JPH08418B2 - Drive transmission device for twin screw extruder - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive transmission device for a twin-screw extruder used in a twin-screw extruder for molding plastic or the like.

[0002]

2. Description of the Related Art A drive transmission device for a twin-screw extruder, which transmits a driving force to first and second output shafts that rotate integrally with first and second screws, is required to have higher torque than before. In order to realize it, power up the motor and
Along with this, increasing the size of the bearing against the increase in the radial force generated in the gear meshing portion of the first and second output gears fitted in the first and second output shafts, and the gear teeth. It is desired to widen the width and secure tooth contact.
However, since the distance between the two shafts is extremely narrow with respect to the required high torque, it becomes an obstacle to making the bearing larger and the tooth width of the gear wider, and the driving force of high torque is It was difficult to communicate.

In order to solve the above problems, Japanese Patent Publication No. 62-
The drive transmission device 46 disclosed in No. 12415 is known. The drive transmission device 46 of the conventional twin-screw extruder will be described with reference to FIGS. 5 and 6. 5 is a cross-sectional view and FIG. 6 is a side view of the gear arrangement of FIG.

The drive transmission device 46 of the conventional twin-screw extruder is
The first connected to the first and second screws 41 and 42
The second output shafts 31 and 32, the first and second output gears 39 and 40 that are fitted in the first and second output shafts in the thrust direction, and the second output gear 40 from above and below The transmission gears 33 and 34 which are engaged with each other so as to be sandwiched, and the transmission gears 33 and 34 which are fitted at one ends thereof, respectively.
The casing 43 includes lower transmission shafts 35 and 36, and transmission gears 37 and 38 that are fitted into the other ends of the upper and lower transmission shafts 35 and 36, respectively, and mesh with each other so as to sandwich the output gear 39 from above and below. It is stored in. The drive shaft 30 from the drive source is directly connected to the output gear 40. A torsion bar is used for the output shaft 32 so as to correct a phase shift due to a difference in torsional rigidity between the output shaft 32 and the output shaft 31.

At this time, the upper and lower transmission shafts 35, 36 and the transmission gears 33, 37, 34, 38 at both ends thereof are connected by a spline and fixed in the radial direction. The number of teeth of the splines at both ends is different by one so that the phases of the gears can be matched. And
Bearings are provided on both sides of each of the transmission gears 33, 37, 34 and 38 to support the transmission gear together with the shaft so as to be rotatable in the radial direction. For example, the transmission gear 37 has 44 and 45.

The drive transmission device 46 of the conventional twin-screw extruder having such a structure outputs the drive force from the drive shaft 30 to the output gear 40.
Through 1/2 to transmit to the second output shaft 32 to rotate the second screw, and further to transmit gears 33.3
The driving force is distributed to the upper and lower quarters by 4 and the upper and lower transmission shafts 3
The first output gear 39 is sandwiched by the transmission gears 37 and 38 from above and below through the gears 5 and 36, and the first screw is transmitted to the first output shaft 31. In this way, if the first output gear 39 is sandwiched from above and below, the radial load generated at the gear meshing portion of the first output gear is canceled, so that a high torque driving force can be transmitted.

By the way, as described above, in order to cancel the radial load generated at the gear meshing portion of the first output gear, the transmission gear 3 at the gear meshing portion of the first output gear is canceled.
It is necessary that the gears 7 and 38 are evenly meshed with each other and that the transmission gears 33 and 34 are used to distribute the driving force evenly. Therefore, accurate phase matching must be performed at the meshing parts of each gear. Such phase matching is achieved by the transmission gears 33, 34,
37 and 38 are incorporated into the upper and lower transmission shafts 35 and 36,
The phase shift of the other transmission gear is measured with reference to the meshing of one transmission gear of each of the lower transmission shafts 35 and 36, and the other transmission gear is installed again at a position where this phase shift is absorbed. It is done by Therefore, above
The number of teeth of the spline on both ends of the lower transmission shafts 35 and 36 is different from each other by one.

[0008]

However, such phase matching requires the insertion and removal of the spline and the transmission gear at the time of assembling the drive transmission device of the twin-screw extruder,
The transmission gear has to be taken out, disassembled, and reassembled, which is very troublesome.

The drive transmission device for a twin-screw extruder according to the present invention has been made in view of the above problems.
Drive of a twin-screw extruder that can be adjusted in a timely manner so that the driving force is equally transmitted to each series without the need for disassembling or reassembling the drive transmission device for phase adjustment. It is intended to provide a transmission device.

[0010]

In order to achieve the above object, the drive transmission device for a twin-screw extruder according to the present invention is a twin-screw extruder.
First and second output shafts connected to the first and second screws of
A first member that is axially displaced and fitted into each of the first and second members 22 and 22.
・ Upper the second output gears 23, 24 and the first output gear 23
First lower and first upper gears 25 arranged so as to be sandwiched from below,
26 and the second output gear 24 from above and below
Second lower and second upper gears 27 and 28 to be placed, and the first upper
.Two gears 1 meshing with each of the second upper gears 26, 28
Upper intermediate shaft 11 into which 9, 20 are fitted, and the first lower / first
Two gears 12 that mesh with each of the two lower gears 25 and 27,
Lower intermediate shaft 14 in which 13 is fitted, and upper and lower intermediate parts of these
Upper and lower input gears 15 fitted into the shafts 11 and 14,
A central shaft 1 having a drive gear 16 meshing in common with 16
8 and the driving force from the driving gear 16
Distribute 1/4 to gears 19, 20, 12, 13
A drive transmission device for a twin-screw extruder , wherein the four gears are provided.
Let 19, 20, 12, 13 be helical gears, and
Two helical screws for the first output shaft 21 of the SUBA gear
Two gears for the bar gears 12, 19 and the second output shaft 22
Two of at least one of the helical gears 13 and 20
The helical gear is slidably fitted on the shafts 11 and 14.
However, an axial minute moving means for the two helical gears is provided.

The four helical gears 19, 20,
12 and 13 are slidably inserted into the shafts 11 and 14
Then, the axial minute movement means of the four helical gears is provided.
Those are preferable.

[0012]

The driving force from the driving gear 16 is applied to the four teeth.
Divide into 1/4 for cars 19, 20, 12, 13 and
Two helical gears 12, 19 are separated from one output shaft 21.
It carries two helical gears 1 for the second output shaft 22.
Since 3 and 20 share, two helical gears 12 and 19
And at least one of the two helical gears 13 and 20
The helical gear of is slidably fitted to the shaft, and the two
If a means for moving the helical gears in the axial direction is provided, the helical gears
The movement of the car in the thrust direction causes the gear meshing
Phase change, phase adjustment of the gear becomes possible, the first and second
The distribution ratio of the driving force to the output shafts 21 and 22 can be adjusted.
It In addition, the four helical gears 19, 20, 12, 1
3 is slidably fitted into the shafts 11 and 14, and
If a small axial moving means is provided for each helical gear, 1 /
The distribution ratio of the driving force of 4 can be adjusted.

[0013]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of an embodiment of the present invention, and FIGS. 2 to 4 are other embodiments of the present invention.

As shown in FIG. 1, the axial minute moving means 10 of the helical gear of the present invention is provided with a helical gear 3 slidable in the thrust direction and a shaft 2 together with the helical gear 3 so as to be rotatable in the radial direction. The bearings 4 and 5 that support the adjustment screw 6 that indirectly positions the helical gear 3 through the bearing 4 on the thrust force load side of the helical gear 3, and the bearing screw 5 that indirectly extends the helical gear 3 from the anti-load side. It is configured with a spring 7 that is pressed against and is housed in the casing 1. The screw portion 6a of the adjusting screw 6 is provided on the outer periphery so as to engage with the screw portion 1a in the casing 1, and the shaft 2 side has a structure in which the center is recessed so as not to directly touch the shaft 2. Also, in the casing 1,
A removable cap 9 for enabling the phase adjustment by an external adjustment screw 6 is attached by a screw 8. 6b is a stopper after positioning on the adjusting screw 6.

The operation of the axially minute moving means 10 of the helical gear thus configured will be described. When adjusting the phase of the gear after the drive transmission device is assembled, loosen the screw 8 of the casing 1, remove the cap 9, and use an auxiliary member having a surface that engages with the recess 6c provided in the adjustment screw 6. The adjusting screw 6 is rotated to move in the thrust direction. Along with this, the helical gear 3 also moves in the thrust direction, so the phase of the helical gear itself changes at the gear meshing portion. Thereby, the phase of the gear is adjusted, and when the position is determined, the adjusting screw 6 is fixed by the stopper 6b, the cap 9 is closed again, and the screw 8 is tightened to complete the phase adjustment.

The above-mentioned small axial movement means 10 of the helical gear is transmitted to either one of the transmission gears 33 and 34 in the drive transmission device 46 of the conventional twin-screw extruder shown in FIG. If provided on one of the gears 37, 38,
Phase adjustment can be performed without the need for disassembling or reassembling the drive transmission device for phase adjustment, and it is possible to perform timely adjustment so that the driving force is equally transmitted to each series. Further, it is possible to provide a drive transmission device of a twin-screw extruder capable of transmitting a high-torque driving force with which both screws can be sufficiently synchronized. In addition, since the biasing force of the spring 7 works even when the drive transmission device of the twin-screw extruder is stopped, it is possible to regulate the play of the helical gear 3 and the bearings 4 and 5.

Next, to the drive transmission device 29 of another twin-screw extruder which is composed of a vertically distributed gear train so as to sandwich both the output gears fitted in the first and second output shafts from above and below, Another embodiment using the axially minute moving means 10 of the helical gear will be described with reference to FIGS. 2 is a drive system diagram, FIG. 3 is a side view of the gear arrangement, and FIG. 4 is A of FIG.
FIG.

The drive transmission device 29 of another twin-screw extruder is connected to the first and second screws and is connected to the first and second output shafts 21.
A first and a second that are fitted into each of the 22 by being axially displaced.
As shown in FIG. 3, the output gears 23 and 24, the first lower and first upper gears 25 and 26 arranged so as to sandwich the first output gear 23 from above and below, and the second output gear 24 are provided. , Fig. 3
As shown in Figure 2, the second bottom
The output from the common drive source C is equally divided into 1/4 for the second upper gear 27/28 and the first lower / first upper / second lower / second upper gear 25/26/27/28. And a reduction gear mechanism B for distributing the same.

A reduction gear mechanism B of a drive transmission device 29 of another twin-screw extruder has an upper intermediate shaft 11 into which gears 19 and 20 meshing with the first and second upper gears 26 and 28 are fitted.
Gear 1 that meshes with each of the first and second lower gears 25 and 27
Lower intermediate shaft 14 into which 2 and 13 are fitted, and upper and lower input gears 1 fitted into these upper and lower intermediate shafts 11 and 14, respectively.
5 and 16 and a central shaft 18 having a drive gear 17 meshing in common. At this time, in order to correct the phase shift due to the torsional stiffness of the output shafts 21 and 22, as shown in FIG.
The difference in torsional stiffness generated from the distance X1 between the lower input gears 15 and 16 and the gears 19 and 12 and the distance X2 between the upper and lower input gears 15 and 16 and the gears 20 and 13 is the first and second output shafts 21 and
First and second output gears 23 and 24 at 22 and first and second output gears
The gears 20 and 13 are arranged so as to be equal to the difference in torsional rigidity caused by the distances Y1 and Y2 to the screw connecting portion.

Further, the upper and lower intermediate shafts 11 and 14 are formed of four torsion bars 11a, 11b, 14a and 14b, and the torsion bars 11a and 14a are connected to the torsion bars 14b and 11b by splines, respectively. ing.

Since the reduction gear mechanism B in the drive transmission device 29 of another twin-screw extruder has the structure as described above,
After dividing the driving force from the common driving source C into the upper and lower series common to the first and second screws by the central shaft 18 in half,
Upper / second upper and first lower / second lower series, upper / lower intermediate shaft 1
It is divided into 1/4 by 1 ・ 14, and the first and second output gears 23 ・
24 and the first output gear 23, as shown in FIG. 3, so as to be sandwiched from above and below by the first lower and first upper gears 25 and 26,
As shown in FIG. 3, the second output gear 24 is set to the second lower / second
The upper gears 27 and 28 are arranged so as to be sandwiched from above and below, and the radial load generated at the gear meshing portion of the first and second output gears 23 and 24 is canceled to enable transmission of high torque driving force. The phase shift due to the torsional stiffness of the output shafts 1 and 2 is corrected by the position of the gears 10 and 13.

The upper and lower intermediate shafts 11 and 14 are formed of torsion bars 11a, 11b, 14a and 14b, and if there is only a phase shift due to the difference in torsional stiffness of the first and second output shafts 21 and 22. First, the torsion bar itself twists to absorb the phase shift of the gear caused by wear of the gear and eliminates the shift at the meshing portion of the gear. As a result, the driving force is evenly distributed at the meshing portions of the gears.

This torsion bar absorbs a phase shift generated during operation to ensure equal distribution, and does not absorb a phase difference caused by machining errors of individual gears during assembly. Therefore, in addition to the above, the axial minute moving means 10 of the helical gear of the present invention is provided with the gears 19, 20 and 13.
・ If it is installed in 12, the phase can be adjusted at the time of assembly without disassembling and reassembling the drive transmission device for phase adjustment, so that the driving force is equally transmitted to each series. It is possible to make timely adjustments.

[0024]

The drive transmission device of the twin-screw extruder of the present invention is
The driving force from the driving gear 16 is applied to the four gears 19 and 2
0, 12, 13 divided into 1/4 and 4 teeth
The wheels 19, 20, 12, 13 are helical gears, and these
Of the helical gears, two helical gears for the first output shaft 21
Two helical bars for gears 12, 19 and second output shaft 22
Two has bars for at least one of the gears 13, 20
The gear is slidably fitted on the shafts 11 and 14, and
Axial micro-moving means is provided for the two helical gears.
So that the two helical gears are moved in the thrust direction,
By changing the phase at the gear meshing part, it is possible to adjust the phase of the gear, without disassembling the drive transmission device for phase adjustment, reassembling, etc.
It is possible to make timely adjustment so that the driving force is equally transmitted to the output shafts 20 and 21 .

[Brief description of drawings]

FIG. 1 is an embodiment of a drive transmission device for a twin-screw extruder according to the present invention.

FIG. 2 is a drive system diagram of another embodiment of the present invention.

3 is a side view of the gear arrangement of FIG.

FIG. 4 is an AA development view of FIG.

FIG. 5 is a cross-sectional view of a drive transmission device of a conventional twin-screw extruder.

6 is a side view of the gear arrangement of FIG.

[Explanation of symbols]

 10 Axial minute movement means of helical gear 1 Casing 1a Screw portion (casing) 2 Shaft 3 Helical gear 4 Bearing 5 Bearing 6 Adjusting screw 6a Screw portion (adjusting screw) 6b Stopper 6c Recess 7 Spring 8 Screw 9 Cap

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tokufumi Fukano 4-1-1 Hinode-cho, Nada-ku, Kobe-shi, Hyogo Prefecture Kobe Steel Works, Ltd. Iwaya Plant (72) Inventor Tatsuya Uemura Hinode, Nada-ku, Kobe-shi, Hyogo Prefecture 4-1-1, Machi Kobe Steel Co., Ltd. Inside Iwaya Plant (72) Inventor Tatsuo Yagi 1-3-18, Wakihamacho, Chuo-ku, Kobe-shi, Hyogo Kobe Steel Works, Ltd. Kobe Head Office (56) References Actual Kaihei 1-169645 (JP, U) JP 62-12415 (JP, B2)

Claims (2)

[Claims] 1.Connected to the first and second screws of the twin-screw extruder
Axial to each of the first and second output shafts 21 and 22 to be connected.
First and second output gears 23, 24 that are displaced and fitted
When, The first output gear 23 is arranged so as to sandwich it from above and below.
1 lower / first upper gear 25, 26, Arranged to sandwich the second output gear 24 from above and below
Second lower and second upper gears 27, 28, 2 meshing with each of the first upper and second upper gears 26, 28
An upper intermediate shaft 11 into which individual gears 19 and 20 are fitted, 2 which meshes with each of the first lower and second lower gears 25, 27
A lower intermediate shaft 14 in which the individual gears 12, 13 are fitted, The upper and lower intermediate shafts 11 and 14 fitted into each
.Drive gear 1 that is commonly meshed with the lower input gears 15 and 16
A central shaft 18 having 6 and The driving force from the drive gear 16 is converted into four gears 19,
Twin screw extruder that distributes 1/4 of 20, 12, 13
A drive transmission device of The four gears 19, 20, 12, 13 are helical gears.
However, among these helical gears, the first output shaft 21 is paired with
Two helical gears 12 and 19 and the second output shaft 22
At least one of the two helical gears 13, 20 for
The two helical gears on one side with respect to the shafts 11 and 14
Slidingly fits the two Axial minute movement of helical gear
Drive transmission of a twin-screw extruder characterized by providing a moving means
apparatus. 2. The four said helical gears 19, 20, 1
2 and 13 are slidably fitted into the shafts 11 and 14
Then, the axial minute movement means of the four helical gears is provided.
The drive transmission device for a twin-screw extruder according to claim 1.