阅读说明：本技术 一种橡胶挤出机 (Rubber extruder ) 是由 潘家芳 黄发国 于 2020-06-05 设计创作，主要内容包括：本发明提供一种橡胶挤出机,属于橡胶挤出机械技术领域。该橡胶挤出机包括机筒、进料口、出料口,机筒内设有快速螺杆和慢速螺杆,快速螺杆和慢速螺杆均分为喂料段、塑化段和输送段；喂料段和输送段上分别设有螺旋方向相反且相互啮合的输送螺纹,快速螺杆的喂料段的螺旋数量少于慢速螺杆的喂料段的螺旋数量,快速螺杆输送段的螺旋数量少于慢速螺杆输送段的螺旋数量。塑化段设有哑铃状的塑化元件；塑化元件在螺杆的长度方向呈螺旋状布置；机筒上方的喂料装置通过一对对向旋转的喂料齿轮喂料。本发明通过对橡胶挤出机喂料方式、挤出螺杆的各段结构进行创新型改进,以在工艺许可的挤出胶温范围内实现喂料能力、挤出产量和塑化效果的提升。(The invention provides a rubber extruder, and belongs to the technical field of rubber extrusion machinery. The rubber extruder comprises a machine barrel, a feeding hole and a discharging hole, wherein a quick screw and a slow screw are arranged in the machine barrel and are divided into a feeding section, a plasticizing section and a conveying section; the feeding section and the conveying section are respectively provided with conveying threads which are opposite in spiral direction and mutually meshed, the spiral number of the feeding section of the rapid screw is less than that of the feeding section of the slow screw, and the spiral number of the conveying section of the rapid screw is less than that of the conveying section of the slow screw. The plasticizing section is provided with a dumbbell-shaped plasticizing element; the plasticizing element is spirally arranged in the length direction of the screw; the feeding device above the cylinder is fed by a pair of feeding gears which rotate oppositely. The invention improves the feeding capacity, the extrusion yield and the plasticizing effect within the extrusion glue temperature range allowed by the process by innovatively improving the feeding mode of the rubber extruder and the structures of all sections of the extrusion screw.)

1. A rubber extruder, characterized in that: the device comprises a machine barrel, wherein a fast screw and a slow screw are horizontally arranged in the machine barrel in parallel, two ends of the fast screw and the slow screw are rotatably connected with a bearing seat on the outer side of the end part of the machine barrel through bearings, and one end of the fast screw and/or one end of the slow screw are/is driven to rotate by a first power device; the fast screw and the slow screw are divided into a feeding section, a plasticizing section and a conveying section; the feeding section of the rapid screw is aligned with the feeding section of the slow screw, the feeding section of the rapid screw and the feeding section of the slow screw are provided with conveying threads which are opposite in spiral direction and mutually meshed, and the spiral number of the feeding section of the rapid screw is less than that of the feeding section of the slow screw; the plasticizing section of the rapid screw is aligned with the plasticizing section of the slow screw and is provided with plasticizing elements; the conveying section of the rapid screw is aligned with the conveying section of the slow screw, the conveying sections of the rapid screw and the slow screw are provided with conveying threads which are opposite in spiral direction and mutually meshed, and the spiral number of the conveying section of the rapid screw is less than that of the conveying section of the slow screw;

the plasticizing sections of the fast screw and the slow screw are both cylindrical columnar structures; the plasticizing element comprises an installation part and a dumbbell part, wherein the installation part is a circular ring arranged at the outer side of the plasticizing section at intervals; the dumbbell parts comprise columnar rods and spheres positioned at two ends of the columnar rods, the middle parts of the columnar rods are obliquely fixed on the installation parts, a plurality of dumbbell parts are arranged on each installation part on the rapid screw plasticizing section, and the dumbbell parts on the adjacent installation parts are installed in a staggered mode, so that all the dumbbell parts are spirally arranged when viewed along the length direction of the rapid screw; on the slow screw plasticizing section, each mounting part is provided with a plurality of dumbbell parts, and the dumbbell parts on adjacent mounting parts are mounted in a staggered manner, so that all the dumbbell parts are spirally arranged when viewed along the length direction of the slow screw; the number of the dumbbell parts on the fast screw is less than that of the dumbbell parts on the slow screw;

the top of the machine barrel is provided with a feed inlet, the bottom of the machine barrel is provided with a discharge outlet, and the feed inlet is positioned above the quick screw feeding section and the slow screw feeding section; and the discharge port is positioned below the quick screw conveying section and the slow screw conveying section.

2. The rubber extruder as claimed in claim 1, wherein: the structure of the feeding section of the rapid screw is the same as that of the conveying section of the rapid screw; the structure of the feeding section of the slow screw is the same as that of the conveying section of the slow screw; and the ratio of the number of spirals of the feeding section of the fast screw to the number of spirals of the feeding section of the slow screw is 1:2, 1:3 or 1: 4.

3. The rubber extruder as claimed in claim 1, wherein: a feeding machine barrel is further arranged above the feeding hole, a feeding hole is formed in the upper end of the feeding machine barrel, a discharging hole is formed in the lower end of the feeding machine barrel, two feeding gears capable of rotating in opposite directions are arranged in a cavity in the feeding machine barrel side by side, a meshing position between the two feeding gears is located right below the feeding hole and right above the discharging hole and the feeding hole, and when the two feeding gears rotate in opposite directions, rubber materials are extruded to the lower side and then fall to the meshing position between the fast screw and the slow screw through the feeding hole; and a gear shaft is fixedly sleeved at the center of the inner side of each feeding gear, two ends of the gear shaft penetrate through the upper feeding machine barrel and are rotationally connected with a feeding gear bearing seat through a bearing, the feeding gear bearing seats are arranged on the outer sides of two ends of the upper feeding machine barrel, and one end of the gear shaft penetrates through the feeding gear bearing seats and is driven to rotate by a second power device.

4. A rubber extruder as claimed in claim 1,2 or 3, wherein: the installation parts on the fast screw and the installation parts on the slow screw are aligned one by one, the number of the dumbbell parts on each installation part on the fast screw is the same, the number of the dumbbell parts on each installation part on the slow screw is the same, and the ratio of the number of the dumbbell parts on each installation part on the fast screw to the number of the dumbbell parts on each installation part on the slow screw is 1:2, 1:3 or 1: 4.

5. The plasticizing apparatus of a rubber extruder as set forth in claim 1, wherein: the included angle between the central axis of the columnar rod and the central axis of the screw rod in which the columnar rod is arranged is 8-12 degrees.

6. The plasticizing apparatus of a rubber extruder as set forth in claim 1, wherein: the diameter of the plasticizing section of the rapid screw is equal to that of the plasticizing section of the slow screw; the cylindrical rod is a cylindrical rod, the diameter of the cylindrical rod is 1/9-1/7 of the working diameter of the outer surface of the plasticizing section, the diameter of the sphere is 1/6-1/4 of the working diameter of the outer surface of the plasticizing section, and the distance between the centers of the spheres at two ends of the same cylindrical rod is 3/8-5/8 of the working diameter of the outer surface of the plasticizing section.

7. The plasticizing apparatus of a rubber extruder as set forth in claim 1, wherein: the distance between column pole middle part and the plastify section surface is 1/32 ~ 3/32 of plastify section surface working diameter, and the installation department distributes at plastify section surface equidistance, and the distance between the adjacent installation department is 7/10 ~ 1 of plastify section surface working diameter.

8. The plasticizing apparatus of a rubber extruder as set forth in claim 4, wherein: the length ratios of the feeding section, the plasticizing section and the conveying section on the fast screw and the slow screw are all 4: 6-10: 3-5.

9. The plasticizing apparatus of a rubber extruder as set forth in claim 1, wherein: the fast screw and the slow screw are respectively driven to rotate by different power devices, and the spiral structure of the fast screw is a single spiral or a double spiral; the spiral structure of the slow screw is four-spiral, six-spiral or eight-spiral.

10. A method for controlling a rubber extruder, characterized in that the rotational speed of a fast screw is controlled to be 1.1 to 8.0 times the rotational speed of a slow screw by using the rubber extruder as claimed in any one of claims 1 to 9.

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of rubber extrusion machinery, in particular to a rubber extruder.

[ background of the invention ]

Most of the existing cold feeding rubber extruders adopt single-screw extruders, and a small part of the existing cold feeding rubber extruders adopt double-screw extruders. The single-screw rubber cold-feeding pin barrel extruder is characterized in that rubber materials fed into the extruder are stirred, mixed, heated, plasticized and the like under the combined action of a screw, a barrel and pins, and finally the rubber materials are subjected to shaping extrusion through a machine head at a certain extrusion temperature. In the process, the extrusion capacity, the extrusion temperature and the plasticizing capacity are in a 'magic triangle' relationship which is mutually associated, and it is almost impossible to ensure that the three are simultaneously optimal.

The process target of the cold feeding extruder is to achieve the highest extrusion yield and the best plasticizing effect on the premise of controllable extrusion glue temperature. The basic design of a cold-feed extruder is to load an integral screw into a pin barrel having an inside diameter slightly larger than the outside diameter of the screw, with the primary extrusion processing zone of the compound being formed between the inside surface of the barrel and the outside surface of the screw. The material characteristics of the rubber material in the extrusion processing process are changed section by section, the rubber material can be divided into three areas of solid conveying, plasticizing and melting and melt conveying along the extrusion direction according to the change characteristics of the rubber material state, the three areas are also called as a feeding section, a plasticizing section and an extrusion section of the extruder, and different functional sections have different screw ridge structure designs and pin arrangement types. The rubber material in the feeding section is in a high elastic state, the rubber material in the plasticizing section is converted from the high elastic state to a viscous state, and the rubber material in the extruding section is in the viscous state. For the convenience of analytical research, the extrusion yield, plasticizing effect and extrusion gel temperature are defined as three factors of extrusion performance; the feeding, plasticizing and extruding are defined as three elements of extruding function, and the existing extruding mechanism which adopts the same barrel screw component combination to synchronously realize the three elements of feeding, plasticizing and extruding is vividly summarized into a three-section synchronous extruding mechanism of 1-1-1.

The current extrusion theory research and production practice prove that the three elements of the extrusion performance cannot reach an ideal high-effective value area simultaneously, if the extrusion yield is to be improved, the plasticizing effect must be reduced, and the temperature of the extruded glue is increased; in order to improve the plasticizing effect, it is necessary to reduce the extrusion gel temperature and the extrusion yield at the same time. The three parts present a magic triangle phenomenon of mutual restriction. Therefore, in the practice of extrusion production, only the temperature range of the extrusion glue permitted by the process can be selected to achieve the balance of extrusion yield and plasticizing effect.

The improvement of extrusion output and plasticizing effect can be started from two aspects of feeding and plasticizing, and most of the feeding devices of the existing cold feeding rubber extruders adopt a mode of forced feeding by a feeding roller, and the feeding roller and a screw rotate in opposite directions, so that flaky rubber is eaten into the extruders. But the feeding capacity is unstable due to the feeding mode of the feeding roller, which is shown in the process capacity C_PThe quality stability and uniformity of extruded products cannot meet the requirement of high-grade radial tires on high quality consistency due to the fact that the feeding capacity and the plasticizing capacity are not matched well. In addition, the production efficiency of forced feeding of the feeding roller is not very high, the number of parts is large, the mechanical structure for preventing rubber leakage is complex, the requirement on matching precision is high, and rubber easily permeates into a bearing after the parts are abraded to cause the damage of the bearing, so that the failure rate of the feeding device is high. The industry has therefore been seeking more advanced feeding methods.

In view of the above, the invention provides a novel rubber extruder, and innovative improvements are made on the feeding mode, the structures of the feeding section, the plasticizing section and the conveying section of the extrusion screw, so as to achieve the improvement of the extrusion yield and the plasticizing effect within the extrusion glue temperature range permitted by the process, and reduce the magic triangle contradiction within the feasible range.

[ summary of the invention ]

The invention aims to: aiming at the existing problems, the rubber extruder is provided, and the structure of the feeding device and the structures of all sections of the extrusion screw are innovatively improved, so that the feeding capacity, the extrusion yield and the plasticizing effect are improved within the extrusion rubber temperature range allowed by the process, and the magic triangle contradiction is reduced within a feasible range.

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

a rubber extruder comprises a machine barrel, wherein a fast screw and a slow screw are horizontally arranged in the machine barrel in parallel, two ends of the fast screw and two ends of the slow screw are both rotationally connected with a bearing seat on the outer side of the end part of the machine barrel through bearings, and one end of the fast screw and/or one end of the slow screw are/is driven to rotate by a first power device; the fast screw and the slow screw are divided into a feeding section, a plasticizing section and a conveying section; the feeding section of the rapid screw is aligned with the feeding section of the slow screw, the feeding section of the rapid screw and the feeding section of the slow screw are provided with conveying threads which are opposite in spiral direction and mutually meshed, and the spiral number of the feeding section of the rapid screw is less than that of the feeding section of the slow screw; the plasticizing section of the rapid screw is aligned with the plasticizing section of the slow screw and is provided with plasticizing elements; the conveying section of the rapid screw is aligned with the conveying section of the slow screw, the conveying sections of the rapid screw and the slow screw are provided with conveying threads which are opposite in spiral direction and mutually meshed, and the spiral number of the conveying section of the rapid screw is less than that of the conveying section of the slow screw;

the plasticizing sections of the fast screw and the slow screw are both cylindrical columnar structures; the plasticizing element comprises an installation part and a dumbbell part, wherein the installation part is a circular ring arranged at the outer side of the plasticizing section at intervals; the dumbbell parts comprise columnar rods and spheres positioned at two ends of the columnar rods, the middle parts of the columnar rods are obliquely fixed on the installation parts, a plurality of dumbbell parts are arranged on each installation part on the rapid screw plasticizing section, and the dumbbell parts on the adjacent installation parts are installed in a staggered mode, so that all the dumbbell parts are spirally arranged when viewed along the length direction of the rapid screw; on the slow screw plasticizing section, each mounting part is provided with a plurality of dumbbell parts, and the dumbbell parts on adjacent mounting parts are mounted in a staggered manner, so that all the dumbbell parts are spirally arranged when viewed along the length direction of the slow screw; the number of the dumbbell parts on the fast screw is less than that of the dumbbell parts on the slow screw;

the top of the machine barrel is provided with a feed inlet, the bottom of the machine barrel is provided with a discharge outlet, and the feed inlet is positioned above the quick screw feeding section and the slow screw feeding section; and the discharge port is positioned below the quick screw conveying section and the slow screw conveying section.

In the invention, preferably, the structure of the feeding section of the rapid screw is the same as that of the conveying section of the rapid screw; the structure of the feeding section of the slow screw is the same as that of the conveying section of the slow screw; and the ratio of the number of spirals of the feeding section of the fast screw to the number of spirals of the feeding section of the slow screw is 1:2, 1:3 or 1: 4.

In the invention, preferably, a feeding cylinder is further arranged above the feeding hole, a feeding port is formed in the upper end of the feeding cylinder, a discharging port is formed in the lower end of the feeding cylinder, two feeding gears capable of rotating in opposite directions are arranged in a cavity in the feeding cylinder side by side, a meshing position between the two feeding gears is positioned right below the feeding port and right above the discharging port and the feeding hole, and when the two feeding gears rotate in opposite directions, rubber materials are extruded to the lower side and then fall to the meshing position between the fast screw and the slow screw through the feeding hole; and a gear shaft is fixedly sleeved at the center of the inner side of each feeding gear, two ends of the gear shaft penetrate through the upper feeding machine barrel and are rotationally connected with a feeding gear bearing seat through a bearing, the feeding gear bearing seats are arranged on the outer sides of two ends of the upper feeding machine barrel, and one end of the gear shaft penetrates through the feeding gear bearing seats and is driven to rotate by a second power device.

In the invention, preferably, the mounting parts on the fast screw and the mounting parts on the slow screw are aligned one by one, the number of the dumbbell parts on each mounting part on the fast screw is the same, the number of the dumbbell parts on each mounting part on the slow screw is the same, and the ratio of the number of the dumbbell parts on each mounting part on the fast screw to the number of the dumbbell parts on each mounting part on the slow screw is 1:2, 1:3 or 1: 4.

In the invention, preferably, the included angle between the central axis of the columnar rod and the central axis of the screw on which the columnar rod is arranged is 8-12 degrees.

In the invention, preferably, the diameter of the plasticizing section of the fast screw is equal to that of the plasticizing section of the slow screw; the cylindrical rod is a cylindrical rod, the diameter of the cylindrical rod is 1/9-1/7 of the working diameter of the outer surface of the plasticizing section, the diameter of the sphere is 1/6-1/4 of the working diameter of the outer surface of the plasticizing section, and the distance between the centers of the spheres at two ends of the same cylindrical rod is 3/8-5/8 of the working diameter of the outer surface of the plasticizing section.

In the invention, preferably, the distance between the middle part of the columnar rod and the outer surface of the plasticizing section is 1/32-3/32 of the working diameter of the outer surface of the plasticizing section, the mounting parts are distributed on the outer surface of the plasticizing section at equal intervals, and the distance between the adjacent mounting parts is 7/10-1 of the working diameter of the outer surface of the plasticizing section.

In the present invention, preferably, the ratio of the lengths of the feeding section, the plasticizing section and the conveying section on the fast screw and the slow screw is 4: 6-10: 3-5.

In the invention, preferably, the fast screw and the slow screw are respectively driven to rotate by different power devices, and the spiral structure of the fast screw is a single spiral or a double spiral; the spiral structure of the slow screw is four-spiral, six-spiral or eight-spiral.

The invention also provides a control method of the rubber extruder, and when the rubber extruder is used, the rotating speed of the fast screw is controlled to be 1.1-8.0 times of that of the slow screw.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. in the invention, the screw comprises a feeding section, a plasticizing section and a conveying section which are sequentially arranged, the outer side walls of the feeding section and the conveying section are respectively provided with a conveying thread, and the function of the screw is more important than the conveying of sizing materials; the plasticizing section is of a cylindrical structure, the dumbbell-shaped plasticizing element is arranged on the outer side wall of the plasticizing section, and the function of the plasticizing section is mainly that of stirring, mixing and plasticizing.

2. The pin type pin shear device improves the existing pin type structure into the dumbbell type structure, the spheres at two ends of the dumbbell type structure can enable the shearing contact surface to be larger, the arrangement direction of the columnar rod changes the shearing direction of the original pin type pin, the shapes and the sizes of all parts of the dumbbell type structure are different, and the mixing, stirring and shearing effects are increased under the combined action of the factors, so that the plasticizing effect is improved. The dumbbell-shaped structures are arranged on the screw in a staggered mode, and the dumbbell parts are arranged in a spiral mode when viewed from the length direction of the screw, so that on one hand, the plasticizing device arranged in a spiral mode has plasticizing capacity, and meanwhile, the conveying effect is kept; on the other hand, the pin of the existing pin type structure is fixed on the inner wall of the machine barrel, the pin cannot rotate in the working process, and the rubber material is sheared and plasticized while flowing; the dumbbell-shaped structure is fixed on the outer wall of the screw and can rotate along with the rotation of the screw, so that the stirring and shearing strength of the dumbbell-shaped structure on the rubber is enhanced, the shearing action enables the rubber in the machine barrel to be subjected to acting force on the whole, and the rubber is mixed and stirred more uniformly.

3. The invention also arranges two screws in parallel, the number of the screws of the conveying section of the slow screw and the number of the screws of the conveying section of the fast screw are in a multiple relation, the number of the dumbbell parts on each mounting part on the plasticizing section of the slow screw and the number of the dumbbell parts on each mounting part on the plasticizing section of the fast screw are in an integral multiple relation, and the dumbbell-shaped structures of the two screws are partially meshed with each other.

4. When the size proportion of each part of the screw is set, parameters such as the diameter of the cylindrical rod, the diameter of the sphere, the center distance of the sphere, the distance between the cylindrical rod and the plasticizing section, the distance between the installation parts and the like are designed, so that the balance between more compact layout, lower material cost, more plasticizing effect and higher yield can be obtained.

5. Feeding in the present inventionThe feeding device is improved aiming at the feeding mode of the existing cold feeding rubber extruder, the existing feeding mode of matching the feeding roller and the feeding screw is improved into the mode of feeding by the feeding screw after double-gear feeding, the gear feeding is stable conveying, the stability of the conveying capacity is very high, and the process capacity C is shown_PThe feeding speed can be adjusted in a following manner by matching with the plasticizing capacity to adapt to the improvement of the plasticizing capacity, so that the extrusion stability, the uniformity and the yield of the invention are improved, and the technical requirements of high-quality radial tire production on higher extrusion stability and uniformity are met.

[ description of the drawings ]

FIG. 1 is a schematic plan view of a rubber extruder according to the present invention;

FIG. 2 is a cross-sectional view taken along A-A of FIG. 1;

FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;

FIG. 4 is a cross-sectional view taken along the line C-C of FIG. 1;

FIG. 5 is a schematic perspective view of a rubber extruder according to the present invention;

FIG. 6 is a schematic plan view of the fast screw of the present invention;

FIG. 7 is a schematic view of the structure of two screws used in a pair;

FIG. 8 is a cross-sectional view taken in the direction D-D of FIG. 7;

FIG. 9 is a cross-sectional view taken in the direction E-E of FIG. 7;

fig. 10 is a sectional view in the direction F-F in fig. 7.

The device comprises a 1-fast screw, a 101-feeding section, a 102-plasticizing section, a 1021-mounting section, a 1022-cylindrical rod, a 1023-sphere, a 103-conveying section, a 2-slow screw, a 201-feeding section, a 202-plasticizing section, a 2021-mounting section, a 2022-cylindrical rod, a 2023-sphere, a 203-conveying section, a 3-feeding end bearing seat, a 4-cylinder, a 401-feeding hole, a 402-discharging hole, a 5-discharging end bearing seat, a 6-bearing I, a 7-bearing II, an 8-bearing III, a 9-feeding cylinder, a 901-feeding hole, a 902-discharging hole, a 10-feeding gear, an 11-feeding gear bearing seat, a 12-gear shaft and a 13-rubber leakage preventing device.

[ detailed description ] embodiments

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The drawings are only for purposes of illustration and are not intended to be limiting, certain elements of the drawings may be omitted, enlarged or reduced to better illustrate the embodiments of the present invention, and do not represent the size of the actual product, and it is understood that some well-known structures, elements and descriptions thereof in the drawings may be omitted for persons skilled in the art.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The invention aims to improve the feeding capacity, the yield and the plasticizing effect by innovatively improving the feeding mode of a rubber extruder and the structure of each section of an extrusion screw, and concretely introduces the rubber extruder one by one as shown in figures 1 to 10, wherein the rubber extruder comprises a machine barrel 4, a quick screw 1 and a slow screw 2 which are horizontally arranged in parallel are arranged in the machine barrel 4, two ends of the quick screw 1 and the slow screw 2 are respectively and rotationally connected with a bearing seat outside the end part of the machine barrel 4 through bearings, one end of the quick screw 1 and/or one end of the slow screw 2 are/is driven to rotate by a first power device, namely the quick screw 1 and the slow screw 2 can be driven to rotate by the same power device, the rotation motion of one screw is transmitted to the other screw through gear transmission or chain wheel transmission, the rotation speeds of the two screws are the same, but it is more preferable that the fast screw 1 and the slow screw 2 are driven to rotate by different power devices so that the rotation speeds of the two are different, and the rotation speed of the fast screw 1 is generally two times or three times or four times of that of the slow screw 2, and can be a multiple of 1.1-8.0. The fast screw 1 and the slow screw 2 are divided into a feeding section (101,201), a plasticizing section (102,202) and a conveying section (103,203), the two screws are respectively integrally formed, and the structural characteristics of all parts are different; the feeding sections 101 of the fast screw 1 and the feeding sections 201 of the slow screw 2 are aligned side by side, the feeding sections 101 of the fast screw 1 and the feeding sections 201 of the slow screw 2 are provided with conveying threads which are opposite in spiral direction and mutually meshed, the spiral number of the feeding sections 101 of the fast screw 1 is less than that of the feeding sections 201 of the slow screw 2, and preferably, the ratio of the spiral number of the feeding sections 101 of the fast screw 1 to that of the feeding sections 201 of the slow screw 2 is 1:2, 1:3 or 1: 4; specifically, it is preferable that the spiral structure of the feeding section 101 of the fast screw 1 is a single spiral or a double spiral; the spiral structure of the feeding section 201 of the slow screw 2 is four-spiral, six-spiral, or eight-spiral. Through the arrangement, during production, the conveying capacity of the two screws can be adjusted to be the same through adjusting the rotating speed, and meanwhile, two different extrusion forces are generated on the rubber material due to the difference of the screw and the rotating speed, so that the rubber material in the machine barrel is acted by two different degrees of forces, and the purposes of adjusting and improving the conveying capacity of the rubber material and enhancing plasticization are achieved.

The plasticizing section 102 of the fast screw 1 and the plasticizing section 202 of the slow screw 2 are aligned side by side and are provided with plasticizing elements.

The conveying section 103 of the fast screw 1 and the conveying section 203 of the slow screw 2 are aligned side by side, the conveying section 103 of the fast screw 1 and the conveying section 203 of the slow screw 2 are provided with conveying threads which are opposite in spiral direction and mutually meshed, the spiral number of the conveying section 103 of the fast screw 1 is less than that of the conveying section 203 of the slow screw 2, and preferably, the ratio of the spiral number of the conveying section 103 of the fast screw 1 to that of the conveying section 203 of the slow screw 2 is 1:2, 1:3 or 1: 4; specifically, it is preferable that the spiral structure of the conveying section 103 of the rapid screw 1 is a single spiral or a double spiral; the helical structure of the conveying section 203 of the slow screw 2 is four-helix, six-helix, or eight-helix. The structure of the feeding section 101 of the fast screw 1 and the structure of the conveying section 103 of the fast screw 1 can be completely the same or not completely the same; the structure of the feeding section 201 of the slow screw 2 and the structure of the conveying section 203 of the slow screw 2 can be completely the same or not.

The installation mode of the fast screw 1 and the slow screw 2 can be specifically that one ends of the fast screw 1 and the slow screw 2 close to the feeding sections (101,201) are rotatably installed in the feeding end bearing seat 3 through a second bearing 7 and a third bearing 8, the ends protrude out of the feeding end bearing seat 30, the outer side surface of the protruding part is provided with a spline groove for connecting an external first power device for driving to rotate (the power device is not shown), and the feeding end bearing seat 3 can be fixed on the outer side wall of one end of the machine barrel 4 through a bolt. The other ends of the fast screw 1 and the slow screw 2 close to the conveying sections (103,203) are rotatably connected with a discharge end bearing seat 5 through a bearing I6.

The structure improvement of the plasticizing sections (102,202) is described below, and referring to fig. 6-10, the plasticizing section 102 of the fast screw 1 and the plasticizing section 202 of the slow screw 2 are both cylindrical columnar structures; the plasticizing element comprises mounting parts (1021, 2021) and a dumbbell part, wherein the mounting parts (1021, 2021) are circular rings arranged at intervals outside the plasticizing sections (102,202), and can be fixed with the outer side walls of the plasticizing sections (102,202) in a welding mode; the dumbbell part comprises a columnar rod (1023,2023) and spheres (1023,2023) positioned at two ends of the columnar rod (1023,2023), the middle part of the columnar rod (1023,2023) is obliquely fixed on the mounting parts (1021, 2021), preferably fixed in a welding mode, and the included angle between the central axis of the columnar rod (1023,2023) and the central axis of the screw rod in which the columnar rod is positioned is preferably 8-12 degrees, and more preferably 10 degrees. On the plasticizing section 102 of the rapid screw 1, a plurality of dumbbell parts are arranged on each mounting part (1021, 2021), and the dumbbell parts on adjacent mounting parts (1021, 2021) are installed in a staggered manner, so that all the dumbbell parts are spirally arranged when viewed along the length direction of the rapid screw 1; on the plasticizing section 202 of the slow screw 2, a plurality of dumbbell parts are arranged on each mounting part (1021, 2021), and the dumbbell parts on the adjacent mounting parts (1021, 2021) are installed in a staggered manner, so that all the dumbbell parts are spirally arranged when viewed along the length direction of the slow screw 2; the number of the dumbbell parts on the fast screw 1 is less than that on the slow screw 2, preferably, the mounting parts 1021 on the fast screw 1 and the mounting parts 2021 on the slow screw 2 are aligned one by one, the number of the dumbbell parts on each mounting part 1021 on the fast screw 1 is the same, the number of the dumbbell parts on each mounting part 2021 on the slow screw 2 is the same, and the ratio of the number of the dumbbell parts on each mounting part 1021 on the fast screw 1 to the number of the dumbbell parts on each mounting part 2021 on the slow screw 2 is 1:2, 1:3 or 1: 4. The pin type plastic cutting machine improves the existing pin type into a dumbbell type structure, the spherical bodies (1023,2023) at two ends can enable the cutting contact surface to be larger, the arrangement direction of the columnar rod (1023,2023) changes the cutting direction of the original mode, the shapes and the sizes of all parts of the dumbbell type structure are different, and the factors act together to increase the mixing, stirring and cutting effects, so that the plasticizing effect is improved. The columnar rod (1023,2023) is obliquely arranged, so that the dumbbell parts are spirally arranged along the length of the screw rod, the plasticizing section of the rubber material plasticizing device has the function of conveying the rubber material, and the rubber material plasticizing device is also beneficial to plasticizing of the rubber material.

The top of the machine barrel 4 is provided with a feeding hole 401, the bottom of the machine barrel 4 is provided with a discharging hole 402, and the feeding hole 401 is positioned above the feeding section of the fast screw 1 and the feeding section of the slow screw 2, particularly above the meshing part of the feeding section of the fast screw 1 and the feeding section of the slow screw 2; the discharge port 402 is located below the conveying section of the fast screw 1 and the conveying section of the slow screw 2, specifically below the meshing position of the conveying section of the fast screw 1 and the conveying section of the slow screw 2.

The invention also relates to the improvement of the feeding mode, the concrete structure is that a feeding cylinder 9 is additionally arranged above the feeding port 401, the upper end of the feeding cylinder 9 is provided with a feeding port 901, the lower end of the feeding cylinder 9 is provided with a discharging port 902, two feeding gears 10 capable of rotating in opposite directions are arranged in a cavity in the feeding cylinder 9 side by side, the meshing position between the two feeding gears 10 is positioned under the feeding port 901 and is positioned over the discharging port 902 and the feeding port 402, and when the two feeding gears 10 rotate in opposite directions, the rubber material is extruded to the lower part and then falls to the meshing position between the fast screw 1 and the slow screw 2 through the feeding port 401; a gear shaft 12 is fixedly sleeved at the center of the inner side of each feeding gear 10, two ends of the gear shaft 12 penetrate through the upper feeding cylinder 9 and are rotatably connected with a feeding gear bearing seat 11 through bearings, the feeding gear bearing seats 11 are arranged at the outer sides of two ends of the upper feeding cylinder 9, and one end of the gear shaft 12 penetrates through the feeding gear bearing seat 11 and is driven to rotate by a second power device (not shown). The central axis of the gear shaft 12 is preferably parallel to both the central axis of the fast screw 1 and the central axis of the slow screw 2. The feeding stability and the uniformity of the extruder can be improved through gear feeding, and meanwhile, the feeding speed can be adjusted in a following manner by matching with the plasticizing capacity so as to adapt to the improvement of the plasticizing capacity.

In the invention, the feeding gear 10 can be a straight gear or a helical gear, and the specific tooth form can be a standard gear or a nonstandard gear. The power means may be a separate set of gear motors and may be shared with the drive means for the fast or slow screw, i.e. the rotational movement of the screw is transmitted to the feed gear 10 by means of a gear drive or a sprocket drive, which is also conventional in the art.

In the invention, the center distance between the feeding gears 10 is adjustable to adapt to the thickness change of the films fed by the cold feeding rubber extruder. The distance adjusting device of the feeding gear can be designed into a manual adjusting mode and also can be designed into an automatic electric distance adjusting mode, and a person skilled in the art can add and improve the technical scheme.

When the screw of the present invention is implemented specifically, a person skilled in the art can perform specific size setting according to design specifications, and the screw is within the protection scope of the present invention as long as the screw meets the aforementioned technical characteristics, however, in order to achieve a balance between a more compact layout, a lower material cost, a more plasticizing effect, and a higher yield, the present invention further performs a parameter optimization, specifically, the diameter of the plasticizing section 102 of the fast screw 1 may be equal to the diameter of the plasticizing section 202 of the slow screw 2; the cylindrical rod (1023,2023) can be a cylindrical rod or a square cylindrical rod, and the specific design is described by the cylindrical rod, the diameter of the cylindrical rod (1023,2023) is 1/9-1/7, preferably 1/8, of the working diameter of the outer surface of the plasticizing section (102,202), and the diameter of the sphere is 1/6-1/4, preferably 1/5, of the working diameter of the outer surface of the plasticizing section (102, 202). The distance between the centers of the spheres at the two ends of the same cylindrical rod (1023,2023) is 3/8-5/8, preferably 1/2, of the working diameter of the outer surface of the plasticizing section (102, 202). The distance between the middle part of the columnar rod (1023,2023) and the outer surface of the plasticizing section (102,202) is 1/32-3/32, preferably 1/16, of the working diameter of the outer surface of the plasticizing section (102,202), the installation parts (1021, 2021) are distributed at equal intervals on the outer surface of the plasticizing section (102,202), and the distance between the adjacent installation parts (1021, 2021) is 7/10-1, preferably 4/5, of the working diameter of the outer surface of the plasticizing section (102, 202). The length ratios of the feeding section, the plasticizing section and the conveying section on the fast screw and the slow screw are all 4: 6-10: 3-5, preferably 1:2: 1. The relationship between the above dimensions is a preferable reference value in design, and in practical implementation, any combination of the above parameters can be preferably selected by those skilled in the art, and the invention is within the protection scope of the present invention.

Because the two ends of the feeding gear 10 are provided with tooth gaps, rubber materials overflow from the tooth gaps and are easy to damage the bearing, the invention preferably arranges the rubber material leakage prevention devices 13 at the two ends of the feeding gear 10, the outer surface of each rubber material leakage prevention device 13 is cylindrical, the cylindrical outer surface is provided with a multi-head rubber returning thread, and the spiral directions of the rubber returning threads at the two ends of the feeding gear 10 are opposite. When the feeding gear 10 rotates, the rubber can be forced to return to the meshing part of the first feeding gear 6 and the second feeding gear 7, and the rubber is prevented from leaking.

When the rubber extruder disclosed by the invention is used, rubber materials are fed from a feeding port 901 during operation, and after being extruded by a gear, the rubber materials fall into the meshing position of the fast screw 1 and the slow screw 2, and are discharged from a discharge port 402 after being plasticized and conveyed by the feeding sections (101,201), the plasticizing sections (102,202) and the conveying sections (103,203) of the fast screw 1 and the slow screw 2, in the process, the rotating speed of the fast screw 1 is controlled to be greater than that of the slow screw 2, and the rotating speed of the fast screw 1 is two times or three times or four times of that of the slow screw 2, and can also be 1.1-8.0 times.

Through the improvement of the invention, the improvement of the feeding capacity, the extrusion yield and the plasticizing effect can be realized within the extrusion glue temperature range allowed by the process, and the magic triangle contradiction is reduced within the feasible range.

The above description is intended to describe in detail the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention, and all equivalent changes and modifications made within the technical spirit of the present invention should fall within the scope of the claims of the present invention.