How to add a cement silo and air slider

Abstract

To provide a cement silo capable of continuing the derivation of cement for a long period.SOLUTION: A cement silo 100 comprises: a silo body 30 having a storage part 35 storing cement C; a first air slider 10 and a second air slider 20 deriving the cement C from the storage part 35; and carrier devices 42A, 42B carrying the cement C derived by the first air slider 10 and the second air slider 20. The second air slider 20 is shorter than the first air slider 10, and a tip 25 of the second air slider 20 is more sharpened than a tip 15 of the first air slider 10.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a method for installing a cement silo and an air slider. [Background technology]

[0002] In cement factories, cement silos are used as storage facilities for storing cement. As shown in Patent Document 1, the cement stored in the cement silo is discharged by an air slider and transported to a port by a transport device such as a conveyor. Since such cement silos are usually huge, the cement hardens at positions away from the air slider due to moisture absorption and compaction, resulting in lumps of cement in the cement silo.

[0003] When cement lumps form inside a cement silo, the inside of the silo becomes clogged, making it difficult to remove the cement with an air slider. When the air slider becomes clogged in this way, the cement silo must be shut down and the cement lumps must be removed manually. During this removal work, the cement silo cannot be used, and the work of removing the cement lumps requires a lot of manpower and costs. For this reason, Patent Document 1 proposes providing a gas injection means to suppress the progress of cement consolidation and accumulation inside the silo. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2007-197190 A Summary of the Invention [Problem to be solved by the invention]

[0005] When the air slider becomes clogged with cement lumps (hereinafter referred to as "cement lumps") and it becomes difficult to discharge the cement from the cement silo, it is necessary to shut down the cement silo, open it, and remove the cement lumps. When the cement silo is large, such cement lump removal work can take as long as several months. This raises concerns that the production of cement itself may be restricted.

[0006] Therefore, the present invention provides a cement silo that can continue to discharge cement for a long period of time, and a method for adding air sliders that can smoothly add air sliders even when the cement silo is in operation. [Means for solving the problem]

[0007] The present invention provides a cement silo comprising a silo body having a storage section for storing cement, first and second air sliders for discharging the cement from the storage section, and a conveying device for conveying the cement discharged by the first and second air sliders, wherein the second air slider is shorter than the first air slider, and the end of the second air slider opposite the conveying device side is sharper than the end of the first air slider opposite the conveying device side.

[0008] The cement silo includes a second air slider that is shorter than the first air slider. The end of the second air slider opposite the conveying device side is more pointed than the end of the first air slider opposite the conveying device side. Since the second air slider is shorter than the first air slider and has one pointed end, it can be inserted into the cement silo with the pointed end as the leading end. Therefore, even if the first air slider is blocked, cement can continue to be discharged from the second air slider. Therefore, cement can be continuously discharged for a long period of time.

[0009] The second air slider is preferably provided above the first air slider so as to be aligned with the first air slider in the storage section. This allows the cement to be continuously discharged from the second air slider even if a cement lump occurs at the end of the first air slider on the conveying device side. When it is desired to discharge cement from the silo body, for example, the flow rate of each air slider is not controlled, but the air slider that can satisfy the desired flow rate is controlled to open and close. Therefore, an air slider that cannot satisfy the desired flow rate is not very suitable for discharging cement. On the other hand, if the cement is not discharged evenly from the silo body, the frequency of occurrence of cement lumps increases. For example, the first air slider is evenly arranged in the silo body so that the cement can be discharged evenly. Therefore, in order to utilize the discharge arrangement at the beginning of the silo design and to discharge the cement evenly, the second air slider is preferably provided above the first air slider so as to be aligned with the first air slider in the storage section.

[0010] The silo body of the cement silo has a side wall that is circular in plan view, and a tunnel that penetrates along the radial direction of the circle and in which a transport device is disposed. A plurality of first air sliders and a plurality of second air sliders extend from the inner wall side of the tunnel toward the side wall side, and it is preferable that the ends of the plurality of second air sliders on the transport device side are biased toward the side wall of the silo body compared to the ends of the plurality of first air sliders on the transport device side. The cement contained in the storage section of the silo body is more susceptible to the effects of external moisture and the like in the portion closer to the side wall than in the central portion of the silo body. Among the portions closer to the side wall, the vicinity of the end of the first air slider on the inner wall side of the tunnel has a smaller flow rate of cement due to the lead-out of the cement from the first air slider, so that the cement is particularly likely to solidify. The cement silo has a plurality of first air sliders and second air sliders, and the ends of the plurality of second air sliders on the transport device side are biased toward the side wall. This allows the cement to be extracted from areas where the cement is more likely to harden, and allows the extraction of cement to continue for a longer period of time.

[0011] The bottom surface of the storage section of the silo body has an uneven structure, and the end of the first air slider and the end of the second air slider are preferably arranged at a position lower than the top of the convex part. In this way, when the bottom surface of the silo body has an uneven structure, the cement inventory can be sufficiently reduced, but the cement is likely to solidify in the concave part. Therefore, by arranging the ends of the first air slider and the second air slider at a position lower than the top of the convex part, the cement blockage can be sufficiently suppressed, and the cement can be extracted until the cement inventory is sufficiently low.

[0012] The present invention provides a method for adding air sliders to a cement silo equipped with a silo body having a storage section for storing cement, a first air slider for discharging cement from the storage section, and a conveying device for conveying the cement discharged by the first air slider, the method including an insertion step of inserting a second air slider that is shorter than the first air slider and has one end that is sharper than the first air slider, from the outside of the storage section toward the inside.

[0013] According to the above-mentioned method of addition, even when the cement silo is in operation and cement is stored in the storage section of the silo body where the first air slider is provided, the second air slider can be newly inserted to add an air slider. In addition, even when the cement silo is in operation, the less cement is stored in the storage section of the silo body, the easier the addition can be. In other words, this is preferable from the viewpoint that the second air slider can be added without stopping the operation of the cement silo. The second air slider is shorter than the first air slider and one end is sharper than the first air slider, so that the second air slider can be smoothly inserted and added. As a result, even if the first air slider is blocked, the second air slider can continue to discharge the cement.

[0014] In the inserting step, it is preferable to insert an end of the second air slider into the cement contained in the storage section. Since the second air slider is shorter than the first air slider and has one end that is more pointed than the first air slider, even if the cement solidifies in the storage section and cement lumps are generated, the second air slider can be inserted to crush the cement lumps, and the cement can be continuously discharged from the storage section of the silo body.

[0015] The method includes a selection step of selecting a first air slider that is experiencing a cement discharge failure from among a plurality of first air sliders, and in the insertion step, it is preferable to insert a second air slider into the cement at a position among the plurality of first air sliders that is closest to the first air slider selected in the selection step. When a cement discharge failure occurs in the first air slider, the fluidity of the cement in the vicinity of the first air slider decreases, and the cement lump is likely to become large. Therefore, by inserting the second air slider into the cement at a position closest to the first air slider selected in the selection step, it is possible to prevent the cement lump from becoming large and to continue discharging the cement from the storage section of the silo body. Effect of the Invention

[0016] According to the present invention, it is possible to provide a cement silo capable of continuing to discharge cement for a long period of time, and a method for adding air sliders that allows air sliders to be smoothly added even when the cement silo is in operation. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a front view of a cement silo. [Diagram 2] FIG. 2 is a plan view of a cement silo. [Diagram 3] FIG. 2 is a diagram showing the arrangement of through holes provided in the inner wall of a tunnel. [Figure 4] 4 is a perspective view showing an end portion of a first air slider on the opposite side to the transport device side. FIG. [Diagram 5] 13 is a perspective view showing the end portion of the second air slider opposite the transport device side. FIG. [Figure 6] 1A is a plan view showing an end portion of a first air slider opposite to the transport device side, and FIG. 1B is a plan view showing an end portion of a second air slider opposite to the transport device side. [Figure 7]FIG. 2 is a cross-sectional view showing the structure near the inner wall of the tunnel in the silo body. [Figure 8] 3 is a cross-sectional view showing a part of a cross section taken along line VIII-VIII in FIG. 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the drawings as needed. However, the following embodiment is an example for explaining the present invention, and is not intended to limit the present invention to the following content. In the description, the same reference numerals are used for the same elements or elements having the same functions, and redundant description is omitted as the case may be. Furthermore, positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings, unless otherwise specified. Furthermore, the dimensional ratios of each element are not limited to those shown in the drawings.

[0019] FIG. 1 is a front view of a cement silo according to an embodiment. However, in FIG. 1, structures in a storage section 35 are also shown in solid lines to help understand the internal structure of the cement silo. The cement silo 100 in FIG. 1 includes a silo body 30 having a storage section 35 for storing cement C, a first air slider 10 and a second air slider 20 for discharging the cement C from the storage section 35, and a conveying device 42 for conveying the cement C discharged by the first air slider 10 and the second air slider 20. The storage section 35 is partitioned from the outside by a cylindrical side wall 31, a top plate 32 covering the upper end side of the side wall, and an inner wall 44 of a tunnel 40. The top plate 32 may have an inlet (not shown) for introducing the cement C into the storage section 35.

[0020] The silo body 30 includes a side wall 31 that is circular in plan view, and a tunnel 40 that penetrates along the radial direction of the circle and in which the conveying devices 42A and 42B are arranged. In this embodiment, two conveying devices 42A and 42B are arranged in parallel to each other along the longitudinal direction, but there may be only one conveying device, or three or more conveying devices may be arranged in parallel. The conveying devices 42A and 42B are devices that convey the cement C extracted from the first air slider 10 and the second air slider from the storage section 35 of the silo body 30 to other equipment, and may be, for example, a flow conveyor.

[0021] The bottom surface 34 of the storage section 35 of the silo body 30 is inclined so as to gradually lower from the side wall 31 toward the inner wall 44 of the tunnel 40. Along this bottom surface 34, a first air slider 10 is provided for extracting the cement C stored in the storage section 35 to the conveying device 42. The tip end 15 of the first air slider 10 is disposed near the side wall 31 of the storage section 35, and the base end 16 of the first air slider 10 is connected to the conveying device 42. The base end 16 of the first air slider 10 is the end on the conveying device 42 side, and the tip end 15 is the end on the opposite side to the conveying device 42 side. The first air slider 10 penetrates the inner wall 44 of the tunnel 40 near the base end 16. This allows the cement C in the storage section 35 to be extracted to the outside of the storage section 35.

[0022] The second air slider 20 is provided above the first air slider 10 so as to be aligned with the first air slider 10 in the storage section 35. The tip end 25 of the second air slider 20 is disposed near the inner wall 44 of the storage section 35, and the base end 26 of the second air slider 20 is connected to the vicinity of the base end 16 of the first air slider 10 in the tunnel 40. The base end 26 of the second air slider 20 is the end on the conveying device 42 side, and the tip end 25 is the end on the opposite side to the conveying device 42 side. The second air slider 20 penetrates the inner wall 44 of the tunnel 40 near the base end 26. This allows the cement C in the storage section 35 to be extracted to the outside of the storage section 35.

[0023] The second air slider 20 is shorter than the first air slider 10. When the length of the first air slider 10 in the housing portion 35 is L1 and the length of the second air slider 20 in the housing portion 35 is L2, L2 / L1 may be 0.05 to 0.5, or may be 0.1 to 0.4. The length L1 of the first air slider 10 may be, for example, 5 to 20 m. The length L2 of the second air slider 20 may be, for example, 0.5 to 4 m. When there are multiple first air sliders 10, L1 is the length of the shortest first air slider 10. On the other hand, when there are multiple second air sliders 20, L2 is the length of the longest second air slider 20.

[0024] The tip 15 of the first air slider 10 is disposed closer to the side wall 31 than the inner wall 44 of the tunnel 40. On the other hand, the tip 25 of the second air slider 20 is disposed closer to the inner wall 44 of the tunnel 40 than the side wall 31. This allows the tips 15 and 25, which serve as inlets for the cement C, to be dispersed in the storage section 35, thereby reducing the so-called dead space where no inlet for the cement C is located. In addition, the growth of cement masses above the vicinity of the base end 16 of the first air slider 10 within the storage section 35 is suppressed, and the cement C can be continuously discharged from the second air slider 20.

[0025] However, the arrangement of the tips 15, 25 is not limited to this, and in a modified example, the tip 15 of the first air slider 10 may be arranged closer to the inner wall 44 of the tunnel 40 than the side wall 31. In another modified example, the tip 25 of the second air slider 20 may be arranged closer to the side wall 31 than the inner wall 44 of the tunnel 40.

[0026] Fig. 2 is a plan view of the cement silo 100. In Fig. 2, however, the second air slider 20 is shown by a solid line in order to easily understand the positional relationship between the first air slider 10 and the second air slider 20 in the storage section 35 of the silo body 30. As shown in Fig. 2, the cement silo 100 has a plurality of first air sliders 10 and a plurality of second air sliders 20.

[0027] Specifically, nine first air sliders 10 connected to one conveying device 42A extend from the inner wall 44 side toward the side wall 31 side. The first air sliders 10 connected to the other conveying device 42B extend from the inner wall 44 side toward the side wall 31 side. The nine first air sliders 10 connected to the conveying device 42A (42B) are lined up at a predetermined interval along the conveying direction of the conveying device 42A, and adjacent first air sliders 10 extend parallel to each other. The lengths of adjacent first air sliders 10 are different from each other, so that the tip portions 15 of the first air sliders 10 extending from the conveying device 42A (42B) are lined up along the circumferential direction inside the side wall 31.

[0028] The second air sliders 20 are provided above some of the multiple first air sliders. Specifically, among the nine first air sliders 10 extending from one conveying device 42A, four second air sliders 20 extend above a pair of first air sliders 10 arranged closest to the side wall 31 and the first air sliders 10 adjacent thereto, with the tip portions 25 facing the side wall 31. The four second air sliders 20 extend in parallel to each other. Similarly, among the nine first air sliders 10 extending from the other conveying device 42B, four second air sliders 20 extend above a pair of first air sliders 10 arranged closest to the side wall 31 and the first air sliders 10 adjacent thereto, with the tip portions 25 facing the side wall 31. Therefore, the cement silo 100 has a total of 18 first air sliders 10 and a total of eight second air sliders 20.

[0029] In the storage section 35, the area close to the side wall 31 is easily affected by moisture. Among the outer peripheral areas of the storage section 35, the area 65 between the air slider arranged on the outermost side and the side wall is an area where the cement does not flow easily and is likely to harden. In this embodiment, as shown in FIG. 2, the base ends 26 of the second air sliders 20 are biased toward the side wall 31 of the silo body 30 compared to the base ends 16 of the first air sliders 10. As a result, the tip ends 25 of the second air sliders 20 are biased toward the opening 46 of the tunnel 40 compared to the tip ends 15 of the first air sliders 10. Therefore, the cement is prevented from hardening in the area 65, and the cement C can be stably discharged for a longer period of time.

[0030] FIG. 3 is a diagram showing the arrangement of the through holes 14, 24 provided in the inner wall 44 of the tunnel 40. FIG. 3 is a diagram showing the inner wall 44 from inside the tunnel 40 toward the side wall 31. The first air slider 10 is inserted into the through hole 14, and the second air slider 20 is inserted into the through hole 24. Note that FIG. 3 shows the arrangement of the through holes 14, 24, so the first air slider 10 and the second air slider 20 are not shown. The first air sliders 10 are inserted into the through holes 14 at the same height. The second air sliders 20 are also inserted into the through holes 24 at the same height. The through hole 24 into which the second air slider 20 is inserted is biased toward the opening 46 of the tunnel 40 compared to the through hole 14 into which the first air slider 10 is inserted.

[0031] In this embodiment, the second air slider 20 is provided only above the first air slider 10 arranged on the outermost side and the first air slider 10 located inside the first air slider 10 among the plurality of first air sliders 10, but this is not limited to the above. For example, in a modified example, the second air slider 20 may be provided only above the first air slider 10 arranged on the outermost side. Also, the number of the first air sliders 10 and the second air sliders 20 may be appropriately changed, and the second air slider 20 may be provided above all the first air sliders 10. Also, the second air slider 20 is not limited to being vertically above the first air slider 10, and may be shifted from being vertically above. For example, one second air slider 20 may be provided above the midpoint between two adjacent first air sliders 10. The plurality of first air sliders 10 may not be at the same height, and may be provided at different heights from each other. The plurality of second air sliders 20 may also not be at the same height, and may be provided at different heights from each other.

[0032] 4 is a perspective view showing the tip 15 of the first air slider 10. The first air slider 10 comprises a metal channel member 11 forming an air flow path, and a cloth canvas 12 covering the upper surface of the channel member 11 and forming a conveying surface for cement C. Air pipes 17 for supplying air are connected to the bottom surface of the channel member 11 at predetermined intervals along the longitudinal direction of the channel member 11. Air is introduced into the air pipes 17 from a blower (not shown) outside the silo body 30.

[0033] The channel member 11 and the cloth canvas 12 form an air chamber, and the air supplied to the air chamber from the air pipe 17 flows through the air chamber and is blown out from the upper surface (conveying surface) of the cloth canvas 12. The cement C flows along the tip 15 of the first air as the air is blown out. The flowing cement C flows on the cloth canvas 12 exposed at the tip 15, flows into the gap between the cover member 13 and the cloth canvas 12 from the inlet 13a of the cover member 13 provided to cover the cloth canvas 12, flows through the first air slider 10, and flows to the conveying device 42A (42B). In this way, the cement C is extracted from the storage section of the silo body 30. If the inlet 13a is blocked by a cement lump or if the cement is clogged between the cover member 13 and the cloth canvas 12, it becomes difficult to extract the cement C using the first air slider 10. From the viewpoint of efficient transport of the cement C, the cover member 13 only needs to be attached to the base end portion 16 side, and for example, the cover member 13 does not need to be provided in the silo body 30.

[0034] 5 is a perspective view showing the tip 25 of the second air slider 20. The second air slider 20 comprises a metal channel member 21 forming an air flow path, and a cloth canvas 22 covering the upper surface of the channel member 21 and forming a conveying surface for cement C. Air pipes 27 for supplying air are connected to the bottom surface of the channel member 21 at predetermined intervals along the longitudinal direction of the channel member 21. Air is introduced into the air pipes 27 from a blower (not shown) outside the silo body 30.

[0035] The channel member 21 and the cloth canvas 22 form an air chamber, and the air supplied to the air chamber from the air pipe 27 flows through the air chamber and is blown out from the upper surface (conveying surface) of the cloth canvas 22. The cement C flows along the tip 25 of the second air as the air is blown out. The flowing cement C flows on the cloth canvas 22 exposed at the tip 25, flows into the gap between the cover member 13 and the cloth canvas 12 from the inlet 23a of the cover member 23 provided to cover the cloth canvas 22, flows through the second air slider 20, and flows to the conveying device 42A (42B). In this way, the second air slider 20 also extracts the cement C from the storage section of the silo body 30 in the same manner as the first air slider 10.

[0036] The tip 25 of the second air slider 20 is pointed so that the center protrudes. That is, the tip 15 of the first air slider 10 is flat, whereas the tip 25 of the second air slider 20 has a triangular roof shape and is pointed. Therefore, the second air slider 20 can be inserted into the cement C more smoothly than the first air slider 10. The tip 25 may be arched or pyramidal in shape.

[0037] Fig. 6(A) is a plan view of the tip 15 of the first air slider 10, and Fig. 6(B) is a plan view of the tip 25 of the second air slider 20. The tip 15 of the first air slider 10 is flat as shown in Fig. 6, whereas the tip 25 of the second air slider 20 has a protruding central portion and is triangular in shape. Thus, the tip 25 of the second air slider 20 has a boat-shaped shape. For this reason, the second air slider 20 can also be called a boat-shaped slider.

[0038] 6, from the viewpoint of smooth insertion of the second air slider 20 into the storage section 35 of the silo body 30, the angle θ of the tip portion 25 of the second air slider 20 is preferably 120° or less, more preferably 90° or less, even more preferably 60° or less, and particularly preferably 45° or less. On the other hand, from the viewpoint of suppressing deformation of the tip portion 25 of the second air slider 20, the angle θ of the tip portion 25 is preferably 15° or more, and more preferably 30° or more.

[0039] The width W1 of the first air slider 10 is preferably 50 to 500 mm, and more preferably 150 to 350 mm, from the viewpoints of ensuring the installation space and a sufficient amount of delivered cement C. The width W2 of the second air slider 20 is preferably 50 to 500 mm, and more preferably 150 to 350 mm, from the viewpoints of ensuring the installation space and a sufficient amount of delivered cement C. From the viewpoint of utilizing the existing conveying device 42, it is preferable that the difference between the width W1 of the first air slider 10 and the width W2 of the second air slider 20 is small, and more preferably there is no difference.

[0040] FIG. 7 is a cross-sectional view showing the structure near the inner wall 44 of the tunnel in the silo body. FIG. 7 shows a cross section when cut along the vertical direction so as to pass through the base end 16 of the first air slider 10 and the second air slider 20. As shown in FIG. 7, the first air slider 10 and the second air slider 20 are provided by inserting them through the through holes 14 and 24. The base end 16 of the first air slider 10 is connected to the conveying device 42A. The base end 26 of the second air slider 20 is connected to the base end 16 of the first air slider 10. The base end 26 of the second air slider 20 is provided with an openable and closable valve, which can switch between the discharge of the cement C and the non-discharge of the cement C. Although not shown in FIG. 7, the first air slider 10 may also have a similar valve at the base end 16.

[0041] Even if the first air slider 10 becomes clogged with a cement lump, the second air slider 20 disposed above the first air slider 10 allows the cement C to continue to be discharged. Above the second air slider 20, an aeration pipe is inserted into the storage section for the cement C through a through hole in the inner wall 44. By blowing air through the aeration pipe, the fluidity of the cement C can be ensured and the cement C can be prevented from hardening.

[0042] Fig. 8 is a cross-sectional view showing a part of a cross section taken along line VIII-VIII in Fig. 2. Fig. 8 shows the positional relationship between the bottom surface 34 of the silo body 30 and the first air slider 10 and the second air slider 20 arranged on the bottom surface 34. The bottom surface 34 has an uneven structure in which convex portions and concave portions are alternately connected. This uneven structure is configured so that the concaves and convexes are alternately connected along the penetration direction of the tunnel 40. By having such an uneven structure, the cement C can be extracted from the storage section of the silo body 30 until the amount of cement C stored therein is sufficiently reduced.

[0043] The first air sliders 10 are arranged in the recesses 39 along the longitudinal direction of the recesses 39. The second air sliders 20 are arranged in the recesses 39 along the longitudinal direction of the recess 39 closest to the side wall 31 and the recess 39 adjacent thereto. The tip 15 of the first air slider 10 and the tip 25 of the second air slider 20 are arranged at a position lower than the top 37 of the convex portion. This prevents the cement C from solidifying in the recess 39 and making it difficult to extract it, and makes it possible to extract the cement C until the cement C remaining in the container is sufficiently low in stock.

[0044] In this embodiment, the bottom surface 34 of the silo body 30 has an uneven structure, but this is not limited thereto, and the bottom surface 34 may not have an uneven structure. Also, the uneven structure may be provided on only a part of the bottom surface 34. Also, the first air slider 10 may be disposed in all of the recesses 39, or the first air slider 10 may be disposed in only a part of the recesses 39.

[0045] The method for adding air sliders in one embodiment includes an inserting step of inserting the tip 25 of a second air slider 20, which is shorter than the first air slider 10 and has a tip 25 that is sharper than the tip 15 of the first air slider 10, from the outside to the inside of the storage section 35. This inserting step may be performed using a cement silo having only the first air slider 10 as an air slider, or may be performed using a cement silo that already has the first air slider 10 and the second air slider 20. Here, a case in which the second air slider 20 is added to the cement silo 100 will be described.

[0046] First, the first air slider 10 in which the discharge of the cement C is not good is selected (selection process). Here, when the first air slider 10 inserted in the through hole 14A in FIG. 3 is selected, a new through hole 24 is formed above the first air slider 10 next to the existing through hole 24. The through hole 24 may be formed using a normal drill or the like. The second air slider 20 is inserted into the newly formed through hole 24 so that the tip 25 of the second air slider 20 faces the cement C in the storage section 35. At this time, the tip 25 shown in FIG. 5 and FIG. 6(B) enters the cement C, and the second air is added. Thereafter, the base end 26 of the second air slider 20 is connected to the base end 16 of the first air slider 10 as shown in FIG. 7, and the valve 26V is opened, so that the discharge of the cement C by the added second air slider 20 can be started. As a result, even if the first air slider 10 provided in the through hole 14A is blocked and causes an improper discharge of the cement C, the amount of the cement C that can be discharged is ensured, and the discharge of the cement C can be continued.

[0047] Since the second air slider 20 is shorter than the first air slider 10, the addition work can be smoothly performed even when the conveying device 42A (42B) is arranged in the tunnel 40 and it is difficult to secure a sufficient working space. The second air slider 20 may be inserted into the storage section 35 when no cement is stored in the storage section 35 of the silo body 30. However, since the second air slider 20 can be inserted into the cement C in the storage section 35 when the cement C is stored in the storage section 35, there is an advantage that the operation can be continued without stopping the cement silo 100. Note that, during the stoppage of the cement silo, a through hole may be formed, and when the first air slider 10 is blocked, the tip portion 25 of the second air slider 20 may be inserted into the through hole formed beforehand to add the second air.

[0048] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. For example, in FIG. 2, the adjacent first air sliders 10 and the adjacent second air sliders 20 are parallel to each other, but the present invention is not limited to this. For example, the first air sliders 10 and the second air sliders 20 may be provided so as to spread radially in a plan view. In addition, the first air sliders 10 and the second air sliders 20 each have the cloth canvases 12, 22, but the present invention is not limited to this. For example, a material that can prevent cement from flowing into the air chamber, such as a porous board, can be appropriately used. In addition, the method of adding air sliders has been described by taking the case where the second air slider 20 is added to the cement silo 100 as an example, but the second air slider 20 may be added to a cement silo having a different structure. In addition, there is no particular limit to the number of second air sliders 20 to be added. Also, the base end 26 of the second air slider 20 may be connected directly to the conveying devices 42A, 42B instead of to the base end 16 of the first air slider 10. [Explanation of symbols]

[0049] 10...first air slider, 20...second air slider, 11,21...channel member, 12,22...cloth canvas, 13,23...lid member, 13a,23a...inlet, 14,24...through hole, 15,25...tip portion, 16,26...base portion, 26V...valve, 17,27...air pipe, 30...silo body, 31...side wall, 32...top plate, 34...bottom surface, 35...container portion, 37...top, 39...recess, 40...tunnel, 42,42A,42B...conveying device, 44...inner wall, 46...opening, 65...area, 100...cement silo.

Claims

1. A silo body having a storage section for storing cement, a side wall having a circular shape in a plan view, and a tunnel penetrating along a radial direction of the circle; A plurality of first air sliders and a plurality of second air sliders extending from the inner wall side of the tunnel toward the side wall side and directing the cement from the storage portion; A cement silo comprising: a conveying device disposed in the tunnel and configured to convey the cement guided by the first air sliders and the second air sliders, The second air sliders are shorter than the first air sliders and are provided above the first air sliders so as to be aligned with the first air sliders in the accommodation portion, end portions of the second air sliders on a side opposite to the conveying device side are sharper than end portions of the first air sliders on a side opposite to the conveying device side, A cement silo, wherein the ends of the plurality of second air sliders on the conveying device side are biased toward the side wall of the silo body relative to the ends of the plurality of first air sliders on the conveying device side.

2. A cement silo as described in claim 1, wherein the ends of the multiple second air sliders opposite the conveying device are pointed so that the central portion protrudes when viewed in a plan view.

3. A cement silo as described in claim 1 or 2, wherein the ends of the plurality of second air sliders opposite the conveying device have a triangular roof shape.

4. The bottom surface of the storage section of the silo body has an uneven structure, The cement silo according to any one of claims 1 to 3, wherein the ends of the first air sliders opposite the conveying device side and the ends of the second air sliders opposite the conveying device side are each positioned lower than the top of the convex portion.

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