KR830002006B1 - 2-axis continuous kneader - Google Patents

Abstract

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Description

2-axis continuous kneader

1 is a longitudinal sectional view of a two-axis continuous kneader according to the present invention.

2 is an enlarged cross-sectional view taken along line II-II of FIG.

3 is an enlarged sectional view taken along line III-III of FIG.

4 is an enlarged sectional view taken along line IV-IV of FIG.

5 is a longitudinal sectional view of a kneader showing another embodiment of the present invention.

FIG. 6 is a diagram showing the type of movement and temperature change of the material to be kneaded in the chamber of the kneader of the present invention as compared to the conventional case.

The present invention relates to a biaxial continuous kneader used for kneading macromolecular materials such as synthetic resins.

Conventionally, two-shaft continuous kneaders of this type have two axes arranged side by side, each of which has a chamber with a screw-shaped feed section and a kneading section with an elliptical or other cross-sectional kneading wing and in the order of material transfer. The material to be kneaded, which is continuously conveyed through the material supply port of the veneer chamber, is fed to the kneading unit by the conveying unit and is melted and kneaded in the kneading unit, and then is continuously discharged through the discharge port of the chamber. In such a configuration, the kneading portion usually has a feed vane twisted in the direction in which the material is conveyed and a return wing twisted in the direction in which the material is precious and the kneading portion extends in a constant range toward the front of the conveying portion. However, it has been found that conventional kneaders of this type are limited in their kneading ability and are often difficult to knead carbon materials depending on the type of material, that is, the carbon black grade, and the kneading time for these materials is insufficient.

In order to be able to use a material which requires an extended kneading time as such a kneading device, a rotor having a L / D (length / diameter) ratio larger than that of a conventional kneading device and two axially spaced kneading parts is used. Providing structure has been proposed. However, due to the relation of power transmitted by the shaft with the increase of L / D, it is difficult for the rotor rotational speed to be the same as the conventional general rotational speed from the point of view of the device and the device must be operated at low rotational speed. Cause problems.

(1) Low rotational speed operation reduces the feed force, that is, reduces the material conveying action of the feed section, thereby reducing the machining capacity.

(2) The resulting increased L / D and reduced feed force reduce the pressure of the material of the kneading section and reduce the shear and stirring action.

(3) When the L / D is increased, the heat generation rate is rapidly increased as shown by the curve A in FIG. 6 and causes an adverse effect or heat reduction on the quality of the material to be kneaded.

This defect must be eliminated before the kneading time is extended.

In view of the above, the present invention is to increase the kneading time and kneading range to increase the kneading time and the kneading range of the material of the conveying portion, to maintain the appropriate pressure on the material of the kneading portion and to generate excessive heat so that the material that requires an extended kneading time can be used in the device To prevent deterioration of the vagina, and to prevent irregular kneading caused by the so-called short passage phenomena where the material passes through the kneading section without being kneaded. If necessary, a bent hole is added to allow vacuum degassing of the contained volatiles in the material. Provide an axial continuous kneader.

According to the present invention, a chamber defining two horizontally connected cylindrical side-by-side chambers having a common discharge orifice at one end and two wing rotors positioned in the chamber space, the chamber at a position away from the discharge orifice A device for rotating the rotor having a receptacle which presses the material to be mixed into the space and receives the material and a conveying flight portion having a constant flight depth, and a portion twisted away from the direction of rotation and opposite to the direction of rotation; Having two axially spaced kneading sections with wings, the average force directed to the axial length by which the length and torsion ratio of the portion twisted in the opposite direction to the wing of each kneading section is applied to the material contained in the chamber space by the wing To push the material out through this orifice In an apparatus in which the length of the axial passageway of the entire material is not determined by the speed at which the material is received by the receiving device, the feeder having a feed flight on each initial end side of the rotor is different. On the respective rotor and radially movable wall larger in diameter than the flying portion on the portion and the combined rotor and adjusting the gap between the moving wall and the round cross-section and provided to a portion of the chamber outside of the round cross-section. Provided is a two-axis continuous kneader characterized by the installation of a throttle device between said axially spaced kneading sections having a provided round cross section.

Reference is made in detail to the embodiments shown in the drawings of the present invention.

Referring to FIGS. 1 to 4, FIG. 1 is a chamber, FIG. 2 is a material supply port installed at one end of the chamber 1, and FIG. 3 is a discharge orifice defining a material discharge port at the other end of the chamber 1. to be. Chamber 1 defines two cylindrically connected parallel chamber spaces with a common outlet orifice 3. Material supply port 2 has a receiving device (not shown) for receiving the material to be kneaded and forcing it into the chamber space. Two horns 4 arranged side by side in chamber 1 are supported to be supported at their ends to rotate in chamber 1 and are simultaneously rotated simultaneously in opposite directions by a motor, speed reducer gear, etc., not shown. Each of the rotors 4 has a round cross-section 71 and a second one connected to the moving wall of chamber 1 to constitute a first screw-shaped transfer portion 5 having a transfer flight portion 51 having a constant flight depth and 5 and a throttle device 7 described below. And a discharge section 10 arranged in the order as shown laterally from the conveying section 8 and the second mixing section 9 and the material supply port 2.

The diameter is larger than the transfer flight portion 51 of the first transfer portion 5 and the interlocked transfer portion 5. In the figure, the conveying flight part 51 of the conveying part 5 is shown in the form of three spiral screws, but may be a plurality of spiral screws or one spiral screw. Of course, the inner diameter is larger at the portion corresponding to the first conveying portion 5 when the chamber 1, which surrounds the rotor 4, two of which considers the rotor shape than the other portion. In the first kneading portion 6, the rotor 4 forms a kneading wing 61 which is not circular in cross section and protrudes outwardly suitable for generating shear and stirring operations between the wing and the inner wall surface of the chamber 1 and between the rotor 4. In the illustrated embodiment, the cross section with the blade wings protruding in three directions as shown in the cross section, but with the blade wings protruding in two directions may be oval or otherwise shaped. Usually the kneading wing 61 extends from the initial end of the kneading part to a suitable intermediate point, where the rotor is twisted at a suitable induction angle in the direction away from the direction of rotation, ie the direction in which the rotor transports the material forward (the part is Hereinafter referred to as feed vane 62), from which the rotor twists at the proper induction angle in the opposite direction, ie in the direction in which the rotor returns the material, to the end of the kneading part 6. (The above part is referred to later as return wing part 63). In this case, the axial force exerted by the wing 61 on the material contained in the chamber space is such that the length and torsion ratio of the return wing 63 are not sufficient to push the material through the discharge orifice. Thus, the length of the entire axial passage of material through the chamber space is determined by the speed at which material is received by the receiving device. The interaction of materials and the generation of pressure lead to operations such as shearing, stirring and dispersion.

A round cross section 71 is located at the end of the first kneading section 6 and a moving wall 72 is provided outward above the round cross section 71 at a portion of the chamber 1. The moving wall 72 and the rounded end portion 71 are coupled to each other to constitute the throttle device 7. The moving wall 72 is radially movable to be sealed in the chamber 1 and is driven by the air cylinder 73. The gap between the moving wall 72 and the round cross section 71 is changed to the radial movement of the moving wall 72.

The moving wall 72 and the distal end 71 cooperate to form the throttle mechanism 7 with each other. The moving wall 72 is enclosed in chamber 1 and movable radially and driven by an air cylinder 73. The gap between the moving wall 72 and the distal end 71 changes with the radial movement of the moving wall 72.

The second feed part 8 located in front of the distal end 71 is threaded as in the case of the first feed part 5, but in this part the feed wings 81 on the rotor 4 need not mesh with each other. Like the first kneading section 6, the second kneading section 9 is provided with a kneading blade 91 composed of a supply blade section 92 and a return wing section 93. The discharge section 1C is located adjacent to the terminal of the rotor 4 in front of the second mixing section 9 and has a straight blade or other suitable shape.

Orifice 3 on the discharge side of chamber 1 usually has a transverse wall 31 suitable for opening and closing, so that the opening and closing operation on the transverse wall 31 for adjusting the opening degree of the orifice is possible to control the discharge of the mixed material and the discharge resistivity. Moreover, if necessary, chamber 1 is provided with an exhaust hole 11 for vacuum degassing of volatiles contained in the material. In this case, the exhaust hole 11 is located between the throttle mechanism 7 and the moving wall 72 of the material discharge portion, and more suitably disposed at a position corresponding to the second supply portion 8 closer to the moving wall 72.

5 shows a kneader according to another embodiment of the present invention. In this embodiment, the second supply section 8 provided in the first embodiment described above is omitted. That is, in Fig. 5, the two rotors 4, the second supply part 5, the first kneading part 6 and the throttle mechanism 7 are the same as those in the first embodiment. After the distal end 71 of the throttle mechanism 7 the second feed section is omitted and instead is provided with a second kneading section 9 'extending longer than the first embodiment, accompanied by a discharge section 10 arranged in the terminal of the rotor 4. In such a structure, the exhaust hole is provided to the chamber 1 at an appropriate position in front of the moving wall 72 if necessary, although not shown.

In the present embodiment, the feed wings 62, 92 and the feedback wings 63, 93 are shown in succession to each other, but such a continuous arrangement is not necessary and the discontinuous wings with phase shift at the junction between the feed wings and the return wing are required. Used.

The operation of the present kneader is described below. In the kneading operation, the material to be kneaded which is continuously supplied at a constant rate by the unsuccessful feeder or the like is moved forward by the feeding part 5 at the start end of the rotor 4. In this case, since the L / D of the machine is increased, the rotor 4 is driven at a lower rotational speed than that of the conventional machine which takes into account the temperature of the material. However, an increase in the feed 5, mated with the feed wings of the two rotor 4 meshing together, ensures that the diameter is sufficiently high even under these conditions. Moreover, materials with such properties as small bulk density, warning and agility can be completely converted.

The material supplied from the supply part 5 is susceptible to such actions as shearing, stirring and dispersing in the first mixed water 6 combusted in the molten state, where it is provided to the second mixing part 9 through a throttle mechanism or the second mixing Supplied directly to part 9 '.

In this case, the moving wall 72 is moved axially prior to adjusting the gap between the moving wall 72 and the distal end 71 of the rotor 4 in order to narrow the groove passage properly, so that the throttle mechanism 7 is moved to the first kneading part 6 and the first. It plays the role of appropriately controlling the pressure of the material of the two kneading section 9 or 9 '. Furthermore, in connection with this pressure control operation, the first kneading section as indicated by curve B of FIG. 6 to control the temperature rise due to heat generation by shearing and to avoid the temperature rise to the extent that there is a deterioration of quality there. The temperature is made uniform for the range from 6 to the second kneading portion 9 or 9 '.

Moreover, this groove passage throttle function prevents unbalance of mixing caused by material passages. Furthermore, at the discharge end, the rod material sealing affected by the molten material of the end and the orifice 3 maintains the airtight of the chamber while affecting the vacuum degassing described later.

When it is necessary to increase the supply force when supplying the material to the second kneader through the throttle mechanism 7, a structure having the second supply part 8 shown in the first embodiment is used, but the supply part 5 along the starting end of the rotor 4 is Since a sufficient supply force can be provided, the structure shown in the second embodiment is used, where it is located in the enhancement of the degree of mixing. If the exhaust holes 11 are provided at positions corresponding to the second supply section 8 or the second mixing section 9 'described above, they can be connected to a vacuum pump or the like not implemented for vacuum degassing, and the volatile content of the mixed material The possibility of air bubbles being removed and left in the product can be ruled out. In this case, vacuum degassing uses the installation location of the throttle mechanism 7 and the orifice 3 at the outlet end sealed with the material, at a tendency angle suitable for the supply of the material so that such areas are not filled with the material, and the supply wing of the second supply 8 2) The kneading wing of the 2nd kneading part 9 'is provided, and it becomes possible. The supply (not shown) is provided at a position corresponding to the second supply 8, etc., as chamber 1 is required, and glass fiber or other material may be supplied through the portion that causes damage to the machine or causes rapid wear.

The second kneading portion 9 or 9 'interacts with the first kneading portion 6 to improve the degree of kneading of the material and serves to uniformly mix the material superimposed on the second supply portion 8 and the like.

The discharge orifice 3 for the discharge end of chamber 1 adjusts the degree of opening to change the resistance to the discharge of the molten material, whereby the degree of mixing can be controlled. However, the structure of the orifice 3 is not limited to the embodiment, and the named moving member is provided in the groove passage to adjust the discharge resistance. Furthermore, it is necessary to pellet the kneaded material, which is connected to the discharger as well as to the discharge side of the kneader for pelletizing or the discharge and pelletizing device is attached to the kneader via a gear pump. In this case, since the present kneader provides a sufficient degree of kneading, it is not necessary to use an ejector to compensate for the defect of kneading effect, and the use of an impact gear pump is sufficient.

As described above, in the two-rotor continuous kneading machine of the present invention, the facility of two axially isolated kneaders in each of the rotor and the increased L / D is provided on each rotor because of insufficient kneading time available. It provides an extended kneading time and a sufficient degree of kneading in such a material that is difficult to process by a conventional machine having only one kneading part. Furthermore, at the start end the feeds of the rotors are increased in diameter and their feed vanes are intermeshed, and despite the slowing down of the rotational speed of the rotor due to the increased L / D, a high material feed force is obtained and the risk of reducing from the processability There is no surname. Furthermore, due to the provision of the throttle mechanism, which is arranged between the front and rear kneading sections and provided with the angular rotor provided on the part of the chamber and the distal end provided on the radially movable wall to adjust the gap therebetween, the decrease in pressure is caused by the material of the chamber. It is hindered by the instrument to moderate pressure, and the material temperature of the chamber is homogeneous to avoid sensitive temperature rises causing order, while the short passage of material reduces the imbalance of mixing. The properties of the products mixed by the integrated energy effect have been greatly improved. Moreover, the throttle mechanism is simple to manufacture and easy to operate, and because of the material sealing provided between such a part and the discharge end, the removal of volatiles by vacuum degassing is made possible by providing an exhaust hole therebetween. Thus, the present invention provides a great many useful effects.

Claims (1)

Two horizontally connected cylindrical chamber spaces having a common discharge orifice at one end and a rotor having two wings positioned in the chamber space and material spaced apart from the discharge orifice in the chamber space. With a device for rotating each rotor having a receptacle for the material to be pushed into and intermixed with a conveying flight part having a constant flight depth, and a wing having a part twisted away from the direction of rotation and a part twisted in the opposite direction Axial mean forces with two axially spaced kneading sections, the length and torsion ratio of the twisting section in the opposite direction on the blades of each kneading section applied to the material contained in the chamber space by the blades, means that the material Not enough to push through the orifice Wherein the length of the entire axial passage of the material is determined by the speed at which the material is received by the receiving device, wherein the conveying portion provided with the conveying flight portion of each initial short side portion of the rotor is provided with another portion. Between the movable wall and the rounded cross section having a larger diameter diameter than the flying portion on the two rotors coupled to each other and having a radially movable wall mounted on a portion of the chamber outside the rounded cross section and a rounded cross section mounted on each rotor. A two-axis continuous kneader, characterized in that the throttle device is installed between the axially spaced kneading section for adjusting the gap of the.

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