JPS5945408B2 - Leak prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a kneader for kneading sticky and highly viscous materials such as rubber and plastics.

For kneading machines, especially pressurized kneading machines, preventing leakage between the container and the rotor shaft is one of the most important and difficult problems. Conventionally, a gland packing or the like has been used as a sealing body to prevent materials to be kneaded in a container from leaking around a rotating shaft.

However, with this type of product, the material to be kneaded permeates into the gaps between the fibers that make up the packing, causing the packing to change in quality.Especially, when materials of different colors are handled one after another as materials to be mixed, the inside of the packing may deteriorate. The pre-colored material that had seeped through seeped out, causing color defects such as stains on subsequent products.As a result, it was necessary to replace the packing each time the coloring of the material to be mixed changed. . However,
Replacing the conventional gland packing requires a lot of effort over several hours even using special tools such as a packing tool, so this packing replacement work is extremely troublesome for the equipment user. It was hot. The present invention was made in view of the above, and its main purpose is to prevent the material from seeping into the packing, to keep the rotating shaft surface of the leakage prevention part always dry and clean, and to ensure that the packing can be replaced for a long period of time. An object of the present invention is to provide a kneading machine equipped with an improved leakage prevention device that can be used without the need for a leakage prevention device. The first feature of the present invention is the structure of the kneading machine itself, that is, the diameter of both end faces of the stirring blade is larger than the inner diameter of the through hole in the side wall of the container, and a stepped portion is formed inside the through hole due to the shape of the rotor itself. It is a clever use of the existing structure.

The second feature of the present invention is that it can be used as a packing material for a leakage prevention device by heat or pressure. An integrally molded product made of a plastic material that is difficult to deform and is non-permeable is used while maintaining a gap with the surface of the rotating shaft.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a partial sectional view of a front view showing the entire kneader according to the present invention. Through holes 3, 3 are provided in the side walls 2, 2 of the container 1, through which the rotating shaft 4 passes, a kneading blade 5 is installed inside the container of the rotating shaft 4, and bearings 6, 6 are provided on the outside of the rotating shaft 4. The shaft 4 is supported by a shaft 4, and this shaft 4 is provided with a gear 7 clutch, a transmission, etc. 8 to rotate the shaft.Furthermore, in a pressurized kneading machine, a pressurized lid 9 is provided on the container 1. The materials are kneaded under pressure.

Leakage prevention devices 10, 10 between the rotating shafts 4 of the through holes 3, 3
is provided. Fig. 2 shows the leakage prevention device 1 of Fig. 1.
An enlarged cross-sectional view of 0 is shown.

The diameter of the end face of the blade 5 in the container 1 is larger than the inner diameter of the through hole 3, and therefore the end face of the blade 5 forms a step 14 with respect to the rotating shaft 4.

In the through hole 3, a substantially cylindrical fixing member 16 made of stainless steel or a metal treated with anti-rust treatment such as nickel plating or nickel chrome plating is attached to the container side wall 2 with a bolt 17.
Fixed. The smoothness of the inner circumferential surface of this fixing member 16 is important, and it is manufactured so that it will not rust even during long-term use. A main packing 18 is inserted so as to fit into the inner peripheral surface of this fixing member 16. The main bag 18 is made of an elastic material that is non-permeable, has a small coefficient of friction, and is not easily deformed by heat or pressure, such as fluorine resin or plastic such as nylon.
It is integrally formed into a cylindrical shape, and its outer circumferential surface fits smoothly into the inner circumferential surface of the fixing member 16, and its inner circumferential surface 19 has no obvious gap with the surface of the rotating shaft 4. 20, and its inner end surface 21 is in surface contact with the step plane 14. An auxiliary gasket 22 such as an O-ring gasket is fitted onto the outer end surface of the main gasket 18 in contact with the inner circumferential surface of the fixing member, and both the main gasket 18 and the auxiliary gasket 22 are pressed by a gasket retainer 23. That is, this packing retainer 23 is
It is supported so as to be slidable in the axial direction by bolts 24, 24 implanted in the fixing member 16, and receives an axially inward pressing force by compression spiral springs 25, 25, thereby causing the main packing 18 to move axially inward. While pressing the inner end surface 21 of the main packing 18 toward the step plane 14, the auxiliary packings 22, 22 are pressed against the inner peripheral surface of the fixing member and the main packing 1.
Press it against the outer end surface of 8. In the above configuration, since the inner circumferential surface of the fixing member 16 is always kept smooth, the spring 2
The forces 5 and 25 effectively act on the pressing force on the inner end surface of the main packing 18 to seal the leakage of the material to be crossed and also compensate for wear on this end surface.

Even if there is some leakage from the fitting surface between the main packing 18 and the fixing member 16, it will be completely sealed by the auxiliary packing 22. An air pipe may be provided toward the gap 20 between the narrow diameter portion of the rotating shaft 4 and the packing retainer 23, and compressed air may be blown out from time to time to blow away the leaked solidified material. As another embodiment of the present invention, the main packing 18 is
As shown in Fig. 3, a double structure of an inner part 18A and an outer part 18B is used, and as shown in Fig. 4, a cut structure is used so that the cut lines 28A and 28B do not overlap each other. Can be used wearing.

According to this embodiment, the work of replacing the gasket becomes easier. In still another embodiment of the present invention, the main packing 18 is formed integrally with fluororesin, nylon, etc., but the part that comes into sliding contact with the step plane 14 and the part that comes into contact with the fixing member 16 are provided. Using fluorine resin only,
Other parts can also be made of metal, wood, etc. As described above, the leakage prevention device according to the present invention
A non-permeable cylindrical packing that is difficult to deform due to heat or pressure is used, and the main leakage prevention is performed between one end surface of the cylindrical packing and the stepped plane;
It is characterized by the fact that a clear space is formed on the surface of the rotating shaft. This is essentially different from the method in which leakage was prevented by strong contact over the area.

According to experiments, when the main packing 18 of the present invention is molded from fluororesin, the amount of wear on the inner end surface is extremely small at 111 m or less under severe usage conditions for about half a year.
The equipment remained clean even without maintenance. Also,
Conventional gland packing requires several hours to replace, but in the case of the present invention, the work can be done by removing the fixing member 16 and moving it outward, so it can be completed in just a few minutes. We were able to. As described above, according to the present invention, the labor of the kneader user can be significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of a front view showing the entire embodiment of the present invention. FIG. 2 is an enlarged sectional view of the leakage prevention device 10 of FIG. 1. 3 is a sectional view showing a modified embodiment of the main packing 18 shown in FIG. 2, and FIG. 4 is a side view of FIG. 3. 1...
・Container, 2... Container side wall, 3... Through hole, 4... Rotor shaft, 5... Blade (stirring blade), 10... ...Leakage prevention device, 14.
...Stepped plane, 16...Fixing member, 18
...Main packing, 22...Auxiliary packing, 23...Putting restraint.

Claims (1)

[Claims] 1 A through hole is drilled in the side wall of the container containing the materials to be kneaded, and the shaft of a stirring blade for mixing the materials passes through the through hole and is supported by a bearing outside the side wall, and both ends of the stirring blade In the device, the diameter of the surface is larger than the inner diameter of the through hole, the fixing member is inserted into and fixed in the through hole and has a smooth cylindrical inner circumferential surface, and the outer circumferential surface is the same as the cylindrical inner circumferential surface of the fixing member. a main packing that fits, has a gap between its inner peripheral surface and the surface of the rotating shaft, is formed into a generally cylindrical shape with one end surface abutting the step, and at least one end surface is made of plastic; , an auxiliary packing such as an O-ring provided on the outside of the fitting surface between the fixing member and the main packing, and an auxiliary packing such as an O-ring that is attached to the outside of the through hole to press the packing toward the stepped portion and the auxiliary packing. A kneading machine characterized in that it is equipped with a leakage prevention device equipped with a packing suppressor that presses the packing against the inner circumferential surface of the fixing member.