JP4097068B2 - Magnetic sorting device and sorting system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is included in agricultural products, marine products, processed foods (croutons, egg flakes, meat cubes, etc.), and fine and minute things such as pelletized plastic, or powders such as konjac flour and rice flour. The present invention relates to a magnetic separator that can separate foreign matter such as weak magnetic material and ferromagnetic material by using magnetic force.
[0002]
In addition, the present invention applies the above-described magnetic force sorting apparatus, and in addition to weak magnetic materials and ferromagnetic materials, nonmagnetic metals (nonferrous metals) such as aluminum and copper, hair, vinyl pieces, string pieces, etc. The present invention relates to a sorting system that can remove light foreign matter.
[0003]
[Prior art]
Conventionally, as a magnetic separator, for example, a permanent magnet type roll separator described in JP-A-4-74546 has been known.
This permanent magnet roll separator is a conveyor belt for conveying resin pellets, a drive roll and a permanent magnet roll around which the conveyor belt is wound, and a separation provided near the lower end where the conveyor belt is separated from the permanent magnet roll. And a scraper.
[0004]
In the permanent magnet type roll separator having such a configuration, the resin pellets supplied onto the transport belt spread on the transport belt and reach the position of the permanent magnet roll. Here, the conveyor belt starts circular motion along the permanent magnet roll. As a result, downward acceleration due to gravity is added to the conveying speed of the resin pellet, and the resin pellet starts dropping while changing the speed. At this time, since the pellets with no magnetic metal pieces mixed therein are not attracted by the magnetic force of the permanent magnet roll, they fall away from the conveyor belt. On the other hand, the pellet mixed with the magnetic metal piece moves to the separating scraper while being attached to the conveying belt by the magnetic force of the permanent magnet roll, and is scraped off and dropped.
[0005]
As a result, pellets that are not mixed with magnetic metal pieces can be stored in non-defective products, and pellets that are mixed can be stored in defective product receivers.
[0006]
[Problems to be solved by the invention]
By the way, since said permanent magnet type roll separator uses a conveyance belt, it is necessary to adjust the meandering and tension of the belt.
In addition, the above permanent magnet type roll separator is designed to scrape off pellets mixed with magnetic metal pieces adhering to the conveyor belt with a separating scraper, so that the conveyor belt is easily worn and a relatively short time is required. There is an inconvenience that it is necessary to replace it.
[0007]
Furthermore, since the above permanent magnet roll separator uses a transport belt, for example, when the selected material is powder, the selected material is likely to adhere to the surface of the transport belt.
For this reason, in the above-mentioned permanent magnet type roll separator, it is necessary to periodically stop the operation of the conveyor belt at a relatively short period and check the condition of the conveyor belt. There is a disadvantage that it is not suitable for continuous operation.
[0008]
In the above permanent magnet type roll separator, the conveyor belt and the like are cleaned during the periodic inspection. There is an inconvenience that the environment gets worse.
Further, since the permanent magnet type roll separator is a belt type, there is a problem that the belt portion cannot be cleaned with water or hot water.
[0009]
  Therefore, the present inventionEyesIn view of the above points, it is possible to operate continuously over a long period of time, facilitate the cleaning work performed during periodic inspections, and remove foreign substances contained in various substances such as agricultural products, marine products, and other industrial materials. Magnetic sorting device suitable for sortingIn addition to weak magnetic materials and ferromagnetic materials, foreign materials such as aluminum and copper can be removedTo provide a sorting system.
[0010]
  In order to solve the above problems and achieve the object of the present invention, claims 1 to 1 are provided.4Each invention described in the above was configured as follows.
  That is, the invention described in claim 1 is a rotatable hollow rotating cylinder that receives a selected form of food or a predetermined form of plastic on the surface, and is disposed in a hollow portion of the rotating cylinder and is entirely circular. A first permanent material that is a magnetic substance contained in the sorted material, and the first sorted material by the rotation of the rotating cylinder and the magnetic force of the permanent magnet. A magnetic separation device that separates into a second sorting product other than the product, and a non-magnetic metal that is disposed downstream of the magnetic sorting device and is separated by the magnetic sorting device. And a metal detectorThe permanent magnet is composed of a plurality of ring-shaped permanent magnets, and the plurality of ring-shaped permanent magnets are arranged in series so that adjacent magnetic poles are the same, and soft iron is interposed between the plurality of ring-shaped permanent magnets. A yoke made of steel is interposed.
[0011]
  According to a second aspect of the present invention, in the sorting system according to the first aspect, on the downstream side of the metal detector, when the metal detector detects the non-magnetic metal, the second selected item. A nonmagnetic metal separator for separating the nonmagnetic metal from the inside is further provided.
  According to a third aspect of the present invention, in the sorting system according to the first or second aspect, a wind power sorting device for sorting the sorted matter by wind power is further provided upstream of the magnetic force sorting device. .
[0012]
  Claim4The invention described in claim 1 to claim 13In the sorting system according to any one of the above, the predetermined form of food is dried food, grain, or cerealThingIt is a powder, and the plastic in the predetermined form is in the form of pellets, beads, or powder.
[0013]
  According to such a sorting system of the present invention, a magnetic substance contained in a predetermined form of food or a predetermined form of plastic can be removed by the magnetic separator, and the magnetic substance is removed from the sorted object by the metal detector. The nonmagnetic metal contained can be detected, or the nonmagnetic metal contained in the sorted product from which the magnetic substance has been removed can be detected and removed by the metal detector and the nonmagnetic metal separation device.
Further, in the sorting system of the present invention, when the wind sorting apparatus is provided, foreign matter such as weak magnetic substances mixed in the sorted matter after the sorting can be separated even if the sorted matter requires the wind sorting. For this reason, the object of sorting can be expanded, and a sorting system with added value can be provided.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
A schematic configuration of an embodiment of the magnetic separator according to the present invention will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1, the magnetic separator according to this embodiment includes a hopper 1, a fixed amount supply mechanism 4 including a pair of fixed amount supply rollers 2 and 3, a rotating cylinder 5, a permanent magnet 6, and a separation adjusting plate 7. And at least a fall prevention plate 8, and each component other than the hopper 1 is arranged in the sorting case 9.
[0020]
Below the sorting case 9, a non-defective chute 10 that guides a non-defective product selected by the rotating cylinder 5 and the permanent magnet 6 to a non-defective product receiver (not shown), and a sorted defective product receiver (not shown). A defective product chute 11 is connected to each other.
More specifically, the hopper 1 accommodates a sorting object mixed with at least a foreign substance of a fine or minute weak magnetic material, and its quantitative supply rollers 2, 3, whose discharge port is disposed below the hopper 1. It faces the gap. In addition, the selection object used as the object of selection in this embodiment is mentioned later.
[0021]
The fixed amount supply mechanism 4 is composed of a pair of rotatable fixed amount supply rollers 2 and 3, and when receiving a sorted product discharged from the discharge port of the hopper 1, the received sorted product is placed on the upper surface side of the rotary cylinder 5. In the length direction, it is supplied continuously in fixed amounts.
The rotating cylinder 5 receives and conveys a sorting object mixed with foreign substances on its upper surface, and is configured by a thin (for example, 1 mm or less) hollow cylindrical body. The rotating cylinder 5 is entirely composed of a metal that is not easily worn, such as stainless steel, and can be rotated at a predetermined speed by a motor as will be described later. Further, by controlling the rotation of the motor, the number of rotations of the rotating cylinder 5 can be controlled, and the conveyance amount per unit time of the selected item can be controlled by the control.
[0022]
The permanent magnet 6 is formed in a substantially cylindrical shape as a whole. The permanent magnet 6 is disposed so as to be rotatable in the longitudinal direction of the rotating cylinder 5 on the upper side in the hollow portion of the rotating cylinder 5 and on the side where the sorted matter on the rotating cylinder 5 is discharged. A predetermined magnetic field is generated in the direction. The permanent magnet 6 applies a magnetic force to the selected item when the selected item on the upper surface of the rotary cylinder 5 is discharged.
[0023]
Here, as will be described later, the permanent magnet 6 can move in a direction intersecting the length direction of the rotating cylinder 5 (specifically, the X direction and the Y direction in FIG. 1) in the rotating cylinder 5, After the movement, it can be positioned at a predetermined position.
Moreover, although the opening part of the both ends of the rotation cylinder 5 is open in FIG.1 and FIG.2, in fact, it is plugged except the part which the axis | shaft of the permanent magnet 6 penetrates, The surface of the rotation cylinder 5 An airtight structure is employed, such as providing a seal so that water does not enter the rotating cylinder 5 even if it is washed with water or warm water.
[0024]
The separation adjusting plate 7 guides the foreign matter to the defective product chute 11 side when the sorted material conveyed on the rotary cylinder 5 is discharged and sorted into the foreign matter and the foreign matter, and the non-foreign matter is non-defective. It is for guiding to the chute 10 side. The separation adjusting plate 7 can adjust the arrangement angle according to the release state of the selected item depending on the weight of the selected item and the rotation speed of the rotary cylinder 5. That is, the separation adjusting plate 7 can be rotated (swinged) about the shaft 12 to adjust the arrangement angle, and after the adjustment, the separation adjusting plate 7 can be fixed at the arrangement angle. The separation adjusting plate 17 can be moved in the same direction by moving the shaft 12 in a direction (X direction) perpendicular to the length direction of the rotary cylinder 5 and can be fixed after the movement. .
[0025]
The fall prevention plate 8 temporarily stores the sorted product supplied from the fixed supply mechanism 4 onto the rotary cylinder 5, and prevents the sorted product from dropping in the direction opposite to the rotation direction of the rotary cylinder 5 at that time. It has become.
The sorting case 9 is preferably provided with a transparent window (not shown) at a part thereof so that the inside can be observed during the operation. Further, the sorting case 9 is in a sealed state during its operation, but at the time of inspection work or cleaning work, the part where the work is necessary can be easily removed so that the work becomes easy. ing.
[0026]
Next, the operation of the embodiment of the magnetic force sorting apparatus having such a configuration will be described with reference to FIGS. 1 and 2.
Sorted items to be selected in this embodiment include dried vegetables such as sesame seeds, grains such as rice and flour, dried seafood such as small cut wakame, pepper, konjac flour, wheat flour, salt, rice flour, etc. Powdered materials, pellets, beads, or powdered plastics, etc. As foreign materials to be sorted (separated) in the sorted products, ferromagnetic materials such as fine iron, fragments of stainless steel (such as SUS304) ) Or a nonmagnetic metal such as fine aluminum or copper may be mixed in or kneaded.
[0027]
Examples of the weak magnetic material include pebbles and mud containing iron oxide, insect feces, and mouse feces in addition to the above-mentioned stainless steel fragments.
Furthermore, in addition to the case where foreign substances such as those mentioned above are mixed in the above-mentioned selected items, there are cases where the above foreign substances adhere to non-defective products that are not foreign matters. In the embodiment, the object to which the foreign matter adheres can be separated and becomes a target for selection.
[0028]
Now, assuming that such a sort is accommodated in the hopper 1, the sort is discharged from the discharge port of the hopper 1 by its own weight and falls onto the quantitative supply rollers 2 and 3.
The selected items are continuously supplied by the fixed amount supply rollers 2 and 3 in a fixed amount in the length direction of the rotary tube 5 on the upper surface side (surface side) of the rotary tube 5. The supplied sorted material is temporarily stored on the upper surface of the rotating cylinder 5, but the rotating cylinder 5 rotates clockwise at a predetermined speed as shown in FIG. For this reason, the sorted product is conveyed toward the discharge side by the rotation of the rotating cylinder 5.
[0029]
When the selected item reaches the discharge end, the selected item is thrown out of the rotating cylinder 5 at the conveyance speed, and downward acceleration due to gravity is added to the conveyance speed, so that the selected item falls while changing the speed.
At this time, for example, when the selected item is a non-magnetic material and is a non-defective product, the non-defective product is rotated by the permanent magnet 6 that is rotating in the same direction as the rotating tube 5 when discharged from the rotating tube 5. Magnetic force does not work. For this reason, since the non-defective product is discharged to a position far away from the rotary cylinder 5, it passes through the non-defective chute 10 and is stored in a non-defective product receiver (not shown).
[0030]
On the other hand, when the selected material is a magnetic material such as a weak magnetic material or a ferromagnetic material (defective product), the foreign matter is released in the same direction as the rotating cylinder 5 when released from the rotating cylinder 5. A rotating magnetic force acts on the rotating permanent magnet 6. For this reason, the foreign matter cannot be moved far away from the rotary cylinder 5 when being released, and is attracted and stored in a defective product receptacle (not shown) through the defective product chute 11.
[0031]
Here, when the foreign matter is a weak magnetic material such as a broken piece of stainless steel, pebbles or mud containing iron oxide, insect dung, mouse dung, etc., there is no possibility of adhering to the rotating cylinder 5. Further, in the case of a ferromagnetic material such as an iron piece or iron powder, the gap between the rotating cylinder 5 and the permanent magnet 6 gradually increases, so that the magnetic force gradually decreases and does not remain attracted to the rotating cylinder 5. Fall.
[0032]
The permanent magnet 6 is not necessarily rotated, but is preferably rotated as described above.
Further, the position of the permanent magnet 6 is adjusted by an adjusting mechanism described later in order to perform optimum sorting according to the type of the sorting object and the rotation speed of the rotary cylinder 5.
Next, a specific configuration of the magnetic separator according to this embodiment will be described with reference to FIG.
[0033]
The hopper 1 is fixed to the slide frame 16 by appropriate means. The slide frame 16 can be moved (slid) in the left-right direction (X direction) in FIG. 3 with respect to the main frame 15. Thereby, the selected item from the hopper 1 can be supplied to an arbitrary position on the rotary cylinder 5.
The fixed amount supply rollers 2 and 3 are rotatably fixed to the slide frame 16. In addition, the fixed supply rollers 2 and 3 are either perpendicular to the length direction of the fixed supply rollers 2 or 3 so that the gap between the fixed supply rollers 2 and 3 can be adjusted in order to adjust the supply amount of the selected items. It includes a mechanism (not shown) that can move in the direction and can be positioned after the movement.
[0034]
As shown in FIG. 3, the right and left sides of the rotating cylinder 5 are supported by rotating cylinder receiving rollers 21 and 22, and are rotatable on the rotating cylinder receiving rollers 21 and 22. The rotary cylinder receiving rollers 21 and 22 are rotatably fixed at predetermined positions using the main frame 41.
In order to rotate the rotating cylinder 5, belt wheels 23 and 24 and a belt tension unit 25 are respectively arranged at predetermined positions below the end of the rotating cylinder 5 in the length direction. The belt 26 is stretched over the belt tension units 25, 24 and the belt tension unit 25.
[0035]
The belt wheel 23 is rotatably fixed to one end of a rotating shaft 27 to be supported. A belt wheel 28 is fixed to the other end of the rotary shaft 27, and the rotational force of the motor 30 is transmitted to the belt wheel 28 via a belt 29.
Therefore, according to such a configuration, the rotational force of the motor 30 can be transmitted to the rotary cylinder 5 via the belt 29, the belt 26, etc., and the rotary cylinder 5 can be rotated in a predetermined direction at a predetermined speed.
[0036]
Here, when a specific configuration example of the rotating cylinder 5 is given, it is configured in a cylindrical shape with stainless steel (for example, SUS304) having a thickness of 1 mm or less, and the diameter thereof is the same as the diameter of the permanent magnet 6 described later. For example, it is about 250 [mm].
The permanent magnet 6 has a shaft 61, and both ends of the shaft 61 are rotatably supported by bearings (not shown) provided on the lifting frame 18. A belt wheel 41 is fixed to one end of the shaft 61, and this belt wheel 41 is connected via a belt 43 to a belt wheel 42 fixed to a rotating shaft of a motor (not shown) provided on the lifting frame 18. ing.
[0037]
The elevating frame 18 is attached to the slide frame 17 so as to be movable up and down, that is, the elevating frame 17 is attached to the slide frame 17 so as to be movable in the vertical direction (Y direction) in FIG. The slide frame 17 is attached to the main frame 15 so as to slide in the left-right direction with respect to the main frame 15. That is, the slide frame 17 is attached to the main frame 15 so as to be movable in the left-right direction (X direction) in FIG.
[0038]
According to such a configuration, the permanent magnet 6 can be rotated at a predetermined speed in a predetermined direction by the motor in the hollow portion of the rotating cylinder 5, and in a direction orthogonal to the length direction of the rotating cylinder 5 in the hollow portion. It can move and can be positioned after that movement.
The separation adjusting plate 7 is separated into an upper side and a lower side, both of which can rotate (rotate) around the shaft 12, and the shaft 12 is guided by the guide groove 31. 3 can be moved in the X direction in FIG.
[0039]
Next, a specific configuration of the permanent magnet 6 will be described with reference to FIGS. 4 and 5.
As shown in FIG. 4, the permanent magnet 6 includes a rotating shaft 61, a plurality of ring-shaped permanent magnets 62, a plurality of soft iron yokes 63, fixing members 64 and 65, and a tightening nut 66.
[0040]
  As shown in FIG. 5, the ring-shaped permanent magnet 62 has one end face magnetized to the N pole and the other end face magnetized to the S pole, and the hole portion is inserted into the rotating shaft 61. ing. Further, the soft iron yoke 63 is formed in a ring shape like the ring-shaped permanent magnet 62, and the hole portion is inserted into the rotating shaft 61.
  In this permanent magnet 6, as shown in FIG. 4, ring-shaped permanent magnets 62 and soft iron yokes 63 are alternately placed with respect to the rotating shaft 61.Adjacent magnetic poles are the same through soft iron yoke 63A plurality are arranged in series so as to be (see FIG. 5). Then, both ends of the soft iron yoke 63 at both ends are fixed by the fixing members 64 and 65, and at the same time, the fixing member 64 is fixed by the tightening nut 66, whereby the plurality of ring-shaped permanent magnets 62 and the soft iron yoke 63 are mutually connected. The rotating shaft 61 is fixed in contact with the rotating shaft 61.
[0041]
Here, the specific size of the permanent magnet 6 having such a configuration has a diameter of 150 mm or more and a length of about 300 mm to 1000 mm. Moreover, the magnetic force of the surface is 14,000 gauss or more.
Thus, the permanent magnet 6 is composed of a plurality of ring-shaped permanent magnets 62, and the plurality of magnets 62 are arranged in series so that adjacent magnetic poles are reversed. Therefore, the magnetic field lines (magnetic fields) of the ring-shaped permanent magnets 62 are as shown in FIG. Therefore, the magnetic force on the surface in the length direction of the permanent magnet 6 can be made uniform.
[0042]
Next, an embodiment of the sorting system of the present invention to which the magnetic sorting apparatus of the embodiment of the present invention is applied will be described with reference to FIG.
In the magnetic separator using the magnetic force as shown in FIG. 1, foreign substances such as magnetic substances mixed in the selection can be separated, but light foreign substances such as hair, vinyl pieces, string pieces other than magnetic substances, Alternatively, foreign substances such as non-magnetic metals cannot be separated, and the sizes of the selected items cannot be made uniform.
[0043]
Therefore, in order to eliminate such inconvenience, as shown in FIG. 6, a magnetic force sorting device 71 using a magnetic force as shown in FIG. 1, and a shape sorting device 72 and a wind force sorting device 73 provided on the upstream side thereof. And a metal detector 110 and a non-magnetic metal separation device 120 provided on the downstream side of the magnetic separation device 71 are combined to expand a selection object, thereby constituting a selection system capable of expanding applications.
[0044]
This sorting system is suitable for dried foods containing foreign matters such as metals, stones and mud, dried foods such as dried hijiki and sesame.
The shape sorter 72 sorts out the appropriate size of the dried food, and as shown in FIG. 6, the shape sorter 72 has a two-stage upper and lower structure in a casing 81 that can be vibrated. It is comprised with the vibration feeder which provided the metal-mesh member 83,84.
[0045]
The casing 81 is provided with a supply port 82 for supplying dried food as described above, and the dried food supplied from the supply port 82 is vibrated on the upper metal mesh member 83 by vibration from the right side to the left side in FIG. It is going to progress. Further, the dried food dropped from the wire mesh member 83 onto the wire mesh member 84 advances in the same direction as described above due to vibration. Further, the dried food powder that has fallen from the wire mesh member 83 to the bottom of the casing 81 proceeds in the same direction by vibration.
[0046]
On the discharge side of the upper wire mesh member 83, a discharge port 85 for discharging a large-sized one is provided. On the discharge side of the lower wire mesh member 84, a discharge port 86 for discharging a small one is provided. Near the center of the housing 81, a discharge port 87 is provided extending from the wire mesh member 84 to the housing 81 and to the outside.
The mesh size of the metal mesh member 83 is set to a size that allows a dry food having a predetermined size or less, that is, a dry food having an appropriate size and a size smaller than that to pass, and a dry food larger than that to pass. Further, the mesh size of the wire mesh member 84 allows passage of dried food powder or the like smaller than the appropriate size of dried food, and prevents passage of the appropriate size of dried food.
[0047]
According to the shape sorting device 72 having such a configuration, when dry food is supplied from the supply port 82, dry food of an appropriate size can be discharged from the discharge port 87. It can be discharged from the discharge port 85, and dried food powder or the like can be discharged from the discharge port 86.
As shown in FIG. 6, the wind power sorter 73 uses the difference in the weight of the dried food to wind the dried food that has been sorted into an appropriate shape by wind power and the hair and vinyl strings contained therein. To separate.
[0048]
The wind sorting apparatus 73 includes a housing 91 having an inlet 94 at the top and an outlet 95 at the bottom. Further, the inside of the housing 91 is partitioned by a partition plate 92 extending from the top to the bottom, and the inside of the housing 91 has a dried food dropping passage 96 communicating with the inlet 94 and a lower side communicating with the dried food dropping passage 96. The discharge passage 97 is formed.
[0049]
The outlet 95 communicates with the dried food dropping passage 96 and the discharge passage 97. A plurality of air nozzles 93 for discharging air are disposed on the end side of the dried food dropping passage 96 in the casing 91 with the outlets facing the start end side of the discharge passage 97. The plurality of air nozzles 93 are connected to an air supply source (not shown). The end side of the discharge passage 97 is connected to the dust collector 100 via a duct 98.
[0050]
According to the wind power sorting device 73 having such a configuration, the dried food of an appropriate size sorted by the shape sorting device 72 falls through the dried food dropping passage 96, but blows out from the air nozzle 93 when reaching the end side. Wind power by air is given. For this reason, hair, vinyl string pieces, and the like that are contained in an appropriately sized dry food and are lighter than that move to the start end side of the discharge passage 97 by the wind force, and are therefore sucked into the dust collector 100. On the other hand, an appropriately sized dried food or the like falls due to its own weight and is collected in the hopper 1 of the magnetic separator 71 because the action of wind force is weak.
[0051]
The metal detector 110 is installed below the non-defective product chute 10 and detects a non-magnetic metal contained in a sorted product (non-defective product) from which the magnetic material has been removed by the magnetic sorting device 71.
The metal detector 110 has a through passage 111 through which a selection object falling in the approximate center of the head can pass, and the through passage 111 oscillates to generate an electromagnetic field as shown in FIG. There are provided a coil for reception TX, and reception coils TX1 and TX2 that are arranged at a predetermined distance on both sides of the oscillation coil TX and excite voltage by an electromagnetic field generated by the oscillation coil TX. Further, a stainless steel ring 112 for controlling leakage of an electromagnetic field from the oscillation coil TX is attached to the entrance of the through passage 111.
[0052]
The metal detector 110 configured as described above has an output voltage of the reception coil RX1 and a reception coil RX2 when the selected material passing through the through passage 111 includes a non-ferrous metal and a non-ferrous metal. The fact that the potential difference from the output voltage is different is utilized.
That is, when the sorting object including the non-ferrous metal passes through the through passage 111 of the metal detector 110, the difference between the output potentials of the receiving coils RX1 and RX2 exceeds the + threshold value and the −threshold value. A detection signal indicating that a metallic metal is contained is output to a control device (not shown).
[0053]
On the other hand, when a sorting object that does not contain non-ferrous metal passes through the through passage 111, the difference between the output potentials of the receiving coils RX1 and RX2 does not exceed the + threshold value and the −threshold value. A detection signal indicating that the metal is included is not output.
The nonmagnetic metal separation device 120 separates the sorted product (non-defective product) from which the magnetic material has been removed by the magnetic sorting device 71 into a defective product containing a nonmagnetic metal and a good product not containing a nonmagnetic metal.
[0054]
The nonmagnetic metal separation device 120 includes a separation plate 121 that can swing inside, and a non-defective discharge passage 124 that is located at a lower position corresponding to the through passage 111 of the metal detector 110 with the separation plate 121 interposed therebetween, And a defective product discharge section 122 located on the opposite side. A defective product receiver 123 is disposed below the defective product discharge section 122, and a non-defective product receiver 125 is disposed below the non-defective product discharge section 124.
[0055]
In the nonmagnetic metal separation device 120 configured as described above, when a control device (not shown) receives a nonferrous metal detection signal from the metal detector 110, the control device moves the separation plate 121 in the direction of the broken line in FIG. The defective product containing the non-ferrous metal is accumulated in the defective product receiver 123 via the defective product discharge unit 122.
On the other hand, when the control device does not receive the non-ferrous metal detection signal from the metal detector 110, the control device maintains the separation plate 121 at the position of the solid line in FIG. Through the non-defective product receiver 125.
[0056]
Here, as described above, since the magnetic material including the weak magnetic material is removed by the magnetic force sorting device 71, the output potential difference between the receiving coils RX1 and RX2 in the metal detector 110 becomes small. For this reason, the threshold value for discriminating between a defective product containing a nonmagnetic metal and a non-defective product containing no nonmagnetic metal can be set low.
Therefore, the sensitivity of the metal detector 110 can be increased, and a small object can be detected as compared with the case where the metal detector 110 is used alone. In particular, the detection sensitivity of nonferrous metals is improved.
[0057]
That is, smaller foreign substances can be removed by combining the magnetic sorting device 71 or the metal detector 110 than when using the magnetic sorting device 71 alone.
[0058]
【The invention's effect】
  As mentioned aboveThe bookAccording to the sorting system of the invention,The magnetic substance contained in a predetermined form of food or plastic of a predetermined form can be removed with a magnetic separator, and the nonmagnetic metal contained in the sorted object from which the magnetic substance has been removed can be detected with a metal detector. Alternatively, it is possible to detect and remove the nonmagnetic metal contained in the sorted product from which the magnetic material has been removed by the metal detector and the nonmagnetic metal separator.
Further, in the sorting system of the present invention, when the wind sorting apparatus is provided, foreign matter such as weak magnetic substances mixed in the sorted matter after the sorting can be separated even if the sorted matter requires the wind sorting. For this reason, the object of sorting can be expanded, and a sorting system with added value can be provided.
[Brief description of the drawings]
FIG. 1 is a side view showing a schematic configuration of an embodiment of a magnetic separator according to the present invention.
FIG. 2 is a perspective view showing a schematic configuration of the embodiment.
FIG. 3 is a side view showing a detailed configuration of the embodiment.
FIG. 4 is a side view showing an example of a permanent magnet.
FIG. 5 is a perspective view for explaining the arrangement of ring-shaped permanent magnets and the direction of the magnetic field thereof.
FIG. 6 is a side view showing an embodiment of the sorting system of the present invention.
FIG. 7 is a schematic configuration diagram of an oscillating coil and a receiving coil arranged in a through path of a metal detector.
[Explanation of symbols]
1 Hopper
A few fixed supply rollers
4. Fixed quantity supply mechanism (quantitative supply means)
5 Rotating cylinder
6 Permanent magnet
7 Separation adjustment plate
8 Fall prevention plate
9 Case for sorting
16, 17 slide frame
18 Lifting frame
62 Ring-shaped permanent magnet
63 Soft iron yoke
71 Magnetic separator
72 Shape sorter
73 Wind sorter
110 Metal detector
120 Non-magnetic metal separator

Claims (4)

A rotating hollow rotating cylinder that receives a food made of a predetermined form of food or a predetermined form of plastic on the surface thereof, and a cylindrical permanent magnet that is disposed in the hollow portion of the rotating cylinder and is entirely in the rotation. The selected item is separated into a first selected item, which is a magnetic substance contained in the selected item, and a second selected item other than the first selected item by the rotation of the cylinder and the magnetic force of the permanent magnet. A magnetic separator to perform,
A metal detector that is disposed downstream of the magnetic separator and detects a non-magnetic metal contained in a second selection separated by the magnetic separator ,
The permanent magnet is composed of a plurality of ring-shaped permanent magnets, the plurality of ring-shaped permanent magnets are arranged in series so that adjacent magnetic poles are the same, and made of soft iron between the plurality of ring-shaped permanent magnets A sorting system characterized by interposing a yoke .   On the downstream side of the metal detector, when the metal detector detects the nonmagnetic metal, a nonmagnetic metal separation device is further provided for separating the nonmagnetic metal from the second selection. The sorting system according to claim 1, wherein:   The sorting system according to claim 1, further comprising a wind power sorting device that sorts the sorted matter by wind power upstream of the magnetic sorting device. The predetermined form of food is a dried food, a grain, or a powder of cereal, and the predetermined form of plastic is in the form of pellets, beads, or powders. 4. The sorting system according to any one of 3 .

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