JPH0348009B2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention is applicable to, for example, extrusion of synthetic resins and rubber,
This invention relates to a kneading machine used for injection molding or kneading edible dough products.

(B) Prior Art The above-mentioned kneading machine uses various types of screws having specially shaped kneading sections. For example, the barrier type screw 15 shown in FIG. 5 (US Pat. No. 3,486,192) A kneading part 15b having the same diameter as the flight diameter is formed in the center of the shaft 15a, and a plurality of kneading grooves 15c are formed in the axial direction on the outer peripheral surface of this kneading part 15b. When using the screw shaft 15a, the raw material flowing into the kneading grooves 15c is transferred in the axial direction by the rotation of the screw shaft 15a, and at the same time, a part of the raw material is transferred to the screw shaft 1.
Since it only flows out in the direction opposite to the rotation of 5a and flows into the next stage kneading groove 15c in the circumferential direction,
There is a problem in that only turbulent flow occurs in the kneading section 15b due to flow in two directions, making it difficult to knead raw materials and additives in a uniform ratio.

In addition, as another example, Figure 6
In this case, a main flight 16b and a sub-flight 16c with a large pitch width are formed on the screw shaft 16a, and both flights 16b, 16 are arranged in the transfer direction.
Since the kneading section 16d is formed with a narrow interval c, the raw material passes over the sub-flight 16b by the rotation of the screw shaft 16a,
The raw material flowing on the back side of c is mixed with the raw material, but this raw material is not continuously mixed or kneaded and is only stirred by both flights 16b and 16c, so the raw material and addition There was a problem in that it was difficult to mix the ingredients in a complicated manner and knead them in a uniform ratio.

(C) Purpose of the Invention This invention provides a method for forming multi-row kneading grooves formed in a spiral shape.
By alternately varying the groove depth and groove width in the spiral direction, the shallow groove narrow part and the deep groove wide part are formed.
A complex turbulent flow is continuously generated in the kneading section by the dispersion effect of the kneading grooves and the stirring effect of the spiral shape, making it possible to knead raw materials such as synthetic resins and paste foods in a uniform ratio. The purpose is to provide machines.

(d) Structure of the Invention The present invention is a kneading machine in which a screw shaft is rotatably inserted into a heating cylinder having a raw material input port at one end and a raw material extrusion port at the other end, The groove is formed by carving a spiral multi-row kneading groove on the outer peripheral surface of the shaft, and each of the above-mentioned kneading grooves is formed by alternating the groove width into a narrow groove part and a wide groove part in the spiral direction. In addition, the kneading machine is characterized in that the narrow groove portion is formed to be shallow and the wide groove portion is formed to be deep.

(e) Effects of the Invention According to this invention, the kneading groove has a multi-strip structure in which shallow groove narrow portions and deep groove widened portions are alternately formed, so that the deep groove widened portions are not covered. The flow cross-sectional area of the kneaded material becomes large, and the flow cross-sectional area of the kneaded material becomes small in the shallow and narrow groove parts, resulting in a structure in which each part with a different flow cross-sectional area is formed continuously in the spiral direction. .

Therefore, when the raw material transferred from the raw material transfer start end side of the kneading section to the widened groove section of the same kneading section is transferred from the widened groove section with a large flow cross section to the narrow groove section with a small flow cross section, it is sequentially transferred. As high pressure is applied, the transfer speed increases sequentially.

As a result, some of the raw material is pressed by the following raw material from the widened groove part and passes through the narrowed part of the groove, and some of the raw material flows back from the high pressure narrow part of the groove to the low pressure widened part, and some of the raw material The mixture crosses over the part corresponding to the flight land between the multi-rows and flows into other adjacent kneading grooves.

Furthermore, when the raw material is transferred from the narrow groove section to the next wide groove section, the high pressure is sequentially released and the transfer speed is sequentially reduced.

As a result, the raw material that has passed over the portion corresponding to the flight land from another adjacent kneading groove flows into the raw material that is pressed by the subsequent raw material and flows through the widened groove portion.

These various kneading actions are repeated from the raw material transfer start end to the raw material transfer end of the kneading section, so
This has the effect of ensuring that the raw materials are kneaded into a uniform state.

(F) Embodiment of the Invention An embodiment of the invention will be described in detail below based on the drawings.

The drawings show a multi-shaft kneading machine, and in FIGS. 1 and 2, this kneading machine 1 has a housing 3 fixed on a machine stand 2, and a heating cylinder 4 horizontally suspended inside this housing 3. Along with this heating cylinder 4
There are three screw shafts 5a that rotate synchronously inside the
5b and 5c are installed together.

The above-mentioned heating cylinder 4 has a raw material inlet 4a on the upper surface of the raw material transfer starting end and a raw material extrusion port 4b on the raw material transfer terminal end. The hopper 6 is fixed at a position communicating with the heating cylinder 4, and a plurality of band heaters 7...
are fixed at equal intervals.

Each of the above-mentioned screw shafts 5a, 5b, 5c has a second
As shown in the figure, a gear groove 8 for crushing the raw material is formed at the starting end on the side of the raw material input port 4a, a kneading section 9 for kneading the raw material is formed at the center, and a gear groove 8 is formed at the starting end on the raw material input port 4a side. Flightland 10 for transferring raw materials
Three screw shafts 5a, 5 of substantially the same shape forming
b, 5c.

Each of the above-mentioned screw shafts 5a, 5b, and 5c has a screw shaft 5a pivotally supported in the center, and this screw shaft 5a
Screw shafts 5b and 5c are pivotally supported at both sides of the screw shaft 5a, and a drive motor (not shown) is connected to the base end of the central screw shaft 5a, and rotation of this drive motor moves the screw shaft 5a in the extrusion direction (the 2), and at the same time, each screw shaft 5a, 5
The screw shafts 5b, 5c on both sides are synchronously rotated in opposite directions by the engagement of the gear grooves 8 formed at the base ends of the screws 5b, 5c.

Here, the above-mentioned screw shafts 5b and 5c on both sides
is formed in a spiral in the opposite direction to the central screw shaft 5a.

As shown in FIG. 2, the above-mentioned kneading section 9 has a kneading section 9 having the same diameter as the diameter of the fried land 10, and has multiple kneading grooves, for example, 12 kneading grooves, on the outer peripheral surface of the kneading section 9. 9a... is formed in a spiral shape, and this kneading groove 9
The groove ridges 9b, 9b on both sides of a are bent alternately inside and outside in the helical direction to alternately form narrow groove parts 9c and wide groove parts 9d in the spiral direction, and furthermore, the wide groove parts 9d are bent in the circumferential direction. (in the vertical direction in the drawing of FIG. 2), and as shown in FIG.
The groove is formed shallow in the groove c, and the groove is deep in the enlarged groove part 9d.

In addition, each of the above-mentioned screw shafts 5a, 5b, 5c
As shown in FIG. 3, the central screw shaft 5a
The screw shafts 5 on both sides are inserted into the kneading grooves 9a formed in the
The groove crests 9b of the kneading grooves 9a formed in the grooves b and 5c are engaged with each other.

As shown in FIG. 3, the above-mentioned heating cylinder 4 has an upper cylinder 4d connected to a lower cylinder 4c so as to be openable and closable with a hinge 11, and the other is connected with a bolt 12,
It is fixed with nut 13.

When kneading raw materials such as synthetic resins or edible dough products and additives using the kneading machine 1 configured as described above, the raw materials and additives are mixed in a predetermined ratio in advance and are charged into the hopper 6. At the same time, a drive motor (not shown) is driven to drive each screw shaft 5a, 5b,
When 5c is rotated in the extrusion direction (in the direction of the arrow in Fig. 2), the raw material and additives are separated directly below the hopper 6 by the meshing of the gear grooves 8 formed at the base end of each screw shaft 5a, 5b, 5c. The raw materials and additives are transported to each kneading section 9 while being finely pulverized.

Here, the above-mentioned kneading section 9 has a shallow groove narrow section 9c.
A kneading groove 9 in which deep groove enlarged portions 9d are alternately formed.
Since the multi-strip structure is made with a..., the groove widening part 9d is deep.
In this case, the flow cross-sectional area of the raw material is large, and in the shallow groove narrow part 9c, the flow cross-sectional area of the raw material is small, and in this way, the parts 9d and 9c with different flow cross-sectional areas are formed continuously in the spiral direction. It has a structure.

Therefore, the raw material transferred from the raw material transfer start end side (right side in the drawing) to the widened groove section 9d of the kneading section 9 is transferred from the widened groove section 9d with a large flow cross section to the wide groove section 9d with a small flow cross section. When being transferred to the narrow groove portion 9c, a high pressure is sequentially applied and the transfer speed is sequentially increased.

As a result, some of the raw material is pressed by the following raw material from the wide groove part 9d and passes through the narrow groove part 9c, and some of the raw material flows back from the high pressure narrow groove part 9c to the low pressure wide groove part 9b. A part of the raw material passes over the groove crest 9b corresponding to the flight land between the multi-rows and flows into another adjacent kneading groove 9a.

Moreover, when the raw material is transferred from the narrow groove part 9c to the next wide groove part 9d, the high pressure is sequentially released, and
The transfer speed becomes smaller sequentially.

As a result, the groove enlarged portion 9d is pressed by the subsequent raw material.
Another kneading groove 9a adjacent to the raw material flowing through the
From there, the raw material that has climbed over the groove mountain 9b corresponding to the flight land flows in.

Since such various kneading actions are repeated from the raw material transfer start end to the raw material transfer end end of the kneading section 9, there is an effect that the raw materials can be reliably kneaded into a uniform state.

After this, at the end of each kneading section 9, the additives are extruded into the raw material in a uniformly mixed and kneaded state,
Further, while being heated and melted by the band heaters 7..., the material is extruded from the raw material extrusion port 4b by the rotating action of the flight land 10 at the tip.

In this way, in the kneading section 9, the various kneading actions described above are repeated over the entire length of the kneading section 9, so that the raw materials and additives can be reliably kneaded in a uniform ratio.

In addition, in the above-mentioned embodiment, three screw shafts 5 are used.
The kneading machine 1 has been described in which the kneading sections 9 are formed in each of the kneading sections 9, 5b, and 5c.
The same effect can be obtained even if the multi-row kneading grooves 9a are configured, and the number of multi-row kneading grooves 9a may be other than the 12 grooves shown in the embodiment, such as 4 grooves or 5 grooves.

FIG. 4 shows another embodiment of the kneading section 9. In the previous embodiment, the widened groove portion 9d was formed wide in the circumferential direction, but in this embodiment, the widened groove portion 9d of the kneading groove 9a is
The kneading section 9 is formed to be wide in the axial direction (horizontal direction in the drawing of FIG. 4).

Even with this configuration, the same operation and effect as in the previous embodiment is achieved. Therefore, in FIG. 4, the same parts as those in FIG. do.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional side view of a kneading machine, FIG. 2 is an enlarged plan view of the kneading section of FIG. 1, FIG. 3 is a longitudinal sectional view of the kneading section, The figure is an enlarged side view showing another embodiment of the kneading section, FIG. 5 is a side view showing a conventional screw shaft structure, and FIG. 6 is a side view showing a conventional screw shaft structure. 1... Kneading machine, 4... Heating cylinder, 4a... Raw material inlet, 4b... Raw material extrusion port, 5a, 5b, 5c... Screw shaft, 9... Kneading section, 9a... Kneading groove, 9c... Groove narrow part, 9d... Groove Expansion.

Claims (1)

[Scope of Claims] 1. A kneading machine in which a screw shaft is rotatably inserted into a heating cylinder 4 having a raw material input port 4a at one end and a raw material extrusion port 4b at the other end, the kneading machine using the screw shaft. The section 9 is formed by carving a spiral multi-row kneading groove 9a on the outer circumferential surface of the shaft, and each of the kneading grooves 9a has a narrow groove part 9c and a wide groove part 9d in the spiral direction.
A kneading machine in which the groove width is alternately varied, and the narrow groove part 9c is formed to be shallow, and the wide groove part 9d is formed to be deep.