Grain Metering Device

Abstract

Close the shutter properly. [Solution] In a grain weighing device, a small shutter 40 below a small measuring cylinder 34A is opened and closed to discharge grain from a tank and weigh the grain on a scale. When the small shutter 40 is closed, the movable recessed portion 44A and movable protruding portion 44B of the movable irregularities 44 of the small shutter 40 are brought close to the fixed protruding portion 38B and fixed recessed portion 38A of the fixed irregularities 38 of the small measuring cylinder 34A, respectively. This allows the grain to move along the gap between the movable recessed portion 44A and the fixed protruding portion 38B and the gap between the movable protruding portion 44B and the fixed recessed portion 38A, preventing the grain from becoming caught between the movable irregularities 44 and the fixed irregularities 38, and allowing the small shutter 40 to close properly.

Description

[Technical Field]

[0001] The present invention relates to a grain weighing device that weighs grain discharged from a tank. [Background technology]

[0002] In the soybean weighing device described in Patent Document 1 below, soybeans are stored in a tank, and a shutter is closed to restrict the discharge of the soybeans from the open end of the tank, and the shutter is opened to discharge the soybeans from the open end of the tank. Furthermore, a weighing scale weighs the soybeans discharged from the open end of the tank.

[0003] In this soybean weighing device, an elastic plate is attached to the open end of the tank, and when the shutter is closed, the elastic plate bends. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 11-248522 Summary of the Invention [Problem to be solved by the invention]

[0005] In consideration of the above, an object of the present invention is to provide a grain weighing device that can properly close the shutter. [Means for solving the problem]

[0006] A grain weighing device of a first aspect of the present invention comprises a tank for storing grain, a shutter provided with a first irregularity having a first recess and a first protrusion, a second irregularity provided on the tank side and having a second recess and a second protrusion, wherein when the shutter is closed, the first recess and the first protrusion approach the second protrusion and the second recess respectively, thereby restricting the discharge of grain from the tank, and when the shutter is opened, the first recess and the first protrusion move away from the second protrusion and the second recess respectively, thereby discharging grain from the tank, and a weighing mechanism for weighing the grain discharged from the tank.

[0007] A grain weighing device according to a second aspect of the present invention is the grain weighing device according to the first aspect of the present invention, an arrangement direction of the first recesses and the first protrusions and an arrangement direction of the second recesses and the second protrusions are set to a predetermined direction, and The first recess and the first protrusion are respectively connected to the second protrusion and the second recess. In the predetermined direction It is shifted.

[0008] A grain weighing device of a third aspect of the present invention comprises a tank for storing grain, a shutter having a first irregularity in which a first recess and a first protrusion are provided, a third irregularity provided on the tank side and having a third recess and a third protrusion, wherein when the shutter is closed, the first recess and the first protrusion fit into the third protrusion and the third recess, respectively, thereby restricting the discharge of grain from the tank, and when the shutter is opened, the first recess and the first protrusion move away from the third protrusion and the third recess, respectively, thereby discharging grain from the tank, and a weighing mechanism for weighing the grain discharged from the tank.

[0009] A fourth aspect of the grain weighing device of the present invention comprises a tank for storing grain, a connecting tube connected to the tank, a shutter that closes the inside of the connecting tube and restricts the discharge of grain from the tank through the connecting tube when closed, and opens the inside of the connecting tube and allows the discharge of grain from the tank through the connecting tube when opened, a restricting section that is provided on the inner periphery of the connecting tube and is positioned above the shutter and restricts the grain from contacting the outer periphery of the shutter, and a weighing mechanism that weighs the grain discharged from the tank. [Effects of the Invention]

[0010] In a grain weighing device according to a first aspect of the present invention, grain is stored in a tank. A first concave-convex portion is provided on the shutter, and a second concave-convex portion is provided on the tank. When the shutter is closed, the first concave-convex portion and the first convex portion of the first concave-convex portion are respectively brought close to the second convex-convex portion and the second concave portion of the second concave-convex portion, thereby restricting the discharge of grain from the tank. When the shutter is opened, the first concave-convex portion and the first convex portion are respectively moved away from the second convex-convex portion and the second concave portion, thereby discharging grain from the tank. A weighing mechanism weighs the grain discharged from the tank.

[0011] As described above, when the shutter is closed, the first recess and the first protrusion are brought close to the second protrusion and the second recess, respectively, so that the grains can move along the gap between the first recess and the second protrusion and the gap between the first protrusion and the second recess, preventing the grains from being caught between the first protrusion and the second protrusion, and allowing the shutter to be closed appropriately.

[0012] In the grain weighing device according to the second aspect of the present invention, an arrangement direction of the first recesses and the first protrusions and an arrangement direction of the second recesses and the second protrusions are set to a predetermined direction; The first recess and the first protrusion are respectively connected to the second protrusion and the second recess. In a given direction Therefore, when the first recess and the first protrusion are brought close to the second protrusion and the second recess, respectively, the grains are prevented from remaining at the bottom of the first recess and the second recess, which further prevents the grains from being caught between the first protrusion and the second protrusion, allowing the shutter to close more appropriately.

[0013] In a grain weighing device according to a third aspect of the present invention, grain is stored in a tank. A first concave-convex portion is provided on the shutter, and a third concave-convex portion is provided on the tank. When the shutter is closed, the first concave-convex portion and the first convex portion of the first concave-convex portion fit into the third convex-convex portion and the third concave portion of the third concave-convex portion, respectively, so that the shutter restricts the discharge of grain from the tank. When the shutter is opened, the first concave-convex portion and the first convex portion are separated from the third convex-convex portion and the third concave portion, respectively, so that the grain is discharged from the tank. A weighing mechanism weighs the grain discharged from the tank.

[0014] As described above, when the shutter is closed, the first recess and the first convex portion are fitted into the third convex portion and the third recess, respectively. Therefore, when grain is supplied to the empty tank, leakage of grain from between the first and third convex portions can be prevented, and the shutter can be closed appropriately.

[0015] In a fourth aspect of the grain weighing device of the present invention, grain is stored in a tank. A connecting tube is connected to the tank, and when a shutter is closed, the shutter closes the connecting tube and restricts the discharge of grain from the tank through the connecting tube. When the shutter is opened, the shutter opens the connecting tube and the grain is discharged from the tank through the connecting tube. A weighing mechanism weighs the grain discharged from the tank.

[0016] The limiting portion on the inner periphery of the connecting tube is located above the shutter, and the limiting portion limits the grain from contacting the outer periphery of the shutter, preventing the grain from becoming caught between the shutter and the connecting tube and allowing the shutter to close properly. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a perspective view showing a grain weighing device according to an embodiment of the present invention, viewed diagonally from the front left. [Figure 2] FIG. 2 is a front view showing the grain weighing device. [Figure 3]FIG. 2 is a right side view showing the grain weighing device as viewed from the right. [Figure 4] FIG. 2 is a cutaway perspective view showing the tank of the grain weighing device as seen from diagonally front left. [Figure 5] 3 is a perspective view showing the switching cylinder, left shutter, and right shutter of the grain weighing device, as seen from diagonally front right. FIG. [Figure 6] FIG. 4 is a perspective view showing the inside of the switching cylinder as viewed obliquely from the front right. [Figure 7] (A) and (B) are diagrams showing the switching cylinder, left shutter, and right shutter, where (A) is a cross-sectional view seen from the front (cross-sectional view at plane 7A in FIG. 5), and (B) is a cross-sectional view seen from the right (cross-sectional view at plane 7B in FIG. 5). [Figure 8] (A) and (B) are oblique views from the front and diagonally downward showing the weighing shutter of the grain weighing device, where (A) shows the weighing shutter in a closed state and (B) shows the weighing shutter in the process of being closed. [Figure 9] (A) and (B) are cross-sectional views showing the metering shutter as seen from the front, where (A) shows the metering shutter in a closed state and (B) shows the metering shutter in an open state. [Figure 10] 10A is a bottom view showing the metering shutter in a closed state, and FIG. 10B is an enlarged view of region 10B in FIG. [Figure 11] 11A is a bottom view seen from below showing the metering shutter in the middle of being closed, and FIG. 11B is an enlarged view of region 11B in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] Fig. 1 shows a perspective view of a grain weighing device 10 according to an embodiment of the present invention as seen diagonally from the front left. Furthermore, Fig. 2 shows a front view of the grain weighing device 10 as seen from the front, and Fig. 3 shows a right side view of the grain weighing device 10 as seen from the right. In the drawings, the front of the grain weighing device 10 is indicated by an arrow FR, the right side of the grain weighing device 10 is indicated by an arrow RH, and the upward direction is indicated by an arrow UP.

[0019] As shown in FIGS. 1 to 3, the grain weighing device 10 according to this embodiment is provided with a rectangular parallelepiped support frame 12 as a support body.

[0020] A tank 14 (see Figure 4), which is a substantially rectangular box, is supported on the upper end of the support frame 12, and the lower portion of the tank 14 is shaped like an inverted quadrangular pyramid, tapering downward. A partition plate 16 is fixed to the center of the tank 14 in the left-right direction and is disposed vertically in the left-right direction. The partition plate 16 divides the tank 14 in the left-right direction, with the left portion of the tank 14 designated as a left tank 14A and the right portion of the tank 14 designated as a right tank 14B.

[0021] Elevators 18 are provided at the rear of the left and right portions of the grain weighing device 10, respectively, as supply mechanisms. The elevators 18 extend vertically from the lower end of the support frame 12 to a position above the tank 14. A hopper 18A shaped like an inverted truncated square pyramid is fixed to the rear of the lower end of the elevator 18. Grain (e.g., rice, wheat, or soybeans) is loaded into the hopper 18A from above, and the grain is moved upward by the elevator 18. As a result, grain loaded into the left hopper 18A is supplied to and stored in the left tank 14A by the left elevator 18, and grain loaded into the right hopper 18A is supplied to and stored in the right tank 14B by the right elevator 18. The grain loaded into the left tank 14A and the grain loaded into the right tank 14B may be the same type or different types (including differences in the diameter and quality of grain G (see FIG. 11(B))).

[0022] A rectangular switching cylinder 20 (see Figures 5, 6, 7A and 7B) is fixed to the underside of the tank 14, and a switching plate 22 is fixed to the center in the left-right direction inside the switching cylinder 20. The switching plate 22 is arranged vertically in the left-right direction and divides the inside of the switching cylinder 20 in the left-right direction, with the left part of the switching cylinder 20 being a left switching cylinder 20A that serves as a connecting cylinder, and the right part of the switching cylinder 20 being a right switching cylinder 20B that also serves as a connecting cylinder. The switching plate 22 is connected to the partition plate 16 inside the tank 14, and the inside of the left switching cylinder 20A is connected to the inside of the left tank 14A, and the inside of the right switching cylinder 20B is connected to the inside of the right tank 14B.

[0023] Limiting plates 24 serving as limiting portions are fixed to the entire inner peripheries of the left switching barrel 20A and the right switching barrel 20B, with the upper ends of the limiting plates 24 fixed to the side walls of the left switching barrel 20A or the right switching barrel 20B, and the lower ends of the limiting plates 24 positioned flush with the lower ends of the left switching barrel 20A or the right switching barrel 20B. The upper portions of the front and rear limiting plates 24 are inclined downward as they move inward in the front-to-rear direction of the left switching barrel 20A or the right switching barrel 20B, and the lower portions are positioned vertically in the front-to-rear direction. The left and right limiting plates 24 are inclined downward as they move inward in the left-to-right direction of the left switching barrel 20A or the right switching barrel 20B.

[0024] A left shutter 26 and a right shutter 28, each shaped like a substantially rectangular plate, are disposed below the left switching cylinder 20A and the right switching cylinder 20B, respectively, and are slidable in the front-to-rear direction. The left shutter 26 and the right shutter 28 are slid forward and closed to close the underside of the left switching cylinder 20A and the underside of the right switching cylinder 20B, respectively. The left shutter 26 restricts the discharge of grain from the left tank 14A through the left switching cylinder 20A, and the right shutter 28 restricts the discharge of grain from the right tank 14B through the right switching cylinder 20B. The left shutter 26 and the right shutter 28 are slid rearward and opened to open the underside of the left switching cylinder 20A and the underside of the right switching cylinder 20B, respectively. When the left shutter 26 is opened, the grain in the left tank 14A is discharged through the left switching cylinder 20A, and when the right shutter 28 is opened, the grain in the right tank 14B is discharged through the right switching cylinder 20B.

[0025] The grain in the left switching cylinder 20A and the grain in the right switching cylinder 20B cannot pass through the gap between the limiting plate 24 in the left switching cylinder 20A and the left shutter 26, and between the limiting plate 24 in the right switching cylinder 20B and the right shutter 28, respectively. The limiting plate 24 in the left switching cylinder 20A prevents the grain in the left switching cylinder 20A from contacting the outer periphery of the left shutter 26, and the limiting plate 24 in the right switching cylinder 20B prevents the grain in the right switching cylinder 20B from contacting the outer periphery of the right shutter 28.

[0026] A substantially rectangular intermediate cylinder 30 is fixed to the lower side of the switching cylinder 20, and the interior of the intermediate cylinder 30 is in communication with the interior of the switching cylinder 20 (the interior of the left switching cylinder 20A and the interior of the right switching cylinder 20B).

[0027] A measuring shutter 32 (see FIGS. 8A and 8B and FIGS. 9A and 9B) is provided below the intermediate cylinder 30, and a metal, substantially rectangular measuring cylinder 34 is provided on the measuring shutter 32. The measuring cylinder 34 is connected to the lower side of the intermediate cylinder 30, and the inside of the measuring cylinder 34 is connected to the inside of the intermediate cylinder 30. The lower portions of the left and right walls of the measuring cylinder 34 are inclined inward in the left-right direction of the measuring cylinder 34 as they go downward.

[0028] A metal separator plate 36 having a generally inverted V-shaped cross section is fixed to the left-right middle of the lower part of the measuring cylinder 34, and the separator plate 36 divides the lower part of the measuring cylinder 34 in the left-right direction. The portion of the left wall of the separator plate 36 other than the lower part is inclined leftward as it extends downward, and the lower part of the left wall of the separator plate 36 is disposed vertically in the left-right direction. The portion of the right wall of the separator plate 36 other than the lower end part is inclined rightward as it extends downward, and the lower end part of the right wall of the separator plate 36 is disposed vertically in the left-right direction.

[0029] The lower portion of the measuring cylinder 34 is made into a small measuring cylinder 34A on the left side of the separator plate 36 (including the left wall of the separator plate 36), and is made into a large measuring cylinder 34B on the right side of the separator plate 36 (including the right wall of the separator plate 36), and the left-right dimensions of the upper and lower ends of the small metering cylinder 34A are smaller than the left-right dimensions of the upper and lower ends of the large metering cylinder 34B, respectively. The lower ends of the front and rear walls of the small metering cylinder 34A are positioned below the left and right walls of the small metering cylinder 34A and are curved convexly downward in the left-right direction, and the lower ends of the front and rear walls of the large metering cylinder 34B are positioned below the left and right walls of the large metering cylinder 34B and are curved convexly downward in the left-right direction.

[0030] Fixed irregularities 38 serving as second irregularities are formed on the lower ends of the right wall of the small metering cylinder 34A and the left wall of the large metering cylinder 34B, and a plurality of fixed recesses 38A serving as second recesses and fixed protrusions 38B serving as second protrusions are provided on the fixed irregularities 38. The fixed recesses 38A and the fixed protrusions 38B are arranged alternately in the front-to-rear direction, and the inner periphery of the fixed recesses 38A and the outer periphery of the fixed protrusions 38B are V-shaped.

[0031] A metal, substantially rectangular small shutter 40 is disposed below the small measuring cylinder 34A, and the small shutter 40 is curved downward in a convex shape in the left-right direction and is disposed along the lower ends of the front and rear walls of the small measuring cylinder 34A. The upper sides of the front and rear ends of the small shutter 40 are supported by the measuring cylinder 34 so as to be rotatable in the left-right direction, and the direction of curvature of the small shutter 40 is aligned with the rotation direction of the small shutter 40. When closed, the small shutter 40 closes off the lower side of the small measuring cylinder 34A, and the small shutter 40 restricts grain discharged from the switching cylinder 20 (the left switching cylinder 20A or the right switching cylinder 20B) through the intermediate cylinder 30 into the measuring cylinder 34 from being discharged downward from the small measuring cylinder 34A. When the small shutter 40 is rotated to the left, the small shutter 40 is opened to open the bottom of the small measuring cylinder 34A, allowing the grain to be discharged downward from the small measuring cylinder 34A.

[0032] A large shutter 42 made of metal and shaped like a substantially rectangular plate is disposed below the large measuring cylinder 34B, and the large shutter 42 is curved downward in a convex shape in the left-right direction and is disposed along the lower ends of the front and rear walls of the large measuring cylinder 34B. The upper sides of the front and rear ends of the large shutter 42 are supported by the measuring cylinder 34 so as to be rotatable in the left-right direction, and the direction of curvature of the large shutter 42 is aligned with the rotation direction of the large shutter 42. When closed, the large shutter 42 closes off the lower side of the large measuring cylinder 34B, and the large shutter 42 restricts grain discharged from the switching cylinder 20 (inside the left switching cylinder 20A or the right switching cylinder 20B) through the intermediate cylinder 30 into the measuring cylinder 34 from being discharged downward from the large measuring cylinder 34B. When the large shutter 42 is rotated to the right, the large shutter 42 is opened to open the bottom of the large measuring cylinder 34B, allowing the grain to be discharged downward from the large measuring cylinder 34B. The amount of grain discharged from the large measuring cylinder 34B is greater than the amount of grain discharged from the small measuring cylinder 34A.

[0033] The right end of the small shutter 40 and the left end of the large shutter 42 are formed with moving irregularities 44 as first and third irregularities, and the moving irregularities 44 are provided with a plurality of moving recesses 44A as first and third recesses and a plurality of moving protrusions 44B as first and third protrusions. The moving recesses 44A and the moving protrusions 44B are alternately arranged in the front-to-rear direction, and the inner periphery of the moving recesses 44A and the outer periphery of the moving protrusions 44B are V-shaped. The moving recesses 44A and the moving protrusions 44B of the moving irregularities 44 of the small shutter 40 and the moving protrusions 44B and the moving recesses 44A of the moving irregularities 44 of the large shutter 42 are aligned in the front-to-rear direction and fit together, thereby restricting grain from being discharged downward from between the small shutter 40 and the large shutter 42 (see FIGS. 10A and 10B).

[0034] The movable recess 44A and the movable protrusion 44B have the same shapes as the fixed recess 38A and the fixed protrusion 38B of the small metering cylinder 34A and the large metering cylinder 34B (fixed protrusions 38), respectively, and when the small shutter 40 is opened or closed, the movable recess 44A and the movable protrusion 44B of the small shutter 40 pass close to the fixed protrusion 38B and the fixed recess 38A of the small metering cylinder 34A, respectively, and when the large shutter 42 is opened or closed, the movable recess 44A and the movable protrusion 44B of the large shutter 42 pass close to the fixed protrusion 38B and the fixed recess 38A of the large metering cylinder 34B, respectively. In addition, the movable recess 44A and the movable protrusion 44B, and the fixed protrusion 38B and the fixed recess 38A are each arranged with a shift in the front-to-back direction of 1 / 4 of the placement interval of the movable recess 44A (the same as the placement interval of the movable protrusion 44B, the placement interval of the fixed recess 38A, and the placement interval of the fixed protrusion 38B).

[0035] An outer cylinder 46 is fixed to the lower side of the intermediate cylinder 30, and the measuring shutter 32 is disposed inside the outer cylinder 46. The inside of the outer cylinder 46 is open to the bottom, and grain discharged downward from the measuring cylinders 34 (small measuring cylinder 34A and large measuring cylinder 34B) of the measuring shutter 32 is discharged below the outer cylinder 46.

[0036] A scale 48 serving as a weighing mechanism is disposed below the outer cylinder 46, and the scale 48 is placed on the installation surface of the support frame 12. A flexible container bag (not shown) serving as a bag body can be set on the scale 48, and when the flexible container bag is set on the scale 48, the flexible container bag is placed on the upper side of the scale 48, and the upper part of the flexible container bag is hooked onto the support frame 12, opening the interior of the flexible container bag to the upper side. As a result, the grain discharged to the lower side of the outer cylinder 46 is stored in the flexible container bag, and the scale 48 measures the weight of the grain in the flexible container bag.

[0037] A control device 50 (operation device) is attached to the lower part of the support frame 12, and the control device 50 can be operated by a user of the grain weighing device 10.

[0038] Next, the operation of this embodiment will be described.

[0039] In the grain weighing device 10 configured as described above, when grain is thrown into the hopper 18A of the left elevator 18, the left elevator 18 supplies the grain to and stores it in the left tank 14A of the tank 14. Also, when grain is thrown into the hopper 18A of the right elevator 18, the right elevator 18 supplies the grain to and stores it in the right tank 14B of the tank 14.

[0040] Furthermore, the left shutter 26 below the left switching cylinder 20A of the switching cylinder 20 is closed, restricting the discharge of grain from the left tank 14A through the left switching cylinder 20A. Also, the right shutter 28 below the right switching cylinder 20B of the switching cylinder 20 is closed, restricting the discharge of grain from the right tank 14B through the right switching cylinder 20B. When the left shutter 26 is opened, grain from the left tank 14A is discharged from the left switching cylinder 20A through the intermediate cylinder 30 into the measuring cylinder 34. On the other hand, when the right shutter 28 is opened, grain from the right tank 14B is discharged from the right switching cylinder 20B through the intermediate cylinder 30 into the measuring cylinder 34. Therefore, the grain discharged into the measuring cylinder 34 is selected from the grain in the left tank 14A and the grain in the right tank 14B.

[0041] In addition, a small shutter 40 below the small measuring tube 34A of the measuring tube 34 is closed to restrict the discharge of grain downward from the small measuring tube 34A, and a large shutter 42 below the large measuring tube 34B of the measuring tube 34 is closed to restrict the discharge of grain downward from the large measuring tube 34B.

[0042] When the grain weighing device 10 is operated for weighing, the flexible container bag is set on the scale 48, and the control device 50 is operated to set the set weight (the weight of grain to be stored in the flexible container bag).

[0043] Then, when the control device 50 is operated to start the weighing operation of the grain weighing device 10, the small shutter 40 and the large shutter 42 are opened under the control of the control device 50, and the grain is discharged downward from the small measuring cylinder 34A and the large measuring cylinder 34B. As a result, the grain discharged downward from the small measuring cylinder 34A and the large measuring cylinder 34B is discharged below the outer cylinder 46 and stored in the flexible container bag. In addition, the scale 48 measures the weight of the grain in the flexible container bag.

[0044] When the weight of grain in the flexible container bag measured by scale 48 becomes a predetermined weight less than the set weight, large shutter 42 is closed under the control of control device 50, and the discharge of grain downward from large measuring cylinder 34B is stopped. As a result, the grain that has been discharged downward from small measuring cylinder 34A is discharged below outer cylinder 46 and stored in the flexible container bag.

[0045] When the weight of the grain in the flexible container bag measured by the scale 48 reaches the set weight, the small shutter 40 is closed under the control of the control device 50, and the discharge of grain downward from the small measuring cylinder 34A is stopped. As a result, the weight of the grain in the flexible container bag reaches the set weight.

[0046] Here, the limiting plates 24 on the inner peripheries of the left switching cylinder 20A and the right switching cylinder 20B are positioned above the outer peripheries of the left shutter 26 and the right shutter 28, respectively, and the limiting plates 24 on the left switching cylinder 20A and the right switching cylinder 20B limit the contact of grain with the outer peripheries of the left shutter 26 and the right shutter 28, respectively. Therefore, even if the left switching cylinder 20A and the right switching cylinder 20B are filled with grain and do not flow, and the pressure due to the grain in the left switching cylinder 20A and the right switching cylinder 20B is large, when the left shutter 26 and the right shutter 28 are opened and closed, the grain is prevented from being drawn between the left shutter 26 and the left switching cylinder 20A and between the right shutter 28 and the right switching cylinder 20B, respectively (even if grain is drawn in, the amount of grain drawn in can be kept small), and the grain is prevented from being caught between the left shutter 26 and the left switching cylinder 20A and between the right shutter 28 and the right switching cylinder 20B, so the left shutter 26 and the right shutter 28 can be opened and closed appropriately (smoothly).

[0047] Furthermore, fixed recesses 38A and fixed protrusions 38B of the fixed irregularities 38 are provided at the lower ends of the right wall of the small metering cylinder 34A and the left wall of the large metering cylinder 34B, and movable recesses 44A and movable protrusions 44B of the movable irregularities 44 are provided at the right end of the small shutter 40 and the left end of the large shutter 42, so that when the small shutter 40 and the large shutter 42 are closed, the movable recesses 44A and movable protrusions 44B approach the fixed protrusions 38B and fixed recesses 38A, respectively (see FIGS. 11A and 11B). Therefore, regardless of the diameter of the kernels G, the kernels can move along the gaps between the movable recesses 44A and fixed protrusions 38B and between the movable protrusions 44B and fixed recesses 38A, preventing the kernels from getting caught between the movable protrusions 44 and the fixed protrusions 38, and allowing the small shutter 40 and the large shutter 42 to be closed appropriately. This prevents the grain from being pinched between the moving unevenness 44 and the fixed unevenness 38 and being damaged. Furthermore, when the grain is pinched between the moving unevenness 44 and the fixed unevenness 38, the gap between the moving unevenness 44 and the fixed unevenness 38 becomes larger, which prevents the grain from leaking out from between the moving unevenness 44 and the fixed unevenness 38, and allows for stable weighing of the grain stored in the flexible container bag. Moreover, because the moving unevenness 44 and the fixed unevenness 38 are made of metal, unlike when the moving unevenness 44 and the fixed unevenness 38 are made of rubber or resin, it is possible to prevent the hassle of replacing parts due to wear, deterioration, deformation, etc. of the moving unevenness 44 and the fixed unevenness 38 and to prevent broken pieces of the moving unevenness 44 and the fixed unevenness 38 from getting mixed in with the grain.

[0048] Furthermore, the movable recessed portion 44A and the movable convex portion 44B are offset in the front-to-rear direction relative to the fixed convex portion 38B and the fixed concave portion 38A, respectively. Therefore, when the movable recessed portion 44A and the movable convex portion 44B approach the fixed convex portion 38B and the fixed concave portion 38A, respectively, the grain is prevented from remaining at the bottom of the movable recessed portion 44A and the fixed concave portion 38A, which further prevents the grain from being caught between the movable convex portion 44 and the fixed concave portion 38A, allowing the small shutter 40 and the large shutter 42 to close more appropriately.

[0049] Furthermore, when the small shutter 40 and the large shutter 42 are closed, the movable recess 44A and movable protrusion 44B of the small shutter 40 fit into the movable protrusion 44B and movable recess 44A of the large shutter 42, respectively. Therefore, when grain is supplied to the empty measuring cylinder 34, even if the diameter of the grain G is small, such as rice or wheat, it is possible to prevent the grain from leaking out between the movable protrusions 44 of the small shutter 40 and the movable protrusions 44 of the large shutter 42, and the small shutter 40 and the large shutter 42 can be closed appropriately. This makes it possible to widen the range of grains that can be weighed by the grain weighing device 10 (range of diameters of the grain G), thereby increasing the versatility of the grain weighing device 10. [Explanation of symbols]

[0050] 10 Grain weighing device 14 Tank 20A Left switching tube (connection tube) 20B Right switching tube (connecting tube) 26 Left shutter (shutter) 28 Right shutter (shutter) 38 Fixed unevenness (second unevenness) 38A Fixed recess (second recess) 38B Fixed convex part (second convex part) 40 Small shutter (shutter) 42 Large Shutter (Shutter) 44 Moving unevenness (1st unevenness, 3rd unevenness) 44A Moving recess (first recess, third recess) 44B Moving convex part (first convex part, third convex part) 48 Scales (measuring mechanisms)

Claims

1. a tank in which the grain is stored; a shutter provided with a first concave-convex structure in which a first concave portion and a first convex portion are provided; a second concave / convex portion provided on the tank side and having a second concave portion and a second convex portion, wherein when the shutter is closed, the first concave portion and the first convex portion approach the second convex portion and the second concave portion, respectively, so that the shutter restricts the discharge of grain from the tank, and when the shutter is opened, the first concave portion and the first convex portion move away from the second convex portion and the second concave portion, respectively, so that the grain is discharged from the tank; a weighing mechanism for weighing the grain discharged from the tank; A grain weighing device comprising:

2. A grain weighing device as described in claim 1, wherein the arrangement direction of the first recess and the first convex portion and the arrangement direction of the second recess and the second convex portion are set to a predetermined direction, and the first recess and the first convex portion are respectively shifted in the predetermined direction relative to the second convex portion and the second recess.

3. a tank in which the grain is stored; a shutter provided with a first concave-convex structure in which a first concave portion and a first convex portion are provided; a third concave / convex portion provided on the tank side and having a third concave portion and a third convex portion, wherein when the shutter is closed, the first concave portion and the first convex portion fit into the third convex portion and the third concave portion, respectively, so that the shutter restricts the discharge of grain from the tank, and when the shutter is opened, the first concave portion and the first convex portion move away from the third convex portion and the third concave portion, respectively, so that the grain is discharged from the tank; a weighing mechanism for weighing the grain discharged from the tank; A grain weighing device comprising:

4. a tank in which the grain is stored; a connecting tube connected to the tank; a shutter that, when closed, closes the inside of the connecting cylinder to restrict the discharge of grain from the tank through the connecting cylinder, and, when opened, opens the inside of the connecting cylinder to allow the discharge of grain from the tank through the connecting cylinder; a limiting portion provided on an inner periphery of the connecting tube and disposed above the shutter, the limiting portion limiting contact of grain with an outer periphery of the shutter; a weighing mechanism for weighing the grain discharged from the tank; A grain weighing device comprising:

Images