JPH0443288Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a vacuum kneading machine that extrudes paste-like ceramic raw materials into a predetermined cross-sectional shape while deaerating them.

(Prior art) A vacuum kneading machine uses a perforated plate called a shredder to subdivide the paste-like raw material extruded by screw blades in the barrel and drop it into a vacuum chamber, thereby expelling gas and air inside the raw material. The material is removed and then extruded from the vacuum chamber to the outside by a secondary shaft, but frictional heat is generated when the raw material is forced into the barrel and when the raw material passes through the shredder, and this heat causes the raw material to Dried soil could be mixed into the extrudate, a serious drawback. In addition, among this type of vacuum clay kneading machine, in those in which the tip of the primary side screw blade on the vacuum chamber side is supported by a bearing sleeve, raw material inevitably enters this bearing part, causing friction in this part as well. Heat was generated, which exacerbated the problems mentioned above.

(Problems that the invention attempts to solve) This invention solves these conventional problems,
It was completed with the aim of creating a vacuum clay kneading machine that prevents the drying of raw materials due to frictional heat, thereby preventing the occurrence of the serious drawback of contamination of dried soil into extruded products.

(Means for solving the problem) The present invention provides a cooling body with a perforated plate attached to the side at the end of the primary barrel on the vacuum chamber side, and a cooling body with a perforated plate attached to the side, and a barrel in the center of the cooling body. A water-cooled sleeve is attached to support the tip of the shaft of the internal screw blade on the vacuum chamber side, and cooling water can be supplied to the cooling body and the sleeve with the cooling water temperature and amount set independently. It is characterized by the following.

(Example) Next, the present invention will be explained in detail by referring to the illustrated example.

In FIG. 1, reference numeral 1 denotes a primary side barrel with a screw blade 2 inside, 3 a vacuum chamber, and 4 a screw blade 6 inside for pushing out the raw material in the vacuum chamber 3 toward a nozzle 5. This is the secondary barrel.

As shown in an enlarged view in FIG. 2, a cooling body 8 having radial cooling water passages 7 is provided at the end of the primary barrel 1 on the vacuum chamber 3 side. This cooling body 8 has ring-shaped cooling water passages 9 and 10 in the center and outer circumference, and a perforated plate 11 is attached to the side surface on the vacuum chamber 3 side to form a shredder. If cooling water is supplied from the cooling water supply port 12, the cooling water cools the perforated plate 11 while flowing through the radial cooling water flow path 7, and is then discharged from the cooling water discharge port 13 at the upper end. In this embodiment, the perforated plate 11 is divided into a plurality of fan-shaped plates, but the entire plate may be one circular plate.

A water-cooled sleeve 15 is attached to the center of the cooling body 8 to support the tip of the shaft 14 of the screw blade 2 inside the barrel 1 on the vacuum chamber 3 side. The sleeve 15 has an annular cooling water passage 1 around it.
6, and cooling water is supplied from a cooling water supply port 18 at the lower end via pipes 17 built in at the 12 o'clock and 6 o'clock positions of the radial cooling water passages 7 of the cooling body 8. The cooling water is discharged from an upper end cooling water outlet 19 via an upper pipe 17.

The temperature and amount of cooling water of the cooling water flowing inside the cooling body 8 and the cooling water flowing inside the sleeve 15 can be set independently.

(Function) In the device configured as described above, the paste-like raw material for ceramics introduced from the raw material input port is fed under pressure by the screw blade 2 in the barrel 1 on the primary side, and is attached to the discharge port of the barrel 1. perforated plate 11
The raw material is divided into small pieces by the vacuum chamber 3 and dropped into the vacuum chamber 3, and the air and gas in the raw material are sufficiently deaerated in the vacuum chamber 3, and then the screw blade 6 of the barrel 4 on the secondary side is
This is similar to a conventional vacuum clay kneading machine in that the clay is extruded from the nozzle 5 by the vacuum kneading machine.

However, in the present invention, the perforated plate 11 is attached to the side surface of the cooling body 8, and the sleeve 15 that supports the tip of the shaft 14 of the screw blade 2 on the vacuum chamber 3 side is also a water-cooled sleeve. Therefore, the cooling water channels 7, 9, 10 of the cooling body 8 and the sleeve 15 are connected from the cooling water supply ports 12, 18, respectively.
If cooling water is supplied to the annular cooling water flow path 16, the perforated plate 11 and the sleeve 15 will be cooled extremely efficiently. As a result, heat generation when the raw material is forced into the barrel 1 and heat generation when the raw material passes through the perforated plate 11 is prevented, and drying of the raw material is effectively prevented. Further, it is possible to alleviate the frictional heat of the bearing portion due to raw materials inevitably entering the bearing portion. Therefore, the vacuum clay kneading machine of the present invention can reliably prevent accidents in which dry soil gets mixed into products, and ceramic products such as insulators manufactured using raw materials extruded from this vacuum clay kneading machine can be used. can improve the quality of Moreover, in the present invention, since the cooling system for the cooling body 8 and the cooling system for the sleeve 15 are provided independently, the most effective cooling water temperature and cooling water amount can be set for each system, and the heat generation can be reduced. It becomes possible to efficiently cool the porous plate 11 and the sleeve 15, which have different causes, to different temperatures.

(Effects of the invention) As is clear from the above explanation, the invention prevents the drying of raw materials due to frictional heat inside the vacuum clay kneading machine, and prevents the occurrence of the serious drawback of dry soil mixing into the extruded product. As a vacuum clay kneading machine that eliminates the problems of conventional methods,
Its practical value is extremely great.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing an embodiment of the present invention, Fig. 2 is a partially cutaway side view showing an enlarged view of the main part, and Fig. 3 is a partially cutaway side view showing the main part enlarged. It is a front view. 1...barrel, 2...screw blade, 3...
Vacuum chamber, 8... Cooling body, 11... Perforated plate, 14...
...Shaft, 15...Sleeve.

Claims (1)

[Scope of utility model registration request] A cooling body 8 having a perforated plate 11 attached to the side surface is provided at the end of the primary barrel 1 on the vacuum chamber 3 side. A water-cooled sleeve 15 is attached to support the tip of the vacuum chamber 3 side, and cooling water with independently set cooling water temperature and amount can be supplied to the cooling body 8 and the sleeve 15, respectively. A vacuum clay kneading machine that is characterized by: