JP2510891B2 - Extrusion equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to an extrusion apparatus used in injection molding, extrusion molding, etc. (Prior Art) An extrusion cylinder used as an extrusion apparatus used in injection molding, extrusion molding, etc. The one with a built-in screw is widely used.

FIG. 5 shows an example thereof. As shown in the figure, in this extrusion device, a hydraulic motor (drive device) 104 is attached to the rear end of the extrusion cylinder 100 via a bearing case 102, and Screw inserted 1
06 Hydraulic motor 1 via a transmission shaft 110 with a hollow rear end 1
It is connected to the output shaft 112 of 04. And in the case of this extrusion device, as shown in the figure, in a state where the transmission shaft 110 is rotatably supported by the bearing case 102 via the bearing 114, the screw 106 is rotationally driven by the hydraulic motor 104, By driving the screw 106 to rotate normally by the hydraulic motor 104, a large pressure is generated in the extruded material such as rubber that is supplied into the cylinder 100 from a material supply port (not shown) near the rear portion of the extrusion cylinder 100, and
The discharge port at the tip of the cylinder 100 is advanced toward the tip of the cylinder 100.
It is designed to be discharged from 116 into the inside of an injection cylinder having an injection blanker.

If the extruded material is left in the extrusion cylinder 100 when the apparatus is stopped on weekends or the like, problems such as seizure of the material may occur. Therefore, in such a case, usually, the screw 106 is reversely rotated to exert a large pressure on the extruded material in the extruding cylinder 100, and the extruded material remaining in the cylinder 100 is taken out from the material supply port while being retracted. I have to.

(Problems to be solved by the invention) However, in this case, a large pressure is generated in the extruded material in the extrusion cylinder in any case, and the extruded material is inevitably passed through the material supply port portion to a certain extent.
Sent to the rear end side, and part of it is screw 106
The air enters the transmission shaft 110 side through the gap between the flight base 118 and the extrusion cylinder 100. Then, the extruded material that has entered the transmission shaft 110 side is gradually sent to the rear during a long use (usually about 1 to 2 years), passes through the rubber seal 120 on the front end side of the bearing case 102, and enters the bearing case 102. Further, since it passes through the inside of the bearing case 102 and enters the inside of the hydraulic motor 104, various troubles are caused to the transmission mechanism such as the bearing.

For example, when a large pressure acts on the extruded material to cause the extruded material to enter the bearing case 102, the rubber seal 120 on the front end side of the bearing case 102 is solidified and the sealing performance is deteriorated. If the is a rubber material, the extruded material is a bearing case
It absorbs grease in 102 and causes bearing 114 to run out of grease. Further, if the extruded material enters the hydraulic motor 104, the sealing performance of the hydraulic motor 104 will be deteriorated and the motor function will be impaired.

Therefore, in the case of the conventional device, in order to prevent the occurrence of such a defect, a discharge hole 122 is usually provided in front of the transmission shaft 110 as shown in FIG.
The extruded material that has entered the transmission shaft 110 side through the gap between the extrusion cylinder 100 and the extrusion cylinder 100 is discharged to the outside through the discharge hole 122. However, the discharge effect of the extruded material by the discharge holes 122 is low, and it is not useful for preventing the occurrence of the above-mentioned problems.

The above circumstances are not limited to the direct drive type in which the screw is directly rotated by the driving device via the transmission shaft, and the screw is driven by the driving device in a predetermined power transmission mechanism such as a gear. The same applies to an indirect drive type extrusion device that is indirectly driven via the.

For example, in the case of an extruder of the type in which a gear box is arranged behind the extrusion cylinder and the driving force of the drive device is transmitted from the gear in the gear box to the screw via the transmission shaft, the reverse rotation of the screw Of course, during forward rotation, the extruded material accumulates in the material supply port, and the extruded material that has entered the transmission shaft side enters the gear box due to the pressure generated in the extruded material inside the cylinder 100, and reduces the sealing performance of the gear box. , The gear was running out of grease.

(Means for Solving the Problems) The present invention has been made to solve such problems, and the first invention is: (a) a screw body portion formed on one axial end side; An extrusion that extends in a straight line from one end in the axial direction to the other end, which is composed of a conductive shaft portion formed on the other end side in the axial direction and an intermediate shaft portion that continuously extends between the screw body portion and the transmission shaft portion. A shaft, and (b) an extrusion cylinder that rotatably holds the screw body portion on the outer periphery of the screw body portion, and (c) a first rotatably supporting one end side in the axial direction of the transmission shaft body portion. A bearing; and (d) a second bearing that rotatably supports the axial other end side of the transmission shaft portion, and (e) a first holding hole that holds the first bearing and the second bearing. A second holding hole for holding the bearing. A transmission mechanism casing for rotatably accommodating the transmission shaft body portion, and (f) a hole penetrating in the axial direction is provided on the outer periphery of the intermediate shaft body portion so as to be surrounded. A cylindrical bank chamber casing extending in the axial direction in which the pushing cylinder and the transmission mechanism casing are coaxially connected to the first holding hole, and (g) the intermediate shaft body on the outer periphery of the intermediate shaft body portion. A collar-like member having an annular surface extending in a substantially radial direction in a direction perpendicular to the axis, which is fitted on one end side in the axial direction of the portion with one end extending portion having a predetermined axial length. A dam member and (h) a predetermined axial length and a predetermined radial length due to the one-end extending portion and the annular surface in a hole penetrating in the axial direction of the tubular bank chamber casing. The formed bank chamber, (i) an opening window provided in the bank chamber casing that penetrates the bank chamber and the outside, and (n) the transmission shaft body portion rotatably connected to the transmission shaft body portion. A rotation drive device for rotating Hole through the said axial bank chamber casing is obtained by constituting the extrusion apparatus, characterized in that it is formed in order to form essentially only the bank chamber.

The second invention is (a) a screw body portion formed on one end side in the axial direction, a conduction shaft body portion formed on the other end side in the axial direction, and a continuation between the screw body portion and the transmission shaft body portion. (B) an extrusion cylinder that rotatably holds the screw body portion on the outer periphery of the screw body portion. ) A first bearing that rotatably supports one side of the transmission shaft body in the axial direction, and (d) a second bearing that rotatably supports the other side of the transmission shaft body in the axial direction. And (e) A first holding hole for holding the first bearing so as to be detachable in one axial direction of the first bearing, and a second holding hole for holding the second bearing. The extrusion mechanism and the transmission mechanism casing that surrounds the outer periphery of the intermediate shaft portion by providing a transmission mechanism casing that rotatably accommodates the transmission shaft portion and (f) a hole that penetrates in the axial direction. A tubular bank chamber casing extending in the axial direction in which the extruding cylinder and the first holding hole of the transmission mechanism casing are coaxially connected to each other so as to be removable, and (g) the outer periphery of the intermediate shaft portion, An annular shape that is fitted to one end of the intermediate shaft portion in the axial direction with one end extending portion having a predetermined axial length, and that extends substantially outward in the direction perpendicular to the axis and has a predetermined radial length. A flange-shaped dam member having a surface, and (h) the predetermined axial length and the predetermined length due to the one-end extending portion and the annular surface in a hole penetrating the tubular bank chamber casing in the axial direction. Of the bank chamber formed with the radial length of ) An opening window provided in the bank chamber casing that penetrates the bank chamber and the outside, and (e) a rotation drive device for rotating the transmission shaft body part, which is rotatably connected to the transmission shaft body part. And an extrusion apparatus comprising:

A third invention is: (a) a screw having a screw portion on one end side in the axial direction and a base portion on the other end side; (b) an extrusion cylinder that rotatably holds the outer periphery of the screw; and (c) one end side in the axial direction. A conductive shaft coaxially connected to the base of the screw and extending from the base coaxially with the screw; and (d) rotatably supporting one axial end of the conductive shaft. (1) a second bearing that rotatably supports the other end of the transmission shaft in the axial direction; and (f) a first holding hole that holds the first bearing, and the second bearing. A transmission mechanism casing that rotatably accommodates the transmission shaft, and (g) a hole that axially penetrates the outer periphery of the transmission shaft on the one end side in the axial direction. Providing and surrounding the extrusion cylinder and the conduction A cylindrical bank chamber casing extending in the axial direction in which the push-out cylinder and the first holding hole of the transmission mechanism casing are coaxially connected to each other so that the mechanism casings can be removed, and (h) the outer periphery of the transmission shaft, An annular surface which is fitted to one end of the transmission shaft in the axial direction with one end extending portion having a predetermined axial length and which extends outward in a direction substantially perpendicular to the axis in a predetermined relational direction length; And a collar-shaped dam member having (i) a predetermined axial length and a predetermined radial direction due to the extending portion and the annular surface in a hole penetrating in the axial direction of the tubular bank chamber casing. A bank chamber formed with a length; (n) an opening window provided in the bank chamber casing that penetrates the bank chamber and the outside; and (l) a rotation of the conduction shaft rotatably connected to the conduction shaft. And a rotation drive device for Is obtained by constituting the extrusion apparatus, characterized in that there.

(Operation and effect) Since the first invention is configured as described above, the extruded material in the cylinder is not only rotated in the reverse direction of the extruding shaft but also accumulated in the material supply port during the forward rotation. When a back pressure is applied to the sheet, a part of the extruded material leaks to the other end (rear end) side of the screw body part, through the gap between the extruding cylinder and the intermediate shaft part to the intermediate shaft part While being attached around the outer peripheral surface of the shaft portion, the intermediate shaft portion is pushed and moved from one end side to the other end side.

However, a flange-shaped dam member having an annular surface in the direction perpendicular to the axis is fitted by providing one end extension part on the one axial direction side of the intermediate shaft part, and one end extension part in front of the dam member is fitted. Since the bank chamber consisting of a relatively large cylindrical space having an axial length is formed in the space of the outer peripheral bank chamber casing, the extruded material that leaks to the intermediate shaft portion side is at one end of the intermediate shaft portion. Since it is sufficiently cooled before it spreads from the side to the annular surface of the dam member, the leaked extruded material is less likely to stick to the annular surface of the dam member and is easily peeled off around the outer circumference of the extension part at one end. An annular bank can be formed so that the extruded material does not move behind the annular surface of the dam member.

It is considered that the extruded material that has leaked out is substantially cooled and accumulated in an annular shape in the annular bank, so that the extruded material is easily peeled off.

Therefore, it is possible to easily or automatically remove the ring-shaped bank from the surface portion thereof through the opening window penetrating the bank chamber provided in the bank chamber casing and the outside.

That is, depending on the type of extruded material, the extruded material leaked to the side of the intermediate shaft is accumulated in an annular shape to some extent during the rotation of the extruded shaft, then is automatically peeled off and discharged from the opening window, and a certain extruded material is largely deposited. After that, it abuts the opening window and is automatically peeled off and released. Further, when a certain amount of the extruded material has accumulated to some extent, it can be easily removed by periodically peeling it off manually.

Therefore, it is possible to reliably prevent the extruded material that has leaked from the rear end side of the screw shaft portion to the intermediate shaft portion side to move to the transmission shaft body portion rearward of the surface extending in the radial direction of the dam member, and the bank. It is possible to prevent damage to the first bearing held in the first holding hole of the conduction casing arranged rearward of the chamber and damage to the rotary drive device.

Further, since the axially penetrating hole formed in the cylindrical bank chamber casing is formed to essentially form only the bank chamber, the leaked extruded material on the annular surface of the dam member. Can be completely prevented from moving to the side of the first bearing, and the problems that occur in the transmission mechanism such as the first bearing can be substantially prevented by the simple structure of the dam member fitted to the intermediate shaft portion. can do.

A second aspect of the present invention is the first aspect of the present invention, in which a tubular bank chamber casing is detachably provided between the push-out cylinder and the transmission mechanism casing, and rotatably supports one axial direction side of the transmission shaft body portion. Since the bearing is detachably held toward the one end side in the axial direction, and the transmission shaft body portion is relatively detachable from the first bearing and the second bearing toward the one end side in the axial direction, the first In addition to the operation and effect of the invention of claim 1, the tubular bank chamber casing can be separated from the pushing cylinder and the transmission mechanism casing, and the first and second holding holes corresponding to the first holding hole and the second holding hole of the transmission mechanism casing can be held. The transmission shaft portion can be easily detached from the first bearing and the second bearing, and then the first bearing can be easily replaced, which facilitates maintenance of the first bearing.

According to a third aspect of the present invention, the screw and the transmission shaft are coaxially connected to each other, and a collar-shaped dam member is fitted to the axially constant side of the transmission shaft with one end extending portion having a predetermined axial length. Since it is attached, in addition to the action and effect of the first invention, the base of the screw can be shortened, so that the screw can be set to be substantially shorter, and the screw requiring an expensive material can be inexpensive,
The extrusion device can be provided substantially at a low cost.

(Example) Next, an example of the present invention will be described in detail with reference to the drawings.

In FIG. 2, an extrusion cylinder 10 has a discharge port 12 for discharging the extruded material at the tip (one end in the axial direction), and a hopper flange 14 in the intermediate portion near the rear end (the other end in the axial direction). In addition, it has a large-diameter mounting flange portion 16 at the rear end portion (the other end portion in the axial direction). Then, a bearing case 20 is attached to the mounting flange portion 16 of the extrusion cylinder 10 via an annular bank chamber casing 18 of a predetermined length.
Is fixed, and a hydraulic motor 24 is attached to the rear end (other end) of the bearing case 20 via an annular attachment plate 22.

On the other hand, in FIG. 2, reference numeral 26 designates a screw rotatably held in the extrusion cylinder 10, and includes a screw portion 28 on the front end side (one end side in the axial direction) and a screw part 28 on the rear end side (the other end side in the axial direction). The base 30 is composed of a base 30 and a connection base 31 and a small diameter portion 32 connecting them.

The base 30 of the screw 26 projects into a hole penetrating the bank chamber casing 18 in the axial direction, while the output shaft 34 of the hydraulic motor 24 projects concentrically with the screw 26 in the bearing case 20. Then, a hollow transmission shaft 35 is fitted over the base portion 30 of the screw 26 and the output shaft 34 of the hydraulic motor 24, and keys 38 and 40 are respectively interposed between the transmission shaft 35 and them, The screws 26 and the output shaft 34 of the hydraulic motor 24 are integrally rotated. That is, the screw 26 is driven by the hydraulic motor 24,
It is adapted to be directly rotationally driven via the transmission shaft 35.

The front end (one end in the axial direction) of the transmission shaft 35 is fixed to the plate 42 fitted in the small diameter portion 32 of the screw 26.

The transmission shaft 35 is rotatably supported by the bearing case 20 on the front side (one side in the axial direction) via the first bearing 44, and has the second bearing 45 on the rear side (the other side in the axial direction). It is rotatably supported by the bearing case 20 via.

The first bearing 44 is detachably held in the first holding hole 20a provided in the bearing case 20 from one end side in the axial direction. The second bearing 45 is detachably held in the second holding hole 20b provided in the bearing case 20 from the other end side in the axial direction.

As described above, the transmission shaft 35 is rotatably surrounded by the cylindrical bearing case 20 on the outer side of the transmission shaft 35, and the first bearing 44
Is closed by a spigot portion 18a formed at the other end of the bank chamber casing 18, and the second bearing 45 is attached to the mounting plate 2
It is blocked by 2.

Then, the outer peripheral surfaces of the transmission shaft 35 are sealed by the rubber seals 48, 50 fitted to the inner peripheral surfaces of the spigot portion 18a and the mounting plate 22, respectively.

Here, the bearing case 20 shows an example of the "transmission mechanism casing" in the gist of the present invention.

Further, the screw 26 and the transmission shaft 35 that is coaxially connected to the base portion 30 of the screw 26 constitute an example of "an extrusion shaft that extends linearly from one end to the other end in the axial direction" in the gist of the present invention. There is.

A rubber seal in which the screw portion 28 surrounds the “screw body portion” in the gist of claims 1 and 2 of the present invention in the bearing case 20 of the transmission shaft 35.
A portion 37 between the rubber seal 50 and the rubber seal 50 is the "transmission shaft portion" in the gist of the present invention, and a portion 36 located between the "screw body portion 28" and the "transmission shaft portion 37" is the present invention. The "intermediate shaft portion" in the gist of claims 1 and 2 is configured.

As is apparent from FIG. 1, the bank chamber casing 18 has a length substantially the same as the base portion 30 of the screw 26 and an outer diameter substantially the same as the bearing case 20. In this example, such a bank chamber casing 18 is arranged concentrically with the bearing case 20 with bolts 51.
A bank chamber 52, which will be described later, is formed in a cylindrical space having a relatively large volume between the bank chamber and the space 35.

Specifically, as shown in FIGS. 3 and 4, the bank chamber casing 18 includes a front annular portion 53, a rear annular portion 54, and a plurality of connecting outer peripheral portions thereof ( It is configured in a tubular shape from three (here, three) connecting portions 56, and a sufficiently large opening window 57 is provided between the connecting portions 56. And here, as shown in the drawing, a plurality of bolt insertion holes 58 are formed in the front annular portion 53 and the rear annular portion 54, respectively,
As shown in FIG. 1, the bolt 51 for connecting the pushing cylinder 10 and the bearing case 20 has the through holes 58.
The bank chamber casing 18 is fixed concentrically with the bearing case 20 by being inserted into.

Here, a small-diameter seal holding portion 62 is integrally formed on the inner peripheral portion of the rear annular portion 54 of the bank chamber casing 18, and the rubber seal 48 is arranged on the inner peripheral surface of the seal holding portion 62. And this rubber seal 48 is a ridge 64 on the outer peripheral surface of the transmission shaft 35.
It is designed to be in sliding contact with the outer peripheral surface.

On the other hand, as shown in FIG. 1, an annular bank can be formed on the outer peripheral surface of the intermediate shaft portion 36 by the extruded material leaking between the slit base portion 74 of the screw 26 and the extrusion cylinder 10. Sufficiently, one end extending portion 36a having a predetermined axial length is separated from one axial end of the intermediate shaft portion 36, and the rear end is located in the bank chamber 51 toward the rear side. A disk-shaped annular plate 66 extending inward is fitted and fixed to the intermediate shaft portion 36 at a boss portion 68 on the back side. Thus, on the front surface side of the annular plate 66, an annular surface 70 is formed over the entire circumference of the transmission shaft 36 so as to extend outward from the outer peripheral surface thereof at a predetermined height in the direction perpendicular to the axis. Incidentally, 72 is a spacer.

Here, the annular plate 66 constitutes an example of the “collar-shaped dam member” in the gist of the present invention.

When the extruding material such as rubber is extruded in the apparatus of this example, the extruding material is supplied from the hopper attached to the hopper flange 14 into the extruding cylinder 10 through the material supply port (not shown), and the screw 26 is moved to the hydraulic motor. Rotate forward at 24. By doing so, as in the conventional apparatus, the extruded material supplied from the material supply port into the extrusion cylinder 10 is moved forward in the extrusion cylinder 10 by the forward rotation operation of the screw 26, and the extruded material is discharged from the discharge port at the tip. Is ejected. Then, depending on the rubber material, pressure acts on the extruded material in the cylinder, and the extruded material moves to the transmission shaft 36 side through the gap between the flight base 74 of the screw 26 and the extruding cylinder 10 as shown by the mark in FIG. invade.

When stopping the apparatus of this example on weekends or the like, in order to prevent seizure of material in the extrusion cylinder 10, the screw 26 is reversely rotated by the hydraulic motor 24, and the extruded material in the extrusion cylinder 10 is retracted. And take it out from the material supply port. When the screw 26 is reversely rotated in this manner, the screw 26 is rotated as shown by an arrow in FIG.
The extruded material enters the transmission shaft 35 through the gap between the flight base 74 and the extrusion cylinder 10, and is gradually sent to the rear, that is, the bearing case 20 side along the outer peripheral surface of the transmission shaft 35. However, in the case of the device of the present example, this extruded material hits the material blocking portion 70 on the front surface of the annular plate 66 mounted on the outer surface of the transmission shaft 35, is blocked by the material blocking portion 70, and the front side thereof is blocked. An annular bank that is easily peeled off is formed in a sufficiently large space portion, that is, a front side portion of the bank chamber 52. Therefore, the extruded material is prevented from moving rearward of the annular plate 66, that is, moving toward the bearing case 20.

Therefore, in the case of the device of this example, the extruded material blocked by the material dam 70 can be discharged to the outside through the window 57 formed between the connecting portions 56 of the bank chamber casing 18, and the extruded material can be received in the bearing chamber 46, and by extension. It is possible to reliably prevent entry into the hydraulic motor 24, and therefore it is possible to reliably prevent occurrence of a problem caused by entry of the extruded material into them.

Thus, in the extrusion apparatus of this example, the bearing chamber
It is possible to reliably and easily prevent the extruded material from entering the inside of the chamber 46, and to prevent the extruded material that has leaked out from the bank chamber.
52 The volume of the front portion is sufficiently large that the leaked extruded material is sufficiently cooled before it spreads to the annular surface 70 of the collar-shaped dam member 66, so that the leaked extruded material is It is possible to form an annular bank that is less likely to adhere to the annular surface 70 and that is easily peeled off around the outer periphery of the one-end extending portion 36a of the intermediate shaft portion 36.

In the extrusion apparatus of this example, as shown in FIG. 1, a discharge hole 76 similar to the conventional one is provided in front of the bank chamber 52, and the discharge base 76 between the flight base 74 of the screw 26 and the extrusion cylinder 10 is provided. A part of the extruded material that has entered the transmission shaft 35 side is discharged from the discharge hole 76 to the outside. Therefore, the amount of the extruded material discharged from the discharge hole 76 is advantageous in that the bank speed of the extruded material with respect to the bank chamber 52 and, consequently, the interval at which the extruded material is taken out from the window 57 of the bank chamber casing 18 can be lengthened.

Although the embodiment of the present invention has been described above, the present invention is not limited to this.

For example, in the previous example, the transmission shaft 35 is separate from the screw 26, but the transmission shaft and the screw 26 may be integrated.

Further, in the previous example, the present invention was applied to a direct drive type extrusion device in which the screw 26 is directly driven to rotate by the hydraulic motor 24 via the transmission shaft 35, but the present invention applies the screw to a gear or the like by a drive device. The present invention can also be applied to an indirect drive type extrusion device that is indirectly driven via a predetermined power transmission mechanism. In this case, the power transmission mechanism constitutes another embodiment of the "transmission mechanism casing" in the gist of the present invention.

The present invention can be configured in a form in which various modifications are made based on the knowledge of those skilled in the art without departing from the spirit of the present invention, such as adopting various configurations as the annular plate 66 and the bank chamber casing 18.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part of an extrusion apparatus that is an embodiment of the present invention, FIG.
FIG. 4 is a front partial cutaway view of the bank chamber casing in the same apparatus, and FIG. 4 is a left side partial cutaway view of the bank chamber casing. FIG. 5 is an explanatory view of a conventional example. 10: Extrusion cylinder 18: Bank chamber casing 20: Bearing case 24: Hydraulic motor, 26: Bearing chamber 36: Transmission shaft, 44: First bearing 45: Second bearing, 46: Bearing chamber 52: Bank chamber, 57 : Opening window 66: Annular plate, 70: Annular surface

Claims (3)

(57) [Claims] (A) A screw body portion formed on one end side in the axial direction, a transmission shaft body portion formed on the other end side in the axial direction, and a continuous portion between the screw body portion and the transmission shaft body portion. (B) an extrusion cylinder that rotatably holds the screw body portion on the outer circumference of the screw body portion; ) A first bearing that rotatably supports one side of the transmission shaft body in the axial direction, and (d) a second bearing that rotatably supports the other side of the transmission shaft body in the axial direction. And (e) a transmission mechanism casing that includes a first holding hole that holds the first bearing and a second holding hole that holds the second bearing, and that allows the transmission shaft to rotate. (F) Surrounding the intermediate shaft portion with a hole penetrating in the axial direction on the outer circumference A cylindrical bank chamber casing extending in the axial direction in which the pushing cylinder and the transmission mechanism casing are coaxially connected to the first holding hole; and (g) a screw on the outer periphery of the intermediate shaft body portion. In order to reliably prevent the extruded material that has leaked from the rear end side of the shaft body portion toward the intermediate shaft body portion to move to the transmission shaft body portion rearward of the surface extending in the radial direction of the dam member, It has an annular surface, which is fitted to the axial body of the shaft portion at one end extending from the one end in the axial direction with a predetermined length in the axial direction and extends outward in the direction substantially perpendicular to the axis by a predetermined radial length. A collar-like damming member and (h) the predetermined axial length and the predetermined radial length due to the one-end extending portion and the annular surface in a hole penetrating the tubular bank chamber casing in the axial direction. And the outside of the bank chamber formed by And an opening window provided in the bank chamber casing that penetrates through and a rotation drive device for rotating the transmission shaft body portion rotatably connected to the transmission shaft body portion. Extrusion device, characterized in that a hole passing through the axial direction of the cylindrical bank chamber casing is formed so as to essentially form only the bank chamber. (A) A screw body portion formed on one end side in the axial direction, a transmission shaft body portion formed on the other end side in the axial direction, and the screw body portion and the transmission shaft body portion are continuously connected to each other. An extruding shaft linearly extending from one end to the other end in the axial direction consisting of an extending intermediate shaft part, and (b) an extruding cylinder in which the screw body part is rotatably held on the outer periphery of the screw body part. A first bearing that rotatably supports one end side of the transmission shaft body in the axial direction; and (d) a second bearing that rotatably supports the other end side of the transmission shaft body in the axial direction. Bearing and (e) the transmission shaft, which is provided with a first holding hole for holding the first bearing detachably in one axial direction and a second holding hole for holding the second bearing. Rotatably and relatively toward the one axial end of the body A transmission mechanism casing that is detachably accommodated in the second bearing and (f) a hole that penetrates in the axial direction is provided, and the space between the extrusion cylinder and the transmission mechanism casing that surrounds the outer periphery of the intermediate shaft portion is provided. A cylindrical bank chamber casing that extends in the axial direction and is coaxially connected to the push-out cylinder and the first holding hole of the transmission mechanism casing, and (g) a screw is provided on the outer periphery of the intermediate shaft body portion. In order to reliably prevent the extruded material that has leaked from the rear end side of the shaft body portion toward the intermediate shaft body portion to move to the transmission shaft body portion rearward of the surface extending in the radial direction of the dam member, An annular surface that is fitted to one end of the shaft portion in the axial direction with one end extending portion having a predetermined axial length and that extends substantially outward in the direction perpendicular to the axis and has a predetermined radial length. A collar-shaped dam member and (h) the cylindrical bar A bank chamber formed by the one end extending portion and the annular surface with the predetermined axial length and the predetermined radial length in a hole penetrating the chamber housing in the axial direction; and (b) the bank. An opening window provided in the bank chamber casing that penetrates the chamber and the outside, and (n) a rotation drive device for rotating the transmission shaft body portion rotatably connected to the transmission shaft body portion. Extrusion device characterized by being. 3. (a) A screw having a screw portion on one end side in the axial direction and a base portion on the other end side; (b) an extrusion cylinder in which the outer circumference of the screw is rotatably held; and (c) one end side in the axial direction. A transmission shaft that is coaxially connected to the base of the screw, extends coaxially from the base and is separable from the screw, and (d) rotates one end side of the transmission shaft in the axial direction. A first bearing that movably supports; (e) a second bearing that rotatably supports the other axial end of the transmission shaft; and (f) a first holding hole that holds the first bearing. And a second holding hole for holding the second bearing, which rotatably accommodates the transmission shaft, and (g) an outer circumference of the transmission shaft on one end side in the axial direction. Surrounding with a hole that penetrates in the direction, A cylindrical bank chamber casing extending in the axial direction, wherein the pushing cylinder and the first holding hole of the transmission mechanism casing are coaxially connected to each other so that the pushing cylinder and the transmission mechanism casing can be removed. Ensure that the extruded material that has leaked from the rear end side of the screw shaft part to the intermediate shaft part side on the outer periphery of the transmission shaft moves to the transmission shaft part rearward of the surface extending in the radial direction of the dam member. For preventing, a predetermined radial length is provided outwardly in a direction substantially perpendicular to the axis, which is fitted to one end of the transmission shaft in the axial direction with one end having a predetermined axial length separated. A collar-shaped dam member having an annular surface extending with (i) a predetermined axial length defined by the extending portion and the annular surface in a hole penetrating in the axial direction of the tubular bank chamber casing. A bar formed with the predetermined radial length. And (u) an opening window provided in the bank chamber casing penetrating the bank chamber and the outside, and (l) a rotation drive device for rotating the transmission shaft, which is rotatably connected to the transmission shaft. And an extruder.