CN102166794A - Rubber continuous mixing dual-rotor structure and mixing equipment adopting same - Google Patents

Abstract

The feeding section of a pair of composite rotors with a double-rotor structure for rubber continuous mixing is a large-lead thread structure, the kneading section adopts a toothed disc structure, and the mixing section is a shearing rotor mixing element and an meshing rotor mixing element. Components, large lead rotor mixing components. The double-rotor structure of the present invention is installed in the barrel of the mixing equipment, and the control system is connected with the cooling system, the power transmission system and the feeding mechanism. The composite rotor structure can realize continuous, efficient and high-quality mixing of rubber. The mixing equipment is capable of continuous, high-efficiency and high-quality mixing. It is used in conjunction with the block rubber continuous plasticating equipment to realize the continuous mixing of block rubber.

Description

Double-rotor structure for rubber continuous mixing and mixing equipment adopting this structure

technical field

The invention relates to rubber processing and molding equipment, in particular to a double-rotor structure for continuous, high-efficiency and high-quality mixing of rubber and the mixing equipment adopting the structure.

Background technique

The mixing process is the most critical and the most energy-intensive link in rubber processing. The quality of the mixed rubber ultimately determines the quality and service life of the finished product. Therefore, the research and improvement of the mixing link is always the domestic The focus of foreign rubber processing industry.

At present, the mixing equipment used in the rubber industry is mainly open mills and internal mixers. They are all batch mixing equipment, the production process is discontinuous, and the difference in each operation condition will cause the disadvantages of unstable mixing quality. Therefore, to realize efficient and high-quality continuous mixing production of rubber has been the dream of technicians in the rubber processing industry for decades, and the rotor structure, which is the core of mixing equipment, is the focus of research and development.

The so-called continuous mixing refers to the use of a continuous mixer to continuously feed raw rubber or plasticized rubber and compounding agents according to the set ratio and perform continuous mixing, and the mixed rubber can be continuously discharged from the rubber discharge port. Continuous mixing can realize feeding and unloading at the same time, greatly improving production efficiency, eliminating or simplifying the huge internal mixer, lower auxiliary machine and upper auxiliary machine, and then replaced by a linkage production line, which greatly simplifies the structure of the equipment and greatly Significantly reduce energy consumption, improve the quality and stability of compound rubber, and easily realize safe and environmentally friendly operation.

At present, many countries in the world have proposed the new theory of continuous mixing, and have also designed and produced various continuous mixing equipment. The United States, Italy, Germany, etc. have developed and produced various types of continuous mixing machines, but these continuous mixing equipment are only suitable for plastics and fluid rubber materials, that is, the rubber materials must be powder or granular, and must be combined with Carbon black is premixed in advance. In the production of modern rubber industry, since the raw material is mainly block rubber, the production mainly relies on the internal mixer to complete the mixing of rubber, and then it is compressed by a tablet press or extruded by an extruder. Therefore, continuous mixing of non-powdered and granulated rubber has not been realized in the true sense.

Chinese utility model patent, authorized announcement number CN2815670Y, "A high polymer co-mixing and forming equipment" discloses a storage room connected to the discharge port of the internal mixer, and the discharge port of the storage room is connected to the extrusion In the technical scheme of the machine, the mixing part still adopts the batch mode, but the work of the extrusion part is continuous, so it is not continuous mixing in the true sense. Chinese invention patent, publication number CN101288985A, "Continuous Mixing Extruder Rotor" is a screw for ethylene engineering mixing extrusion granulation unit in petrochemical industry, suitable for continuous processing of plastics, because its feeding section adopts meshing or semi-meshing Multi-threaded threads make feeding difficult; the mixing section is composed of forward and reverse multi-edged spirals, or the mixing section is composed of forward and reversed multi-edged spirals and mixed with unidirectional spiral mixing section, long If the diameter ratio is less than 12, there are disadvantages such as short rubber mixing time, poor mixing, shearing, and stretching effects, and it is difficult to completely and evenly disperse various ingredients in the raw rubber to make a uniform quality mixed rubber, so it cannot be used. For continuous mixing of rubber.

Contents of the invention

The present invention aims to solve the technical problem that the existing equipment cannot realize continuous rubber mixing and processing, and provides a double-rotor structure capable of realizing continuous, high-efficiency, and high-quality rubber mixing equipment and adopting this structure to carry out continuous, high-efficiency, and high-quality rubber It is used together with the block rubber continuous plasticating equipment to realize the continuous mixing equipment of block rubber.

The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a double-rotor structure for rubber continuous mixing, including a pair of composite rotors with different threads, parallel and different rotations, and the same speed. The rear end of the rotor is connected to the power transmission. system, the screw parts in a pair of composite rotors are partially meshed, and there are feeding section, kneading section, mixing section and extrusion section on the rotor; the feeding section is a large-lead thread structure; the kneading section adopts a toothed disc structure The mixing section is composed of three sections, mixing section I is a shearing rotor mixing element, mixing section II is an meshing rotor mixing element, and mixing section III is a large lead rotor mixing element.

The mixing space between the compound double rotor and the barrel is larger than that of the single-screw structure, and the mixing output is high. The dual rotors have strong conveying capacity, which enhances the fluidity of materials and avoids stagnation of materials. Parallel, opposite rotating and partially meshed rotor elements have strong shearing and dispersing effects on materials and uniform mixing. Compared with double rotating rotors rotating in the same direction, the double rotors with opposite rotating directions make the material flow better and the conveying capacity stronger. The pressure is higher, and the two rotors rotate in opposite directions, that is, the effect of inward rotation is better, and a pair of composite rotors with different threads make the mixing more complete and more uniform. The large-lead thread structure of the feeding section ensures the smooth entry of materials. The kneading section mainly plays the role of split flow and mixing. In the three-stage mixing section, the materials are pushed, sheared, extruded, dispersed, stirred and mixed, fully mixed.

The rubber continuous mixing double-rotor structure of the invention can realize continuous, high-efficiency and high-quality rubber mixing.

The feeding section is a single-head thread, and the pitch decreases from back to front; the end faces of the toothed discs on the two rotors of the kneading section face each other, leaving a gap; one end of the mixing section I has two sections of left-handed ribs with different lengths. The other end has two right-handed ribs with different lengths; mixing section II has two short spiral ribs, and there is a long spiral rib between the two short spiral ribs; mixing section III has two The screw flight is composed of two screw connections with different screw rotation directions and different helix angles; the extrusion section is a double-start thread, the pitch of the latter part decreases from back to front, and the pitch of the former part is equal. The feeding section whose screw pitch decreases from the back to the front also plays the role of breaking the rubber and further improving the plasticizing effect of the rubber while conveying and compacting the material. The compaction of the material mainly plays the role of discharging part of the air brought in when the material is fed. , so that the plasticized rubber and the added compounding agent are in full contact. When the material passes through the toothed disc of the kneading section of one rotor, it is divided into several strands, and the material flows out and is cut off by the toothed disc of the kneading section of the other rotor. When the shear type mixing rotor element rotates, because the working diameters of the ribs on the two rotors are different when they cooperate, a velocity gradient is formed, which causes a large flow of the material in the circumferential direction, and the material is subjected to a large force from the ribs. Thrust, reverse thrust, shearing and extrusion, the material is subjected to folding and axial reciprocation, cutting, stirring and other effects between the rotors, so that the compounding agent can be better dispersed and evenly distributed. The kneading ribs of one meshing rotor mixing element mesh into the ribs of another meshing element in turn. The outer diameter of the knuckle is different from the linear speed at which the root of the knuckle rotates. The material is between the kneading rotor mixing elements and between the rotor and the machine. The inner walls of the cylinder are subjected to constantly changing and repeated strong kneading, shearing and extrusion. The forward thread of the screw edge of the large-lead rotor mixing element pushes the material forward, and the reverse thread pushes the material backward. Under the action of positive and negative directions, the material produces longitudinal and transverse mixing, stretching and shearing, and is continuously Squeeze, shear, disperse and mix. The extrusion section extrudes the rubber compound smoothly and stably. The latter part of the extrusion section mainly plays the role of compaction and transportation, and the former part plays the role of ensuring stable extrusion and obtaining better quality rubber compound.

The thread heights of the feeding section, mixing section Ⅰ, mixing section Ⅱ, mixing section Ⅲ and extrusion section are equal, and the screw matrix is cylindrical; the head of the rotor is conical; the rotor behind the feeding section is provided with reverse glue groove. The conical rotor at the front end makes the fluidity of the compounded rubber good and ensures the stable extrusion quality. Anti-adhesive groove prevents the adhesive from overflowing from the rear of the rotor.

The feeding section, kneading section, kneading section I, kneading section II, kneading section III and screw elements of the extruding section of the rotor are detachably installed on the mandrel of the rotor, and the kneading section, kneading section I, The arrangement sequence of mixing section II and mixing section III on the rotor can be changed. This building block combination is convenient for manufacture, installation and maintenance. Changing the arrangement sequence can adapt to the requirements of different materials, processes and products.

The feeding section, mixing section Ⅰ, kneading section, conveying section Ⅰ, mixing section Ⅱ, conveying section Ⅱ, mixing section Ⅲ and extrusion section are sequentially arranged on the rotor along the advancing direction of the rubber material. This order of arrangement has the best mixing effect.

Conveying section I and conveying section II are double-start threads, and the pitch decreases from back to front. There are section I screw grooves and section II screw grooves perpendicular to the threads on the two screw edges. The screw pitch of conveying section I and conveying section II becomes smaller from the back to the front, and it also has a compacting effect while conveying materials; the conveying section I and conveying section II with grooved screw ribs enable material exchange between adjacent thread grooves, Part of the material is diverted to the adjacent screw grooves, and is continuously divided, mixed, and refluxed. The mixing quality is uniform, and the main shearing action occurs near the wall of the barrel. The heat transfer effect is good, the temperature rise of the material is small, and the operation is stable.

The feeding section thread is a triangular thread. The root of the triangular thread is thick, which improves the mechanical strength and rigidity of the feeding section.

A plasticating equipment adopting any one of the double-rotor structures in claims 1-7, including a frame for fixing the barrel, a feeding mechanism, a power transmission system, a cooling system and a control system, the rubber continuous mixing double-rotor of the present invention The rotor structure is installed in the barrel; the rear end of the rotor is connected to the power transmission system, and the feeding mechanism is above the barrel, which is connected to the feeding port on the barrel; the cooling water channel on the barrel is connected to the cooling system; the control system is connected to the cooling system, power Transmission system and feeding mechanism.

Due to the above-mentioned properties of the rubber continuous mixing double-rotor structure of the present invention, the mixing equipment of the present invention can carry out continuous, efficient and high-quality mixing of rubber, and it can be used together with the continuous plasticizing equipment of block rubber to realize block shape Continuous rubber mixing.

The barrel is a segmented barrel, and each segment of the barrel has a cooling channel. Each section of the barrel is sequentially sealed and fixedly connected together to form a whole barrel. The segmented combination of the barrel is convenient for manufacture, installation, replacement and maintenance.

The segmented barrel adopts a longitudinally split structure. The barrel with longitudinally split structure is convenient for cleaning and maintenance of the barrel and rotor, and it is convenient to disassemble the barrel to observe the mixing state and mixing degree of each section, which provides a basis for research and improvement of equipment.

The front end of the machine barrel is connected with the machine head.

The feeding mechanism includes a set of carbon black automatic weighing and feeding device composed of a storage hopper and a screw feeder for adding carbon black, a set of small storage hoppers, a stirring device hopper and a screw feeder for adding various small materials. Material automatic weighing and feeding device, a set of film supply device imported from plasticizing equipment to extrude film; carbon black feeding device, small material feeding device and film feeding device are connected to the feeding port on the barrel. Under the control of the control system, the feeding mechanism can continuously and quantitatively add rubber materials, carbon black, small materials and other compounding agents into the mixing equipment according to a certain ratio.

The advantages of the present invention are: the feeding section, the kneading section, the mixing section and the extruding section of the composite rotor structure composed of a pair of counter-threaded, partially meshed, parallel and counter-rotating rotors of the present invention can realize continuous and high-efficiency rubber , High-quality mixing. The mixing equipment adopting the double rotor structure of the present invention is under the control of the control system, and the rubber material, carbon black, small materials and other compounding agents are continuously quantitatively added to the mixing equipment according to a certain proportion, and the mixing rubber is continuously extruded from the machine head to carry out continuous , High-efficiency and high-quality mixing, used together with block rubber continuous plasticating equipment, can realize block rubber continuous mixing.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of the double rotor structure of the present invention;

Fig. 2 is the structural representation of an embodiment of the mixing equipment adopting Fig. 1 composite double rotor;

Fig. 3 is a schematic structural view of the barrel part of the mixing equipment in Fig. 2 .

Detailed ways

Description with reference to the accompanying drawings.

The double-rotor structure in Fig. 1 is a pair of composite rotors 2 with different threads, parallel, different rotations and the same rotational speed, and the threaded parts are partially engaged. The rear end of the rotor is connected to the power transmission system, see Figure 2. Rotor 2 from the rear to the front: feeding section 29, mixing section I28, kneading section 27, conveying section I26, mixing section II25, conveying section II24, mixing section III23 and extrusion section 22 are set on the core of rotor 2 On the shaft, the combination of building blocks is convenient for manufacture, installation and maintenance. The head 21 of the conical rotor is fixedly mounted on the front end of the mandrel, and the mandrel behind the feeding section 29 is provided with a reverse glue groove 210 to prevent the glue from overflowing. The feeding section 29 is a large-lead single-start triangular thread structure whose pitch gradually decreases from back to front. The mixing section I28 is a shear-type rotor mixing element, one end of which is a left-handed rib, and the other end is a right-handed rib. In this embodiment, the front end of the shear-type rotor mixing element has two sections of left-handed ribs with different lengths. There are two right-handed ridges of different lengths at the rear end. The kneading section 27 adopts a toothed disk structure, and the end faces of the toothed disks on the two rotors 2 of the kneading section 27 are opposite to each other, leaving a gap. The mixing section II 25 is an intermeshing rotor mixing element with long helical ridges and short helical ridges. In this embodiment, there is a long helical ridge between the two short helical ridges. spiral ridges. The mixing section III23 is a large-lead rotor mixing element, the upper flight of which is composed of two screw connections with different rotation directions and different helix angles. In this embodiment, there are two screw flights on the large-lead rotor mixing element. The extruding section 22 is a double-start thread, the pitch of the rear part of the extruding section 22 gradually decreases from the back to the front, and the pitch of the former part is equal. The conveying section I26 and the conveying section II24 are double-start threads, the pitch of which decreases gradually from the back to the front, and there are section I screw grooves 261 and section II screw grooves 241 perpendicular to the threads on the two screw edges. The thread heights of feeding section 29, mixing section I28, mixing section II25, mixing section III23, conveying section I26, conveying section II24 and extrusion section 22 are equal, and the screw matrix is cylindrical.

The rubber continuous mixing double-rotor structure of the invention can realize continuous, high-efficiency and high-quality rubber mixing.

Fig. 2 is a structural schematic diagram of a mixing equipment adopting the embodiment of the double-rotor structure in Fig. 1 . The barrel 3 of this embodiment of the device surrounds the compound double rotor 2 . The motor 63 transmits the power to the distributor 61 through the reducer 62, and the rear end of the composite double rotor 2 is connected to the output shaft of the distributor 61, and the distributor 61 drives a pair of counter-threaded, partially meshed, parallel rotors 2 with different directions and constant speeds rotate. The motor 63 , speed reducer 62 and distributor 61 of the power transmission system are fixed on the frame 7 . The front end of the machine barrel 3 is fixedly connected to the machine head 1, and the rear end is fixedly connected to the housing of the distributor 61. The front and middle parts of the machine barrel 3 are supported by a machine barrel support fixed on the frame 7.

The feeding mechanism consists of three parts: a film supply device 5 for extruding film from a plastic mixer, an automatic carbon black weighing and feeding device composed of a storage hopper and a screw feeder for adding carbon black, and a device for adding various small materials The small material automatic weighing and feeding device composed of storage hopper, stirring device hopper and screw feeder, carbon black and small material feeding device 4 in Figure 2 represents two parts: carbon black automatic weighing and feeding device and small material automatic weighing and feeding device . The feeding mechanism is above the machine barrel 3, and the three parts of the feeding mechanism communicate with the same feeding port 341 on the machine barrel 3. The barrel 3 has a cooling water channel 311 connected to the cooling system, see FIG. 3 . The control system connects the cooling system, power transmission system and feeding mechanism. Under the control of the control system, the feeding mechanism can quantitatively add rubber materials, carbon black, small materials and other compounding agents into the mixing equipment according to a certain ratio.

Figure 3 is a schematic diagram of the barrel part of the mixing equipment in Figure 2 . Barrel 3 is a segmented combined connection structure, and each section is sequentially sealed and fixedly connected together to form an integral barrel 3. Barrel 3 is composed of a barrel 34 in the feeding section, a barrel 33 in the mixing section I and a kneading section, and a barrel 33 in the mixing section. The refining section II barrel 32, the mixing section III and the extrusion section barrel 31 are composed of four sections. Section II25 to conveying section II24, and mixing section III23 to extrusion section 22 correspond. The 3-section combination of the barrel is convenient for manufacture, installation, replacement and maintenance. Cooling water channel 311 is arranged on each section machine barrel, and cooling water enters cooling water channel 311 from cooling water channel inlet 331, flows out from cooling water channel outlet 332, and machine barrel 3 is cooled. The segmented barrel of this embodiment adopts a split structure that is divided into two pieces in the longitudinal direction. The split structure is convenient for cleaning and maintenance of the barrel 3 and the rotor 2, and it is convenient to disassemble the barrel 3 to observe the mixing state of each section. And the degree of mixing provides a basis for research and improvement of equipment. The split structure of the segmented barrel is not shown in the figure.

The mixing equipment of the present invention can carry out continuous, high-efficiency and high-quality mixing of rubber, and can be used together with the block rubber continuous plasticating equipment to realize the continuous mixing of block rubber.

Claims (10)

1. rubber continuous mixing dual-rotor structure, comprise a pair of incorgruous screw thread, parallel, the incorgruous rotation compound rotor (2) identical with rotating speed, the rotor rear end connects power drive system, it is characterized in that the threaded portion in a pair of compound rotor (2) is the part engagement, feeding section (29), kneading section (27), mixing section and extruding zone (22) are arranged on the rotor (2); Feeding section (29) is the steep-lead thread structure; Kneading section (27) adopts the toothed disc structure; Mixing section is formed by three sections, and mixing section I (28) is the shearing rotor mixing elements, and mixing section II (25) is the meshing rotor mixing elements, and mixing section III (23) is big helical pitch rotor mixing elements.

2. rubber continuous mixing dual-rotor structure according to claim 1 is characterized in that feeding section (29) is an one start screw, pitch by after reduce forward; Toothed disc end face on two roots rotors of kneading section (27) is relative, leaves the gap; One end of mixing section I (28) has the different left-handed lug, nib of two segment length, and the other end has the different dextrorotation lug, nib of two segment length; Mixing section II (25) has the spiral lug, nib of two weak points, and a long spiral lug, nib is arranged between the spiral lug, nib of two weak points; Two spiral shell ribs are arranged on the mixing section III (23), the spiral shell rib by screw thread rotation direction difference, helical angle is different two sections be threaded and form; Extruding zone (22) is a double thread, its latter part of pitch by after reduce forward, preceding a part of pitch equates.

3. rubber continuous mixing dual-rotor structure according to claim 1 and 2 is characterized in that the thread depth of feeding section (29), mixing section I (28), mixing section II (25), mixing section III (23) and extruding zone (22) equates that the screw thread parent is cylindric; It is conical that the head of rotor (21) is; Have anti-glue groove (210) on the rotor (2) of feeding section (29) back.

4. rubber continuous mixing dual-rotor structure according to claim 1 and 2, it is characterized in that kneading section (27), mixing section I (28), mixing section II (25) and the distributing order of mixing section III (23) on rotor (2) can change on the dismountable mandrel that is installed in rotor (2) of the screwing element of feeding section (29), kneading section (27), mixing section I (28), mixing section II (25), mixing section III (23) and extruding zone (22) of rotor.

5. rubber continuous mixing dual-rotor structure according to claim 1 is characterized in that rotor (2) upper edge sizing material direction of advance arrange successively feeding section (29), mixing section I (28), kneading section (27), transportation section I (26), mixing section II (25), transportation section II (24), mixing section III (23) and extruding zone (22).

6. rubber continuous mixing dual-rotor structure according to claim 5, it is characterized in that transportation section I (26) and transportation section II (24) are double threads, pitch by after reduce gradually forward, have on both spiral shell ribs perpendicular to the section I screw channel (261) of screw thread and section II screw channel (241).

7. mixing facilities that adopts any one continuous mixing dual-rotor structure among the claim 1-6, comprise the fixedly frame (7) of machine barrel (3), and charging mechanism, power drive system, cooling system and control system, it is characterized in that the continuous mixing dual-rotor structure is installed in the machine barrel (3); The rotor rear end connects power drive system, and charging mechanism is communicated with the spout (341) on the machine barrel (3) in the top of machine barrel (3); Cooling water channel (311) on the machine barrel (3) connects cooling system; Control system connects cooling system, the PWTN charging mechanism of unifying.

8. the mixing facilities of employing continuous mixing dual-rotor structure according to claim 7 is characterized in that machine barrel (3) is the machine barrel of segmentation combination, has cooling water channel (311) on every section machine barrel.

9. the mixing facilities of employing continuous mixing dual-rotor structure according to claim 8 is characterized in that the machine barrel of segmentation combination adopts vertical split type structure.

10. the mixing facilities of employing continuous mixing dual-rotor structure according to claim 7, it is characterized in that charging mechanism comprises that a cover is used for adding the automatic weighing feeding device of being made up of storage hopper and screw feeder of carbon black of carbon black, one cover is used for adding the automatic weighing feeding device of being made up of storage hopper, agitating device hopper and screw feeder of small powder of various small powders, and a cover introduction plasticator is extruded the film feeder (5) of film; Carbon black feeding device, small powder feeding device and film feeder (5) are communicated with the spout (341) on the machine barrel (3).

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