Conveyance device and, conveyance method

Abstract

To provide a conveyance device or the like capable of appropriately conveying a brittle material having a magnetic property.SOLUTION: A conveyance device has: a supply port through which a brittle material having a magnetic property is supplied; a discharge port through which the brittle material is discharged; and a connection part that connects the supply port and the discharge port. The connection part has a supply port side located at a higher position than a discharge port side, and has a magnetism generation part that generates magnetic field intensity sufficient to hold the brittle material. According to the conveyance device or the like of the present invention, when the brittle material having the magnetic property is supplied, the brittle material can be retained in a magnetic field generated by the magnetism generation part. As a result, a raw material reservoir can be formed in the magnetism generation part. The brittle material supplied from the supply port decreases the movement speed when it falls into the raw material reservoir. This makes it possible to reduce a collision energy applied to the brittle material, and to suppress powdering of the brittle material.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a conveying device for conveying a brittle material having magnetism and a conveying method.

Background Art

[0002] As an iron-making raw material used in the blast furnace method, for example, coke can be mentioned. High-quality caking coal is the raw material for coke. Caking coal has been showing an upward trend in price due to excessive demand in recent years. To address this problem, new coke manufacturing technologies such as the "formed coal blending method" for using low-grade coal have been developed.

[0003] In the formed coal blending method, at least a part of the coal charged into the coke oven is replaced with formed coal. Formed coal is manufactured by mixing crushed coal and a binder and subjecting the mixture to pressure molding.

[0004] Formed coal is conveyed to the coke oven via a conveying line including a hopper, a chute, and a belt conveyor. When the formed coal is charged into the coke oven, not only the case where only the formed coal is charged into the coke oven but also the case where a mixture of formed coal and pulverized coal is charged may occur.

[0005] Formed coal is molded with coal particles in a state where they are close to each other. When such formed coal is heated to be softened or melted, fusion is promoted. For this reason, in formed coal, the blending ratio of low-grade non-caking coal can be increased. As the raw material for coke, the higher the blending ratio of formed coal to all coal, the more non-caking coal can be used.

[0006] In addition, by blending formed coal into the raw material for coke, the average bulk density of the coal increases, so the amount of coal charged can be increased, and the productivity of coke can be improved.

[0007] The formed coke breaks and pulverizes when it collides with the wall surface of the conveying line or other formed coke. When the formed coke breaks, the unbonded coke is released to the outside. Since the part where the unbonded coke is released becomes fragile, the strength of the coke decreases. In the formed coke blending method, it is required to suppress the pulverization of the formed coke when it is conveyed.

[0008] As a method for suppressing the pulverization of the formed coke, a method for alleviating the impact of the formed coke can be mentioned. As a method for alleviating the impact of the formed coke, for example, Patent Document 1 discloses charging the formed coke after forming a coke layer at the bottom of the coke oven.

[0009] Due to the unevenness of the surface of the coke layer formed at the bottom of the coke oven, the contact area between the formed coke and the coke increases. As a result, the impact received by the formed coke falling according to free fall can be dispersed. Further, when the formed coke falling on the coke layer collides, the minute coke located in the gaps of the coke layer moves. As a result, since the kinetic energy at the time of collision is consumed, the energy acting on the formed coke is reduced.

[0010] Further, Patent Document 2 discloses an apparatus for preventing pulverization of sintered ore in which a plurality of sintered ore flow rate suppressing plates are fixedly provided perpendicular to the flow direction of the sintered ore on an inclined surface provided between a hot crusher and a cooler of a sintering machine. In Patent Document 2, since the sintered ore becomes a resistance to the flow direction by the flow rate suppressing plate or the raw material accumulation on the flow rate suppressing plate, its flow rate decreases.

Prior Art Documents

Patent Documents

[0011]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0012] However, the method of Patent Document 1 is specialized for preventing pulverization in the coke oven. Therefore, for example, in a general hopper or chute existing on the conveying line, since the formed coke is discharged intermittently or continuously, even if coke is laid at the dropping point of the formed coke, it will be discharged together with the formed coke. For this reason, in this member, since the effects described in Patent Document 1 cannot be obtained, there remains a problem of pulverization.

[0013] Also, when non-bonded carbon is released from the formed coke to the outside due to the impact during conveyance, it adheres to the wall surface of the conveyance path or the like. When the formed coke is conveyed in such a state, the formed coke may adhere to the wall surface of the conveyance path. The granular formed coke adhering to the wall surface of the conveyance path repeatedly combines with other granular formed coke to form a lump. As a result, there is a risk that the conveyance of the formed coke may be hindered by the lump of formed coke. Such a phenomenon tends to occur more easily as the particle size of the formed coke becomes smaller.

[0014] Also, when a large amount of moisture is contained in the raw material due to rainfall or the like, a water film may be formed on the surface of the formed coke by liquid bridging force. The formed coke with a water film may become lumpy or adhere to the wall surface of the conveyance path as described above.

[0015] Furthermore, when a large amount of moisture is contained in the formed coke, the clay content may swell due to the moisture and become sticky. Also, the formed coke with strong stickiness may become lumpy or adhere to the wall surface of the conveyance path as described above. Hereinafter, the inhibition of the conveyance of the formed coke due to such a state of the formed coke is also referred to as the raw material adhesion risk.

[0016] When a flow rate suppression plate as in Patent Document 2 is applied to a location where fine particles exist to form a raw material accumulation, granular raw materials will be retained in the raw material accumulation. The retained granular raw materials become factors for the formation of the above-mentioned lump of raw materials. For this reason, there is still a risk that the conveyance of iron-making raw materials may be hindered.

[0017] In addition, Patent Document 2 describes a configuration in which a flow rate suppression plate is combined with a pan conveyor, and raw materials staying on the flow rate suppression plate are discharged onto a conveyance path by the rotation of the conveyor. If such a configuration is provided, for example, in a hopper or a chute, large-scale equipment is required, so it is practically difficult to apply the configuration described in Patent Document 2 to anything other than a conveyor. Incidentally, the above problems can occur not only in molded charcoal but also in general iron-making raw materials such as sintered ore that are likely to crack or chip when being conveyed.

[0018] Furthermore, a brittle material is a fragile material with a small amount of energy absorbed during fracture. The above problem is a problem that can occur not only in iron-making raw materials but also when conveying brittle materials.

[0019] The present invention has been made in view of the above problems, and an object thereof is to provide a conveying device and the like capable of appropriately conveying brittle materials.

Means for Solving the Problems

[0020] In order to solve the above problems, the present invention has the following features. [1] A conveying device having a supply port to which a brittle material having magnetism is supplied, a discharge port for discharging the brittle material, and a connecting portion connecting the supply port and the discharge port, wherein the connecting portion has a magnetic generating portion that generates a magnetic field strength capable of holding the brittle material, with the supply port side positioned higher than the discharge port side. [2] The brittle material is an iron-making raw material, and the conveying device according to [1]. [3] The magnetic field strength generated by the magnetic generating portion is 1500 gauss or more, and the conveying device according to [1] or [2]. [4] The connecting portion is formed in a cylindrical shape, The magnetic generation unit is provided on the wall portion of the connection portion located in the supply direction of the brittle material and is arranged to generate the magnetic field strength along the circumferential direction of the wall portion. The conveying device according to any one of [1] to [3]. [5] The connection portion is formed in a cylindrical shape. The magnetic generation unit is provided in plurality along the height direction of the wall portion of the connection portion and is arranged to generate the magnetic field strength along the circumferential direction of the wall portion. The conveying device according to any one of [1] to [4]. [6] The connection portion is formed in a cylindrical shape and has an inclined portion formed such that the lower part in its height direction becomes narrower. The magnetic generation unit is provided in plurality along the height direction of the inclined portion and is arranged to generate the magnetic field strength along the circumferential direction of the wall portion. The magnetic field strength of the magnetic generation unit arranged on the lower position side is lower than the magnetic field strength of the magnetic generation unit arranged on the upper position side. The conveying device according to [5]. [7] The magnetic generation unit is an electromagnet. The conveying device according to any one of [1] to [6], having an adjustment unit for adjusting the magnetic field strength generated by the magnetic generation unit. [8] A conveying method using the conveying device according to any one of [1] to [7], comprising: A supply step of supplying the brittle material from the supply port; An adjustment step of adjusting the moving speed of the brittle material by the magnetic generation unit; A discharge step of discharging the brittle material from the discharge port. The conveying method having the above steps. [Advantages of the Invention]

[0021] According to the conveying device and the like of the present invention, the conveying device has a magnetic generating portion that generates a magnetic field intensity capable of holding a brittle material having magnetism at a connection portion connecting a supply port and a discharge port. Thereby, when the brittle material is supplied, the brittle material can be retained in the magnetic field generated by the magnetic generating portion. As a result, a raw material accumulation can be formed in the magnetic generating portion. When the brittle material supplied from the supply port falls into the raw material accumulation, its moving speed decreases. Thereby, the collision energy applied to the brittle material can be reduced, and pulverization of the brittle material can be suppressed.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0023] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of a conveying device. The conveying device 100 is a device for conveying a brittle material having magnetism. Examples of the brittle material include those that are likely to crack or chip due to the impact during conveyance. Examples of such a brittle material having magnetism include, for example, iron-making raw materials, minerals, etc. Examples of the iron-making raw material having magnetism include, for example, sintered ore, formed coke, HBI (Hot Briquetted Iron), etc. In the present embodiment, an example will be described in which formed coke is used as the brittle material having magnetism, and the conveying device 100 is used as a device for conveying the formed coke.

[0024] As shown in FIG. 1, in the present embodiment, the conveying device 100 is formed in a cylindrical shape. As the conveying device 100, for example, a hopper or a chute can be used. In the present embodiment, an example in which a chute is used as the conveying device 100 will be described.

[0025] The formed coke is one having magnetism such as ferrocoke. Incidentally, the brittle material only needs to have magnetism that can be magnetically attached to the magnetic generation unit described later, and preferably contains a ferromagnetic material. The brittle material preferably contains 5% by mass or more of the ferromagnetic material, more preferably 10% by mass or more, still more preferably 20% by mass, and even more preferably 30% by mass or more. The higher the content of the ferromagnetic material in the brittle material, the better, and particularly there is no need to set an upper limit.

[0026] The conveying device 100 has a supply port 10 to which the formed coke SM is supplied, a discharge port 20 for discharging the formed coke SM, and a connection portion 30 connecting the supply port 10 and the discharge port 20.

[0027] The supply port 10 is provided on the upper end side of the conveying device 100. A belt conveyor 41 is connected to the supply port 10. In other words, the end of the belt conveyor 41 provided on the supply port 10 side is located above the supply port 10. The formed charcoal SM supplied from the belt conveyor 41 is loaded into the conveying device 100 through the supply port 10. Incidentally, the operating direction of the belt conveyor 41 is the supply direction D1 in which the formed charcoal SM is supplied to the conveying device 100.

[0028] The discharge port 20 is provided on the lower end side of the conveying device 100. That is, in the present embodiment, the supply port 10 and the discharge port 20 are arranged in the vertical direction. A belt conveyor 42 is connected to the discharge port 20. In other words, the starting end of the belt conveyor 42 is located below the discharge port 20. The formed charcoal SM discharged from the discharge port 20 is supplied to the belt conveyor 42 and conveyed to a predetermined position.

[0029] The connecting portion 30 is formed in a cylindrical shape. In the present embodiment, the connecting portion 30 is formed in a cylindrical shape. The connecting portion 30 extends in the arrangement direction of the supply port 10 and the discharge port 20, that is, in the vertical direction.

[0030] The connecting portion 30 has a wall portion 32 formed from the supply port 10 toward the discharge port 20, and an inclined portion 33 formed such that the lower part in the height direction becomes narrower.

[0031] In the present embodiment, the inclined portion 33 is formed continuously with the wall portion 32 and is tapered so as to become narrower toward the discharge port 20 on the lower side in the height direction.

[0032] The connection part 30 is provided with a magnetic generation part 50 that generates a magnetic field strength capable of holding a brittle material. The magnetic generation part 50 is not particularly limited, but it is preferable that the magnetic field strength generated by the magnetic generation part 50 is 1500 gauss or more. More preferably, the magnetic field strength is 1500 to 9000 gauss, and even more preferably, it is 2000 to 8000 gauss. Incidentally, the magnetic field strength can be measured using a general gauss meter (also referred to as a tesla meter).

[0033] When the magnetic field strength is 1500 gauss or more, it becomes possible to hold the molded carbon SM in the magnetic generation part 50. As a result, it becomes possible to deposit the molded carbon SM on the connection part 30 provided with the magnetic generation part 50. Incidentally, when the magnetic field strength exceeds 8000 gauss, the amount of the molded carbon SM held by the magnetic generation part 50 tends to increase rapidly. The upper limit of the magnetic field strength may be determined according to the dimensions of the applied conveying device 100 and the like, but in order to adjust the holding amount of the molded carbon SM by the magnetic generation part 50, it is preferably 8000 gauss or less.

[0034] As such a magnetic generation part 50 that generates such a magnetic field strength, for example, a permanent magnet, an electromagnet, etc. can be used. The position where the magnetic generation part 50 is provided is not particularly limited, but in the present embodiment, the magnetic generation part 50 is provided on the wall part 32 and the inclined part 33 of the connection part 30. The magnetic generation part 50 can be provided, for example, by installing it on a pedestal provided on the wall part 32 and the inclined part 33.

[0035] The magnetic generation part 50 is provided on the wall part 32 of the connection part 30 located in the supply direction D1 of the molded carbon SM in the wall part 32. In the present embodiment, the magnetic generation part 50 is provided on the wall part 32 located on the distal side in the supply direction D1 of the molded carbon SM. A plurality of magnetic generation parts 50 provided on the wall part 32 are arranged to generate a magnetic field strength along the circumferential direction of the wall part 32. For example, the magnetic generation part 50 may be arranged over about half of the circumference of the wall part 32.

[0036] The magnetic field strength generated along the circumferential direction of the wall portion 32 may be adjusted according to the manner in which the molded charcoal SM is held by the magnetic generation unit 50. For example, the magnetic field strength can be adjusted so that the molded charcoal SM held by the magnetic generation unit 50 forms a desired angle of repose. Specifically, when viewed from the supply direction D1 of the molded charcoal SM, the magnetic field strength on the center side in the left-right direction can be set stronger than that on the outer side of the supply direction D1.

[0037] A plurality of magnetic generation units 50 are provided along the height direction in the inclined portion 33. The magnetic generation units 50 are arranged to generate a magnetic field strength along the circumferential direction of the wall portion 32.

[0038] In the present embodiment, the magnetic generation units 50 are provided across the circumferential direction in the inclined portion 33 on the supply port 10 side. Also, the magnetic generation units 50 are provided across the circumferential direction in the inclined portion 33 on the discharge port 20 side.

[0039] In the inclined portion 33, the magnetic field strength of the magnetic generation unit 50 arranged on the lower position side may be made lower than the magnetic field strength of the magnetic generation unit 50 arranged on the higher position side. In the present embodiment, the magnetic field strength of the magnetic generation unit 50 arranged in the inclined portion 33 on the discharge port 20 side is lower than the magnetic field strength of the magnetic generation unit 50 arranged in the inclined portion 33 on the supply port 10 side. By setting the magnetic field strength in this way, it is possible to suppress the connection portion 30 from being blocked by the molded charcoal SM held by the magnetic generation unit 50.

[0040] Also, the minimum inner diameter of the inclined portion 33 is preferably set to be 7 times or more the average particle diameter of the formed charcoal SM. By setting the minimum inner diameter of the inclined portion 33 in this way, it is possible to suppress the connection portion 30 from being blocked by the formed charcoal SM. The average particle diameter of the formed charcoal SM can be obtained, for example, as follows. Measure the particle size with a caliper, and obtain the equivalent spherical diameter by using a known calculation formula with the measured particle size. The average value of the equivalent spherical diameters of an arbitrary number of particles can be set as the average particle diameter of the formed charcoal SM. Also, when the connection portion 30 has a shape other than a cylinder, the width in the direction perpendicular to the axial direction of the inclined portion 33 is preferably 7 times or more the particle diameter of the formed charcoal SM.

[0041] FIG. 2 shows a mode in which the formed charcoal SM is supplied to the conveying device. In FIG. 2, the formed charcoal SM loaded from the supply port 10 reaches the wall portion 32 following free fall. At this time, the formed charcoal SM is held in the magnetic generation portion 50. When the formed charcoal SM is held in the magnetic generation portion 50, a raw material reservoir 51 is formed.

[0042] In this way, the moving speed of the formed charcoal SM is decelerated by coming into contact with the raw material reservoir 51. The formed charcoal SM whose moving speed has been adjusted to a sufficient level is discharged from the discharge port 20.

[0043] A conveying method for conveying a brittle material will be described using the conveying device 100 described above. FIG. 3 shows the flow of the conveying method using the conveying device 100. As shown in FIG. 3, a brittle material is supplied from the supply port 10 and a supply step is executed (step S01). Next, an adjustment step of adjusting the moving speed of the brittle material by the magnetic generation portion 50 is executed (step S02). Finally, the brittle material is discharged from the discharge port 20 and a discharge step is executed (step S03).

[0044] Still, in the adjustment step of step S02, the movement speed of the formed charcoal SM is adjusted as follows. That is, when the brittle material is supplied from the supply port 10, the formed charcoal SM is held on the wall portion 32 where the magnetic generation portion 50 is arranged. As a result, a raw material accumulation 51 is formed on the wall portion 32. When the formed charcoal SM supplied from the supply port 10 falls into the raw material accumulation 51, its movement speed decreases.

[0045] As described above, according to the conveying device 100 of the present invention, the conveying device 100 has a magnetic generation portion 50 that generates a magnetic field strength capable of holding a brittle material having magnetism in the connection portion 30 connecting the supply port 10 and the discharge port 20. Thereby, when the brittle material is supplied, the brittle material can be retained in the magnetic field generated by the magnetic generation portion 50. As a result, a raw material accumulation 51 can be formed in the magnetic generation portion 50. Therefore, when the brittle material supplied from the supply port 10 as described above falls into the raw material accumulation 51, its movement speed decreases.

[0046] Specifically, the raw material accumulation 51 is formed with irregularities serving as a collision surface on its surface layer. Such a collision surface can increase the contact area with the brittle material. For this reason, the force applied to the brittle material when the brittle material collides with the raw material accumulation 51 can be reduced.

[0047] Also, when the brittle material collides with the raw material accumulation 51, the brittle material of the raw material accumulation 51 moves receiving the energy at the time of the collision. By consuming a part of the collision energy in this kinetic energy, it becomes possible to suppress the pulverization of the brittle material.

[0048] After falling into the raw material accumulation section 51, the brittle material moves along the inclination of the raw material accumulation section 51. The brittle material moving through the raw material accumulation section 51 is decelerated by repeatedly coming into contact with other brittle materials in the raw material accumulation section 51. Therefore, it becomes possible to suppress pulverization of the brittle material discharged to the belt conveyor 42 provided on the discharge port 20 side. Thus, according to the conveying device 100 of the present invention, it becomes possible to appropriately convey the brittle material. Further, when formed coke is used as the brittle material, it is possible to suppress deterioration in the quality of coke, expand the use of low-grade coal, and increase the productivity of the formed coke.

[0049] Further, the magnetic generation section 50 is provided on the wall portion 32 of the connection portion 30 located in the supply direction D1 of the formed coke SM, and is arranged so as to generate a magnetic field intensity along the circumferential direction of the wall portion 32. Thus, the raw material accumulation section 51 of the formed coke SM can be formed in a desired manner. That is, since the raw material accumulation section 51 of the formed coke SM can be formed at an appropriate position in the height direction of the connection portion 30, it becomes possible to reduce the pulverization rate of the formed coke SM.

[0050] Further, a plurality of magnetic generation sections 50 are provided on the wall portion 32 of the connection portion 30 along the height direction of the connection portion 30, and are arranged so as to generate a magnetic field intensity along the circumferential direction of the wall portion 32. Thus, in the height direction of the connection portion 30, a plurality of raw material accumulation sections 51 can be formed. Thereby, it becomes possible to more finely adjust the moving speed of the formed coke SM. Therefore, it becomes possible to further reduce the pulverization rate of the formed coke SM and adjust it to a desired moving speed.

[0051] Furthermore, the conveying device is not limited to the hopper and the chute, and any device may be used as long as it is formed such that the brittle material can freely fall. FIG. 4 shows an embodiment in which the conveying device can be applied. As shown in FIG. 4, as a conveying line, a manufacturing machine 61 for manufacturing a brittle material, a belt conveyor 62 for conveying the brittle material discharged from the manufacturing machine 61, and a vertical conveyor 63 connected to the end of the belt conveyor 62 are provided. The brittle material discharged from the end of the belt conveyor 62 is supplied to the vertical conveyor 63 according to free fall. The conveying device may be provided in a supply area 71 where the brittle material is supplied from the belt conveyor 62 to the vertical conveyor 63 in this way.

[0052] FIG. 5 shows another embodiment in which the conveying device can be applied. As shown in FIG. 5, as a conveying line, a vertical conveyor 63, an inclined conveyor 64 connected to the end of the vertical conveyor 63, and a belt conveyor 65 connected to the end of the inclined conveyor 64 are provided.

[0053] The brittle material discharged from the end of the vertical conveyor 63 is supplied to the inclined conveyor 64 according to free fall. The conveying device may be provided in a supply area 72 where the brittle material is supplied from the vertical conveyor 63 to the inclined conveyor 64 in this way.

[0054] Also, the brittle material discharged from the end of the inclined conveyor 64 is supplied to the belt conveyor 65 according to free fall. The conveying device may be provided in a supply area 73 where the brittle material is supplied from the inclined conveyor 64 to the belt conveyor 65 in this way.

[0055] Even when the conveying device is provided in this way, it is possible to obtain the same operational effects as those of the above-described embodiment.

[0056] (Modification Example) In the above-described embodiment, an example in which the magnetic field strength generated by the magnetic generation unit is constant has been described. The magnetic field strength generated by the magnetic generation unit is preferably adjustable.

[0057] FIG. 6 shows a transport device 200 according to a modified example. For the same configurations as those in the above-described embodiment, the same reference numerals are given and the description thereof is omitted. As shown in FIG. 6, each of the magnetic generation units 50 of the transport device 200 is configured by, for example, an electromagnet. An adjustment unit 52 for adjusting the magnetic field strength is connected to each of the magnetic generation units 50. Therefore, the magnetic field strength is adjusted by adjusting the current supplied to each of the magnetic generation units 50 by the adjustment unit 52. By adjusting the magnetic field strength in this way, for example, when the operation is stopped, the supply of current is stopped and the magnetic field strength is weakened, so that the formed carbon SM attached to the magnetic generation unit 50 can be removed.

[0058] Further, the magnetic field strength measured on the inner wall surface of the wall portion 32 or the inclined portion 33 of the connection portion 30 may be adjusted by adjusting the distance between the magnetic generation unit 50 and the inner wall surface of the wall portion 32 or the inclined portion 33 of the connection portion 30. For example, the magnetic generation unit 50 may be provided using a mechanism (not shown) capable of adjusting the distance from the wall portion 32 or the inner wall surface of the inclined portion 33 of the connection portion 30. Even in this case, the same operational effects as those in the case where the magnetic field strength is adjusted can be achieved.

[0059] In the above-described embodiment, an example in which the magnetic generation unit 50 is provided on the wall portion 32 and the inclined portion 33 has been described. The magnetic generation unit 50 may be provided at any one of the wall portion 32 and the inclined portion 33. Further, the number of magnetic generation units 50 provided is not particularly limited, and may be one.

Example

[0060] (Test Example 1: Powdering Rate Test) Using a test device that simulates the transport device described in the above embodiment, the powdering rate of a brittle material having magnetism was investigated. In the following examples, ferro coke, which is formed carbon, was used as the brittle material having magnetism.

[0061] The number of magnetic generating parts provided in the connection part etc. was changed, and a conveying device of a comparative example, Examples 1 to 8, and Comparative Examples 1 and 2 was provided. In Table 1, the wall part is the position of the wall part located on the distal side in the supply direction of the formed charcoal. The upper part of the inclined part is the position on the supply port side of the inclined part. The lower part of the inclined part is the position on the discharge port side of the inclined part. Also, in each of the examples and the comparative examples, a conveying device was configured using magnetic generating parts having the same magnetic field strength.

[0062] The formed charcoal on the conveyor provided on the discharge port side was collected and sieved. The mesh size of the sieve was 15 mm. The formed charcoal on the sieve was regarded as sound products, and the formed charcoal under the sieve was regarded as powder, and the mass of each was measured. The "powdering rate" was calculated by dividing the mass of the powder by the total mass of the sound products and the powder. The results are shown in Table 1. The charged amount of the formed charcoal was 600 kg.

[0063]

Table 1

[0064] As shown in Table 1, in Comparative Examples 1 and 2 where no magnetic generating part was provided, the powdering rate was 14.8 to 15.4 mass%. On the other hand, in Examples 1 to 8 where a magnetic generating part was provided, the powdering rate was 2.2 to 3.5 mass%. From the above, it was confirmed that by providing a magnetic generating part in the connection part, the powdering rate decreases.

[0065] (Test Example 2: Powdering Rate Test) Using a test device that simulated the conveying device described in the above embodiment, the powdering rate of the brittle material and the amount of the brittle material adhering to the magnetic generating part were investigated. As the brittle material, formed charcoal was used.

[0066] As the conveying device, one in which a magnetic generating part was provided one by one on the wall part, the upper part of the inclined part, and the lower part of the inclined part was used. By changing the magnetic field strength generated by each magnetic generating part, the powdering rate of the formed charcoal and the amount of the formed charcoal adhering to each magnetic generating part were measured. The results are shown in FIG. 7. Also, in each of the examples and the comparative examples, a conveying device was configured using magnetic generating parts having the same magnetic field strength.

[0067] As shown in Fig. 7, until the magnetic field strength reaches 2000 Gauss, the pulverization rate of the formed charcoal rapidly decreases. In particular, when the magnetic field strength exceeds 1500 Gauss, the pulverization rate of the formed charcoal significantly decreases. Therefore, in order to achieve a lower pulverization rate, it is preferable that the magnetic field strength generated by each magnetic generation part is 1500 Gauss or more.

[0068] Also, when the magnetic field strength exceeds 8000 Gauss, the adhesion amount of the formed charcoal adhering to the magnetic generation part rapidly increases. When the adhesion amount of the formed charcoal rapidly increases, it tends to be difficult for the raw material accumulation to form a desired angle of repose. In addition, when the adhesion amount of the formed charcoal adhering to the magnetic generation part increases, there is also a possibility that the connection part may be blocked. Therefore, it is preferable that the magnetic field strength generated in each magnetic generation part is 8000 Gauss or less.

Description of symbols

[0069] 100 Conveyor 10 Feed port 20 Discharge port 30 Connection part 32 Wall part 33 Inclined part 50 Magnetic generation part

Claims

1. A conveying device having a supply port through which a magnetic brittle material is supplied, a discharge port through which the brittle material is discharged, and a connection portion that connects the supply port and the discharge port, The connection portion is a conveying device, the supply port side of the connection portion being located at a higher position than the discharge port side, and the conveying device has a magnetic generating portion that generates a magnetic field strength capable of holding the brittle material.

2. The conveying device according to claim 1 , wherein the brittle material having magnetic properties is a raw material for iron making.

3. 3. The conveying device according to claim 1, wherein the magnetic field generated by the magnetic field generating unit has a strength of 1500 Gauss or more.

4. The connection portion is formed in a cylindrical shape, 3. The conveying device according to claim 1, wherein the magnetic field generating unit is provided on a wall of the connection portion located in the supply direction of the brittle material and is arranged so as to generate the magnetic field strength along a circumferential direction of the wall portion.

5. The connection portion is formed in a cylindrical shape, The conveying device according to claim 1 or 2, wherein the magnetic generating units are provided in a plurality of positions along a height direction of the wall portion of the connection portion and are arranged so as to generate the magnetic field strength along a circumferential direction of the wall portion.

6. The connection portion is formed in a cylindrical shape and has an inclined portion formed so as to narrow downward in a height direction, the magnetic field generating unit is provided in a plurality of units along a height direction of the inclined portion and is arranged so as to generate the magnetic field intensity along a circumferential direction of the wall portion; The transport device according to claim 5 , wherein the magnetic field strength of the magnetic field generating unit arranged on the lower side is lower than the magnetic field strength of the magnetic field generating unit arranged on the higher side.

7. The magnetic field generating unit is an electromagnet, The transport device according to claim 1 , further comprising an adjustment unit that adjusts the intensity of the magnetic field generated by the magnetic field generation unit.

8. A conveying method using the conveying device according to claim 1 or 2, a supply step of supplying the brittle material from the supply port; an adjusting step of adjusting a moving speed of the brittle material by the magnetic generating unit; a discharge step of discharging the brittle material from the discharge port; The transport method comprises:

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