Conveyance device

Abstract

To be able to convey a first object to be conveyed and a second object to be conveyed in a state where the ratios of the first object to be conveyed and the second object to be conveyed are uniform.SOLUTION: A conveyance device includes: a belt conveyor (12) for conveying a powder-like first object (S) to be conveyed; a gate (25) for leveling an upper surface of the first object (S) to be conveyed on the belt conveyor (12); and a powder supply part provided on the downstream of the gate (25) in a conveyance path, and for supplying a powder-like second object to be conveyed on the first object (S) to be conveyed on the belt conveyor (12). A protrusion part (38) is provided protruding downward with respect to the gate (25), and a recess part (S1) is provided at the central part in the width direction of the first object (S) to be conveyed, by the protrusion part (38). The powder supply part supplies the second object to be conveyed to the recess part (S1).SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a transport device. [Background technology]

[0002] Conventionally, there has been known a conveying device that uses a gate provided on the conveying path of a belt conveyor to flatten the top surface of a powder-like object such as soil supplied from a hopper onto the belt conveyor, thereby making the height of the object uniform (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2007-314269 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, there are cases where a powder-like second transported object is supplied from above to a first transported object on a belt conveyor, and the first transported object and the second transported object are transported together. In this case, it is desired to transport the first transported object and the second transported object in a state where the ratio of the first transported object to the second transported object is constant. However, since the first transported object and the second transported object are in a powder-like form, they are prone to clumping due to the influence of moisture, etc., and it is difficult to supply them evenly on the belt conveyor. For this reason, it has been difficult to transport the first transported object and the second transported object by the belt conveyor in a state where the ratio of the first transported object to the second transported object is uniform.

[0005] In view of these points, an object of the present invention is to enable a first transported object and a second transported object to be transported while maintaining a uniform ratio of the first transported object to the second transported object. [Means for solving the problem]

[0006] The present invention is a conveying device comprising a belt conveyor for conveying a first powder-like transported object, a gate for leveling the upper surface of the first transported object on the belt conveyor, and a powder supplying unit provided downstream of the gate on the conveying path for supplying a second powder-like transported object onto the first transported object on the belt conveyor, wherein a convex portion protruding downward from the gate is provided, and a concave portion is formed in the center of the width of the first transported object, and the powder supplying unit supplies the second transported object to the concave portion. Effect of the Invention

[0007] According to the transport device of the present invention, the first transport object and the second transport object can be transported with the ratio of the first transport object to the second transport object being uniform. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view showing a conveying device and a spray machine according to a first embodiment of the present invention. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. 4 is a view of the hopper device as seen from the downstream side in the conveying direction. [Diagram 5] FIG. 4 is a side view showing a schematic diagram of a conveying state by the conveying device. [Figure 6] 6 is a cross-sectional view taken along line VI-VI of FIG. 5. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. 5. [Figure 8] FIG. 11 is a perspective view of a hopper device according to a second embodiment, as viewed from above. [Figure 9] FIG. 2 is a perspective view of the hopper device as viewed from below. [Figure 10] XX cross-sectional view of FIG. 8. [Figure 11] FIG. 4 is a view of the hopper device as seen from the downstream side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a conveying device according to the present invention will be described with reference to the accompanying drawings.

[0010] [First embodiment] FIG. 1 is a perspective view showing a conveying device 10 and a spraying machine 11 according to a first embodiment of the present invention. The spraying machine 11 sprays the spraying material supplied from the conveying device 10 onto a target. The spraying machine 11 is used, for example, in spraying work for spraying mortar onto a slope for the purpose of protecting the slope.

[0011] The sprayer 11 mixes and stirs the sand and cement supplied from the transport device 10 with water inside to produce mortar. The spraying machine 11 includes an upper hook 11a, a lower hook 11b provided below the upper hook 11a, and a material charging port 11c provided above the upper hook 11a. The sand and cement transported by the transport device 10 are supplied to the upper kettle 11a from a material input port 11c. Water is supplied to the upper kettle 11a from a water supply hose (not shown) connected to the upper kettle 11a.

[0012] The upper kettle 11a mixes and stirs sand, cement, and water to produce mortar. A spray hose (not shown) is connected to the lower kettle 11b. The mortar supplied from the upper kettle 11a to the lower kettle 11b is sprayed from the spray hose by the pressure of air supplied from a compressor (not shown).

[0013] FIG. 2 is a perspective view of the conveying device 10. As shown in FIG. 1 and 2, the conveying device 10 includes a belt conveyor 12 and a hopper device 13 that supplies sand and cement to the belt conveyor 12. The belt conveyor 12 includes a conveyor frame 12a extending along a conveying direction D of the belt conveyor 12, rollers 12b and 12c supported at one end and the other end of the conveyor frame 12a, and an endless conveyor belt 12d stretched between the rollers 12b and 12c. In the belt conveyor 12, the rollers 12b and 12c are rotated by a driving source (not shown) such as a motor, thereby driving the conveyor belt 12d. In the following description, the direction perpendicular to the conveying direction D when viewed from above is defined as the width direction of the conveying device 10.

[0014] The belt conveyor 12 is disposed at an incline so as to ascend from the end 12e on the upstream side in the conveying direction of the belt conveyor 12 to the material inlet 11c. The end 12f on the downstream side in the conveying direction of the belt conveyor 12 is disposed above the material inlet 11c. The hopper device 13 is attached to the upstream end portion 12e. In the following description, the terms "upstream" and "downstream" refer to the upstream and downstream in the conveying direction.

[0015] Fig. 3 is a perspective view of the hopper device 13. Fig. 4 is a view of the hopper device 13 as viewed from the downstream side in the conveying direction. Fig. 5 is a side view diagrammatically showing a conveying state by the conveying device 10. The hopper device 13 includes a hopper 15 that receives sand S as a first powdered transport material and supplies it to the belt conveyor 12, and a second hopper 16 (powder supply section) that receives cement C as a second powdered transport material and supplies it to the belt conveyor 12.

[0016] When viewed from above, the hopper 15 is formed in a generally rectangular frame shape that opens upward and downward. The hopper 15 includes a pair of side walls 17 spaced apart in the width direction of the conveying device 10, a downstream wall 18 that connects the downstream ends of the side walls 17 in the width direction, and an upstream wall 19 that connects the upstream ends of the side walls 17 in the width direction.

[0017] The opening on the top surface of the hopper 15 is a sand inlet 20 through which the sand S is introduced. The opening on the bottom surface of the hopper 15 is a sand supply port 21 through which the sand S falls downward. The hopper 15 is formed in a funnel shape in which the width between a pair of side walls 17 narrows from the sand inlet 20 toward the sand supply port 21. The sand supply port 21 is located at the center of the hopper 15 in the width direction, and is narrower than the sand inlet 20.

[0018] The hopper 15 includes a plurality of frame portions 22 extending downward from the frame-shaped outer surface of the hopper 15. The hopper 15 is fixed to the belt conveyor 12 by connecting the frame portions 22 to the conveyor frame 12a. The hopper 15 is disposed such that the sand supply port 21 overlaps the conveyor belt 12d from above.

[0019] A second hopper 16 is attached to the downstream wall 18 of the hopper 15 . The downstream wall 18 is provided with a fixing hole 24 (FIG. 3) used for mounting the second hopper 16. The fixing hole 24 is an elongated hole extending vertically. The fixing holes 24 are provided as a pair spaced apart from each other in the width direction.

[0020] The hopper 15 is equipped with a gate 25 that levels the upper surface of the sand S. The gate 25 is formed in the downstream wall 18. The gate 25 is an opening formed by cutting the lower edge of the downstream wall 18 upward, and its width becomes smaller toward the top. Specifically, the gate 25 is formed by cutting out the lower edge of the downstream wall 18 in the shape of an isosceles triangle, and is located at the center in the width direction of the hopper 15. The gate 25 is also disposed at the center in the width direction of the conveyor belt 12d. The gate 25 is located downstream of the sand supply inlet 21 .

[0021] The second hopper 16 includes a main body 30 formed in a frame shape when viewed from above, and a lid 31 attached to the upper surface of the main body 30. The main body 30 is a generally rectangular frame that opens upward and downward. The main body 30 includes a pair of side walls 32 spaced apart in the width direction of the conveying device 10, a downstream wall 33 that connects downstream ends of the side walls 32 in the width direction, and an upstream wall 34 that connects upstream ends of the side walls 32 in the width direction.

[0022] An opening on the top surface of the main body 30 is a cement inlet 35 (FIG. 5) into which cement C is poured. An opening on the bottom surface of the main body 30 is a cement supply port 36 (FIGS. 4 and 5) through which cement C drops downward. The main body 30 is formed in a funnel shape in which the width between a pair of side walls 32 narrows from the cement inlet 35 toward the cement supply port 36. The cement supply port 36 is located at the center of the second hopper 16 in the width direction, and is narrower than the cement inlet 35.

[0023] The second hopper 16 is attached to the hopper 15 by connecting the upstream wall portion 34 to the downstream wall 18 of the hopper 15 . In detail, the second hopper 16 is fixed to the downstream wall 18 by fastening fasteners 37 (FIG. 5) that are inserted into the fixing holes 24 (FIG. 3) from within the hopper 15 to the upstream wall portion 34. The fasteners 37 are, for example, screwed into a nut portion provided on the upstream wall portion 34.

[0024] Because the fixing holes 24 through which the fasteners 37 are inserted are elongated holes, the second hopper 16 can be attached by changing its position in the vertical direction relative to the hopper 15. When changing the position of the second hopper 16, the fasteners 37 are loosened, and then the second hopper 16 is moved in the vertical direction within the range of the fixing holes 24, and the fasteners 37 are fastened again, thereby fixing the second hopper 16 in any position.

[0025] FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 3 to 6, when the second hopper 16 is attached to the hopper 15, the upstream wall portion 34 of the second hopper 16 overlaps with the downstream wall 18 of the hopper 15 from the downstream side. The upstream wall portion 34 of the second hopper 16 is provided with a protrusion 38 that protrudes downward relative to the gate 25 of the downstream wall 18 .

[0026] The protrusion 38 is formed by the lower end of the plate-shaped upstream wall portion 34. The protrusion 38 is tapered downward, and the width of the protrusion 38 decreases toward the bottom. The protrusion 38 is disposed in the center of the conveyor belt 12d in the width direction. In detail, the protrusion 38 includes a protrusion lower edge 38a constituting the lower end of the protrusion 38, and a pair of protrusion side edges 38b constituting the widthwise side edges of the protrusion 38. The protrusion lower edge 38a is parallel to the upper surface of the conveyor belt 12d. The degree of inclination of one protrusion side edge 38b with respect to the protrusion lower edge 38a is equal to that of the other protrusion side edge 38b.

[0027] The width of the protrusion 38 is smaller than the width of the gate 25, and the protrusion 38 is disposed in the center of the gate 25 in the width direction. When viewed from the downstream side as in Figures 4 and 6, the protrusion 38 overlaps with the gate 25 from the downstream side, and blocks the center of the opening of the gate 25.

[0028] FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. 4 and 7, the second hopper 16 is provided with a second gate 40 on the downstream wall 33 for leveling the upper surface of the cement C to a predetermined height. The second gate 40 is an opening formed by cutting out the downstream wall 33 extending vertically downstream of the cement supply port 36. The second gate 40 is formed by cutting out the lower end of the downstream wall 33 upward.

[0029] The second gate 40 and the protrusion 38 are both disposed at the lower end of the second hopper 16 and at the center of the conveyor belt 12d in the width direction. Therefore, when viewed from the downstream side as in FIG. 4, the second gate 40 overlaps with the protrusion 38 from the downstream side. Moreover, the lower end of the second gate 40 is disposed slightly above the lower edge 38a of the protrusion.

[0030] The second gate 40 is defined by a pair of side edges 40a extending upward perpendicularly to the upper surface of the conveyor belt 12d and an upper edge 40b connecting the upper ends of the pair of side edges 40a in the width direction. The upper edge 40b is tapered so that the center of the second gate 40 is the highest.

[0031] The lid 31 of the second hopper 16 covers the cement inlet 35 (FIG. 5) of the main body 30. The lid 31 is provided with a pair of cylindrical portions 31a arranged side by side in the width direction and penetrating the lid 31. A cement supply hose 41 is connected to one of the cylindrical portions 31a. Cement C is supplied from the cement supply hose 41 to the second hopper 16.

[0032] Here, the transportation of the sand S and cement C by the transportation device 10 will be described. 6 and 7 show guide members 42 disposed on both sides of the conveyor belt 12d. The guide members 42 guide the sand S in the width direction and keep the sand S on the conveyor belt 12d. The guide members 42 are provided continuously in the conveying direction D. The guide members 42 are not shown in FIGS. 1, 2, and 5.

[0033] Referring to FIG. 5, sand S is supplied to the hopper 15 from a sand conveyor belt 43 disposed above the hopper 15 . The sand S received by the hopper 15 falls onto the conveyor belt 12d from the sand supply port 21 (FIG. 3) and is conveyed in the conveying direction D by the conveyor belt 12d.

[0034] 5 and 6, the sand S in the hopper 15 is transported downstream through the gate 25. When passing through the gate 25, the upper surface of the sand S is smoothed by the gate 25 and the protrusion 38. In detail, the upper surface of the sand S that has passed through the gate 25 is leveled by the gate 25 and becomes lower than the upper surface of the sand S in the hopper 15. Moreover, in the center in the width direction, the sand S is leveled by the convex portion 38 that protrudes downward beyond the gate 25. As a result, in the center in the width direction of the sand S, a concave portion S1 recessed by the convex portion 38 is continuously formed in the conveying direction D.

[0035] Next, the sand S with the recesses S1 formed therein passes directly below the second hopper 16 and is transported downstream. The cement C supplied from the cement supply hose 41 to the second hopper 16 drops onto the sand S on the conveyor belt 12d from the cement supply port 36 (FIGS. 4 and 5), and is supplied onto the sand S. The cement supply port 36 is disposed directly above the recess S1 in the sand S and overlaps the recess S1 from above. The width of the cement supply port 36 is smaller than the width of the recess S1. Therefore, the cement C that falls downward from the cement supply port 36 enters the recess S1.

[0036] The cement C in the second hopper 16 is transported downstream through the second gate 40 and exits the second hopper 16. When passing through the second gate 40, the upper and side surfaces of the cement C in the recess S1 are leveled by the second gate 40. That is, the upper surface of the cement C is leveled to a predetermined height by the second gate 40.

[0037] In detail, the cement C is formed into a convex shape along a pair of side edges 40a and an upper edge 40b when it passes through the second gate 40. Since the cement C is formed into a mountain shape by the second gate 40 with the highest part being in the center in the width direction, it is unlikely to crumble during transportation. 2 and 7, the upper surface of the sand S is leveled and a predetermined height of cement C is formed in the recesses S1 of the sand S, and this state is continuously formed in the conveying direction D. Therefore, the sand S and cement C can be conveyed with a uniform ratio of the sand S to the cement C.

[0038] By using the conveying device 10, the sand S and cement C can be supplied to the upper kettle 11a (FIG. 1) of the spraying machine 11 with a uniform ratio of the sand S and the cement C. This improves the efficiency of mixing the sand S and the cement C in the upper kettle 11a, and enables the efficient production of high-quality mortar.

[0039] In addition, the ratio of sand S to cement C can be changed by changing the vertical position of the second hopper 16 relative to the hopper 15. The vertical position of the second hopper 16 can be changed by moving the second hopper 16 in the vertical direction along the fixing holes 24 (FIG. 3). 7, when the second hopper 16 is lowered, the size of the recess S1 increases and the amount of sand S decreases. Even when the second hopper 16 is lowered, the size of the second gate 40 does not change, so the amount of cement C does not change. Therefore, when the second hopper 16 is lowered, the ratio of sand S decreases.

[0040] 7, when the second hopper 16 is raised, the size of the recess S1 becomes smaller and the amount of sand S increases. Even when the second hopper 16 is raised, the size of the second gate 40 does not change, so the amount of cement C does not change. Therefore, when the second hopper 16 is raised, the ratio of sand S increases.

[0041] As described above, according to the first embodiment of the present invention, the conveying device 10 includes the belt conveyor 12 for conveying sand S as a powdery first conveyed object, the gate 25 for leveling the upper surface of the sand S on the belt conveyor 12, and the second hopper 16 as a powder supplying section provided downstream of the gate 25 on the conveying path for supplying cement C as a powdery second conveyed object onto the sand S on the belt conveyor 12. The conveying device 10 is provided with a convex portion 38 protruding downward from the gate 25, and the convex portion 38 forms a concave portion S1 in the center of the width direction of the sand S, and the second hopper 16 supplies cement C to the concave portion S1. According to this configuration, the upper surface of the sand S is leveled by the gate 25, and a recess S1 is formed in the center in the width direction by a convex portion 38 that protrudes downward from the gate 25. The second hopper 16 supplies cement C to the recess S1 of the sand S downstream of the gate 25. This makes it possible to level and homogenize the sand S, and by supplying cement C to the recess S1, it is easy to keep the amount of cement C constant. Therefore, the sand S and cement C can be transported with the ratio of sand S to cement C kept uniform.

[0042] Further, the conveying device 10 is provided with a second gate 40 for leveling the upper surface of the cement C to a predetermined height. According to this configuration, the cement C supplied to the recess S1 is leveled by the second gate 40, so that the ratio of the sand S to the cement C can be made uniform.

[0043] Moreover, the protrusion 38 is provided so that its position can be changed in the up-down direction. According to this configuration, the depth of the recess S1 can be changed by vertically changing the position of the protrusion 38. Therefore, the amount of sand S can be adjusted by the depth of the recess S1, and the ratio of the sand S to the cement C can be changed.

[0044] Further, a hopper 15 is provided for receiving the sand S and supplying it onto the belt conveyor 12. The gate 25 is provided in the hopper 15, and the protrusion 38 is supported by the hopper 15 so that its position can be changed in the vertical direction. According to this configuration, the gate 25 can be provided with a simple structure by utilizing the hopper 15 for the sand S, and the convex portion 38 can be easily supported by utilizing the hopper 15 so that its position can be changed in the vertical direction.

[0045] Moreover, the width of the protrusion 38 decreases toward the bottom. According to this configuration, the width of the recess S1 formed by the protrusion 38 becomes smaller toward the bottom, so that the sand S around the recess S1 is less likely to crumble and the shape of the recess S1 is easily maintained. Therefore, the cement C can be appropriately supplied to the recess S1, and the ratio of the sand S to the cement C can be made uniform.

[0046] The powder supply section is a second hopper 16 that receives the cement C, and the second hopper 16 has a cement supply port 36 that drops the cement C into the recess S1 and a downstream wall portion 33 that extends vertically downstream of the cement supply port 36, and the second gate 40 is an opening cut out of the downstream wall portion 33. According to this configuration, by cutting out the downstream side wall portion 33 of the second hopper 16 for cement C, the second gate 40 can be provided with a simple structure.

[0047] The second hopper 16 also includes an upstream wall portion 34 that extends vertically upstream of the cement supply port 36, and the protrusion 38 is formed at the lower end of the upstream wall portion 34. According to this configuration, the upstream wall portion 34 of the second hopper 16 can be utilized to provide the protrusion 38 with a simple structure.

[0048] Furthermore, the gate 25 is provided in the hopper 15, the second hopper 16 is attached to the hopper 15 so that its position can be changed in the vertical direction, and the amount of protrusion of the convex portion 38 relative to the gate 25 is changed by changing the position of the second hopper 16 up and down. According to this configuration, by changing the position of the second hopper 16 up or down, the amount of protrusion of the convex portion 38 can be changed, and the ratio of the sand S to the cement C can be easily changed.

[0049] [Second embodiment] A second embodiment to which the present invention is applied will be described below with reference to Figures 8 to 11. In this second embodiment, parts configured similarly to the first embodiment are given the same reference numerals and descriptions thereof will be omitted. The second embodiment differs from the first embodiment in that a height adjustment mechanism 255 is provided.

[0050] Fig. 8 is a perspective view of the hopper device 213 in the second embodiment as viewed from above. Fig. 9 is a perspective view of the hopper device 213 as viewed from below. Fig. 10 is a cross-sectional view taken along line XX in Fig. 8. The conveying device 210 includes a belt conveyor 12 (see FIGS. 2 and 10) and a hopper device 213 that supplies sand S and cement C to the belt conveyor 12.

[0051] The hopper device 213 includes a hopper 215 that receives sand S and supplies it to the belt conveyor 12, a second hopper 216 (powder supply section) that receives cement C and supplies it to the belt conveyor 12, and a frame 250 that supports the hopper device 213 on the belt conveyor 12.

[0052] When viewed from above, the hopper 215 is formed in a generally rectangular frame shape that opens upward and downward. The hopper 215 includes a pair of side walls 217 spaced apart in the width direction of the conveying device 210, a downstream wall 218 that connects downstream ends of the side walls 217 in the width direction, and an upstream wall 219 that connects upstream ends of the side walls 217 in the width direction.

[0053] The opening on the top surface of the hopper 215 is a sand inlet 220 through which the sand S is introduced. The opening on the bottom surface of the hopper 215 is a sand supply port 221 (bottom surface opening) through which the sand S falls downward. The hopper 215 is formed in a funnel shape in which the width between a pair of side walls 217 narrows from the sand inlet 220 toward the sand supply port 221. The sand supply port 221 is located at the center of the hopper 215 in the width direction, and is narrower than the sand inlet 220. The hopper 215 is disposed so that the sand supply port 221 overlaps with the conveyor belt 12d from above.

[0054] The hopper 215 is provided with a gate 225 for leveling the upper surface of the sand S, and a protrusion 238 that protrudes downward from the gate 225. The gate 225 is an opening for allowing the sand S in the hopper 215 to flow downstream, and is formed at the lower end of the downstream wall 218. Gate 225 is formed by cutting upward the lower edge of downstream wall 218. In a front view of downstream wall 218 as shown in Fig. 10, gate 225 has a basic shape as a rectangular opening extending elongatedly in the width direction, with its lower edge opening downward. The gate 225 is located at the center in the width direction of the hopper 215 and directly above the conveyor belt 12d. The gate 225 is located downstream of the sand supply port 221.

[0055] The protrusion 238 is formed at the lower end of the downstream wall 218. The protrusion 238 is a plate-like portion that protrudes downward from an upper edge 225a of the gate 225 in the center of the gate 225 in the width direction. The protrusion 238 closes the center in the width direction of the gate 225. For this reason, a pair of gate openings 225b through which the sand S flows downstream in the gate 225 is formed on both outer sides of the protrusion 238 in the width direction. The protrusion 238 is tapered downward, and the width of the protrusion 238 decreases toward the bottom. The protrusion 238 is disposed in the center of the conveyor belt 12d in the width direction.

[0056] In detail, the protrusion 238 includes a protrusion lower edge 238a constituting the lower end of the protrusion 238, and a pair of protrusion side edges 238b constituting the widthwise side edges of the protrusion 238. The protrusion lower edge 238a is parallel to the upper surface of the conveyor belt 12d. The degree of inclination of one protrusion side edge 238b with respect to the protrusion lower edge 238a is equal to that of the other protrusion side edge 238b.

[0057] FIG. 11 is a view of the hopper device 213 as viewed from the downstream side. 8 to 11, the second hopper 216 is in the shape of a substantially rectangular frame that opens upward and downward. The second hopper 216 includes a pair of side walls 232 spaced apart in the width direction of the conveying device 210, a downstream wall 233 that connects downstream ends of the side walls 232 in the width direction, and an upper wall 234 that connects upper ends of the upstream ends of the side walls 232 in the width direction.

[0058] The opening on the top surface of the second hopper 216 is a cement inlet 235 into which the cement C is poured. The opening on the bottom surface of the second hopper 216 is a cement supply port 236 (second opening) through which the cement C drops downward. The second hopper 216 is formed in a funnel shape in which the width between a pair of side walls 232 narrows from the cement inlet 235 toward the cement supply port 236. The cement supply port 236 is located at the center of the second hopper 216 in the width direction, and is narrower than the cement inlet 235.

[0059] An opening is formed at the front end of the second hopper 216 and is defined by the front edge of the upper wall portion 234 and the front edges of the pair of side wall portions 232 . The front end of the second hopper 216 is fixed to the rear surface of the downstream wall 218 of the hopper 215, and extends downstream from the downstream wall 218. The second hopper 216 is fixed to the downstream wall 218 by, for example, welding. The second hopper 216 is longer than the hopper 215 in the conveying direction D and shorter than the hopper 215 in the width direction.

[0060] The lower end portions 232a (FIG. 11) of the pair of side wall portions 232 of the second hopper 216 overlap the pair of convex side edges 238b (FIG. 10) of the hopper 215 from the downstream side. The lower end portions 232a extend downstream from the convex side edges 238b and are connected to the downstream wall portions 233. The lower end portions 232a are tapered like the convex side edges 238b. As shown in FIGS. 10 and 11, when viewed in the transport direction, the lower end of the downstream side wall portion 233 is tapered so as to overlap with the convex portion 238 .

[0061] The second hopper 216 is provided with a second gate 240, which levels the upper surface of the cement C to a predetermined height, on the downstream wall portion 233. The second gate 240 is an opening formed by cutting out the downstream wall portion 233 that extends vertically downstream of the cement supply port 236. The second gate 240 is formed by cutting out the lower end portion of the downstream wall portion 233 upward.

[0062] The second gate 240 is disposed at the lower end of the second hopper 216 and at the center of the conveyor belt 12d in the width direction, and overlaps with the convex portion 238 of the hopper 215 from the downstream side when viewed in the conveying direction. In detail, the second gate 240 is defined by a pair of side edges 240a extending upward perpendicularly to the upper surface of the conveyor belt 12d, and an upper edge 240b connecting the upper ends of the pair of side edges 240a in the width direction. The upper edge 240b is tapered so that the center of the second gate 240 is the highest. The lower end 240c of the second gate 240 is at the same height as the lower edge 238a of the protrusion (FIG. 10), and the upper edge 240b is located above the upper edge 225a of the gate 225 (FIG. 10).

[0063] The frame 250 includes a front frame 251 provided in the second hopper 216, and a rear frame 252 provided behind the front frame 251. The frame 250 is not shown in FIG. The front frame 251 includes a horizontal frame 251a extending from a front end of the second hopper 216 to both outer sides in the width direction, and a pair of vertical frames 251b extending in the up-down direction from the horizontal frame 251a. The rear frame 252 includes a horizontal frame 252a extending from the rear end of the second hopper 216 to both outer sides in the width direction, and a pair of vertical frames 252b extending in the up-down direction from the horizontal frame 252a. The vertical frames 251b and 252b are provided with a plurality of fixing holes 253 arranged in the vertical direction.

[0064] The belt conveyor 12 includes a hopper fastener (not shown) that is fastened to the fixing hole 253 on a stay (not shown) provided on the conveyor frame 12a (FIGS. 1 and 2). The hopper device 213 is fixed to the belt conveyor 12 via the stay (not shown) by the hopper fastener inserted into the fixing hole 253 of the frame 250.

[0065] In detail, the support height of the hopper device 213 is changed by changing the position of the fixing hole 253 through which the hopper fastener is inserted. For example, when the hopper fastener is inserted through the lowermost fixing hole 253 in Fig. 9, the support height of the hopper device 213 is increased, and when the hopper fastener is inserted through the uppermost fixing hole 253 in Fig. 9, the support height of the hopper device 213 is decreased.

[0066] In this way, when the support height of the hopper device 213 is changed, the height H (FIGS. 10 and 11) from the upper surface of the transport belt 12d (upper surface of the belt conveyor 12) to the sand supply port 221 of the hopper 215 is changed. The fixing holes 253 and the hopper fasteners constitute a height adjustment mechanism 255 that supports the hopper device 213 so as to be able to change the height H from the upper surface of the conveyor belt 12d to the sand supply port 221.

[0067] Here, the transportation of the sand S and cement C by the transportation device 210 will be described. 5 and 8 to 10, sand S is supplied to the hopper 215 from a sand belt conveyor 43 disposed above the hopper 215. As shown in FIG. The sand S received by the hopper 215 falls onto the conveyor belt 12d from the sand supply port 221, and is conveyed in the conveying direction D by the conveyor belt 12d.

[0068] The sand S in the hopper 215 is transported downstream through the gate 225. When passing through the gate 225, the upper surface of the sand S is smoothed by the gate 225 and the protrusion 238. In detail, the upper surface of the sand S that has passed through the gate 225 is leveled by the gate 225 and becomes lower than the upper surface of the sand S in the hopper 215. Moreover, in the center in the width direction, the sand S is leveled by the convex portion 238 that protrudes downward beyond the gate 225. As a result, in the center in the width direction of the sand S, a concave portion S2 recessed by the convex portion 238 is continuously formed in the conveying direction D.

[0069] Next, the sand S with the recesses S2 formed therein passes directly below the second hopper 216 and is transported downstream. The cement C supplied to the cement inlet 235 of the second hopper 216 drops from the cement supply port 236 onto the sand S on the conveyor belt 12d, and is supplied onto the sand S. The cement supply port 236 is disposed directly above the recessed portion S2 of the sand S and overlaps the recessed portion S2 from above. The width of the cement supply port 236 is smaller than the width of the recessed portion S2. Therefore, the cement C that falls downward from the cement supply port 236 enters the recessed portion S2.

[0070] The cement C in the second hopper 216 is transported downstream through the second gate 240 and exits the second hopper 216. When passing through the second gate 240, the upper surface and side surfaces of the cement C in the recess S2 are leveled by the second gate 240. That is, the upper surface of the cement C is leveled to a predetermined height by the second gate 240. 2 and 11, the state in which the top surface of the sand S is leveled and a predetermined height of cement C is formed in the recesses S2 of the sand S is continuously formed in the conveying direction D. Therefore, the sand S and cement C can be conveyed with a uniform ratio of the sand S to the cement C.

[0071] In the hopper device 213, the height adjustment mechanism 255 can be used to change the height H from the upper surface of the conveyor belt 12d to the sand supply port 221, thereby adjusting the amount of sand S supplied from the hopper 215 to the conveyor belt 12d. In detail, when the height H is increased, more sand S can be present between the sand supply port 221 and the upper surface of the conveyor belt 12d, and therefore the supply amount of sand S increases. On the other hand, in FIG. 10 where the height H is lowered compared to the state in FIG. 11, the supply amount of sand S decreases.

[0072] Furthermore, in the hopper device 213, when the height H is changed by the height adjustment mechanism 255, the hopper 215 and the second hopper 216 move together, and the height between the convex portion 238 and the second gate 240 does not change. Therefore, even when the height H is changed, the height of the cement C in the concave portion S2 can be kept constant. In the hopper device 213, the ratio of the sand S to the cement C can be changed by changing the amount of the sand S supplied by the height adjustment mechanism 255 while the amount of the cement C is maintained constant.

[0073] As described above, according to the second embodiment of the present invention, the conveying device 210 includes the belt conveyor 12 for conveying the sand S as the powdery first conveyed object, the gate 225 for leveling the upper surface of the sand S on the belt conveyor 12, and the second hopper 216 as a powder supplying section provided downstream of the gate 225 in the conveying path and supplying the cement C as the powdery second conveyed object onto the sand S on the belt conveyor 12. In the conveying device 210, a convex portion 238 protruding downward from the gate 225 is provided, and the convex portion 238 forms a concave portion S2 in the center of the width direction of the sand S, and the second hopper 216 supplies the cement C to the concave portion S2. According to this configuration, the upper surface of the sand S is leveled by the gate 225, and a recess S2 is formed in the center in the width direction by a convex portion 238 that protrudes downward from the gate 225. The second hopper 216 supplies cement C to the recess S2 of the sand S downstream of the gate 225. This makes it possible to level and homogenize the sand S, and by supplying cement C to the recess S2, it is easy to keep the amount of cement C constant. Therefore, the sand S and cement C can be transported with the ratio of sand S to cement C kept uniform.

[0074] The transport device 210 also includes a hopper device 213 including a hopper 215 that receives sand S and supplies sand S onto the belt conveyor 12 from a sand supply port 221 that is an opening on the bottom surface, and a second hopper 216, and the gate 225 and the protrusion 238 are provided on the hopper device 213. The transport device 210 also includes a height adjustment mechanism 255 that supports the hopper device 213 so as to change the height H from the upper surface of the belt conveyor 12 to the sand supply port 221. According to this configuration, the height of the hopper device 213 is changed by the height adjustment mechanism 255, and the height H from the upper surface of the belt conveyor 12 to the sand supply port 221 is changed, so that the amount of sand S supplied from the sand supply port 221 to the belt conveyor 12 can be adjusted. Then, the gate 225 and the convex portion 238 provided in the hopper device 213 level the sand S and form a concave portion S2 in the sand S, and the second hopper 216 can supply cement C to the concave portion S2. This makes it possible to easily adjust the amount of sand S, and to appropriately supply cement C to the concave portion S2 in response to the adjustment of the amount of sand S. Therefore, the ratio of sand S to cement C can be easily changed, and transport can be performed with the ratio of sand S to cement C kept uniform.

[0075] In addition, a second gate 240 for leveling the upper surface of the cement C to a predetermined height is provided in the second hopper 216. According to this configuration, the cement C supplied to the recess S2 is leveled by the second gate 240, so that the ratio of the sand S to the cement C can be made uniform.

[0076] Further, the second hopper 216 is fixed to the hopper 215, and when the height is changed by the height adjustment mechanism 255, the protrusion 238 and the second gate 240 move vertically together. According to this configuration, when the height is changed by the height adjustment mechanism 255, the height between the convex portion 238 and the second gate 240 does not change, so the height of the cement C leveled by the second gate 240 can be kept constant. Therefore, the sand S and the cement C can be transported with the ratio thereof kept constant.

[0077] Furthermore, the second hopper 216 has a cement supply port 236 that drops the cement C into the recess S2 and a downstream wall portion 233 that extends vertically downstream of the cement supply port 236, and the second gate 240 is an opening cut out of the downstream wall portion 233. According to this configuration, by cutting out the downstream side wall portion 233 of the second hopper 216 for cement C, the second gate 240 can be provided with a simple structure.

[0078] Although one embodiment of the present invention has been described above, the present invention is not limited to the specific embodiment, and various modifications and changes are possible within the scope of the spirit of the present invention described in the claims unless otherwise specifically limited in the above description. For example, the configuration of the above-mentioned embodiment can be appropriately added or deleted, and the configuration of one embodiment can be applied to another embodiment. Furthermore, the effects of the above-mentioned embodiment are merely examples of the effects resulting from the present invention, and do not mean that the effects of the present invention are limited to the above-mentioned effects. In the above first embodiment, the protrusion 38 is described as being integral with the upstream wall 34 of the second hopper 16, but the present invention is not limited to this. For example, a plate member that is movable up and down along the downstream wall 18 inside the hopper 15 may be provided as the protrusion, and the recess S1 may be formed by this protrusion. In the above second embodiment, the height adjustment mechanism 255 has been described as being configured by the fixing hole 253 and the hopper fastener, but the structure of the height adjustment mechanism 255 is not particularly limited as long as it is capable of changing the height H. In addition, the hopper device 213 has been described as being supported by the belt conveyor 12 via the height adjustment mechanism 255, but the present invention is not limited to this. For example, a support body placed on the ground may be provided separately from the belt conveyor 12, and the hopper device 213 may be supported by the support body via the height adjustment mechanism. [Explanation of symbols]

[0079] 10,210:Transportation device 12: Conveyor belt 15,215:Hopper 16,216: Second hopper (powder supply section) 25,225:Gate 33,233: Downstream wall 34: Upstream wall 36: Cement supply port (supply port) 38,238: Convex 40,240: Second Gate 213: Hopper device 221: Sand supply port (opening on the bottom) 236: Cement supply port (second opening) 255: Height adjustment mechanism C: Cement (second conveyed object) H: Height S: Sand (first transport object) S1, S2: Concave

Claims

1. a belt conveyor for conveying a powder-like first transported object, a gate for leveling an upper surface of the first transported object on the belt conveyor, and a powder supplying unit provided downstream of the gate on a transport path for supplying a powder-like second transported object onto the first transported object on the belt conveyor, a protrusion protruding downward from the gate, the protrusion forming a recess in a central portion in a width direction of the first transported object, The powder supply unit is a conveying device that supplies the second conveyed object to the recess.

2. 2. The transport apparatus according to claim 1, further comprising a second gate for leveling an upper surface of the second transported object to a predetermined height.

3. The conveying device according to claim 1 , wherein the protrusion is provided so that its position can be changed in the vertical direction.

4. a hopper is provided to receive the first transported object and supply it onto the belt conveyor; The conveying device according to claim 3 , wherein the gate is provided in the hopper, and the protrusion is supported by the hopper so that its position can be changed in the vertical direction.

5. 5. The conveying device according to claim 1, wherein the width of the protrusion decreases downward.

6. the powder supplying section is a second hopper that receives the second transported object, the second hopper including a supply port that drops the second transported object into the recess, and a downstream wall portion that extends vertically downstream of the supply port; The transport device according to claim 2 , wherein the second gate is an opening formed by cutting out the downstream wall portion.

7. The second hopper includes an upstream wall portion extending vertically upstream of the supply port, The conveying device according to claim 6 , wherein the protrusion is formed on a lower end of the upstream wall portion.

8. a hopper is provided to receive the first transported object and supply it onto the belt conveyor; The gate is provided in the hopper, The conveying device according to claim 7, wherein the second hopper is attached to the hopper so that its position can be changed in the vertical direction, and the amount by which the convex portion protrudes relative to the gate is changed by changing the position of the second hopper up or down.

9. a hopper device including a hopper that receives the first transported object and supplies the first transported object onto the belt conveyor from an opening on a lower surface thereof, and the powder supply unit; The gate and the protrusion are provided on the hopper device, The conveying device according to claim 1 , further comprising a height adjustment mechanism for supporting the hopper device so as to change the height from an upper surface of the belt conveyor to the opening.

10. 10. The conveying device according to claim 9, further comprising a second gate provided in the powder supplying section for leveling an upper surface of the second conveyed object to a predetermined height.

11. The conveying device according to claim 10 , wherein the powder supplying unit is fixed to the hopper, and the convex portion and the second gate move vertically together when the height is changed by the height adjustment mechanism.

12. the powder supplying section is a second hopper that receives the second transported object, the second hopper including a second opening through which the second transported object is dropped into the recess, and a downstream wall portion extending vertically downstream of the second opening; The transport device according to claim 11 , wherein the second gate is an opening formed by cutting out the downstream wall portion.

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