JP6836785B2 - Multi-feeder - Google Patents

Description

The present invention relates to, for example, a multi-feeder for smoothly discharging and supplying a material in a large silo.

Conventionally, in a large silo (for example, 8 m in diameter), when a powder or granular material such as wood chips is quantitatively discharged from the lower part of the silo, for example, a hopper is provided below the storage tank constituting the silo, and a plurality of hoppers are provided on the bottom plate of the hopper. A so-called multi-feeder has been proposed in which openings are provided, small feeders are connected below these openings, and the powder or granular material material charged into the storage tank is quantitatively discharged downward by the small feeder. (Patent Document 1).

This multi-feeder has a central rotary blade that extends radially along the bottom plate on the bottom plate, and in the process of the quantitative discharge, the central rotary blade is rotated to form a powder or granular material in a storage tank. Is discharged into a small feeder to minimize the residual powder or granular material in the storage tank.

Japanese Unexamined Patent Publication No. 2016-216258

By the way, in the conventional multi-feeder, when the powder or granular material is put in the storage tank up to the vicinity of the upper end thereof and the small feeder at the lower part is driven to perform the quantitative discharge operation, the hopper is used. Since the powder or granular material material located on the upper side of the small feeder of the bottom plate is discharged first, in the powder or granular material material M in the storage tank, a large hole 30 of the material is formed in the central portion of the storage tank. There is a tendency for the powder or granular material to remain in the circumferential direction along the inner peripheral surface of the storage tank (see FIG. 7). For example, when the powder or granular material is a strip-shaped material such as wood chips, this tendency is observed because the materials tend to be entangled with each other in the circumferential direction in the storage tank.

This tendency is that when the powder or granular material is continuously replenished and charged into the storage tank in the multi-feeder, the material in the central part of the storage tank first descends and is discharged from the small feeder, and the storage tank. There is a problem that the powder or granular material material located near the inner peripheral surface of the water tank stays in the storage tank for a relatively long time.

In the present invention, by providing a partition plate in the storage tank, the partition plate divides the entanglement of the powder or granular material material in the storage tank in the circumferential direction, and prevents the powder or granular material material from staying in the storage tank. , The purpose is to smoothly discharge the powder or granular material.

In order to achieve the above object, the present invention
First, a cylindrical storage tank for storing the powder and granule material is provided, and the storage tank is composed of an upper cylindrical body, a hopper portion connected to the upper cylindrical body, and a lower cylindrical body connected to the upper cylindrical body . The lower surface is closed by a horizontal bottom plate, and a plurality of small circular openings are formed in the bottom plate at a constant opening angle around the common central axis of the cylindrical shape, and a small feeder is provided in each of the small circular openings. Each is connected, and a central cone centered on the common central axis is provided above the bottom plate, and the central cone is provided by a plurality of support arms radially provided between the inner peripheral surface of the storage tank. Each of the support arms is fixed to the inner peripheral surface of the inverted conical portion connected to the hopper portion at a position where the small circular opening is not blocked at the constant opening angle around the common central axis. each is fixed, between the inner circumferential surfaces of the upper edge and the upper cylindrical body of each support arm, a plate-shaped partition plate toward the common central axis from the inner peripheral surface of the storage tank, said in each provided Rukoto at the position of the fixed opening angle around the common central axis, each partition plate is fixedly connected to the inner peripheral surface of the respective upper edge and the upper cylindrical body of each of the support arms, these the inner peripheral surface of the storage tank by a partition plate is divided into a plurality of areas in the circumferential direction, the width of each of the lower edge of each partition plate, toward the rotation axis from the inner peripheral surface side of the storage tank The width is about half the length of the upper edge of the support arm or slightly narrower than half the length of the upper edge of the support arm, and the inner edge of each partition plate and the upper edge of each support arm. The angle between the two is a sharp angle smaller than 90 degrees, and each outer edge of each of the partition plates and the inner peripheral surface of the upper cylinder are connected without a gap, and each outer edge of the partition plate and the hopper portion are connected. A small gap for a partition plate is provided between the inner peripheral surface and each of the small gaps, and each of the small feeders is present in each of the areas surrounded by the partition plates. Will be done.

With this configuration, the powder or granular material material stored in the storage tank is discharged downward by the small feeder on the bottom plate because the entanglement in the circumferential direction is divided at a plurality of places by the plurality of partition plates. As a result, the powder or granular material in each area surrounded by the partition plate can smoothly descend, and the powder or granular material in the circumferential direction can be prevented from remaining on the inner peripheral surface in the storage tank. .. With this configuration, at the position of the support arm in the storage tank, the partition plate can provide a sufficient cut in the powder or granular material in the storage tank in the common rotation axis direction, and is surrounded by the partition plate. The powder or granular material can be lowered more smoothly in each area. With this configuration, the presence of the small gaps for the partition plate makes it possible to reduce the resistance when the powder or granular material material descends in the vicinity between the outer edge of each partition plate and the inner peripheral surface, and more smoothly. The powder or granular material can be lowered. By forming the lower half of the storage tank with a hopper in this way, the pressure on the bottom plate of the powder or granular material material in each area surrounded by the partition plate is reduced, and the powder or granular material material is lowered more smoothly. be able to. Further, by setting the above angle to an acute angle, it is possible to effectively reduce the bridging of the powder or granular material in the storage tank. With this configuration, there are corresponding small feeders (small circular openings) in the areas surrounded by the partition plates, and the small feeders at the corresponding positions for the powder or granular material in each area. In addition, it can be discharged smoothly.

Second, each support arm is formed in shape cross section triangular, each partition plate is fixedly connected to the respective upper edge to form the apexes, the fixed vertical plate in the radial outer edge of each support arm are each Each of the vertical plates is connected to the inner peripheral surface of the inverted conical portion to fix each of the support arms, and the inner peripheral surface of the inverted conical portion and each of the support arms are fixed. between each radial outer edge, the small clearance for the support arm is provided with each said first described is what is communicated to the above small gap and the small clearance for the support arms for each partition plates Consists of a multi-feeder.

With this configuration, the presence of the support arm gaps prevents the formation of bridges in the powder or granular material material in the vicinity of the radial outer edge of each support arm and the inner peripheral surface, and the powder or granular material material descends. Since the small gap for the partition plate and the small gap for the support arm are communicated with each other, the powder or granular material can be lowered more smoothly.

Thirdly, above the bottom a platen bottom of the central cone, the common central axis projecting from the rotary drive shaft around a plurality of spokes extending the bottom surface plate radially to the rotary drive shaft It is composed of the multi-feeder according to the first or second above, which is formed by connecting the central rotary scraping blades having the above.

With this configuration, when the discharge of the powder or granular material material in the storage tank is almost completed, the powder or granular material material or the like remaining on the bottom plate between the adjacent small circular openings is rotated by rotating the central rotary scraping blade. Can be discharged into the small circular opening, and the powder or granular material remaining in the vicinity of the bottom plate can be discharged almost completely.

Fourth , each of the spokes of the central rotary scraping blade is configured by the multi-feeder according to the third aspect , which is located below each of the support arms at the stop position.

With this configuration, the pressure of the powder or granular material does not act on the spokes, so the central rotary scraping blade can be driven by a drive motor with a lower output.

According to the present invention, the powder or granular material material stored in the storage tank is discharged downward by a small feeder on the bottom plate because the entanglement in the circumferential direction is divided at a plurality of places by a plurality of partition plates. Then, the powder or granular material in the area surrounded by the partition plate can smoothly descend, and the powder or granular material does not remain on the inner peripheral surface in the storage tank in the circumferential direction.

Further, by forming the lower half of the storage tank with a hopper, it is possible to more smoothly lower the powder or granular material in each area surrounded by the partition plate.

Further, by making the angle between the inner edge of the partition plate and the upper edge of the support arm an acute angle, it is possible to reduce the bridge of the powder or granular material material in the storage tank.

Further, at the position of the support arm in the storage tank, the partition plate can provide a sufficient cut in the powder or granular material in the storage tank in the common rotation axis direction, and each area surrounded by the partition plate can be provided. , The powder or granular material can be lowered more smoothly.

Further, due to the presence of the small gaps for the partition plate, the resistance when the powder or granular material material descends in the vicinity between the outer edge of each partition plate and the inner peripheral surface can be reduced, and the powder or granular material material can be made more smoothly. Can be lowered.

Further, due to the presence of the small gap for the support arm, the resistance when the powder or granular material material descends in the vicinity between the radial outer edge of each support arm and the inner peripheral surface can be reduced, and moreover, it is used for the partition plate. Since the small gap and the small gap for the support arm communicate with each other, the powder or granular material can be lowered more smoothly.

In addition, small feeders are present in the areas surrounded by the partition plates, and the powder or granular material in each area can be smoothly discharged by the corresponding small feeders.

In addition, when the discharge of the powder or granular material in the storage tank is almost completed, the central rotary scraping blade is rotated to open the small circular opening of the powder or granular material remaining on the bottom plate between the adjacent small circular openings. It can be discharged to the part, and the powder or granular material remaining in the vicinity of the bottom plate can be discharged almost completely.

Further, since the pressure of the powder or granular material does not act on the spokes, the central rotation scraping blade can be driven by a lower output drive motor.

It is a partial cross-sectional side view of the multi-feeder which concerns on this invention. Same as above. It is a plan view of the multi-feeder. It is sectional drawing of the above-mentioned multi-feeder. Same as above. It is a view showing the vicinity of the central cone of the multi-feeder, (a) is a plan view of the central cone, (b) is a side view of the central cone, and (c) is a connection state between the central cone and the support arm. It is a figure which shows. The same is a schematic perspective view of the inside of the storage tank of the multi-feeder. (A) is a schematic perspective view of a storage tank in which the powder or granular material is charged, and (b) is a schematic perspective view of the storage tank in a state where the powder or granular material is lowered to some extent. It is a perspective view of the conventional storage tank, and is the figure which shows the state which the descent of the powder or granular material material in a storage tank progressed to some extent.

Hereinafter, the multi-feeder according to the present invention will be described in detail.

FIG. 1 shows a side view of the multi-feeder, and FIG. 2 shows a plan view of the multi-feeder. More specifically, the upper side of the lower cylindrical body 4 of FIG. 1 is a cross-sectional view taken along the line XX of FIG. 2, and the lower side of the lower cylindrical body 4 of FIG. 1 is a side view seen from the arrow Y direction of FIG.

In these figures, reference numeral 1 denotes a cylindrical silo, which is connected to a cylindrical upper cylindrical body 2 having a common central axis C as a central axis and a lower portion of the upper cylindrical body 2 by a flange F1. It is composed of an inverted conical hopper 3 having a shaft C as a shared central axis, and a lower cylindrical body 4 connected to the lower part of the hopper 3 by a flange F2 and centered on the common central shaft C. The silo 1 itself is vertically fixed on the machine frame 40.

The diameter of the upper cylinder 2 is, for example, 8 m, and the diameter of the lower portion of the lower cylinder 4 is, for example, 6 m. The multi-feeder according to the present invention is thus applied to a silo having a large diameter of 4 m or more in the lower portion of the lower cylindrical body 4 (the diameter of the upper cylindrical body 2 is, for example, 6 m to 20 m).

The upper end portion 4a of the lower cylindrical body 4 is inclined in an inverted conical shape at the same inclination angle as the inverted conical shape of the side surface of the hopper portion 3, and the inverted conical portion having the common central axis C as the common center. 5 is formed so that the inner peripheral surface 3a of the hopper portion 3 smoothly continues to the inner peripheral surface 5a of the inverted conical portion 5 having the same inclination angle even inside the lower cylindrical body 4. Is formed in. The lower end portion 5b of the inverted head cone portion 5 is fixed at a position close to the bottom plate 6 of the lower cylindrical body 4 (distance t1 between the lower end portion 5b and the bottom plate 6).

Here, it is assumed that the "hopper" is composed of the hopper portion 3 and the inverted head conical portion 5. Further, it is assumed that the "storage tank" is composed of the upper cylinder 2, the hopper 3, and the lower cylinder 4. The "inner peripheral surface of the storage tank" refers to the inner peripheral surface 2a of the upper cylindrical body 2, the inner peripheral surface 3a of the hopper portion 3, the inner peripheral surface 4c of the lower cylindrical body 4, and the inverted head cone. It shall refer to the inner peripheral surface 5a of the portion 5.

A flange 4b is provided on the outer periphery of the lower opening of the lower cylinder 4, and a horizontal bottom plate (bottom plate of the storage tank) 6 for closing the lower opening of the lower cylinder 4 is connected to the flange 4b. Has been done.

As shown in FIG. 2, on the bottom plate 6, the centers Ca, Cb, and Cc are located on the flat upper surface 6a at an opening angle of 120 degrees in the circumferential direction with the common central axis C as the center. Two small circular openings 7a, 7b, 7c are formed through. The small circular openings 7a to 7c (a plurality of small circular openings are collectively indicated by the reference numeral "7") are not limited to the three in the present embodiment, and the diameters of the hopper portion 3 and the lower cylindrical body 4 are not limited to three. , 4, 5, 6, or the like may be used depending on the material to be supplied. These small circular openings 7 are formed through the bottom plate 6 with a uniform opening angle around the common central axis C. Rotating feeders (small feeders) 8a to 8c are connected to the back surface side of these small circular openings 7 via short cylinders 8a'to 8c', respectively.

These small circular openings 7a, 7b, 7c are formed at positions where the outer circumferences of the circles are close to the inner peripheral surface 4c of the lower cylindrical body 4 in a plan view (see FIG. 2), and each small circular opening 7a, 7b, 7c is formed. The centers (central axes) Ca, Cb, and Cc of the circular openings 7a, 7b, and 7c are located on the circumference at a distance t2 in the radial direction from the common central axis C, and all are circles having the same radius t3. It is composed of. Therefore, in the lower part (bottom plate 6) of the hopper portion 3 and the lower cylindrical body 4, only the small circular openings 7a, 7b, 7c are opened, and the other horizontal portions are closed by the flat upper surface 6a of the bottom plate 6. It is in a state of being.

Small hoppers 9a, 9b, 9c having an inverted conical shape are connected to the small circular openings 7a, 7b, 7c, respectively, and the rotations of the lower openings of the small hoppers 9a, 9b, 9c are connected to each of the small hoppers 9a, 9b, 9c. Feeders 8a to 8c are connected. These rotary feeders 8a to 8c allow the powder or granular material supplied from above to be discharged from the discharge port 11 (see FIG. 3) formed in the bottom plate 23 by the rotation of the rotary blade 10 on the bottom plate 23 (direction of arrow A'). , It discharges a fixed amount downward. Further, level sensors 24a to 24c are provided on the short cylinders 8a'to 8c'. This is because when the level Q of the powder or granular material material M in the storage tank drops below the short cylinders 8a'to 8c', this is detected by the level sensors 24a to 24c, and at this time, the control unit controls the center. The rotary scraping blade 14'is driven in the forward and reverse rotations to control the powder and granular material remaining on the bottom plate 6 to be discharged to the small circular openings 7a to 7c.

An electric motor M capable of forward and reverse rotation is fixed to the central portion of the bottom plate 6 on the back surface 6c side, and a speed reducer is used on the output shaft of the electric motor M to drive the rotation around the common central shaft C as the central axis. A shaft 12 is connected, and the rotation drive shaft 12 is formed so as to project toward the upper surface 6a of the bottom plate 6.

A central disk 13 centered on the common central axis C is connected to the rotary drive shaft 12 projecting from the upper surface 6a of the bottom disk 6, and three spokes 14 of the central rotary scraping blade 14'from the central disk 13 are connected. , 14 and 14 are formed to extend radially, and each central rotation scraping blade 14'can be rotated forward and reverse in the direction of arrow A or the direction of arrow A'by driving the rotation drive shaft 12. Further, the back surfaces of the spokes 14, 14, and 14 are located close to the bottom plate 6 without being in contact with the bottom plate 6.

Further, a protruding portion 13a detected by the proximity sensor 22 provided on the bottom plate 6 is provided on the back surface side of the central disk 13 of the central rotation scraping blade 14', and the protruding portion 13a is provided directly above the proximity sensor 22. Spokes 14, 14, 14 of the spokes 14, 14, 14 so that each spoke 14, 14, 14 can stop at a position (position of FIG. 2) that does not block the small circular openings 7a, 7b, 7c when Controls the stop position.

As shown in FIG. 2, the stop positions of the spokes 14 are such that the spokes 14 are located just below the three support arms 15 described later, and at the stop positions, the spokes are stopped. It is configured so that the material load is not directly applied to 14, 14 and 14. By inserting and fitting the rotary drive shaft 12 into the recess provided in the center of the back surface of the central disk 13, the spokes 14, 14 and 14 can be rotated in the direction of arrow A or arrow A'.

On the upper side of the central disk 13, the central cone 16 is fixed by three support arms (triangular beams for decompression) 15, 15, 15 in a state where the apex of the central cone 16 is aligned with the common central axis C. .. The central disk 13 exists within the range of the lower surface of the central cone 16 and is configured so that the load of the powder or granular material material filled in the hopper portion 3 is not directly applied. Further, a gap t5 is formed between the upper surface of the central disk 13 and the central portion of the three support arms 15.

As shown in FIG. 2, the support arms 15 are provided in three directions at an angle of 120 degrees with respect to the common central axis C. Each of these support arms 15 is an isosceles triangular plate having a radial top R at the upper end 15c extending horizontally in the radial direction, and is inside each of the support arms 15 (inside the triangle shape). Along the top R, the vertical plate 17 is fixed vertically to the center position by the rib 17a in the width direction (see FIG. 1), and the vertical short plate 18 is bolted to the radial tip 17b of each vertical plate 17. Then, the radial outer edge of each vertical short plate 18 is welded and fixed to the inner peripheral surface (inner peripheral surface of the storage tank) 5a of the inverted head cone portion 5, whereby the central cone 16 is fixed at its apex. It is fixed so as to coincide with the common central axis C. The central cone 16 and the support arm 15 prevent the pressure of the powder or granular material material from directly acting on the bottom plate 6 to facilitate discharge in each of the rotary feeders 8a to 8c, and the central rotary scraping blade. It prevents the pressure of the powder or granular material from directly acting on 14'and allows it to rotate smoothly.

With the above configuration, there is a gap (small gap for the support arm) t4 (small gap for the support arm) between the radial outer edge 15a of each support arm 15 and the inner peripheral surface (inner peripheral surface of the storage tank) 5a of the inverted head conical portion 5. For example, a gap of 150 mm) is formed. This is because when the support arm 15 having a triangular cross section is fixed to the inner peripheral surface 5a of the inverted conical portion 5 as it is, gentle ridges are formed on the left and right inclined surfaces 15'and the inner peripheral surface 5a of the support arm 15. It is formed, and bridging of the powder or granular material is likely to occur starting from this ridgeline. Therefore, the support arm 15 and the inner peripheral surface 5a are configured to be connected by the vertical short plate 18, and in the vicinity of the inner peripheral surface 5a, the powder or granular material material laminated on the upper side of the support arm 15 is formed. The structure is such that the powder or granular material can fall downward from the interval t4, that is, the resistance when the powder or granular material material descends is reduced to prevent the formation of the bridge as described above. Here, the vertical plate 17 and the vertical short plate 18 are referred to as "vertical plates".

Further, when the radial outer edge 15a of the support arm 15 is connected to the inner peripheral surface 5a without a gap, the connecting portion between the radial outer edge 15a and the inner peripheral surface 5a becomes a resistance when the powder or granular material material is lowered. This is to eliminate the above resistance and allow the powder or granular material to descend smoothly.

The central cone 16 is fixed to the upper side of the central joint portion 15b of the three support arms 15 in a state where the apex of the central cone 16 is aligned with the common central axis C. Specifically, as shown in FIG. 4, in the central joint portion 15b of each of the support arms 15, upward fixing plates 19 are provided at three top portions R at the same distance from the common central axis C. , The downward fixing plate 20 (3 places) corresponding to the fixing plate 19 is projected inside (3 places) of the lower edge of the central cone 16 corresponding to the fixing plate 19 and described above. The central cone 16 is placed on the central joint portion 15b of each of the support arms 15 with its apex aligned with the common central axis C, and then the fixing plates 20 corresponding to the three fixing plates 20 are placed. By fixing 19 and 19 with bolts B, the central cone 16 is fixed so as to be placed on each of the top portions R at the center of the support arm 15.

With this configuration, a space S is formed between the lower surface side of the central cone 16 and the slopes 15'on both sides of the top R of the support arm 15 (see FIG. 4C), so that the hopper 3 When the level of the powder or granular material material filled therein gradually decreases and the level Q decreases downward from the central cone 16 through the support arm 15, the central cone 16 Since there are no joints between the lower surface and the support arm 15 other than the three fixing plates 19 and 20, and the space S is formed, the lower edge 16'of the central cone 16 is formed. The powder or granular material material descending from the lower edge 16'will immediately descend along both inclined surfaces 15'of the support arm 15, and the connecting portion between the central cone 16 and each of the support arms 15 In addition, the gentle ridge line that is the starting point of the bridge is not generated, and the generation of the bridge due to the powder or granular material can be prevented.

Further, as shown in FIGS. 1 and 2, the upper edges 15c, 15c, 15c of the three support arms 15, 15, 15 and the upper cylinders corresponding to the upper edges 15c, 15c, 15c are respectively. Three plate-shaped partition plates 21, 21, 21 (for example) between the inner peripheral surface 2a (three places) of the body (storage tank) 2 and the inner peripheral surface 2a toward the common central axis C, respectively. (Made of steel plate) are provided in the vertical direction, and the inner peripheral surfaces 2a and 3a of the storage tank 2 and the hopper portion 3 (storage tank) are provided at a plurality of locations (in the present embodiment) in the circumferential direction by the partition plates 21, 21, 21. In this case, as shown in FIGS. 2 and 6 (b), the area is divided into three areas (K1, K2, and K3). That is, between the upper edges 15c, 15c, 15c of the support arms 15, 15, 15 and the inner peripheral surface 2a of the storage tank (upper cylindrical body 2), the common center from the inner peripheral surface 2a. Plate-shaped partition plates 21, 21, 21 and 21 facing the shaft C are provided, respectively, and the inner peripheral surfaces 2a, 3a of the storage tank are provided in a plurality of circumferential directions by the partition plates 21, 21, 21, 21 (in the case of the present embodiment). Is divided into three).

Specifically, as shown in FIG. 2, these three partition plates 21, 21, 21 have an angle difference of 120 degrees from each other toward the common central axis C, and the inner peripheral surfaces 2a, It is provided so as to divide 3a into three parts.

Since the configurations of the three partition plates 21, 21, 21 are the same, the partition plate 21 of FIG. 1 will be described. The width t6 of the lower edge of the partition plate 21 is the width t6 from the inner peripheral surface 3a of the hopper portion 3 to the above. The width is about half the length t7 of the upper edge 15c of the support arm 15 or slightly narrower than half the length of the upper edge 15c of the support arm 15 toward the common central axis C.

Then, the partition plate 21 has the upper cylindrical body having the width t6 and the inner edge 21a on the common central axis C side from the lower end at the same inclination angle θ as the inner peripheral surface 3a of the hopper portion 3. It is extended to the inner peripheral surface 2a of 2. As a result, the angle θ formed by the inner edge 21a of the partition plate 21 on the rotation center axis C side and the upper edge 15c of the support arm 15 is 70 degrees. The angle θ is preferably any angle within the range of 55 degrees to 80 degrees, more preferably 60 degrees to 70 degrees (acute angle smaller than 90 degrees).

Further, the outer edge 21b of each of the partition plates 21 on the inner peripheral surface 2a side of the upper cylindrical body 2 is connected to the inner peripheral surface 2a of the upper cylindrical body (storage tank) 2 without a gap, and the partition plates 21 of the above. A gap (small gap for partition plate) t8 (for example, 50 mm) is provided between the outer edge 21c on the inner peripheral surface 3a side of the hopper portion (storage tank) 3 and the inner peripheral surface 3a of the hopper portion 3. There is. The gap t8 is continuous with a constant width (t8) from the inner peripheral surface 3a of the upper end portion of the hopper portion 3 to the lower end of the inner peripheral surface 3a of the hopper 3, and the lower end of the gap t8 is the gap (the gap (t8). (Small gap for support arm) It communicates with t4. That is, a small gap t8 for the partition plate is provided between the outer edge 21c on the inner peripheral surface side of each of the partition plates 21 and the inner peripheral surface 3a.

The gap t8 is provided when the outer edge 21c of the partition plate 21 and the inner peripheral surface 3a of the hopper portion (storage tank) 3 are connected without a gap, and the partition plate 21 and the inner peripheral surface 3a are joined. This is because the portion becomes a resistance when the powder or granular material is lowered, so that the above resistance is eliminated and the powder or granular material is smoothly lowered.

Further, since the lower end of the gap t8 communicates with the gap (small gap for the support arm) t4, the powder or granular material in the vicinity of the partition plate 21 is an inverted head cone from the inner peripheral surface 3a of the hopper portion 3. Even if it shifts to the inner peripheral surface 5a of the portion 5, the powder or granular material can be smoothly lowered without increasing the resistance when the powder or granular material is lowered.

As shown in FIG. 2, the three support arms 15, 15, and 15 have a constant opening angle (120 degrees in the case of the present embodiment) about the common central axis C, and have the small circular opening. The portions 7a, 7b, and 7c are fixed at positions where they are not blocked, and the partition plates 21, 21, 21, and 21 are provided on the support arms 15, 15, and 15, respectively. That is, each partition plate 21, 21, 21 is also provided at a position of a constant opening angle (120 degrees in the case of the present embodiment) about the common central axis C.

Since the present invention is configured as described above, the operation of the multi-feeder of the present invention will be described next.

In the case of the present embodiment, the powder or granular material is a wood chip (strip-shaped raw material) having a size of about 25 mm × 35 mm and a thickness of about 7 mm to 8 mm. It is assumed that the diameter of the storage tank is 8 m, the diameter of the lower cylindrical body 4 is 6 m, the bottom plate 6 has three small circular openings 7, and three rotary feeders 8 are provided.

First, wood chips (upper end level Q of the powder or granular material M (see FIG. 3)) are put into the storage tank through the upper opening of the upper cylindrical body 2 by a vertical conveyor or the like. In the storage tank, the powder or granular material material M is stored from the bottom plate 6 to the level Q of the upper edge of the upper cylindrical body 2 (state in FIG. 6A), and the powder or granular material material M is further stored in the bottom plate. It is put into the small hoppers 9a to 9c from 6 through the small circular openings 7a to 7c, and is put into the bottom 23 of each of the rotary feeders 8a to 8c (see FIGS. 3 and 6). ..

In this state, the three rotary feeders 8a to 8c are continuously rotated. Specifically, the rotary blades 10 of the rotary feeders 8a to 8c are rotationally driven in the direction of the arrow A'by each drive motor M'. Then, the powder or granular material material existing on the bottom plate 23 is transferred in the peripheral direction of each bottom plate 23 while rotating by the rotation of each rotary blade 10 in each of the rotary feeders 8a to 8c, and each provided on each bottom plate 23. A fixed amount is discharged downward from the discharge port 11 (FIG. 3, arrow E direction). A discharge chute 11a is provided below the discharge port 11, and a conveyor (not shown) is arranged at the lower end of the discharge chute 11a, and is transported to a target location by the delivery conveyor. Conveyor belt.

As described above, when the powder or granular material in the silo 1 is discharged downward by the rotary feeders 7a to 7b below the bottom plate 6 of the silo (storage tank) 1, the small circular openings 7a to 7a to The powder or granular material deposited on the upper part of 7b is gradually discharged downward. At this time, since the lower half of the storage tank is formed by the hoppers (hopper portion 3 and inverted head cone portion 5), the hoppers in the areas K1 to K3 surrounded by the partition plates 21, 21, 21. While the pressure on the bottom plate 6 of the powder or granular material material is reduced, the powder or granular material can be lowered more smoothly.

Here, the upper cylindrical body 2 as the storage tank and the inner peripheral surfaces 2a and 3a of the hopper portion 3 have partition plates 21, 21, 21 and 21 facing the common central axis C at three locations, and thus these partitions. Due to the presence of the plates 21, 21, 21, the entanglement of the powder and granular material M in the circumferential direction is divided at the positions where the partition plates 21, 21, 21 are present. That is, in FIG. 2, the powder or granular material material located in the vicinity of the inner peripheral surfaces 2a, 3a of the upper cylindrical body 2 is in a state of being pre-cut by three partition plates 21, 21, 21. As a result, the powder or granular material is in a state of being divided into three areas of area K1, area K2, and area K3 every 120 degrees.

Therefore, when the quantitative discharge by each of the rotary feeders 7a to 7c proceeds and the powder or granular material material having a volume on the small circular opening 7a to 7c is discharged downward, the powder or granular material material located in the area K1 is discharged. M is a powder or granular material located in the vicinity of the inner peripheral surfaces 2a and 3a of the storage tank of the area K1 by discharging the powder or granular material material M which is volumetrically above the small circular opening 7a corresponding to the area K1. The body material M also descends in the direction of arrow G (see FIG. 6B). This is because the powder or granular material M located near the inner surfaces 2a and 3a of the storage tank in the area K1 is entangled in the circumferential direction by the partition plates 21 and 21 on both sides, and the entanglement force in the circumferential direction is divided. As the powder or granular material material M deposited on the upper part of the small circular opening 7a descends, the inner circumference of the upper part (upper cylindrical body 2) of the storage tank in the area K1 is induced by the descending. This is because the powder or granular material material located in the vicinity of the surfaces 2a and 3a also descends as a whole.

The same applies to the powder or granular material materials existing in areas K2 and K3. That is, when the quantitative discharge by each of the rotary feeders 7a to 7c proceeds and the powder or granular material having a volume on the small circular openings 7b and 7c is discharged downward, the powder located in the area K2 (K3) is discharged. The granular material M is contained in the storage tank of the area K2 (K3) by discharging the powder / granular material M which is volumetrically formed on the small circular opening 7b (7c) corresponding to the area K2 (K3). The powder or granular material material M located near the peripheral surfaces 2a and 3a also descends in the direction of arrow G (see FIG. 6B).

Similarly, the powder or granular material material M located near the inner peripheral surfaces 2a and 3a of the storage tank in the area K2 (K3) is entangled in the circumferential direction by the partition plates 21 and 21 on both sides. Since the force of mutual entanglement in the circumferential direction is weak, when the powder or granular material material M that has a volume above the small circular opening 7b (7c) descends, it is induced by the descending and the area K2 (K3). This is because the whole of the powder or granular material material M located in the vicinity of the inner peripheral surfaces 2a and 3a of the upper cylindrical body 2 of the above is similarly lowered.

Further, since an interval t8 (small gap for the partition plate) is formed between each of the partition plates 21, 21, 21 and the inner peripheral surface 3a of the hopper portion (storage tank) 3, the powder or granular material material M can be used. When the inner peripheral surface 3a of the hopper portion 3 is lowered, the inner edge 21c of the partition plate 21 and the powder or granular material material M located in the vicinity of the inner peripheral surface 3a are lowered, and a situation of resistance does not occur. In each of the areas K1, K2, and K3, the powder or granular material material M located near the inner edges 21c and 21c of the partition plates 21 on both sides can also be smoothly lowered.

Further, since a distance t4 is also formed between each radial outer edge 15a and the inner peripheral surface 5a of each support arm 15, the inclined surfaces 15'and 15'of the support arm 15 (see FIG. 4C). No bridge is formed between the powder or granular material material existing in the above-mentioned storage tank and the inner peripheral surface 5a of the storage tank, and the powder or granular material material M on the inclined surfaces 15'and 15'is smoothly lowered. I will go. At this time, since the interval t8 and the interval t4 are in communication with each other, the powder or granular material material in the vicinity of the outer edge 21c of the partition plate 21 and the inner peripheral surface 3a of the storage tank smoothly descends, and subsequently, the above. The inclined surfaces 15'and 15'near the radial outer edge 15a of the support arm 15 can be smoothly descended, and the outer edge 21c of the partition plate 21, the inner peripheral surface 3a, and the radial outer edge of the support arm 15 can be smoothly descended. The 15a and the inner peripheral surface 5a do not serve as resistance when the powder or granular material is lowered.

Then, the level Q of the powder or granular material material in the storage tank is lowered in the hopper portion 3, and further lowered in the short cylinders 8a'to 8c'in each of the small circular openings 7a to 7c, and the level is further lowered. When Q shifts below the positions of all the detection sensors 24a, 24b, 24c and the discharge of the powder or granular material reaches the final stage, when this is detected by the level sensors 24a, 24b, 24c, the control unit ( (Not shown) drives the drive motor M in forward and reverse rotation. As a result, the central rotation scraping blade 14'rotates forward and reverse for a certain period of time (for example, 10 to 20 seconds) in the direction of arrow A and the direction of arrow A', and the upper surface 6a of the bottom plate 6 around the small circular openings 7a to 7c. The powder or granular material material M remaining in the above-mentioned small circular openings 7a to 7c is discharged.

The rotation range of the spoke 14 is, for example, in the arrow A direction until the front end of the spoke 14 in the arrow A direction is located at the edge of the adjacent small circular opening 7a to 7c (small circular opening in FIG. 2). At position a) of 7a, the direction of arrow A'is until the front end of the spoke 14 in the direction of arrow A'is located at the edge of the adjacent small circular opening 7a to 7c (of the small circular opening 7c in FIG. 2). Position b), and this range (range of a and b) is driven in the forward and reverse directions for a certain period of time.

Therefore, the powder or granular material M located on the upper surface 6a of the bottom plate 6 around the small circular openings 7a to 7c can be almost completely discharged into the small circular openings 7a to 7c.

Further, even if new powder material is sequentially introduced from the upper part (upper part of the upper cylindrical body 2) in the storage tank while the quantitative discharge operation as described above is being continued, the powder particles are similarly charged as described above. Since the body material sequentially descends smoothly in the direction of arrow G in each of the areas K1 to K3, it means that the powder or granular material that is not discharged remains in a ring shape on the inner peripheral surfaces 2a, 3a, 5a of the storage tank. Rather, the charged powder or granular material material M is sequentially and quantitatively discharged in the order in which it is charged.

As described above, in the present invention, the powder or granular material material stored in the storage tank is divided into entanglements in the circumferential direction at a plurality of places by the plurality of partition plates 21, 21, 21. Therefore, the bottom plate 6 is supplied in a small size. When the powder or granular material is discharged downward by the machines 8a to 8c, the powder or granular material in the areas K1 to K3 surrounded by the partition plate 21 can be smoothly lowered, and the powder or granular material can be smoothly lowered to the inner peripheral surface in the storage tank in the circumferential direction. No powder or granular material remains in the material.

Further, by forming the lower half of the storage tank with a hopper, it is possible to more smoothly lower the powder or granular material in each of the areas K1 to K3 surrounded by the partition plate 21.

Further, by setting the angle θ between the support arm 15 and the partition plate 21 to be an acute angle, it is possible to effectively reduce the bridge of the powder or granular material in the storage tank.

Further, at the position of the support arm 15 in the storage tank, the partition plate 21 can provide a sufficient cut in the powder or granular material in the storage tank in the common central axis C direction, and is surrounded by the partition plate 21. The powder or granular material can be lowered more smoothly in each of the areas K1 to K3.

Further, due to the presence of the small gap t8 for the partition plate, the resistance when the powder or granular material material descends in the vicinity between the outer edge 21c of each partition plate 21 and the inner peripheral surface can be reduced, and the powder can be powdered more smoothly. The granular material can be lowered.

Further, due to the presence of the small gap t4 for the support arm, the resistance when the powder or granular material material descends in the vicinity between the radial outer edge 15a of each support arm 15 and the inner peripheral surface can be reduced, and moreover, the resistance when the powder or granular material material descends can be reduced. Since the partition plate small gap t8 and the support arm small gap t4 communicate with each other, the powder or granular material can be lowered more smoothly.

Further, the small feeders 7a to 7c are present in the areas K1 to K3 surrounded by the partition plate 21, respectively, and the powder or granular material of each area is smoothly discharged by the corresponding small feeder. be able to.

Further, at the stage where the discharge of the powder or granular material material in the storage tank is substantially completed, the powder or granular material remaining on the bottom plate 6 between the adjacent small circular openings 7a to 7c by rotating the central rotary scraping blade 14'. The material or the like can be discharged into the small circular openings 7a to 7c, and the powder or granular material remaining in the vicinity of the bottom plate 6 can be discharged almost completely.

Further, since the pressure of the powder or granular material does not act on the spokes 14, the central rotation scraping blade 14'can be driven by the lower output drive motor M.

In the above embodiment, the case where the number of small circular openings is three has been described, but the number of small circular openings may be four or five at an even opening angle around the common central axis C, and the number thereof is limited. Not done. Of course, when there are 4 or 5 small circular openings, 4 or 5 rotary feeders are provided correspondingly, and the support arm of the central cone also has 4 or 5 small circular openings. In this case, four or five are provided at positions where each small circular opening is not blocked. Further, four or five spokes of the central rotation scraping blade will be provided downward on the support arm. In this case, four or five partition plates 21 are provided on the support arm corresponding to the support arm.

Further, in the above embodiment, the storage tank is described as being composed of the upper cylindrical body 2, the hopper portion 3, and the lower cylindrical body 4, but the storage tank is not limited to this, and a storage tank having a cylindrical shape as a whole may be used.

According to the present invention, the entanglement of the powder or granular material such as wood chips in the storage layer in the circumferential direction can be divided. For example, even if the powder or granular material is continuously charged into the storage tank, it is substantially charged. It is expected that it will be widely used because it can be discharged in a fixed quantity in the order in which it was used.

2 Upper cylinder 2a Inner peripheral surface 3 Hopper part 3a Inner peripheral surface 5 Inverted conical part 5a Inner peripheral surface 6 Bottom plate 7a to 7c Small circular opening 8a to 8c Rotating feeder (small feeder)
14 Spokes 14'Central rotation scraping blade 15 Support arm 15a Radial outer edge 15c Upper edge 16 Central cone 18 Vertical short plate 21 Partition plate 21a Inner edge 21c Outer edge t4 Small gap for support arm t6 Width t8 Small gap for partition plate θ Angle R Top

Claims (4)

A cylindrical water tank is provided to store the powder or granular material.
The storage tank is composed of an upper cylinder, a hopper connected to the upper cylinder, and a lower cylinder connected to the hopper.
The lower surface of the storage tank is closed by a horizontal bottom plate, and a plurality of small circular openings are formed in the bottom plate at a constant opening angle around the common central axis of the cylindrical shape.
A small feeder is connected to each of the above small circular openings,
A central cone centered on the common central axis is provided above the bottom plate, and the central cone is fixed by a plurality of support arms radially provided between the central cone and the inner peripheral surface of the storage tank.
Each of the support arms is fixed to the inner peripheral surface of the inverted conical portion connected to the hopper portion at a position where the small circular opening is not blocked at the constant opening angle around the common central axis. And
Between each upper edge of each of the support arms and the inner peripheral surface of the upper cylinder, a plate-shaped partition plate extending from the inner peripheral surface of the storage tank toward the common central axis is centered on the common central axis. in each provided Rukoto at a position above a certain opening angle of, each partition plate is fixedly connected to the inner peripheral surface of the respective upper edge and the upper cylinder of the respective support arms, said reservoir by these partition plates is divided into a plurality of areas the inner circumferential surface of the bath in the circumferential direction,
The width of each lower edge of each of the partition plates is about half the length of the upper edge of the support arm or the upper edge of the support arm from the inner peripheral surface side of the storage tank toward the rotation center axis. Consists of a width slightly narrower than half the length of
The angle formed by the inner edge of each of the partition plates and the upper edge of each of the support arms is an acute angle smaller than 90 degrees.
In addition, each outer edge of each of the partition plates and the inner peripheral surface of the upper cylinder are connected without a gap, and each outer edge of the partition plate and the inner peripheral surface of the hopper portion are used for the partition plate. A small gap is provided,
A multi-feeder in which each of the small feeders exists in each of the areas surrounded by the partition plates. Each of the support arms is formed in a triangular cross section, and each of the partition plates is connected and fixed to each upper edge forming each top.
A vertical plate is fixed to the outer edge in the radial direction of each of the support arms, and each of the support arms is fixed by connecting each of the vertical plates to the inner peripheral surface of the inverted head cone.
A small gap for the support arm is provided between the inner peripheral surface of the inverted head cone and the outer edge of each support arm in the radial direction.
The multi-feeder according to claim 1, wherein the small gaps for each partition plate and the small gaps for each support arm are communicated with each other. A rotation drive shaft centered on the common central axis is projected on the bottom plate and below the central cone, and the rotation drive shaft has a plurality of spokes extending radially on the bottom plate. The multi-feeder according to claim 1 or 2, wherein the scraping blades are connected. The multi-feeder according to claim 3 , wherein each spoke of the central rotary scraping blade is located below each support arm at its stop position.

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