JPH10296837A - Kneading extruder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a kneading extruder having enhanced kneading performance and durability. SOLUTION: A screw 54 is rotatably disposed in cylinder 52, spiral screw thread ridges 54b are formed on an outer periphery 54a, and the ridges 54b in a predetermined region along a rotary axis direction is cutout. A kneading pin 12 is formed in a columnar state, inserted to a site corresponding to a predetermined region A of the cylinder 52, and partly projected into the cylinder 52. In particular, the pin 12 is inserted so that the both ends are supported and only part of the periphery is projected into the cylinder 52. A rotary drive means 14 rotates the screw 54.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a screw-type kneading extruder having good kneading performance.

[0002]

2. Description of the Related Art FIG. 14 shows a conventional kneading extruder having improved kneading performance. This kneading extruder 50 is
A cylinder 52, rotatably disposed in the cylinder 52,
The screw 54 includes a screw 54 having a spiral screw ridge 54b formed on an outer peripheral surface 54a, and a rotation driving unit (for example, an electric motor) (not shown) for rotating the screw 54.

[0003] A screw 52 is used to control a cylinder 52.
In order to increase the degree of kneading of the material to be kneaded, such as rubber or synthetic resin, which is kneaded and transported inside, the screw ridge 54b in a predetermined area A along the direction of the rotation axis C of the screw 54 is cut out, and In a portion corresponding to the predetermined area A of the cylinder 52, the tip of the cylinder 5 extends along the radial direction of the cylinder 52 from the outside of the cylinder 52 toward the center of the screw 54.
A plurality of kneading pins 58 projecting into the second internal space 56 are inserted. In this example, the predetermined area A is, for example, 4
The kneading pins 58 are provided on each of the predetermined areas A at an interval, for example, eight at an angular interval.
The kneading pin 58 has a male screw (not shown) formed on the outer periphery thereof, and is screwed and attached to a female screw hole 60 provided in the cylinder 52. The kneading pin 58 is formed by changing the screwing amount. By changing the distance between the tip of the pin 58 and the outer peripheral surface 54a of the screw 54, the degree of kneading of the material to be kneaded can be changed.

With this configuration, the flow of the material to be kneaded transported by the rotating screw 54 is disturbed by the kneading pins 58 in the predetermined area A as shown in FIG. 15, thereby increasing the degree of kneading of the material to be kneaded.・ It has an effect. It is also effective for promoting plasticization together with kneading.

[0005]

However, the above-mentioned conventional kneading extruder 50 has the following problems. FIG.
As shown in the figure, the material to be mixed goes around the kneading pin 58 and the inner peripheral surface of the cylinder 52 and the outer peripheral surface 5 of the screw 54.
4a, the degree of kneading is increased, but the kneading pins 58 are formed in cylindrical bodies having substantially the same diameter.
The cross-sectional shape and the cross-sectional area of the kneading pin 58 hardly change from the outer peripheral surface 54a of the screw 54 to the inner peripheral surface of the cylinder 52. Therefore, the transport speed and transport route of the material to be kneaded transported around the kneading pins 58 are substantially the same at different positions along the direction of the inner peripheral surface of the cylinder 52 from the outer peripheral surface 54a of the screw 54, There is a problem that it is difficult to obtain a high kneading effect.

The kneading pin 58 has one end supported by the cylinder 52 and the other end protruding into the cylinder 52. Therefore, the material to be kneaded conveyed to the other end protruding (also referred to as a protruding end). Always receive pressure. In particular, when the viscosity of the material to be kneaded is high, the pressure is large, and depending on long-term use, the protruding end of the material to be kneaded may be bent in the transport direction, and the kneading performance is reduced. Also, with the projecting end of the kneading pin 58 interfering with the screw ridge 54b,
When the screw 5 is accidentally moved in the cylinder 52, the screw
There is also a problem that it is easy to bend by abutting on 4b.

In the kneading extruder 50, since the material to be kneaded adheres to the surface of the screw 54 and the inner peripheral surface of the cylinder 52, it is necessary to periodically pull out the screw 54 from the cylinder 52 and clean them. However, the kneading pins 58
The position of the protruding end of the screw 54 is inserted so as to reach a region between the outer periphery of the screw mountain 54b and the outer peripheral surface 54a of the screw 54 in order to increase the degree of kneading when viewed from the rotation axis direction of the screw 54. Screw 5
When removing 4 from the cylinder 52, all the kneading pins 58 are turned so that the kneading pins 58 do not interfere with the screw ridges 54b, and the tips of the kneading pins 58 are moved to near the inner peripheral surface of the cylinder 52. There is also a problem that it is necessary and it takes a lot of work.

Accordingly, the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a kneading extruder capable of improving the kneading performance and the durability. Another object of the present invention is to provide a kneading extruder capable of easily extracting a screw from a cylinder.

[0009]

To achieve the above object, according to the present invention, the invention according to claim 1 comprises a cylinder,
A screw in which the screw is formed rotatably in the cylinder, a spiral screw ridge is formed on an outer peripheral surface, and the screw ridge is cut out in a predetermined region along a rotation axis direction; It is inserted at the site corresponding to the area,
In a kneading extruder having a column-shaped kneading pin part of which protrudes into a cylinder and a rotation driving means for rotating the screw, the kneading pin is supported at both ends, and only a part of the outer peripheral surface is provided. Are inserted so as to protrude into the cylinder. According to this configuration, the area of the cross section of the kneading pin that the material to be kneaded hits with the circumferential surface around the rotation axis of the screw changes greatly from the outer circumferential surface side of the screw to the inner circumferential surface direction of the cylinder. . For this reason, for example, the amount of the material to be kneaded transported around the outer peripheral surface of the screw is small, while the amount of the material to be kneaded transported near the inner peripheral surface of the cylinder is increased by the kneading pins, and the material to be kneaded becomes large. Changes in the transport route and transport speed of the mixture, and the degree of kneading increases.

Further, in the invention according to claim 2, the kneading pin is rotatably inserted, and a concave portion is formed in a part of an outer peripheral surface which protrudes into the cylinder when rotated. The screw can be moved in the rotation axis direction in the cylinder by rotating the kneading pin so that the concave portion faces the screw side. In this way, the kneading pin is rotatably inserted and a recess is formed in a part of the kneading pin so that the kneading pin does not interfere with the screw ridge, and the kneading pin is rotated. When the outer peripheral surface without the concave portion or the concave portion can be selected, the outer peripheral surface without the concave portion is selected during the kneading operation and protrudes into the cylinder. The screw can be moved so that the screw can be taken in and out easily without pulling out the kneading pins, simply by making a half turn.

When the kneading pin is formed in an arc shape that coincides with the inner wall surface of the cylinder when the kneading pin is rotated so that the recess faces the screw, the inner peripheral surface of the cylinder is formed. The cylinder can be easily cleaned. Further, the kneading pin may be inserted into a portion of the cylinder corresponding to the predetermined region from a plurality of directions around the screw, or the kneading pin may be inserted into the predetermined region itself where the kneading pin is inserted. May be provided along the rotation axis direction of the screw to further increase the degree of kneading.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a kneading extruder according to the present invention will be described below in detail with reference to the accompanying drawings. The same components as those in the conventional example are denoted by the same reference numerals. (First Embodiment) First, a basic configuration of the present embodiment will be described with reference to FIGS. The kneading extruder 10 includes a cylinder 52 having an inner peripheral surface formed in a cylindrical shape.
And the outer peripheral surface 54a is rotatably disposed in the cylinder 52.
A screw 54 having a helical screw ridge 54b formed therein, the screw 54 having the screw ridge 54b cut out in a predetermined area A along the rotation axis C direction, and a predetermined area A of the cylinder 52
The kneading pin 12 has a columnar kneading pin 12 which is inserted into a portion corresponding to the above and partially projects into the cylinder 52, and a rotation driving means 14 for rotating the screw 54. The rotation drive means 14 may be a manual handle as shown in FIG. 1, or may be an electric motor or the like.

As shown in FIG. 2, the feature of the present invention is that the kneading pins 12 extend in the radial direction of the cylinder 52 so that the kneading pins 12 cross the inner space 56 of the cylinder 52 and only a part of the outer peripheral surface crosses the internal space 56. It is a point that is inserted obliquely. As a result, the kneading pins 12 are in a state where at least both ends thereof are supported, and since one end side does not protrude into the cylinder 52 as in the related art, even if pressure is applied from the kneaded material being transported. Further, even when the extruder 10 comes into contact with the screw mountain 54b, the extruder 10
More durable.

Next, the kneading operation by the kneading pins 12 will be described with reference to FIGS. Kneading pins 12
Since a part of the outer peripheral surface protrudes into the cylinder 52,
The material to be kneaded comes into contact with the kneading pins 12 and
This is similar to the kneading pin 12 described in the conventional example in that the transport direction in the inside is changed, and the degree of kneading is higher than when the screw is simply transported in the cylinder 52 by the screw 54.

However, the kneading pin 12 of the present invention differs from the kneading pin 12 of the prior art in that the circumferential surface of the kneading pin 12 centered on the rotation axis C of the screw 54 as shown in FIGS. The area of the cross section D (the hatched portion in FIGS. 3 to 5) by the cylinder 5 from the outer peripheral surface 54a side of the screw 54
2 becomes larger in the direction of the inner peripheral surface 52a. For this reason, for example, the material to be kneaded transported in the vicinity of the outer peripheral surface 54a of the screw 54 (the position of the circumferential surface U) does not directly contact the kneading pins 12 and hardly wraps around (see FIGS. 5 and 9). U indicates the path of the material to be kneaded). The material to be kneaded transported at an intermediate position (the position of the circumferential surface V) between the outer peripheral surface 54a of the screw 54 and the inner peripheral surface 52a of the cylinder 52 is:
Since the area of the cross section D of the kneading pin 12 due to the circumferential surface V is small, the kneading pin 12 is transported while being wrapped around the kneading pin 12 and kneading is performed (v in FIGS. Shows the path of the material). The material to be kneaded transported near the inner peripheral surface 52a of the cylinder 52 (the position of the circumferential surface W) further increases the area of the cross section D of the kneading pin 12 due to the circumferential surface W. The material is transported while being further wrapped around the pin 12, and kneading is performed (w in FIGS. 3 and 9 indicates the path of the material to be kneaded).

As described above, even with one kneading pin 12, the amount of material to be kneaded, that is, the transport route generated by the kneading pin 12 varies depending on the distance from the outer peripheral surface 54a of the screw 54, and the transport speed is accordingly changed. Also change. For this reason, the degree of kneading of the material to be kneaded is further increased. In addition, not only one kneading pin 12 but also FIG.
As shown by the one-dot chain line, a plurality of cylinders 52 (see FIG.
In this case, for example, three), if they are inserted from different directions, the degree of kneading can be further increased. As shown in FIG. 1, a plurality of (three as an example in FIG. 1) predetermined regions A into which the kneading pins 12 are inserted are provided along the direction of the rotation axis C of the screw 54. The degree can be increased.

(Second Embodiment) The configuration of a kneading extruder according to the present embodiment is substantially the same as the configuration of the first embodiment, and only different configurations will be described with reference to FIGS. Will be explained. The same components as those in the first embodiment are denoted by the same reference numerals. As shown in FIG. 6, at least a portion of the kneading pin 12 supported in the cylinder 52 is formed in a columnar shape, and is rotatably inserted into the cylinder 52. When the kneading pin 12 rotates, the cylinder 5
The recess 16 is formed in a part (region E) of the outer peripheral surface protruding into the inside 2. In the present embodiment, the shape of the concave portion 16 is, for example, that the kneading pin 12 is
When rotated to the side, the inner surface is formed in an arc shape coinciding with the inner peripheral surface 52a of the cylinder 52.
The shape of the concave portion 16 is not limited to an arc shape, and may be any shape as long as the kneading pin 12 does not interfere with the screw ridge 54b when the concave portion 16 is rotated so that the concave portion 16 faces the screw 54 side. Alternatively, the inner surface may have a U-shaped cross section.

When the kneading pin 12 has the above-described structure, the kneading material transported in the cylinder 52 when the kneading pin 12 is rotated to project the outer peripheral surface without the concave portion 16 into the internal space 56 of the cylinder 52. Can be kneaded (see FIGS. 6 and 9).
If the screw 54 is to be movable in the direction of the rotation axis C in the cylinder 52, for example, when the screw 54 is to be taken in and out of the cylinder 52, the kneading is performed so that the concave portion 16 faces the screw 54 side. The pin 12 may be rotated about 180 degrees from the state shown in FIG. 6 (see FIGS. 7 and 10). Since only the kneading pins 12 need to be rotated by about 180 degrees as described above, it is not necessary to remove all the kneading pins 58 as in the conventional kneading extruder 50. The cleaning work of the cylinder 54 and the cylinder 52 can be performed easily and efficiently in a short time.

Further, as described above, the shape of the concave portion 16 is formed in an arc shape which coincides with the inner peripheral surface of the cylinder 52 when the concave portion 16 is directed toward the screw 54 as shown in FIGS. Thus, the inner peripheral surface 52a of the cylinder 52 is flattened, and the inside of the cylinder 52 is easily cleaned neatly. Further, for example, as shown in FIGS. 8 and 11, when the concave portion 16 is not completely oriented toward the screw 54, a predetermined region where the kneading pin 12 is inserted from the upstream side in the transport direction of the material to be kneaded. When viewed from the A side, the cross-sectional shape of the flow path between the outer peripheral surface 54a of the screw 54 through which the material to be mixed passes, the inner peripheral surface 52a of the cylinder 52, and the outer peripheral surface of the kneading pin 12 changes, and the cross-sectional area thereof changes. Also changes. Accordingly, the paths u, v, and w passing around the kneading pins 12 of the material to be kneaded passing through the circumferential surfaces U, V, W shown in FIG. 2 are respectively changed, and the degree of kneading of the material to be kneaded is adjusted. Becomes possible.

Next, a specific example of the shape of the kneading pin 12 and the mounting structure to the cylinder 52 described in each of the above embodiments will be described with reference to FIGS. Cylinder 5
An insertion hole 18 for inserting the kneading pin 12 is provided at a portion corresponding to the second predetermined area A, and the inner side communicates with the internal space 16 of the cylinder 52. Also, the insertion hole 18
Is provided with a fixing hole 20 communicating with the insertion hole 18. A female screw is formed on the inner peripheral surface of the fixing hole 20. The kneading pin 12 has a cylindrical outer shape, and a recess 16 is formed in a part (region E) of the outer peripheral surface. In addition, a concave groove 22 is provided on the outer peripheral surface of the intermediate portion. At the end opposite to the end where the recess 16 is provided, a fitting portion 24 is formed for fitting a tool (not shown) for rotating the kneading pin 12 in the insertion hole 18. ing. The fitting portion 24 may be configured to be located in the insertion hole 18 or may be configured to protrude outward from the insertion hole 18.

When the kneading pins 12 are to be inserted into the cylinder 52, the kneading pins 12 are first inserted into the insertion holes 18, and the fixing holes 20 and the concave grooves 22 are positioned. The positional relationship between the concave groove 22 and the region E in which the concave portion 16 is formed is such that the region E on the outer peripheral surface of the kneading pin 12 corresponds to the internal space of the cylinder 52 when the fixing hole 20 and the concave groove 22 are aligned. The position is set to correspond to the position 56. Next, the fixing pin 26 is inserted into the fixing hole 20, and the tip of the fixing pin 26 is engaged with the concave groove 22. This allows
The kneading pin 12 is rotatable in the insertion hole 18 and cannot be removed from the insertion hole 18. Although not shown, a seal member for ensuring airtightness of the internal space 56 is provided between the internal space 56 on the inner surface of the insertion hole 18 and the fixing hole 20. In order to rotate the kneading pin 12 in this state, the above-described tool may be fitted into the fitting portion 24 and turned.

Further, a plurality of kneading pins 12
Is inserted, as shown in FIG.
And the same number of insertion holes 18 as the number of kneading pins 12 to be inserted.
And the kneading pins 12 may be inserted into the respective insertion holes 18. The positions of the insertion holes 18 may be determined so that the kneading pins 12 are inserted from different directions with the screw 54 as a center. Here, in FIG.
Among them, those at the positions of (a) and (c) have the concave portion 16 facing the screw 54, and (b) have the outer peripheral surface where the concave portion 16 is not formed facing the screw 54 side. is there. 12 and 13 illustrate the shape of the kneading pin 12 according to the second embodiment, but the kneading pin 12 according to the first embodiment is rotatably inserted into the cylinder 16. Since it is not necessary, it may have a prismatic or elliptical outer shape instead of the columnar shape. Further, it is not necessary to provide the concave portion 16 on the outer peripheral surface. Therefore, the fitting part 24 is unnecessary.

As described above, various preferred embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments, and many modifications can be made without departing from the spirit of the invention. Of course.

[0024]

In the kneading extruder according to the first aspect of the present invention, the area of the cross section of the kneading pin to which the material to be kneaded is formed by the circumferential surface of the screw centered on the rotation axis of the screw is the outer circumferential surface of the screw. Greatly changes along the inner circumferential surface direction of the cylinder. For this reason, for example, the amount of the material to be kneaded transported around the outer peripheral surface of the screw is small, while the amount of the material to be kneaded transported near the inner peripheral surface of the cylinder is increased by the kneading pins, and the material to be kneaded becomes large. There is an effect that the transport route and the transport speed are changed, and the degree of kneading can be further increased. Further, in the kneading extruder according to the second aspect, the kneading pin is rotatably inserted, and a concave portion is formed in a part of the kneading pin so that the kneading pin does not interfere with the screw mountain. I have. Therefore, by rotating the kneading pin, the outer peripheral surface without the concave portion or the concave portion can be selectively turned to the screw side, and at the time of the kneading operation, the outer peripheral surface without the concave portion is selected and projected into the cylinder, and At the time of screw cleaning, the kneading pin is rotated by 180 degrees so that the concave portion faces the screw side, and the screw can be moved in the cylinder. For this reason, the amount of work for the kneading pins before the screw can be taken in and out is significantly reduced as compared with the conventional one, and there is an effect that the cleaning work of the screw and the like can be performed in a short time.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing the configuration of an embodiment of a kneading extruder according to the present invention.

FIG. 2 is an explanatory view of a predetermined region A of FIG. 1 as viewed from an upstream side in a transport direction of a material to be kneaded.

3 is an explanatory diagram viewed from a side of a cylinder, showing a cross-sectional shape of a kneading pin on a circumferential surface W in FIG. 2 and a wraparound path of a material to be kneaded transported on the circumferential surface W;

4 is an explanatory diagram viewed from the side of a cylinder, showing a cross-sectional shape of a kneading pin on a circumferential surface V in FIG. 2 and a wraparound path of a material to be kneaded transported on the circumferential surface V. FIG.

FIG. 5 is an explanatory diagram showing a cross-sectional shape of a kneading pin on a circumferential surface U in FIG. 2 and a transport path of a material to be kneaded transported on the circumferential surface U, as viewed from a side of a cylinder.

FIG. 6 is an explanatory view of a main part of a configuration of a kneading extruder according to a second embodiment of the present invention (a state in which an outer peripheral surface of a kneading pin without a concave portion faces a screw side).

FIG. 7 is an explanatory view showing a state in which the kneading pin of FIG. 6 is rotated and the concave portion faces the screw side.

FIG. 8 is an explanatory view showing a state in which the kneading pin of FIG. 6 is rotated, and the concave portion does not completely face the screw side.

FIG. 9 is a side view of FIG. 6;

FIG. 10 is a side view of FIG. 7;

FIG. 11 is a side view of FIG. 8;

FIG. 12 is an explanatory view showing a configuration of a kneading pin of the kneading extruder according to the present invention and a configuration of a portion where the kneading pin is inserted into a cylinder.

FIG. 13 is a cross-sectional view taken along the line BB of FIG. 1 showing a state in which a plurality of (for example, three) kneading pins are inserted into a portion corresponding to a predetermined region of the cylinder as an example.

14A and 14B are cross-sectional views of a main part of a cylinder portion showing a configuration of a conventional kneading extruder, wherein FIG. 14A is a side cross-sectional view, and FIG.
It is -B sectional drawing.

15 is an enlarged explanatory view of a main part of a predetermined area A in FIG. 14 for showing a route of a material to be kneaded by a kneading pin.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Kneading extruder 12 Kneading pin 14 Rotation drive means 16 Concave part 52 Cylinder 54 Screw 54a Screw outer peripheral surface 54b Screw mountain A Predetermined area

Claims (5)

[Claims] 1. A cylinder and a screw screw ridge arranged in a freely rotatable manner in the cylinder, a spiral screw ridge formed on an outer peripheral surface, and the screw ridge in a predetermined area along a rotation axis direction is cut out. A screw, a kneading extruder having a columnar kneading pin that is inserted into a portion corresponding to the predetermined region of the cylinder and partially protrudes into the cylinder, and a rotation driving unit for rotating the screw. The kneading extruder is characterized in that both ends of the kneading pin are supported and only a part of the outer peripheral surface is inserted so as to protrude into the cylinder. 2. The kneading pin is rotatably inserted and has a recess formed in a part of an outer peripheral surface that protrudes into the cylinder when the kneading pin is turned, and the screw includes the kneading pin. The kneading extruder is characterized in that the kneading extruder can be moved in the rotation axis direction within the cylinder by rotating the concave portion so that the concave portion faces the screw side. 3. The concave portion is formed in an arc shape that coincides with the inner wall surface of the cylinder when the kneading pin is rotated so that the concave portion faces the screw side. The kneading extruder according to claim 2, wherein 4. The kneading pin is inserted into a portion corresponding to the predetermined region of the cylinder from a plurality of directions around the screw. Kneading extruder. 5. The kneading extruder according to claim 1, wherein a plurality of the predetermined areas are provided along a rotation axis direction of the screw.