JPH04276405A - Enclosed kneader - Google Patents

Abstract

PURPOSE:To get rid of changing in compounding ratio of an additive caused by sticking of the additive on the circular arc face of the projected part of a drop door by peeling partially a kneaded substance which tends to wind itself round on a rotor by means of a plurality of projections on the circular arc face of the projected part of the drop door. CONSTITUTION:The projected part of a drop door 1 is constituted of a circular arc face 1a along the traces of rotors 4 and 5 of both sides, a gentle slope 1b in the neighborhood of the top forming a projected space for a thermocouple 6 and a plurality of projections 2 provided on the circular arc face 1a. Even if a kneaded substance wherein various additives are kneaded tends to wind itself round on the rotors 4 and 5 in an kneader 3, it is possible thereby to peel it off and flow of the kneaded substance is changed on the circular arc face 1a. Therefore, even if the additives stick on the circular arc face 1a of the projected part of the drop door 1, they can be scraped down by changing in flow of the kneaded substance.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an internal kneading machine for kneading rubber, plastic, etc. together with various additives.
In particular, the present invention relates to something that prevents additives from sticking to the drop door due to the material being kneaded around the rotor.

0002

2. Description of the Related Art Conventionally, there is an internal kneading machine of this type as shown in FIG.

In FIG. 5, reference numeral 11 denotes an inlet for introducing a predetermined amount of the material to be kneaded together with additives into the hopper 12;
13 is a floating weight attached to the piston shaft 14 and installed in the hopper 12 so as to be able to move up and down. 3 is a kneading chamber that forms a cylindrical sealed space, which is two circles with communicating cross sections, together with the above-mentioned floating weight 13 and the below-described drop door 1, and houses two rotors 4 and 5 that rotate in different directions. ing. The kneading chamber 3 is located at the lower convex portion formed by the two circular arcs in the closed space of the kneading chamber 3.
A drop door 1 that can be opened and closed is provided, and a thermocouple 6 is protruded from the top of the convex portion of the drop door 1 to measure the temperature of the material to be kneaded in the kneading chamber 3. There is.

As shown in FIG. 6, the convex portion of the drop door 1 has an arcuate surface 1a along the loci 4a, 5a of the rotors 4, 5 on both sides, and a loose surface near the top that forms the protruding space 7 of the thermocouple 6. It is composed of a slope 1b. Further, as shown in FIG. 7 (view from arrow B in FIG. 6), the rotors 4 and 5 are each provided with two long wings 4b, 5b and two short wings 4c, 5c, and these wings 4b, 4c , 5b, 5c extend spirally around the axes of the rotors 4, 5, and the long blades 4b, 5b and the short blades 4c, 5c are wound in opposite directions.

[0005] Next, the operation of the internal kneader having such a configuration will be explained. First, materials to be kneaded such as rubber and plastic are fed into the hopper 1 along with various additives from the input port 11.
Pour the specified amount into each container. The material to be kneaded and additives put into the hopper 12 are forced into the kneading chamber 3 by the pushing action of the floating weight 13. and,
With the kneading chamber 3 sealed, the rotors 4 and 5 are rotated in different directions. In the kneading chamber 3, the materials to be kneaded are transferred to the rotor 4,
The liquid flows in the axial direction of the rotors 4 and 5 while being subjected to shearing action in the tip clearance 15 between the tips of the blades 5 and the inner wall 3a of the kneading chamber 3. Furthermore, since one rotor 4 and the other rotor 5 rotate in different directions, the material to be kneaded also flows between the left and right kneading chambers, and the material to be kneaded flows into the kneading chamber 3 as shown by ■ in FIG. As a whole, the flow gradually becomes larger and larger.

During kneading, the gentle slope 1b of the convex part of the drop door 1
The material to be kneaded expands in the space 7 formed between the trajectories 4a and 5a of the rotors 4 and 5 and wraps around the thermocouple 6 protruding from the top of the convex portion of the drop door 1.
The temperature of the material to be kneaded is accurately measured, and appropriate operation can be performed by understanding the kneading state of the material to be kneaded. Then, when the kneading in the kneading chamber 3 is finished,
The drop door 1 provided at the bottom of the kneading chamber 3 is opened and the materials to be kneaded are discharged outside the machine, completing one cycle of kneading.

[0007]

[Problems to be Solved by the Invention] In the closed type kneading machine described in the prior art, the space 7 formed between the gentle slope 1b of the convex portion of the drop door 1 and the loci 4a, 5a of the rotors 4, 5.
The material to be kneaded which expands in
exposed on b. Then, as the rotors 4 and 5 rotate, this additive may be drawn onto the arcuate surface 1a of the convex portion of the drop door 1 and become fixed thereon. Moreover, some types of materials to be kneaded may tend to wrap around the rotors 4 and 5 during kneading, which reduces the flow of the materials to be kneaded in the kneading chamber 3. Therefore, the additive fixed on the arcuate surface 1a of the convex portion of the drop door 1 cannot be scraped off, and the additive remains fixed on the arcuate surface 1a of the convex portion of the drop door 1. As a result, the mixing ratio of additives in the material to be kneaded changes in each cycle, resulting in a problem that a desired kneaded material cannot be obtained.

The present invention has been made in view of the above-mentioned problems of the conventional technology, and its purpose is to prevent the additive from sticking to the arcuate surface of the drop door convex portion and causing the additive to It is an object of the present invention to provide an internal kneading machine in which the blending ratio of the ingredients does not change.

[0009]

[Means for Solving the Problems] In order to solve the above object, the internal kneading machine of the present invention has two rotors rotating in different directions and two circles in which the rotors are housed and whose cross sections communicate with each other. It comprises a cylindrical sealed space, a drop door that can be opened and closed provided on the lower protrusion formed by two arcs in the sealed space, and a thermocouple protruding from the top of the protrusion of the drop door. In the closed-type kneading machine, the convex part of the drop door has an arcuate surface along the rotor locus on both sides, a gentle slope near the top that forms the protruding space of the thermocouple, and a plurality of holes arranged on the arcuate surface. It is composed of protrusions.

0010

[Effect] During kneading, the material to be mixed that tries to wrap around the rotor is partially peeled off by the multiple protrusions arranged on the arcuate surface of the drop door protrusion, so the flow of the material to be kneaded on the arcuate surface changes. , scrape off the additive that tries to stick to the arcuate surface of the drop door protrusion.

[0011]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a drop door of an internal kneading machine of the present invention, and FIG. 2 is a view taken in the direction of arrow A in FIG. The overall configuration and operation of the internal kneading machine are the same as those explained in FIGS. 5 to 7, so the drop door of the internal kneading machine will be explained below, and
The same reference numerals are given to the parts having the same functions as those in FIGS. 7 to 7, and the explanation thereof will be omitted.

In FIG. 1, a drop door 1 is connected to a kneading chamber 3.
The drop door 1 is provided with a protrusion on the lower side formed by two circular arcs in the closed space so as to be openable and closable so as to form a part of the kneading chamber 3. Arc surface 1a along trajectories 4a and 5a and thermocouple 6
A gentle slope 1b near the top forms a protruding space 7. As mentioned above, some types of materials to be kneaded may wrap around the rotors 4 and 5 during kneading, and as a result, the additive remains stuck to the arcuate surface 1a. Therefore, in the present invention, a plurality of protrusions 2 are arranged on the circular arc surface 1a of the convex part of the drop door 1, and the plurality of protrusions 2 are used to rotate the rotors 4 and 5.
The flow of the material to be kneaded on the arcuate surface 1a was changed by peeling off the material to be kneaded that was about to wrap around the arcuate surface 1a.

The protrusion 2 is arranged on the arcuate surface 1a of the convex portion of the drop door 1 so as to have a gap with the loci 4a, 5a of the rotors 4, 5. The shape of the protrusion 2 is not limited to the cylindrical shape shown in FIG. 2, but may be, for example, a prismatic shape, a hemispherical shape, etc. that is optimal for peeling off the material to be kneaded that is about to be wrapped around the rotors 4, 5. The arrangement of the protrusions 2 is not limited to a straight line in the axial direction shown in FIG. 2; for example, the protrusions 2 may be arranged diagonally in the axial direction, arranged in two rows in the axial direction, or as shown in FIG. They may be arranged in a zigzag pattern in the axial direction. Furthermore, the rotor 4,
5 tends to occur at both ends of the rotors 4 and 5, especially at the ends of the long blades 4b and 5b, so as shown in FIG. Even if the projections 2 are provided only at both ends, the rotor 4,
The wrapping of the material to be kneaded around the material 5 can be eliminated to a considerable extent.

In this way, the arcuate surface 1 of the convex part of the drop door 1
By arranging a plurality of protrusions 2 in a space with gaps from the trajectories 4a and 5a of the rotors 4 and 5, materials to be kneaded such as rubber and plastics into which various additives have been kneaded can be mixed in the kneading chamber 3. Even if it tries to wrap around the rotors 4 and 5 during kneading, it can be peeled off by the plurality of protrusions 2 on the arcuate surface 1a, so the flow of the material to be kneaded on the arcuate surface 1a changes. Therefore, the material to be mixed that expands in the space 7 formed between the gentle slope 1b of the convex part of the drop door 1 and the loci 4a, 5a of the rotors 4, 5 is slammed against the gentle slope 1b, and forms a kind of powder. Or, even if a pellet-shaped additive is exposed on the gentle slope 1b and this additive is drawn onto the circular arc surface 1a of the convex portion of the drop door 1 and tries to stick, the flow of the material to be kneaded on the circular arc surface 1a changes. This makes it possible to scrape off the additive that is trying to stick on the arcuate surface 1a of the convex part of the drop door 1, and only a small amount of the additive remains stuck on the arcuate surface 1a of the convex part of the drop door 1, and one cycle. The blending ratio of additives in each material to be kneaded does not change that much.

In the above embodiment, a so-called four-blade rotor was described in which each rotor has two long blades and two short blades, for a total of four blades. The present invention can also be applied to a so-called two-blade rotor having a total of two blades, and the same effects as in the above embodiment can be obtained.

[Effects of the Invention] Since the present invention is constructed as described above, it produces the following effects.

By arranging a plurality of protrusions on the arcuate surface of the drop door protrusion so as to have a gap with the locus of the rotor, materials to be kneaded such as rubber and plastics into which various additives have been kneaded can be moved into the kneading chamber. Even if the kneaded material tries to wrap around the rotor during kneading, it can be peeled off by the plurality of protrusions on the arcuate surface, which changes the flow of the material to be kneaded on the arcuate surface. Therefore, the material to be mixed that expands in the space formed between the gentle slope of the drop door convex part and the locus of the rotor is slammed against the gentle slope, and some kind of powder or pellet additive is thrown onto the gentle slope. Even if this additive is drawn onto the arcuate surface of the drop door protrusion and tries to stick, the additive will try to stick to the arcuate surface of the drop door protrusion due to the change in the flow of the material to be kneaded on the arcuate surface. This allows the additives to be scraped off, and only a small amount of the additives remain stuck on the arcuate surface of the drop door protrusion, and the blending ratio of the additives in the material to be kneaded in each cycle does not change that much. do not have.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a drop door of an internal kneading machine of the present invention.

FIG. 2 is a view taken along arrow A in FIG. 1;

FIG. 3 is a diagram showing another drop door.

FIG. 4 is a diagram showing another drop door.

FIG. 5 is a sectional view of a conventional internal kneader.

FIG. 6 is a diagram showing a drop door of a conventional internal kneading machine.

FIG. 7 is a view taken along arrow B in FIG. 6;

[Explanation of symbols] 1 Drop door 1a Arc surface 1b Gentle slope 2.Protrusion 3 Kneading room 4, 5 Rotor 4a, 5a Rotor trajectory 6 Thermocouple

Claims (1)

[Claims] Claim 1: Two rotors rotating in different directions; A cylindrical sealed space in which the rotors are housed and whose cross sections are two circles communicating with each other; A lower part formed by two circular arcs in the sealed space; In a closed kneading machine equipped with a drop door provided on a convex portion that can be opened and closed; and a thermocouple protruding from the top of the convex portion of the drop door, the convex portion of the drop door is connected to the locus of the rotor on both sides. an arcuate surface along the surface, and a gentle slope near the top that forms the protruding space of the thermocouple.
An internal kneading machine characterized by being composed of a plurality of projections arranged on an arcuate surface.