JPS601797Y2 - Leakage prevention device for kneading machines, etc. - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a leakage prevention device between a rotating shaft and a container through-hole in a kneading and kneading machine for kneading and mixing viscous substances such as rubber and plastics.

The kneading and kneading machine, as shown in FIG.
, 2 are provided with through holes 3, 3 to allow the rotating shaft 4 to pass therethrough, a stirring blade 5 is installed inside the container of the rotating shaft 4, and bearings 6, 6 are provided outside the rotating shaft 4 to support the shaft 4. The shaft 4 is equipped with gears, 7 clutches, a transmission, etc. 8 to rotate the shaft.Furthermore, in a pressurized kneading machine, a pressurizing lid 9 is provided on the container 1 and the material is heated under pressure. is kneaded.

Preventing leakage in the through holes 3, 3 is an important issue in such devices, but conventional leakage prevention devices have a structure in which a gland packing is stuffed into the packing chamber with a packing presser to seal the gap with the rotating shaft. The purpose of this was to use a gland packing to prevent leakage along the surface of the rotating shaft.

However, with such a structure, the material to be kneaded permeates between the fibers that make up the packing, so during use, the sticky and highly viscous material to be kneaded seeps into the inside of the packing, deteriorating the quality of the packing. Since it is sandwiched between a fixed packing chamber and a rotating shaft, the fibers that make up the packing are cut and damaged in a short period of time, resulting in the packing having to be replaced frequently.

Moreover, replacing the conventional gland packing requires a lot of effort over several hours even when using tools such as a packing tool, making this packing replacement work extremely troublesome for the equipment user. Ta.

The purpose of the present invention is to solve the above-mentioned drawbacks, to provide a kneading machine with a simple structure, in which the leakage prevention part is always kept clean, maintenance work is completely or significantly reduced, assembly work or packing replacement work is extremely easy. The purpose is to provide a leakage prevention device such as the following.

The leakage prevention device of the present invention is made of plastic that does not permeate the material to be kneaded and does not undergo plastic deformation due to temperature and pressure during use. The most characteristic feature is that it has a gasket that fits and whose inner end surface abuts a step plane formed at the end of the stirring blade.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows a longitudinal sectional view of an embodiment of the present invention.

A rotating shaft 4 passes through the through hole 3 in the side wall 2 of the container, and a stirring blade 5 is attached to the rotating shaft 4.

The end face of the stirring blade 5 forms a step plane 14 which is close to the inner surface of the side wall of the container, is a plane perpendicular to the rotation axis, and has a diameter larger than the rotation axis.

A gasket 16 is fitted between the through hole 3 and the rotating shaft 4.

This packing 16 is made of a material that is chemically stable without permeability of the materials to be kneaded, has a small coefficient of friction, and does not undergo plastic deformation due to temperature and pressure during use, and has an overall cylindrical shape. The outer circumferential surface of the packing fits into the inner surface of the through hole 3 in a tight spring state, and the inner end surface of the packing fits into the step plane 1.
4, and preferably a sufficient gap 11 is provided between the inner circumferential surface and the rotating shaft surface.

The packing materials of the present invention include plastics such as phenolic resin, urea resin, polyester resin, melamine resin, and silicone resin, mixed materials of these plastics, or fibers made of these plastics or mixed materials of these plastics. In addition to impregnated knitted fabrics or so-called engineering plastics, metal materials such as ebonite, carbon, and lead alloys can be used.

The outer end surface 12 of the packing 16 is pressed inward in the axial direction by a packing holder 17, and due to the inclination of the packing pressing surface, the pressing force by the packing holder 17 is divided into the force pressing the packing against the step plane 14 and the inner surface of the through hole. The force is applied to press the

An annular member 18 made of a super wear-resistant material is embedded in a portion of the step plane 14, which is the end face of the stirring blade, which is in contact with the packing 16.

As this super wear-resistant material 18, for example, cemented carbide, ceramic, etc. are used.

The packing 16 has a cylindrical integral bottom shape, as well as
16 divided into two parts along the axial direction as shown in Figure 3
1,162 may be glued 163 to form a cylindrical shape, or as shown in FIG.
Divided into two stages of 65, each with an axial cut of 166
It is also possible to provide a rotary shaft and insert or remove it across the rotating shaft.

According to the present invention, a cylindrical hard packing made of plastic molded pieces that does not permeate the material to be kneaded and does not cause plastic deformation is used, so it is similar to the case where a conventional ground packing made of woven fibers is used. There is no deterioration or damage to the product, and it is kept extremely clean at all times.For example, even when changing the coloring of the material to be mixed, there is a risk that the previous coloring material may seep out and cause color defects even if the packing is not replaced each time. This is extremely convenient for the kneader user.

Furthermore, since the part of the packing that contacts the rotating shaft is only the inner end face, which has the smallest area, friction and loss are extremely small.

Furthermore, when manufacturing a new one, you can use a cylindrical packing, and when it wears out and need to be replaced, you can break off the old backing and use the split packing shown in Figures 3 or 4. Replacement work becomes easier.

Further, according to the present invention, the packing 16 of the step plane 14
An annular member 1 made of a super wear-resistant material on the part where the inner end surface of the
8 is embedded, even if the packing 16 wears, the annular member 18 hardly wears.

This is particularly effective in kneading non-polluting plastics mixed with stone powder such as calcium carbonate, magnetic memory materials mixed with iron oxide powder, etc., and even in the kneading of ordinary rubber and plastic materials. It has the effect of not requiring repair work during its service life.

According to experiments, a cotton cloth impregnated with a mixture of phenolic resin and fluorine resin was used as the packing material 16.
As a result of continuous use for one year using ceramic as the wear-resistant member 18, the packing was worn by approximately 10+y+m, while the wear of the wear-resistant member was not visible to the naked eye;
mm or less), the end face of the packing 16 was smooth with no peeling or burrs, and the sealing effect was good.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing a kneading machine according to the present invention, Fig. 2 is a longitudinal sectional view showing an embodiment of the main parts of the invention, and Figs. 3 and 4 are modifications of the packing 16 in Fig. 2. FIG. 1... Container, 2... Side wall, 3... Through hole, 4...
・Rotating shaft, 5... Stirring blade, 14... Step plane, 1
6... Patsukin, 17... Patsukin suppressed, 18...
・Super wear-resistant material.

Claims (1)

[Scope of utility model registration request] A leak prevention device in the side wall through hole of a device in which a stirring blade is attached to a rotating shaft penetrating the side wall of a kneading/mixing container has no permeability to the material to be kneaded and substantially plastic deformation occurs due to temperature and pressure during use. A generally cylindrical packing is cut out of a non-produced material and fitted into the inner circumferential surface of the through hole,
A step plane having a diameter larger than the rotating shaft is formed at both ends of the stirring blade so as to face the inner surface of the side wall of the container, and a super wear-resistant material is embedded in the part of the step plane that is in contact with the inner end surface of the packing. Leakage prevention for a kneading machine, etc., characterized in that the packing is provided with a packing retainer that pressurizes the packing from the outside of the side wall of the container, and is configured to press and fix the packing against at least the inner surface of the through hole and the flat surface of the step part. Device.