阅读说明：本技术 用于石头纸连续密炼造粒机的异向平行双螺杆 (Incongruous parallel double screw for stone paper continuous banburying granulator ) 是由 贾中奇 任哲东 于 2020-05-15 设计创作，主要内容包括：本发明涉及一种用于石头纸连续密炼造粒机的异向平行双螺杆,包括两个间隔平行设置的螺杆一和螺杆二,螺杆一和螺杆二镜像对称在两者之间具有的中心线的两侧形成异向设置；螺杆一包括从左至右依次相邻同轴设置的安装段一、入料段一、第一段右旋密炼转子、右旋缓冲段和第二段右旋密炼转子；螺杆二包括从左至右依次相邻同轴设置的安装段二、入料段二、第一段左旋密炼转子、左旋缓冲段和第二段左旋密炼转子。本发明整体上实现了两次高挤压和低剪切作用,相比传统的平行双螺杆结构,可有效地降低剪切热以及因剪切过热而破坏原料分子链结构。(The invention relates to an incongruous parallel double screw for a stone paper continuous banburying granulator, which comprises a first screw and a second screw which are arranged in parallel at intervals, wherein the first screw and the second screw are arranged in opposite directions at two sides of a central line between the first screw and the second screw in a mirror symmetry manner; the screw rod I comprises a mounting section I, a feeding section I, a first section right-handed mixing rotor, a right-handed buffer section and a second section right-handed mixing rotor which are sequentially adjacent and coaxially arranged from left to right; the screw rod II comprises a mounting section II, a feeding section II, a first left-handed banburying rotor, a left-handed buffering section and a second left-handed banburying rotor which are sequentially adjacent and coaxially arranged from left to right. The invention realizes the functions of twice high extrusion and low shearing integrally, and can effectively reduce shearing heat and damage the molecular chain structure of the raw material due to shearing overheating compared with the traditional parallel double-screw structure.)

1. The incongruous parallel double screws for the stone paper continuous banburying granulator are characterized by comprising a first screw and a second screw which are arranged in parallel at intervals, wherein the first screw and the second screw are arranged in incongruous manner at two sides of a central line between the first screw and the second screw in a mirror symmetry manner;

the screw rod I comprises a mounting section I (1), a feeding section I (3), a first section of right-handed mixing rotor (5), a right-handed buffer section (7) and a second section of right-handed mixing rotor (9) which are sequentially adjacent and coaxially arranged from left to right;

the screw rod II comprises a mounting section II (2), a feeding section II (4), a first left-handed banburying rotor (6), a left-handed buffer section (8) and a second left-handed banburying rotor (10) which are sequentially adjacent and coaxially arranged from left to right.

2. The counter-rotating parallel twin screws for the stone paper continuous internal mixing granulator of claim 1, wherein the feeding section I (3) of the screw I and the feeding section II (4) of the screw II are arranged in counter-rotating mode formed by mirror symmetry about the center lines of the screw I and the screw II, so that forward conveying of stone paper formula raw materials entering through a feeding port of the granulator is realized;

the first section of right-handed internal mixing rotor (5) of the screw I and the first section of left-handed internal mixing rotor (6) of the screw II are arranged in different directions formed by mirror symmetry about the central lines of the screw I and the screw II to form a first high extrusion and low shearing action on the raw materials of the stone paper formula;

the right-handed buffer section (7) of the first screw and the left-handed buffer section (8) of the second screw are arranged in different directions formed by mirror symmetry about the central lines of the first screw and the second screw, so that pressure release of the raw materials of the stone paper formula subjected to the first high extrusion and low shearing action is realized;

and the second section of right-handed banburying rotor (9) of the first screw and the second section of left-handed banburying rotor (10) of the second screw are arranged in a different direction relative to the central lines of the first screw and the second screw, so that the second high extrusion and low shearing effects on the raw materials of the stone paper formula are formed.

3. The incongruous parallel twin-screw for the stone paper continuous internal mixing granulator according to claim 2, characterized in that the helical direction of the screw ridge of the feeding section I (3) of the screw I is the same as that of the right-handed buffer section (7), and the helical direction of the screw ridge of the feeding section II (4) of the screw II is the same as that of the left-handed buffer section (8);

the first section of right-handed mixing rotor (5) of the screw rod I is provided with at least two first ribs protruding outwards along the circumferential direction, and the second section of right-handed mixing rotor (9) is provided with at least two second ribs protruding outwards along the circumferential direction;

the first section of left-handed mixing rotor (6) of the screw rod II is provided with at least two ribs III protruding outwards along the circumferential direction, and the second section of left-handed mixing rotor (10) is provided with at least two ribs IV protruding outwards along the circumferential direction.

4. The counter-rotating parallel twin screws for the stone paper continuous mixing granulator according to claim 3, wherein the starting point and the end point of the first rib of the first right-handed mixing rotor (5) of the first screw are on the central line of the first screw, and the first rib of the first right-handed mixing rotor (5) is bent and deformed from the starting point to the middle part outwards and then bent and deformed from the middle part to the end point inwards to form a side surface with a twisted smooth curved surface;

the starting point and the end point of a second rib of the second section of right-handed mixing rotor (9) are on the central line of the first screw rod, and the first rib of the second section of right-handed mixing rotor (9) is bent and deformed outwards from the starting point to the middle part and then bent and deformed inwards from the middle part to the end point to form a side surface with a twisted smooth curved surface;

the starting point and the end point of the first section of left-handed mixing rotor (6) of the second screw are on the central line of the second screw, and the third convex edge of the first section of left-handed mixing rotor (6) bends outwards from the starting point to the middle part and then bends inwards from the middle part to the end point to form a side surface with a twisted smooth curved surface;

the starting point and the end point of the second left-handed mixing rotor (10) are on the central line of the second screw, and the bead IV of the second left-handed mixing rotor (10) is bent outwards from the starting point to the middle part and then is bent inwards from the middle part to the end point to form a side surface with a twisted smooth curved surface.

5. The counter-rotating parallel twin screws for the stone paper continuous mixing granulator according to claim 4, wherein the bending deformation from the starting point to the middle part of the first rib of the first section of the right-handed mixing rotor (5) and the second rib of the second section of the right-handed mixing rotor (9) of the first screw is leftward bent in the extrusion motion direction;

and the bending deformation from the starting point to the middle part of the bead III of the first section of the left-handed mixing rotor (6) and the bead IV of the second section of the left-handed mixing rotor (10) of the screw rod II is rightward bending.

6. The counter-rotating parallel twin screws for the stone paper continuous mixing granulator according to claim 4, characterized in that the lead of the first-stage right-handed mixing rotor (5) of the first screw is equal to the lead of the first-stage left-handed mixing rotor (6) of the second screw, and the lead of the second-stage right-handed mixing rotor (9) of the second screw is equal to the lead of the second-stage left-handed mixing rotor (10) of the second screw;

the lead of the right-handed mixing rotor (5) in the first section is smaller than the lead of the right-handed mixing rotor (9) in the second section.

7. The incongruous parallel twin screw for the stone paper continuous internal mixing granulator of claim 4, wherein the rotation direction of the first screw along its own centerline and the rotation direction of the second screw along its own centerline are both directions in which one rotates inwards relative to the other;

in the process that the first screw and the second screw rotate relatively towards each other, on the same section, when one rib I of the first section of the right-handed banburying rotor (5) of the first screw is a peak, one rib III of the first section of the left-handed banburying rotor (6) of the second screw is a peak; on the same other cross section, when one rib two of the right-handed mixing rotor (9) of the second section of the screw rod I is a peak, one rib four of the left-handed mixing rotor (10) of the second section of the screw rod II is a peak.

8. The counter-rotating parallel twin screws for the stone paper continuous mixing granulator according to claim 4, wherein the distance between the peak of the first rib of the first section of the first right-handed mixing rotor (5) or the peak of the second rib of the second section of the right-handed rotor of the first screw and the inner wall of the mixing chamber of the granulator is not greater than the distance between the peak of the first feeding section (3) or the right-handed buffer section (7) and the inner wall of the mixing chamber of the granulator;

the distance between the crest of the third rib of the first left-handed banburying rotor (6) of the screw rod II or the crest of the fourth rib of the second left-handed banburying rotor (10) of the screw rod II and the inner wall of the granulator is not more than the distance between the crest of the feeding section II (4) or the left-handed buffer section (8) and the inner wall of the banburying chamber of the granulator.

9. The incongruous parallel twin screw for the stone paper continuous internal mixing granulator of claim 1, wherein the bottom diameters of the first mounting section (1) of the first screw and the second mounting section (2) of the second screw are increased in a three-step manner from one end to the other end;

the one end of the mounting section I (1) is the end, extending out of the mixing chamber of the granulator and connected with the outside of the mixing chamber in a speed ratio gear transmission mode, of the mounting section I (1), and the other end of the mounting section I (1) is the end, connected with the feeding section I (3) of the screw rod I, of the mounting section I (1);

and one end of the second mounting section (2) is the end of the second mounting section (2) which extends out of the mixing chamber of the granulator and is in transmission connection with a speed ratio gear outside the mixing chamber, and the other end of the second mounting section (2) is the end of the second mounting section (2) which is connected with the second feeding section (4) of the second screw rod.

10. The incongruous parallel twin screw for the stone paper continuous mixing granulator according to claim 9, further comprising a first connecting section (11) connected with the second right-handed mixing rotor (9) of the first screw and a second connecting section (12) connected with the second left-handed mixing rotor (10) of the second screw, wherein the bottom diameters of the first connecting section (11) of the first screw and the second connecting section (12) of the second screw are reduced in a two-step manner from one end to the other end;

the one end of the first connecting section (11) is the end of the first connecting section (11) connected with the second section of the right-handed internal mixing rotor (9) of the first screw rod, and the other end of the first connecting section (11) is the terminal of the first screw rod; the one end of the second connecting section (12) is the end of the second connecting section (12) connected with the second left-handed banburying rotor (10) of the second screw rod, and the other end of the second connecting section (12) is the terminal of the second screw rod;

a first central cooling water channel (13) extending into the first screw rod is formed in the center of the other end of the first connecting section (11), a second central cooling water channel (14) extending into the second screw rod is formed in the center of the second connecting section (12), and the first central cooling water channel (13) and the second central cooling water channel (14) are stepped holes;

the small-diameter section of the first central cooling water channel (13) extends from the first connecting section (11) of the first screw rod to the other end close to the first mounting section (1), and the small-diameter section of the second central cooling water channel (14) extends from the second connecting section (12) of the second screw rod to the other end close to the second mounting section (2);

the other end face of the connecting section I (11) is provided with at least two first threaded holes (15) along the center ring of the large-diameter section of the central cooling water channel I (13), and the other end face of the connecting section II (12) is provided with at least two second threaded holes (16) along the center ring of the large-diameter section of the central cooling water channel II (14).

Technical Field

The invention relates to the field of stone paper production and manufacturing, in particular to an incongruous parallel double screw for a stone paper continuous banburying granulator.

Background

The environment-friendly stone paper is simply called stone paper, and is a plurality of series of paper products produced by using high-density polyethylene, metallocene polyethylene and the like as base materials, using high-share ground limestone as filling materials, adding part of processing aids, performing extrusion blow molding, performing secondary blow molding, coating and other processes. Unlike conventional plant fiber paper making, some people in the industry believe that the stone paper manufacturing process is closer to plastic manufacturing, and specifically, the stone paper combines the basic properties of the conventional plant fiber paper and the core properties of plastic packaging. Particularly, under the large background of energy conservation and emission reduction and development of low-carbon economy in recent years, along with deepening of an environmental protection concept and breakthrough of a production process of stone paper, the application field of the stone paper is more and more extensive, for example, during two meetings in 2010, meeting notices, daily schedules, notepaper and the like which are received by political committees are low-carbon stone paper which takes calcium carbonate as a main raw material, and in addition, map introduction of Shanghai world exposition in 2010 and world exposition is environment-friendly low-carbon stone paper which is also used, the stone paper is gradually applied to disposable life consumables, cultural paper, packaging decoration paper and special paper.

It is known that the production process of stone paper mainly comprises a calendering method, a casting method and a biaxial tension method, and the production equipment of stone paper is also developing towards automation, high performance and large-scale. The most obvious characteristic of the existing continuous mixing granulator is continuous feeding, the production efficiency of the existing continuous mixing granulator provides feeding speed, constant feeding is guaranteed, the working principle is similar to that of a mixer, namely a pair of rotors are arranged in a closed mixing chamber, the rotors are driven to rotate by a speed ratio gear outside the mixing chamber, but the rotors are continuously fed and discharged like twin screws, in practical application, investigation shows that some rotors in the mixing chamber still adopt a parallel twin screw structure recorded in the patent document of twin screw granulator with the granted publication number of CN2336946Y, namely the traditional parallel twin screw structure, but the mixing time is too long due to too single structure, the problems of high temperature and high shearing strength are caused, the breakage ratio of molecular chains of raw materials is large, and the performance of the produced stone paper is poor.

Disclosure of Invention

The invention provides an incongruous parallel double screw for a stone banburying granulator, which aims to solve the problems of high temperature, high shearing strength and large breaking ratio of molecular chains of raw materials caused by a traditional parallel double screw structure adopted by the existing continuous banburying granulator.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a counter-rotating parallel double screw for a stone paper continuous banburying granulator comprises a first screw and a second screw which are arranged in parallel at intervals, wherein the first screw and the second screw are arranged in counter-rotating mode at two sides of a central line between the first screw and the second screw in mirror symmetry;

the screw rod I comprises a mounting section I, a feeding section I, a first section right-handed mixing rotor, a right-handed buffer section and a second section right-handed mixing rotor which are sequentially adjacent and coaxially arranged from left to right;

the screw rod II comprises an installation section II, a feeding section II, a first left-handed banburying rotor, a left-handed buffer section and a second left-handed banburying rotor which are sequentially adjacent and coaxially arranged from left to right.

Furthermore, the feeding section I of the screw I and the feeding section II of the screw II are arranged in different directions formed by mirror symmetry about the central lines of the screw I and the screw II, so that the effect of forward conveying of the stone paper formula raw material entering through a feeding port of the granulator is realized;

the first section of right-handed internal mixing rotor of the screw I and the first section of left-handed internal mixing rotor of the screw II are arranged in different directions formed by mirror symmetry about the central lines of the screw I and the screw II, so that the first high extrusion and low shearing action on the raw materials of the stone paper formula is formed;

the right-handed buffer section of the screw I and the left-handed buffer section of the screw II are arranged in different directions formed by mirror symmetry about the central lines of the screw I and the screw II, so that pressure release of the raw materials of the stone paper formula subjected to the first high-extrusion and low-shear actions is realized;

the second section of right-handed mixing rotor of the screw I and the second section of left-handed mixing rotor of the screw II are arranged in a different direction relative to the central lines of the screw I and the screw II, so that the second high extrusion and low shearing action on the raw materials of the stone paper formula is formed.

Furthermore, the spiral direction of the spiral edge of the feeding section I of the screw rod I is the same as that of the spiral edge of the right-handed buffer section, and the spiral direction of the spiral edge of the feeding section II of the screw rod II is the same as that of the spiral edge of the left-handed buffer section;

the first section of right-handed mixing rotor of the screw rod I is provided with at least two first ribs protruding outwards along the circumferential direction, and the second section of right-handed mixing rotor is provided with at least two second ribs protruding outwards along the circumferential direction;

the first section of left-handed mixing rotor of the screw rod II is provided with at least two convex ribs III which are outwards convex along the circumferential direction, and the second section of left-handed mixing rotor is provided with at least two convex ribs IV which are outwards convex along the circumferential direction.

Furthermore, the starting point and the end point of the first rib of the first section of the right-handed mixing rotor of the first screw rod are on the central line of the first screw rod, and the first rib of the first section of the right-handed mixing rotor is bent and deformed outwards from the starting point to the middle part and then bent and deformed inwards from the middle part to the end point to form a side surface with a twisted smooth curved surface;

the starting point and the end point of a second rib of the second section of right-handed mixing rotor are on the central line of the first screw rod, and the first rib of the second section of right-handed mixing rotor is bent and deformed outwards from the starting point to the middle part and then bent and deformed inwards from the middle part to the end point to form a side surface with a twisted smooth curved surface;

the starting point and the end point of the first section of the left-handed mixing rotor of the screw rod II are on the central line of the screw rod II, and the bead III of the first section of the left-handed mixing rotor is bent outwards from the starting point to the middle part and then is bent inwards from the middle part to the end point to form a side surface with a twisted smooth curved surface;

the starting point and the end point of the second left-handed mixing rotor section are on the central line of the second screw rod, and the bead IV of the second left-handed mixing rotor section is bent outwards from the starting point to the middle part and then bent inwards from the middle part to the end point to form a side surface with a twisted smooth curved surface.

Further, with the extrusion motion as the positive direction, along the extrusion motion direction, the bending deformation from the starting point to the middle part of the first rib of the first section of the right-handed mixing rotor and the second rib of the second section of the right-handed mixing rotor of the screw rod I are both leftwards bent;

and the bending deformation from the starting point to the middle part of the bead III of the first section of the left-handed mixing rotor and the bead IV of the second section of the left-handed mixing rotor of the screw rod II is rightward bending.

Furthermore, the lead of the first section right-handed mixing rotor of the first screw is equal to the lead of the first section left-handed mixing rotor of the second screw, and the lead of the second section right-handed mixing rotor of the second screw is equal to the lead of the second section left-handed mixing rotor of the second screw;

the lead of the right-handed banburying rotor at the first section is smaller than that of the right-handed banburying rotor at the second section.

Furthermore, the rotating direction of the first screw rod along the center line of the first screw rod and the rotating direction of the second screw rod along the center line of the second screw rod are both the directions that one rotates inwards relative to the other;

in the process that the first screw and the second screw rotate relatively towards each other, on the same section, when one rib I of the first section of the right-handed banburying rotor of the first screw is a peak, one rib III of the first section of the left-handed banburying rotor of the second screw is a peak; on the same section, when one rib two of the second section of the right-handed mixing rotor of the first screw rod is a peak, one rib four of the second section of the left-handed mixing rotor of the second screw rod is a peak.

Further, the distance between the peak of the crest of the first rib of the first section of right-handed mixing rotor or the second rib of the second section of right-handed rotator of the first screw and the inner wall of the mixing chamber of the granulator is not greater than the distance between the peak of the first feeding section or the right-handed buffer section and the inner wall of the mixing chamber of the granulator;

and the distance between the crest of the third rib of the first section of the left-handed mixing rotor of the screw II or the crest of the fourth rib of the second section of the left-handed mixing rotor of the screw II and the inner wall of the granulator is not greater than the distance between the crest of the second feeding section or the left-handed buffer section and the inner wall of the mixing chamber of the granulator.

Furthermore, the bottom diameters of the first mounting section of the first screw and the second mounting section of the second screw are increased in a three-step manner from one end to the other end;

the other end of the first mounting section is the end, connected with the first feeding section of the screw rod, of the first mounting section;

and the other end of the mounting section II is the end of the mounting section II connected with the feeding section II of the screw rod II.

The bottom diameters of the first connecting section of the first screw rod and the second connecting section of the second screw rod are reduced in a two-step mode from one end to the other end;

the one end of the first connecting section is the end of the first connecting section, which is connected with the second section of the right-handed internal mixing rotor of the first screw rod, and the other end of the first connecting section is the terminal of the first screw rod; the one end of the second connecting section is the end of the second connecting section connected with the second left-handed internal mixing rotor of the second screw rod, and the other end of the second connecting section is the terminal of the second screw rod;

a first central cooling water channel extending into the first screw rod is formed in the center of the other end of the first connecting section, a second central cooling water channel extending into the second screw rod is formed in the center of the second connecting section, and the first central cooling water channel and the second central cooling water channel are stepped holes;

the small-diameter section of the first central cooling water channel extends from the first connecting section of the first screw rod to be close to the other end of the first mounting section, and the small-diameter section of the second central cooling water channel extends from the second connecting section of the second screw rod to be close to the other end of the second mounting section;

the other end face of the connecting section I is annularly provided with at least two first threaded holes along the center of the large-diameter section of the central cooling water channel I, and the other end face of the connecting section II is annularly provided with at least two second threaded holes along the center of the large-diameter section of the central cooling water channel II.

Through the technical scheme, the invention has the beneficial effects that:

the combined first-section right-handed internal mixing rotor, the combined first-section left-handed internal mixing rotor and the combined second-section right-handed internal mixing rotor and the combined second-section left-handed internal mixing rotor are adopted, the left-handed internal mixing rotor, the right-handed internal mixing rotor and the buffer section are effectively arranged and combined to form the incongruous parallel double screws integrally, the raw materials are subjected to twice high extrusion and low shearing effects to achieve good dispersive mixing and distributive mixing, compared with the traditional parallel double screw structure, the combined internal mixing rotor structure is beneficial to conveying, mixing and grinding of the raw materials, can effectively reduce shearing heat and damage the molecular chain structure of the raw materials due to shearing overheating, provides good shearing effect, has good coating property and high filling quantity, and greatly improves the quality of the produced stone paper products; meanwhile, a central cooling water channel is additionally arranged, so that the raw materials are effectively prevented from being degraded due to overheating in the banburying process.

Drawings

FIG. 1 is a schematic structural diagram of an incongruous parallel twin screw for a stone paper continuous internal mixing granulator.

The reference numbers in the drawings are as follows: the mounting section I is 1, the mounting section II is 2, the feeding section I is 3, the feeding section II is 4, the first section dextrorotation banburying rotor is 5, the first section levogyration banburying rotor is 6, the dextrorotation buffer section is 7, the levogyration buffer section is 8, the second section dextrorotation banburying rotor is 9, the second section levogyration banburying rotor is 10, the connection section I is 11, the connection section II is 12, the central cooling water channel I is 13, the central cooling water channel II is 14, the threaded hole I is 15, and the threaded hole II is 16.

Detailed Description

The invention is further described with reference to the following figures and detailed description:

as shown in figure 1, the counter-rotating parallel double screws for the stone paper continuous banburying granulator comprise a first screw and a second screw which are arranged in parallel at intervals, wherein the first screw and the second screw are arranged in counter-rotating mode at two sides of a center line between the first screw and the second screw in mirror symmetry; the screw rod I comprises a mounting section I1, a feeding section I3, a first section right-handed internal mixing rotor 5, a right-handed buffer section 7 and a second section right-handed internal mixing rotor 9 which are sequentially adjacent and coaxially arranged from left to right; the second screw comprises a second mounting section 2, a second feeding section 4, a first left-handed banburying rotor 6, a left-handed buffer section 8 and a second left-handed banburying rotor 10 which are sequentially, adjacently and coaxially arranged from left to right.

Specifically, the feeding section I3 of the screw I and the feeding section II 4 of the screw II are arranged in different directions formed by mirror symmetry about the central lines of the screw I and the screw II, so that the effect of forward conveying of the stone paper formula raw material entering through a feeding port of the granulator is realized; the first section of right-handed internal mixing rotor 5 of the first screw and the first section of left-handed internal mixing rotor 6 of the second screw are arranged in different directions formed by mirror symmetry about the central lines of the first screw and the second screw, so that the first high extrusion and low shearing action on the raw materials of the stone paper formula are formed; the right-handed buffer section 7 of the first screw and the left-handed buffer section 8 of the second screw are arranged in different directions formed by mirror symmetry about the central lines of the first screw and the second screw, so that pressure release of the raw materials of the stone paper formula subjected to the first high extrusion and low shearing action is realized; the second section of right-handed banburying rotor 9 of the first screw and the second section of left-handed banburying rotor 10 of the second screw are arranged in a different direction relative to the central lines of the first screw and the second screw, so that the second high extrusion and low shearing effects on the raw materials of the stone paper formula are formed.

In the invention, the spiral direction of the spiral edge of the feeding section I3 of the screw I is the same as that of the spiral edge of the right-handed buffer section 7, and the spiral direction of the spiral edge of the feeding section II 4 of the screw II is the same as that of the spiral edge of the left-handed buffer section 8; the first section of right-handed mixing rotor 5 of the screw rod I is provided with at least two first ribs protruding outwards along the circumferential direction, and the second section of right-handed mixing rotor 9 is provided with at least two second ribs protruding outwards along the circumferential direction; the first left-handed mixing rotor 6 of the screw rod II is provided with at least two ribs III protruding outwards along the circumferential direction, and the second left-handed mixing rotor 10 is provided with at least two ribs IV protruding outwards along the circumferential direction.

The starting point and the end point of the first rib of the first section of the right-handed mixing rotor 5 of the screw rod I are on the central line of the screw rod I, and the first rib of the first section of the right-handed mixing rotor 5 is bent and deformed outwards from the starting point to the middle part and then bent and deformed inwards from the middle part to the end point to form a side surface with a twisted smooth curved surface; the starting point and the end point of a second rib of the second section of right-handed mixing rotor 9 are on the central line of the first screw rod, and the first rib of the second section of right-handed mixing rotor 9 is bent and deformed outwards from the starting point to the middle part and then bent and deformed inwards from the middle part to the end point to form a side surface with a twisted smooth curved surface; the starting point and the end point of the first section of the left-handed mixing rotor 6 of the screw rod II are on the central line of the screw rod II, and the bead III of the first section of the left-handed mixing rotor 6 is bent outwards from the starting point to the middle part and then is bent inwards from the middle part to the end point to form a side surface with a twisted smooth curved surface; the starting point and the end point of the second left-handed mixing rotor 10 are on the central line of the second screw, and the bead IV of the second left-handed mixing rotor 10 is bent outwards from the starting point to the middle part and then is bent inwards from the middle part to the end point to form a side surface with a twisted smooth curved surface.

It should be noted that, taking the extrusion motion as the forward direction, along the extrusion motion direction, the bending deformation from the starting point to the middle part of the first rib of the first section of the right-handed internal mixing rotor 5 and the second rib of the second section of the right-handed internal mixing rotor 9 of the screw rod I are both leftward bending; and the bending deformation from the starting point to the middle part of the bead III of the first section left-handed mixing rotor 6 of the screw II and the bead IV of the second section left-handed mixing rotor 10 of the screw II is rightward bending.

In addition, the lead of the right-handed mixing rotor 5 in the first section of the screw I is equal to the lead of the left-handed mixing rotor 6 in the first section of the screw II, and the lead of the right-handed mixing rotor 9 in the second section of the screw II is equal to the lead of the left-handed mixing rotor 10 in the second section of the screw II; the lead of the right-handed mixing rotor 5 in the first section is smaller than the lead of the right-handed mixing rotor 9 in the second section.

The rotating direction of the first screw along the center line of the first screw and the rotating direction of the second screw along the center line of the second screw are both the directions that one rotates inwards relative to the other; in the process that the first screw and the second screw rotate relatively towards each other, on the same section, when one rib I of the right-handed banburying rotor 5 of the first section of the first screw is a peak, one rib III of the left-handed banburying rotor 6 of the first section of the second screw is a peak; on the same section, when one rib two of the right-handed mixing rotor 9 in the second section of the screw rod one is a peak, one rib four of the left-handed mixing rotor 10 in the second section of the screw rod two is a peak.

The distance between the crest of the first rib of the first section of the right-handed mixing rotor 5 or the crest of the second rib of the second section of the right-handed rotor of the first screw and the inner wall of the mixing chamber of the granulator is not greater than the distance between the crest of the first feeding section 3 or the crest of the right-handed buffer section 7 and the inner wall of the mixing chamber of the granulator; the distance between the crest of the bead III of the first left-handed banburying rotor 6 of the screw II or the crest of the bead IV of the second left-handed banburying rotor 10 of the screw II and the inner wall of the granulator is not more than the distance between the crest of the feeding section II 4 or the left-handed buffer section 8 and the inner wall of the banburying chamber of the granulator.

The bottom diameters of the first mounting section 1 of the first screw and the second mounting section 2 of the second screw are increased in a three-step mode from one end to the other end; the one end of the mounting section I1 is the end, extending out of the mixing chamber of the granulator and connected with the mixing chamber of the granulator in a speed ratio gear transmission mode, of the mounting section I1, and the other end of the mounting section I1 is the end, connected with the feeding section I3 of the screw rod I, of the mounting section I1; the one end of the second mounting section 2 is the one end of the second mounting section 2, which extends out of the mixing chamber of the granulator and is in transmission connection with a speed ratio gear outside the mixing chamber, and the other end of the second mounting section 2 is the one end of the second mounting section 2, which is connected with the second feeding section 4 of the second screw rod.

The invention also comprises a first connecting section 11 connected with the second section of right-handed banburying rotor 9 of the first screw and a second connecting section 12 connected with the second section of left-handed banburying rotor 10 of the second screw, wherein the bottom diameters of the first connecting section 11 of the first screw and the second connecting section 12 of the second screw are reduced in a two-step mode from one end to the other end; the one end of the first connecting section 11 is the end of the first connecting section 11 connected with the second section of the right-handed internal mixing rotor 9 of the first screw rod, and the other end of the first connecting section 11 is the terminal of the first screw rod; the one end of the second connecting section 12 is the end of the second connecting section 12 connected with the second left-handed banburying rotor 10 of the second screw rod, and the other end of the second connecting section 12 is the terminal of the second screw rod; a first central cooling water channel 13 extending into the first screw rod is formed in the center of the other end of the first connecting section 11, a second central cooling water channel 14 extending into the second screw rod is formed in the center of the second connecting section 12, and the first central cooling water channel 13 and the second central cooling water channel 14 are stepped holes; the small-diameter section of the central cooling water channel I13 extends from the connecting section I11 of the screw I to the other end close to the mounting section I1, and the small-diameter section of the central cooling water channel II 14 extends from the connecting section II 12 of the screw II to the other end close to the mounting section II 2; the other end face of the connecting section I11 is provided with at least two first threaded holes 15 along the large-diameter section center ring of the central cooling water channel I13, and the other end face of the connecting section II 12 is provided with at least two second threaded holes 16 along the large-diameter section center ring of the central cooling water channel II 14.

The working principle is as follows: the raw materials are continuously conveyed to the first section of right-handed mixing rotor 5 and the first section of left-handed mixing rotor 6 under the propelling action formed by the feeding section I3 and the feeding section II 4, the bead I of the first section of right-handed mixing rotor 5 and the bead III of the first section of left-handed mixing rotor 6 are always in two peak-to-peak meeting, therefore, the raw materials are subjected to high extrusion and low shearing action brought by the counter-rotation formed by the first section of right-handed mixing rotor 5 and the first section of left-handed mixing rotor 6, the long molecular chains of the stone paper high molecular raw materials are effectively kept, under the action of a small amount of processing aids, the raw materials are further subjected to cross-linking reaction to form a branched chain and a net structure, a large amount of calcium carbonate powder is fully wrapped, under the condition that only 1.5% of processing aids are used, the maximum filling proportion of calcium carbonate can reach 85%, the wrapping performance is good, the filling amount is high, and when the filling amount, the production effect of the stone paper is optimal;

after the raw materials are subjected to the first high extrusion and low shearing action, a pressure release process is provided according to the process requirements, so that the melting, mixing and crosslinking reactions of the raw materials are more sufficient, and the melting, mixing and crosslinking reactions are performed at the right-handed buffer section 7 and the left-handed buffer section 8;

then, the material enters the second section of right-handed mixing rotor 9 and the second section of left-handed mixing rotor 10, the second rib of the second section of right-handed mixing rotor 9 and the fourth rib of the second section of left-handed mixing rotor 10 meet by two peaks all the time, the material is subjected to the second high extrusion and low shearing action, the mixing effect is fully achieved, the socket-shaped backflow is formed at the tail ends of the second section of right-handed mixing rotor 9 and the second section of left-handed mixing rotor 10 along with the movement, the mixed material is extruded into the first screw rod and the second screw rod, and the next procedure is carried out.

The above embodiments are merely preferred embodiments of the present invention, and not intended to limit the scope of the invention, so that equivalent changes or modifications made based on the structure, characteristics and principles of the invention should be included in the scope of the claims of the present invention.