JP6502155B2 - Sorting device - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a sorting apparatus for separating sorted matter contaminated or adhered with metal.

  For example, there is known a sorting apparatus for detecting and sorting impurities contained in food ingredients in the process of producing food ingredients such as powdered or granular instant food and seasonings. Among the impurities, a metal detector for sorting metal impurities generally has a transmitting coil for generating an electromagnetic field and a receiving coil for exciting a voltage by an electromagnetic wave generated from the transmitting coil. The metal detector determines the mixing of metal impurities by detecting the output voltage difference of the receiving coil.

  A sorting apparatus having a metal detector usually uses a method of sorting while transporting products from the viewpoint of improving the production efficiency of the products. For example, the sorting apparatus disclosed in Patent Document 1 is known. Patent Document 1 discloses a metal detector having a tubular penetrating portion that detects metal inside. The penetrating portion has an opening in the vertical direction, and allows the object to be separated to pass by gravity.

  Objects to be detected, such as food materials, need to pass through other detectors besides metal detectors or be transported from various manufacturing processes, so movement in the horizontal direction (horizontal direction) from the viewpoint of production efficiency A sorting device is known that is configured to gravity down and pass through the cylindrical penetration of the metal detector. For example, the sorting apparatus of Patent Document 2 includes a magnetic substance removing machine having a cylindrical rotary cylinder in which a magnet is disposed inside on the upstream side of a metal detector. Since the detection subject passes through the upper circumferential surface of the rotating cylinder while rotating, the detection subject falls by gravity while following lateral movement in the next step by the centrifugal force, and the cylindrical penetration portion of the metal detector is It is configured to pass.

JP, 2006-334559, A JP 2005-342651 A

  However, in the sorting apparatus configured such that the object to be detected falls by gravity while moving in the lateral direction and passes through the cylindrical penetrating portion of the metal detector, the metal in the object to be detected is erroneously detected was there. As a result, there is a problem that the non-defective product is selected as a non-defective product and the production efficiency may be reduced.

  An object of the present invention is to provide a sorting device capable of reducing false detection of a metal detector.

  According to the present invention, it has been found that the antistatic layer on the inner surface of the through-passage of the metal detector peels off due to the continuous contact of the object to be detected which is falling by gravity, so that static electricity is generated and false detection of the metal detector occurs. It is based on things.

  In order to achieve the above object, according to one aspect of the present invention, a moving means accompanied by horizontal movement, and a penetrating means provided vertically downstream of the moving means, which is the object to which the metal has been mixed or attached is moved horizontally. And a metal detector having a cylindrical through-passage having an antistatic layer formed on the inner surface, and a separator provided downstream of the metal detector and separating metal-containing and metal-free objects In the sorting device having a metal separation device, the material to be sorted is configured to fall by gravity while moving from the downstream side end of the moving means in the horizontal direction, and the gravity falling trajectory of the material to be sorted is There is provided a sorting device characterized in that a straightening vane for changing the gravity drop trajectory is provided on the upstream side of the through passage at a position not in contact with the inner surface of the through passage.

  The moving means is a conveying means for conveying the object in the horizontal direction, a magnetic substance removing machine having a cylindrical rotating body for removing the magnetic metal on the circumferential surface while rotating in the conveying direction, or a combination thereof May be. The material to be sorted may be a powder or granular food. The magnetic substance removing machine is configured to dispose a first magnet inside the rotary cylinder, receive the magnetic substance on the surface of the rotary cylinder, and discharge the sorted matter including the magnetic substance to the defective product passage. A second magnet removable from the outside may be disposed inside the defective product passage.

  According to the present invention, false detection of a metal detector can be reduced.

FIG. 1 is a side view showing a schematic configuration of a sorting apparatus of the present embodiment. AA sectional drawing in the discharge pipe of the sorting device of this embodiment. (A)-(c) Sectional drawing of the baffle plate as another example.

An embodiment of a sorting apparatus embodying the present invention will be described below with reference to FIGS.
As shown in FIG. 1, the conveyance belt 11 as a conveyance means of the sorting apparatus 10 is an endless belt, and is wound around drive rolls 12 and 13 disposed in a pair on the upstream and downstream sides in the conveyance direction. . The drive rolls 12 and 13 are rotatably attached to the main body of the sorting device 10 (not shown). The hopper 14 is fixed to the main body of the sorting apparatus 10 at the upper side on the upstream side in the transport direction of the transport belt 11, and the amount of the object to which the metal is mixed or attached at the lower end of the hopper 14 is discharged onto the transport belt 11. A discharge port 15 is provided which discharges while adjusting the pressure. The downstream side of the transport belt 11 in the transport direction is the front side of the sorting device 10, and the upstream side is the rear side. When the sorting device 10 is viewed from the front side, the two side directions are referred to as the left-right direction of the sorting device 10.

  Below the drive roll 13 provided on the downstream side in the transport direction, a magnetic substance remover 16 fixed to the main body of the sorting device 10 is disposed. The magnetic substance removing device 16 constitutes a moving means accompanied by the movement of the object to be sorted in the horizontal direction (X-axis direction) together with the transport belt 11. The magnetic substance removing device 16 has an axial direction in the longitudinal direction of the sorting device 10 and rotates in the transport direction, and detects a magnetic metal substance on the circumferential surface while rotating in the transport direction; A bamboo split semi-arc-shaped permanent magnet 16b is provided inside as a first magnet. The central axis of rotation of the rotary cylinder 16 a is disposed in the left and right longitudinal direction of the sorting device 10 which is orthogonal to the transport direction. The permanent magnet 16b is disposed on the front side of the sorting device 10, that is, on the conveyance side of the objects to be sorted of the rotary cylinder 16a, along the inner circumferential surface of the rotary cylinder 16a from near the upper end to near the lower end of the rotary cylinder 16a. The magnetic substance remover 16 sorts the magnetic substance among the metals mixed as impurities in the object to be sorted. The magnetic substance is not particularly limited, and examples thereof include iron, stainless steel, cobalt, nickel, iron oxide and the like. An attached material separation scraper 17 is attached via the main body of the sorting device 10 on the non-detection side circumferential surface of the magnetic body of the rotary cylinder 16 a.

  In the lower front side of the magnetic substance removal machine 16, a nonmagnetic material passage 18 for dropping an object to be sorted made of nonmagnetic substances not containing magnetic substances, and in the lower lower side of the magnetic substance removal machine 16 Alternatively, a defective product passage 19 is provided for dropping the sorted matter contaminated or adhered with the magnetic substance.

  A flat magnetic material separation plate 21 extending in the left-right direction of the sorting device 10 is attached between the nonmagnetic material passage 18 and the defective product passage 19 via a support shaft 20. The support shaft 20 is rotatably provided at the boundary between the nonmagnetic material passage 18 and the defective product passage 19 and is connected to the lower end portion of the magnetic material separation plate 21. The magnetic substance separation plate 21 is attached so as to be pivotable within a range of a predetermined angle around the support shaft 20. A magnetic substance separated by the permanent magnet 16b or an object to which the magnetic substance is mixed or attached is separated from the magnetic substance separating plate 21 as an object to which the magnetic substance is not mixed or attached. The inclination angle of the magnetic substance separation plate 21 is appropriately adjusted in accordance with the type and size of the magnetic substance and the object to be sorted, the speed of the rotary cylinder 16a, and the like. After the angle adjustment, the magnetic substance separation plate 21 is configured to be fixed at the arrangement angle.

  The defective product passage 19 includes a tapered portion 19a whose diameter decreases downward from the left and right direction and the front and rear direction of the sorting device 10, and a cylindrical discharge pipe 19b which communicates with the tapered portion 19a and extends vertically downward. A defective product receiver 22 is attached to the lower end of the discharge pipe 19b. A plurality of rod-like second magnets 23 which can be taken out to the outside are disposed on the inner side of the discharge pipe 19b on the way to the defective product receiver 22.

  As shown in FIG. 2, three second magnets 23 are disposed in parallel on a plane perpendicular to the axis of the discharge pipe 19b at a predetermined interval. The second magnets 23 are configured to be removable to the outside by sliding them in the longitudinal direction of the second magnets 23, respectively.

  The nonmagnetic passage 18 extends vertically downward, and has a rectangular cross section in the horizontal direction. A chute-type metal detector 24 is attached to the lower end of the nonmagnetic passage 18. The metal detector 24 is configured of a through passage 24 a having a rectangular cylindrical cross section which penetrates in the vertical direction, and a metal detector main body 24 b into which the through passage 24 a is inserted. The through passage 24a is configured such that the inner diameter is substantially the same from the upper end to the lower end.

  The through passage 24a communicates with the lower end portion of the nonmagnetic passage 18 at the upper end portion, and allows the object to be dropped when it is used. An antistatic layer is formed on the inner circumferential surface of the through passage 24a. The antistatic layer can be formed by a known method such as application of an antistatic agent or lamination of an antistatic film. The antistatic agent is not particularly limited, and known ones such as cationic surfactants, quaternary ammonium ions, carbon-based powder materials and the like can be used. The antistatic layer may be made of a known conductive resin.

  A flat plate-like straightening plate 25 extending in the left and right longitudinal direction of the sorting device 10 is attached to the inner surface of the nonmagnetic passage 18 upstream of the through passage 24 a on the front side of the sorting device 10. The current plate 25 faces the contact surface 25a with which the objects to be sorted come in contact with the magnetic substance removing device 16 and is inclined obliquely downward, and the longitudinal direction of the current plate 25 is parallel to the longitudinal direction of the magnetic material removing machine 16 It is fixed to be. The gravity fall trajectory is changed to a position where the gravity fall trajectory of the object after removal of the magnetic material by the magnetic material removing device 16 is not in contact with the inner surface of the through passage 24 a by the rectifying plate 25. The gravity drop trajectory of the objects to be sorted refers to the central part of the thickness width before and after the horizontal movement direction when the powder or granular objects to be sorted which are conveyed with a predetermined thickness continuously fall, that is, back and forth The trajectory of the central part of the width of the vertical section in the direction is shown.

  The metal detector main body 24b is connected with an oscillating coil (not shown) for generating an electromagnetic field, a receiving coil for exciting a voltage by the electromagnetic field generated by the oscillating coil, and the oscillating coil and a receiving coil. A controller is provided. The metal detector 24 does not mix and adhere to the magnetic substance after passing through the magnetic substance remover 16, and the object to be sorted to which the nonmagnetic metal is mixed or adheres passes through the through passage 24 a. The nonmagnetic metal detection signal is sent to the control device when the output voltage difference of the receiving coil exceeds a predetermined threshold value. The nonmagnetic metal detected by the metal detector 24 is not particularly limited, and examples thereof include aluminum and copper. A stainless steel ring (not shown) for suppressing the leakage of the electromagnetic field from the oscillation coil is attached to the entrance of the through passage 24a. The metal detector 24 can send a detection signal to the control device even when the magnetic metal passes.

  At the lower end of the through passage 24a, nonmagnetic metal separation is performed to separate an object which has passed through the metal detector 24 into a defective item containing nonmagnetic metal and a good item containing no nonmagnetic metal. A device 26 is provided. The nonmagnetic metal separation device 26 includes a non-defective passage 27 communicating with the lower end portion of the through passage 24a and a nondefective passage 29 branched between the non-defective passage 27 and the through passage 24a via the nonmagnetic metal separation plate 28. It consists of

  The lower end portion of the nonmagnetic metal separation plate 28 is connected to a pivot 30 rotatably mounted at the boundary between the non-defective product passage 27 and the non-defective product passage 29. The nonmagnetic metal separation plate 28 closes the defective product passage 29 around the support shaft 30 to connect the through passage 24a with the good product passage 27, and closes the good product passage 27 to form the through passage 24a and the defective product passage 29. It is pivotally mounted between the position where it makes it communicate.

  The non-defective product passage 27 and the non-defective product passage 29 are each formed in a tapered shape which is reduced in diameter downward from the left and right direction of the sorting device 10. A defective product receiver 31 is attached to the lower end of the defective product passage 29.

A sorting method using the sorting apparatus 10 of the above embodiment will be described.
First, the object to be sorted, to which metal is mixed or attached, is continuously administered from the discharge port 15 of the hopper 14 to the upstream side of the rotating transport belt 11. The thickness of the objects to be sorted on the transport belt 11 is not particularly limited, and is appropriately set within a practical range from the viewpoint of the type or size of the objects to be sorted, the detection or removal of defective products, and the like. The objects to be sorted on the transport belt 11 are transported from the upstream side to the downstream end side in the transport direction while being moved in the horizontal direction. As shown in FIG. 1, next, the object to be sorted is moved from the end on the drive roll 13 side of the transport belt 11, that is, from the downstream end A of the transport belt 11, in the horizontal direction To the upper surface of the rotating cylinder 16a rotating.

  As shown in FIG. 1, the rotating cylinder 16 a is rotating at a predetermined speed in a direction in which the upper surface portion moves to the front side of the sorting device 10 (arrow Y direction). Therefore, the object to be sorted made of nonmagnetic material moves from the end (downstream end B) away from the surface of the rotary cylinder 16a by the centrifugal force of the rotary cylinder 16a in the horizontal direction according to the arrow X2. Gravity falls into the nonmagnetic passage 18 while

  The magnetic substance or the object to which the magnetic substance is mixed or attached adheres to the surface of the rotary cylinder 16a by the permanent magnet 16b, and is separated toward the defective product passage 19 behind the magnetic substance separation plate 21. The magnetic material moved to the defective product passage 19 or the separated object mixed or adhered with the magnetic material separates from the permanent magnet 16b with the rotational movement of the rotary cylinder 16a and falls from the surface of the rotary cylinder 16a to the defective product passage 19 Do. The sorted matter adhering on the surface of the rotary cylinder 16 a is peeled off by the adhered material separation scraper 17. The transport speed of the transport belt 11 and the speed on the circumferential surface of the rotary cylinder 16a (rotational speed of the rotary cylinder 16a) are not particularly limited, and are appropriately set according to the type, size, etc. of the objects to be sorted. It is preferably selected from the range of 10 cm / sec to 300 cm / sec from the viewpoint of detection / removal accuracy of impurities and manufacturing efficiency. After the magnetic material is adsorbed on the second magnet 23 inside the discharge pipe 19b, the residue dropped to the defective product passage 19 is accommodated in the defective product receiver 22 at the lower end of the discharge pipe 19b.

  An object to be sorted which has fallen by gravity into the nonmagnetic passage 18 while moving from the downstream end B of the rotary cylinder 16a in the horizontal direction according to the arrow X2 abuts on the contact surface 25a of the current plate 25. After that, the gravity fall trajectory changes, and it falls toward the inside of the through passage 24a and passes through the through passage 24a while following the gravity fall trajectory arrow X3.

  When the control object does not receive a detection signal of nonmagnetic metal in the object to be sorted when the object to be sorted passes through the passage 24a, the control device transmits the nonmagnetic metal separation plate 28 of the nonmagnetic metal separator 26 The nonmagnetic metal separation plate 28 maintains the position for closing the defective product passage 29 without outputting the nonmagnetic metal discharge command. Then, the sorted products of non-defective products containing no nonmagnetic metal fall into the non-defective product passage 27.

  On the other hand, when the control device of the metal detector 24 receives a detection signal of nonmagnetic metal, the control device outputs a nonmagnetic metal discharge command to the nonmagnetic metal separation plate 28 of the nonmagnetic metal separation device 26. The nonmagnetic metal separation plate 28 closes the non-defective passage 27 at the timing when the nonmagnetic metal passes based on the nonmagnetic metal discharge command, and swings in the direction to connect the defective product passage 29 and the through passage 24a. Let Defects sorted out of non-magnetic metal are collected in the defect receiver 31 by passing through the defect passage 29.

The operation of the sorting apparatus 10 of the above embodiment will be described.
In the sorting apparatus 10 of the above-described embodiment, the object to be sorted, whose gravity fall trajectory from the downstream end B of the rotary cylinder 16 a falls into the nonmagnetic passage 18 while moving in the horizontal direction, is the current plate 25. After coming into contact with the contact surface 25a, the gravity drop trajectory drops toward the inside of the through passage 24a in accordance with the arrow X3 and passes through the through passage 24a. For example, in the case where the gravity fall trajectory from the downstream end B of the rotary cylinder 16a falls horizontally into the through passage 24a with movement in the horizontal direction according to X2 without providing the rectifying plate 25, the gravity fall trajectory is X2 , The inner surface of the through passage 24a. In particular, when the objects to be sorted fall continuously, the antistatic layer formed on the inner surface of the through passage 24a may be peeled off. Since peeling of the antistatic layer generates static electricity on the inner surface of the through passage 24a, there is a possibility that the metal detector 24 may be erroneously detected.

  The contact surface 25a of the straightening vane 25 changes the gravity falling trajectory of the object to be sorted, and the continuous falling contact of the object to the inner surface of the through passage 24a can be avoided or reduced. As described above, the gravity falling trajectory of the object to be sorted refers to the center of the front-rear thickness width in the horizontal movement direction when the powder or granular object to be sorted which is conveyed with a predetermined thickness falls continuously. The trajectory of the central portion of the width of the vertical cross-section of the part, that is, the vertical direction of the falling object to be sorted. Therefore, in the present embodiment, it does not deny the presence of the object to be sorted that falls in contact with the inner surface of the through passage 24a by soaring or the like. Among the objects to be sorted which fall by gravity and pass through the through passage 24a, the ratio of the object not contacting the inner surface of the through passage 24a is preferably 70% by mass or more, more preferably 80% by mass or more, still more preferably 90%. It is mass% or more. As the ratio increases, peeling of the antistatic layer on the inner surface of the through passage 24a can be further prevented.

According to the sorting apparatus 10 of the present embodiment, the following effects can be obtained.
(1) In the sorting apparatus 10 of the present embodiment, the gravity fall trajectory of the objects to be sorted is changed by the flow straightening plate 25 to avoid or reduce the continuous falling contact of the objects to be sorted to the inner surface of the through passage 24a. . Therefore, it is possible to suppress peeling of the antistatic layer formed on the inner surface of the through passage 24a. Thus, false detection of the metal detector can be reduced.

  (2) The straightening vane 25 for changing the gravity drop trajectory of the object to be sorted is formed in a plate shape, and is attached to the inner surface of the nonmagnetic passage 18. Therefore, when the type or size of the object to be sorted or the rotational speed of the rotary cylinder 16a is changed, the inclination angle or mounting position of the straightening vane 25 can be easily changed, and the falling trajectory of the object to be sorted It can be easily adjusted. Further, since the flow control plate 25 has a plate-like shape, the falling speed of the object to be sorted is reduced or clogged at the upper end opening of the through passage 24a as compared with the configuration in which the diameter of the upper end opening of the through passage 24a is reduced. There is no risk of

  (3) In the present embodiment, the object dropped to the defective product passage 19 passes the second magnet 23 disposed inside the discharge pipe 19 b before being accommodated in the defective product receiver 22. Configured. Therefore, the magnetic substance can be easily found out. That is, it is not easy to take out only the magnetic substance from the mixture of all the objects to be sorted and the magnetic substance which are usually separated as defective products. Since the second magnet 23 disposed in the middle of the defective product passage 19 plays a role of secondary sorting, the magnetic substance attached to the second magnet 23 is taken out of the discharge pipe 19 b together with the second magnet 23. By this, it is possible to easily find out the magnetic substance.

The above embodiment may be modified as follows.
The straightening vane 25 may be mounted in the nonmagnetic passage 18 through changing means for changing the tilt angle or changing the mounting position in the vertical direction.

  The shape of the current plate 25 is not particularly limited as long as it is plate-like. As shown in FIGS. 3 (a) to 3 (c), for example, the vertical cross section in the longitudinal direction or the falling direction of the object to be sorted is a wave plate 32, a continuous mountain plate 33, a continuous bamboo split semi-arc The plate 34, or a combination thereof, or even a part thereof is included in the plate shape.

-Instead of the conveyance belt 11, a screw feeder, a vibration feeder, an air feeder, or the like may be used as a moving unit in the horizontal direction.
In the embodiment described above, the moving means may be configured of only one of the transport belt 11 and the magnetic substance remover 16 according to various purposes. In the case where the magnetic substance removing device 16 is omitted, the object to be sorted containing metal is a contact surface 25 a of the current plate 25 while the gravity dropping trajectory from the downstream end A of the transport belt 11 follows the arrow X 1. Fall into And the to-be-sorted thing passes so that a gravity descent | fall fall track | truck may not contact the inner surface of the through-passage 24a.

  -In the said embodiment, the structure of the conveyance belt 11 and the magnetic substance removal machine 16 was employ | adopted as a moving means to which the to-be-sorted thing which metal mixed or adhered adheres to a horizontal direction. Movement in the horizontal direction may include movement in the horizontal direction (X-axis direction), and may be inclined downward or upward.

-The kind of permanent magnet 16b which comprises the magnetic substance removal machine 16 is not specifically limited, You may be structures other than permanent magnets, such as an electromagnet.
The support shaft 20 itself supporting the magnetic substance separation plate 21 may be configured to be movable in the front-rear direction of the sorting device 10.

  The inner surface of the through passage 24a may be configured to expand in diameter as it goes downward so as not to be in contact with the gravity falling path of the object to be sorted. In addition, the through passage 24a may be inclined and attached so as not to contact with the gravity falling path of the object to be sorted.

  The material of the through passage 24a is not particularly limited as long as it is made of synthetic resin. Examples of the synthetic resin include polycarbonate, polyester, polyvinyl chloride, polyethylene and the like.

  In the above embodiment, in order to sort foreign matter having a size different from that of the object to be sorted, a shape sorter comprising a sieve of a predetermined mesh may be provided on the upstream side of the magnetic substance remover 16. In addition, a wind sorter may be provided to sort light foreign substances such as hair, vinyl pieces and the like. Further, an X-ray detector may be provided downstream of the non-defective passage of the metal detector 24 in order to detect and sort out nonmagnetic foreign matter.

  -The kind of to-be-sorted object to which the sorting apparatus 10 of the said embodiment is applied is not specifically limited. For example, there may be mentioned powdery or granular foods, medicines, cosmetics, chemical products, raw materials thereof, etc., each having a predetermined particle size. Examples of the food or its raw material include dried vegetables and seaweed, cereal flour such as corn, various seasonings, and raw materials of various instant foods.

  The form and size of the object to be sorted are not particularly limited, but it is preferable that a powdery or granular object to be sorted which is easily detected continuously by the metal detector 24 be applied. Specifically, if the average particle diameter measured by the sieving method is preferably in the range of about 50 μm to 5 cm, more preferably about 500 μm to 5 mm, it can be appropriately adopted. The powdery or granular form includes, for example, granulated granular form, pulverized one, pulverized one, and the like.

The sorting apparatus 10 according to the above-described embodiment may be used not only for the manufacturing process of various products but also for sorting metals from waste such as waste and industrial waste.
The arrangement position, the shape, or the number of the second magnets 23 are not particularly limited as long as the magnetic bodies passing through the defective product passage 19 can be attached. Magnets which can be taken out to the outside may be disposed at a plurality of locations on the defective product passage 19. In such a case, the magnetic body can be found out more reliably.

  In the above embodiment, the gravity fall trajectory of the object to be sorted is corrected by the flow straightening plate 25. As a reference example, instead of the current plate 25, an air flow such as wind pressure, static electricity, or the like may be used to correct the gravity falling trajectory of the object to be sorted.

Next, technical ideas that can be grasped from the above-described embodiment and another example will be additionally described below together with their effects.
(A) The sorting device includes the shape of a flat plate, a corrugated plate, a continuous mountain, a continuous bamboo split semi-arc, or a combination thereof.

  DESCRIPTION OF SYMBOLS 10 ... Sorting apparatus, 11 ... Conveyance belt as a conveyance means, 16 ... Magnetic material removal machine as a movement means, 16a ... Rotation pipe | tube, 16b ... Permanent magnet as a 1st magnet, 18 ... Nonmagnetic material channel | path, 19 ... Nonconformity Non-defective passage, 23: second magnet, 24: metal detector, 24a: through passage, 25, 32, 33, 34: rectifying plate, 26: nonmagnetic metal separation device, 27: non-defective passage, 28: nonmagnetic metal separation Board, 29 ... defective product passage.

Claims (4)

A moving means for moving an object to which sorting or mixing of metal is adhered or accompanied so as to move in the horizontal direction;
A metal detector having a cylindrical through passage provided downstream of the moving means and vertically penetrating and having an antistatic layer formed on the inner surface;
In a sorting device provided downstream of the metal detector, the sorting device including a sorting material containing a metal and a sorting material separating a sorting material not containing a metal.
The to-be-sorted object is configured to fall down by gravity while moving in the horizontal direction from the downstream end of the moving means,
The sorting device characterized in that the straightening vane which changes the gravity fall trajectory is provided on the upstream side of the penetration passage at a position where the gravity fall trajectory of the object to be sorted is not in contact with the inner surface of the penetration passage.   The moving means is a conveying means for conveying the object in the horizontal direction, a magnetic substance removing machine having a cylindrical rotating cylinder for removing the magnetic metallic substance on the circumferential surface while rotating in the conveying direction, or a combination thereof The sorting apparatus according to claim 1, characterized in that:   The said to-be-sorted thing is a powder or granular foodstuffs, The sorting apparatus of Claim 1 or Claim 2 characterized by the above-mentioned. The magnetic substance removing machine is configured to dispose a first magnet inside the rotary cylinder, receive the magnetic substance on the surface of the rotary cylinder, and discharge the sorted matter including the magnetic substance to the defective product passage.
The sorting apparatus according to claim 2 , wherein a second magnet removable from the outside is disposed inside the defective product passage.