JP7032851B1 - Oil squeezing and pelletizing equipment and oil squeezing and pelleting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil-squeezing / pelletizing device and an oil-squeezing / pelletizing method for squeezing oil-containing solid materials while continuously transporting them, and making the solid materials after oiling into pellet products on the spot for reuse. do. SOLUTION: A supply unit having a rotating shaft extending in the longitudinal direction of the barrel and a screw element externally fitted to the rotating shaft in the barrel and supplying an oil-containing solid material into the barrel. An oil squeezing section that squeezes oil from an oil-containing solid material supplied by the supply section, an oil recovery section that recovers the squeezed oil, and a melting point or oil tolerance of the solid material before being squeezed by the oil squeezing section. A heating unit is provided to heat the oil-containing solid material so that it is in a softened state to a temperature lower than the lower of the heating temperatures. A screw element, the oil recovery unit is provided laterally with respect to the longitudinal direction of the barrel so that only the squeezed oil accumulated in the lower part of the barrel can be recovered. An oil outflow opening is provided in the vicinity of the squeezing screw element, and an extruding portion for extruding the solid material after squeezing is provided on the downstream side of the squeezing portion. An oil squeezing and pelletizing apparatus characterized in that a melting portion for heating a solid material to a molten state is provided, and the solid material extruded to the outside in a strand shape by the extrusion portion is cut into a pellet product. [Selection diagram] Fig. 1

Description

The present invention relates to an oil squeezing / pelleting apparatus and an oil squeezing / pelleting method. The present invention relates to an oil-squeezing and pelletizing device and an oil-squeezing and pelletizing method that can be reused.

Conventionally, oil content has been recovered by oil extraction technology for natural products such as plants or artificial products such as foods and industrial products.
For example, as disclosed in Patent Document 1, a technique has been used in which an object to be squeezed is placed in a container and squeezed in a batch manner to squeeze the oil.
More specifically, it is configured to put the object to be squeezed in a container, squeeze it in the container, separate it into oil and solid, and collect the squeezed oil, and statically squeeze the object to be squeezed. Oil is squeezed by squeezing.
According to such a technique, it is possible to reliably squeeze the oil-squeezed object in the container, but after recovering the squeezed object and the squeezed oil in the container, the next squeezed object is used. It is inefficient in that it needs to be put in a container and continuous oil extraction is not possible.

In this regard, for example, Patent Document 2 and Patent Document 3 disclose techniques for extracting oil from seeds for recovery of vegetable oil by using an extruder.
In Patent Document 2, as a so-called extruder, a rotating shaft extending in the longitudinal direction of the barrel and a screw element externally fitted to the rotating shaft are provided in the barrel, and an oil-containing solid material is supplied into the barrel. A supply unit, an oil extraction unit that squeezes oil from the oil-containing solid material supplied by the supply unit, and a heating unit that heats the oil-containing solid material before being squeezed by the oil extraction unit are provided. In the downstream part, oil is squeezed from seeds by applying back pressure to the material with a reverse feed screw.

In Patent Document 3, as in Patent Document 2, using a so-called extruder, a rotating shaft extending in the longitudinal direction of the barrel and a screw element externally fitted to the rotating shaft are provided in the barrel. , The supply unit that supplies the oil-containing solid material into the barrel, the oil extraction unit that squeezes the oil from the oil-containing solid material supplied by the supply unit, and the oil-containing solid material that is heated until it is squeezed by the oil extraction unit. A heating section is provided, and in the most downstream section, oil is squeezed from seeds by applying back pressure to the material using a pressure regulator.

In particular, in common with Patent Documents 2 and 3, a biaxial isodirectional extruder is used, and screws are externally fitted to each of the biaxial rotating shafts extending in parallel in the axial direction at intervals in the barrel. However, by rotating the screw by rotating the biaxial rotating shaft in the same direction, it is possible to continuously supply the object into the barrel and continuously convey the object in the axial direction.
However, if the object to be squeezed is squeezed by such a twin-screw co-extruder, while continuously transporting the object, shearing to the object generated at the meshing portion of the corresponding screws of each rotating shaft is performed. Although dynamic squeezing is possible to some extent by utilizing it, such shearing heats the object and, in some cases, causes thermal deterioration of the oil to be squeezed. In this respect, if the screw rotation speed is reduced in order to suppress the thermal deterioration of the oil content, the oil content recovery efficiency is lowered.
Furthermore, since the clearance between the screws is large, the self-cleaning property is poor, so that the solid material remains attached to the outer surface of the screw, and the heat-deteriorated solid material becomes foreign matter in the squeezed oil. There is also a risk of contamination.

In addition to the above, in such a conventional oil squeezing technique, the oil-containing solid material is continuously supplied from the supply unit, and the oil is squeezed while being conveyed in the longitudinal direction of the barrel by the rotation of the screw element, so that it is continuous. Although it is possible to squeeze oil, it does not target oil-containing solid materials as substances that melt by heat, and has the following technical problems.
Originally, as long as plant seeds are targeted, slags such as seed coats after oil extraction are not subject to reuse, but are subject to disposal as residues.
The oil recovered by oil extraction and the residue containing the seed coat from which the oil has been recovered have not been separated, and it is difficult to extrude only the object after oil extraction to the outside as it is on the downstream side. ..
As described above, in such a conventional oil extraction technique, for example, a thermoplastic resin such as a paraffin-containing polyethylene oil-containing solid material sheet and an oil-containing solid material of a similar substance are recovered while recovering the oil content. No suggestion or idea is made to make the fixed material made into an in-situ reusable product.

Utility model registration number 3195337 Japanese Patent Application Laid-Open No. 61-31496 Japanese Patent Application Laid-Open No. 07-19774

In view of the above technical problems, an object of the present invention is to squeeze oil while continuously transporting oil-containing solid materials, and to squeeze the squeezed solid materials on the spot into pellet products so that they can be reused. It is an object of the present invention to provide a dual-pelling apparatus and an oil-squeezing and pelletizing method.
In view of the above technical problems, an object of the present invention is to ensure high quality oil recovery by suppressing thermal deterioration, and to reuse the solid material after oil extraction as a pellet product on the spot. It is an object of the present invention to provide an oil-squeezing and pelletizing apparatus and an oil-squeezing and pelletizing method.

In order to solve the above problems, the oil squeezing and pelletizing apparatus of the present invention is used.
In the barrel, a rotating shaft that extends in the longitudinal direction of the barrel,
It has a screw element that fits externally to the rotating shaft, and has.
A supply unit that supplies the oil-containing solid material into the barrel, an oil-squeezing unit that squeezes oil from the oil-containing solid material supplied by the supply unit, an oil recovery unit that recovers the squeezed oil, and the oil-squeezing unit. A heating unit is provided to heat the oil-containing solid material so that it is in a softened state to a temperature equal to or lower than the melting point of the solid material or the allowable heating temperature of the oil before being squeezed.
In the squeezing portion, the screw element is a squeezing screw element capable of squeezing an oil-containing solid material.
The oil recovery unit is provided laterally with respect to the longitudinal direction of the barrel so that only the squeezed oil accumulated in the lower part of the barrel can be recovered, and the barrel is provided with the squeezing screw element. An oil outflow opening is provided in the vicinity,
Further, an extrusion section for extruding the solid material after oil extraction is provided on the downstream side of the oil extraction section.
In the vicinity of the extruded portion, a melting portion that heats the solid material after oil extraction to a molten state is provided.
The solid material extruded to the outside in a strand shape by the extruded portion is cut into a pellet product.
An oil squeezing and pelletizing device that is characterized by this.

According to the oil squeezing and pelletizing apparatus having the above configuration, the oil-containing solid material supplied from the supply unit into the barrel is heated while being conveyed to the downstream side in the longitudinal direction of the barrel by the rotation of the rotating shaft, that is, the screw element. The oil-containing solid material is heated to a softened state to a temperature lower than the melting point of the solid material or the allowable heating temperature of the oil content, and is squeezed by a squeezing screw element to be squeezed and recovered. Only the squeezed oil collected in the lower part of the barrel is recovered by the oil recovery section through the oil outflow opening, while the solid material after squeezing is collected in the extrusion section on the downstream side of the oil squeezing section. , It is melted by the melting part near the extrusion part, extruded to the outside in a strand shape, and cut to make a pellet product. Therefore, through the separation of the recovered oil and the recovered solid material, the oil-containing solid While oil is squeezed while continuously transporting the material, the solid material after oil extraction can be made into pellet products on the spot and reused.

Further, the barrel is a eyebrows shape in which two cylindrical cylinders are connected in parallel in the longitudinal direction and a pair of arc portions are connected in a cross section orthogonal to the longitudinal direction.
Each of the rotary shafts extends longitudinally concentrically with the cylindrical cylinder within the corresponding cylindrical cylinder.
It is a two-axis rotating shaft that can rotate in the same direction around the longitudinal direction and is separated from each other by a predetermined distance.
The screw elements are paired with each other and are fitted to each of the two-axis rotating shafts.
It is preferable that the pair of screw elements are the same as each other, are provided at the same position in the longitudinal direction of the barrel, and are arranged so as to mesh with each other at a predetermined distance between the rotating shafts of the two axes.

Further, the oil squeezing portion has a transporting portion and a squeezing portion arranged adjacent to each other in the longitudinal direction.
In the transport section, the pair of screw elements are transport screw elements capable of transporting an oil-containing solid material to the downstream side in the longitudinal direction of the barrel.
The flow path cross-sectional area of the oil-containing solid material formed between the outer surface of the squeezing screw element and the inner surface of the barrel is formed between the outer surface of the transport screw element and the inner surface of the barrel. It is preferable to set it smaller than the cross-sectional area of the flow path of the oil-containing solid material.

Furthermore, the squeezing screw element has a circular opening into which the rotating shaft fits, discs with two or more chips in the circumferential direction are stacked longitudinally, and the corresponding inserts of the discs adjacent in the longitudinal direction. Is a type that is discontinuous in the longitudinal direction and is offset in the circumferential direction, and the center of the circular opening may be offset with respect to the center of the barrel.
In addition, the squeezing screw element is monolithic with a circular opening into which the rotary shaft fits, with two or more tips in the circumferential direction on each of the longitudinally spaced end faces and on the peripheral side surface. Is a continuous type in the longitudinal direction in which spiral leads connected to the chips on both end faces are provided, and the center of the circular opening may be offset with respect to the center of the barrel.

Further, it is preferable that a plurality of the oil-squeezing portions are provided in series in the longitudinal direction of the barrel, and the extrusion portions are provided downstream of the oil-squeezing portion on the most downstream side.
Further, the oil recovery unit is provided with a casing that is communicated with the oil outflow opening and has an oil recovery opening, and a screw that is provided in the casing and rotates in a direction toward the oil outflow opening. The oil to be squeezed is recovered through the oil recovery opening, and the squeezed oil-containing solid material is not recovered.
Furthermore, as the oil-containing solid material, the solid material may be a thermoplastic resin.

In order to solve the above problems, the oil-squeezing and pelletizing method of the present invention is used.
The oil-containing solid material impregnated with oil in the solid material is continuously transported in the forward direction in the closed space along the extension direction of the closed space, and the lower of the melting point of the solid material or the allowable heating temperature of the oil is lower. At the stage of heating the oil-containing solid material to a softened state to below the temperature,
By forming a pressure barrier on the downstream side of the closed space, the oil-containing solid material is squeezed while increasing the filling degree of the heated oil-containing solid material in the closed space on the upstream side of the pressure barrier, and the oil content is squeezed only by squeezing. The stage of oil extraction and
At the stage of continuously recovering the squeezed oil, melting the squeezed solid material and pushing it out in a strand shape,
The stage of cutting the solid material extruded to the outside and pelletizing it,
It has a structure.

Further, in the pelletization step, it is preferable that the solid material extruded to the outside is air-cooled or water-cooled so that it can be cut at predetermined lengths in the longitudinal direction, and then cut.
Further, as the oil-containing solid material, the solid material may be a thermoplastic resin.

The oil-squeezing and pelletizing apparatus and the oil-squeezing and pelletizing method of the present invention will be described in detail below with reference to the drawings.
As shown in FIGS. 1 to 3, the oil squeezing and pelletizing apparatus 10 has a supply unit 22 for supplying the oil-containing solid material M into the barrel 16 and an oil content O from the oil-containing solid material M supplied by the supply unit 22. The temperature below the melting point of the solid material or the allowable heating temperature of the oil O before being squeezed by the oil squeezing unit 24 for squeezing the oil, the oil recovery unit 26 for recovering the squeezed oil O, and the oil squeezing unit 24. It is roughly composed of a heating unit 28 that heats the oil-containing solid material M up to, and an extrusion unit 33 that extrudes the residual solid material M that has been oil-squeezed with oil O to the outside.
More specifically, a barrel 16 for transporting the oil-containing solid material M is provided inside, and a cylinder 12 extending in the longitudinal direction X supported by the stand 25 is provided at appropriate intervals, and a supply is provided at one end of the cylinder 12. An extrusion portion 33 is provided at the other end of the portion 22 and the cylinder 12, an oil squeezing portion 24 and a heating portion 28 are provided in the longitudinal direction X from one end toward the other end, and the oil squeezing portion 24 is provided from the cylinder 12. An oil recovery section 26 is provided on the side in a direction orthogonal to the longitudinal direction X of the cylinder 12, and the oil-containing solid material M supplied from the supply section 22 is conveyed to the downstream side of the longitudinal direction X in the barrel 16. At the same time, the oil O that has been heated, squeezed, and squeezed is recovered, while the residual solid material M that has been squeezed with the oil O is pushed out.

As shown in FIG. 4, the barrel 16 is a eyebrows shape in which two cylindrical cylinders 13 are connected in parallel in the longitudinal direction and a pair of arc portions 14 are connected in a cross section orthogonal to the longitudinal direction X, respectively. In the cylindrical cylinder 13, biaxial rotating shafts 18 extending in the longitudinal direction X concentrically with the cylindrical cylinder 13 and rotating about the longitudinal direction X at predetermined intervals are provided. As usual, they are pivotally supported by, for example, a bearing (not shown) so that they can rotate about the longitudinal direction X, and each rotary shaft 18 is connected to the rotary drive motor 19 via a rotation transmission mechanism 21 in the same direction. They are connected so that they rotate in synchronization.
In each of the two-axis rotary shafts 18, the pair of screw elements 20 (including the transport screw element 20A and the squeeze screw element 20B described later) can rotate about the longitudinal direction X of the rotary shaft 18. For example, a spline outer fit to the outer peripheral surface of the rotary shaft 18, the pair of screw elements 20 are made of metal, are identical to each other, are provided at the same position in the longitudinal direction X of the barrel 16, and are biaxial rotary shafts. They are arranged so as to mesh with each other at a predetermined interval D (see FIG. 6).
As shown in FIG. 2 (C1 to C12), the cylinder 12 is divided in the longitudinal direction together with the barrel 16 (described later) formed inside, and an overhanging flange 41 is provided on the end face of each divided portion. , The divided portions adjacent to each other in the longitudinal direction are screwed together in a liquid-sealed manner via a screw hole 43 (FIG. 4) provided in the overhanging flange 41, and each divided portion is a transport portion except for an extruded portion. , Consists of either the oil squeezing section. This is effective when inspecting, replacing, or the like in the screw element 20 in the barrel 16 corresponding to each of the transport section and the oil squeezing section.

The oil-containing solid material is arbitrary as long as it is a solid material containing oil and softened by heating, and is an industrial material, a natural product, or a food residue, and the embodiment is bulk, pellet, or flake-like pieces. , Granular or powdery.
In particular, as will be described later, for example, a thermoplastic resin is preferable, and the oil-containing solid material may be industrial waste material from the viewpoint that the oil-extracted solid material is extruded into a strand shape as it is and pelletized so that it can be reused. ..
The raw material supply unit 10 is composed of a hopper 23, a coil feeder (not shown), a shooter (not shown), and a forced feeder (not shown), all of which are conventionally known, and the shooter is connected by the material supply port 31. ing.
The coil feeder at the lower part of the hopper 23 supplies the oil-containing solid material M charged into the hopper 23 to the shooter, and the shooter has a pushing capacity and a feed to forcibly feed the oil-containing solid material M to the shooter. A force feeder having the ability is inserted, and the supply amount of the oil-containing solid material M per hour into the barrel 16 can be set. As a modification, the hopper 23 may be directly connected to the material supply port 31 without using a shooter.

The heating unit 28 is configured to externally heat the oil-containing solid material M in the barrel 16 via the inner surface of the barrel 16 by a heating heater provided inside a conventionally known cylinder 12, and the oil-containing solid material M is configured. The oil-containing solid material M is heated to a temperature equal to or lower than the melting point of the solid material or the allowable heating temperature of the oil O, whichever is lower, by the time it reaches the oil squeezing unit 24 described later.
As a result, when the oil-containing solid material M reaches the oil-squeezed portion 24, it is softened so that it can be squeezed, and the oil-containing solid material M is overheated so that the squeezed oil O is not thermally deteriorated. Or, by preventing the heat-deteriorated solid material M from being mixed with the squeezed oil content O, the material of the oil content O is secured. As described above, the heating temperature by the heating unit 28 is preferably set according to the types of the oil-containing solid material M and the oil O.
The extrusion unit 33 is provided with a die 35 in the same manner as that conventionally used in the melt-kneading extruder, and the oil content O oil-squeezed residual solid material M is squeezed and extruded to the outside.

As shown in FIG. 1, a plurality (3 units) of oil squeezing portions 24 are provided in series in the longitudinal direction X, and each of them is provided with a transport portion 30 and a squeezing portion 32 adjacent to each other from the upstream side to the downstream side. Has been done.
Hereinafter, since the pair of screw elements 20 provided on the rotating shaft 18 to which each screw element 20 corresponds is the same as each other, one of them will be described below.
In the transport unit 30, the pair of screw elements 20 are transport screw elements 20A capable of transporting the oil-containing solid material M to the downstream side X in the longitudinal direction of the barrel 16, respectively, and the transport screw element 20A is a conventionally known full. A flight screw is fine.
In the squeezing section 32, the pair of screw elements 20 are squeezing screw elements 20B capable of squeezing the oil-containing solid material M, respectively.
As shown in FIG. 5, the squeezing screw element 20B has a circular opening 48 into which a rotary shaft 18 is fitted, and disks 52 having two or more chips 50 in the circumferential direction are stacked in the longitudinal direction X (FIG. 5). The corresponding chip 50 of the disk 52 adjacent to the longitudinal direction X is a discontinuous type in the longitudinal direction X, which is offset in the circumferential direction, and has a circular opening 48 with respect to the center of the barrel 16. The center is offset. More specifically, the disk 52 provided at each end has three threads, and the disk 52 provided between both ends has four threads. Each disc 52 is provided with irregularities on the contact surface so that the discs 52 adjacent to each other in the longitudinal direction are fitted and fixed.
As will be described later, the thickness t of each disc is preferably determined from the viewpoint of adjusting the time for the oil-containing solid material M to pass through the pressing screw element 20B by the longitudinal length L of the pressing screw element 20B. ..
Similar to the transport screw element 20A, the squeeze screw element 20B is configured to transport the oil-containing solid material M in the downstream direction of the longitudinal direction X by rotating the rotary shaft 18 about the axial direction, and is a disk. The 52 is provided so as to be inclined in the axial direction of the rotary shaft 18 (inclination is not shown in the drawing).
In each of the divided portions C4, C7 and C9 of the barrel 16, two sets of squeezing screw elements 20B shown in FIG. 5 are arranged in series in the longitudinal direction.

As shown in FIG. 8, each of the four discs 52 has an outer peripheral edge composed of a combination of arcs, four chips 50 are arranged at predetermined intervals in the circumferential direction, and one is a chip angle Θ1. One is composed of a tip angle Θ2 larger than Θ1, and the other two is composed of an angle smaller than the tip angles Θ1 and Θ2. The flow path cross-sectional area SA configured between them is divided by the chip 50, similarly to the disk 52 of the third row.
The arrangement in the circumferential direction of the tip and the tip angle may be determined from the viewpoint of achieving a desired degree of pressing with respect to the oil-containing solid material M, similarly to the eccentricity d.
The two sets of squeezing screw elements 20B each come into contact with the rotary shaft 18 in such a manner that the most downstream three-row disk 52 of the upstream set and the most upstream three-row disk 52 of the downstream set come into contact with each other. The three-row disc 52 on the most downstream side and the three-row disc 52 on the most upstream side, which are connected to each other, may be brought into contact with each other by shifting them in the circumferential direction of the rotary shaft 18, or may be brought into contact with each other without shifting in the circumferential direction. good. On the other hand, the three-row disk 52 on the most upstream side of the upstream set and the three-row disk 52 on the most downstream side of the downstream set are in contact with the end faces of the adjacent transfer screw elements 20A, respectively. Each of them is connected to 18.

As described above, the three-row discs 52 at both ends of the squeezing screw element 20B are provided from the viewpoint of the assembling property of the squeezing screw element 20B, respectively, and as long as the desired degree of squeezing is secured, both ends thereof are provided. One or both of the three-row discs 52 may be four-row discs in the same manner as the four-row discs 52 in the middle portion, or all or part of the four-row discs 52 in the middle portion may be the three-row discs 52 at both ends. Similarly, it may be Article 3.
Regarding the squeezing screw element composed of the seven discs shown in FIG. 5, each of the two end faces is a so-called rice ball-shaped three-row, and the five discs between the two end faces are any of them. The cross-sectional area of the flow path is smaller than that of both end faces, and the oil-containing solid material has more squeezing force, including the radial direction, while passing between both end faces. Is loaded. In this way, by setting the number of rows of each disc individually, it is possible to adjust how the cross-sectional area of the flow path is narrowed with respect to the transport screw element arranged adjacent to the upstream side, thereby, with respect to the oil-containing solid material. It is possible to adjust the load of squeezing force, including the radial direction, and thus the degree of squeezing.
On the other hand, by setting the thickness of each disc individually, it is possible to adjust the squeezing time while the oil-containing solid material passes through the squeezing screw element, thereby similarly adjusting the degree of squeezing. be.
Further, as described above, by shifting the position of the chip in the circumferential direction between the adjacent disks of the squeezing screw element, all the adjacent disks are softer than the case where the positions of the chips are aligned in the circumferential direction. When the converted oil-containing solid material M flows through the flow path between the inner surface 36 of the barrel 16 and the outer surface of the squeezing screw element 20B, it becomes resistance to the flow of the oil-containing solid material M, and in some cases turbulence is drawn. It is raised, and the degree of squeezing is improved by that amount, and the oil-squeezing property is further increased. Therefore, the angle at which the chip position is shifted in the circumferential direction between adjacent disks is often determined from this point of view, and the shifting angle is, for example, several degrees or a number between the corresponding chips between adjacent disks. It is ten degrees.

As shown in FIG. 6, in each squeezing screw element 20B, the outer peripheral closed curved portion 40 constituting the cross-sectional area orthogonal to the longitudinal direction X of the barrel 16 is rotated around the rotation shaft 18 of the squeezing screw element 20B. A region formed between the outer peripheral closed curve portion 40 and the arc portion 14 is divided into a plurality of partial regions 42 while maintaining a predetermined distance d between the outer peripheral closed curve portion 40 and the arc portion 14, and any portion thereof. The outer peripheral closed curved portion 40 has a non-circular shape, and the rotation axis of the corresponding rotation shaft 18 is an arc so that the area of the region 42 increases or decreases according to the rotation of the pressing screw element 20B about the rotation shaft 18. It is concentric with the center of the portion 14.
More specifically, the region formed between the outer peripheral closed curve portion 40 and the arc portion 14 is divided into five regions SA1 to SA5 as a partial region 42, and FIGS. 6A to 6C are shown. As shown in the above, the areas of SA1 to SA5 are increased or decreased according to the rotation of the rotating shaft 18.
It is preferable that the tip 50 is as small as possible (for example, 0.2 mm or less) within a range where the tip of the tip 50 does not contact the inner surface 36 of the barrel 16 at a predetermined interval d, whereby the cross-sectional area between SA1 and SA5 of the flow path is SA1 to SA5. Therefore, when the total area of the flow path cross-sectional areas SA1 to SA5 is set to be smaller than the total area of the transport portion adjacent to the upstream side in the longitudinal direction, the oil content in each of the flow path cross-sectional areas SA1 to SA5 is set. Effective for squeezing.
The above points are the same for the flow path cross-sectional area SA formed by the four discs 52 provided between both ends of each of the pair of squeezing screw elements 20B.

The flow path cross-sectional area SA of the oil-containing solid material M formed between the outer surface 34 of the squeezing screw element 20B and the inner surface 36 of the barrel 16 is the outer surface 34A of the transport screw element 20A and the inner surface 36 of the barrel 16. It is set smaller than the flow path cross-sectional area SA of the oil-containing solid material M formed between and. As a result, as will be described later, the softened oil-containing solid material M is conveyed from the conveying section 30 to the pressing section 32 and is squeezed including the radial direction. The flow path cross-sectional area SA of the oil-containing solid material M is preferably determined from such a viewpoint.

More specifically, the cross-sectional area SA (SA1 to SA5) of the flow path cross section of the oil-containing solid material M formed between the inner surface 36 of the barrel 16 shown in FIG. 6 and the outer surface 34B of the squeezing screw element 20B. Is set smaller than the cross-sectional area SA of the flow path cross section formed between the inner surface 36 of the barrel 16 shown in FIG. 7 and the outer surface 34A of the transport screw element 20A. In the transport section 30, the oil-containing solid material M transported by the rotation of the adjacent transport screw element 20A on the upstream side in the longitudinal direction of the barrel 16 flows into the squeeze section 32 and downstream due to the rotation of the squeeze screw element 20B. While being transported in the direction, it is squeezed including the radial direction, oil is squeezed from the oil-containing solid material M, and on the spot, only the oil is recovered by the oil recovery unit 26, and the oil-containing solid material M after oil extraction is It is configured to be transported to the downstream side in the longitudinal direction of the barrel 16.
From the above, the method of narrowing the cross section of the flow path in the squeezing portion 32 may be determined from the viewpoint of adjusting the squeezing force including the radial direction. As shown in FIG. 7, the transport screw element 20A is not only a full flight screw having two threads, but also a full flight screw having one or three threads as long as it conforms to the narrowing of the cross section of the flow path in the pressing portion 32. But it may be.
As a modification, the outer peripheral closed curve portion 40 may have a circular shape, and the rotation axis of the corresponding rotation shaft 18 may be eccentric with the center of the arc portion 14.
The barrel 16 of the squeezing screw element 20B has a predetermined area so that the flow path cross-sectional area SA of the oil-containing solid material M formed between the outer surface 34 of the squeezing screw element 20B and the inner surface 36 of the barrel 16 has a predetermined area. The outer peripheral edge shape of the cross section orthogonal to the longitudinal direction X is set.
The degree of squeezing of the oil-containing solid material M in the oil-squeezed portion is adjusted depending on the flow rate of the oil-containing solid material M of the barrel 16 depending on how small the flow path cross-sectional area is set.

The axial length L of the squeezing screw element 20B and the side peripheral surface 34B facing the inner surface 36 of the barrel 16 of the squeezing screw element 20B are oil-containing solid materials M under a given rotation speed of the rotating shaft 18. The shape is set so that the pressing time from the oil-containing solid material transport direction upstream end 44 to passing through the oil-containing solid material transport direction downstream end 46 of the squeezing screw element 20B can be secured for a predetermined time. For example, under a given rotation speed of the rotary shaft 18, the longer the axial length L, the longer it takes for the oil-containing solid material M to pass through the squeezing screw element 20B, and the longer the squeezing time is set. Will be done.
The number of threads of the screw element 20, the tip angle of the predetermined tip 50, the amount of eccentricity, and the predetermined interval D are selected according to the type, bulk specific gravity, or viscosity of the oil-containing solid material M.
The predetermined interval D is, for example, 0.2 mm or less, and is set so that overheating due to shearing of the oil-containing solid material M does not occur or self-cleaning of the squeezing screw element 20B is possible. Will be done.
As a modification, in the squeezing screw element 20B, different types of screw elements 20 having different numbers of rows and eccentricities may be aligned in the longitudinal direction X of the barrel 16.
For example, in a plurality of oil-squeezing portions 24, the number of threads of the pressing screw element 20B may be increased as the oil-squeezing portion 24 is located on the downstream side in the longitudinal direction X of the barrel 16, whereby the degree of squeezing may be increased toward the downstream side. It becomes possible to increase the number of threads, and the number of threads may be changed for each disk 52.

A plurality of (three units on the drawing) oil squeezing portions 24 are provided in series in the longitudinal direction X of the barrel 16, and the oil content O squeezed from the oil content O-containing solid matter is collected from each oil content recovery unit 26 for each oil squeezing unit 24. It is configured to be recovered on the spot, and can be selected according to the amount of the oil-containing solid material M supplied per hour by the supply unit 22.
For example, when the amount of the oil-containing solid material M supplied from the supply unit 22 per hour is small, only the most upstream side of the plurality of oil extraction units 24 is used, and the screw 62 of the oil recovery unit 26 on the downstream side thereof is used. May be stopped.
As a result, the oil-containing solid material M squeezed by the oil squeezing section 24 on the upstream side can be squeezed again by the oil squeezing section 24 on the downstream side, thereby ensuring the oil recovery yield.
As a modification, the oil O-containing solid matter squeezed in the barrel 16 is returned to the oil O-containing solid matter supply side of the barrel 16 and circulated so as to be squeezed again. A return flow path for connecting to the upstream portion may be provided. Further, a plurality of oil squeezing portions 24 may be provided and a return flow path may be provided.

The oil recovery unit 26 has an oil outflow opening 38 in the vicinity of the squeezing screw element 20B of the barrel 16 so that only the squeezed oil O accumulated in the lower part of the barrel 16 can be recovered.
More specifically, the oil outflow opening 38 extends from the bottom of the barrel 16 to the upper level so that the squeezed oil O accumulated in the lower part of the barrel 16 can be recovered, and the squeezing screw element 20B of the oil squeezing portion 24. It is preferable to provide a pair before and after the axial length.
In particular, the oil recovery unit 26 is preferably connected to the transport unit 30 adjacent to each of the upstream side and the downstream side in the longitudinal direction of the squeeze unit 32.

The oil recovery unit 26 is provided in a casing 60 having an oil recovery opening 59 and a casing 60 having an end end supported by a stand 29 and communicated with the oil outflow opening 38, toward the oil outflow opening 38. A screw 62 that rotates in the forward direction is provided, and the oil O to be squeezed is recovered through the oil recovery opening 59, while the oil-containing solid material M squeezed is not recovered. As a result, the oil-containing solid material M squeezed by the oil squeezing unit 24 on the upstream side can be squeezed again by the oil squeezing unit 24 on the downstream side while recovering the oil content that has been squeezed.

As shown in FIG. 9, a die adapter 70, a die head 72, and a die plate 77 that discharge a conventionally known molten resin raw material as a string-shaped strand 88 are provided in an extrusion portion 33 provided at the most downstream portion in the longitudinal direction of the barrel. A assembly 75 including the die 76 and a die holder 74 for holding the die 76 are provided. A plurality of outflow holes are formed in the die plate 77 side by side, for example, and a string-shaped strand 88 is generated by discharging the molten resin from each outflow hole.

The diagnosis 75 consists of an inflow section into which the resin, which is an oil-squeezed solid material, flows in, and an outflow section in which the molten resin flows out to the die plate 77. The part that detects the temperature is exposed to the flow path, the pressure of the molten resin is detected, and the thermometer (not shown) installed in the outflow part exposes the part that detects the temperature to the flow path. Detects the temperature of the molten resin.
The extrusion unit 33 is provided with a melting unit 80, and heats the resin raw material from the die plate 77 to a melting temperature so that the resin raw material can be extruded into strands 88. The melting portion 80 may be a heating heater 78 arranged inside the assembly 75 so as to surround the inflow portion and the outflow portion, similarly to the heating portion 28 that heats the oil-containing solid material M until it becomes a softened state. The inner peripheral surface of the die assembly 75 constitutes a heat transfer surface so as to melt the resin raw material inside. Depending on the type of the resin raw material or the amount of the resin raw material supplied per hour, it is preferable to adjust the heating capacity of the heater so that the resin raw material is in a molten state where it can be extruded when it reaches the diagnosis 75. ..

The strand cutter 86 is a conventionally known type installed at the tip of the sland 88 extruded from the die 76 in the extrusion direction, and may be a cutter composed of a rotary blade (not shown) and a fixed blade (not shown). The rotary blade is configured as a drum-type cutter that can rotate around a horizontal rotary blade rotation axis, and a plurality of rotary blade tips are provided at regular intervals in the circumferential direction of the drum, while the fixed blade is extruded. Guide the strand 88. As a result, the rotary blade edge of the rotary blade hits the strand from directly above the strand 88 extruded from the die 76 to the outside, so that the strand 88 is sandwiched between the rotary blade edge and the fixed blade and sheared, and the strand 88 is cut. The pellet 90 is formed. The cut pellets 90 are discharged, for example, into a product box (not shown) and reused as a molding material for new products. The rotation speed of the rotary blade rotation shaft may be adjusted in relation to the extrusion speed of the strand 88 according to the desired size of the pellet 90. Before cutting the strand by the strand cutter 86, it is preferable to cool the strand by air cooling or water cooling to facilitate cutting.

The operation of the oil-squeezing and pelletizing apparatus 10 having the above configuration will be described below, including the oil-squeezing and pelletizing method, with reference to FIG.
First, the oil-containing solid material M is heated by the heating unit 28 to a temperature equal to or lower than the melting point of the solid material or the allowable heating temperature of the oil O, whichever is lower, depending on the type of the oil-containing solid material M to be squeezed. The heating temperature is set so as to be such that the melting unit 80 heats the solid material after oil extraction to a molten state.
Next, the amount of material supplied per hour by the feeder in the supply unit 22 and the amount of oil-containing solid material M transported per hour by the rotation of the screw element 20 in the transport unit are set.
Thereby, by adjusting the forward transport speed of the oil-containing solid material, the filling degree of the oil-containing solid material M in the closed space inside the barrel 16 is adjusted.
In particular, the optimum rotation speed (described below) for maximizing the oil extraction recovery yield is set according to the type and mode of the oil-containing solid material M and the type of the screw element 20.

As described above, the preparation for continuously transporting the oil-containing solid material M is completed by the rotation of the screw element 20 which is arranged in the barrel 16 and is fitted onto the rotary shaft 18 which is rotatable about the axis of the rotary shaft 18. ..
Next, the oil-containing solid material M is continuously supplied while the inner surface of the barrel 16 is maintained at a predetermined temperature and the rotary shaft 18 is rotated by the feeder and the drive motor 19.
The supplied oil-containing solid material M is transported toward the downstream of the barrel 16 in the longitudinal direction, and during that time, the oil-containing solid material M is transported to a temperature lower than the melting point of the solid material or the allowable heating temperature of oil O, whichever is lower. Is heated.
Next, the oil-containing solid material M that has been heated and softened is squeezed as follows by being squeezed including the radial direction while being continuously conveyed downstream in the longitudinal direction in each oil squeezing section 24. The radius.

More specifically, in the oil squeezing step, the cross-sectional area of the flow path is narrowed over a predetermined length in the closed space while continuously transporting the oil-containing solid material M toward the downstream side in the extending direction in the closed space. The oil content is squeezed from the oil content solid material M by squeezing the oil content solid material M under a predetermined squeezing force for a predetermined squeezing time by passing through the passed portion.
At that time, the cross-sectional area of the flow path is narrowed on the downstream side of the closed space to form a pressure barrier, thereby increasing the filling degree of the heated oil-containing solid material M in the closed space on the upstream side of the pressure barrier. At the same time, the oil-containing solid material M is squeezed, the oil is squeezed, and the squeezed oil is continuously recovered.
The squeezed oil is recovered on the spot through each oil recovery section 26 to the side in the extending direction of the closed space.

On the other hand, the oil-squeezed solid material is extruded from the die 76 to the outside as a strand 88, and the strand 88 is sandwiched between the rotary cutting edge and the fixed blade and sheared by the strand cutter 86, and the strand 88 is cut and the pellet 90 is cut. Is formed. The cut pellets 90 are discharged, for example, into a product box (not shown) and reused as a molding material for new products.
Residual solids adhering to the outer surface of the screw element 20 may be appropriately removed after the oil extraction work is completed.
For the oil squeezing yield, the oil squeezing yield is determined by the squeezing degree by the screw element 20, and the squeezing degree is determined by the squeezing degree of the screw element 20 as the basis for the existence of the optimum rotation speed under the constant amount of material supplied into the barrel 16 per hour. Until the material passes from the upstream end surface to the downstream end surface of the screw element 20 whose controlling factor is the squeezing force between the outer surface of the screw element 20 and the inner surface of the barrel 16 and the material transport speed as the controlling factor. It is determined by the product of the squeezing time.
In this respect, when the rotation speed of the screw element 20 is increased, the squeezing force is increased but the squeezing time is decreased, and when the rotation speed is decreased, the squeezing force is decreased but the squeezing time is increased.
Therefore, there is an optimum rotation speed for maximizing the squeezing degree in the squeezing degree determined by the product of the squeezing force and the squeezing time.

According to the oil squeezing and pelletizing apparatus 10 having the above configuration, the oil-containing solid material M supplied into the barrel 16 from the supply unit 22 is located on the downstream side in the longitudinal direction of the barrel 16 due to the rotation of the rotating shaft 18, that is, the screw element. The oil-containing solid material M is heated to a softened state by the heating unit 28 to a temperature lower than the melting point of the solid material or the allowable heating temperature of the oil content, and is squeezed by the squeezing screw element 20. As for the oil that has been squeezed and recovered, only the squeezed oil that collects in the lower part of the barrel is recovered by the oil recovery unit 26 through the oil outflow opening 38, while the solid material after oil squeezing. In the extrusion section 33 on the downstream side of the oil extraction section 24, the oil is melted by the melting section 80 in the vicinity of the extrusion section, extruded to the outside in the shape of a strand 88, and cut into a pellet product. Through the separation of the oil-containing solid material from the recovered solid material, the oil-containing solid material M can be continuously transported and squeezed, and the squeezed solid material can be made into pellet products on the spot and reused.
Further, according to the oil squeezing and pelletizing device 10 having the above configuration, the motor that rotationally drives the rotary shaft 18 is completely filled in the longitudinal direction in the internal space of the barrel 16 so as not to cause an excessive torque. Therefore, while avoiding transporting the oil-containing solid material M in a softened state by heating, the barrel 16 is capable of squeezing including the radial direction while continuously transporting the oil-containing solid material M in the longitudinal direction. Even if the space between the inner surface and the screw element 20 is narrowed, the oil itself of the liquid squeezed from the oil-containing solid material M is not conveyed in the longitudinal direction of the barrel 16 by the rotation of the screw element 20, and is squeezed. An oil recovery section 26 is provided in front of the barrel 16 of the oil squeezing section 24 in the longitudinal direction, preferably in the front and rear, respectively, where it accumulates in the lower portion of the internal space of the barrel 16 of the section 24, and a closed space in the barrel 16 is provided. It is possible to efficiently recover the oil accumulated in the barrel.

More specifically, according to the above oil squeezing and pelletizing apparatus 10, the pair of screw elements 20 externally fitted to each rotating shaft 18 are rotated in the same direction as the rotating shaft 18 rotates about its axis. The oil-containing solid material M that rotates and is charged into the barrel 16 is conveyed downstream of the barrel 16 in the longitudinal direction X.
At that time, the flow path cross-sectional area SA of the oil-containing solid material M formed between the outer surface 34 of the squeezing screw element 20B and the inner surface 36 of the barrel 16 is the outer surface 34A of the transport screw element 20A and the barrel 16. Since the oil-containing solid material M is set to be smaller than the flow path cross-sectional area SA of the oil-containing solid material M formed between the inner surface 36 and the inner surface 36, the oil-containing solid material M fills the entire flow path cross-sectional area SA in the pressing portion 32. As a result, in the flow path cross-sectional area SA, the oil-containing solid material M has the oil-containing solid material M from the transport direction upstream end 44 of the oil-containing solid material M of the pressing screw element 20B to the oil-containing solid material M transport direction downstream end 46. Until it passes, the oil O that has been squeezed and squeezed including the radial direction is collected on the spot at the bottom of the barrel 16, and only the squeezed oil O that is collected at the bottom of the barrel 16 is collected by the oil recovery unit 26 and squeezed. The solid matter is conveyed in the barrel 16 to the downstream side in the longitudinal direction X.
As described above, the oil-containing solid material M is squeezed in the oil squeezing section 24 under a predetermined squeezing force due to the narrowing of the cross-sectional area SA of the flow path, including the radial direction, to squeeze the oil. Then, only the oil O accumulated in the place is recovered by the oil recovery unit 26 through the oil outflow opening 38.

On the other hand, according to the squeezing method of the present embodiment, the melting point of the solid material or the allowable heating temperature of the oil content is continuously conveyed in the closed space in the forward direction along the extension direction of the closed space. By heating to the lower temperature or lower, the oil-containing solid material M is in a softened state where oil can be squeezed, and by forming a pressure barrier on the downstream side of the closed space, heating in the closed space on the upstream side of the pressure barrier is performed. By increasing the filling degree of the oil-containing solid material M, the oil-containing solid material M is squeezed including the radial direction, and by squeezing the oil, for example, the oil-containing solid material M is placed in a container. By putting it in and squeezing it statically, it is possible to continuously recover the squeezed oil, unlike the case of batch squeezing.
Further, dynamic squeezing is not caused by utilizing the shearing on the object generated in the meshing portion between the corresponding squeezing screw elements 20B of each rotating shaft 18, and the oil-containing solid material M is heated by such shearing. This prevents the oil content to be squeezed from causing thermal deterioration, and the oil-containing solid material M remains attached to the outer surface of the squeezing screw element 20B. It is also possible to eliminate the risk of foreign matter getting mixed in the oil.

The second embodiment of the present invention will be described below. In the following description, the same components as those in the first embodiment will be omitted by assigning similar reference numbers, and in the following, the feature portions of the present embodiment will be described in detail with reference to FIG. Explain to.
A feature of the second embodiment of the present invention is a squeezing screw element 20B provided in each squeezing portion.

In the first embodiment, regarding the screw element 20B which also serves as axially transporting and squeezing the barrel 16 of the oil-containing solid material M, a plurality of thin plates have a non-position (cusp) of the tip 50 in the circumferential direction. Although it has been described as a type in which the barrel 16 is stacked in the axial direction while being continuously displaced, the description is not limited to this, and the barrel 16 of the oil-containing solid material M can be conveyed in the axial direction by the rotation of the screw. As long as a narrowing of the flow path area of the oil-containing solid material M is formed in the axial direction and thereby squeezing is possible, a plurality of thin plates are not stacked, but are monolithic screws having an outer surface. A lead 30 in which the positions of the chips 50 in the circumferential direction are continuously connected in the longitudinal direction may be formed on the 34B.
More specifically, as shown in FIG. 10, the squeezing screw element 20B has four threads, is a monolithic shape having a circular opening 48 in which the rotating shaft 18 is fitted, and both end faces 44 separated in the longitudinal direction X. , 46 each has two or more (four) chips 50 in the circumferential direction, and a spiral lead 56 connected to the chips 50 on both end faces 44 and 46 is provided on the peripheral side surface, and is a continuous type in the longitudinal direction X. The center of the circular opening 48 is offset from the center of the barrel 16.
By adjusting the pitch of the spiral reed 56, it is possible to adjust the transport speed of the oil-containing solid material M by the squeezing screw element 20B, that is, the squeezing time of the oil-containing solid material M.
When a plurality of oil squeezing parts 24 are provided, a certain oil squeezing part 24 is a discontinuous type pressing screw element 20B in the first embodiment, and a certain oil squeezing part 24 is a continuous type squeezing part in the present embodiment. A screw element 20B may be adopted.
The oil-squeezed solid material is the same as in the first embodiment in that the strand 88 extruded from the die 76 is cut by the strand die cutter 86 so that it can be reused as pellets 90.

The third embodiment of the present invention will be described below. In the following description, the same components as those in the first embodiment are designated by the same reference numbers, and the description thereof will be omitted. In the following, the feature portions of the present embodiment will be described in detail with reference to FIG. Explain to.
The feature of the third embodiment of the present invention is the aspect of the melting part that heats the solid material after oil extraction provided in the vicinity of the extrusion part 33 to the molten state, and in the first embodiment, the extrusion part 33 at the most downstream part. The heating coil 78 provided in the above heats the solid material after oil extraction to a molten state, whereas in the present embodiment, the solid material after oil extraction is heated to a molten state by a screw element on the upstream side near the extrusion portion 33. There is a point to do.
More specifically, as shown in FIG. 11, in the first embodiment, the normal transport screw element 20A is arranged in the zone C11 (see FIG. 2), but in the present embodiment, oil is squeezed. A screw element 20C of the same type as the squeezing screw element 20B provided in each of the zones C4, C7 and C9 is arranged, and the oiled solid material passing through the zone C11 is shear-heated and melted by the rotation of the screw element 20C. I have to.

The oil-squeezed solid material melted in the zone C11 is in a molten state in the extrusion section 33 and can be extruded into a strand shape, so that the zone C12 and the zone C13 are kept warm by the heating section 28. There is. In the first embodiment, it is preferable that the heating heater 78 as the melting unit 80 provided in the extrusion unit 33 also has a heat retaining function so that the molten solid material can be maintained in a molten state instead of being melted.
In the extrusion section 33, since it is a condition that the inside of the die 76 is in a completely melted state so that the melted solid material is uniformly discharged, C12 is provided as a vacuum exhaust zone and is usually full flight. A screw element, on the other hand, the C13 requires a full flight screw to keep the pressure at the outlet (die 76) constant (filled with melted fixing material), both of which are particularly narrow between flights. That is, it is preferable to use a full flight screw having a small lead.

The screw element 20C is required to have a shear heating function instead of a squeezing function. However, a three-thread screw element having a disk configuration as shown in FIG. 5 may be used, and as long as it is effective for shear heating, 4 is required. Article 5 may be used.
The oil-squeezed solid material is the same as in the first embodiment in that the strand 88 extruded from the die 76 is cut by the strand die cutter 86 so that it can be reused as pellets 90.

Although the embodiments of the present invention have been described in detail above, those skilled in the art can make various modifications or changes within the scope of the present invention.
For example, in the present embodiment, in the pressing portion, the flow path cross-sectional area of the oil-containing solid material formed between the outer surface of the pressing screw element and the inner surface of the barrel is the outer surface of the conveying screw element and the barrel. The case where the oil-containing solid material is set to be smaller than the flow path cross-sectional area of the oil-containing solid material formed between the inner surface and the inner surface has been described, but the oil-containing solid is not limited to this by using a conventionally known reverse feed screw element. Oil may be squeezed by applying back pressure to the material, and the solid material after oil extraction may be extruded into strands and pelletized.
For example, in the present embodiment, the point that the screw element 20 is selected according to the type and mode of the oil-containing solid material M in the pressed portion has been described, but when the screw element 20 is selected, the lead of the screw element 20 is included. The squeezing time in the squeezed portion is adjusted by the shape of the outer peripheral surface and the length in the longitudinal direction, or the cross-sectional area of the flow path is increased or decreased by the shape of the outer peripheral surface including the number of threads of the screw element 20 to increase the squeezing force in the squeezed portion. Optimal rotating shaft depending on the type and embodiment of the screw element 20 and the oil-containing solid material M thus selected by adjusting or by adjusting both the squeezing time and the squeezing force in the squeezing section. After setting the number of revolutions of 18, the oil squeezing effect may be optimized.

For example, in the present embodiment, the screw element 20 is selected according to the type and mode of the oil-containing solid material M in the squeezed portion, and more specifically, the outer peripheral edge shape including the number of threads of the screw element 20 is used. It was explained that the squeezing force in the squeezing part is adjusted by increasing or decreasing the cross-sectional area of the flow path, or both the squeezing time and the squeezing force in the squeezing part are adjusted. When the oil-containing solid material M transported in a non-filled state in 16 passes through the squeezing screw element 20B, a flow formed between the inner surface 36 of the barrel 16 and the outer peripheral surface 34 of the squeezing screw element 20B. A flow path formed between the inner surface 36 of the barrel 16 and the outer peripheral surface of the squeezing screw element 20B so that the desired squeezing degree is achieved by increasing the filling degree of the oil-containing solid material M in the road. The volume may be determined.

For example, in the present embodiment, a plurality of oil content recovery units 16 extending laterally are provided at predetermined intervals in the longitudinal direction of the barrel 16, and oil content O squeezed from the oil content solid material M is collected from each oil content recovery unit 16. It was explained that collecting from the barrel 16 enhances both the recovery efficiency per hour and the recovery yield, but without limitation, if the recovery yield is more important than the recovery efficiency per hour, the barrel 16 By increasing the L / D of the barrel 16, the number of screw elements 20 that also transport and squeeze the oil-containing solid material M is increased, and a single oil content is provided at the end of the barrel 16 opposite to the oil-containing solid material M supply side. The collection unit 16 may be provided. In this case, the L / D of the barrel 16 is increased to prevent excessive torque.

For example, in the present embodiment, a plurality of oil content recovery units 16 extending laterally are provided at predetermined intervals in the longitudinal direction of the barrel 16, and oil content O squeezed from the oil content solid material M is collected from each oil content recovery unit 16. However, if the recovery efficiency per hour is more important than the recovery yield, the barrel 16 is simply located at the end opposite to the oil-containing solid material M supply side. The oil-containing solid material M that has been squeezed may be returned to the oil-containing solid material M supply side of the barrel 16 and circulated so as to be squeezed again while providing the oil content recovery unit 16. A temperature holding portion may be provided in the flow path constituting the return portion in order to prevent the temperature of the oil-containing solid material M from dropping. In this case, since it is not necessary to increase the L / D of the barrel 16, the lengthening of the squeezing device is suppressed and the possibility of excessive torque is reduced.

It is a schematic whole perspective sectional view of the oil squeezing and pelletizing apparatus 10 which concerns on 1st Embodiment of this invention. It is a schematic partial sectional view of the oil squeezing and pelletizing apparatus 10 which concerns on 1st Embodiment of this invention. It is schematic cross-sectional view along AA of FIG. 1 of the side recovery part 16 of the oil squeezing and pelletizing apparatus 10 which concerns on 1st Embodiment of this invention. It is a schematic sectional drawing of the oil-squeezing part 24 of the oil-squeezing and pelletizing apparatus 10 which concerns on 1st Embodiment of this invention. It is a side view, end view and perspective view of the screw element 20B of the oil squeezing part 24 of the oil squeezing and pelletizing apparatus 10 which concerns on 1st Embodiment of this invention. Between the inner surface of the barrel 16 and the screw element 20 according to the rotation of the screw element 20B of the oil squeezing portion 24 of the oil squeezing and pelletizing device 10 according to the first embodiment of the present invention (6 (A) to 6 (C)). It is a schematic cross-sectional view which shows the change of the flow path cross-section SA formed in. It is the same figure as FIG. 6 of the screw element 20A of the transport part 30 of the oil squeezing and pelletizing apparatus 10 which concerns on 1st Embodiment of this invention. In the screw element 20B of FIG. 5 according to the first embodiment of the present invention, the figure is the same as that of FIG. 7 between the four discs in the middle portion. It is a partial sectional view around the extrusion part 33 of the oil squeezing and pelletizing apparatus 10 which concerns on 1st Embodiment of this invention. It is a perspective view of the screw element 20B of the oil squeezing and pelletizing apparatus 10 which concerns on 2nd Embodiment of this invention. It is the same figure as FIG. 2 of the oil squeezing and pelletizing apparatus 10 which concerns on 3rd Embodiment of this invention.

X Longitudinal direction D Predetermined interval M Oil-containing solid material O Oil content SA Channel cross-sectional area L Axial length of screw element
d Prescribed clearance
t Disc thickness 10 Oil squeezing and pelletizing device 12 Cylinder 13 Cylindrical cylinder 14 Arc part 16 Barrel 17 Internal space 18 Rotating shaft 19 Drive motor 20 Screw element 20A Transport screw element 20B Squeezing screw element 20C Melting screw element 21 Rotation transmission Mechanism 22 Supply part 23 Hopper 24 Oil squeezing part 25 Support stand 26 Oil recovery part 27 Drive motor 28 Heating part 29 Support stand 30 Transport part 31 Rotation transmission mechanism 32 Squeezing part 33 Extruding part 34A Outer surface 34B of screw element 20A for squeezing Outer surface 36 Inner surface 38 Oil outflow opening 40 Outer peripheral closed curved part 41 Overhanging flange 42 Partial area 43 Screw hole 44 Oil-containing solid material M Transport direction upstream end 46 Oil-containing solid material M Transport direction downstream end 48 Circular opening 50 Chip 52 Disk 56 Spiral lead 58 Return flow path 60 Casing 61 Shaft 62 Screw 63 Oil recovery opening 70 Die adapter 72 Die head 74 Die holder 75 Cylinder 76 Die 77 Die plate 78 Heating heater 80 Melting part 82 Space 84 Outflow Part 86 Strand Cutter 88 Strand 90 Pellet

Claims (11)

In the barrel, a rotating shaft that extends in the longitudinal direction of the barrel,
It has a screw element that fits externally to the rotating shaft, and has.
A supply unit that supplies the oil-containing solid material into the barrel, an oil-squeezing unit that squeezes oil from the oil-containing solid material supplied by the supply unit, an oil recovery unit that recovers the squeezed oil, and the oil-squeezing unit. A heating unit is provided to heat the oil-containing solid material so that it is in a softened state to a temperature equal to or lower than the melting point of the solid material or the allowable heating temperature of the oil before being squeezed.
The oil squeezing portion has a transporting portion and a squeezing portion arranged adjacent to each other in the longitudinal direction.
In the transport section, the pair of screw elements are transport screw elements capable of transporting an oil-containing solid material to the downstream side in the longitudinal direction of the barrel.
In the squeezing portion, the screw element is a squeezing screw element capable of squeezing an oil-containing solid material.
The oil recovery unit is provided laterally with respect to the longitudinal direction of the barrel so that only the squeezed oil accumulated in the lower part of the barrel can be recovered, and the barrel is provided with the squeezing screw element. An oil outflow opening is provided in the vicinity,
Further, an extrusion section for extruding the solid material after oil extraction is provided on the downstream side of the oil extraction section.
The extruded portion is provided with a melting portion that heats the solid material after oil extraction to a molten state.
The solid material extruded to the outside in a strand shape by the extruded portion is cut into a pellet product.
An oil squeezing and pelletizing device that is characterized by this. The barrel is a eyebrows shape in which two cylindrical cylinders are connected in parallel in the longitudinal direction and a pair of arcs are connected in a cross section orthogonal to the longitudinal direction.
Each of the rotary shafts extends longitudinally concentrically with the cylindrical cylinder within the corresponding cylindrical cylinder.
It is a two-axis rotating shaft that can rotate in the same direction around the longitudinal direction and is separated from each other by a predetermined distance.
The screw elements are paired with each other and are fitted to each of the two-axis rotating shafts.
The pair of screw elements are identical to each other, are provided at the same position in the longitudinal direction of the barrel, and are arranged so as to mesh with each other at a predetermined distance between the rotating shafts of the two axes.
The oil squeezing and pelletizing apparatus according to claim 1. The flow path cross-sectional area of the oil-containing solid material formed between the outer surface of the squeezing screw element and the inner surface of the barrel is formed between the outer surface of the transport screw element and the inner surface of the barrel. It is set smaller than the flow path cross-sectional area of the oil-containing solid material.
The oil squeezing and pelletizing apparatus according to claim 2. The squeezing screw element has a circular opening into which the rotating shaft fits, discs with two or more chips in the circumferential direction are stacked in the longitudinal direction, and the corresponding inserts of adjacent discs in the longitudinal direction are circumferential. The oil squeezing and pelletizing apparatus according to claim 3, which is a discontinuous type in the longitudinal direction and is offset in the direction, and the center of the circular opening is offset with respect to the center of the barrel. The squeezing screw element has a monolithic shape having a circular opening into which the rotary shaft is fitted, has two or more tips in the circumferential direction on each of both end faces separated in the longitudinal direction, and both ends on the peripheral side surface. The oil squeezing and pelletizing apparatus according to claim 3, wherein a spiral lead connected to a chip on the surface is provided, and the center of the circular opening is offset with respect to the center of the barrel, which is a continuous type in the longitudinal direction. .. 6. Oil extraction and pelletization equipment. The oil recovery unit is provided with a casing that is communicated with and connected to the oil outflow opening and has an oil recovery opening, and a screw that is provided in the casing and rotates in a direction toward the oil outflow opening. The oil-squeezing and pelletizing apparatus according to claim 1, wherein the oil to be squeezed is recovered through the oil-recovering opening, and the squeezed oil-containing solid material is not recovered. The oil-squeezing and pelletizing apparatus according to any one of claims 1 to 7, wherein the oil-containing solid material is an industrial waste material of a thermoplastic resin. The oil-containing solid material impregnated with oil in the solid material is continuously transported in the forward direction in the closed space along the extension direction of the closed space, and the lower of the melting point of the solid material or the allowable heating temperature of the oil is lower. At the stage of heating the oil-containing solid material to a softened state to below the temperature,
By forming a pressure barrier on the downstream side of the closed space, the oil-containing solid material is squeezed while increasing the filling degree of the heated oil-containing solid material in the closed space on the upstream side of the pressure barrier, and the oil content is squeezed only by squeezing. The stage of oil extraction and
At the stage of continuously recovering the squeezed oil, melting the squeezed solid material and pushing it out in a strand shape,
The stage of cutting the solid material extruded to the outside and pelletizing it,
An oil-squeezing and pelletizing method characterized by having. The oil-squeezing and pelletizing method according to claim 9, wherein the pelletization step is performed by air-cooling or water-cooling the solid material extruded to the outside so that it can be cut into predetermined lengths in the longitudinal direction, and then cutting the solid material. The oil-squeezing and pelletizing method according to claim 9, wherein the oil-containing solid material is an industrial waste material of a thermoplastic resin.

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