WO2014202036A1

WO2014202036A1 - Continuous rubber mixer

Info

Publication number: WO2014202036A1
Application number: PCT/DE2013/100413
Authority: WO
Inventors: Kangmin Duan
Original assignee: Keimei Plastifizierung Technik Gmbh
Priority date: 2013-06-18
Filing date: 2013-12-06
Publication date: 2014-12-24
Also published as: DE102013106337A1

Abstract

Continuous rubber mixer which comprises a torque drive device (1), a mixer compartment (2), rotors (3), worm shafts (4), a vent opening (5), an inlet opening (6), cooling water ducts (7), an ejection nozzle (8), a shaft coupling (9a), shaft sleeves (9b) and an electric motor (10). A specific design of the surface of the interior walls of the mixer compartment (2) and of the surface of the rotors (3) not only results in high shear force like in conventional rolling mills and internal mixers, but at the same time increases processing efficiency, stabilizes the quality of the products and improves the operating environment.

Description

DESCRIPTION

CONTINUOUS COMBUSTION MIXER The present invention relates to the industrial field of rubber processing.

State of the art

The rubber processing is basically a method to solve the conflict between the moldability and the elasticity of the rubber. The basic and decisive factor is the first process step, in which elastic raw rubber is converted to formable plastic rubber. Plastic rubber is then processed by vulcanization to rubber, the high elasticity and better

physico-mechanistic property.

In this first processing step, currently mainly rolling mill,

Internal mixer and screw extruder used. Rolling mill uses two heated rolls. They rotate at differential speeds in one direction, thereby producing shear for processing the rubber. Internal mixer works with the use of a closed mixing chamber in which two rotors in the same

Turn direction. This creates a strong shearing force on the raw rubber to be processed between the rotors and the inner wall of the mixing chamber. Existing screw extruders are mainly single-screw extruders,

Double-screw extruders and multi-screw extruders, however, whose shear force and torque transmission are not sufficient for rubber compounding. They are most used in molding. For example, the twin-screw extruder from Mannesmann Plastics Machinery GmbH (MPM Group) is suitable for compression molding of adhesive tape or renewed tires. Here already plasticized rubber is used as material. Since the shear force of such twin-screw extruder the Call for mixing raw rubber far from being achieved, he is in the

Initial phase of rubber processing not comparable with rolling mill or internal mixer.

The patent US7080935B2 is a multi-screw extruder whose

Plastication result in mixing of different polymers or of polymers and elastomers very well. However, its shear is not enough to mix raw rubber. The result is not comparable with rolling mill or internal mixer. The lack of sufficient shear force also applies to single screw extruders, such as e.g. The subject of the patent EP2425957A1 and DE3107214A1. Since the shearing force produced here does not reach the mixing of raw rubber, it is not comparable with rolling mill or internal mixer.

Therefore, rolling mills and internal mixers are preferred in processing raw rubber. However, as continuous production is not possible with them, it points to significant disadvantages in stabilizing production quality and improving the working environment. The present invention is based on this background the object, a

To invent rubber mixer, on the one hand has sufficient shear force such as rolling mill and internal mixer and on the other hand can work continuously. This object is achieved according to the invention in that such a high shear force is produced due to the design of the pattern of the inner wall surface of the mixing chamber 2 and the surface of the rotors 3.

Description of the invention

The present invention is thereby realized: a

High-torque drive device 1 transmits the driving force to a

Rubber mixing plant, which has a mixing chamber 2, rotors 3, screw shafts 4, Vent opening 5, inlet opening 6, cooling water channels 7, outlet nozzle 8,

Shaft coupling 9a, shaft sleeves 9b and electric motor 10 has. The mixture of crude rubbers, fillers, etc., is continuously introduced through inlet 6, mixed in mixing chamber 2 and finally after

Plastification pressed out through the discharge nozzle 8. In the mixing chamber 2 floatingly mounted on each other are the three rotors 3, which at one end with input shafts of the high-torque drive device 2 by

Shaft sleeves 9b are connected. The rotors 3 rotate in the same direction to thereby produce a maximum relative speed difference between them, the relative speed difference between them and the inner wall of the mixing space 2 being comparatively less. Out of these two

Relative-speed differences produce high shear on the mix.

Each of the three rotors 3 is assembled in sections with different rotor components. The worm shafts 4 secure the rotor component

Involute splines 29 and thereby also transmit the driving force. Depending on the production goals, the different rotor components can be freely combined. Surface of the rotor component can be designed with different patterns to increase the shearing force on rubber. The cross section of the mixing chamber 2 has a cloverleaf shape as in FIG. 4. The

Mixing space 2 is characterized in that its inner wall with grooves 31 or other patterns such as waves or pits is to make. When the mixed mass flows between the inner wall of the mixing chamber 2 and the rotors 3, an increased resistance, a maximum relative movement of the mixed mass and a high shear force will result.

On the mixing chamber 2 vent 5 is provided to vent water vapor, low molecular weight substances and so on and thereby unpleasant odor to reduce the rubber processing.

90

In a single pass, raw rubbers, fillers, etc. are fed as mixing compound through the inlet port 6. They are within the mixing chamber 2 with high

Shear power mixed. The shearing process is located within the mixing chamber 2 on all surfaces with relative movements, including the inner wall of the mixing chamber 2 and 95 the rotors 3. During rotation, the rotors 3 shear thereby very effectively the mixed mass. The reaction force of this high shear force is distributed in the axial and radial directions, whereas in the rolling mill and internal mixer it is distributed only in the radial direction

Direction lies. The mixed mass is sufficiently mixed throughout the process. As it passes the vent 5, volatiles such as

100 low-molecular substances and water vapor automatically. In order to improve the ventilation even further, the vent opening 5 with a vacuum pump in addition

be connected. The ready-mixed compound is finally through

Outlet nozzle 8 pressed out. The nozzle is to be designed in flat or other shape as needed.

105

Special feature of the rolling mill and internal mixer is their high shear. The present invention also provides a comparable high shear. In contrast to rolling mill and internal mixer here is a highly effective shearing process during the entire rotation of the rotors 3 before. The shearing force of the rolling mill arises only in the

110 contact point of the rolling rolls. In internal mixers, it arises mainly between the

Rotors and the inner wall. When the two rotors come closer, one becomes

Shear force generated only in seconds. Therefore, it is not difficult to say that the present invention has high rolling mill and internal mixer efficiency.

The high-torque drive device 1 is characterized in that each gear receives only half the load of its subordinate gears. It is realized according to Fig. 2 in the following construction: The input shaft 11 transmits driving force to the Reduzierzahnrad 12, which drives the gears 14 and 16 continues. The Gears 12, 14 and 16 sit on a same shaft, which itself serves as an output shaft for 120 transmission of the driving force. The gear 14 further drives the gear 20 through the gear 13. The gear 16 drives through the gears 15 and 17 then further the gear 19 and the gear 22. The gears 20 and 22 drive together the output shaft 21. The gears 20 and 19 Together, drive the output shaft 18. Thereby, each output gear is driven by two drive gears. Because the 125 two drive gears are distributed in the direction of the diameter of the output gear, the transmission arm remains maximum long and thus the maximum torque torque. At the same time, the load on each tooth is halved so that its life is extended accordingly. The output shafts 21, 18 and 12 can absorb the large axial force from the mixing chamber 2.

130

The mixing space 2 is characterized in that the inner wall surface can be designed smoothly or with grooves 31 depending on the mixing processes. The smooth surface is particularly suitable for the second half of the mixing process. The goal of this phase is more transfer than shearing of the mixed mass. The already sheared mixed mass

135 is thereby conveyed from the mixing chamber 2. The provided with grooves 31

Inner wall surface is, in contrast to smooth surface, sufficient resistance to produce when the mixed mass flows between it and the rotors 3. This surface with grooves 31 is used in the first half of the mixing process, so that elastic raw rubber cracked and smoothed and then with

140 fillers and other additives can be mixed. The grooves 31 are normally designed in a striped pattern. Depending on the materials to be processed and the shear force required, they can also be designed in wave or dimple patterns. The deeper the grooves 31, the greater the resistance, the greater the shear force.

145

The mixing space 2 is further characterized in that it is assembled from several sections. In each section cooling water channels 7 are shown leading to the common cooling water inlet opening 33 and -auslassöffnung 34 and thereby connected with external control system of the water supply to control the 150 temperature of the mixing chamber 2 in sections.

The mixing chamber 2 is also characterized by that for the inner layer

Carbide bushing 32 is used to increase the life of the mixing chamber 2.

The rotors 3 are characterized in that they consist of several components.

The rotor components can be made according to numerous patterns. They will fasten by involute splines 29 on worm shafts 4, which transmit driving force from the high-torque drive device 1. Depending on the needs of the

Mixing rotor components can be freely selected and combined.

160 However, similar components are used to form a portion of the rotors 3. Usable are e.g. Smooth pattern rotor component 23,

Groove pattern rotor component 24, sawtooth rotor engine component 25,

Internal mixer rotor component 26, shear rotor component 27 as well

Damping rotor component 28. Designing a new rotor component varies according to

165 substances and production needs possible.

The rotors 3 are characterized by having groove pattern rotor components 24 which correspond to the grooves 31 of the inner wall surface of the mixing space 2 in order to produce strong shearing force on the mixing mass. While the shear force at

170 rolling mill and internal mixer remains only in the radial direction, it is here by the

Rotors 3 divided in the radial and axial directions. This can on the one hand the

Through diameter in the radial direction can be reduced. On the other hand, the shearing force of the axial direction can be supported by the sufficient additional space. The total shear force remains as strong as in the rolling mill and internal mixer. That is the core advantage of

175 present invention.

The rotors 3 are further characterized in that their

Groove pattern rotor component 24 have a surface which, as needed with grooves ι

30 or dimple can be made by generating sufficient shearing force in the rotation to roll rubber.

The rotors 3 are characterized in that they have damping rotor component 28. The rotors 3 are also characterized in that they have smooth-surfaced rotor component 23 for the second half of the mixing process, in order to be able to convey the mixed mass further and finally to be pressed out with the use of the discharge nozzle 8 in the desired shape. embodiment

An embodiment of the present invention preferably has the following settings: The diameter of the rotors 3 is 53 mm in each case. Throughput of the corresponding

Mixing chamber 2 is 53.5 mm each. The length-to-pass ratio is 30: 1. Each section of the mixing chamber 2 is 200 mm long, so that a mixing chamber 2 of eight

Is to build sections together.

According to Fig. 1, the embodiment preferred a 90 KW electronic motor 10, a shaft coupling 9a with safety bolts, a

High-torque drive device 1, whose housing is made of iron. The toothed surface grinding hard surface gears in the

High-torque drive device 1 are to be built together according to FIG. Three output shafts of the high-torque drive device 1 complete

Shaft sleeves 9b with the three rotors 3 in the mixing chamber 2 at. An input shaft connects to the electronic motor 10 through shaft coupling 9 a. The mixing chamber 2 is built from eight sections as shown in Fig. 4, wherein each section is provided in the interior with cooling water channels 7 and on the outside with radiator, so that the temperature of the mixing chamber 2 can be controlled during the mixing process. The rotors 3 consist in order of components 25, 24, 26, 27, 28, 23, wherein in each case

210 similar components are used to form a portion of the rotors.

The components are tied by worm shafts 4, fastened and thereby connected to the high-torque drive device 2. The vent 5 is preferably used at the last section of the mixing chamber 2 nearer exit. By contrast, the inlet opening 6 is preferably to be inserted at the first section of the mixing chamber 2.

215 The cooling water channels 7 are through cooling water inlet 33 and outlet 34 with a

Cooling water cycle connected. The exhaust nozzle 8 is preferably to be designed in a flat shape of 5mm * 200mm.

After assembly, consisting of raw rubbers, fillers, etc. existing

220 mixed mass is introduced in the inlet opening 6 flowing, in the mixing chamber. 2

mixed continuously. After plasticizing, plastic rubber will be used

continuously pressed through exhaust nozzle 8. The worm shafts 4, on which the rotor components are mounted and fixed, connect to the

High-torque drive device 1, the transmission is constructed as shown in Fig. 2. The

225 input shaft 11 transmits driving force to the Reduzierzahnrad 12, which drives the gears 14 and 16 on. The gears 12, 14 and 16 sit on a same shaft, which itself serves as an output shaft for transmission of the driving force. The gear 14 further drives the gear 20 by gear 13. The gear 16 drives through the gears 15 and 17 then further the gear 19 and the gear 22. The gears 20 and 22nd

230 drive together the output shaft 21. The gears 20 and 19 drive together the output shaft 18. Thereby, each output gear is driven by two drive gears. Because two drive gears are distributed in the direction of the diameter of an output gear, the transmission arm remains maximum length and thereby also the maximum torque momentum. At the same time, the burden of each tooth

235 halves, so its life is extended accordingly. The output shafts 21, 18 and 12 can accommodate the large load of the axial direction from the mixing space 2. Although the present invention has been described with reference to the preferred embodiment in accordance with the accompanying drawings and although the illustrated preferred embodiment has been described in detail, the present invention is not limited to the details given herein. The spirit of the invention encompasses all changes, modifications, and equivalents as would occur to those skilled in the art.

LIST OF REFERENCE NUMBERS

Fig. 1 A continuous rubber mixer according to the invention

Fig. 2 Construction of the transmission of the high torque drive device. 1

Fig. 3 rotor components

4 shows a section of the mixing space 2

1 high-torque drive device

2 mixing room

3 rotors

4 screw shafts

5 vent

6 inlet opening

7 cooling water channels

8 exhaust nozzle

9a shaft coupling

9b shaft sleeves

10 Electric motor

11- -22 gears

23 Smooth Pattern Rotor Component

24 groove pattern rotor component

25 sawtooth rotor component 26 internal mixer rotor component

27 shear rotor component

28 damping rotor component

29 involute splines

30 surface grooves of the rotor components

31 Innenwandnuten the Michgehäuses

32 carbide bush

33 cooling water inlet opening

34 cooling water outlet opening

Claims

A continuous rubber mixer

A continuous rubber mixer, the one

High-torque drive device (1), a mixing chamber (2), rotors (3), screw shafts (4), a vent opening (5), an inlet opening (6),

Cooling water channels (7), a discharge nozzle (8), a shaft coupling (9a),

Shaft sleeves (9b) and an electric motor (10), wherein the

Cross section of the mixing chamber (2) has a shape of a cloverleaf,

characterized,

that the inner wall surface of the mixing chamber (2) and the surface of the rotors (3) are formed with groove or dimple pattern; the rotors (3) a

Have three-edge spiral structure, so that each time the rotors (3), the mixed mass can be sheared three times; the

High-torque drive device (1) can transmit high torsional force.

Rubber mixer according to claim 1,

characterized,

in that three rotors (3) are provided in the mixing chamber (2), which at one end connect to the high-torque drive device (1) through shaft sleeves (9b) and float at another end in the mixing chamber (2).

Rubber mixer according to claim 1 or 2,

characterized,

the rotors (3) consist of freely combinable rotor components and worm shafts (4), the rotor components being fastened to each other by screws and involute splines (29) to the piercing ones

Interlock worm shafts (4) which transmit the driving force.

4. rubber mixer according to claim 1 or 2,

characterized,

that surface of the rotors (3) can be designed with different Nutenmustern to increase the shear force on mixed mass.

5. rubber mixer according to claim 1,

characterized,

that the on the mixing chamber (2) attached to the vent opening (5) is to determine its position by changing the position of the belonging housing Ab section free.

6. rubber mixer according to claim 1,

characterized,

in that the high-torque drive device (1) has a gearbox in which the input shaft (11) meshes with the reduction gearwheel (12), the gearwheel (12) with the gearwheels (14) and (16) sits on a same output shaft, the toothed wheel (14) meshes with the toothed wheel (13) and jointly drives the toothed wheel (20), gears the toothed wheel (16) with the toothed wheels (15) and (17) and jointly drives the toothed wheels (19) and (22), the gears (20) and (22) intermesh with the Ausganswelle (21), the gears (20) and (19) intermesh with the output shaft (18).