JP4666559B2 - Extruder and head assembly structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an assembly structure of an extruder and a head using a head spacer that is inserted between an extruder such as rubber and a head and enables the size of the extruder to be changed.
[0002]
[Prior art]
In the case of conventional extruders, for example, when the size is increased to improve the extrusion capability, it is necessary to newly install or modify a head, a die holder (preformer), or a die (die) in accordance therewith.
[0003]
[Problems to be solved by the invention]
However, when a head or the like is newly installed or remodeled, enormous costs, man-hours, periods, and the like are required, resulting in problems in economy and productivity.
[0004]
Therefore, the present invention enables the head used so far to be used as it is even when the size of the extruder is increased, so as not to cause deterioration in economic efficiency, productivity, and the like. It is intended.
[0005]
[Means for Solving the Problems]
The present invention has been made to solve the above problems, the gist of which is a counterbore formed around an opening of an extrusion screw cylinder of an extruder, and fitted into the counterbore, A ring-shaped head spacer having a circular hole having the same inner diameter as the inner diameter of the opening, an annular convex portion formed around the inlet of the head having an inner diameter smaller than the opening, and the head spacer. An assembly structure of an extruder and a head having an annular recess that fits with the annular protrusion, and a tapered surface that is formed in the head spacer and connects the inner periphery of the opening and the inner periphery of the annular protrusion. It is concerned.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a head spacer 1 of the present invention. The head spacer 1 is a ring type, and is inserted between the extruder 2 and the head 3 as shown in FIG.
[0008]
Here, the inner surface of the ring of the head spacer 1 is a tapered surface 1A, and the inner diameter φA on the extruder side and the inner diameter φB on the head side are different. Therefore, as shown in FIG. 1, even if the inner diameter is different between the extruder side and the head side, the difference in diameter can be absorbed.
[0009]
That is, conventionally, the extruder 2 and the head 3 are directly attached. For this reason, when the size of the extruder 2 is changed, the diameter of the head 3 is not matched, and it is necessary to newly install or modify the head according to the size of the new extruder. If it is inserted, the head used so far can be used as it is. In addition, a die holder (preformer) and die (die) used for molding can be used as they are.
[0010]
In this case, rubber detachability based on the difference in diameter becomes a problem. However, as described above, the inner surface of the ring is the tapered surface 1A in the head spacer 1 of the present invention. Therefore, it is possible to increase the size of the extruder while ensuring rubber removal.
[0011]
The head spacer 1 of the present invention can be changed in size of the extruder regardless of whether it is a hot type or a cold type. For example, in the case of the hot type, in order to attach an extruder having a size increased from φ200 to φ250 (φ200HOT to φ250HOT) to a multilayer extrusion head having an opening size of φ200, the inner diameter of one end surface is φ250 and the inner diameter of the other end surface is φ200. A head spacer may be used, and the extruder side may be set at φ250 and the head side at φ200 and installed between the extruder and the head. Also, in the case of the cold type, in order to install an extruder that is increased in size from φ120 to φ150 (φ120PCT to φ150PCT) on a flat head with an opening size of φ120, as with the hot type, install a suitable head spacer. Good.
[0012]
FIG. 2 is a partial cross-sectional view showing an example in which the head spacer 1 of the present invention is attached to form a hot facing type. That is, without increasing the size of the head or remodeling, the head 3 that has been used so far is used as it is, and the size of the extruder 2 is increased by interposing the head spacer 1.
[0013]
FIG. 3 is a cross-sectional view showing the extruder 4 of the present invention. As shown in FIG. 3, a ring-type head spacer 1 is attached to the end of the extrusion screw cylinder 4 </ b> A of the extruder 4.
[0014]
That is, the extruder 4 is configured by attaching the head spacer 1 having an inner diameter φA on one end surface side that matches the inner diameter of the end of the extrusion screw cylinder 4A. Since the inner surface of the ring of the head spacer 1 is a tapered surface 1A, the inner diameter φB of the other end surface is always set regardless of the inner diameter of the end of the extruded screw cylinder 4A by changing the width and taper angle of the spacer. It can be made constant. Therefore, if the inner diameter φB of the other end surface is set in accordance with the head having a certain opening size, the extruder 4 can be attached to the head as it is.
[0015]
As described above, the head spacer 1 of the present invention and the extruder 4 having the head spacer can be easily improved in capacity by simply replacing the extruder without changing the head, and no change of the base or the like or jigs and tools are required. In addition, when the size of the extruder was increased by using the head spacer 1 of the present invention, in the case of die extrusion, φ200HOT was changed to φ250HOT, thereby improving the discharge amount by 30% while ensuring rubber removal. I was able to. In the case of hot-insertion extrusion, the discharge amount could be improved by 100% by changing φ120PCT to φ150PCT.
[0016]
【The invention's effect】
According to the extruder and head assembly structure of the present invention, the inner surface of the ring-type head spacer is a tapered surface, so even if the size of the extruder is changed, a new head can be installed or modified The head that has been used so far can be used as it is.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a head spacer 1 of the present invention.
FIG. 2 is a partial cross-sectional view showing an example of a hot facing type with the head spacer 1 of the present invention attached.
FIG. 3 is a cross-sectional view showing an extruder 4 of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Head spacer 1A ... Tapered surface 2 ... Extruder 3 ... Head 4 ... Extruder 4A ... Extrusion screw cylinder

Claims (1)

Counterbore formed around the opening of the extrusion screw cylinder of the extruder,
A ring-type head spacer that fits into the counterbore and has a circular hole with the same inner diameter as the inner diameter of the opening,
An annular projection formed around the inlet of the head having an inner diameter smaller than the opening;
An annular recess formed in the head spacer and fitted with the annular projection;
A tapered surface formed on the head spacer and connecting the inner periphery of the opening and the inner periphery of the annular protrusion;
An assembly structure of an extruder and a head.

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