JP2020015594A - Reserve structure - Google Patents

Abstract

To provide a reserve structure capable of improving the efficiency of molding work.SOLUTION: A reservoir unit 25 (reserve structure) has a reservoir case 23 that reserves a crushed material and a screw (first screw 231, second screw 232, third screw 233) rotatably provided within the reservoir case 23 in a manner to move the crushed material within the reservoir case 23. The reservoir unit 25 further comprises a suction nozzle 235 that protrudes into the reservoir case 23 and sucks the crushed material. The first screw 231 is arranged on an upper side, and the second screw 232 and the third screw 233 are respectively arranged on a lower side distant horizontally a predetermined distance from the first screw 231. The first screw 231 has a flight component protruding diametrically outwardly, and the suction nozzle 235 is arranged between the second screw 231 and the third screw 233.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a storage structure.

  BACKGROUND ART Conventionally, in molding a resin material such as a blow molding machine or an injection molding machine, the yield is improved by mixing and molding a virgin resin material and a recovered resin material. For example, Patent Document 1 discloses a manufacturing method in which a virgin resin material and a recovered resin material are mixed to produce a foam molded product by blow molding.

WO2013 / 111892

  Here, the recovered resin material is formed into a predetermined size (such as a particle size of about 5 mm to 10 mm) by crushing waste materials such as burrs and runners of a product at the time of molding. The pulverized material (pulverized material) is stored in the storage case, is sucked from a suction nozzle in the storage case, and is mixed with the virgin resin material. In the pulverized material stored in the storage case, a powdered pulverized material having a particle size of about 1 mm to 2 mm is mixed at a predetermined ratio during pulverization. Then, the pulverized material around the suction nozzle is sucked, a cavity is formed around the suction nozzle, and the pulverized pulverized material meshes and solidifies between the pulverized materials of a predetermined size around the cavity, a so-called bridge. Is formed. The formed bridge stops the machine and loosens it by hand, which is considered to be a cause of a reduction in the efficiency of the molding operation. In particular, in the case of a foamed material, this bridge sometimes appears remarkably.

  An object of the present invention is to provide a pulverized material storage structure capable of improving the efficiency of a molding operation.

  The storage structure of the present invention includes a storage case for storing the crushed material, and a screw rotatably provided in the storage case so as to move the crushed material in the storage case.

  ADVANTAGE OF THE INVENTION According to this invention, the storage structure which can improve the efficiency of a shaping | molding operation can be provided.

1 is a schematic diagram illustrating a blow molding system including a crusher according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view illustrating a crusher according to an embodiment of the present invention, illustrating a cross section taken along line II-II of FIG. 3. FIG. 3 is a schematic cross-sectional view showing a crusher according to an embodiment of the present invention, showing a cross section taken along line III-III of FIG. 2. It is a perspective view showing typically arrangement of the 1st, 2nd, 3rd screw and a suction nozzle in a grinder concerning an embodiment of the present invention. It is a figure showing the modification of the flight part of the crusher concerning the embodiment of the present invention.

  Next, an embodiment of the present invention will be described. FIG. 1 is a schematic diagram of the blow molding system 1. The blow molding system 1 includes a blow molding machine 10 and a crusher 20. The blow molding system 1 crushes waste materials such as burrs generated at the time of molding by the blow molding machine 10 with a crusher 20 to generate crushed materials. The pulverized material (recovered resin material) is recovered from the pulverizer 20, mixed with the virgin resin material, and used for blow molding by the blow molding machine 10 again.

  The blow molding machine 10 includes a mixer 11 that forms a mixed resin material in which a virgin resin material and a recovered resin material are mixed at a predetermined ratio. The mixer 11 communicates with the extruder 12, and the mixed resin material is appropriately supplied to the extruder 12 by opening and closing an opening and closing cylinder 11a provided on the communication path. A head 13 is provided at the tip of the extruder 12. The mixed resin material supplied to the extruder 12 is heated and kneaded inside the extruder 12, and the parison 13a is formed by the head 13. The parison 13a is formed into a product by a blow molding die 50. The molded product in the present embodiment is a duct or the like, and is formed by foam molding having a closed cell structure.

  The crusher 20 has a storage structure formed by a hopper 21 having an input port for inputting waste material, a crushing unit 22 for crushing waste material to generate crushed material, a storage case 23 for storing crushed material, a screw described later, and the like. The storage unit 25 is provided. The hopper 21, the crushing unit 22, and the storage unit 25 are formed by stacking, and are formed so that the material sequentially falls in the crusher 20. A caster 24 is provided on the lower surface of the storage case 23. The storage case 23 communicates with the mixer 11 of the blow molding machine 10 through the communication passage 31. The mixer 11 is connected to a communication path 32 connected to a pressure reducing pump (not shown). The pulverized material stored in the storage case 23 is charged into the mixer 11 through the communication path 31 by reducing the pressure inside the mixer 11 by the pressure reducing pump. On the other hand, the mixer 11 is connected to the material supply device 40 via the communication path 33. The material supply device 40 supplies the virgin resin material to the mixer 11.

  The predetermined ratio of mixing the recovered resin material and the virgin resin material in the mixer 11 is appropriately set according to the molded product. In the present embodiment, the ratio between the recovered resin material and the virgin resin material is set to 8: 2.

  Next, the crusher 20 will be described in detail. As shown in the schematic cross-sectional views of FIGS. 2 and 3 in which the hopper 21 is omitted and the crushing unit 22 and the storage unit 25 (storage structure) are mainly shown, the rotary blade 221 is rotatably held in the crushing unit 22. Is done. The rotary blade 221 has a plurality of blades 221a formed on a shaft. A mesh 222 is provided below the rotary blade 221. The lower part of the mesh 222 communicates with the storage case 23. The rotary blade 221 is continuously rotated by a motor (not shown). The rotation direction of the rotary blade 221 is the direction D1 in FIG. 2 so that the waste material can be cut by the blade 221a. The waste material supplied from the hopper 21 is pulverized by the blade 221 a so as to be sandwiched between the rotary blade 221 and the mesh 222, and falls into the storage case 23. In the present embodiment, the particle size of the pulverized material is about 5 mm to 10 mm. At this time, about 5 to 10% of a powdery pulverized material having a particle size of about 1 mm to 2 mm is also included.

  The storage case 23 is formed in a box shape with an open upper part, and has side walls 23a to 23d standing on four sides. In the storage case 23, a first screw 231, a second screw 232, and a third screw 233, which are three screws, are rotatably arranged in parallel with each other in the axial direction. In the present embodiment, the winding directions of the blade screws of the first screw 231, the second screw 232, and the third screw 233 are all clockwise. One end of each of the first screw 231, the second screw 232, and the third screw 233 is one of the side walls 23a and 23b of the storage case 23 that is orthogonal to the axial direction of the first screw 231, the second screw 232, and the third screw 233. It is rotatably supported by one side wall 23a which is a supporting side wall. The other ends of the first screw 231, the second screw 232, and the third screw 233 are connected to and supported by gears (not shown) in the gear box 234. One or a plurality of motors are built in the gear box 234, and rotate the first screw 231, the second screw 232, and the third screw 233.

  The arrangement of the first screw 231, the second screw 232, and the third screw 233 is such that the first screw 231 is on the upper side, the second screw 232 and the third screw 233 are below the first screw 231, and Are arranged in the storage case 23 at positions spaced apart from each other by a predetermined distance in the horizontal direction. In other words, the first screw 231, the second screw 232, and the third screw 233 are viewed from the axial direction as shown in FIG. 3, and each of the axes has a triangular shape in which the axis of the first screw 231 is the upper apex. The first screw 231, the second screw 232, and the third screw 233 are disposed in the storage case 23. In addition, a flight portion 231a that protrudes radially outward is provided on one end side of the first screw 231. The flight part 231a is formed in a flat bar shape. The flight portions 231a are provided as a pair facing each other at the same axial position on the axis of the first screw 231.

  The side wall 23a is provided with a suction nozzle 235 projecting into the storage case 23 and sucking the pulverized material. As shown in FIG. 4, the suction nozzle 235 is formed by a cylindrical pipe, and the axial direction is set to the same direction as the first screw 231, the second screw 232, and the third screw 233. The height direction is the same as the axial height of the second screw 232 and the third screw 233. The suction nozzle 235 is disposed at a central position between the second screw 232 and the third screw 233. The suction nozzle 235 has an opening 235a at the tip end formed in an oblique cut shape. The suction nozzle 235 is arranged such that the inclined opening surface 235b of the opening 235a (that is, the surface including the cut surface where the pipe is inclined and the opening) faces upward. The above-mentioned flight portion 231a is disposed substantially directly above the opening 235a, corresponding to the opening 235a of the suction nozzle 235. Accordingly, it is possible to suppress the formation of a bridge that is easily formed above the opening 235a in which the suction nozzle 235 sucks the crushed material.

  The suction nozzle 235 is connected to the communication path 31 and communicates with the mixer 11. In the communication passage 31, a suction force adjusting portion 31 a capable of adjusting the suction force of the suction nozzle 235 is formed near the outside of the side wall 23 a of the storage case 23. In the present embodiment, the suction force adjusting portion 31a is formed by a hole formed in the communication passage 31 and a C-ring capable of adjusting the opening area of the hole. For this reason, the communication path 31 is formed of a pipe material in the vicinity of the suction force adjusting section 31a, and is connected to the mixer 11 by a flexible hose.

  The arrangement of the first screw 231, the second screw 232, the third screw 233, and the suction nozzle 235 in the storage case 23 is as shown in a perspective view schematically shown in FIG.

  In the pulverization of the waste material, first, the waste material is put into the hopper 21. Then, the waste material falls into the crushing unit 22. The waste material dropped into the crushing unit 22 is crushed by the rotary blade 221 and the mesh 222 to be crushed material. This pulverized material is accumulated and stored in the storage case 23 via the mesh 222. The level at which the pulverized material accumulates in the storage case 23 (the height in the storage case 23) has the lower limit near the axis of the second screw 232 and the third screw 233, and the upper limit is such that it does not overflow from the storage case 23. , The mesh 222 is not touched. The reason for setting the lower limit of the level of the pulverized material in this way is that the screw blades of the second screw 232 and the third screw 233 must be buried in the pulverized material by half or more to be pulverized by the second screw 232 and the third screw 233. This is because it is difficult to move the material, and it is not possible to collect the crushed material around the suction nozzle 235. It goes without saying that the upper limit of the level of the crushed material is set so as not to overflow from the storage case 23, but it is important to set the crushed material so as not to touch the mesh 222. This is because when the crushed material comes into contact with the mesh 222, the crushed material melts around the rotary blade 221 and the crushed material hardens.

  The first screw 231 is driven to rotate in the counterclockwise direction D2 as viewed from the axial direction on one end side as shown in FIG. On the other hand, the second screw 232 and the third screw 233 are driven to rotate in the clockwise direction D3 which is the opposite direction to the first screw 231. Therefore, the first screw 231 is formed so as to move the pulverized material from one end side to the other end side as shown by the arrow Y1, and the second screw 232 and the third screw 233 are the other as shown by the arrow Y2. It is formed to move the crushed material from one end to one end. In this way, since the crushed material in the storage case 23 moves so that the crushed material finally collects around the suction nozzle 235, the formation of a cavity around the suction nozzle 235 is reduced.

  The first screw 231 is provided with a flight part 231 a and rotates together with the first screw 231. This is because when a cavity is formed around the suction nozzle 235, the crushed material around the cavity may be fixed, but the crushed material fixed by the flight portion 231a can be crushed, Further, the adhesion of the pulverized material can be reduced. The adhesion of the pulverized material (so-called bridge) tends to occur particularly in a foamed material having a closed-cell structure, but the above configuration suppresses the generation of the bridge. Therefore, the working efficiency of blow molding can be improved.

  The flight part 231a is not only provided in a pair facing the same position on the axis of the first screw 231 but also offset and provided on the axis of the first screw 231 like the flight part 231b shown in FIG. Can also. The arrangement of the flight sections 231a and 231b can be appropriately set according to the location where the above-mentioned bridge is likely to occur. In addition, the rotation of the first screw 231 can be balanced by providing the flight portions 231a and 231b in a pair.

  The embodiments of the present invention have been described above, but the present invention is not limited to the embodiments and can be implemented with various changes. For example, in the present embodiment, a configuration including three screws (the first screw 231, the second screw 232, and the third screw 233) is shown. However, the present invention is not limited to this, and the number of screws may be one, two, four or more. You can also. Further, the first screw 231, the second screw 232, and the third screw 233 are all formed in a right-handed direction, but the present invention is not limited to this. The first screw 231, the second screw 232, and the third screw 233 are formed in the storage case 231. The winding direction and the rotation direction may be set so that the flow of the pulverized material is formed inside. As in the present embodiment, the first screw 231 moves the pulverized material from one end to the other end, and the second screw 232 and the third screw 233 move the pulverized material from the other end to one end. With such a configuration, the pulverized material can be efficiently collected around the suction nozzle 235 disposed on one end side.

  In the present embodiment, one end of each of the first screw 231, the second screw 232, and the third screw 233 is directly supported by the side wall 23a. However, the present invention is not limited thereto. One end of each of the second screw 232 and the third screw 233 may be rotatably supported. Further, the storage unit 25 having the storage structure may be configured separately from the crusher 20. Thereby, the pulverized material generated in another place can be carried and stored in the storage unit 25 which is a separate body.

Reference Signs List 1 blow molding system 10 blow molding machine 11 mixer 11a opening and closing cylinder 12 extruder 13 head 13a parison 20 crusher 21 hopper 22 crushing section 23 storage cases 23a to 23d side walls 24 casters 25 storage section 31 communication path 31a suction force adjusting section 32 Communicating passage 33 Communicating passage 40 Material supply device 50 Mold 221 Rotary blade 221a Blade 222 Mesh 231 First screw 231a Flight unit 231b Flight unit 232 Second screw 233 Third screw 234 Gear box 235 Suction nozzle 235a Opening 235b Opening surface

Claims (11)

A storage case for storing the crushed material,
A screw rotatably provided in the storage case so as to move the crushed material in the storage case,
A storage structure comprising: A suction nozzle protruding into the storage case and sucking the crushed material,
The storage structure according to claim 1, wherein the screw has a flight portion protruding radially outward.   The storage structure according to claim 2, wherein the flight portion is arranged corresponding to an opening of the suction nozzle.   4. The storage according to claim 2, wherein the suction nozzle is formed in a pipe shape having an opening portion inclined and cut, and the opening surface of the opening portion is oriented upward. 5. Construction.   The storage structure according to any one of claims 1 to 4, wherein the screw includes a first screw, a second screw, and a third screw that are axially parallel to each other. The first screw is disposed on an upper side, the second screw and the third screw are disposed below a predetermined distance horizontally from the first screw, respectively,
A suction nozzle protruding into the storage case and sucking the crushed material is disposed between the second screw and the third screw,
The storage structure according to claim 5, wherein:   The first screw, the second screw, and the third screw are all formed in the same winding direction, and the rotation direction of the first screw is opposite to the rotation direction of the second screw and the third screw. The storage structure according to claim 5, wherein the storage structure is rotated. The suction nozzle is arranged between the second screw and the third screw with the same axial direction as the second screw and the third screw,
The first screw is formed to move the crushed material from one end side to the other end side, and the second screw and the third screw move the crushed material from the other end side to one end side. Formed to
The storage structure according to claim 6, wherein: As for the screw, a first screw, a second screw, and a third screw that are axially parallel to each other are arranged,
4. The storage structure according to claim 2, wherein the flight portion is provided in a pair facing the axis of the first screw. 5.   The storage structure according to claim 9, wherein the pair of flight portions are provided at the same position in the axial direction of the first screw.   The storage structure according to claim 9, wherein the pair of flight portions are provided to be offset in an axial direction of the first screw.

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