JPS593882Y2 - extruder crosshead - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an extruder crosshead.

Generally, in an extruder crosshead, a nipple assembly is fitted on the inlet side of the crosshead body, and a die is fitted or integrally formed on the outlet side of the crosshead body.

In this case, the nipple assembly or die preferably fits into the crosshead body with a precision machined taper to ensure good alignment.

However, in the tapered fitting method, since the contact surface is large, if foreign matter such as dust adheres between the fitting surfaces, the fitting surfaces may be damaged and alignment may become incomplete.

An object of the present invention is to provide an extruder crosshead that can maintain good alignment between the die and the nipple assembly without damaging the fitting surface even if foreign matter enters between the taper fitting surfaces. It is in.

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an extruder crosshead 10 according to the present invention, and this crosshead 10 is connected to a breaker plate provided at the outlet of an extruder body 12. The crosshead body 18 includes a crosshead body 18 having resin passages 16 aligned with the extruder body 12 with screws 20. From the movable body 24 to be inserted, the resin passage 16 radially passes through these bodies 22.24, and the protrusion 24a of the movable body is formed on the bottom surface of the end longitudinal groove 22a of the fixed body. When engaged, the resin passageways 16 are aligned between the bodies 22,24.

The movable body 24 has a nipple assembly 26 inside it on its inlet side.
has a tapered inner surface 24b that fits within the tapered inner surface 24b, and the die 28, in the illustrated embodiment, is aligned with a nipple assembly that is integrally formed with the movable body 24 and that fits into the tapered inner surface 24b.

The end flange 26a of the nipple assembly 26 is fixed to the end surface of the movable body 24 with screws 30.

The molten resin inside the extruder main body 12 passes through the breaker plate 14
and through the resin passage 16, through the resin passage 32 between the inner surface of the movable body 24 of the crosshead body 18 and the outer surface of the nipple assembly 26, and through the nipple assembly into the die 2.
A resin coating is extruded onto the core material 34 emerging from 8.

In addition, the reference numeral 38 in the figure indicates the fixed body 2 of the crosshead body 18.
This is a heater installed around 2.

The extruder crosshead of the present invention has a crosshead main body 18
The fitting surface between the tapered inner surface 24b of the movable body 24 and the outer surface of the nipple assembly 26 has a large number of notches 3B spaced apart in the circumferential direction, for example.

In the embodiment shown in FIGS. 1 and 2, this notch is cut out from the vertical groove 40 provided in the tapered inner surface 24b of the movable body 24, but as shown in FIG. It may be cut out from the vertical groove 42 provided on the outer surface.

These longitudinal grooves must be provided in the area of the mating surfaces of movable body 24 and nipple assembly 26 to prevent resin in resin passageway 32 from entering.

In this way, if the fitting surface between the movable body 24 and the nipple assembly 26 has a large number of vertical grooves 40 or 42 spaced apart in the circumferential direction, the nipple assembly 26 can be turned only by the distance between the vertical grooves. Foreign matter such as dirt adhering to the mating surfaces can be allowed to fall into the vertical grooves, so these tapered mating surfaces are not damaged, and the nipple assembly 26 can be moved into the movable body 24.
and can be aligned with die 2B.

In FIGS. 4 and 5, the die 28 is the crosshead body 18.
The tapered inner surface 2 of this movable body is separate from the movable body 24 of
4c, and in this case, a similar number of notches 44 are provided between the fitting surfaces of the movable body 24 and the die 28, and these notches are similar to those of the illustrated embodiment. In this example, the vertical groove 46 provided on the tapered inner surface 24C is used as a guide, but it is of course possible to use the vertical groove provided on the die 2B side.

In this embodiment as well, the tapered fitting surfaces of the nipple assembly 26 and the die 28 and the movable body 24 are not damaged and are aligned.

In the above two embodiments, the crosshead main body consists of the fixed main body 22 and the movable main body 24, but these may be integrated.

According to the present invention, as described above, since a large number of vertical grooves are provided at intervals in the circumferential direction between the tapered fitting surfaces of the crosshead body and the nipple assembly or the die, these tapered fitting Foreign matter such as dirt adhering to the mating surface will fall into the vertical groove due to the slight relative rotation between the crosshead body and the nipple assembly or die, so the taper mating surface will not be damaged, and this foreign matter will not be damaged. This does not hinder the alignment of the nipple assembly or the die with respect to the crosshead body, and therefore, it is possible to obtain a high-quality extruded coating without uneven thickness.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of an embodiment of the extruder crosshead according to the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig. 3 is a modification of Fig. 1 and Fig. 2. FIG. 4 is a vertical sectional view of another embodiment of the present invention; FIG.
The figure is a sectional view taken along the line BB in FIG. 4. 10... Extruder cross head, 12...
・Extruder main body, 16...Resin passage, 18...
...Crosshead body, 26...Nipple assembly, 28...Dice, 38.44...
・Notch, 40.42.4t...Vertical groove.

Claims (5)

[Scope of utility model registration request] (1) In an extruder crosshead in which a nipple assembly provided on the inlet side of the crosshead body and a die provided on the outlet side are used together, the nipple assembly or the die is tapered fitted to the crosshead body. , a plurality of vertical grooves are provided at intervals in the circumferential direction between the nipple assembly or the die tapered fitted to the crosshead body and the tapered fitting surface of the crosshead body. Extruder crosshead. (2) The extruder crosshead according to claim 1, wherein the longitudinal groove is provided on the inner surface of the crosshead main body. (3) The extruder crosshead according to claim 1, wherein the longitudinal groove is provided on the outer surface of the nipple assembly or the die. (4) The die is integral with the crosshead body, and the longitudinal groove is provided only between the nipple assembly and the crosshead body. Scope of Utility Model Registration Claims 1 and 2 or the extruder crosshead according to item 3. (5) Both the nipple assembly and the die are tapered fitted to the crosshead body, and the longitudinal groove is provided between both the nipple assembly and the die and the crosshead body. An extruder crosshead according to claim 1, 2, or 3 of the utility model registration claims.