JP2936240B2 - Crushing method of synthetic resin coated steel rod - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to shorten a synthetic resin-coated steel rod used for a pillar for agricultural and horticultural purposes, a coated steel wire for a fence, and other building materials, and to reduce the length of the steel rod portion and the coated portion. The present invention relates to a crushing method for separating and separating.

[0002]

2. Description of the Related Art Recently, various problems regarding the disposal method of industrial waste and its recycling have been proposed, and new proposals on these problems have been actively made. Under these circumstances, the method of disposal and recycling of used agricultural and horticultural supports and scraps of agricultural and horticultural supports left in the factory and coated steel rods such as coated steel wires for fences are also considered. It is required to take effective measures for resource utilization.

As shown in FIG. 5, a synthetic resin-coated steel rod used for an agricultural or horticultural support or a fence is composed of a steel rod 1 as a core material, a synthetic resin coating layer 2 of polyvinyl chloride resin and an adhesive layer 3. The steel rod 1 is a steel pipe having a seam 4 welded as shown, a steel pipe without a seam, a solid thick steel wire, a wire, or the like. In addition, there is also a coating layer formed of a polyethylene resin,
Many of them do not have the adhesive layer 3.

[0004]

In the case of treating such a synthetic resin-coated steel rod, the steel rod 1 and the coating layer 2 remain adhered if the steel rod 1 is simply crushed for a short period of time. Is difficult. That is, the synthetic resin-coated steel rod 1
Fracturing the steel bar and separating the steel bar and the coating from each other help to facilitate their recycling.

[0005] The inventor of the present application has conducted intensive studies and as a result, according to a certain crushing apparatus having a rotary blade and a fixed blade, the steel rod portion of the synthetic resin-coated steel rod having the structure described in FIG. And the coating part can be separated and separated to some extent.

SUMMARY OF THE INVENTION The present invention has been made under the above circumstances, and is intended to crush a synthetic resin-coated steel rod into a short length by using a crushing device having a rotary blade and a fixed blade, It is an object of the present invention to provide a method for crushing a synthetic resin-coated steel rod, which can surely perform separation and separation of a part.

[0007]

According to a first aspect of the present invention, there is provided a method for crushing a synthetic resin-coated steel rod, comprising: a plurality of rotary blades having blade portions spirally arranged on a rotary shaft; A synthetic resin-coated steel rod of a predetermined length is charged into a crushing device including a fixed blade provided in front of the crusher and a screen disposed below the crushing region by the rotating blade and the fixed blade. The rotary blade and the fixed blade cooperate to shorten the length of the synthetic resin-coated steel rod, and peel off the steel rod and the coating of the synthetic resin-coated steel rod. Is dropped on the screen, the processed material that has passed through the mesh of the screen is discharged from the crushing device, and the processed material that does not pass through the mesh of the screen is circulated to the crushing treatment area.

According to a second aspect of the present invention, in addition to the structure described in the first aspect, the screen mesh size is made to correspond to the outer diameter of the synthetic resin-coated steel rod. Things.

[0009]

According to the method for crushing a synthetic resin-coated steel rod according to the first aspect of the present invention, in a crushing process area of a crushing device, a rotary blade and a fixed blade spirally arranged in parallel with a rotary shaft form a predetermined length. Processes such as crushing, screw cutting, crushing, and tearing of synthetic resin-coated steel rods are performed in a mixed manner. During these processes, shortening processing to shorten the synthetic resin-coated steel rods, Is repeatedly performed. In addition, the processed material that has passed through these processes is sieved into those that pass through the screen and those that do not pass through the screen, and those that do not pass through are repeatedly subjected to the shortening process and the peeling process again in the crushing process area. .

Further, according to the method of the first aspect, most of the processed material that does not pass through the mesh of the screen is in a state where the steel rod portion and the coating portion are adhered without being completely peeled off. The size is larger as the outer diameter of the steel bar in the synthetic resin-coated steel bar is larger. Therefore, when the size of the mesh of the screen is made to correspond to the outer diameter of the steel rod of the synthetic resin-coated steel rod as in the method of claim 2, the steel rod portion and the coating portion are attached. Processing material can be reliably circulated to the crushing area of the crusher,
This helps to reliably separate and separate the steel bar and the coating.

[0011]

FIG. 1 is a structural view of a crushing apparatus 10 used in an embodiment of the method of the present invention. The method of the present invention uses the crushing apparatus 10 shown in FIG. 1 to shorten a synthetic resin-coated steel rod having a predetermined length. Treatment, and a peeling treatment of the steel rod portion and the coating portion of the synthetic resin-coated steel rod is performed, the processed material having passed through these processes is dropped on a screen, and the processed material that has passed through the mesh of the screen is subjected to the crushing device. From the screen and circulate through the crushing zone the processed material that does not pass through the screen mesh.

The crushing apparatus 10 has a plurality of rotary blades 20 provided with blade portions 21 at a plurality of positions in the rotation direction. The rotating blades 20 are arranged side by side with the rotating shaft 30 being slightly shifted in phase, so that the blade portions 21 of the rotating blades 20 are spirally arranged in the axial direction of the rotating shaft 30. A plurality of fixed blades 41, 42, 43, 44 are provided so as to face the rotation path R of each rotary blade 20. The distance between the fixed blades 41 to 44 and the rotation path R of the rotary blade 20 corresponding to each of the fixed blades 41 to 44 is the fixed blade 41.
44, the distance between the fixed blade 41 near the inlet 50 and the rotation path R is the widest, and the fixed blade 41 is located on the front A side in the rotation direction of the rotary blade 20 from the fixed blade 41. 42, 43, 44 are gradually narrower,
The interval between the fixed blade 44 at the last stage and the rotation path R is extremely small, and is in a state of apparently touching.

In this crushing apparatus 10, a crushing treatment area S
Are formed by areas where the rotary blades 20 and the fixed blades 41 to 44 are installed. Reference numeral 70 denotes a discharge chute.

While operating such a crushing apparatus 10,
A synthetic resin-coated steel rod having a predetermined length is introduced into the crushing treatment area S from the input port 50, and crushing action, screw cutting action, and crushing of the coated steel rod are performed by the cooperation of the rotary blade 20 and the fixed blades 41 to 44. When various physical and mechanical actions such as action and tearing action are repeatedly performed in any order, these actions shorten the coated steel rod and shorten the coated steel rod. The processing is repeated. That is, the coated steel bar having a predetermined length is
Between the fixed blades 41 to 44 and sheared,
Because the twisted, crushed, stretched, torn, and other actions involving deformation are performed, the coated steel bar having a predetermined length is cut shorter, and The steel bar portion and the coating portion of the coated steel bar are separated and separated. And the blade part 2 of each rotary blade 20 ...
Are spirally arranged in parallel with the rotary shaft 30, the distance between the rotation path R of the rotary blade 20 and the fixed blades 41 to 44 becomes narrower toward the front A in the rotation direction of the rotary blade 20, and When the interval between the fixed blade 44 and the rotation path R is an extremely narrow interval that is apparently in contact with each other, the shortening process and the peeling process described above are reliably and efficiently performed. In the case of a coated steel rod having a coating layer of polyvinyl chloride resin, there is an advantage that the coating layer is softened or melted by heating due to a temperature rising action during the above-mentioned treatment, and thus is easily peeled.

[0015] Among the processed products thus processed, there are those that have been completely shortened or peeled and those that have not.

A semi-cylindrical screen 6 is provided below the crushing zone S so as to cover a substantially half-circumferential portion of the rotation path R.
The screen 60 and the rotation path R are close to each other. Therefore, the crushing treatment area S
The processed material falling from is received by the screen 60,
The screen 60 separates the processed material that passes through the mesh from the processed material that does not pass through the mesh. And
The processed material that has passed through the mesh of the screen 60 is discharged from the crushing device 50 by a discharge chute 70, and sent to the next step of separating the steel rod portion and the coating portion. Screen 6
The treated material which does not pass through the mesh of No. 0 has a size that cannot pass through the mesh such as a long one, an insufficiently crushed one, a steel bar part and a coating part not completely peeled, and the like. Things are the majority. Such processed material remaining on the screen 60 without passing through the mesh of the screen 60 is
, And is circulated to the crushing treatment area S, and the shortening processing and the peeling treatment are repeated in the crushing treatment area S again. Made on coated steel rods.

By the way, as a result of the investigation, the amount of the material to be dropped from the crushing treatment area S in a state where the steel rod portion and the coating portion are not completely separated but adhered to each other is determined by a predetermined amount supplied from the charging port 50. It has been found that the larger the outer diameter of the steel bar in the above-mentioned coated steel bar, the larger the length. For this reason, if the size of the mesh of the screen 60 is made to correspond to the outer diameter of the coated steel rod, the processed material in which the steel rod portion and the coating portion are adhered to each other can be processed in the crushing area of the crushing device. And the steel bar portion and the coating portion can be reliably separated and separated. Specifically, a mesh of a rectangular or rectangular shape whose side length is about 3 to 10 mm larger than the outer diameter of the steel rod of the above-mentioned coated steel rod of a predetermined length to be thrown in from the input port 50, or a size corresponding thereto When the processed material is received by the screen 60 having a diamond-shaped mesh and a round mesh, a material having a long length, an insufficiently crushed material, and a material in which the steel rod portion and the coating portion are not completely peeled off. Are reliably circulated to the crushing zone S by the rotary blades 20. In this case, if the mesh of the screen 60 is too large, the processed material that has not been subjected to the shortening process or the peeling process is likely to pass through the mesh and be discharged. On the other hand, if the mesh of the screen 60 is too small, the processed material that has been completely shortened and peeled is circulated together with the insufficiently processed material, so that the processing efficiency is reduced and the fineness is too small. Separation becomes difficult.

FIG. 2 shows the crushing apparatus 10 described with reference to FIG.
In the crushing apparatus 10 described above, the crushing apparatus 10 'in which the mesh of the screen 60 is smaller than that of the crushing apparatus 10' is installed in two stages, and the processed product processed as in the above-described embodiment using the crushing apparatus 10 in the preceding stage is used. FIG. 9 is a processing flow diagram in which the subsequent crushing apparatus 10 ′ performs the same processing. In the figure, reference numeral 81 denotes a cutting machine, which is installed to cut the coated steel bar into a predetermined length one after another. Reference numeral 82 denotes a charging conveyor, which is provided to carry the coated steel bar M obtained by cutting into a predetermined length by the cutting machine 81 into the hopper 83 of the crushing apparatus 10.
Reference numeral 83 is provided to carry the processed material discharged from the crushing device 10 at the preceding stage to the sorting device 84 at the preceding stage. The separation device 84 includes a magnetic attraction type conveyor 85, and the conveyor 85 adsorbs the steel bar portion from which the coating portion is completely peeled off and the steel bar portion where the coating portion remains attached. It is put into the hopper 86 of the crushing device 10 'at the subsequent stage. Also,
The covering part peeled off from the steel rod part in the former crushing device 10 is collected in a collecting container 87 as resin waste. Crusher 1 at the latter stage
The treated material discharged from the 0 'is conveyed to a subsequent separation device 89 by a conveyor 88, and the steel rod portion is moved by a magnetic attraction type conveyor 89.
In (a), it is collected in the iron scrap collecting container 89b, and the covering portion is collected as resin scrap in the collecting container 89c.

In the method shown in FIG. 2, the mesh of the screen of the former crushing apparatus 10 is a square mesh having a side of 50 mm, and the mesh of the screen of the latter crushing apparatus 10 'is a square mesh having a side of 15 mm. After cutting a synthetic resin-coated steel rod obtained by coating a steel pipe having an outer diameter of about 6 mm and an outer diameter of 6 to 24 mm with a polyvinyl chloride resin to about 60 cm, and then performing a treatment, the treated material discharged from the crushing apparatus 10 in the former stage is The steel rod portion and the coating portion were separated in a state close to 100%. In addition, the processed material discharged from the subsequent crusher was further shortened and shortened.

FIG. 3 schematically shows a typical appearance of the separated steel rod portion 1 '. The steel bar 1 ′ was crushed into a flat plate, the surface of which had a polished luster, and had traces of tears and burns on its ends. FIG. 4 schematically shows a typical appearance of the separated covering portion 2 ′. Although the coating 2 'was developed, it still had a roundness, and traces of tearing off, hardening after melting, and scratches were left on the ends and surfaces. In addition, it was found that the steel rod portion 1 'and the coating portion 2' in the processed material were relatively uniform in size, and were easy to handle in the recycling process.

[0021]

According to the method for crushing a synthetic resin-coated steel rod according to the present invention, the synthetic resin-coated steel rod can be shortened,
The steel rod and the coating can be reliably separated and separated, and the metal rod and the synthetic resin coating can be recovered and recycled. This has the effect of making it very easy to make

[Brief description of the drawings]

FIG. 1 is a structural diagram of a crushing device used in the method of the present invention.

FIG. 2 is a flow chart of a processing apparatus in which the crushing apparatus performs processing in two stages.

FIG. 3 is a schematic perspective view of the appearance of a separated steel rod portion.

FIG. 4 is a schematic perspective view of the appearance of a separated covering portion.

FIG. 5 is a cross-sectional view of a synthetic resin-coated steel rod.

[Explanation of symbols]

 Reference Signs List 1 'steel rod portion 2' coating portion 10, 10 'crushing device 20 rotary blade 21 blade portion 30 rotary shaft 41, 42, 43, 44 fixed blade 60 screen R rotary blade rotation path S crushing treatment area M synthetic resin coated steel rod

────────────────────────────────────────────────── ─── Continuing from the front page Examiner Hisao Suzuki (56) References JP-A-59-4455 (JP, A) JP-A-52-5051 (JP, A) JP-A-58-205550 (JP, A) 1983-15019 (JP, U) JP-A 53-126966 (JP, U) JP-A 48-111960 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B02C 18 / 00-18/44

Claims (2)

(57) [Claims] 1. A plurality of rotary blades having blade portions spirally arranged on a rotary shaft, a fixed blade provided facing a rotary path of the rotary blade, and a lower portion of a crushing process area by the rotary blade and the fixed blade. A crushing device provided with a screen disposed therein, a synthetic resin-coated steel rod of a predetermined length is charged, and the synthetic resin-coated steel rod is shortened by the cooperation of a rotary blade and a fixed blade in the crushing treatment area. ,
The steel rod portion and the coating portion of the synthetic resin-coated steel rod are subjected to peeling treatment, the processed material that has passed through these processes is dropped on the screen, and the processed material that has passed through the screen mesh is discharged from the crushing device. A method for crushing a synthetic resin-coated steel rod, wherein the material that does not pass through the screen mesh is circulated to the crushing area. 2. The method for crushing a synthetic resin-coated steel rod according to claim 1, wherein the screen mesh size is made to correspond to the outer diameter of the steel rod of the synthetic resin-coated steel rod.