JP3867974B2 - Split-type rotor of screw kneading extruder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotor used in a screw-type kneading extruder, and more particularly, to a split-type rotor configured by sequentially fitting and fixing a plurality of screw pieces on the outer periphery of a rotating shaft in the axial direction. .
[0002]
[Prior art]
In a screw-type kneading extruder, a material is kneaded and extruded by rotating a rotor having a screw formed on the outer periphery. In that case, as the rotor, those of various screw shapes are used depending on the characteristics of the kneading material, kneading conditions, and the like. Therefore, the rotor is divided into a rotating shaft that is rotated by a motor and a screw piece that is fitted to the outer periphery of the rotating shaft, and various screw-shaped screw pieces are prepared, and the rotor is It has been made possible to change the screw shape suitable for the kneaded material.
[0003]
In such a divided rotor, conventionally, involute splines are formed on the outer peripheral surface of the rotating shaft and the outer periphery of the shaft hole provided at the center of the screw piece, or the rotating shaft is formed in a regular hexagonal cross section and the screw. The axial holes of the pieces were also regular hexagons so that they were fitted.
[0004]
[Problems to be solved by the invention]
By the way, in a kneader, a rotor is often configured using a screw piece called a kneading disk. The kneading disc is a plate having at least one peak on the outer periphery. When a rotor is configured using such a kneading disk, a large number of kneading disks are sequentially fitted to the rotating shaft while shifting the phase in the circumferential direction. The phase angle is considered to be 30 °, 45 °, or 60 °, but 45 ° is the most common.
When manufacturing a rotor using such a kneading disk, it is desirable that the shaft holes provided in each kneading disk be exactly the same from the standpoint of assembling work and productivity of the kneading disk. That is, it is desirable that the shaft hole of each kneading disk has a reference line at the same position with respect to a certain reference line of the kneading disk.
[0005]
However, if the kneading disc is fitted to the rotary shaft by an involute spline as in the prior art, it is difficult to arrange all the reference lines of the shaft holes of each kneading disc at the same position. This is because the number of teeth of the involute spline is inevitably determined by the shaft diameter and the module. For example, if the module m is 3, the pitch circle diameter d of the shaft hole of the rotating shaft and the kneading disk is 69 mm, the number of teeth Z is 21, and if m = 2.5 and d = 70 mm, Z = 28. In the case of such involute splines, if the reference lines of the shaft holes formed in each kneading disc are all arranged in the same manner, the kneading discs are shifted by 45 ° in the circumferential direction and fitted to the rotating shaft. Can not be. Also, when the rotary shaft has a regular hexagonal cross section and the kneading disc shaft hole is a regular hexagon, and they are fitted, if the reference lines of the shaft holes of each kneading disc are all arranged in the same manner, the kneading disc shaft holes have the same arrangement. Even if the kneading disc can be assembled by shifting by 60 ° in the circumferential direction, it cannot be shifted by 45 °.
[0006]
For this reason, in a split rotor using conventional kneading discs, if the kneading discs are shifted by 45 ° and assembled, the reference lines of the shaft holes provided in each kneading disc must be arranged differently. Was needed. In such a case where the position of the reference line of the shaft hole of each kneading disc is made different, it is necessary to change the direction of the reference line of the kneading disc each time when forming the shaft hole in the kneading disc. There is a problem that the processing work becomes complicated. In addition, since it is necessary to sequentially select specific kneading disks at the time of assembling, the work becomes complicated. In particular, in the case of a twin-screw kneader, if the assembly order is wrong, the opposing kneading disks may interfere with each other and break during rotation of the pair of rotors. Is required.
[0007]
The present invention has been made in view of such problems in the prior art, and its purpose is to shift the shaft holes provided in each screw piece by 45 ° in the circumferential direction while keeping the same arrangement of the shaft holes. It is possible to obtain a split rotor of a screw-type kneading extruder that can be assembled easily and can be manufactured at low cost.
[0008]
[Means for Solving the Problems]
In order to achieve this object, in the present invention, the rotating shaft and each screw piece are each fitted and fixed via one key. The rotary shaft has a circular cross section, and four key grooves of first to fourth key grooves are provided on the outer peripheral surface thereof. Among them, the second key groove, the third key groove, and the fourth key groove are sequentially arranged at positions away from the first key groove by 90 °, 135 °, and 225 ° in the circumferential direction, respectively. On the other hand, each of the screw pieces is provided with one key groove at the same position on the outer periphery of the shaft hole fitted to the rotating shaft. And the key which transmits rotational torque from a rotating shaft to each of those screw pieces is made into the length which is equal to the axial direction length of the screw piece, or slightly shorter than it.
[0009]
In particular, when at least a part of the screw piece is a kneading disc, each kneading disc has its key groove and four key grooves provided on the rotation shaft, the first key groove, the first key groove, and the like. The axis of the rotary shaft is shifted by 45 ° in the circumferential direction by making the four key grooves, the second key groove, the third key groove opposite to each other in the order, and fitting the keys between them. The direction is fixed in order.
Further, when the kneading extruder is a biaxial screw type kneading extruder rotating in the same direction, the first to fourth key grooves provided on the rotating shafts of the respective rotors are arranged at the same position. Is done.
[0010]
In this way, by making the positions of the key grooves provided on the outer periphery of the shaft hole of each screw piece the same, it is only necessary to form exactly the same hole in each screw piece. When the screw piece is a kneading disk, the kneading disks are all the same, so that it is not necessary to pay attention to the assembly order. Then, the key groove on the outer periphery of the shaft hole of each kneading disk and the four key grooves provided on the rotary shaft are arranged in the order of the first key groove, the fourth key groove, the second key groove, and the third key groove. Alternatively, if they are opposed to each other in the reverse order, and the keys are fitted and fixed between them, each kneading disk is assembled with a phase angle of 45 ° in the circumferential direction. The assembly work is also extremely simple.
In the case of a twin-screw kneading extruder, each rotor screw piece needs to be assembled so as to have a phase angle of 90 °. However, if the above-mentioned key groove is provided on the rotary shaft and screw piece, Such assembly can be easily performed only by arranging the first to fourth key grooves on the rotation shaft of the rotor to be exactly the same.
[0011]
In this way, when the rotary shaft and each screw piece are fitted and fixed through one key, each screw piece is assembled by shifting by 45 °, or a phase angle of 90 ° is set on the screw piece of the biaxial rotor. In order to be able to hold and assemble, one keyway is provided on the outer periphery of the shaft hole of the screw piece, and eight keys are provided at an interval of 45 ° on the entire outer periphery of the rotary shaft. Although it is conceivable to provide a groove, since the strength of the rotating shaft is reduced, the torque that can be transmitted to the screw piece is reduced. If the second to fourth key grooves are sequentially arranged at 90 °, 135 °, and 225 ° in the circumferential direction from the first key groove as in the present invention, each key groove is circular. Since they are distributed in the circumferential direction, a sufficient transmission torque can be secured.
In addition, it is conceivable that the shaft hole provided in each screw piece is a regular octagon, and the cross section of the rotating shaft is a regular octagon that fits into it. However, the transmission torque becomes small. In addition, processing becomes difficult and the manufacturing cost increases. In the case of the present invention, it is only necessary to provide a key groove in each of the rotary shaft having a circular cross section and the circular shaft hole of the screw piece.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an example of a split-type rotor of a screw-type kneading extruder according to the present invention, FIG. 1 is a plan view of the rotor, and FIG. 2 is a cross-sectional view of a rotating shaft used in the rotor, FIG. 3 is an end view of the screw piece fitted to the rotating shaft.
[0013]
As is apparent from FIG. 1, this rotor is a rotor for a twin-screw kneading extruder, and is composed of a first rotor 1a and a second rotor 1b that are arranged close to each other in parallel. Each rotor 1a, 1b is provided with a first feed zone I, a first kneading zone II, a second feed zone III, a second kneading zone IV, and a third feed zone V, respectively. These zones are configured by fitting a large number of screw pieces in order to the outer periphery of the rotary shafts 2a and 2b, which are drive shafts of the rotors 1a and 1b. That is, the first feed zone I is configured by fitting forward screw pieces 3a and 3b and reverse screw pieces 4a and 4b in order in the axial direction, and the first kneading zone II includes 10 sheets. The kneading discs (one type of screw pieces) 5a to 14a and 5b to 14b are sequentially fitted in the axial direction. The second feed zone III is constituted by continuously fitting three forward screw screw pieces 15a and 15b in the axial direction, and the second kneading zone IV is composed of nine kneading disks 16a and 16a. ,...; 16b, 16b,... Are sequentially fitted in the axial direction. The third feed zone V has the same configuration as the second feed zone III. The screw pieces 3a, 3b and 15a, 15b of the forward screw have a length of 1 pitch, and the screw pieces 4a, 4b of the reverse screw have a length of a half pitch. The kneading disks 5a to 14a and 16a; 5b to 14b and 16b are plate-shaped having a certain thickness.
These screw pieces 3a to 16a and 3b to 16b are tightened so as not to move in the axial direction by bolts 17a and 17b fastened to the tips of the respective rotary shafts 2a and 2b.
[0014]
The rotary shafts 2a and 2b are driven to rotate in the same direction in synchronization with each other by a motor via a reduction gear (not shown).
Each rotary shaft 2a, 2b has a circular cross section, and four key grooves 18a-21a, 18b-21b extending in the axial direction are formed on the outer peripheral surface of the rotary shaft 2a, 2b over substantially the entire length of the screw piece fitting portion. . As shown in FIG. 2, the key grooves 18a to 21a of one rotating shaft 2a and the key grooves 18b to 21b of the other rotating shaft 2b are arranged at the same position. That is, the first key grooves 18a and 18b of the rotary shafts 2a and 2b are both positioned above (in the reference line Z-axis direction) in FIG. 2 in a certain state. The second key grooves 19a and 19b are provided at positions 90 degrees clockwise from the first key grooves 18a and 18b. The third key grooves 20a, 20b are provided at a position 45 degrees clockwise from the second key grooves 19a, 19b, that is, at a position 135 degrees away from the first key grooves 18a, 18b in the circumferential direction. . Further, the fourth key grooves 21a and 21b are provided at a position 90 degrees clockwise from the third key grooves 20a and 20b, that is, at a position 225 degrees away from the first key grooves 18a and 18b in the circumferential direction. ing.
[0015]
On the other hand, as shown in FIG. 3, each of the screw pieces 3a to 16a and 3b to 16b has a substantially elliptical cross-section having two crests 22 and 23 on the outer periphery, and each of the screw pieces 3a to 16a and 3b to 16b A circular shaft hole 24 to be fitted to the shafts 2a and 2b is formed. And on the outer periphery of the shaft hole 24, one key groove 25 is provided on the center line (reference line) L on the long diameter side of the end faces of the screw pieces 3a to 16a, 3b to 16b.
[0016]
These screw pieces 3a to 16a and 3b to 16b are connected to the key groove 25 and any one of the first to fourth key grooves 18a to 21a and 18b to 21b formed on the outer peripheral surfaces of the rotary shafts 2a and 2b. A rotational torque is transmitted from each of the rotary shafts 2a and 2b by interposing and fixing the rotary shafts 2a and 2b with a single key therebetween. For example, the forward thread screw pieces 3a and 3b in the first feed zone I are, as shown in FIG. 4A, on the first rotor 1a side, the key groove 25 and the first key of the rotating shaft 2a. The key 26a is fitted between the groove 18a and the key 26b is fitted between the key 18a and the key groove 25 and the second key groove 19b of the rotary shaft 2b are opposed to each other on the second rotor 1b side. By this, it is being fixed to rotating shaft 2a, 2b, respectively. As shown in FIG. 4B, the screw pieces 4a and 4b of the reverse screw are also provided between the key groove 25 of the screw piece 4a and the first key groove 18a of the rotary shaft 2a, and the screw piece 4b. The key 27a and the second key groove 19b of the rotary shaft 2b are respectively fitted with the keys 27a and 27b to be fixed to the rotary shafts 2a and 2b.
Thus, the first keyway 18a of the rotating shaft 2a is used to fix the screw pieces 3a, 4a on the first rotor 1a side, and the rotating shaft 2b is used to fix the screw pieces 3b, 4b on the second rotor 1b side. By using the second key groove 19b, the screw pieces 3a, 4a on the first rotor 1a side and the screw pieces 3b, 4b on the second rotor 1b side are assembled with a phase angle of 90 °. Thus, the rotors 1a and 1b are reliably prevented from interfering with each other during rotation.
[0017]
In the first kneading zone II, the first kneading disks 5a and 5b are arranged on the key rotor 25 of the kneading disk 5a on the first rotor 1a side as shown in FIG. 5C. And a first key groove 18a of the rotary shaft 2a, and a key 28a is fitted between the key groove 25 of the kneading disk 5b and the second key groove 19b of the rotary shaft 2b on the second rotor 1b side. Each is fixed by fitting 28b. As shown in FIG. 5D, the second kneading discs 6a and 6b are arranged on the first rotor 1a side so that the key groove 25 of the kneading disc 6a and the fourth key of the rotary shaft 2a. By fitting the key 29a between the groove 21a and fitting the key 29b between the key groove 25 of the kneading disc 6b and the third key groove 20b of the rotary shaft 2b on the second rotor 1b side, respectively. It is fixed. Further, as shown in FIG. 5 (E), the third kneading disks 7a and 7b are arranged on the first rotor 1a side so that the key groove 25 of the kneading disk 7a and the second key of the rotary shaft 2a. The key 30a is fitted between the groove 19a, and the key 30b is fitted between the key groove 25 of the kneading disc 7b and the first key groove 18b of the rotary shaft 2b on the second rotor 1b side. It is fixed. As shown in FIG. 5 (F), the fourth kneading discs 8a and 8b have a key groove 25 of the kneading disc 8a and a third key groove 20a of the rotating shaft 2a on the first rotor 1a side. And the key 31a is fitted between the key groove 25 of the kneading disc 8b and the fourth key groove 21b of the rotary shaft 2b on the second rotor 2b side. ing. The fifth kneading disks 9a and 9b are assembled in the same manner as the first kneading disks 5a and 5b.
[0018]
As described above, on the first rotor 1a side, each kneading disk 5a to 9a has the key groove of the rotary shaft 2a as the first key groove 18a, the fourth key groove 21a, the second key groove 19a, and the third key groove. 20a and the first keyway 18a are used in this order to be fixed to the rotary shaft 2a. On the second rotor 1b side, the kneading disks 5b to 9b are connected to the keyway of the rotary shaft 2b by the second keyway 19b, The third key groove 20b, the first key groove 18b, the fourth key groove 21b, and the second key groove 19b are used in this order to be fixed to the rotary shaft 2b. That is, on any of the rotors 1a and 1b, the kneading disks are assembled in the order of the first key groove, the fourth key groove, the second key groove, and the third key groove of the key grooves of the rotary shafts 2a and 2b. It is said that the order. By adopting such an order, the kneading discs are fixed in order in the axial direction of the rotating shaft by shifting by 45 ° in the circumferential direction. Further, only the first kneading disks 5a and 5b are assembled while being shifted by 90 ° from each other, and the subsequent kneading disks 6a to 9a and 6b to 9b are also arranged on the first rotor 1a side and the second rotor 1b side. Each is assembled with a phase angle of 90 °.
In this rotor, the sixth kneading disks 10a and 10b to the tenth kneading disks 14a and 14b are in the assembled state shown in FIG. By repeating the assembled state shown in (C), the adjacent kneading disks are set to orthogonal kneading that is shifted by 90 °.
[0019]
Then, as shown in FIG. 6G, the first screw pieces 15a and 15b in the second feed zone III are, on the first rotor 1a side, the key grooves 25 and the second of the rotary shaft 2a. A key 32a is fitted between the key groove 19a and the key 32b is fitted between the key groove 19a and the key groove 25 is fitted between the key groove 25 and the first key groove 18b of the rotary shaft 2b on the second rotor 1b side. By doing so, it is being fixed to rotating shaft 2a, 2b, respectively. The second and third screw pieces 15a and 15b are similarly assembled. As described above, since the screw pieces 15a and 15b of the forward screw are both 1 pitch in length, the second feed zone III becomes a continuous screw by such assembly. In addition, the screw piece 15a on the first rotor 1a side and the screw piece 15b on the second rotor 1b side are each assembled with a phase angle of 90 °.
[0020]
In the second kneading zone IV, the first to ninth kneading disks 16a, 16a,...; 16b, 16b,. D) is fixed to the rotary shafts 2a and 2b by repeating the assembly sequence shown in FIG. That is, also in the second kneading zone IV, as in the first kneading zone I, the assembly order of the kneading disks 16a and 16b on the rotors 1a and 1b side is the same as that of the key grooves of the rotary shafts 2a and 2b. The key groove, the fourth key groove, the second key groove, and the third key groove are in this order. As a result, adjacent kneading disks 16a, 16a,... And 16b, 16b,... Are shifted by 45 ° in the circumferential direction and are sequentially fixed in the axial direction of the rotating shaft, and the kneading on the first rotor 1a side is also performed. The disc 16a and the kneading disc 16b on the second rotor 1b side are each assembled with a phase angle of 90 °.
[0021]
The third feed zone V is assembled in exactly the same way as the second feed zone III.
In this way, the screw pieces 3a to 16a and 3b to 16b are all fixed to the rotary shafts 2a and 2b by the keys 26a to 32a and 26b to 32b, and the keys 26a to 32a, Rotational torque is transmitted through 26b-32b. The keys 26a to 32a and 26b to 32b are set to have a length equal to or slightly shorter than the axial length of the corresponding screw pieces 3a to 16a and 3b to 16b. , 2b, when the bolts 17a, 17b are tightened, the adjacent screw pieces 3a-16a, 3b-16b are brought into close contact with each other.
[0022]
In the screw-type kneading and extruding machine using the rotor configured as described above, when the motor is operated, the rotating shafts 2a and 2b rotate in synchronization in the same direction as indicated by arrows in FIG. In connection with it, each screw piece 3a-16a, 3b-16b rotates similarly. In this state, a kneading material, for example, waste plastic such as a vinyl chloride sheet, is charged into the cylinder from the charging port provided on the first feed zone I side of the rotors 1a and 1b. Then, the material is fed toward the tip side of each rotor 1a, 1b by the screw pieces 3a, 3b of the forward screw, and then the feed speed is decelerated by the screw pieces 4a, 4b of the reverse screw. Then, in the first kneading zone II, the kneading disks 5a to 14a and 5b to 14b are each cut and pulverized. The pulverized material is then strongly fed toward the second kneading zone IV by the three forward screw screw pieces 15a and 15b in the second feed zone III, and at least a part thereof is melted. . Next, in the second kneading zone IV, the material is completely melted and kneaded by nine kneading disks 16a and 16b, and finally pushed out from the discharge port by the feeding force of the third feeding zone V. The molten material extruded from the kneading extruder is usually sent to a granulator to form pellets.
[0023]
When kneading different materials or changing the kneading conditions, the bolts 17a and 17b are removed from the tips of the rotary shafts 2a and 2b, and the screw pieces 3a to 16a and 3b to 16b are removed. And the combination of screw piece 3a-16a, 3b-16b is changed suitably, and it reassembles to rotating shaft 2a, 2b. Thereby, the screw shape of each rotor 1a, 1b is changed.
Thus, when each screw piece 3a-16a, 3b-16b is assembled | attached to rotating shaft 2a, 2b, screw piece 3a, 3b of forward screw; 15a, 15b and screw piece 4a, 4b of reverse screw are the 1st rotor 1a. When the first key groove 18a of the rotating shaft 2a is used for assembling one screw piece 3a, 4a, 15a on the second rotor 1b side, the rotating shaft 2b is used for assembling the other screw piece 3b, 4b, 15b. When the second key groove 19a of the rotary shaft 2a is used for assembling one screw piece 3a, 4a, 15a, the other screw piece 3b, 4b, 15b is used for assembling the other screw piece 3b, 4b, 15b. Only by using the first keyway 18b, the screw pieces 3a, 4a, 15a on the first rotor side 1a and the second rotor 1b are used. The screw piece 3b, 4b, will have a phase angle of 90 ° and 15b, each rotor 1a, because they may interfere eliminates one another during rotation 1b, the the assembling work is easy.
Further, when the kneading disks 5a to 14a and 16a; 5b to 14b and 16b are assembled to the rotary shafts 2a and 2b, the first kneading disks, for example, 5a and 5b are connected to the first rotor 1a side and the second rotor. As long as the rotors 1b are assembled with a 90 ° offset from each other, the subsequent kneading discs 6a to 9a and 6b to 9b have the key grooves of the rotary shafts 2a and 2b as the first key grooves, the fourth key grooves, The kneading disks 5a to 9a and 5b to 9b are shifted by 45 ° in the circumferential direction and fixed in order in the axial direction of the rotary shaft only by using and assembling in the order of 2 key grooves and 3rd key grooves. Further, the first rotor 1a side and the second rotor 1b side are assembled with a phase angle of 90 °. Moreover, since the kneading disks 5a to 14a, 16a; 5b to 14b, 16b all have the same shape including the shaft hole 24 and the key groove 25, it is necessary to select a kneading disk to be assembled next. Absent. Therefore, the assembly work is also easy.
[0024]
The embodiment of the present invention has been described above with an example, but the present invention is not limited to this. For example, in the above example, the kneading disks 5a to 9a; 5b to 9b and 16a, 16a, ...; 16b, 16b, ... are assembled with the phase shifted by 45 ° in the forward screw direction, that is, clockwise. Depending on the kneading conditions, this may be the reverse screw direction. In this case, the kneading disks 5a to 9a; 5b to 9b and 16a, 16a, ...; 16b, 16b, ... are the first key groove, the third key groove of the key grooves of the rotary shafts 2a, 2b, The second key groove and the fourth key groove are assembled in the reverse order of the above example. However, even in that case, when viewed from the front end side of the rotors 1a and 1b, the order is the first key groove, the fourth key groove, the second key groove, and the third key groove.
Moreover, in said example, the one keyway 25 provided in each screw piece 3a-16a, 3b-16b is located on the centerline (reference line) L of the long diameter side of the end surface of each screw piece. However, the key groove 25 can be provided at a position away from the reference line L by a certain angle.
Furthermore, although each screw piece 3a-16a, 3b-16b demonstrated the case where it was the thing of the substantially elliptical cross-sectional shape which has the two peak parts 22 and 23 on the outer periphery, the peak part is one, or three or more The present invention can be applied in the same manner to the above. Further, the present invention can be applied not only to the twin-screw kneading extruder as in the above example but also to the rotor of a single-screw or multi-screw kneading extruder having three or more axes.
[0025]
【The invention's effect】
As is apparent from the above description, according to the present invention, the rotating shaft and each screw piece are fitted and fixed via one key, respectively, so that the rotating shaft has a circular cross section. It is only necessary to form a keyway, and its rotating shaft can be manufactured at low cost. Then, the key groove is provided with a first key groove, a second key groove, a third key groove, and a second key groove, which are provided in order at 90 °, 135 °, and 225 ° in the circumferential direction from the first key groove, respectively. Since there are four keyways with the fourth keyway, it is possible to easily perform the work of assembling each screw piece by shifting by 45 ° or by giving the screw piece of the biaxial rotor to a phase angle of 90 °. It becomes possible.
Further, since the positions of the key grooves provided on the outer periphery of the shaft hole of each screw piece are the same, it is only necessary to form exactly the same hole in each screw piece, and the processing becomes easy. In particular, when the screw piece is a kneading disc, the kneading discs are all the same, so that it is not necessary to pay attention to the assembling order, and the assembling operation is extremely easy.
[Brief description of the drawings]
FIG. 1 is a plan view showing an example of a split rotor of a screw kneading extruder according to the present invention.
2 is a cross-sectional view of a rotating shaft used in the rotor of FIG.
FIG. 3 is an end view of a screw piece fitted to the rotation shaft of FIG. 2;
4A and 4B are cross-sectional views as viewed in the direction of the arrow from the AA and BB lines in FIG. 1, respectively.
FIGS. 5 (C), (D), (E), and (F) are viewed in the direction of the arrow from the CC, DD, EE, and FF lines of FIG. 1, respectively. It is sectional drawing.
FIG. 6G is a cross-sectional view taken along the line GG in FIG.
[Explanation of symbols]
1a, 1b rotor
2a, 2b Rotating shaft
3a, 4a, 15a screw piece
4a, 4b, 15b Screw piece
5a-14a, 16a Kneading disc (screw piece)
5b-14b, 16b Kneading disc (screw piece)
18a, 18b 1st keyway
19a, 19b Second keyway
20a, 20b 3rd keyway
21a, 21b 4th keyway
25 keyway
26a-32a, 26b-32b key

Claims (3)

In a split-type rotor of a screw-type kneading and extruding machine configured by fitting and fixing a plurality of screw pieces in order in the axial direction on the outer periphery of a rotating shaft driven to rotate by a motor;
The rotary shaft has a circular cross section, a first keyway is provided on the outer peripheral surface thereof, and a second key is located at a position 90 °, 135 °, 225 ° apart from the first keyway in the circumferential direction. A groove, a third key groove, and a fourth key groove are provided in this order,
Each of the screw pieces is provided with one key groove at the same position on the outer periphery of the shaft hole fitted to the rotating shaft,
Each of the screw pieces has one key whose length is equal to or slightly shorter than the axial length of the screw piece, one of the first to fourth key grooves of the rotating shaft and the key of the screw piece. By being fitted between the grooves, each is fixed to the rotating shaft,
Split-type rotor for screw kneading extruder. At least a part of the screw piece is a kneading disc,
Each of these kneading discs has a key groove and four key grooves provided on the rotating shaft, the first key groove, the fourth key groove, the second key groove, the third key groove, Alternatively, it is opposed in the reverse order, and the keys are fitted between them, so that they are shifted in the circumferential direction by 45 ° and fixed in order in the axial direction of the rotating shaft.
The split rotor of the screw type kneading extruder according to claim 1. The kneading extruder is a biaxial screw kneading extruder rotating in the same direction;
The first to fourth key grooves provided on the rotation shafts of the rotors are arranged so as to be at the same position, respectively.
The split-type rotor of the screw-type kneading extruder according to claim 1 or 2.

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