Stored raw-material feeder

Abstract

To provide a stored raw-material feeder allowed to reduce the vertical powder pressure at an upper surface of a conveyance installation as caused by the weight of a raw material stored in a hopper.SOLUTION: A stored raw-material feeder 2 comprises a stored raw-material feeder body 3 that is disposed below a hopper 1 storing a raw material S and feeds the raw material S stored in the hopper 1 from the hopper 1 onto a conveyance installation 4. The stored raw-material feeder body 3 is constructed inclining relatively to an upper surface 4a of the conveyance installation 4 with a feeder center line CL3 connecting between a center C3 in a raw-material transport direction by the conveyance installation 4 at a raw material inlet 3A of the stored raw-material feeder body 3 and a center C4 in the raw-material transport direction at a raw material outlet 3B of the stored raw-material feeder body 3 inclined relatively to a hopper center line CL1 connecting between a center C1 in the raw-material transport direction at a raw-material inlet 1A of the hopper 1 and a center C2 in the raw-material transport direction at a raw-material outlet 1B of the hopper 1.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a stored raw material supply device that is disposed below a hopper and sends raw materials stored in the hopper from the hopper to a conveying facility. [Background technology]

[0002] The raw materials handled in steelworks include ore, coal, sintered ore, coke, etc. These raw materials are generally stored in hoppers. The raw materials stored in the hoppers are then sent to a conveying facility such as a belt conveyor by a raw material supplying device disposed below the hopper, and are then transported to a blast furnace or the like by the conveying facility. Here, tens to hundreds of tons of raw material are stored in the hopper, and the weight of the stored raw material generates a large vertical powder pressure (bottom pressure) on the top surface of the conveying equipment such as a belt conveyor.

[0003] However, at present, the method for calculating this powder pressure has not been clearly defined, and unless an appropriate design is implemented taking into account the powder pressure of the storage material supply device located below the hopper, this powder pressure will cause excessive load, resulting in a problem in that transportation equipment such as belt conveyors will not be able to start due to insufficient power.

[0004] In response to this, for example, a powder quantitative feed device as shown in Patent Document 1 has been proposed. The powder quantitative dispensing device shown in Patent Document 1 is a device that quantitatively dispenses powder from a storage bin using a chain conveyor, and has a plate-shaped primary damper installed between the outlet of the storage bin and a box-shaped damper. According to the powder quantitative dispensing device disclosed in Patent Document 1, the bulk density and layer thickness of the powder on the dispensing conveyor can be stabilized, and the accuracy of the amount of powder supplied can be improved. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 8-40537 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the conventional powder quantitative feed device disclosed in Patent Document 1 has the following problems.

[0007] That is, the powder quantitative dispensing device shown in Patent Document 1 simply dispenses powder quantitatively from a storage bin using a chain conveyor, but is not designed to take into account the vertical powder pressure on the upper surface of the chain conveyor due to the mass of powder that accompanies storage, and therefore, when large vertical powder pressure is generated on the upper surface of the chain conveyor, the powder cannot be dispensed from the storage bin using the chain conveyor.In other words, when large vertical powder pressure is generated on the upper surface of the chain conveyor, the chain conveyor cannot be started due to insufficient power.

[0008] Therefore, the present invention has been made to solve this conventional problem, and its object is to provide a stored raw material supply device that can reduce the vertical powder pressure on the top surface of the conveying equipment caused by the weight of the raw material stored in the hopper. [Means for solving the problem]

[0009] In order to solve the above problems, one aspect of the present invention provides a stored raw material supplying device that is disposed below a hopper that stores raw materials and has a stored raw material supplying device main body that sends the raw materials stored in the hopper from the hopper to a conveying facility, and the stored raw material supplying device main body is configured such that the supplying device center line connecting the center of the raw material inlet of the stored raw material supplying device main body in the raw material conveying direction by the conveying facility and the center of the raw material discharge outlet of the stored raw material supplying device main body in the raw material conveying direction is inclined relative to the hopper center line connecting the center of the raw material inlet of the hopper in the raw material conveying direction and the center of the raw material discharge outlet of the hopper in the raw material conveying direction, and is inclined relative to the top surface of the conveying facility. [Effects of the Invention]

[0010] According to the stored raw material supply device of the present invention, it is possible to provide a stored raw material supply device that can reduce the vertical powder pressure on the upper surface of the conveying equipment that is generated by the weight of the raw material stored in the hopper. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a right side view showing a storage raw material supply device according to a first embodiment of the present invention together with a hopper and a belt conveyor. [Figure 2] FIG. 2 is a front view of FIG. [Figure 3] 2 is an enlarged cross-sectional view of the stored raw material supply device according to the first embodiment of the present invention shown in FIG. 1. However, raw materials are not shown in FIG. [Figure 4] FIG. 10 is a right side view showing a stored raw material supply device according to a second embodiment of the present invention together with a hopper and a belt conveyor. [Figure 5] FIG. 5 is a front view of FIG. [Figure 6] 6 is an enlarged cross-sectional view showing the stored raw material supply device according to the second embodiment in FIG. 4. However, raw materials are not shown in FIG. [Figure 7] FIG. 2 is a right side view showing the storage raw material supply device according to Comparative Example 1 together with a hopper and a belt conveyor. [Figure 8] FIG. 8 is a front view of FIG. [Figure 9] FIG. 10 is a right side view showing the stored raw material supply device according to Comparative Example 2 together with a hopper and a belt conveyor. [Figure 10] 1 is a graph showing the load power generated on the belt conveyor when raw materials are sent from a hopper onto the belt conveyor using the stored raw material supply devices of Example 1 of the present invention, Example 2 of the present invention, Comparative Example 1, and Comparative Example 2, and the belt conveyor is driven to transport the raw materials. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments shown below are examples of devices and methods for embodying the technical concept of the present invention, and the technical concept of the present invention is not limited to the following embodiments in terms of the materials, shapes, structures, arrangements, etc. of the components.

[0013] In addition, the drawings are schematic, and therefore it should be noted that the relationship between thickness and planar dimensions, ratios, etc. may differ from the actual relationship, and the drawings may also contain parts where the relationship and ratio of dimensions differ from each other.

[0014] (First embodiment) FIG. 1 shows a storage material supplying device according to a first embodiment of the present invention, together with a hopper and a belt conveyor. In Figure 1, raw material S is stored in hopper 1. Raw material S is granular material such as ore, coal, sintered ore, or coke. Hopper 1 is an inverted cone-shaped storage container having a large-diameter raw material inlet 1A at the top that opens upward and a small-diameter raw material outlet 1B at the bottom that opens downward.

[0015] Below the hopper 1, there is disposed a stored raw material supply device 2 having a stored raw material supply device main body 3 that sends out the raw materials S stored in the hopper 1 from the hopper 1 onto a belt conveyor 4 serving as a transport facility. The raw materials S stored in the hopper 1 are sent onto the belt conveyor 4 by the stored raw material supply device 2 disposed below the hopper 1, and are transported by the belt conveyor 4 in the raw material transport direction (from back to front) indicated by arrow X towards a blast furnace or the like.

[0016] Here, the weight of the raw material S stored in the hopper 1 is several tens to several hundreds of tons, and the weight of the raw material S stored in the hopper 1 generates a large vertical powder pressure (bottom pressure) on the upper surface 4a of the belt conveyor 4.

[0017] Therefore, in the stored raw material supply device 2 of this embodiment, the structure of the stored raw material supply device main body 3 and the method of attachment to the bottom of the hopper 1 are devised to reduce the vertical powder pressure on the upper surface 4a of the belt conveyor 4 caused by the weight of the raw material S stored in the hopper 1.

[0018] The stored raw material supply device main body 3 of the stored raw material supply device 2 is connected to the bottom of the hopper 1 so that the raw material discharge port 1B of the hopper 1 and the raw material inlet 3A (see Figure 3) of the stored raw material supply device main body 3 are continuous. The stored raw material supply device main body 3 is configured so that the supply device center line CL3 connecting the center C3 of the raw material conveying direction of the raw material inlet 3A of the stored raw material supply device main body 3 and the center C4 of the raw material conveying direction of the raw material discharge port 3B (see Figure 3) of the stored raw material supply device main body 3 is inclined with respect to the hopper center line CL1 connecting the center C1 of the raw material conveying direction of the raw material inlet 1A of the hopper 1 and the center C2 of the raw material conveying direction of the raw material discharge port 1B of the hopper 1, and is also inclined with respect to the upper surface 4a of the belt conveyor 4.

[0019] Specifically, as shown in Figures 1 to 3, the storage raw material supply device main body 3 is a rectangular cylinder having a front wall 3a located downstream in the raw material conveying direction, a rear wall 3b located upstream in the raw material conveying direction, a left side wall 3c, and a right side wall 3d, and a raw material inlet 3A opening upward is formed at the top of the rectangular cylinder, and a raw material outlet 3B opening downward is formed at the bottom of the rectangular cylinder.

[0020] The supply device center line CL3, which connects the center C3 of the raw material inlet 3A of the stored raw material supply device main body 3 in the raw material conveying direction with the center C4 of the raw material discharge outlet 3B of the stored raw material supply device main body 3 in the raw material conveying direction, and the upper surface 4a of the belt conveyor 4, is located downstream of the intersection P1 of the hopper center line CL1, which connects the center C1 of the raw material inlet 1A of the hopper 1 in the raw material conveying direction with the center C2 of the raw material discharge outlet 1B of the hopper 1 in the raw material conveying direction, and the upper surface 4a of the belt conveyor 4. The supply device center line CL3 is inclined downward from the upstream side to the downstream side with respect to the hopper center line CL1. The inclination angle of the supply device center line CL3 with respect to the hopper center line CL1 is θ1. As shown in FIG. 3, the front wall 3a and rear wall 3b of the stored raw material supply device main body 3 are inclined downward from the upstream side to the downstream side in the raw material conveying direction, parallel to the supply device center line CL3. As a result, the rear wall 3b on the upstream side in the raw material conveying direction of the storage raw material supply device main body 3 is inclined downward from the upstream side to the downstream side relative to the upper surface 4a of the belt conveyor 4. The inclination angle of the rear wall 3b relative to the upper surface 4a of the belt conveyor 4 is θ2.

[0021] As shown in FIG. 2, the left side wall 3c and the right side wall 3d of the storage raw material supply device main body 3 are made up of inclined plates that are inclined so that the distance between them gradually narrows from top to bottom.

[0022] Here, powder theory states that when raw material (powder) is stored in a hopper, once a certain raw material storage height is reached, the force (powder force) acting on the bottom surface of the hopper will not increase but will converge, no matter how much more raw material is added to the hopper. Based on this theory, the vertical powder pressure acting on the bottom surface of the hopper 1 (top surface 4a of the belt conveyor 4) is greatly affected by the shape (inclination angle and opening area of ​​the raw material discharge port) of the stored raw material supply device 2 located below the hopper 1. Therefore, determining the inclination angle θ2 of the rear wall 3b of the stored raw material supply device main body 3 relative to the top surface 4a of the belt conveyor 4 and the opening area of ​​the raw material discharge port 3B of the stored raw material supply device main body 3 is extremely important.

[0023] By configuring the stored raw material supply device main body 3 in such a structure that the supply device center line CL3 is inclined at an inclination angle θ1 with respect to the hopper center line CL1 and the rear wall 3b is inclined at an inclination angle θ2 with respect to the upper surface 4a of the belt conveyor 4, the raw material S introduced into the stored raw material supply device main body 3 from the hopper 1 is sent out onto the upper surface 4a of the belt conveyor 4 via the inclined rear wall 3b. This makes it possible to reduce the vertical powder pressure on the upper surface 4a of the belt conveyor 4 that is generated by the weight of the raw material S stored in the hopper 1.

[0024] Furthermore, the rear wall 3b on the upstream side of the raw material conveying direction of the storage raw material supply device main body 3 is inclined downward from the upstream side to the downstream side in the raw material conveying direction relative to the upper surface 4a of the belt conveyor 4, thereby improving the fluidity of the raw material S in the raw material conveying direction and further reducing the vertical powder pressure on the upper surface of the belt conveyor 4.

[0025] When raw material S is introduced from the hopper 1 into the main body 3 of the storage raw material supply device, the raw material S is also introduced into a predetermined area below the front wall 3a on the downstream side of the main body 3 of the storage raw material supply device. However, since this predetermined area below the front wall 3a is an area that is less likely to be subjected to the vertical load of the raw material S, it does not contribute much to increasing the vertical powder pressure on the upper surface of the belt conveyor 4.

[0026] The inclination angle θ2 of the rear wall 3b of the main body 3 of the stored raw material supply device relative to the upper surface 4a of the belt conveyor 4 is preferably 60° to 89°. If the inclination angle θ2 is less than 60°, the raw material S may become clogged or stuck on the rear wall 3b due to the properties of the raw material S. On the other hand, if the inclination angle θ2 is set to 90°, it is not possible to reduce the powder pressure in the vertical direction on the upper surface of the belt conveyor 4. In this embodiment, the inclination angle θ2 of the rear wall 3b of the main body 3 of the stored raw material supply device relative to the upper surface 4a of the belt conveyor 4 is approximately 70°.

[0027] In addition, the upper limit of the opening area of ​​the raw material discharge port 3B of the storage raw material supply device main body 3 is 1 m because the raw material S is granular material such as ore, coal, sintered ore, coke, etc. 2 The larger the opening area of ​​the raw material discharge port 3B, the more the powder pressure in the vertical direction applied to the belt conveyor 4 increases. 2 If it is larger than this, the vertical powder pressure applied to the belt conveyor 4 becomes too large, and the load on the motor when the belt conveyor 4 feeds the raw material S from the hopper 1 increases. If the rated power of the motor is increased to deal with this when the belt conveyor 4 feeds the raw material S from the hopper 1, the breaking strength of the belt may be exceeded. For this reason, the upper limit of the opening area of ​​the raw material discharge port 3B of the storage raw material supply device main body 3 is set to 1 m when the raw material S is granular material such as ore, coal, sintered ore, or coke. 2 It is preferable that:

[0028] In addition, since a steel conveyor called a pan conveyor can feed the raw material S with a large power, the opening area of ​​the raw material discharge port 3B is set to 1 m 2 There's no problem with making it bigger.

[0029] Furthermore, it is preferable that the dimension B1 in the raw material transport direction of the raw material discharge port 3B of the stored raw material supply device main body 3 is equal to or smaller than the dimension A1 in the raw material transport direction of the raw material inlet 3A of the stored raw material supply device main body 3. By making the dimension B1 in the raw material transport direction of the raw material discharge port 3B equal to or smaller than the dimension A1 in the raw material transport direction of the raw material inlet 3A, the opening area of ​​the raw material discharge port 3B can be reduced. In this embodiment, the dimension B1 in the raw material transport direction of the raw material discharge port 3B is equal to the dimension A1 in the raw material transport direction of the raw material inlet 3A.

[0030] Furthermore, there are no particular restrictions on the height H1 of the storage raw material supply device main body 3 according to the Jansen equation of powder theory, and it can be determined based on the relative positions of the hopper 1 and the belt conveyor 4, and when configured to a typical height, it is approximately 1 to 2 meters.

[0031] Thus, according to the stored raw material supply device 2 of the first embodiment, the stored raw material supply device main body 3 is configured so that the supply device center line CL3 connecting the center C3 of the raw material inlet 3A of the stored raw material supply device main body 3 in the raw material conveying direction and the center C4 of the raw material discharge outlet 3B of the stored raw material supply device main body 3 in the raw material conveying direction is inclined relative to the hopper center line CL1 connecting the center C1 of the raw material inlet 1A of the hopper 1 in the raw material conveying direction and the center C2 of the raw material discharge outlet 1B of the hopper 1 in the raw material conveying direction, and is inclined relative to the upper surface 4a of the belt conveyor 4 as a conveying equipment.

[0032] As a result, the raw material S introduced from the hopper 1 into the main body 3 of the stored raw material supply device is sent out onto the upper surface 4a of the belt conveyor 4 via the inclined wall portion of the main body 3 of the stored raw material supply device, thereby reducing the vertical powder pressure on the upper surface 4a of the belt conveyor 4 caused by the weight of the raw material S stored in the hopper 1.

[0033] Furthermore, according to the stored raw material supplying device 2 of the first embodiment, the stored raw material supplying device main body 3 is configured so that the supplying device center line CL13 is inclined relative to the hopper center line CL1 so that the intersection P3 between the supplying device center line CL3 and the upper surface 4a of the belt conveyor 4 as a conveying equipment is downstream in the raw material conveying direction of the intersection P1 between the hopper center line CL1 and the upper surface of the belt conveyor 4, and the rear wall 3b on the upstream side of the stored raw material supplying device main body 3 in the raw material conveying direction is inclined so as to descend from the upstream side to the downstream side relative to the upper surface 4a of the belt conveyor 4.

[0034] As a result, the raw material S introduced from the hopper 1 into the main body 3 of the stored raw material supply device is sent out onto the upper surface 4a of the belt conveyor 4 via the inclined rear wall 3b of the main body 3 of the stored raw material supply device, thereby reducing the vertical powder pressure on the upper surface 4a of the belt conveyor 4 caused by the weight of the raw material S stored in the hopper 1.In addition, since the rear wall 3b that receives the raw material S is inclined so as to slope downward from the upstream side to the downstream side relative to the upper surface 4a of the belt conveyor 4, the fluidity of the raw material S from the upstream side to the downstream side in the raw material conveying direction is improved, and the vertical powder pressure on the upper surface 4a of the belt conveyor 4 can be further reduced.

[0035] Furthermore, according to the stored raw material supplying device 2 of the first embodiment, the inclination angle θ2 of the rear wall 3b on the upstream side in the raw material conveying direction of the stored raw material supplying device main body 3 relative to the upper surface 4a of the belt conveyor 4 is 60° to 89°.

[0036] This makes it possible to reduce the powder pressure in the vertical direction on the upper surface 4a of the belt conveyor 4 while avoiding the possibility that the raw material S will clog or become stuck on the rear wall 3b due to the properties of the raw material S.

[0037] Furthermore, according to the stored raw material supply device 2 of the first embodiment, the conveying equipment is a belt conveyor 4, the raw material S is a granular material, and the upper limit of the opening area of ​​the raw material discharge port 3B of the stored raw material supply device main body 3 is 1 m 2 is.

[0038] As a result, when the raw material S is granular, the powder pressure in the vertical direction applied to the belt conveyor 4 can be suppressed, and the raw material S can be accurately fed from the hopper 1 using a general belt conveyor 4.

[0039] Furthermore, according to the stored raw material supply device 2 of the first embodiment, the dimension B1 in the raw material conveying direction of the raw material discharge outlet 3B of the stored raw material supply device main body 3 is less than or equal to the dimension A1 in the raw material conveying direction of the raw material inlet 3A of the stored raw material supply device main body 3.

[0040] This reduces the opening area of ​​the raw material discharge port 3B, and the powder pressure in the vertical direction on the upper surface 4a of the belt conveyor 4 can be reduced.

[0041] (Second embodiment) Next, a stored raw material supplying device according to a second embodiment of the present invention will be described with reference to Figures 4 to 6. Figure 4 is a right side view showing the stored raw material supplying device according to the second embodiment of the present invention together with a hopper and a belt conveyor. Figure 5 is a front view of Figure 4. Figure 6 is an enlarged cross-sectional view showing the stored raw material supplying device according to the second embodiment in Figure 4. In Figures 4 to 6, the same components as those shown in Figures 1 to 3 are designated by the same reference numerals, and their description may be omitted.

[0042] The stored raw material supplying device 2 according to the second embodiment shown in Figures 4 to 6 has the same basic configuration as the stored raw material supplying device 2 according to the first embodiment shown in Figures 1 to 3, but the inclination direction of the stored raw material supplying device main body 13 is different from the inclination direction of the stored raw material supplying device main body 3 of the stored raw material supplying device 2 according to the first embodiment.

[0043] That is, like the stored raw material supply device main body 3, the stored raw material supply device main body 13 is connected to the bottom of the hopper 1 so that raw material discharge port 1B of the hopper 1 and raw material inlet 13A (see Figure 6) of the stored raw material supply device main body 13 are continuous. The stored raw material supply device main body 13 is configured so that the supply device center line CL13 connecting the center C5 of the raw material conveying direction of raw material inlet 13A of the stored raw material supply device main body 13 and the center C6 of the raw material conveying direction of raw material discharge port 3B (see Figure 6) of the stored raw material supply device main body 13 is inclined with respect to the hopper center line CL1 connecting the center C1 of the raw material conveying direction of raw material inlet 1A of the hopper 1 and the center C2 of the raw material conveying direction of raw material discharge port 1B of the hopper 1, and is inclined with respect to the upper surface 4a of the belt conveyor 4.

[0044] Specifically, as shown in Figures 4 to 6, the storage raw material supply device main body 13 is a rectangular cylinder having a front wall 13a located downstream in the raw material conveying direction, a rear wall 13b located upstream in the raw material conveying direction, a left side wall 13c, and a right side wall 13d, and a raw material inlet 13A opening upward is formed at the top of the rectangular cylinder, and a raw material outlet 13B opening downward is formed at the bottom of the rectangular cylinder.

[0045] However, unlike the stored raw material supply device main body 3, the stored raw material supply device main body 13 has a supply device center line CL13 that connects the center C5 of the raw material inlet 13A of the stored raw material supply device main body 13 in the raw material conveying direction with the center C6 of the raw material discharge outlet 13B of the stored raw material supply device main body 13 in the raw material conveying direction, and an intersection point P13 between the supply device center line CL13 and the upper surface 4a of the belt conveyor 4, which is located upstream in the raw material conveying direction of the hopper center line CL1 that connects the center C1 of the raw material inlet 1A of the hopper 1 in the raw material conveying direction with the center C2 of the raw material discharge outlet 1B of the hopper 1 in the raw material conveying direction, and the supply device center line CL13 is inclined downward from downstream to upstream with respect to the hopper center line CL1. The inclination angle of the supply device center line CL13 with respect to the hopper center line CL1 is θ3. 6, the front wall 13a and rear wall 13b of the stored raw material supplying device main body 13 are inclined downward from the downstream side to the upstream side in the raw material conveying direction, parallel to the supplying device center line CL13. As a result, the front wall 13a on the downstream side in the raw material conveying direction of the stored raw material supplying device main body 13 is inclined downward from the downstream side to the upstream side with respect to the upper surface 4a of the belt conveyor 4. The inclination angle of the front wall 13a with respect to the upper surface 4a of the belt conveyor 4 is θ4.

[0046] As shown in FIG. 5, the left side wall 13c and the right side wall 13d of the storage raw material supply device main body 13 are made up of inclined plates that are inclined so that the distance between them gradually narrows from top to bottom.

[0047] By configuring the stored raw material supply device main body 13 in such a manner that the supply device center line CL13 is inclined at an inclination angle θ3 with respect to the hopper center line CL1 and the front wall 13a is inclined at an inclination angle θ4 with respect to the upper surface 4a of the belt conveyor 4, the raw material S introduced into the stored raw material supply device main body 3 from the hopper 1 is sent out onto the upper surface 4a of the belt conveyor 4 via the inclined front wall 13a. This makes it possible to reduce the vertical powder pressure on the upper surface 4a of the belt conveyor 4 that is generated by the weight of the raw material S stored in the hopper 1.

[0048] The inclination angle θ4 of the front wall 13a of the storage raw material supply device main body 3 relative to the upper surface 4a of the belt conveyor 4 is preferably 60° to 89°. If the inclination angle θ4 is less than 60°, the raw material S may become clogged or stuck on the front wall 13a due to the properties of the raw material S. On the other hand, if the inclination angle θ4 is 90°, it is not possible to reduce the powder pressure in the vertical direction on the upper surface of the belt conveyor 4. In this embodiment, the inclination angle θ4 of the front wall 13a of the storage raw material supply device main body 3 relative to the upper surface 4a of the belt conveyor 4 is approximately 70°.

[0049] In addition, the upper limit of the opening area of ​​the raw material discharge port 13B of the storage raw material supply device main body 13 is 1 m 2 because the raw material S is granular material such as ore, coal, sintered ore, coke, etc. 2 The larger the opening area of ​​the raw material discharge port 13B, the more the powder pressure in the vertical direction applied to the belt conveyor 4 increases. 2 If it is larger than this, the vertical powder pressure applied to the belt conveyor 4 becomes too large, and the load on the motor when the belt conveyor 4 feeds the raw material S from the hopper 1 increases. If the rated power of the motor is increased to deal with this when the belt conveyor 4 feeds the raw material S from the hopper 1, the breaking strength of the belt may be exceeded. For this reason, the upper limit of the opening area of ​​the raw material discharge port 13B of the storage raw material supply device main body 13 is set to 1 m when the raw material S is granular material such as ore, coal, sintered ore, or coke. 2 It is preferable that:

[0050] In addition, since an iron conveyor called a pan conveyor can feed the raw material S with a large power, the opening area of ​​the raw material discharge port 13B is set to 1 m 2 There's no problem with making it bigger.

[0051] Furthermore, it is preferable that the dimension B2 in the raw material conveying direction of raw material discharge port 13B of stored raw material supply device main body 13 is equal to or smaller than the dimension A2 in the raw material conveying direction of raw material inlet 13A of stored raw material supply device main body 13. By making the dimension B2 in the raw material conveying direction of raw material discharge port 13B equal to or smaller than the dimension A2 in the raw material conveying direction of raw material inlet 13A, the opening area of ​​raw material discharge port 13B can be reduced. In this embodiment, the dimension B2 in the raw material conveying direction of raw material discharge port 13B is equal to the dimension A2 in the raw material conveying direction of raw material inlet 13A.

[0052] Furthermore, there are no particular restrictions on the height H2 of the storage raw material supply device main body 3 according to the Jansen equation of powder theory, and it can be determined based on the relative positions of the hopper 1 and the belt conveyor 4, and when configured to a typical height, it will be approximately 1 to 2 meters.

[0053] Thus, according to the second embodiment of the stored raw material supplying device 2, the stored raw material supplying device main body 13 is configured so that the supplying device center line CL13 is inclined relative to the hopper center line CL1 so that the intersection P13 between the supplying device center line CL13 and the upper surface 4a of the belt conveyor 4 as a conveying equipment is upstream of the intersection P1 between the hopper center line CL1 and the upper surface of the belt conveyor 4 in the raw material conveying direction, and the front wall 13a on the downstream side of the stored raw material supplying device main body 3 in the raw material conveying direction is inclined so as to descend from the downstream side to the upstream side relative to the upper surface 4a of the belt conveyor 4.

[0054] As a result, the raw material S introduced from the hopper 1 into the main body 3 of the stored raw material supply device is sent out onto the upper surface 4a of the belt conveyor 4 via the inclined front wall 13a of the main body 3 of the stored raw material supply device, thereby reducing the vertical powder pressure on the upper surface 4a of the belt conveyor 4 caused by the weight of the raw material S stored in the hopper 1.

[0055] Furthermore, in the stored raw material supply device 2 according to the second embodiment, the inclination angle θ4 of the front wall 13a on the downstream side in the raw material conveying direction of the stored raw material supply device body 3 relative to the upper surface 4a of the belt conveyor 4 is 60° to 89°.

[0056] This makes it possible to reduce the powder pressure in the vertical direction on the upper surface 4a of the belt conveyor 4 while avoiding the possibility that the raw material S will clog or become stuck on the front wall 13a due to the properties of the raw material S.

[0057] In addition, according to the stored raw material supply device 2 of the second embodiment, the conveying equipment is a belt conveyor 4, the raw material S is a granular material, and the upper limit of the opening area of ​​the raw material discharge port 13B of the stored raw material supply device main body 13 is 1 m 2 is.

[0058] As a result, when the raw material S is granular, the powder pressure in the vertical direction applied to the belt conveyor 4 can be suppressed, and the raw material S can be accurately fed from the hopper 1 using a general belt conveyor 4.

[0059] Furthermore, according to the stored raw material supply device 2 of the second embodiment, the dimension B2 in the raw material conveying direction of the raw material discharge outlet 13B of the stored raw material supply device main body 13 is less than or equal to the dimension A2 in the raw material conveying direction of the raw material inlet 13A of the stored raw material supply device main body 13.

[0060] This reduces the opening area of ​​the raw material discharge port 13B, and the powder pressure in the vertical direction on the upper surface 4a of the belt conveyor 4 can be reduced. Although the embodiment of the present invention has been described above, the present invention is not limited to this and various modifications and improvements can be made.

[0061] For example, in the first embodiment, the front wall 3a on the downstream side in the raw material conveying direction and the rear wall 3b on the upstream side in the raw material conveying direction are parallel to the center line CL3 of the supplying device, but they do not necessarily have to be parallel to the center line CL3 of the supplying device. However, it is preferable that the dimension B1 of the raw material discharge port 3B in the raw material conveying direction be equal to or smaller than the dimension A1 of the raw material inlet 3A in the raw material conveying direction. Similarly, in the second embodiment, the front wall 13a on the downstream side in the raw material conveying direction and the rear wall 13b on the upstream side in the raw material conveying direction are parallel to the center line CL13 of the supplying device, but they do not necessarily have to be parallel to the center line CL13 of the supplying device. However, it is preferable that the dimension B2 of the raw material discharge port 13B in the raw material conveying direction be equal to or smaller than the dimension A2 of the raw material inlet 13A in the raw material conveying direction.

[0062] Furthermore, the raw material S is in the form of granular material such as ore, coal, sintered ore, or coke, but may also be in the form of powder such as iron lump powder. Furthermore, although the belt conveyor 4 has been used as an example of the conveying equipment, any equipment other than the belt conveyor 4 may be used as long as it can convey the raw material S. [Example]

[0063] In order to verify the effects of the present invention, the load power (kw) generated on the belt conveyor was investigated for invention examples 1 and 2 and comparative examples 1 and 2. In Example 1 of the present invention, the stored raw material supplying device 2 according to the first embodiment shown in Figures 1 to 3 is used as the stored raw material supplying device. In Example 1 of the present invention, the inclination angle θ2 of the rear wall 3b of the stored raw material supplying device main body 3 relative to the upper surface 4a of the belt conveyor 4 is 70°.

[0064] In addition, Example 2 of the present invention uses the stored raw material supplying device 2 according to the second embodiment shown in Figures 4 to 6. In Example 2 of the present invention, the inclination angle θ4 of the front wall 13a of the stored raw material supplying device main body 13 with respect to the upper surface 4a of the belt conveyor 4 is 70°. In Comparative Example 1, the stored raw material supply device 2 shown in FIGS. 7 and 8 was used as the stored raw material supply device.

[0065] 7 and 8, the stored raw material supplying device 2 according to Comparative Example 1 includes a stored raw material supplying device main body 23 connected to the bottom of a hopper 1 that stores raw material S. The stored raw material supplying device main body 23 is a rectangular cylinder with a front wall 23a located downstream in the raw material conveying direction, a rear wall 23b located upstream in the raw material conveying direction, a left side wall 13c, and a right side wall 13d. A raw material inlet opening upward is formed at the top of the rectangular cylinder, and a raw material outlet opening downward is formed at the bottom of the rectangular cylinder. The stored raw material supplying device main body 23 is configured perpendicular to the top surface 4a of the belt conveyor 4 so that a supplying device center line CL23 connecting the center C7 of the raw material inlet of the stored raw material supplying device main body 23 in the raw material conveying direction and the center C8 of the raw material outlet of the stored raw material supplying device main body 23 in the raw material conveying direction is coaxial with a hopper center line CL1 connecting the center C1 of the raw material inlet of the hopper 1 in the raw material conveying direction and the center C2 of the raw material outlet of the hopper 1 in the raw material conveying direction. The left side wall 23c and the right side wall 23d of the storage raw material supply device main body 23 are made up of inclined plates that are inclined so that the distance between them gradually narrows from top to bottom, as shown in Figure 8, similar to Examples 1 and 2 of the present invention.

[0066] In Comparative Example 2, the stored raw material supply device 2 shown in FIG. 9 was used as the stored raw material supply device.

[0067] The stored raw material supplying device 2 according to Comparative Example 2 shown in Figure 9 includes a stored raw material supplying device main body 33 connected to the bottom of a hopper 1 that stores raw material S. The stored raw material supplying device main body 33 is formed in a cylindrical shape, with a raw material inlet opening upward at the top of the cylinder and a raw material outlet opening downward at the bottom of the cylinder. The stored raw material supplying device main body 33 is configured perpendicular to the upper surface 4a of the belt conveyor 4 so that a supplying device center line CL33 connecting the center C9 of the raw material inlet of the stored raw material supplying device main body 33 in the raw material conveying direction and the center C10 of the raw material outlet of the stored raw material supplying device main body 33 in the raw material conveying direction is coaxial with a hopper center line CL1 connecting the center C1 of the raw material inlet of the hopper 1 in the raw material conveying direction and the center C2 of the raw material outlet of the hopper 1 in the raw material conveying direction.

[0068] Figure 10 shows the results of a survey of the load power (kW) generated on the belt conveyor 4 when raw material S was sent from the hopper 1 onto the belt conveyor 4 using the storage raw material supply devices of each of Invention Examples 1, 2, Comparative Examples 1, and 2, and the belt conveyor 4 was driven to transport the raw material S in the raw material transport direction.

[0069] As shown in FIG. 10, the load power (kW) generated on the belt conveyor 4 was 7.95 (kW) in the case of Comparative Example 1 and 9.34 (kW) in the case of Comparative Example 2, whereas it was reduced to 4.74 (kW) in the case of Inventive Example 1 and 5.67 (kW) in the case of Inventive Example 2.

[0070] In the case of Examples 1 and 2 of the present invention, the main body 3, 13 of the stored raw material supply device is structured to be inclined relative to the upper surface 4a of the belt conveyor 4 as a conveying equipment, thereby reducing the vertical powder pressure on the upper surface 4a of the belt conveyor 4 caused by the weight of the raw material S stored in the hopper 1, and reducing the load power (kw) generated on the belt conveyor 4.

[0071] In the case of Invention Example 1, the load power generated on the belt conveyor 4 is reduced by 0.93 (kW) compared to Invention Example 2. The reason for this is that in Invention Example 1, the rear wall 3b on the upstream side in the raw material conveying direction of the storage raw material supply device main body 3 that receives the raw material S is inclined downward from the upstream side toward the downstream side with respect to the upper surface 4a of the belt conveyor 4, which improves the fluidity of the raw material S from the upstream side to the downstream side in the raw material conveying direction, and further reduces the powder pressure in the vertical direction on the upper surface 4a of the belt conveyor 4. [Explanation of symbols]

[0072] 1 Hopper 1A Raw material inlet 1B Raw material discharge port 2. Storage raw material supply device 3. Storage material supply device body 3a front wall 3b Back wall 3c Left side wall 3d right side wall 3A Raw material inlet 3B Raw material discharge outlet 4 Transport Equipment (Conveying Equipment) 4a above 13. Main body of the raw material supply device for storage 13a Anterior wall 13b Rear wall 13c Left side wall 13d right side wall 13A Raw material inlet 13B Raw material discharge outlet 23. Main body of the raw material supply device for storage 23a Anterior wall 23b Rear wall 23c Left side wall 23d Right side wall 33. Main body of the raw material supply device for storage S raw materials

Claims

1. A stored raw material supplying device having a stored raw material supplying device body disposed below a hopper that stores raw materials and that delivers the raw materials stored in the hopper from the hopper to a conveying facility, The stored raw material supply device main body is configured so that the supply device center line connecting the center of the raw material inlet of the stored raw material supply device main body in the raw material conveying direction by the conveying equipment and the center of the raw material discharge outlet of the stored raw material supply device main body in the raw material conveying direction is inclined with respect to the hopper center line connecting the center of the raw material inlet of the hopper in the raw material conveying direction and the center of the raw material discharge outlet of the hopper in the raw material conveying direction, and is inclined with respect to the top surface of the conveying equipment.

2. The stored raw material supply device of claim 1, wherein the center line of the supply device main body is inclined relative to the center line of the hopper so that the intersection of the center line of the supply device and the top surface of the conveying equipment is downstream in the raw material conveying direction from the intersection of the center line of the hopper and the top surface of the conveying equipment, and the rear wall of the upstream side of the stored raw material supply device main body in the raw material conveying direction is inclined downward from the upstream side to the downstream side relative to the top surface of the conveying equipment.

3. The stored raw material supply device of claim 1, wherein the center line of the supply device main body is inclined relative to the center line of the hopper so that the intersection of the center line of the supply device and the top surface of the conveying equipment is upstream of the intersection of the center line of the hopper and the top surface of the conveying equipment in the raw material conveying direction, and the front wall of the stored raw material supply device main body on the downstream side in the raw material conveying direction is inclined downward from the downstream side to the upstream side relative to the top surface of the conveying equipment.

4. 3. The stored raw material supply device according to claim 2, wherein the rear wall of the stored raw material supply device body on the upstream side in the raw material conveying direction has an inclination angle of 60° to 89° with respect to the upper surface of the conveying equipment.

5. 4. The stored raw material supply device according to claim 3, wherein the inclination angle of the front wall of the stored raw material supply device body on the downstream side in the raw material conveying direction relative to the upper surface of the conveying equipment is 60° to 89°.

6. the conveying equipment is a belt conveyor, The raw material is a granular material, The upper limit of the opening area of ​​the raw material discharge port of the storage raw material supply device body is 1 m ２ 6. The storage material supply device according to claim 4 or 5, wherein

7. 6. The stored raw material supply device according to claim 4, wherein the dimension of the raw material discharge port of the stored raw material supply device body in the raw material conveying direction is equal to or smaller than the dimension of the raw material inlet of the stored raw material supply device body in the raw material conveying direction.

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