CN202146733U - Three-rotor continuous mixing machine set provided with triangularly-arranged rotors - Google Patents

Abstract

The three-rotor continuous mixing unit with triangular arrangement of rotors in the utility model is mainly composed of a mixing part and a discharging part, and can adopt a single-stage or double-stage form. The mixing part is mainly composed of feeding device, barrel, rotor, heating and cooling device and transmission device. There are three mixing rotors, and the centerlines of the three rotors are arranged in a triangle; the mixing rotor must have a feeding section and a mixing section, the feeding section adopts a screw conveying structure, and the mixing section rotor adopts a cam shape, an S shape, or a square shape, etc. Efficient mixing rotor structure. When the single-stage form is adopted, the end of the rotor adopts a spiral structure to build pressure to convey the material to the machine head; when the two-stage form is adopted, the compounded material enters the next-stage screw extruder through the valve to establish pressure to convey the material to the machine head. Both forms use the head suitable for the cavity for granulation or molding. In order to further increase the pressure, a melt pump can also be connected to the head. The three rotors can be at the same speed or at different speeds, and multiple shearing, stretching and kneading zones are formed during operation, and the exchange of materials between the rotors is more frequent, which effectively improves the plasticizing, melting and dispersing performance of the equipment, and shortens the processing time. time, increased production. The mixing unit can be used in the process of mixing and granulating in the processing of rubber, paint, propellant, explosive, pulp, plastic, food, pharmaceutical, feed, etc.

Description

Three-rotor continuous mixing unit with triangular arrangement of rotors

technical field

The invention relates to a three-rotor continuous mixing unit with triangular arrangement of rotors, which can be used for mixing and granulation in the processing of rubber, paint, propellant, explosive, paper pulp, plastic, food, pharmacy, feed and the like. the

Background technique

Mixing is a key process link that determines the performance of polymer products, especially for high viscoelastic materials such as rubber. The uniformity and stability of material mixing is the key to ensure the quality of polymer products. The realization of uniform mixing mainly depends on mixing technical equipment, including open mixer, internal mixer, double-rotor continuous mixer and screw extruder. Industrially, screw extruders are mainly used for plasticizing plastics, food and thermoplastic elastomers, while the other three are mainly used for mixing complex materials such as rubber, coatings, explosives and propellants. Open mills and internal mixers are batch mixing equipment, which are not only inefficient, but also difficult to achieve the same mixing quality of different batches of materials. the

The double-rotor continuous mixer combines the excellent mixing characteristics of the internal mixer, and also operates continuously, and is widely used in industrial mass production. It is mainly composed of barrel, rotor, unloading device and other parts. The mixing chamber on the barrel is two interconnected holes with a circular cross section, and the materials are sheared, pulverized, kneaded and mixed by the rotor in the mixing chamber. The non-meshing counter-rotating rotor is mainly composed of feeding section, mixing section and discharging section. The feeding section of the rotor is like two non-meshing twin-screws. Driven by the threads of the feeding section of the rotor, the material fed from the feeding port reaches the mixing section. The helix angles on the surface of the mixing section of the rotor are different and the threads are staggered, where the materials are melted, mixed and plasticized. The unloading device can control the opening of the unloading door to achieve the purpose of controlling the residence time of materials in the mixing chamber. the

Patent CN01207223.0 developed a triangular parallel three-screw extruder on the basis of a parallel twin-screw extruder. Three screws are arranged in parallel to form three kneading zones and a central zone. Compared with the twin-screw extruder, the three-screw extruder has the characteristics of friction shear and positive displacement conveying of multiple meshing zones, and the material has a larger contact area with the screw. Good mixing, good heat transfer, high melting capacity, excellent exhaust ability and better temperature control, and has lower energy consumption. the

Similarly, on the basis of the double-rotor mixer, three rotors are used to form a new mixer, which will not only increase the output and save energy, but also significantly improve the mixing effect. the

Contents of the invention

Different from the traditional double-rotor kneader, the continuous kneader of the present invention adopts a three-rotor kneading structure in which the rotors are arranged in a triangle, as shown in Fig. 1 . The mixing part is mainly composed of feeding device, barrel, rotor, heating and cooling device and transmission device. There are three rotors in the mixing part, and the center lines of the three rotors are arranged in a triangle, which is equivalent to three pairs of double rotors for mixing. Further, for continuous mixing, the mixed material must be transported to the machine head for granulation or molding, that is, a discharge part is required in addition to the mixing part. In this way, the three-rotor continuous mixing unit consists of a mixing part and a discharging part. The complete unit formed for this purpose can be either single-stage or double-stage. the

The single-stage three-rotor continuous mixer is that the rotor is composed of a non-meshing screw feeding section, a mixing rotor section and a screw discharging section in turn. The feeding section adopts a screw conveying structure, and the materials are continuously added and mixed and are forced to be discharged through the conveying section. The machine head performs granulation or molding, and the cavity structure of the machine head depends on the shape of the exported product. In order to increase the outlet discharge pressure, a gear pump can also be connected in front of the machine head. the

The two-stage three-rotor continuous mixing unit is shown in Figure 1, which mainly consists of a mixing part and a discharging part. In the first stage, the non-intermeshing screw feeding section and the mixing rotor section are manufactured as a whole, and the materials are continuously fed and mixed, and discharged to the second stage through the discharge valve with adjustable opening at the end. The opening of the valve controls the discharge rate and creates a second-order fullness, builds up pressure, and changes the mixing intensity in the mixing section. The second stage can be a screw extruder, which adopts a screw structure suitable for adding molten materials, and is transported to the head by the screw for granulation or molding. The cavity structure of the head depends on the shape of the exported product. In order to increase the outlet discharge pressure, a gear pump can also be connected in front of the machine head. the

The rotor mixing section of the present invention can adopt various high-efficiency mixing rotor structures such as cam-shaped, S-shaped or square rotors. When the three-rotor kneader is running, the material is added to the feeding port, and is conveyed to the kneading rotor section by the screw for repeated mixing and masticating. Since there are three rotors, the strong stretching zone and kneading zone between the rotors are multiplied, so the mixing effect and output can be significantly improved, and it has the effect of energy saving and emission reduction. the

Description of drawings

Figure 1 is a schematic diagram of the structure of a three-rotor continuous mixing unit with triangular arrangement of rotors.

1-motor, 2-reduction and distribution box, 3-barrel, 4-feeding device, 5-heating device, 6-rotor, 7-rotor cooling device, 8-motor, 9-reduction box, 10-barrel, 11-heating device, 12-screw, 13-machine head, 14-discharging valve, 15-connecting cylinder. the

Figure 2 is a cross-sectional schematic diagram of a cam shape in the rotor mixing section

Figure 3 is a cross-sectional schematic diagram of an S-shaped rotor used in the rotor mixing section

Figure 4 is a cross-sectional schematic diagram of a quadrilateral rotor used in the rotor mixing section

Detailed ways

This implementation case is a two-stage three-rotor continuous mixing unit. the

The three-rotor continuous mixing unit with rotors arranged in a triangle can be composed of a three-rotor continuous mixer connected with a screw extruder, as shown in Figure 1. The mixing part mainly includes: motor 1, deceleration and distribution box 2, barrel 3, feeding device 4, heating device 5, rotor 6, and rotor cooling device 7. The screw extrusion part includes: a motor 8, a reduction box 9, a barrel 10, a heating device 11, a screw 12, and a nose die 13. The mixing part and the screw extruding part are connected by a cylinder 15, in which a discharge valve 14 with an adjustable opening is provided. Motor 1, deceleration and distribution box 2 form the transmission device of the equipment. the

The working principle of the continuous mixing unit is: the motor 1 drives the input shaft of the reduction box to rotate, and the torque and speed distribution in the reduction box 2 drives the three rotors 6 to rotate through the three output shafts. The three rotors 6 rely on the end cooling system to regulate the internal temperature. The rotor has a non-meshing screw conveying section and a rotor-type mixing section, and is installed in the barrel 3, and the barrel adjusts the external temperature under the action of the heating device 5 . The material is fed into the barrel 3 through the feeding device 4, and conveyed to the mixing rotor section through the screw. The material is plasticized and mixed depending on the heat introduced from the barrel, the shearing, stretching and extrusion kneading of the rotor. The fully mixed material enters the screw extrusion part through the discharge valve 14 and the connecting cylinder 15, and is extruded through the head 13 under the action of the screw conveying to granulate or shape. In order to further increase the pressure, a melt pump can also be connected in front of the machine head. the

The three rotor mixing sections are non-meshing, so they can be at the same speed or differential speed, and the rotation directions of the three rotors can be combined in different ways. For this reason, an integrated reduction and distribution box can be used, or a separate reduction box and distribution box can be used to realize the combination of rotor motion. The mixing rotor section can make full use of various typical mixing rotor structures, such as the cam shape in Figure 2, the S shape in Figure 3 or the square rotor type in Figure 4, etc. the

Since there are three rotors, the strong stretching zone, strong shearing zone and strong extrusion zone between the rotors are multiplied, and the exchange of materials between the rotors is more frequent, so that the plasticizing, homogenizing and shearing times of the materials in the screw rod become Doubling, effectively improving the plasticizing, melting and dispersing performance of the equipment, shortening the processing time, and having the characteristics of energy saving and emission reduction. the

Claims (2)

1. The three-rotor continuous mixing unit with triangular arrangement of rotors is mainly composed of a mixing part and a discharge part, which can be in a single-stage or double-stage form; the mixing part is mainly composed of a feeding device, a barrel, a rotor, a heating and cooling device and a transmission device, and is characterized in that: there are three mixing rotors, and the centerlines of the three rotors are arranged in a triangle. 2. The three-rotor continuous mixing unit with triangular arrangement of rotors according to claim 1, characterized in that: the mixing rotor has a feeding section and a mixing section, the feeding section adopts a screw conveying structure, and the mixing rotor section adopts a cam shape , S-shaped or square rotor type high-efficiency mixing rotor structure. the

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