JPS6223544Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a continuous kneading machine that kneads materials with a small coefficient of friction and materials with a small bulk specific gravity without reducing production volume.

Some single-screw extruders and twin-screw extruders have traditionally used slippery materials with a low coefficient of friction,
When targeting materials with low bulk specific gravity, devices that force the material into an extruder have been used;
In a two-shaft continuous kneading machine that rotates at high speed, when the feed hopper of the kneading machine is filled with material, the material is often eaten into the kneading machine, resulting in an overload. Therefore, it is common practice to control the supply amount by providing a quantitative feeding device upstream of the feeder section, and to control the production amount separately from the rotation speed of the rotor of the kneading section. That is, the amount of material supplied is small compared to the processing capacity of the kneading section of the kneader, and the kneader is operated in a so-called starved state. However, when kneading powder materials such as hard vinyl chloride or carbon black, the feeding capacity of the feed section decreases because the friction coefficient of the material is small, or the feeding capacity is insufficient because the bulk specific gravity of the material is small. A situation may occur in which the production capacity of the kneader does not increase sufficiently.

Therefore, in order to prevent such insufficient feeding capacity of the kneading machine, countermeasures have been considered, such as increasing the rotational speed of the rotor in the kneading section or increasing the length of the screw in the feed section. However, increasing the rotational speed of the rotor increases heat generation of the material, and there are problems such as thermally unstable and temperature-limited materials that are likely to decompose. In addition, increasing the size of the screw in the feed section increases the overall size of the machine and increases costs. At the same time, the bending stress applied to the rotor also increases, shortening the life of the machine and kneading high-viscosity materials. There are restrictions that prevent it.

The present invention was provided for the purpose of solving such conventional problems, and its features include a feed section, a kneading section, a squeezing section, and a discharge section, and a kneading section. is equipped with a winged rotor having sending blades and returning blades, and the average force in the axial direction on the material in the kneading section is insufficient to extrude the material from the constriction section, and the entire material passing through the kneading section is In a continuous kneading machine, the material movement depends on the amount of material fed from the feed section, the material fed from the metering device is forcibly fed between the feed section and the metering device in the preceding stage. The main feature is that it is equipped with a forcible pushing device that pushes it into the section.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment. In FIGS. 1 and 2, 1 is a kneader main body of a two-screw continuous kneader, which includes a feed section 2,
A kneading section 3, a squeezing section 4, and a discharge section 5 are provided. The feed section 2 is for feeding the material supplied from the supply port 6 to the kneading section 3 side, and has a screw 7. The kneading section 3 is equipped with a winged rotor 8 that rotates integrally with the screw 7.
A feed blade and a return blade are formed in the axial direction, and the average force in the axial direction on the material in the kneading section 3 is set to an extent insufficient to extrude the material from the constriction section 4. The overall movement of the material through the kneading section 3 is therefore dependent on the amount of material fed from the feed section 2. The throttle section 4 is for adjusting the degree of kneading in the kneading section 3, and has a pair of upper and lower throttle plates 9, 10, each of which
0 can be adjusted up and down using cylinders 11 and 12. A supply hopper 13 is provided at the upper part of the feed section 2 side of the kneading machine main body 1, and this supply hopper 13 is configured so that the material from the material hoppers 14 and 15 is supplied in fixed quantities via quantitative supply devices 16 and 17. It's getting old. A forced pushing device 18 is provided in the supply hopper 13 to forcibly push the material therein into the feed section 2 . This forced pushing device 18 includes a vertical rotating shaft 19 supported on the upper end side, a stirring protrusion 20 and a screw 21 provided on the rotating shaft 19, and the rotating shaft 1
9 is rotationally driven by a motor 22.

In the above configuration, when kneading a material with a small friction coefficient, a material with a small bulk specific gravity, etc., the forced pushing device 18 is used to lightly force the material in the supply hopper 13 into the feed section 2. I'll push it in. As a result, the feeding of the material into the screw 7 in the feed section 2 is significantly improved, and the above-mentioned materials can be kneaded while increasing the production capacity of the kneader. In this case, the forced pushing device 18
The production volume is increased or decreased by controlling the rotational speed of the screw 21. However, in a kneading machine where the rotor 8 rotates at a high speed, if a large amount of material is fed, the kneading machine becomes overloaded and stops. Therefore, in order to prevent this, in addition to controlling the rotational speed of the screw 21, it is desirable to control the amount of material supplied by the quantitative supply devices 16 and 17 to maintain stable and constant kneading conditions. Also, if there are quantitative supply devices 16 and 17, the screw 2
1 can be selected within a certain range, and a kneaded material of constant quality can be stably obtained without overload or fluctuation in production.

Incidentally, a comparison between the present invention equipped with the forced pushing device 18 and the conventional one was as follows.

That is, when powdered hard vinyl chloride compound is kneaded in a kneader with a chamber inner diameter of 120 mm in the kneader body 1, conventionally, the rotor rotation speed is
The upper limit of production was 300Kg/h at 300rpm. At this time, if you look at the supply port 6 of the kneading machine main body 1, you will notice that the powder material has accumulated, and that the feeding force of the material in the feed section 2 is insufficient, so that the material is not fed into the kneading section 3 and is flowing backwards. I got it.

In contrast, in the kneader according to the present invention, the forced pushing device 18 fed the hard vinyl chloride compound at a rate of 800 kg/h, and the supply hopper 1
3. Stable operation was achieved without material accumulating.
Therefore, it is found that the production amount can be increased to 800 kg/h by this invention. The temperature of the recycled material was about 180°C. However, the rotor speed of the kneader was 400 rpm, and the forced pushing device 18 had a diameter of 150 mm.
It was a single-shaft screw type and was operated at a rotation speed of 300 rpm.

As shown in FIG. 3, the forced pushing device 18
3 may be reciprocated by the air cylinder 24, and in this case, when experimenting using the same kneading machine as described above, it is possible to increase the production amount from the conventional 300 Kg/h to about 600 Kg/h. It was hot. However, the area of the pressing part of the pushing body 23 is 100mm x 150mm.
mm, the stroke was 300 mm, and it was driven by a 2 Kg/cm ² air cylinder 24. In this case,
Load fluctuations are slightly larger than with the screw type, but this is not a problem.

As detailed in the embodiments above, according to the present invention,
Since the material is forcibly pushed into the feed section by the forced pushing device, the material can be reliably bitten into the feed section even if the rotor rotational speed is kept at a low speed.Therefore, the coefficient of friction is small, making it easy to slip. Even materials with low bulk specific gravity can be stably and uniformly kneaded, and a uniform kneaded product can be obtained while maintaining sufficient production capacity. In addition, materials that easily generate heat and materials that are easily thermally decomposed can be stably kneaded. Moreover, since there is no need to lengthen the feed section of the kneader, the rotor shaft can be shortened, and the improved mechanical strength makes it possible to knead high-viscosity materials.Furthermore, the compactness reduces manufacturing costs and production. Sexual enhancement is possible.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing one embodiment of the present invention;
The figure is a block diagram of the aperture section, and FIG. 3 is a block diagram showing another embodiment. 1... Kneading machine main body, 2... Feed section, 3...
Kneading section, 4... Squeezing section, 5... Discharge section, 8... Winged rotor, 13... Supply hopper, 16, 17...
...Quantitative supply device, 18... Forced pushing device.

Claims (1)

[Scope of utility model registration request] The kneading section is equipped with a feed section, a kneading section, a constriction section, and a discharge section, and the kneading section is equipped with a winged rotor having sending blades and return vanes. In a continuous kneading machine, the amount of material is insufficient to extrude the material, and the overall movement of the material through the kneading section depends on the amount of material fed from the feed section. 1. A continuous kneading machine characterized in that the continuous kneading machine is equipped with a forcible pushing device that forcibly pushes the material supplied from the quantitative feeding device into a feed section.