Belt conveyor chute device

Abstract

To provide a belt conveyor chute device that can reduce deviation of granular materials in the width direction of a vibrating screen.SOLUTION: A belt conveyor chute device is a device for conveying granular material from a belt conveyor to a vibrating screen. The belt conveyor chute device comprises: a box body that includes a supply port through which granular materials are supplied from the belt conveyor and a discharge port through which the granular materials are discharged toward a vibrating screen; a stepped part that is provided between the supply port and the discharge port inside the box body; a first distributing part that is provided inside the box body closer to the discharge port than the stepped part and configured to regulate a direction of movement of the granular materials; and a second distributing part that is provided inside the box body on the discharge port side with respect to the first distributing part and configured to regulate the moving direction of the granular materials.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a belt conveyor chute apparatus for conveying granular material from a belt conveyor to a vibrating screen. [Background technology]

[0002] The raw materials handled in steel mills include granular materials such as ore, coal, sintered ore, and coke. The granular materials are sieved into appropriate particle sizes using a vibrating screen and then used in various processes in steelmaking.

[0003] The granular material is transported by a belt conveyor and supplied to the vibrating screen via a belt conveyor chute. If the granular material is unevenly deposited on the vibrating screen, the vibrating screen may not be able to fully utilize its capabilities and may not be able to properly sieve the material. For this reason, it is preferable that the granular material be deposited on the vibrating screen at as uniform a thickness as possible.

[0004] The width of the belt conveyor chute is set to be equal to the width of the belt conveyor. In many cases, the widths of the belt conveyor and the vibrating screen are significantly different, with the width of the belt conveyor being narrower than the width of the vibrating screen. This causes the problem of particulate matter being unevenly deposited in the center of the width of the vibrating screen.

[0005] Conventionally, when conveying granular materials by a belt conveyor, attempts have been made to supply the granular materials uniformly across the width of the conveyance direction. For example, in Patent Document 1, an obstacle member is provided in a chute that transfers the granular materials from an upstream belt conveyor to a downstream belt conveyor to disperse the granular materials and convey them to the downstream conveyor. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-175479 Summary of the Invention [Problem to be solved by the invention]

[0007] In the belt conveyor chute of Patent Document 1, the supply port through which granular material is supplied to the chute and the discharge port through which the granular material is discharged are arranged vertically. Therefore, when the belt conveyor chute of Patent Document 1 is used to connect a belt conveyor and a vibrating screen, the granular material flows down at a high speed, which causes a problem that the granular material cannot be uniformly dispersed in the width direction of the vibrating screen.

[0008] The present invention has been made in consideration of the above-mentioned problems, and has as its object to provide a belt conveyor chute device that can reduce the uneven distribution of granular matter across the width of a vibrating screen. [Means for solving the problem]

[0009] In order to solve the above problems, the present invention has the following features.

[0010] [1] A belt conveyor chute device for conveying granular material from a belt conveyor to a vibrating screen, comprising: a box having a supply port through which the granular material is supplied from the belt conveyor and a discharge port through which the granular material is discharged toward the vibrating screen, The box body has a step portion formed in a stepped shape between the supply port and the discharge port; a first distributor that is provided closer to the discharge port than the step and that regulates the direction of movement of the granular material; a second distributor that is provided closer to the discharge outlet than the first distributor and that regulates the direction of movement of the granular material; [2] The belt conveyor chute device described in [1], wherein the first distribution section is located on an extension of the ridge line of the granular material when the granular material accumulated in the step section forms an angle of repose. [3] The belt conveyor chute device described in [1] or [2], wherein the second distribution section is located on an extension of the ridge line of the granular material when the granular material deposited in the first distribution section forms an angle of repose. [4] The second distribution portion is formed in a plate shape extending in a direction along the width direction of the discharge port, The belt conveyor chute device according to any one of [1] to [3], wherein the length of the second distribution section in the width direction of the discharge outlet is 60 to 95% of the width of the discharge outlet. [5] the step portion is provided on a wall portion of the box body opposite to a wall portion to which the belt conveyor is connected to the supply port, the first distribution section and the second distribution section are provided on the same wall section as the wall section on which the step section is provided, The belt conveyor chute device according to any one of [1] to [4], wherein the discharge outlet is provided in a wall portion that faces the wall portion on which the second distributor is provided. [Effects of the Invention]

[0011] According to the belt conveyor chute device of the present invention, granular material supplied from the supply port is deposited in the step portion. The granular material then flows downward along the granular material deposit formed in the step portion and is deposited in the first distribution portion. The granular material then flows downward along the granular material deposit formed in the first distribution portion and is deposited in the second distribution portion. The granular material then flows downward along the granular material deposit formed in the second distribution portion and is discharged from the discharge port.

[0012] The granular material flows down along the deposits formed in the step section, the first distribution section, and the second distribution section, and therefore its flow speed decreases. Therefore, the granular material can be efficiently distributed in the first distribution section and the second distribution section, and the uneven distribution of the granular material across the width of the vibrating screen can be reduced. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 2 is a perspective view of the belt conveyor chute device. [Figure 2] FIG. 2 is an explanatory diagram showing the internal structure of the box of FIG. [Figure 3] FIG. 2 is a cross-sectional view of the upper side of the box body of FIG. [Figure 4] 2 is a cross-sectional view of the lower side of the box body of FIG. 1. [Figure 5] FIG. 10 is an explanatory diagram showing the flow of granular material supplied to the box. [Figure 6] FIG. 10 is an explanatory diagram showing the internal structure of the box according to the second embodiment. [Figure 7] FIG. 10 is an explanatory diagram showing the internal structure of a box according to a modified example of the second embodiment. [Figure 8] 1 is a graph showing a quantitative analysis of particulate matter in the width direction of a vibrating screen. DETAILED DESCRIPTION OF THE INVENTION

[0014] (First embodiment) An embodiment of the present invention will now be described with reference to the drawings. Fig. 1 is a perspective view of a belt conveyor chute device 100. As shown in Fig. 1, the belt conveyor chute device 100 has a box-shaped box body 10. Connected to the box body 10 are a belt conveyor 20 that transports granular material and a vibrating screen 30 that classifies the granular material into desired particle sizes.

[0015] The belt conveyor 20 has a pair of pulleys 21 provided at one end and the other end in the conveying direction, and a circular belt 22 stretched over the pair of pulleys 21. Therefore, when the pulleys 21 are operated, the belt 22 moves in the conveying direction.

[0016] The granular materials transported from the belt conveyor 20 are not particularly limited, but examples include ore, coal, sintered ore, coke, silica, pellets (ore made by adding water and a binder to form a spherical shape and then baking it to harden it), etc.

[0017] The vibrating screen 30 is a sieving device that classifies granular materials by vibrating a first sieve 31 and a second sieve (not shown) that is disposed below the first sieve and has finer mesh than the first sieve. The granular materials discharged from the belt conveyor chute device 100 are classified by the vibrating screen 30.

[0018] The box 10 has a rectangular parallelepiped shape at the top and a truncated cone shape at the bottom. The box 10 has a space surrounded by an inner wall. A supply port 11 through which granular material is supplied from a belt conveyor 20 is formed at the top of the box 10.

[0019] In this embodiment, the supply port 11 is provided in the wall 13 of the box body 10. In this embodiment, a pulley 21 of the belt conveyor 20 is inserted through the supply port 11. Therefore, the granular material conveyed from the belt conveyor 20 is supplied into the inside of the box body 10 through the supply port 11.

[0020] A discharge port 12 is formed below the box body 10 to discharge the supplied granular material toward the vibrating screen 30. In this embodiment, the discharge port 12 is provided in a wall portion 13 of the box body 10. That is, the supply port 11 and the discharge port 12 are formed in the wall portion 13 to which the belt conveyor 20 is connected.

[0021] A stepped portion 14 formed in a staircase shape is provided between the supply port 11 and the discharge port 12 of the box body 10. The position where the stepped portion 14 is provided is not particularly limited, but in this embodiment, it is provided on a wall portion 15 opposite to a wall portion 13 to which the belt conveyor 20 is connected to the supply port 11. The granular material supplied from the belt conveyor 20 is deposited on the stepped portion 14.

[0022] Fig. 2 shows the internal structure of the box 10 of Fig. 1. As shown in Fig. 2, a wall portion 15a extending downward from the step portion 14 is formed at an acute angle with respect to the step portion 14. In this embodiment, the wall portion 15a is formed so as to form an L-shape with respect to the step portion 14 in a side view. The wall portion 15 has a wall portion 15b extending downward from the wall portion 15a. The wall portion 15b is formed so as to form an obtuse angle with respect to the wall portion 15a. The width of the wall portion 15b increases downward.

[0023] Box 10 has a first distribution section 16 that is provided closer to outlet 12 than step section 14. More specifically, first distribution section 16 is provided on wall section 15a that continues downward from step section 14.

[0024] The first distribution section 16 is formed in a plate shape extending along the width direction of the outlet 12. In this embodiment, the first distribution section 16 is attached in a direction perpendicular to the wall surface of the wall section 15a. The first distribution section 16 may be detachably attached to the wall section 15a by fastening means (not shown) such as bolts, for example.

[0025] The box 10 has a second distribution section 17 that is provided closer to the outlet 12 side than the first distribution section 16. More specifically, the second distribution section 17 is provided on a wall section 15b that continues downward from the wall section 15a.

[0026] The second distribution section 17 is formed in the shape of a plate extending along the width direction of the discharge outlet 12. The length of the second distribution section 17 along the width direction of the discharge outlet 12 is preferably 60 to 95% of the width of the discharge outlet 12. By making the length 60% or more of the width of the discharge outlet 12, the movement direction of the granular material can be efficiently restricted. Furthermore, by making the length 95% or less of the width of the discharge outlet 12, the movement of the granular material can be efficiently carried out.

[0027] In this embodiment, the second distribution unit 17 is attached in a direction perpendicular to the wall surface of the wall unit 15b. The second distribution unit 17 may be detachably attached to the wall unit 15b by fastening means (not shown) such as bolts.

[0028] Fig. 3 shows a cross section of the upper side of the box body 10. As shown in Fig. 3, when granular material 40 is supplied to the box body 10 from the belt conveyor 20, the granular material 40 is piled up at the step portion 14. When the granular material 40 is piled up at the step portion 14, a pile having an angle of repose θ1 is formed.

[0029] The angle of repose θ1 of the granular material 40 varies depending on the type of granular material 40. For example, if the granular material 40 is sintered ore, the angle of repose θ1 is 30 to 50 degrees. If the granular material 40 is silica, the angle of repose θ1 is 20 to 25 degrees.

[0030] The first distribution section 16 is located on an extension of the ridge line L1 of the granular material 40 (sediment) accumulated on the step section 14. The newly supplied granular material 40 flows down along the ridge line L1 of the granular material 40 (sediment) accumulated on the step section 14. The granular material 40 that flows down along the ridge line L1 is deposited in the first distribution section 16. When the granular material 40 is deposited in the first distribution section 16, an angle of repose θ1 is formed.

[0031] In this way, the first distribution section 16 is located on an extension of the ridge line L1 of the granular material 40 (deposit) when the granular material 40 deposited on the step section 14 forms an angle of repose θ1. In this embodiment, the end of the first distribution section 16 is located on an extension of the ridge line L1 of the granular material 40 (deposit).

[0032] The first distributor 16 is preferably provided so that its height position and widthwise position in the box 10 can be adjusted so that it is located on an extension of the ridge line L1 of the granular material 40 (deposit) when the granular material 40 deposited on the step portion 14 forms an angle of repose θ1. For example, the first distributor 16 is preferably provided so that its fixed position can be changed by a bolt.

[0033] Fig. 4 shows a cross section of the lower side of the box 10. As shown in Fig. 4, granular material 40 is piled up in the step portion 14, forming a pile having an angle of repose θ1. Similarly, granular material 40 is piled up in the first distribution portion 16, forming a pile having an angle of repose θ1.

[0034] The newly supplied granular material 40 flows down along the ridge line L2 of the granular material 40 (deposit) deposited in the first distribution section 16. The granular material 40 that flows down along the ridge line L2 deposits in the second distribution section 17. When the granular material 40 deposits in the second distribution section 17, a deposit having an angle of repose θ1 is formed.

[0035] In this way, the second distribution section 17 is located on an extension of the ridge line L2 of the granular material 40 (deposit) when the granular material 40 deposited in the first distribution section 16 forms an angle of repose. In this embodiment, the end of the second distribution section 17 is located on an extension of the ridge line L2 of the granular material 40 (deposit).

[0036] The second distribution section 17 is preferably provided so that its height position and width position in the box 10 can be adjusted so that it is located on an extension of the ridge line L2 of the granular material 40 (deposit) when the granular material 40 deposited in the first distribution section 16 forms an angle of repose θ1. For example, the second distribution section 17 is preferably provided so that its fixing position with a bolt can be changed.

[0037] Fig. 5 shows the flow of granular material 40 supplied to box 10. As shown in Fig. 5, granular material 40 supplied from supply port 11 is deposited in step portion 14, first distribution section 16, and second distribution section 17. Newly supplied granular material 40 flows down along ridge lines L1 and L2 of granular material 40 (deposit) deposited in step portion 14, first distribution section 16, and second distribution section 17. In other words, the newly supplied granular material 40 is discharged from discharge port 12 with its direction of movement restricted by granular material 40 deposited in step portion 14, first distribution section 16, and second distribution section 17.

[0038] The flow speed of the granular material 40 decreases as it flows down along the deposits formed in the step portion 14, the first distribution portion 16, and the second distribution portion 17. In particular, since the step portion 14 is provided on the wall portion 15 opposite the wall portion 13 in which the supply port 11 is formed, the flow speed of the granular material 40 can be reduced by the step portion 14 or the deposit of the granular material 40 accumulated in the step portion 14.

[0039] Furthermore, since the first distribution section 16 is provided on the same wall section 15 as the wall section 15 on which the step section 14 is provided, the flow-down speed of the granular material 40 can be reduced by the first distribution section 16 or the deposit of granular material 40 deposited on the first distribution section 16. Similarly, since the second distribution section 17 is provided on the same wall section 15 as the wall section 15 on which the step section 14 is provided, the flow-down speed of the granular material 40 can be reduced.

[0040] Furthermore, since the discharge outlet 12 is provided on the wall 13 opposite the wall 15 on which the second distribution section 17 is provided, the granular material 40 whose flow rate has been sufficiently reduced can be discharged from the discharge outlet 12 in a state where it is dispersed in the width direction of the vibrating screen 30.

[0041] In this way, according to the belt conveyor chute device 100 of this embodiment, the granular material 40 is distributed by the first distribution section 16 and the second distribution section 17, making it possible to reduce the bias of the granular material 40 in the width direction of the vibrating screen 30.

[0042] (Second embodiment) In the above-described embodiment, an example has been described in which the second distribution section 17 is formed in the shape of a single plate. A plurality of second distribution sections 17 may be formed. Note that the same members as those in the first embodiment are denoted by the same reference numerals and descriptions thereof will be omitted.

[0043] Fig. 6 is an explanatory diagram showing the internal structure of the box 10 according to the second embodiment. As shown in Fig. 6, the second distribution section 18 is composed of two upper stage sections 18a arranged in the width direction of the wall section 15b and a lower stage section 18b provided below the upper stage sections 18a.

[0044] The two upper tiers 18a are spaced apart in the width direction of the wall 15b. In the example shown in Fig. 6, the lower tier 18b is provided between the two upper tiers 18a. Therefore, the granular material 40 that flows down from between the two upper tiers 18a is deposited in the lower tier 18b. The lower tier 18b is preferably provided so that its height position and width direction position in the box 10 can be adjusted so that it is located on an extension of the ridge line L2 of the granular material 40 (deposit) when the granular material 40 deposited on the upper tier 18a forms an angle of repose θ1.

[0045] Even when the second distributor 18 is configured in this manner, the granular material 40 is distributed by the first distributor 16 and the second distributor 17, similar to the belt conveyor chute device 100 of the first embodiment. This makes it possible to reduce the uneven distribution of the granular material 40 across the width of the vibrating screen 30.

[0046] Note that the second distribution section 18 is not limited to this configuration, and may be configured, for example, with multiple lower tiers 18b. FIG. 7 is an explanatory diagram showing the internal structure of the box 10 according to a modified example of the second embodiment. As shown in FIG. 7, the lower tier 18b is provided outside the two upper tiers 18a in the width direction of the wall 15. Therefore, the granular material 40 that flows down from the outside of the two upper tiers 18a is deposited in the lower tier 18b. Even when the second distribution section 18 is configured in this manner, the same effects as those of the above-described embodiment can be obtained. Furthermore, the second distribution section 18 is not limited to being configured with two tiers, the upper tier 18a and the lower tier 18b, and may be configured with three or more tiers. [Example]

[0047] The dispersion of granular materials on a vibrating screen was evaluated using the belt conveyor chute device shown in Figures 2, 6, and 7. Quantitative analysis was performed using the Distinct Element Method (DEM) to evaluate the dispersion of granular materials. The specifications of the belt conveyor and the physical properties of the transported raw materials were taken into consideration during the quantitative analysis.

[0048] The analysis results are shown in Figure 8. In Figure 8, the belt conveyor chute device in Figure 7 is designated as Example 1, the belt conveyor chute device in Figure 6 is designated as Example 2, and the belt conveyor chute device in Figure 2 is designated as Example 3.

[0049] For Examples 1 to 3, the length of the first distribution section along the width direction of the discharge port was determined based on the angle of repose of the granular material and the expected thickness (layer thickness) of the granular material deposit. Specifically, the angle of repose of the granular material was set to 36°. The length of the first distribution section along the width direction of the discharge port was set to 400 mm.

[0050] The height from the first distribution section to the step was 290 mm, calculated based on the length of the first distribution section along the width direction of the outlet (400 mm) × tan (angle of repose: 36°).

[0051] In Example 1 shown in Figure 7, the location of the upper part of the second distribution section was determined based on the angle of repose of the granular material accumulated in the first distribution section. The location of the lower part of the second distribution section was determined based on the angle of repose of the granular material accumulated in the upper part of the second distribution section.

[0052] In Example 2 of the invention shown in Fig. 6, the arrangement of the upper part of the second distribution section was determined in the same manner as in Example 1. The arrangement of the lower part of the second distribution section was determined so as to be located at the center of the outlet in the width direction.

[0053] In Example 3 of the invention shown in Fig. 2, the arrangement of the upper part of the second distribution section was determined in the same manner as in Example 1 of the invention. However, in Example 3 of the invention, a second distribution section formed in a single plate shape was used so that the upper parts of the two second distribution sections of Example 1 were connected.

[0054] Boxes for measuring the amount of granular material were arranged in the width direction of the vibrating screen, and the mass % of the granular material flowing into each box was measured. The results are shown in Figure 8. The box placed at one end of the width direction of the vibrating screen was designated No. 1, the box placed at the other end was designated No. 20, and boxes No. 2 to No. 19 were placed at predetermined intervals between No. 1 to No. 20. In Figure 8, the box numbers are shown on the horizontal axis, and the mass % of the granular material is shown on the vertical axis.

[0055] The gray area in Figure 8 indicates the range of the box into which the granular material flows when using a conventional belt conveyor chute device that does not have a first distribution section or a second distribution section. In other words, in the conventional example, most of the granular material is concentrated in the central area on the vibrating screen.

[0056] The belt conveyor chute devices of Examples 1 to 3 can supply granular material more uniformly across the width of the vibrating screen than the conventional example. In Example 1, it can be seen that the granular material is concentrated in the center of the vibrating screen. In Example 2, the dispersion of the granular material is improved compared to Example 1, but the amount supplied to the center of the vibrating screen is reduced. In Example 3, it was found that the dispersion of the granular material is the best compared to Examples 1 and 2. This is because forming the upper section of the second distribution section into a plate shape disperses the granular material flowing downstream of the upper section of the second distribution section. By arranging the first distribution section and the second distribution section as in Example 3, the amount of granular material supplied across the width of the vibrating screen can be made more uniform than in Examples 1 and 2. [Explanation of symbols]

[0057] 100 Belt conveyor chute device 10 box body 11 Supply port 12 Outlet 13 Wall 14 Step 15 Wall 16 First distribution section 17 Second Distribution Section 18 Second Distribution Section

Claims

1. A belt conveyor chute device for conveying granular material from a belt conveyor to a vibrating screen, comprising: a box having a supply port through which the granular material is supplied from the belt conveyor and a discharge port through which the granular material is discharged toward the vibrating screen, The box body has a step portion formed in a stepped shape between the supply port and the discharge port; a first distributor that is provided closer to the discharge port than the step and that regulates the direction of movement of the granular material; a second distributor that is provided closer to the discharge port than the first distributor and that regulates the direction of movement of the granular material; The second distribution portion is formed in a plate shape extending in a direction along the width direction of the discharge port, A belt conveyor chute device, wherein the length of the second distribution section in the width direction of the discharge outlet is 60 to 95% of the width of the discharge outlet.

2. 2. The belt conveyor chute device according to claim 1, wherein the first distribution section is located on an extension of a ridge line of the granular material when the granular material deposited on the step section forms an angle of repose.

3. 3. The belt conveyor chute device according to claim 1, wherein the second distribution section is located on an extension of a ridge line of the granular material when the granular material deposited in the first distribution section forms an angle of repose.

4. the step portion is provided on a wall portion of the box body opposite to a wall portion to which the belt conveyor is connected to the supply port, the first distribution section and the second distribution section are provided on the same wall section as the wall section on which the step section is provided, The belt conveyor chute device according to claim 1 or 2, wherein the discharge port is provided in a wall portion opposite to the wall portion on which the second distributor is provided.

5. the step portion is provided on a wall portion of the box body opposite to a wall portion to which the belt conveyor is connected to the supply port, the first distribution section and the second distribution section are provided on the same wall section as the wall section on which the step section is provided, The belt conveyor chute device according to claim 3 , wherein the discharge port is provided in a wall portion opposite to the wall portion on which the second distributor is provided.

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