JP2009067000A - Twin-screw extrusion molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a twin-screw extrusion molding machine in which a material to be treated is kneaded, compressed, and transferred in a transfer space by mesh rotation of a pair of screw shafts, discharged from a plurality of discharge port parts of a dies plate, the material to be treated is heated with a reduction in volume by frictional resistance due to the kneading, compression, and transfer in the transfer space and the dies plate, the material to be treated is solidified and molded to be discharged from the discharge port part, the screw shaft can be supported by a bearing parts in a both-end supported state, a large load is withstandable, and the material to be treated can be prevented from being leaked to an external part by a cover member. <P>SOLUTION: The twin-screw extrusion molding machine includes the casing 1, a pair of screw shafts 5, a drive mechanism 7, and the dies plate 11 having a plurality of discharge ports 12, wherein projection parts 5c, 6c projecting from the dies plate are formed on the pair of screw shafts, a bearing part 14 composed of a plane bearing 16 for bearing the projection parts is provided, and the cover member 15 for covering the projection parts is provided on the dies plate. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is, for example, a biaxial screw type extrusion molding used for compressing, reducing, and solidifying an object to be treated such as a general city waste containing a polymer and an industrial waste such as a waste plastic discharged from a business office. Related to the machine.

Conventionally, as this type of twin-screw type extruder, a casing in which an input portion for a workpiece is provided on one side and a discharge portion is provided on the other side, and a spiral blade portion in the casing are mutually connected. A pair of screw shafts arranged rotatably in an overlapping state, a drive mechanism for rotating the pair of screw shafts in the occlusal direction, and a kneading compression transfer by the occlusal rotation of the pair of screw shafts. 2. Description of the Related Art There is known a structure composed of a die plate having a plurality of discharge ports for discharging a workpiece to be processed.
Japanese Patent No. 3921614

  However, in the case of the conventional structure, the workpiece is kneaded and compressed and transferred in the transfer space between the inner peripheral surface of the casing and the blades by the occlusal rotation of a pair of screw shafts. At this time, a large load is applied to the screw shaft, and even if the drive side bearing portion and the tip end side bearing portion are supported in a supported state by this load, the screw shaft will rotate centering. If the ball bearing is used as the bearing on the tip side, the bearing may be severely damaged by a large load. The object to be processed may leak from the ball bearing to the outside, and the processing efficiency of the object to be processed may be reduced.

  The present invention aims to solve these disadvantages. Among the present inventions, the invention according to claim 1 is characterized in that an input portion for a workpiece is provided on one side and a discharge portion is provided on the other side. A pair of screw shafts that are rotatably arranged in a state where the spiral blade portions overlap each other in the casing, and a drive mechanism that rotates the pair of screw shafts in an occlusal direction. And a die plate having a plurality of discharge ports for discharging the object to be processed which is kneaded and compressed and transferred by occlusal rotation of the pair of screw shafts, the pair of screw shafts. A protrusion projecting from the die plate is formed on the die plate, and a bearing portion comprising a plain bearing for bearing the projection is provided on the die plate and a cover member covering the protrusion is provided. In biaxial screw type extrusion molding machine, wherein.

  The invention described in claim 2 is characterized in that a discharge nozzle having an appropriate length for solidification molding and an appropriate inner diameter is projected from the discharge port portion. The present invention is characterized in that a heater is provided on the die plate.

  As described above, according to the first aspect of the present invention, when an object to be processed is introduced into the casing from the input portion, the object to be processed is kneaded in the transfer space by the occlusal rotation of the pair of screw shafts in the casing. It is compressed and transferred, discharged from a plurality of outlets of the die plate, and heated while being reduced in volume by kneading compression transfer in the transfer space and frictional resistance by the die plate, The contained resin component is melted, the resin component becomes the binder, and the object to be processed is solidified and discharged from the discharge port. At this time, the pair of screw shafts are fed from the die plate. A projecting part is formed, and a bearing part comprising a plain bearing for bearing the projecting part is provided on the die plate and a cover member for covering the projecting part is provided. The screw shaft can be supported in a supported state by the receiver and the bearing portion, damage to the blade portion and the casing due to the rotation of the screw shaft can be suppressed, and power consumption can be reduced, and Since a plain bearing is used as the bearing on the tip side, it can withstand a large load, and the cover member can prevent the workpiece from leaking to the outside, improving the processing efficiency of the workpiece. be able to.

  Further, in the invention described in claim 2, since the discharge nozzle is provided with a discharge nozzle having an appropriate length and an inner diameter for solidification molding at the discharge port portion, it is possible to secure a cooling solidification molding time. The solidification of the object to be processed can be performed satisfactorily. In the invention according to claim 3, since the heater is provided on the die plate, the object to be processed can be reliably heated. it can.

  FIGS. 1 to 5 show an embodiment of the present invention. Reference numeral 1 denotes a casing, which is provided with an input portion 3 having an input port portion 2 for a workpiece W on one side and a discharge portion on the other side. 4 is provided, and a pair of screw shafts 5 and 6 are arranged in the casing 1 so as to be rotatable in parallel with mutually different spiral blade portions 5a and 6a overlapping each other. A transfer space T for the object to be processed W having a spiral shape is formed between the front end of 6a and the bottom surfaces 5b and 6b.

  Reference numeral 7 denotes a drive mechanism, which comprises a motor 8, a speed reducer 9, and a gear mechanism 10 with variable rotation speeds. The pair of screw shafts 5 and 6 are directed downward from above in the direction of the arrows in FIG. It is comprised so that it may rotate in the occlusion direction F which is a different direction rotation of the inward direction.

  A die plate 11 is provided in the discharge part 4 of the casing 1 and has a plurality of discharges for discharging the workpiece W which is kneaded and compressed and transferred by the occlusal rotation of the pair of screw shafts 5 and 6 in the arrow direction. An outlet 12 is provided.

  In this case, a mounting hole 12a having an inner diameter D is formed in the discharge port portion 12 of the die plate 11, and a discharge nozzle 13 having an appropriate length L and an inner diameter d for solidification molding is detachably protruded from the mounting hole 12a. In addition, the discharge nozzles 13 having different lengths having the length L and the inner diameter d are provided so as to be detachable and changeable with a common outer diameter matching the inner diameter D of the mounting hole 12a.

  14 is a bearing portion, and 15 is a cover member. The pair of screw shafts 5 and 6 are formed with protruding portions 5c and 6c protruding from the die plate 11, and the protruding portions 5c and 6c are bearing on the die plate 11. A cover member 15 including a plain bearing 16 is provided, and a cover member 15 that covers the projecting portions 5 c and 6 c is attached by a bolt 17.

  In this case, the die plate 11 is provided with a heater 18 and a thermocouple 19.

  Since this embodiment has the above-described configuration, when the workpiece W is thrown into the casing 1 from the throwing portion 3, the workpiece W is transferred into the transfer space by the occlusal rotation of the pair of screw shafts 5 and 6 in the casing 1. The workpiece W is kneaded and compressed and transferred from the plurality of discharge ports 12 of the die plate 11, and the workpiece W is heated while being reduced in volume by the kneading and compression transfer in the transfer space T and the frictional resistance by the die plate 11. By this heating, the resin component contained in the workpiece W is melted, the resin component becomes a binder, and the workpiece W is solidified and discharged from the discharge nozzle 13 of the discharge port portion 12 and discharged. Become.

  At this time, a protrusion that protrudes from the die plate is formed on the pair of screw shafts, a bearing portion that includes a plain bearing that supports the protrusion is provided on the die plate, and a cover member that covers the protrusion is provided. Therefore, the screw shafts 5 and 6 can be supported by the bearing on the drive mechanism 7 side and the bearing portion 14 in a state of being supported by both ends, and the blade portions 5a and 6a and the casing 1 of the casing 1 due to the rotation of the center of the screw shafts 5 and 6 can be supported. Damage can be suppressed and power consumption can be reduced, and the flat bearing 16 is used as the bearing on the tip side, so that it can withstand a large load. Can be prevented from leaking to the outside, and the processing efficiency of the workpiece W can be improved.

  Further, in this case, since the discharge nozzle 13 having an appropriate length L and an inner diameter d for solidification molding protrudes from the discharge port portion 12, it is possible to ensure the cooling solidification molding time, and to be processed Solidification molding of W can be performed satisfactorily. In this case, since the heater 15 is provided on the die plate 11, the workpiece W can be reliably heated.

  The present invention is not limited to the above embodiment, but the shape and size of the casing 1 and screw shafts 5 and 6, the structure of the drive mechanism 7, the material and size of the plain bearing 16, and the cover member 15, The structure and the like of the discharge port part 12, the discharge nozzle 13, and the bearing part 14 are appropriately changed and designed.

  As described above, the intended purpose can be sufficiently achieved.

1 is an overall side view of an embodiment of the present invention. It is a partial plane sectional view of the example of an embodiment of the invention. It is a fragmentary sectional side view of the example of an embodiment of the invention. It is a partial side view of the embodiment of the present invention. It is a partial expanded side sectional view of an example of an embodiment of the invention.

Explanation of symbols

W Workpiece 1 Casing 2 Input port portion 3 Input portion 4 Discharge portion 5 Screw shaft 5a Blade portion 5c Projection portion 6 Screw shaft 6a Blade portion 6c Projection portion 11 Die plate 12 Discharge port portion 13 Discharge nozzle portion 14 Bearing portion 15 Cover member 16 Plain bearing 18 Heater

Claims (3)

  A casing in which a workpiece input portion is provided on one side and a discharge portion is provided on the other side, and a pair in which the spiral blades are rotatably arranged in parallel with each other in the casing. A screw shaft, a drive mechanism for rotating the pair of screw shafts in the occlusal direction, and a discharge portion of the casing, and discharging the workpiece to be kneaded and compressed by the occlusal rotation of the pair of screw shafts A die plate having a plurality of discharge ports is formed. The pair of screw shafts are provided with a protruding portion protruding from the die plate, and the die plate is provided with a bearing portion comprising a plain bearing for bearing the protruding portion. A twin screw type extrusion molding machine comprising a cover member that covers the protruding portion.   2. A twin screw extruder according to claim 1, wherein a discharge nozzle having an appropriate length for solidification molding and an appropriate inner diameter is provided at the discharge port. The twin-screw type extruder according to claim 1 or 2, wherein a heater is provided on the die plate.

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