JP2552590Y2 - Hermetic rubber kneader - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a closed rubber kneader.

[0002]

2. Description of the Related Art Conventionally, a closed rubber kneader is provided, for example, as shown in FIG.
A pair of rotatable bite-type rollers 3 and 3 rotatable inward by a motor (not shown) and a drop door 4 for discharging kneaded rubber which is opened and closed by opening and closing not shown (not shown).
And is fixed to one end of a piston rod 11 connected to a piston 10 in an air cylinder 9 fixed above the hopper 5 by being incorporated in a hopper 5 provided above the kneader main body 1. And a floating weight 8 which switches the air in the upper and lower air chambers 12 and 13 by a switching valve (not shown) and moves up and down. The floating weight 8 is supplied by opening a hopper door 7 having an input port 6 provided in the hopper 5. After the rubber and the compounding agent have been charged through the opening 6, the mixture is lowered and the kneaded rubber is press-fitted into the kneading chamber 2 to be kneaded. After the kneading is completed, the drop door 4 is opened and the kneaded rubber is discharged from below and discharged. The rubber is processed into a sheet shape by an open roll machine or the like (not shown), and is again charged and kneaded with a vulcanizing agent such as sulfur from the charging port 6. When the kneading is completed, the drop door 4 is opened again and the kneaded rubber is discharged from below.

[0003]

In the conventional closed-type rubber kneader, the temperature of the kneaded rubber increases during kneading, so that when a vulcanizing agent is added, a vulcanization reaction occurs and molding in a subsequent process becomes impossible. . For this reason, a step of discharging the kneaded rubber once, cooling it, and kneading it again with a vulcanizing agent in a kneader is required.

[0004] The present invention has been developed in view of such a situation, and an object thereof is to enable cooling of kneaded rubber in a kneading chamber.

[0005]

The structure of the present invention for achieving the above object will be described with reference to FIG. 1 corresponding to an embodiment. In the present invention, a pair of rotatable bites is inserted into a kneading chamber 2. In a hermetic rubber kneader provided with a roller 3, a drop door 4 that can be opened and closed and a floating weight 8 that can be moved up and down, a plurality of nozzles are provided along the axial direction of the roller 3 on the upper inner wall of the kneading chamber 2. And a spraying device 16 connected to the nozzle 14 and spraying the cooling medium into the kneading chamber 2 from the nozzle 14.

[0006]

According to the present invention, when the rotor is rotated by the above-mentioned means and the rubber and the compounding agent are charged, the floating weight is lowered, and the rubber and the compounding agent are pressed into the kneading chamber and pressurized to knead them. After passing the first peak, it descends and turns again to reach the second peak. After passing this second peak, the floating weight is raised, and the spraying device is operated to spray the cooling medium from the nozzle. After that, after the kneaded rubber temperature has dropped, a vulcanizing agent is added,
The floating weight is lowered again for kneading, and after kneading is completed, the drop door is opened to discharge the kneaded rubber.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. 1. In FIG. 1, reference numerals 1 to 13 denote the same parts as those in the conventional example of FIG. In the present invention, a plurality of nozzles 14 are provided along the axial direction of the roller 3 on the upper inner wall of the kneading chamber 2, and the nozzles 14 are connected to the nozzles 14 via pipes 15. A spraying device 16 composed of an electromagnetic valve for spraying in the form of a mist was provided in 2.

[0008] After rotating the rotor 3 and charging the rubber and the compounding agent, the floating weight 8 is lowered,
When the rubber and the compounding agent are pressed and kneaded into the kneading chamber 2 and kneaded, the kneading power generally rises sharply after passing the first peak, as shown in FIG. , Then descends again and reaches the second peak. It is considered that the rubber is crushed up to the first peak in the kneader, and the dispersion of the compounding agent is progressing up to the second peak thereafter. On the other hand, the kneading rubber temperature in the kneading chamber 2 is
It increases almost in proportion to the integrated value of the applied power.

After passing the second peak of the kneading power, the floating weight 8 is raised, the spraying device 16 is opened, and the cooling medium is sprayed from the spray nozzle 14 in the form of mist. A sulfuric acid is charged and the floating weight 8 is lowered again and kneaded. When the kneading is completed, the drop door 4 is opened and the kneaded rubber is discharged from below.

The spray nozzle 14 can easily spray, for example, cryogenic N ₂ gas at a very low temperature as a cooling medium other than water.

[0011]

As described above, according to the present invention, a plurality of nozzles are provided on the upper inner wall of the kneading chamber along the axial direction of the roller, and the spraying device is connected to the nozzles and sprays the cooling medium from the nozzles into the kneading chamber. Since the temperature of the kneaded rubber can be efficiently lowered in the kneading chamber during operation, the vulcanizing agent can be charged in one step, and the kneading time can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a diagram showing a power and temperature pattern during operation of the kneader of the present invention.

FIG. 3 is a sectional view showing a conventional example.

[Explanation of symbols]

 2 Kneading chamber 3 Roller 4 Drop door 8 Floating weight 14 Nozzle 16 Sprayer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Isamu Motomura 5-717-1 Fukahori-cho, Nagasaki-shi, Nagasaki Mitsubishi Heavy Industries, Ltd. Nagasaki Research Laboratory (72) Inventor Akira Yoshida 5-717, Fukahori-cho, Nagasaki-shi, Nagasaki 1. Inside of Nagaishi Engineering Co., Ltd. (56) References JP-A-2-136209 (JP, A) JP-B-55-41887 (JP, B2)

Claims (1)

(57) [Scope of request for utility model registration] 1. A sealed rubber kneader having a kneading chamber provided with a pair of rotatable bite-type rollers, a drop door that can be opened and closed, and a floating weight that can be raised and lowered.
A hermetically sealed rubber, wherein a plurality of nozzles are provided on the upper inner wall of the kneading chamber along the axial direction of the roller, and a spraying device connected to the nozzles and spraying a cooling medium from the nozzles into the kneading chamber is provided. Kneading machine.