JPS6114411Y2 - - Google Patents

Description

[Detailed description of the invention] This invention has two connecting pipes that can absorb thermal expansion.
This relates to a stage extruder.

In order to obtain high performance plastic materials, low temperature extrusion moldability, high kneading properties, etc., two extruders, a first stage extruder 1 and a second stage extruder 2, are connected in series via a connecting pipe 3. Connected two-stage extruders are conventionally used. FIG. 1 shows one row of a conventional two-stage extruder.

Now, if each of the first and second stage extruders 1 and 2 is fixed and installed on the ground, excessive force will be applied to the connecting pipe 3 due to thermal expansion of the extruders 1 and 2, causing damage to the connecting pipe 3. However, there was a drawback that the cylinder was curved and the screw scraped against the inner wall of the cylinder.

That is, due to the thermal expansion of the first stage extruder 1 and the connecting pipe 3, for example, when the second stage extruder 2 is loosely fixed to the ground, the cylinder of the second stage extruder 2 is bent in the direction of arrow a. If the screw and cylinder of the extruder come into metal contact and galling occurs, and conversely, if the first stage extruder 1 is loosely fixed, the first stage extruder 1 will curve in the direction of arrow b in the same way as above, The problem was that galling occurred in the screw and cylinder.

In order to prevent these drawbacks, it has been proposed that the first stage extruder 1 be placed on a cart or rollers that moves it smoothly, but in this case, the processing and assembly of the cart and rollers is difficult. It also had the drawbacks of being difficult and expensive to install.

The present invention was proposed to solve the above-mentioned conventional drawbacks, and includes a first-stage extruder and a second-stage extruder that are fixed to the ground and extend in parallel to each other in the same direction.
A straight pipe connected to the tip of the stage extruder so as to extend in the same direction as this, another straight pipe connected orthogonally to the second stage extruder, and a straight pipe connected to each of the straight pipes through a joint, respectively. By constructing the extruder with two straight tubes connected at right angles to each other, the thermal expansion of each extruder can be absorbed by the connecting tube, eliminating defects such as galling of the screw and cylinder. It is intended to provide a two-stage extruder.

Embodiments of the present invention will be explained below with reference to the drawings. Figure 2 shows a plan view of a two-stage extruder in which a first-stage extruder 1 and a second-stage extruder 2, each fixed on the ground, are connected by a connecting pipe 4. As shown in the figure, the connecting pipe 4 has a bent piping structure.

That is, in FIG. 4, the connecting pipe 4 has a structure in which straight pipes 5, 6, 7, and 8 are connected using elbow joints 9, 10, and 11, and first, it extends in the same direction as the first stage extruder 1. A straight pipe 6 is connected to the straight pipe 5 at right angles by an elbow joint 9. Further, a straight pipe 7 extending from the straight pipe 6 in parallel to the straight pipe 5 in the folding direction is connected by an elbow joint 10, and furthermore, the straight pipe 7 is connected by an elbow joint 10.
A straight pipe 8 extending perpendicularly from the extruder 1 in a direction away from the first stage extruder 1 is connected by an elbow joint 11 . The other end of the straight tube 8 is connected to the second stage extruder 2 via a flange 12. The bent tube structure of the connecting tube 4 shown in FIG. 4 is an example, and the present invention is not limited to this structure.

Further, the lower part of the elbow joint 10 is supported by a stand 13 as shown in FIG. The stand 13 is fixed to the ground, and a height adjustment bolt 14 is attached to the top of the stand 13.
are screwed together, and the upper end of the bolt 14 is in contact with a receiving member 15 that is integral with the elbow joint 10. Note that the stand may be installed at multiple locations instead of at one location.

Next, to explain the operation, as shown in Fig. 2, as the two-stage extruder is operated, the temperature of the first-stage extruder 1, the connecting pipe 4, and the second-stage extruder 2 gradually rises and thermally expands. . When the extruders 1 and 2 fixedly installed on the main surface via the stand 13 expand thermally, the center line A (dotted chain line) of the connecting tube 4 changes as shown by B (double dot chain line) due to the thermal expansion. By moving, the thermal expansion of the first and second stage extruders 1 and 2 can be released. In addition, each arrow in FIG. 4 is an enlarged and proportional display of the amount of horizontal deflection at the bending point of the connecting pipe 4 and the joint part of each extruder 1, 2. The numbers shown along the line indicate actual values in mm of a 115φ/150φ two-stage extruder.

As explained in detail above, the present invention has a first-stage extruder and a second-stage extruder that are fixed to the ground and extend in parallel to each other in the same direction, and a second-stage extruder that extends in the same direction as the first-stage extruder at the tip of the first-stage extruder. Straight pipes connected like this,
Another straight pipe was connected perpendicularly to the second stage extruder, and two straight pipes were connected to each straight pipe at right angles to each other through joints, so that the first Even if the second-stage extruder expands thermally, the amount of expansion can be absorbed by the connecting tube, which is composed of a straight tube and a joint, minimizing the actual amount of deflection of each extruder. Accidents such as the screw coming into contact with the inner wall of the cylinder and scratching it can be avoided, and since no carts or rollers are used, processing, assembly, and installation can be facilitated. In addition, the present invention has a bent tube structure with a connecting structure of a straight tube and a joint, so even if the first and second stage extruders are arranged out of parallel, it is easy to bend the tube to accommodate this. It can be a tubular structure.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of a conventional two-stage extruder, FIG. 2 is a plan view of a two-stage extruder showing an embodiment of the present invention, and FIG. 3 is a view taken in the direction of the X arrow in FIG. FIG. 4 is an enlarged plan sectional view of the Y section in FIG. 2. Explanation of main parts of the figure, 1...first stage extruder, 2
...Second stage extruder, 4...Connection pipe, 5, 6, 7,
8...Straight pipe, 9, 10, 11...Elbow joint.

Claims (1)

[Scope of utility model registration request] a first-stage extruder and a second-stage extruder fixed to the ground and extending in parallel to each other in the same direction; a straight pipe connected to the tip of the first-stage extruder so as to extend in the same direction; Another straight pipe is connected orthogonally to the stage extruder, and two straight pipes are connected to each other at right angles to each other through joints.
2 characterized by being more like a straight tube
Stage extruder.