JP3112812U - Ore transport device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ore transporting device capable of easily and reliably taking out a metal piece from transported ore.
A belt conveyor 2c that conveys ore 14 along a conveyance path, a metal piece detection device 6 that is provided on the conveyance path and detects a metal piece mixed in ore 14 and outputs a signal; A bag body support device 13 that is disposed on the downstream side of the metal piece detection device 6 with respect to the conveyance direction A of the ore 14 and supports the bag body 18 so as to be dropped, and an output signal of the metal piece detection device 6 Ore transport device having a control device 27 for controlling the operation of the bag support device 13 based on the above. The control device 27 drops the bag body 18 supported by the bag body support device 13 when a signal indicating that the metal piece is detected is output from the metal piece detection device 6. Since the metal piece is in the ore 14 near the dropped bag body 18, the manager can easily find the metal piece with the bag body 18 as a mark.
[Selection] Figure 2

Description

  The present invention relates to an ore transporting device for transporting ores such as limestone.

  For example, when looking at mining facilities that mine ores, the ore mined at the top of the mountain is crushed to an appropriate size while being transported on a belt conveyor in the mine, and then several tens of kilometers installed. Transferred to a long-distance belt conveyor and transferred to a beneficiation site. Thus, when conveying an ore using a belt conveyor, the part of an in-mine facility, a missing item, etc. may mix as a metal piece in the conveyed ore. Thus, when a metal piece mixes in an ore, there exists a possibility that a belt conveyor and crushing equipment may be damaged by the metal piece.

  In order to avoid damage to a belt conveyor or the like caused by such a metal piece, a technique of detecting a metal piece mixed in the transported ore with a metal piece detection device has been conventionally known (for example, patent document). 1). Further, as an apparatus for removing metal pieces mixed in a granular material, an apparatus for taking out and removing metal pieces by vacuum is known (for example, see Patent Document 2).

JP 2001-356178 A (page 4, FIG. 5) JP 2002-001231 A (2nd page, FIG. 1)

  If it is an engineer who belongs to the technical field of the ore conveying device, by operating the metal piece removing device disclosed in Patent Document 2 in conjunction with the detection result of the metal piece detecting device disclosed in Patent Literature 1, A technique for removing metal fragments mixed in ores conveyed by a belt conveyor may be foreseen. However, the speed of the belt conveyor for conveying the ore is very high, for example, 300 m / min. Even if it is detected that metal pieces are mixed in the ore, the recovery using the vacuum is performed. It was difficult to take out metal pieces from the ore by the method or other methods.

  This invention is made in view of said problem, Comprising: It aims at providing the ore conveying apparatus which can take out a metal piece easily from the ore conveyed.

  The ore transport device according to the present invention includes an ore transporting means for transporting ore along a transport path, and a metal strip detection for detecting a metal piece provided on the transport path and mixed in the ore and outputting a signal. Means, an identification body support means disposed on the downstream side of the metal piece detection means with respect to the transport direction of the ore and supporting the identification body so that it can fall, and an output signal of the metal piece detection means Discriminator control means for controlling the operation of the discriminator support means on the basis of the information, and the discriminator control means outputs the signal indicating that the metal piece is detected from the metal piece detection means. The discriminator supported by the discriminator support means is dropped.

  In the above configuration, the “ore transporting means” can be configured by, for example, a belt conveyor. In this case, the “conveying path” is realized by the circular movement of the belt conveyor. The “metal piece detecting means” can be configured by a device that detects a metal piece according to an arbitrary principle. For example, after a magnetic field is generated around the ore transport path, the metal piece is detected by a change in the magnetic field. Can be used. The “identifier” is an object placed on the ore in order to identify a specific position in the ore being conveyed.

  According to the ore transport device according to the present invention, when a metal piece is detected by the metal piece detection means, the identification body supported by the identification body support means can be dropped onto the ore on the ore transportation means. . After the belt conveyor is stopped, the administrator can easily find the metal piece detected by the metal piece detection means from the ore by examining the vicinity of the place where the identification object is placed, and locate the metal piece in the ore. Can be removed.

  Next, in the ore transporting apparatus according to the present invention, it is desirable that the identification body is an inelastically deformable object. Here, “inelastic deformation” means that it can be deformed and no elastic restoring force is generated when it is deformed. For example, a rubber ball generates an elastic restoring force when it is deformed and bounces, so that it is not very desirable as an identifier in the present invention. This is because an object that generates elastic restoring force when deformed may not be able to accurately indicate the position of the drop when the object falls on the moving ore and the object bounces. Because. If the discriminator is formed by an inelastically deformable object as in the present invention, the discriminator deforms inelastically when it falls on the ore, so it always stays in its fall position without bouncing. Therefore, the drop position can always be indicated accurately.

  Next, the “inelastically deformable object” can be formed by, for example, a bag body in which a plurality of solid materials are stored in a bag. If this bag is used, a plurality of solid materials can freely move in the bag, so that the bag as a whole can be inelastically deformed. The solid material itself may be any of a material that elastically deforms, a material that elastically deforms, and a material that neither elastically deforms nor inelastically deforms. However, if there is a risk that discriminating bodies that have fallen on ores transported at high speed may bounce and cause variations in the falling position of the discriminating bodies, avoid using elastically deformable substances as solid materials. May be better.

  Moreover, it is desirable that the bag itself constituting the bag body is formed of a sheet-like substance that can be freely deformed. Assuming that the bag itself is formed of a material that cannot be deformed, such as a hard metal film or a hard resin film, the bag body is dropped when it is dropped on ore that is conveyed at high speed. This is because it is considered difficult to stay on the exact falling position by rolling or sliding on the ore.

  Next, it is desirable that the solid material constituting the bag is, for example, one of stone grains, sand grains, metal grains, resin grains, or a combination of at least two thereof. The bag is preferably one of a cloth bag, a resin bag, a paper bag, a metal bag, or a combination of at least two of them. According to this configuration, when the bag body is dropped on the ore conveyed at high speed, the bag body can be prevented from bouncing or sliding, and therefore an accurate drop position can always be indicated.

  Next, in the ore conveying apparatus according to the present invention, the ore conveying means may be a belt conveyor, and the speed of the belt conveyor may be 40 to 400 m (meters) / minute. In this case, it is preferable that the distance between the metal piece detection means and the identification body support means is 0.5 to 5.0 m. By doing so, the distance between the metal piece mixed in the ore and the identification object falling on the ore will not be too large, and the metal piece can be easily found from the vicinity of the identification object.

  Next, in the ore conveying apparatus according to the present invention, the ore conveying means has a plurality of belt conveyors that are continuous with each other, and the ore conveying apparatus is based on an output signal of the metal piece detecting means. A conveyor control means for controlling the operation of the belt, wherein the conveyor control means is a belt on which the metal piece detection means is installed when a signal indicating that the metal piece is detected is output from the metal piece detection means. It is desirable to stop the conveyor and the belt conveyor located upstream from it.

  The belt conveyor does not necessarily have to be stopped immediately after the metal piece is detected by the metal piece detection means. After a piece of metal is detected, the belt conveyor may be stopped after the ore has been transported a long distance. Even in this case, since the identification body is placed in the vicinity where the metal piece exists, the metal piece can be detected by examining the periphery of the identification body.

  However, when the ore is transported for a long distance after the metal piece is detected, there is a high possibility that the position of the identification body is shifted during the transport. On the other hand, as described above, if the belt conveyor is stopped immediately after the metal piece is detected by the metal piece detecting means, it is possible to prevent the identification body from moving greatly from the falling position. It is always possible to accurately indicate where metal pieces are mixed.

Hereinafter, the case where the ore transporting apparatus according to the present invention is used for transporting a mined product in a mine will be described as an example. Of course, the present invention is not limited to this embodiment.
FIG. 1 shows the entire mine facility. At the summit face not shown in FIG. 1, ore such as limestone is crushed and mined by blasting. The mined limestone is loaded on a transport vehicle such as a dump truck and is put into the first shaft 1a and the second shaft 1b.

  The ore thrown into the first shaft 1a and the second shaft 1b is transported to the primary crushing chamber in the shaft through the split chamber, and, for example, a gyratory crusher in the primary crushing chamber in the shaft. And it is crushed to a size of about 200 mm by a jaw crusher. Next, the ore is transported to the secondary crushing chamber, where it is crushed to a size of about 80 mm by an impeller breaker, for example.

  The ores crushed to about 80 mm by the crushing equipment as described above inside the vertical shaft 1a and the vertical shaft 1b are next to a plurality of continuous or nine long distance belt conveyors 2a, 2b, 2c,. ... is transported on 2i and sent to a beneficiation facility installed at a location away from the mine. The first belt conveyor 2a is a belt conveyor installed between the first shaft 1a and the second shaft 1b. The belt conveyors 2a, 2b, 2c,..., 2i constitute ore conveying means in the present invention.

  The belt width of each of the nine long distance belt conveyors 2a, 2b, 2c,..., 2i is about 900 mm, and the total length of the nine belt conveyors is, for example, about 23 km, and the altitude difference is about 850 m. is there. Each belt conveyor 2a, 2b, 2c,..., 2i moves around in accordance with the rotation of the drive roller 3. The upper traveling part of the belt conveyor that moves around constitutes a conveyance path for conveying the ore 14. The operation of the driving roller 3 of each belt conveyor is individually controlled by a conveyor control device 4.

  The conveyor control device 4 rotates each drive roller 3 so that the belt speed becomes about 300 m / min, for example. Moreover, the conveyor control apparatus 4 can stop each drive roller 3 separately as needed. When the belt speed of each belt conveyor 2a, 2b, 2c,..., 2i is controlled to 300 m / min, the long-distance belt conveyors 2a, 2b, 2c,. 450 tons / hour.

  Long-distance belt conveyors 2a, 2b, 2c, ... About 80mm ore transported to the beneficiation equipment by 2i is crushed, sieved, washed with water according to the applications such as steel, cement, construction aggregate, chemicals, etc. Medium split (80-40mm), special split (40-20mm), split (30-10mm), new split (20-5mm), sintered powder (5mm), fine powder (30mm), crushed It is stored in the mine for each rank of powder (4 to 0.15 mm).

  Of the long-distance belt conveyors 2a, 2b, 2c,..., 2i as a whole, the first belt conveyor 2b as viewed from the second shaft 1b includes a metal piece detector 6 and a metal piece. A remover 7 and a television camera 8 are installed. The metal piece detection device 6 and the metal piece removal machine 7 constitute a first metal piece collection device 11. The output terminal of the metal piece detection device 6 is connected to the input terminal of the metal piece removal control device 9. Further, the input terminal of the metal piece removal machine 7 is connected to the output terminal of the metal piece removal control device 9.

  The metal piece detection device 6 includes, for example, a coil that surrounds one periphery of the belt conveyor 2b, and a high-frequency alternating magnetic field is formed around the belt conveyor 2b by passing an electric current through the coil. When metal pieces are mixed in the ore 14 conveyed by the belt conveyor 2b, this magnetic field changes and a detection signal is output to the output terminal of the metal piece detection device 6, and this detection signal is used for the metal piece removal control. Sent to the device 9.

  The size of the metal piece that can be detected by the metal piece detection device 6 can be freely determined by appropriately setting the threshold value of the detection circuit. In the present embodiment, the sensitivity of the metal piece detection device 6 is adjusted so that a metal piece larger than an iron plate of 150 mm × 150 mm can be detected.

  The metal piece removing machine 7 has an electromagnet arranged to face the conveyance path formed by the belt conveyor 2b. When the metal piece removal control device 9 receives the detection signal from the metal piece detection device 6, the control device 9 applies current to the electromagnet in the metal piece removal device 7 to excite it. The metal piece detected by the metal piece detection device 6 is magnetically attracted to the electromagnet excited in the metal removal machine 7 and removed from the belt conveyor 2b and thus the ore. This removal process for the metal piece is photographed by the television camera 8, displayed on a monitor screen installed in a control room (not shown), and monitored by an administrator.

  By the way, the nine long distance belt conveyors 2a, 2b, 2c,..., 2i used in the present embodiment are configured using steel cord belts. With regard to this steel cord belt, since there is a lot of steel at the joint part of the belt, usually twice as much, the metal detector 6 may detect not only the metal piece but also the built-in steel at the joint part. . Since it is not desirable for the metal piece removal machine 7 to operate when the metal detection device 6 detects steel in the belt joint location, the metal piece removal control device 9 is typically used in the belt joint location. It is set to perform control so that the metal piece removing machine 7 is not operated even if steel is detected.

  For this reason, when the metal piece is accidentally placed on the belt joint, the metal piece flows downstream without being collected by the metal piece removing machine 7. Further, the metal piece removing machine 7 may not be able to recover the metal piece depending on the case. For example, if the metal piece is hidden under the rough stone, the metal piece may not be attracted by the magnetic force of the metal piece removing machine 7. Also in this case, the metal piece flows downstream. In this way, the second belt conveyor as viewed from the second shaft 1b in order to be able to recover the metal pieces accidentally placed on the belt joint location and the metal pieces that could not be removed by the metal piece removing machine 7. The 2nd metal piece collection | recovery apparatus 12 is installed in 2c.

  The second metal piece collection device 12 includes a magnetic-type metal piece detection device 6 having the same configuration as the metal piece detection device 6 used in the first metal piece collection device 11 and a bag dropping device 13. . Since the configuration and operation of the metal piece detection device 6 have already been described, description thereof is omitted here. Details of the bag drop device 13 are shown in FIG. In FIG. 2, a part of the upper traveling body of the belt conveyor 2c, that is, a part of the conveyance path for the ore 14 is shown. The belt conveyor 2c moves in the direction indicated by the arrow A while being received by the driven roller 16. Although only one set of the driven rollers 16 is shown in FIG. 2, actually, a plurality of sets are provided at appropriate intervals along the moving direction A of the belt conveyor 2c.

  The bag dropping device 13 includes a gantry 16 installed so as to straddle the belt conveyor 2c, a bag body support device 17 installed on the gantry 16, and a bag body 18 supported by the bag body support device 17 so as to be dropped. And have. The bag body 18 includes a bag 19 formed by one or a combination of a cloth bag, a resin bag, a paper bag, and a metal bag, and a plurality of solid materials 21 accommodated in the bag 19. The bag body 18 functions as an identification body in the present invention, and the bag support device 17 functions as an identification body support means in the present invention.

  The solid material 21 is formed of one of stone grains, sand grains, metal grains, resin grains, or a combination of at least two thereof. The term “grain” as used herein means not only small grains falling within the range of several mm to several tens of mm but also relatively large grains in which only one or several grains are placed on the palm of a human being. Further, the solid material 21 itself may be any of a material that elastically deforms, a material that elastically deforms, and a material that neither elastically deforms nor inelastically deforms.

  Note that the elastically deformable substance is a substance that generates an elastic restoring force when deformed, and is a substance that may be bounced by the elastic restoring force. As such a substance, for example, a rubber ball or the like can be considered. The inelastically deforming substance is a substance that deforms but does not generate an elastic restoring force during the deformation. As such a substance, for example, a substance that can be freely displaced and deformed is conceivable. Moreover, the substance that neither elastically deforms nor inelastically deforms is, for example, a substance that is neither deformed nor damaged when dropped from a height of several meters. Examples of such a substance include stone, hard metal, and hard resin.

  Since the bag 18 is configured as described above, when it is removed from the bag support device 17 and dropped onto the ore 14, the bag 18 does not bounce or slide on the ore 14, You can stay in that position. The bag body support device 17 can be configured by an electromechanical device having an arbitrary configuration that can support the bag body 18 so as to be dropped. For example, the bag support device 17 can be configured as shown in FIG. 3, (a) is a plan view of the bag support device 17, (b) is a side view thereof, and (c) is a front view thereof.

  As shown in these drawings, the bag support device 17 includes a support plate 22 fixed on the gantry 16, an electromagnetic solenoid 23 as a drive source supported by the support plate 22, and a swing link as a connection mechanism. 24. The swing link 24 is rotatably supported by the support plate 22 at the intermediate position P0. The rear end of the swing link 24 is connected to the output shaft 23a of the electromagnetic solenoid 23, and a hook 26 as a locking member is fixed to the front end.

  The electromagnetic solenoid 23 is connected to the input terminal of the identification body control device 27 shown in FIG. The identification body control device 27 is connected to the output terminal of the metal piece detection device 6. The electromagnetic solenoid 23 in the state shown in FIG. 3B is in a power OFF state, and the swing link 24 is not pulled by the electromagnetic solenoid 23 in this state. At this time, the hook 26 is in a closed state, and the ring 28 of the bag body 18 is caught on the hook 26. In this state, the bag body 18 is supported by the bag body support device 17 via the hook 26.

  In FIG. 2, when the metal piece detection device 6 detects a metal piece mixed in the ore 14, a detection signal is sent to the identification body control device 27, and the identification body control device 27 that has received the detection signal is shown in FIG. A current is supplied to the electromagnetic solenoid 23. The electromagnetic solenoid 23 receiving the current is turned on to draw the output shaft 23a in FIG. 3B, and the swing link 24 swings around the support point P0 accordingly, and the hook 26 opens. As a result, the ring 28 of the bag 18 is detached from the hook 26 and the bag 18 falls. The electromagnetic solenoid 23 is then immediately turned off and closed. The bag body 18 dropped from the hook 26 falls on the ore 14 conveyed by the belt conveyor 2c in FIG. Since the bag body 18 is an object that can be deformed inelastically, the bag body 18 that has dropped onto the ore 14 stays at the position where it has dropped without bouncing or sliding.

  The distance L0 between the position where the metal piece detecting device 6 detects the metal piece and the position where the bag body 18 is supported is set in advance to a predetermined distance. For example, L0 = 0.5 to 5 m, preferably 1.8 m. The speed of the belt conveyor 2a is also set in advance to a predetermined speed, for example, 40 to 400 m / min, preferably 300 m / min. Therefore, the bag 18 that has fallen on the ore 14 functions as an identification body that indicates that there is a metal piece in the vicinity thereof.

  As described above, when a metal piece is detected by the metal piece detection device 6, the bag body 18 as an identification body is dropped on the ore 14. Further, in FIG. 1, when the metal piece detecting device 6 provided on the second belt conveyor 2c as viewed from the second shaft 1b detects the metal piece, the conveyor control device 4 detects that the metal piece is detected. The rotation of the driving roller 3 of 2c and the rotation of the driving roller 3 of the belt conveyors 2b and 2a located on the upstream side are stopped. Thereby, the circular movement of those belt conveyors 2c, 2b, 2a stops. At this time, the circular movement of the belt conveyors 2d to 2i ahead of the belt conveyor 2c may be stopped or continued.

  When the movement of the belt conveyor 2c in which the metal piece is detected stops, the manager goes to the belt conveyor 2c and searches for the metal piece from the ore 14 in the vicinity where the bag 18 is placed. According to the results of the present inventors, a metal piece can be found within a range of 100 mm around the bag 18 serving as a mark. According to the results, it is considered sufficient to search the range of 1 m around the bag 18. In addition, the search for the metal piece may be performed by an administrator's visual observation, or may be performed using a metal detector. The found metal pieces are removed from the ore 14 by the administrator. The manager who has collected the metal piece hooks the bag body 18 on the hook 26 again. Then, the operation of the belt conveyor 2c and the like is resumed.

  2, if the movement of the belt conveyor 2c is immediately stopped by the conveyor control device 4 of FIG. 1 when the metal piece detection device 6 detects the metal piece, the metal piece will be in the vicinity of the metal piece detection device 6. Therefore, it seems that the metal piece can be searched for without dropping the bag body 18 on the ore 14. In practice, however, metal fragments are not easily found by that method. The reason is that the braking distance of the belt conveyor 2c or the like, that is, the distance that the belt conveyor moves from the start of the belt conveyor stop operation until the belt conveyor is completely stopped, is the amount of ore transported by the belt conveyor. It is because it fluctuates according to.

  If it demonstrates concretely, the belt conveyor 2c etc. will not necessarily always convey the ore 14 with the same amount of ores. For example, there are usually fluctuations in the amount of ore being sent within a range of 1,000 to 2,450 tons / hour. Thus, if there is a fluctuation in the amount of transport, the braking distance of the belt conveyor 2c and the like changes variously, and the belt conveyor does not stop at a fixed position. Therefore, the exact position of the metal piece cannot be specified only by stopping the belt conveyor when the metal piece is detected by the metal piece detection device 6. On the other hand, when the metal piece is detected by the metal piece detection device 6 and the belt conveyor 2c or the like is stopped, if the bag body 18 is dropped on the ore 14 at the same time, in FIG. The distance of the dropped bag 18 to the metal piece is a constant distance determined by the distance L0 between the metal piece detecting device 6 and the support position of the bag 18 and the moving speed of the belt conveyor 2c, etc. It becomes possible to find a metal piece very easily using the bag 18 as a mark.

  In addition, in FIG. 1, since the metal piece removing machine 7 installed on the first belt conveyor 2b as viewed from the second shaft 1b uses an electromagnet, iron can be recovered, but stainless steel, highman material, aluminum, etc. are recovered. Can not. On the other hand, since the metal piece detection device 6 installed on the second belt conveyor 2c can detect any metal as well as iron, stainless steel, highman material, and aluminum, there are many kinds of detection mechanisms using the bag body 18. You can find and collect metal pieces. For example, even when a special metal piece derived from a member such as a shoe liner or a crusher striking plate falls on the belt conveyor and is conveyed along with the ore 14, the metal piece can be reliably found and recovered.

(Other embodiments)
The present invention has been described with reference to the preferred embodiments. However, the present invention is not limited to the embodiments, and various modifications can be made within the scope of the invention described in the claims.
For example, in the above embodiment, the present invention is applied to one belt conveyor 2c in the ore mining system of FIG. 1, but the present invention may be applied to one or a plurality of other belt conveyors. it can. Moreover, although this invention was applied to the ore conveying apparatus for conveying limestone in the above embodiment, this invention is applicable also to the conveying apparatus of ores other than limestone.

  In the above embodiment, the bag body 18 having the shape shown in FIG. 2 is used. However, the shape of the bag body 18 can be freely determined as necessary. Further, in the above embodiment, the identification body support device 17 that supports the bag body 18 so as to be dropped is configured to use the electromagnetic solenoid 23 and the link mechanism as shown in FIG. Can be freely determined as needed.

It is a figure which shows the whole mining system of the mine using the ore conveying apparatus which concerns on this invention. It is a perspective view which shows one Embodiment of the ore conveying apparatus which concerns on this invention. It is a figure which shows an example of the identification body support apparatus which is the principal part of the ore conveying apparatus shown in FIG.

Explanation of symbols

1a, 1b. Shaft, 2a-2i. Belt conveyor (ore transport device),
3. Driving roller, 6. 6. Metal piece detection device, Metal piece removing machine, 8. TV camera,
11. 11. first metal piece collection device, 12. Second metal piece collection device, Bag drop device,
14 Ore, 16. Gantry, 17. Bag support device (identifier support device),
18. 18. Bag (identifier), Bag, 21. Solids, 22. Support plate,
23. Electromagnetic solenoid (drive source), 24. Swing link (coupling mechanism),
26. Hook (locking member), 28. Ring, P0. Intermediate position

Claims (7)

Ore conveying means for conveying the ore along the conveying path;
Metal piece detection means provided on the conveyance path and detecting a metal piece mixed in the ore and outputting a signal,
Discriminator support means that is arranged on the transport path and downstream of the metal piece detection means with respect to the transport direction of the ore and supports the discriminator so that it can fall.
Discriminator control means for controlling the operation of the discriminator support means based on the output signal of the metal piece detection means,
The ore transporting apparatus, wherein the discriminator control means drops the discriminator supported by the discriminator support means when a signal indicating that the metal piece is detected is output from the metal piece detection means. 2. The ore transport device according to claim 1, wherein the identification body is an inelastically deformable object.   3. The ore transport device according to claim 2, wherein the object is a bag formed by storing a plurality of solid substances in a bag. In the ore conveying apparatus according to claim 3,
The solid is one of stone grains, sand grains, metal grains, resin grains, or a combination of at least two thereof;
The ore conveying apparatus, wherein the bag is one of a cloth bag, a resin bag, a paper bag, a metal bag, or a combination of at least two of them. The ore conveying device according to any one of claims 1 to 4, wherein the identifier support means is
A locking member that moves between a support position that supports the identifier and a non-support position that allows the identifier to fall;
A drive source for moving the locking member;
A coupling mechanism coupling the locking member and the drive source;
An ore transporting device characterized by comprising:   6. The ore conveying device according to claim 1, wherein the ore conveying means is a belt conveyor, and the speed of the belt conveyor is 40 to 400 m (meters) / minute, and the metal piece The distance between a detection means and the said identification body support means is 0.5-5.0 m, The ore conveying apparatus characterized by the above-mentioned. In the ore conveying apparatus according to any one of claims 1 to 6,
The ore conveying means has a plurality of belt conveyors continuous with each other,
The ore transporting apparatus further includes a conveyor control unit that controls operations of the plurality of belt conveyors based on an output signal of the metal piece detection unit,
The conveyor control means includes a belt conveyor provided with the metal piece detecting means and a belt conveyor located upstream from the metal piece detecting means when a signal indicating that the metal piece is detected is output from the metal piece detecting means. Ore transport device characterized by stopping.

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