JPH0625304Y2 - Extruder for small diameter products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a small-diameter product extruder suitable for extrusion-molding a relatively small-diameter ceramic product having an outer diameter of 100 mm or less.

(Prior Art) When manufacturing a cylindrical ceramic product such as a hollow insulator or a solid insulator, an extruder having a screw for extrusion is widely used. There are various types of extruder drums of various sizes. For example, an extruder having an extruder drum with an inner diameter of about 300 mm is used, and the outer diameter is 100 mm by squeezing the tip of the extruder drum into a tapered shape. Even when trying to extrude the following small-diameter products, the soil flowing in the extrusion drum does not smoothly flow into the small-diameter die, and the internal pressure of the extrusion drum increases and high heat is generated, It was burnt and could not be extruded. Therefore, the outer diameter is 100 mm
For extruding the following small-diameter products, a dedicated machine for extruding small-diameter products must be manufactured and used, and there is a problem that an extruder for general products cannot be used.

(Problems to be Solved by the Invention) The present invention solves such conventional problems and enables a thin product to be smoothly extrusion-molded without reducing the diameter of the extrusion drum. It was completed for the purpose of extrusion of diameter products.

(Means for Solving the Problems) The present invention, which has been made to solve the above problems, is an extruder in which an extruding drum is provided with a mouthpiece having a cylinder at the center of a flange plate. A taper portion and a cylindrical small-diameter portion are provided at the tip end of the, and the inner end of the cylinder is made to project inwardly of the flange plate so as to reach near the extension surface of the taper portion. To do.

(Example) Hereinafter, the present invention will be described in more detail with reference to the illustrated embodiment.

In FIG. 1, (1) is a primary shaft, (2) is a vacuum chamber for deaerating air and the like from the inside of the soil extruded by the primary shaft (1), (3) is inside the vacuum chamber (2) A secondary shaft for extruding the soil that has fallen into the ground, (4) is an extrusion drum. In the embodiment, the extrusion drum (4) has an inner diameter of 300 mm and a length of 620 mm.
A taper part (5) and a cylindrical small diameter part (6) following the taper part (5) are connected to the tip of the extrusion drum (4), and its tip surface (7) is as shown in FIG. The base (8) is attached by bolts.

This base (8) is a vertical flange plate (9) with a cylinder (10) having an inner diameter corresponding to the outer diameter of a small-diameter product, and the inner end (11) of this cylinder (10). Unlike the conventional one, the) is projected more inward than the flange plate (9). The amount of protrusion to the inside may be about 30 to 100 mm when the inner diameter of the cylinder (10) is within the range of 15 to 90 mm.
The taper part (5) of (4) shall be reached near the extension surface. The cylinder (10) is also projected to the outside, but it is sufficient that the projection amount is about 15 mm.
The inner end (11) of the cylinder (10) is 45 ° with respect to its central axis.
It is preferable to be chamfered to some extent.

(Operation) In the extruder of the present invention configured as above, when the soil is pushed into the inside of the extrusion drum (4) by the secondary shaft (3), the soil is squeezed by the taper portion (5) to form a cylinder. Flows into the small-diameter portion (6). At this time, the cylinder (1
The inner end (11) of (0) is projected more inward than the flange plate (9) of the mouthpiece (8) so that it reaches near the extension surface of the tapered part (5), so that part of the soil Plate (9) and narrow section (6)
It enters into the portion surrounded by the outer peripheral surface of the cylinder (10) and forms a dead zone (12) conceptually shown in FIG. As a result, the soil that is subsequently extruded by the secondary shaft (3) smoothly flows into the inside of the cylinder (10) along the tapered boundary surface of the dead zone (12), and A rod-shaped body having an outer diameter corresponding to the inner diameter is extruded from the outer end of the cylinder (10). Thus, according to the present invention, the outer diameter is
Products with a diameter of 100 mm or less can be extruded smoothly, and the soil flow is smooth, so the pressure and temperature inside the extrusion drum (4) will not rise abnormally, and the soil will seize. There is no fear.

Although the embodiment described above is for molding a solid thin product, as shown in FIG.
If a sink with an inner diameter mouthpiece (14) attached to the tip of is attached so that the tip reaches the inside of the cylinder (11), the inner diameter mouthpiece
Extrusion molding of hollow products with an inner diameter corresponding to (14) is possible. In this case, the flow of the sink is prevented by the uniform flow of soil due to the cylinder (10) being extended inward, and an accurate hollow portion can be formed at the center of the product.

(Effect of the Invention) As described above, the present invention allows the soil to smoothly flow into the cylinder by causing the inner end of the cylinder of the mouthpiece to project inward so as to reach the vicinity of the extension surface of the tapered portion. Even if the diameter of the extrusion drum is 300 mm and the outer diameter of the product is 15 to 90 mm, it is possible to extrude small-diameter products without causing dribbling such as baking of soil. . Therefore, according to the present invention, it is possible to extrude a small-diameter product having an outer diameter of 100 mm or less by exchanging only the die of the same extruder as that used for extrusion of general products. You can save time. Therefore, the present invention is an extruder for small-diameter products that eliminates the conventional problems.
Its practical value is extremely large.

[Brief description of drawings]

1 is a partially cutaway front view showing an embodiment of the present invention, FIG. 2 is a partially cutaway perspective view showing the mouthpiece thereof, and FIG. 3 is a sectional view schematically showing the flow of soil at the mouthpiece portion. FIG. 4 is a partially cutaway perspective view of a die part showing a state in which a hollow product is extrusion-molded. (4): Extrusion drum, (5): Tapered part, (6): Cylindrical small diameter part, (7): Tip surface, (8): Base, (9): Flange plate, (1
0): cylinder, (11): inner end.

Claims (1)

[Scope of utility model registration request] 1. A flange plate on the tip surface (7) of the extrusion drum (4).
In an extruder equipped with a mouthpiece (8) provided with a cylinder (10) in the center of (9), a taper portion (5) and a cylindrical small-diameter portion (6) are provided at the tip of the extrusion drum (4). The inner end (11) of the cylinder (10) is projected further inward than the flange plate (9) so as to reach near the extension surface of the tapered portion (5). Diameter product extruder.