JP7458120B1 - Powder Supply Device - Google Patents

Abstract

The present invention provides a powder supply device capable of stably supplying powder.
[Solution] The powder feeder rotates around a rotating shaft 33 along a direction substantially perpendicular to the vertical direction, has an outer circumferential surface 13a on which powder 70 is guided, and drops the powder 70 on the outer circumferential surface 13a. The rotating rotor 13 supplies powder to the disperser by rotating the rotor 13, and the rotating rotor 13 has elasticity that contacts the outer circumferential surface 13a so that the rotor 13 can rotate, and seals the inside of the powder feeder from the moisture of the dissolved water 80 in the disperser. and an air supply port 35 for supplying air 90 for drying the non-sealed space 11b outside the space sealed by the sealing member 28.
[Selection diagram] Figure 3

Description

The present invention relates to a powder supply device that supplies powder to a supply target.

A supply device that steadily supplies powdered polymer flocculant is known. This supply device prevents moisture-absorbed flocculant from adhering to the lower rotor and its surrounding components.

JP 2003-326106 A

The powder is quantitatively supplied to the dissolution tank together with dissolution water. At this time, the powder supply device is close to the dissolution tank, and unless it is isolated from the dissolution tank, the humidity in the dissolution tank will rise, and the atmosphere inside the powder supply device will be affected by the humidity. In addition, the performance of powders has changed, and the number of highly hygroscopic powders is increasing, and supply devices are required to take further measures against humidity.

The present invention was made in consideration of these circumstances, and aims to provide a powder supplying device that can stably supply powder.

In order to solve the above-mentioned problems, a powder supply device according to the present invention includes a hopper that stores powder, and a powder feeder that drops the powder supplied from the hopper in a vertical direction to supply a fixed amount. , a disperser for supplying the powder supplied from the powder feeder to a dissolution tank together with dissolution water for dissolving the powder, the powder feeder being arranged in a direction substantially perpendicular to the vertical direction. The device rotates around a rotation axis along which the powder is supplied from the hopper, and has an outer circumferential surface on which the powder supplied from the hopper is guided, and supplies the powder to the disperser by dropping the powder on the outer circumferential surface. a rotating rotor, a sealing member having elasticity that contacts the outer peripheral surface so that the rotating rotor can rotate, and sealing the inside of the powder feeder from moisture of the dissolved water in the disperser; and a sealing member that is sealed by the sealing member. and a guide plate that guides the air toward the surface of the sealing member on the side of the non-sealing space .

The powder supply device of the present invention allows for a stable supply of powder.

FIG. 1 is an overall configuration diagram showing a polymer flocculant supply device from the front. FIG. 2 is a side view showing the overall configuration of the supply device of FIG. 1 . FIG. 3 is a sectional view of main parts of the supply device.

Embodiments of a powder supply device according to the present invention will be described based on the accompanying drawings.

The powder supplying device of the present invention supplies powder to a supply target located vertically below (below). The powder supplying device of the present invention is, for example, a polymer flocculant supplying device used in the dewatering process of sewage sludge, for quantitatively and continuously supplying a polymer flocculant to a dissolution tank. In this embodiment, an example will be described in which the powder supplying device of the present invention is the polymer flocculant supplying device described above.

FIG. 1 is a front view of the overall configuration of a supply device 1 for a polymer flocculant 70. As shown in FIG.
FIG. 2 is a side view of the overall configuration of the supply device 1 of FIG.
FIG. 3 is a cross-sectional view of a main part of the supply device 1. As shown in FIG.

The supply device 1 is fixedly disposed vertically above (above) the dissolution tank 60 and supplies a polymer flocculant 70 (hereinafter referred to as “flocculant 70”) to the dissolution tank 60. The supply device 1 includes a hopper 2, a powder feeder 3, and a disperser 4.

The hopper 2 is located at the top of the supply device 1 in the vertical direction. The hopper 2 contains a flocculant 70 (powder). At the top end of the hopper 2, there is a lid 7 with a handle 6 that can be opened and closed via a hinge 5. The lid 7 is locked in the closed position by a fixing bracket 8. The hopper 2 has a paddle-type powder level gauge 9 and a powder level window 10.

The powder feeder 3 is connected to the hopper 2 at its upper end and is disposed below the hopper 2. The powder feeder 3 drops the flocculant 70 supplied from the hopper 2 downward (vertically) and supplies it in a fixed amount. The powder feeder 3 includes a casing 11, a motor 15, a pair of powder guide plates 25a and 25b, an upper rotor 12, and a lower rotor 13.

The casing 11 mainly accommodates a pair of powder guide plates 25a, 25b, an upper rotor 12, and a lower rotor 13. The casing 11 is placed on the upper surface of the pedestal 17 at its lower end. Further, the casing 11 is joined at the upper end to the lower end of the hopper 2 by the flanges 18, 18 of each other. The casing 11 has an inspection window 21 on one side facing the outer peripheral surface 12a of the upper rotor 12.

The motor 15 and the reducer 16 are arranged adjacent to one side of the casing 11 . The motor 15 and the reduction gear 16 are housed in the motor cover 14. The speed reducer 16 has an output shaft to which a sprocket 19 is attached, and these are covered with a cover 20.

The upper rotor 12 rotates around a rotation axis 30 extending in a direction orthogonal to the vertical direction, and causes the flocculant 70 guided on the outer circumferential surface 12a to fall by gravity as it rotates.

The upper rotor 12 has a width that is approximately the same as the width direction (perpendicular to the paper surface of FIG. 3) of the powder guide plates 25a and 25b. The rotating shaft 30 is supported in a sealed manner by a bearing attached to the outside of the casing 11.

As shown in FIG. 3, the pair of powder guide plates 25a, 25b guide the coagulant 70 supplied from the hopper 2 to the upper rotor 12. The upper ends of the powder guide plates 25a, 25b are fixed to the upper end side of the casing 11. The powder guide plates 25a, 25b are arranged in an inverted V shape with the lower ends tilted so that the entrance is wide and the exit is narrow.

One powder guide plate 25a is attached to the casing 11 at an inclined angle of 50 degrees with respect to the upper end surface of the casing 11, for example. The powder guide plate 25a has an upper seal member 26 at its lower end. The upper seal member 26 contacts the outer peripheral surface 12a of the upper rotor 12. The upper seal member 26 prevents the flocculant 70 from leaking from the gap between the lower end of the powder guide plate 25a and the outer peripheral surface 12a. Further, the upper sealing member 26 scrapes off the flocculant 70, which has been conveyed to the upper sealing member 26 while remaining on the outer peripheral surface 12a without falling from the outer peripheral surface 12a, from the outer peripheral surface 12a and falls.

The other powder guide plate 25b is attached to the casing 11 at an inclined angle of 45 degrees with respect to the upper end surface of the casing 11, for example. The powder guide plate 25b forms a predetermined gap between the lower end and the outer peripheral surface 12a. The powder guide plate 25b has its lower end located on the rear side in the rotational direction of the upper rotor 12 with respect to the vertical line passing through the center of the upper rotor 12, so that the flocculant 70 naturally falls without passing over the outer peripheral surface 12a. can be prevented.

The lower rotor 13 (rotating rotor) is arranged below the upper rotor 12. The lower rotor 13 prevents the flocculant 70 from being sprayed onto the disperser 4 in a solidified "clump" state. The lower rotor 13 has a rotation axis 33 that extends along the rotation axis 30 of the upper rotor 12 . The rotating shaft 33 is supported in a sealed manner by a bearing attached to the outside of the casing 11. The lower rotor 13 has a substantially triangular shape when viewed along the rotation axis 33, and its corners are curved or acute-angled. The lower rotor 13 has an outer peripheral surface 13a along which the flocculant 70 is guided, and causes the flocculant 70 on the outer peripheral surface 13a to fall downward as it rotates.

Sprockets 22 and 23 are attached to each rotating shaft 30 and 33 of the upper rotor 12 and lower rotor 13, respectively. Furthermore, an endless chain 24 is attached to the sprockets 19, 22, and 23. The endless chain 24 rotates as the reducer 16 and sprocket 19 rotate due to the drive of the motor 15. In response to this, the sprockets 22 and 23 rotate, thereby causing the upper rotor 12 and the lower rotor 13 to rotate.

The powder feeder 3 further includes a pair of lower seal members 28, a pair of side seal members 29, an air inlet 35, and a guide plate 37.

The lower seal member 28 (seal member) is arranged to prevent moisture from entering the powder feeder 3 from the dissolution tank 60 and the disperser 4 below. The upper end of the lower seal member 28 is fixed to the casing 11 near the lower end of the upper rotor 12. Further, the lower seal member 28 is arranged in an inverted V-shape with its lower end inclined so that the inlet is wide and the outlet is narrow.

The lower seal member 28 is made of, for example, rectangular NBR (nitrile rubber). The lower seal member 28 is biased toward the outer circumferential surface 13a of the lower rotor 13 by an elastic plate spring 28a provided on its back surface (outside) so that the lower rotor 13 can rotate. As a result, the lower seal member 28 contacts the outer circumferential surface 13a while following the rotation of the lower rotor 13 and changing the distance between the tips thereof due to the action of the leaf spring 28a. That is, the lower seal member 28 follows the shape of the rotating outer circumferential surface 13a and is always in contact with and sealing the outer circumferential surface 13a. Thereby, the lower seal member 28 divides the inside of the casing 11 into a seal space 11a and a non-seal space 11b.

The flocculant 70 that has fallen from the upper rotor 12 is discharged from a small gap between the lower rotor 13 and the outer circumferential surface 13a of the lower seal member 28, and is spread in a widthwise direction on the inclined portion 46b of the water film rectifying plate 46. be done. At this time, the aggregated flocculant 70 is not discharged from the small gap, but only the powdered flocculant 70 is discharged. In addition, since the lower seal member 28 is applied with a force toward the lower rotor 13 by the leaf spring 28a, the flocculant 70 is uniformly dispersed on the outer circumferential surface 13a and is sprayed onto the inclined portion 46b.

The side seal member 29 is arranged to prevent the flocculant 70 discharged by the upper rotor 12 from taking a short pass and being directly sprayed onto the disperser 4 . The side seal member 29 is made of a substantially trapezoidal NBR whose lower side has an arcuate shape with a slight gap from the outer circumferential surface 13a of the lower rotor 13. The side seal member 29 is fixed to the casing 11 with, for example, bolts and nuts.

The air supply port 35 supplies air 90 (dry air 90, for example, air with a dew point of 10 degrees) for drying the non-sealed space 11b outside the space sealed by the lower seal member 28 (and side seal member 29). do. The air supply port 35 is located at a position substantially corresponding to the position of the lower rotor 13 in the vertical direction of the casing 11, and is disposed facing the outer surface 28b of the lower seal member 28 facing the non-sealed space 11b.

The air supply port 35 is provided with a nozzle 36 . The nozzle 36 supplies dry air 90 into the casing 11 from the air supply port 35 by being connected to a separately prepared dry air 90 supply source.

Guide plate 37 guides dry air 90 toward outer surface 28b. The guide plate 37 has a fixed part 37a and an air guide part 37b. The fixed part 37a is a part fixed to the lower end of the casing 11. The air guide portion 37b is a portion that is bent upward and inclined from the connection point with the fixed portion 37a. The tip of the air guide portion 37b is arranged with a predetermined distance from the outer surface 28b of one of the lower seal members 28. The air guide portion 37b is arranged so that dry air 90 that is supplied from the air supply port 35, flows along the air guide portion 37b, and reaches the tip is blown onto the outer surface 28b of the lower seal member 28.

The disperser 4 is arranged below the powder feeder 3. The disperser 4 supplies the flocculant 70 supplied from the powder feeder 3 to the dissolution tank 60 together with dissolution water 80 that dissolves the flocculant 70. As shown in FIG. 1, the distributor 4 has a cylindrical body 38 having a substantially square cross-sectional shape in the horizontal direction. The distributor 4 has elongated support pieces 39 along opposing side walls 38a of the cylindrical body 38. The cylindrical body 38 is supported on a bracket 40 attached below the pedestal 17 via these supporting pieces 39 .

The cylinder 38 has an inspection lid 42 on the front wall 38b. The inspection lid 42 is attached at the lower end via a hinge 41 and locked in the closed state by a fixing means 43 at the upper end. The cylindrical body 38 has a water supply port 44 on the back wall 38c. Water supply port 44 is connected to water supply socket 45 (FIG. 2).

The disperser 4 has a water film rectifying plate 46 that guides the dissolved water 80. Approximately the upper half of the water film rectifying plate 46 is disposed within the cylinder 38, and the other portion is exposed from the cylinder 38. The water film current plate 46 has a partition portion 46a and an inclined portion 46b connected to the lower end of the partition portion 46a.

The partition part 46a is fixed to the cylinder body 38 above the cylinder body 38 while maintaining a constant distance from the rear wall 38c and the upper end 38d of the cylinder body 38, and has a space between it and the rear wall 38c for storing the dissolved water 80. Form. The stored dissolved water 80 flows along the wall surface of the partition 46a to the extent that it overflows from the upper end of the partition 46a, forming a water film.

The end of the inclined portion 46b opposite to the end connected to the partition portion 46a is inclined downward toward the dissolution tank 60 installed below the disperser 4. The dissolved water 80 flowing along the partition portion 46a further flows down the slope portion 46b while forming a water film.

The water film straightening plate 46 is made of a water-repellent material so that the flocculant 70 having hygroscopic properties does not adhere to it, and even if the flocculant 70 accumulates on the slope portion 46b, it can be easily removed. Further, the water film rectifying plate 46 may be formed of a water-repellent resin. Examples of the water-repellent material or water-repellent resin include silicone rubber or resin, fluororesin, and Teflon (registered trademark).

The dissolution tank 60 is a tank that dissolves the flocculant 70 supplied from the disperser 4 (supply device 1) in water. The flocculant 70 dissolved in the dissolution tank 60 is supplied to a reaction tank (not shown) provided on the downstream side.

Next, the operation of the supply device 1 will be explained.

First, the powder flocculant 70 in the hopper 2 is supplied to the powder feeder 3. In the powder feeder 3, the flocculant 70 temporarily stays in the space formed by the outer circumferential surface 12a of the upper rotor 12 and the pair of powder guide plates 25a, 25b. As the upper rotor 12 rotates, the flocculant 70 is discharged from the gap between the outer circumferential surface 12a and the powder guide plate 25b, and moves while remaining on the outer circumferential surface 12a. It then falls naturally from the outer circumferential surface 12a due to gravity and is supplied to the lower rotor 13. The amount of flocculant 70 supplied per unit time is controlled by this gap and the rotation speed of the upper rotor 12, and it is quantitatively sent to the lower rotor 13.

The lower rotor 13 rotates while contacting the lower seal member 28, and the flocculant 70 is discharged from a small gap between the outer peripheral surface 13a and the lower seal member 28. The flocculant 70 that has fallen into the disperser 4 is supplied to the dissolution tank 60 while being mixed with the dissolution water 80.

From the viewpoint of stable supply, it is preferable for such a supply device 1 to supply the flocculant 70 without absorbing moisture, that is, maintaining the powder state until it is mixed with the dissolved water 80. If the flocculant 70 absorbs moisture, it may accumulate on the lower rotor 13, for example, and there is a risk that constant supply may not be performed or clogging may occur. This is particularly likely to occur when the outer circumferential surface 13a of the lower rotor 13 and the lower end 28c portion of the lower seal member 28 become moist due to the dissolved water 80, and the lower end 28c and outer circumferential surface located in the non-sealed space 11b. The flocculant 70 that has absorbed moisture remains in the flocculent 13a, and if it continues to absorb moisture from the dissolved water 80, it becomes "icicle" shaped. In addition, particles of the flocculant 70 tend to adhere to the "icicle"-shaped portions, and there is a risk that the flocculant 70 may unintentionally become larger. In such a case, the workload during maintenance increases, resulting in the supply device 1 being difficult to use. This also applies during the period when the supply device 1 is not operating, and some kind of countermeasure is essential.

Therefore, the supply device 1 in this embodiment is provided with a structure that can supply dry air 90 near the discharge point of the powder feeder 3. In addition, when the powder feeder 3 is not supplying the flocculant 70 to the disperser 4 (when the supply device 1 is stopped), dry air 90 is supplied to the non-sealed space 11b of the powder feeder 3. , the discharge point of the flocculant 70 of the powder feeder 3 is always kept dry.

This can prevent the flocculant 70 adhering to the outer surface 28b and lower end 28c of the lower rotor 13 and the lower seal member 28 located in the non-sealed space 11b from absorbing moisture and becoming agglomerated, as described above.

Furthermore, by having the guide plate 37, the supply device 1 can efficiently dry the outer surface 28b and lower end 28c of the lower rotor 13 and the lower seal member 28, where lumps of the flocculant 70 are most likely to form in the non-seal space 11b. It can be kept in a good condition.

Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention and its equivalents described in the claims.

1 Supply device 2 Hopper 3 Powder feeder 4 Disperser 11 Casing 11a Seal space 11b Non-seal space 12 Upper rotor 12a Outer surface 13 Lower rotor 13a Outer surface 25a, 25b Powder guide plate 26 Upper seal member 28 Lower seal member 28a Plate Spring 28b Outer surface 28c Lower end 35 Air supply port 36 Nozzle 37 Guide plate 38 Cylindrical body 44 Water supply port 45 Water supply socket 46 Water film rectifier plate 60 Dissolution tank 70 Polymer flocculant (flocculant)
80 Dissolved water 90 Dry air

Claims (3)

a hopper for storing powder;
a powder feeder that drops the powder supplied from the hopper in a vertical direction to supply a fixed amount;
a disperser that supplies the powder supplied from the powder feeder to a dissolution tank together with dissolution water that dissolves the powder,
The powder feeder is
It rotates around a rotation axis along a direction substantially perpendicular to the vertical direction, and has an outer circumferential surface on which the powder supplied from the hopper is guided, and the powder on the outer circumferential surface is caused to fall. a rotating rotor that supplies the powder to a disperser;
a sealing member having elasticity that contacts the outer peripheral surface so that the rotating rotor can rotate, and sealing the inside of the powder feeder from moisture of the dissolved water in the disperser;
an air supply port that supplies air for drying a non-sealed space outside the space sealed by the sealing member;
A powder supply device comprising : a guide plate that guides the air toward a surface of the seal member on the non-seal space side . The powder supply device according to claim 1, wherein the air is supplied when the powder feeder is not supplying the powder to the disperser. The powder supply device according to claim 1 or 2 , wherein the powder is a polymer flocculant.

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