face curve of the first screw 210 and the end face curve of the second screw 220 are formed, point N1 coincides with point N5 , and point M1 coincides with point M5 .

[0086] Establish a rectangular coordinate system xoy. For the first screw 210, the arc segment N1N2, curved segment N2N3, arc segment N3N4, and curved segment N4N5 are sequentially connected and arranged into n portions along the circumference of the first screw 210 to obtain the end face curve of the first screw 210. For the second screw 220, the arc segment M1M2, curved segment M2M3, arc segment M3M4, and curved segment M4M5 are sequentially connected and arranged into m portions along the circumference of the second screw 220 to obtain the end face curve of the second screw 220.

[0087] It should be noted that the curve segment N2N3, arc segment N3N4, curve segment N4N5 correspond one-to-one to the curve segment M2M3, arc segment M3M4, curve segment M4M5, and the equations of the corresponding end face curves of the first screw 210 and the second screw 220 are the same, which will not be repeated here.

[0088] By defining the end face curves of the first screw 210 and the second screw 220, the first screw 210 can mesh smoothly with the second screw 220, and the first screw 210 and the second screw 220 can maintain good self-cleaning properties, thereby reducing material adhesion, avoiding the reduction in product quality caused by material residue during processing, and improving the processing quality of the material.

[0089] Specifically, refer to Figure 5 and Figure 6 The first screw 210 and the second screw 220 are both staggered, and the stagger angle of the first screw 210 is The staggered angle of the second screw 220 is The first screw 210 and the second screw 220 are staggered in opposite directions, satisfying: The first screw 210 and the second screw 220 are both staggered, and the stagger angle of the first screw 210 is set to The staggered angle of the second screw 220 is satisfy The first screw 210 and the second screw 220 can be smoothly engaged, and the contact time of the first screw 210 and the second screw 220 can be extended, thereby strengthening the stretching, shearing, segmentation and replacement of the material, realizing the mutual intersection of the left and right screw grooves and the front and rear screw grooves, increasing the interface area of ​​the multiphase system and the possibility of uniform distribution, thereby improving the material distribution, dispersion and mixing ability, accelerating the plasticization of the material, strengthening the mixing of the material, and enhancing the homogenization process of the material.

[0090] It should be noted that the spiral ridges of the first screw 210 may extend counterclockwise along the circumferential direction, and the spiral ridges of the second screw 220 may extend clockwise along the circumferential direction, so that the first screw 210 can mesh smoothly with the second screw 220 .

[0091] Specifically, refer to Figures 7 to 9 After the end surface curve of the first screw 210 is formed, the end surface of the first screw 210 rotates clockwise around the center O1 by π-π / n-π / m to obtain the initial position of the first screw 210;

[0092] After the end face curve of the second screw 220 is formed, the end face of the second screw 220 rotates counterclockwise around the center O2 by π / m to obtain the initial position of the second screw 220; the rotational angular velocity of the first screw 210 is ω, and the motion state of the second screw 220 is:

[0093] When the screw ridges of the first screw 210 and the screw ridges of the second screw 220 first come into contact:

[0094] Stationary time: t1∈(0,t 1max ];

[0095] Exercise time:

[0096] Static time: t3∈(t 2max , t 2max +(2π / n-2π / m) / ω];

[0097] When the spiral of the first screw 210 contacts the spiral of the second screw 220 for the second time and thereafter, the following cycle is followed:

[0098] Movement time: t4∈(t 3max , t 3max +T / m];

[0099] Static time: t5∈(t 4max , t 4max +2π / n-2π / m];

[0100] Among them, t 1max =(π / n-π / m) / ω,t Qmax =t Q-1 The right boundary of the value range.

[0101] Reference Figure 7 , set the initial positions of the first screw 210 and the second screw 220 as Figure 7 As shown, the first screw 210 rotates clockwise from the initial position, and the second screw 220 remains stationary during this process. Since the first screw 210 and the second screw 220 are arranged in a staggered manner, when the screw ridges of the first screw 210 and the screw ridges of the second screw 220 first contact each other, the contact time and the rotation angle are extended.

[0102] The first screw 210 rotates clockwise over time, and the rotational angular velocity of the first screw 210 is ω. When time t∈(0,u1], the rotation angle of the first screw 210 is π / n-π / m, and the second screw 220 is stationary at this time with an interval u1=(π / n-π / m) / ω.

[0103] Reference Figure 8 At time t∈(u1, u2], the first screw 210 rotates clockwise with time, and the second screw 220 starts to actively and synchronously move counterclockwise at a speed ω, and the movement angle is Exercise time is

[0104] Reference Figure 9 At time t∈(u2, u3], the second screw 220 just rotates through the angle of one screw flute plus The first screw 210 rotates clockwise over time, and the first screw 210 continues to rotate at an angle of 2π / n-2π / m; for the second screw 220, it then begins to intermittently (2π / n-2π / m) / ω, u3=u2+(2π / n-2π / m) / ω.

[0105] When the screw ridges of the first screw 210 and the screw ridges of the second screw 220 come into contact for the second time:

[0106] At time t∈(u3, u4], the first screw 210 rotates clockwise over time, and the second screw 220 starts to actively and synchronously move counterclockwise at a speed ω, and the movement time is T / m, u4=u3+T / m.

[0107] At time t∈(u4, u5], the first screw 210 keeps rotating with time, and the second screw 220 is intermittent at this time (2π / n-2π / m) / ω, u5=u4+2π / n-2π / m.

[0108] Subsequent time t∈(u5,u6]……(u n-1 ,u n ]hour:

[0109] The two processes t∈(u3, u4] and t∈(u4, u5] are repeated until the first screw 210 rotates m / n circles clockwise and the second screw 220 rotates one circle counterclockwise, completing one cycle of motion.

[0110] The material is repeatedly compressed and squeezed from the screw groove of the first screw 210 into the second screw 220. In the next cycle, the m portions of material in the second screw 220's groove are transferred to the n grooves of the first screw 210. The material is continuously stretched, sheared, divided, and displaced, accelerating its plasticization and enhancing its mixing. Simultaneously, the viscoelastic polymer material moves from the first screw 210's groove to the second screw 220's groove where it rests, stretching the material and allowing the oriented polymer chains to recover. Upon further movement, the material is stretched in different directions. This continuous stretching and recovery process enhances the homogenization of the material.

[0111] It is understandable that, referring to Figure 3 , define the number of thread heads of the first screw 210 as n=1, the number of thread heads of the second screw 220 as m=5, the end face curve of the first screw 210 is composed of arc segment N1N2, curve segment N2N3, arc segment N3N4 and curve segment N4N5 connected in sequence, the end face curve of the second screw 220 is composed of 5 parts connected in sequence along the circumferential direction, each part is composed of arc segment M1M2, curve segment M2M3, arc segment M3M4 and curve segment M4M5 connected in sequence, the coordinates of the end face center O1 of the first screw 210 are (a, b), the coordinates of the end face center O2 of the second screw 220 are (0, 0), the angle between the line connecting the point on the end face curve of the first screw 210 and the circle center O1 and O1O2 is θ1, and the angle between the line connecting the point on the end face curve of the second screw 220 and O1O2 is θ2;

[0112] The equations of the curves of each segment of the first screw 210 are as follows:

[0113] The equation of the arc segment N1N2 is:

[0114] Among them, θ1∈(-π / 10, 17π / 10];

[0115] The equation of the curve segment N2N3 is:

[0116] where θ1∈(π / 10-arccos(C / D),π / 10];

[0117] The equation of the arc segment N3N4 is:

[0118] Among them, θ1∈(17π / 10,19π / 10];

[0119] The equation of the curve segment N4N5 is:

[0120] where θ1∈(3π / 10,3π / 10+arccos(C / D)];

[0121] The equations of the curves of each section of the second screw 220 are as follows:

[0122] The equation of the arc segment M1M2 is:

[0123] Among them, θ2∈(-π / 10,π / 10];

[0124] The equation of the curve segment M2M3 is:

[0125] where θ2∈(π / 10-arccos(C / D),π / 10];

[0126] The equation of the arc segment M3M4 is:

[0127] Among them, θ2∈(17π / 10,19π / 10];

[0128] The equation of the curve segment M4M5 is:

[0129] where θ2∈(3π / 10,3π / 10+arccos(C / D)].

[0130] The rotation period of the first screw 210 is set to T. At this time, the first screw 210 is a single-start thread, and the second screw 220 is a five-start thread. When the first screw 210 moves clockwise from the initial position and starts to rotate, the second screw 220 is stationary during the process.

[0131] When the first screw 210 rotates clockwise by 4π / 5, the first screw 210 and the second screw 220 make contact for the first time, and the second screw 220 starts to move synchronously counterclockwise with the first screw 210 at the same speed, and starts to rotate by an angle Time When the staggered angle between the first screw 210 and the second screw 220 is 0,

[0132] As the first screw 210 rotates clockwise again, the second screw 220 remains stationary until the first screw 210 continues to rotate clockwise by 8π / 5, which takes 4T / 5. The first screw 210 and the second screw 220 then make contact for the second time. The second screw 220 then begins to move counterclockwise synchronously with the first screw 210 at the same speed of T / 5, rotating through an angle of 2π / 5.

[0133] The first screw 210 and the second screw 220 start to make contact for the second time, and the first screw 210 rotates five times clockwise and the second screw 220 rotates one time counterclockwise, completing one cycle of movement.

[0134] It is understandable that, referring to Figure 4, define the number of thread heads of the first screw 210 as n=1, the number of thread heads of the second screw 220 as m=4, the end face curve of the first screw 210 is composed of arc segment N1N2, curve segment N2N3, arc segment N3N4 and curve segment N4N5 connected in sequence, the end face curve of the second screw 220 is composed of 4 parts connected in sequence along the circumferential direction, each part is composed of arc segment M1M2, curve segment M2M3, arc segment M3M4 and curve segment M4M5 connected in sequence, the coordinates of the end face center O1 of the first screw 210 are (a, b), the coordinates of the end face center O2 of the second screw 220 are (0, 0), the angle between the line connecting the point on the end face curve of the first screw 210 and the circle center O1 and O1O2 is θ1, and the angle between the line connecting the point on the end face curve of the second screw 220 and O1O2 is θ2;

[0135] The equations of the curves of each segment of the first screw 210 are as follows:

[0136] The equation of the arc segment N1N2 is:

[0137] Among them, θ1∈(-π / 8, 13π / 8];

[0138] The equation of the curve segment N2N3 is:

[0139] where θ1∈(π / 8-arccos(C / D),π / 8];

[0140] The equation of the arc segment N3N4 is:

[0141] Among them, θ1∈(13π / 8,15π / 8];

[0142] The equation of the curve segment N4N5 is:

[0143] where θ1∈(3π / 8,3π / 8+arccos(C / D)];

[0144] The equations of the curves of each section of the second screw 220 are as follows:

[0145] The equation of the arc segment M1M2 is:

[0146] Among them, θ2∈(-π / 8,π / 8];

[0147] The equation of the curve segment M2M3 is:

[0148] where θ2∈(π / 8-arccos(C / D),π / 8];

[0149] The equation of the arc segment M3M4 is:

[0150] Among them, θ2∈(13π / 8,15π / 8];

[0151] The equation of the curve segment M4M5 is:

[0152] Where θ2∈(3π / 8,3π / 8+arccos(C / D)].

[0153] The number of thread starts of the first screw rod 210 is defined as n=1, and the end face curve of the first screw rod 210 is composed of an arc segment N1N2, a curve segment N2N3, an arc segment N3N4 and a curve segment N4N5 connected in sequence.

[0154] The rotation period of the first screw 210 is set to T. At this time, the first screw 210 is a single-start thread, and the second screw 220 is a four-start thread. When the first screw 210 moves clockwise from the starting position and starts to rotate, the second screw 220 is stationary during the process.

[0155] When the first screw 210 rotates 7π / 8, the first screw 210 and the second screw 220 come into contact for the first time, and the second screw 220 starts to move synchronously counterclockwise with the first screw 210 at the same speed. Time When the staggered angle between the first screw 210 and the second screw 220 is 0,

[0156] When the first screw 210 rotates clockwise again, the second screw 220 remains stationary again until the first screw 210 rotates clockwise again through an angle of 3π / 2. The first screw 210 and the second screw 220 then come into contact for the second time. The second screw 220 then starts to move counterclockwise synchronously with the first screw 210 at the same speed of T / 4, rotating through an angle of π / 2.

[0157] The first screw 210 and the second screw 220 start to make contact for the second time, and the first screw 210 rotates four times clockwise and the second screw 220 rotates one time counterclockwise, completing one cycle of movement.

[0158] Specifically, refer to Figure 10 and Figure 11Along the length of the barrel 100, the corrugations of the first screw 210 and the second screw 220 are both wavy in shape. By arranging the corrugations of the first screw 210 and the second screw 220 to be wavy, the material flow path is altered when the first screw 210 and the second screw 220 engage, causing a change in the orientation of the dispersed phase. This also increases the material residence time, promotes material melting and mixing, and enhances the material mixing characteristics.

[0159] It is understandable that, referring to Figure 12 The extrusion equipment of the second embodiment of the present invention includes the intermittent extrusion system of the first embodiment of the present invention. Since it has all the technical features of the intermittent extrusion system of this embodiment, it also has the beneficial effects of all the above embodiments, which will not be repeated here.

[0160] It should be noted that the barrel 100 is provided with a feed port 110, and the material is fed into the feed port 110 so that the material can enter the interior of the barrel 100. The first motor 311, the first reducer 312 and the second motor 321, the second reducer 322 cooperate to respectively drive the first screw 210 and the second screw 220 to rotate. The outer wall of the barrel 100 is provided with a heating mechanism 120. Through the action of the heating mechanism 120 and the viscous dissipation heat, the material can be melted, and the material can be transformed from a glassy state to a highly elastic state and then to a viscous flow state, so that the material can be easily plasticized and homogenized.

[0161] Along the conveying direction of the material, the extrusion unit 200 can be sequentially arranged as a partially meshing or non-meshing counter-rotating twin screw or a large-lead intermittent meshing mixing element, an intermittent meshing mixing element, and a wavy asymmetric mixing element. The material is conveyed by the partially meshing counter-rotating twin screw or the non-meshing counter-rotating twin screw or the large-lead intermittent meshing element; the intermittent meshing mixing element includes a first screw 210 and a second screw 220. The first screw 210 continuously moves so that the screw groove of the first screw 210 is The material close to the inner wall of the barrel 100 is melted into a fluid, forming a molten pool during the movement, and is transported to a screw groove of the second screw 220 during the rotation. At the same time, the unmelted glassy material in a screw groove of the second screw 220 is transported to the screw groove of the first screw 210, completing the melting process again; then the wavy asymmetric mixing element changes the material movement trajectory and direction in the late stage of material melting and homogenization, increases the material residence time, promotes the melting and mixing of the material in this section, and improves the processing quality of the material.

[0162] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the scope of the present invention.

Claims

1. Intermittent extrusion system, characterized in that, include: barrel; An extrusion unit includes a first screw and a second screw, wherein the first screw and the second screw are both installed in the barrel, the first screw and the second screw are both rotatable in the barrel, the screw ridges of the first screw are engageable with the screw grooves of the second screw, and the number of thread starts of the first screw and the second screw are both set to a plurality; The first screw rotates at a constant speed, the second screw rotates intermittently, and the rotation directions of the first screw and the second screw are opposite; The inner diameters of the first screw and the second screw are both The outer diameters of the first screw and the second screw are , the center distance between the first screw and the second screw , the number of thread heads of the first screw is set to The number of thread heads of the second screw is set to , satisfying: , ; The first screw and the second screw are both staggered, and the stagger angle of the first screw is , the staggered angle of the second screw is , the first screw and the second screw are staggered in opposite directions, satisfying: ; or along the length direction of the barrel, the shapes of the spiral ridges of the first screw and the spiral ridges of the second screw are both set to be wavy.

2. The intermittent extrusion system according to claim 1, characterized in that: The end curve of the first screw includes an arc segment , curve segment , arc segment and curve segments The end curve of the second screw includes an arc segment , curve segment , arc segment and curve segments , where the curve segment , arc segment , curve segment With curve segment , arc segment , curve segment One-to-one correspondence; Establish a plane rectangular coordinate system , the end center of the first screw is , the center of the end face of the second screw is , the center of the end face of the first screw The coordinates are , the center of the end face of the second screw The coordinates are , the point on the end curve of the first screw and the center of the circle The connection with The angle is , the point on the end curve of the second screw and the center of the circle The connection with The angle is ; The arc segment The equation is: ; in, ; The curve segment The equation is: ; in, ; The arc segment The equation is: ; in, ; The curve segment The equation is: ; in, ; The arc segment The equation is: ; in, ; The curve segment The equation is: ; in, ; The arc segment The equation is: ; in, ; The curve segment The equation is: ; in, .

3. The intermittent extrusion system according to claim 2, characterized in that: After the end face curve of the first screw is formed, the end face of the first screw revolves around the center of the circle. Clockwise rotation is the initial position of the first screw; After the end face curve of the second screw is formed, the end face of the second screw revolves around the center of the circle Counterclockwise rotation is the initial position of the second screw; The rotational angular velocity of the first screw is , the rotation period of the first screw is , the motion state of the second screw is: When the spiral flight of the first screw contacts the spiral flight of the second screw for the first time: Still time: ]; Exercise time: ; Still time: ; When the first screw's spiral contacts the second screw's spiral for the second time and thereafter, the following cycle is followed: Exercise time: ; Still time: ; in, , = The right boundary of the value range.

4. Extrusion equipment, characterized in that, The invention comprises a batch extrusion system according to any one of claims 1 to 3.

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