JP3320354B2 - Continuous twin-screw kneader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a thermosetting resin,
The present invention relates to a continuous twin-screw kneader for kneading various foods, chemicals, and the like.

[0002]

2. Description of the Related Art In today's advanced industrial technology, when raw materials such as powders are kneaded, especially in raw materials containing highly filled fillers (inorganic substances), not only the dispersibility but also the As a kneader for continuously agitating and kneading them during the crushing, a twin-screw kneader is particularly optimal.

The twin-screw kneader will be described with reference to FIGS. 1 and 2 which show an embodiment of the present invention. ,
In general, the object to be processed a is fed into the casing 10 from the inlet 11 at one end of the casing 10, kneaded by the kneading shaft 20, and the product b is discharged from the outlet 12 at the other end of the casing 10.

In this kneader, when kneading a thermosetting resin or the like, a gas (volatile matter / air) is generated with the kneading. This gas causes pinholes and voids (voids) in the product to cause deterioration of the properties. Therefore, in order to obtain a product of high quality and stable properties, the gas must be appropriately discharged.

For this reason, an exhaust port is conventionally provided in the casing 10, and gas is exhausted from the exhaust port. However, usually, the exhaust is performed by suction, and the inside of the casing 10 is decompressed, so that the object to be treated a also reaches the exhaust port together with the exhaust and is stored in the exhaust port.
That is, vent up occurs. When this vent-up occurs, the gas is difficult to be discharged, and the gas is mixed into the object to be processed a, thereby causing the property of the product b to deteriorate.

[0006] As a technique for eliminating this vent-up, Japanese Utility Model Laid-Open Publication Nos. 3-86034 and 86035 disclose a technique in which a rotating shaft is stretched at the end of stirring (kneading) and a stirring portion is provided at the stretched portion. Without attaching a plate (paddle), the outer peripheral portion of the extended portion is covered with a cylindrical container portion, and the cross section of the cylindrical container portion is kneader container portion (casing 1).
It is shown that the cross section of the cylindrical container portion is made larger than the cross section of the casing so that venting is eliminated and the gas in the casing is smoothly discharged as the same as the cross section of 0). .

[0007]

The technique of enlarging the cross section of the cylindrical container cannot prevent the object to be processed a from leaking into the container, and the leaked object to be processed a (product b) cannot be prevented.
Accumulates and causes vent up. In addition, the technology provided with the weir plate does not guarantee that the object to be processed a does not leak out beyond the weir plate in the cylindrical container part, and the same problem occurs. Further, the cylindrical container must be disassembled for removing the deposits, and the operation is complicated.

In particular, in recent years, with the advancement of technology, for example, a thermosetting resin is required to have a low-viscosity molten resin. Are easy to move, increasing the possibility of venting up. For this reason, there is a demand for exhaust that effectively prevents vent-up. Further, in order to obtain the smooth exhaust, it is necessary to clean the exhaust port, and the smooth workability is required.

A first object of the present invention is to effectively prevent entry of an object to be treated into an exhaust port to prevent vent-up, and a second object to facilitate cleaning of an exhaust port. And

[0010]

SUMMARY OF THE INVENTION In order to achieve the first object, the present invention is directed to an apparatus for exhausting gas through a gap in a kneading shaft penetrating portion of an end plate and for removing an object to be introduced into the gap. In addition to being pushed back, the processing object that has entered the gap is discharged while securing an exhaust path.
Since the gap can be relatively narrowed by the pushing back action of the workpiece and the action thereof, the workpiece reaching the exhaust port through the gap is reduced as much as possible, and venting of the exhaust port is effectively prevented. Is done.

In order to achieve the second object, the present invention enables the end plate to be easily pulled out from the kneading shaft. If it can be easily pulled out, it is easy to clean the exhaust port such as the through portion.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to achieve the first object, as an embodiment, both end surfaces of a cylindrical casing are closed with end plates, and the end plates are penetrated so that a kneading shaft in the cylindrical axis direction is formed in the casing. Continuous twin-screw kneading in which the object to be processed is fed into the casing from one end of the casing, kneaded by the kneading shaft, the product is discharged from the other end of the casing, and gas generated in the casing is exhausted. In the machine, the kneading shaft has a reverse screw that pushes the object to be processed toward the exhaust port at the inner end of the casing, and a sleeve is fitted and fixed to a penetrating portion of the kneading shaft of the end plate facing the reverse screw,
A spiral groove or spiral ridge in the axial direction is formed on the outer surface of the sleeve, and a gap is formed between the sleeve and the inner surface of the through hole of the end plate of the sleeve. In addition to providing a storage space for the processed object, an exhaust port may be provided above the rear portion of the sleeve.

[0013] With this configuration, the workpiece to be intruded into the through-hole by the reverse screw is pushed back, and the one that intrudes into the through-hole without being pushed back is rotated relative to each other in the gap between the sleeve and the end plate. Upon receiving the movement, it is separated (peeled) by the unevenness of the spiral groove or spiral ridge, and the exhaust path is secured and enters the storage space. At this time, if the spiral groove and the spiral ridge are twisted in the direction in which the object is sent back into the casing, the object to be processed is pushed back by the returning action, while if the object is twisted in the opposite direction, the object is returned to the storage space. Storage is promoted. In addition, when the object to be processed is a thermosetting resin or a material containing a large amount thereof, the object is solidified by the frictional heat of the relative rotational motion or the like, so that the dividing action by the groove or the ridge becomes smoother.

The discharge-side end plate is detachably attached to the casing, and a support sleeve is detachably fitted to a kneading shaft extending from the sleeve, and the support sleeve is rotatable on a bearing integrated with the end plate. In this configuration, the end plate is removed from the kneading shaft by pulling out the support sleeve from the kneading shaft after removing the supporting sleeve from the kneading shaft, which facilitates inspection and cleaning. That is, the second task is achieved.

At this time, a guide rail may be provided along the kneading shaft, the end plate may be movably mounted on the guide rail, and the end plate may be moved along the guide rail so that the end plate can be removed from the kneading shaft. .

[0016]

An embodiment is shown in FIGS. 1 to 8, in which two kneading shafts 20, 20 extending in the cylinder axis direction are provided between end plates 1, 2 in a cylindrical casing 10. As shown in FIG. Yes,
By a driving device not shown, both kneading shafts 20, 20 are rotated clockwise in the same direction, for example, rightward in FIG. A jacket 14 composed of mutually communicating chambers is formed on the outer peripheral surface of the casing 10, and a heating medium is circulated in the jacket 14 to maintain the inside of the casing 10 at a constant temperature. In the figure, reference numeral 13 denotes a wear-resistant liner provided on the inner surface of the casing 1.

The kneading shaft 20 extends from the inlet 11 to the outlet 1
Feed screw 20a and paddle 20 toward the second side
b, a reverse screw 20c is sequentially attached to the outer periphery thereof, and the workpiece a is extruded while being stirred by the feed screw 20a, is stirred and kneaded by the paddle 20b, and is pushed back and discharged by the reverse screw 20c. The workpiece a (product b) is prevented from entering the end plate 2 on the side. Due to this intrusion preventing action, the reverse screw 20c is reversely twisted with the feed screw 20a and the paddle 20b.
For example, the feed screw 20a and the paddle 20b are twisted left, and the reverse screw 20c is twisted right.

The discharge end plate 2 is provided with a clamp device 30. This clamping device 30 is similar to that shown in FIG.
8, a guide shaft 32 a, 32 b and a hydraulic cylinder 33 shown in FIG. 8. The hydraulic cylinder 33 is fixed to the clamp member 31.
As shown in FIG. 6, the two guide shafts 32a and 32b are fitted into the recess
1 is slidably penetrated, and a rod of a hydraulic cylinder 33 is screwed and connected to one guide shaft 32b. Therefore, when the rod of the hydraulic cylinder 33 expands and contracts with the end plate 2 fitted to the casing 10, the member 3
1 is fitted or detached from the side edge of the casing 10 and the end plate 2, and the fitting firmly presses the casing 10 and the end plate 2 by the fitting, and the detachment allows the end plate 2 to be separated from the casing 10. (See FIG. 4).

The end plate 2 on the discharge side can be moved in the left-right direction by a linear guide 40 on a frame F of the apparatus, and the linear guide 40 is covered with a bellows-like cover (omitted), and To prevent intrusion. Further, the end plate 2 has through holes 51 and 52 communicating with the inner surface in the upper and lower directions, and the upper through hole 51 is a gas vent, and a pump (not shown) is connected to the opening 51, Appropriate decompression is performed in the casing 10. The lower through hole 52 is an inspection port, and is covered with a transparent plate 52a.

A return sleeve 53 is provided on the inner surface of the end plate 2 and fitted integrally with the kneading shaft 20 in the direction of rotation by means of a key 20d. The sleeve 53 is formed by screwing a stop ring 53a onto the shaft 20. The shaft 20 prevents it from falling off. A thread groove 53b in the same direction as the reverse screw 20c is formed on the outer peripheral surface of the sleeve 53, and the workpiece a passing through the reverse screw 20c is pushed back by the screw groove 53b, and the workpiece a
Is a thermosetting resin, it solidifies and falls into the inspection port 52 soon.

The bearing portion of the end plate 2 comprises a bearing sleeve 54, various packings 55 and pressers 56, and a bearing 58 is provided on the rear side of the end plate 2 via a support plate 57. The bearing 58 rotatably supports the sleeve 54 via a bearing 58a. The sleeve 54 is screwed to the shaft 20 by a screw 54a, and a tightening sleeve 59 is screwed to the rear end. The sleeve 59 is fixed to the bearing 58a by the sleeve 59, so that the bearing 58, the end plate 2 and the sleeve 54 are fixed. Become one. In the figure, 60 is the axis 20
This is a pipe (rotary joint) through which a heat medium passes, and is removed from the shaft 20 when the end plate 2 is extracted.

In this embodiment, the heat medium is flowed into the jacket 14 and the shaft 20 to maintain the inside of the casing 10 at a constant temperature at which the material to be processed a becomes liquid without solidifying, The powdered thermosetting resin a to be processed is fed from the inlet 11 in a state where suction and exhaust are performed so that the degree of pressure reduction in the casing 10 becomes 20 to 100 Torr (20 to 100 mmHg) through the port 51. The processed material a is stirred and kneaded by the kneading shaft 20 and is taken out from the outlet 12 as a fluid (liquid) product b.

At the time of the kneading operation, the workpiece a sent while being kneaded in the casing 10 is pushed back to the outlet 12 by the reverse screw 20c, and most of the material is smoothly discharged as the product b. The processing object a slightly coming out of the reverse screw 20c is a sleeve 53
Adhered to the peripheral surface, gradually solidified due to frictional heat between the inner surface of the through hole of the end plate 2 and the sleeve 53 due to the rotation of the sleeve 53, and the solidified workpiece a is peeled off due to the unevenness of the groove 53b for inspection. It falls into the space of the mouth 52. This falling object is checked periodically or through the transparent plate 52a and removed as appropriate.

When the operation is completed, first, after removing the rotary joint 60, the clamp device 30 is opened (the member 31 is retracted). Then, the bearing sleeve 54 is loosened by its fixing screw 54a, and the kneading shaft 20 is loosened. , The support plate 57 and the end plate 2 are slid over the linear guide 40 together with the sleeve 54 to remove it from the kneading shaft 20 as shown in FIG.
1. Inspection and cleaning of the discharge port such as the inspection port 52 is performed.

When the inspection and cleaning are completed, the end plate 2 is returned by the reverse action and fitted to the kneading shaft 20, and the sleeves 54 and 59 are fixed to the shaft 20, and the casing 10 and the end plate 2 are clamped by the clamping device 30. Is crimped, and the piping 60 is reset. This inspection
The cleaning operation is performed by the hydraulic cylinder 33 on the casing 10.
End plate 2 mechanically fits and separates from
Since the end plate 2 is smoothly moved by the linear guide 40, it can be performed by one operator.

In the kneading of the low-viscosity molten resin for obtaining the above-mentioned high quality and stable properties according to this embodiment, a desired one could be obtained.

[0027]

According to the present invention, the exhaust is performed from the rear of the end plate, and the intrusion of the object into the exhaust passage of the end plate is effectively prevented, and the intruder is removed. Without vent up,
Stable degassing can be performed. In addition, since the exhaust port portion can be easily removed from the kneading shaft, the inspection and cleaning thereof are also easy.

[Brief description of the drawings]

FIG. 1 is a cutaway front view of a main part of the embodiment.

FIG. 2 is an enlarged view of a main part of FIG. 1;

FIG. 3 is an explanatory diagram of an operation.

FIG. 4 is a plan view of a main part of the embodiment, which is partially omitted.

FIG. 5 is a partially cutaway left side view of the discharge-side end plate.

FIG. 6 is a cutaway plan view of a main part of FIG. 5;

FIG. 7 is a perspective view of a U-shaped clamp member of the clamp device.

FIGS. 8A and 8B both show a guide shaft of a clamp device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 drive side end plate 2 discharge side end plate 10 casing 11 input port 12 discharge port 20 kneading shaft 20 a feed screw 20 b paddle 20 c reverse screw 30 clamping device 31 U-shaped clamp member 33 hydraulic cylinder 40 linear guide 51 gas vent 52 Inspection port 53, 54, 59 Sleeve 53a Stop ring 53b Spiral groove a Workpiece b Product

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B01F ⁷ /00-7/32 B01F 15/00 B29B 7/48 B29B 7/84

Claims (1)

(57) [Claims] 1. Both end surfaces of a cylindrical casing 10 are closed by end plates 1 and 2, and two kneading shafts 20 in the cylinder axis direction are passed through the end plates 1 and 2 into the casing 10, Input port 1 at one end of the casing 10
1 is fed into the casing 10 and kneaded by the kneading shaft 20 to discharge the other end of the casing 10.
The product b is discharged from the outlet 12 and the gas generated in the casing 10 is supplied to the exhaust port 5 provided in the end plate 2.
In the continuous twin-screw kneader for exhausting from 1, the kneading shaft 20 has a reverse subscription <br/> oxalic 20c to push back the object to be treated a in the casing 10 end toward the discharge port 12, the Reverse A sleeve 53 is fitted and fixed to the penetrating portion of the kneading shaft 20 of the end plate 2 facing the screw 20c, and an axial spiral groove 53b or a spiral ridge is formed on the outer surface of the sleeve 53. End plate 2
A gap e is formed between the inner surface of the through hole and the storage space 52 for the workpiece a that has passed through the through hole at the lower part of the rear part of the sleeve 53, and the exhaust port 51 is provided at the upper part of the rear part of the sleeve 53. Te performs the exhaust from the exhaust port 51 through the gap e, and an object to be processed a attempting to break into the gap e
The workpiece a that has been pushed back by the reverse screw 20c and has entered the gap is removed by the sleeve 53.
A continuous twin-screw kneader characterized in that an exhaust path is secured and discharged by a feeding action of a spiral groove 53b or a spiral ridge .