JP7670395B1 - Waste tire shredding equipment - Google Patents

Abstract

To provide a waste tire shredding processing device that can prevent broken pieces of a cutter blade that have fallen off a primary crusher from flowing into a secondary crusher and damaging the cutters of the secondary crusher.
[Solution] The waste tire crushing processing device of the present invention comprises a primary crusher that crushes waste tires into primary fragments of 5 to 10 cm in size using a two-axis driven cutter; an X-ray sorter that irradiates the primary fragments with X-rays and separates and removes broken pieces of cutter blades that are damaged during the primary crushing and fall off from the primary crusher; a secondary crusher that crushes the primary fragments that pass through the X-ray sorter without being separated and removed into secondary fragments of 1 to 3 cm in size using a one-axis driven cutter; and a magnetic sorter that separates fragments including wires from the secondary fragments.
[Selected Figure] Figure 1

Description

The present invention relates to a waste tire shredding processing device, and more specifically, to a waste tire shredding processing device that can prevent the secondary shredding cutter from being damaged by broken pieces of the cutter blade mixed in with the crushed pieces of the waste tire after the primary shredding when the waste tires are subjected to the primary and secondary shredding.

Patent Document 1 describes cutting waste tires to use them as fuel. The size of waste tires suitable for use as fuel is said to be about 1 inch (= about 2.5 cm). In addition, magnetic sorting is performed to suppress the wire remaining rate to about 5 to 7%. As shown in FIG. 9, a tire has beads 9 made of wires (steel wires). In Patent Document 1, the beads 9 of the waste tires are not removed before they are fed into the rough cutter, so the cutter is heavily burdened. Even if the beads 9 are removed, the carcass 39 and belt 40 inside the tire contain many wires (steel wires), so the cutter is heavily burdened. These wires are thin, with a diameter of 0.2 mm, but are twisted wires, and for example, the diameter of nine twisted wires is 0.82 mm. If broken pieces of the blade of the cutter that constitutes the rough cutter flow downstream, the cutter of the fine cutter may be damaged.

The waste tire recycling method of Patent Document 2 shows a bead removal process using a bead remover. In addition, a crusher with a two-stage biaxial drive cutter is used in the primary crushing process. In the secondary crushing process after the primary crushing process, a single-axis drive cutter consisting of a fixed blade section and a rotary blade section is used. The beads of the waste tire are removed by the bead remover shown in Figure 2, and then the waste tire is divided into multiple pieces in the circumferential direction by a dividing and cutting machine, which are then fed into the biaxial drive cutter in the primary crushing process. If the blade of the biaxial drive cutter in the primary crushing process breaks, the broken pieces may flow to the single-axis drive cutter in the downstream secondary crushing process, damaging the single-axis drive cutter.

JP 2004-309033 A JP 2003-220349 A

The object of the present invention is to provide a waste tire shredding and processing device that can prevent the cutters of the secondary crusher from being damaged by broken pieces of the cutter blade that fall off from the primary crusher when shredding waste tires.

The waste tire shredding processing device according to the present invention is characterized by comprising a primary crusher that crushes waste tires into primary fragments of 5 to 10 cm size using a two-shaft driven cutter, an X-ray sorter that irradiates the primary fragments with X-rays and separates and removes broken pieces of the cutter blade that are damaged in the primary crushing and fall off the primary crusher, a secondary crusher that crushes the primary fragments that pass through the X-ray sorter without being separated and removed into secondary fragments of 1 to 3 cm size using a one-shaft driven cutter, and a magnetic sorter that separates fragments containing wires from the secondary fragments.

The two-axis drive cutter is characterized in that a disk body with multiple cutter blades is stacked on each drive shaft, and the cutter blades are arranged in a spiral shape along the axial direction.

A bead remover is arranged upstream of the primary crusher, and the bead remover and the primary crusher are arranged in parallel.

The tire shredding processing device of the present invention has an X-ray sorting device placed between a primary crushing device that crushes waste tires into pieces 5 to 10 cm in size and a secondary crushing device that crushes the pieces into pieces 1 to 3 cm in size, and irradiates the primary crushed pieces with X-rays to separate and remove broken pieces of cutter blades that break and fall off during the primary crushing, preventing the cutters of the secondary crusher from being damaged by broken pieces of the cutter blade.

The two-axis drive cutter has multiple disks with cutter blades stacked on each drive shaft, and the cutter blades are arranged in a spiral along the axial direction, which reduces the strain on the cutter blades. In addition, even if the cutter blade breaks, it can be repaired by replacing the disks, reducing repair costs.

Because the bead remover and primary crusher are arranged in parallel, even if the two-shaft drive cutter of the primary crusher breaks down, operation can continue with the other bead remover and primary crusher. Even if the bead remover breaks down, operation can continue with the other bead remover and primary crusher.

1 is an overall configuration diagram of a waste tire crushing and processing apparatus according to the present invention. FIG. FIG. 4 is an explanatory diagram of a primary crusher installed downstream of the bead remover. FIG. 2 is a plan view of a two-shaft drive cutter provided inside the primary crusher. FIG. 2 is an explanatory diagram of an X-ray sorter installed downstream of the primary crusher. FIG. 2 is a structural diagram of a secondary crusher installed downstream of the X-ray sorting machine. FIG. 2 is a structural diagram of a magnetic separator installed downstream of the secondary crusher. 1 is a flowchart showing a flow of a crushing process for waste tires. FIG. 1 is a cross-sectional view showing a structure of a tire.

The waste tire shredding and processing device according to the present invention will be described below with reference to the drawings.

FIG. 1 is an overall configuration diagram of a waste tire shredding processing device 100 according to the present invention. Waste tires 1 are fed into the bead removers 2 installed in parallel. The waste tires 1 are fed by a feed conveyor 12. The waste tires 1 leaving the bead removers 2 are fed into the primary crushers 3 installed in parallel. Since the bead removers 2 and the primary crushers 3 are arranged in parallel, operation can be continued even if one of them breaks down. The primary crushed pieces discharged from the two primary crushers 3 are merged and fed into the X-ray sorter 4. The X-ray sorter 4 detects and separates the broken pieces 25 of the cutter blade of the primary crusher 3. The shape of the broken pieces 25 is not fixed, but as long as the length and width of the broken pieces 25 are both 1 to 6 cm, that is, the predetermined area is 1 to 36 ^cm2 , they can be distinguished from metal wires and separated. This makes it possible to prevent the broken pieces 25 of the cutter blade from flowing into the secondary crusher 5.

The primary crushed pieces that leave the X-ray sorter 4 are fed into the secondary crusher 5. In the secondary crusher 5, the primary crushed pieces are cut even finer into secondary crushed pieces. The secondary crushed pieces discharged from the secondary crusher 5 are fed into the magnetic separator 6. The magnetic separator 6 separates the secondary crushed pieces into wire-containing crushed pieces 7 and rubber crushed pieces 8. A permanent magnet with a strength of about 1 tesla is used, but there are cases where the wire remaining inside the rubber cannot be removed, in which case the rubber crushed pieces 8 contain some of the wire. Reference numerals 13, 14, 16, and 26 denote delivery conveyors.

Figure 2 is an explanatory diagram (front view) of the bead remover 2. The waste tire 1 is transported vertically by the input conveyor 12. The input conveyor 12 is a chain-driven conveyor, and guides (not shown) are provided on both sides to prevent the waste tire 1 from falling over. When the waste tire 1 enters the bead remover 2, the bead puller 10 is inserted into the central opening of the waste tire 1 and pulls it out toward the rear. As shown in the pull-out circle, two beads 9 are pulled out from one waste tire 1. The waste tire 1 from which the beads 9 have been removed is sent out by the delivery conveyor 13. The bead remover 2 is not necessarily an essential component because the cutting performance of the primary crusher 3 has been improved. The waste tire may be directly input into the primary crusher 3. Even if bead fragments remain, they are eventually removed by the magnetic separator 6, so they do not have a negative effect when used as fuel.

Figure 3 is an explanatory diagram (front view) of the primary crusher 3 installed downstream of the bead remover 2. The waste tires 1 are transported vertically by the transfer conveyor 13. The transfer conveyor 13 is a chain-driven conveyor, and guides (not shown) are provided on both sides to prevent the waste tires 1 from falling over. When the waste tires 1 enter the primary crusher 3, the tire pusher 21 presses the waste tires 1 downwards and brings them into contact with the two-shaft driven cutter 17. When the two-shaft driven cutter 17 starts crushing, the waste tires are bitten and drawn in, so the tire pusher 21 continues to press until the waste tires 1 are drawn in. The waste tires 1 are crushed into primary crushed pieces 18. The size of the primary crushed pieces 18 is about 5 to 10 cm, and after crushing, they are sent out by the transfer conveyor 14.

Figure 4 is a plan view of the two-shaft drive cutter 17 provided inside the primary crusher 3. The two-shaft drive cutter 17 is formed by stacking disc bodies 19 on two parallel shafts. For example, the disc bodies 19 are arranged with four convex cutter blades 20 shifted by 90° from the adjacent blades. This is not limited to this, and two cutter blades 20 may be provided on the outer periphery of the disc body 19. The disc bodies 19 are arranged so that they overlap each other on the two shafts. When viewed from the right side, one of the two shafts rotates right and the other rotates left. The disc bodies 19 are attached clockwise, shifted by, for example, 45° from the adjacent disc body 19 in the axial direction. This is not limited to this, and they may be attached shifted by 30° or 15°. As shown in FIG. 4, when the disks 19 are stacked with a 45° offset, when the cutter blade 20 of the disk 19 at the front right end faces straight up, the disks 19 are stacked so that the cutter blade 20 of the disk 19 one disk to the left is offset 45° clockwise. Therefore, in the plan view of FIG. 4, the number of cutter blades 20 aligned in a straight line in the axial direction is reduced from 12 to half, or 6. In other words, the number of blades that bite into the waste tire 1 at the same time is reduced.

Figure 5 is an explanatory diagram (front view) of the X-ray sorter 4 installed downstream of the primary crusher. Primary crushed pieces 18 discharged from the primary crusher 3 by the transfer conveyor 14 are transported to the X-ray sorter 4. When the primary crushed pieces 18 move to the internal conveyor 15 of the X-ray sorter 4, an X-ray image is taken by the X-ray source 23 and the X-ray line sensor 24, and the presence or absence of broken pieces 25 of the cutter blade that have fallen off the two-axis driven cutter 17 due to damage is inspected. If a broken piece 25 is detected from the X-ray image, it is separated and removed by the sorting plate 35. The remaining primary crushed pieces 18 are sent to the secondary crusher 5 by the transfer conveyor 16.

Figure 6 is a structural diagram (front view) of the secondary crusher 5 installed downstream of the X-ray sorter. The primary crushed pieces 18 sent out from the X-ray sorter 4 by the delivery conveyor 16 are transported to the secondary crusher 5. When the primary crushed pieces 18 move inside the secondary crusher 5, they are pushed out by the push rod 29 and crushed into pieces of about 1 to 3 cm by the fixed blade 28 and the rotating blade 27. The rotating blade 27 is formed in a straight line along the axial direction of the rotating roll 32. There is a mesh screen 30 below the rotating blade 27, and crushed pieces of about 1 to 3 cm in size that pass through it are discharged by the delivery conveyor 26 as secondary crushed pieces 31. Crushed pieces larger than about 1 to 3 cm in size cannot pass through the mesh screen 30, so they are lifted up and cut again. As shown by the drawn circle, the rotating blade 27 of the rotating roll 32 is straight in the axial direction and has a triangular uneven shape.

Figure 7 is a structural diagram (front view) of the magnetic separator 6 installed downstream of the secondary crusher. The secondary crushed pieces 31 sent out from the secondary crusher 5 by the transfer conveyor 26 are transported to the magnetic separator 6. The secondary crushed pieces 31 are dropped from the top of the magnetic separator 6 toward a stainless steel drum 34 equipped with a permanent magnet 33 inside. The stainless steel drum 34 rotates, and the permanent magnet 33 is fixed to the upper right, so the wire-reinforced crushed pieces 7 are changed in trajectory to the left and collected in one of the collection boxes. The rubber crushed pieces 8 are not affected by the permanent magnet 33, so the trajectory is not changed and they are collected in the other collection box. The magnetic separator 6 is not limited to the rotating stainless steel drum 34 equipped with the permanent magnet 33 inside as described above, and may be configured with a permanent magnet built into the sprocket roll of the belt conveyor.

Figure 8 is a flow chart showing the flow of the shredding process of the waste tire shredding processing device according to the present invention. S1 is a process of removing the beads of the waste tires. Each waste tire weighs about 6 to 10 kg. S2 is a process of feeding the waste tires into the primary crusher and performing the primary shredding. The size of the primary shredded pieces is cut to about 5 to 10 cm. S3 is a process of separating and removing the broken pieces of the cutter blade of the primary crusher using an X-ray sorter. S4 is a process of secondary shredding the primary shredded pieces after separating and removing the broken pieces of the cutter blade. The size of the secondary shredded pieces is cut to about 1 to 3 cm. This size is suitable for boiler fuel. S5 is a process of separating and removing wires and shredded pieces containing wires from the secondary shredded pieces using a magnetic sorter. The rubber produced by shredding waste tires contains about 10% steel wires. To use scrap tires as fuel, those that do not contain a lot of wire have better combustion efficiency and produce less iron oxide during combustion. S6 is the process of recovering the crushed rubber pieces separated by the magnetic separator as fuel. The wire is reused as metal. The crushed pieces that contain wire are reused for purposes other than fuel.

The present invention is suitable as a waste tire shredding and processing device that can prevent broken pieces of the cutter blade that have fallen off from the primary shredder from flowing into the secondary shredder and damaging the cutters of the secondary shredder.

REFERENCE SIGNS LIST 1 Waste tires 2 Bead remover 3 Primary crusher 4 X-ray sorter 5 Secondary crusher 6 Magnetic sorter 7 Wire-reinforced crushed pieces 8 Crushed rubber pieces 9 Bead 10 Bead puller 11 Discharge conveyor/feed conveyor 12 Feeding conveyor 13 Transfer conveyor 14 Transfer conveyor 15 Internal conveyor 16 Transfer conveyor 17 Two-axis drive cutter 18 Primary crushed pieces 19 Disc body (cutter)
20 Cutter blade 21 Tire pusher 23 X-ray source 24 X-ray line sensor 25 Broken piece of cutter blade 26 Delivery conveyor 27 Rotating blade 28 Fixed blade 29 Pressing rod 30 Mesh screen 31 Secondary crushed pieces 32 Rotating roll 33 Permanent magnet 34 Stainless steel drum 35 Sorting plate 39 Carcass 40 Belt 100 Waste tire crushing processing device S1 to S6 Processing steps

Claims (2)

A bead remover that removes beads from scrap tires;
a primary crusher that crushes the waste tires from which the beads have been removed into primary crushed pieces having a size of 5 to 10 cm using a two-shaft drive cutter;
an X-ray sorting machine that irradiates the primary crushed pieces with X-rays and separates and removes broken pieces of the cutter blade that are broken in the primary crushing and dropped out of the primary crusher;
a secondary crusher that crushes the primary crushed pieces that have passed through the X-ray sorter without being separated and removed into secondary crushed pieces of 1 to 3 cm in size using a single-axis driven cutter;
a magnetic separator for separating the wire-containing fragments from the secondary fragments;
Equipped with
A transfer conveyor is provided to transport the waste tires vertically to the primary crusher,
The primary crusher includes a tire pusher that presses the waste tires to contact the two-shaft drive cutter,
A waste tire crushing and processing device characterized in that a set of the bead remover and the primary crusher are arranged in parallel, and the primary crushed pieces discharged from the parallel primary crushers are joined together and fed into the X-ray sorting machine . The waste tire shredding and processing device according to claim 1, characterized in that the two-shaft drive cutter has a stack of disks with multiple disk blades on each drive shaft, and the disk blades are arranged in a spiral shape along the axial direction.

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