JP3750111B2 - Powder feeder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a powder supply apparatus for charging powder such as a polymer flocculant into a liquid such as a dissolution tank.
[0002]
[Prior art]
As described in JP-A-10-216736, polymer flocculants for promoting solid-liquid separation are generally poor in solubility, and when put into liquid as they are, they adhere to each other before being dispersed and dissolved. A matching splint is produced and wasted wastefully. In addition, even before the liquid is put into the liquid, if moisture from the dissolution tank or the like is absorbed and bonded to each other, the powder supply path is blocked, the powder (polymer flocculant) bridging phenomenon, condensation occurs, Troubles such as adhesion and accumulation of powder on the wall surface occur.
[0003]
Therefore, a drying means such as sending drying air into the powder supply path or a moisture preventing means for preventing moisture from entering is taken.
[0004]
For example, in the invention described in JP-A-10-216736, the powder is sprayed into the mixing chamber together with the low-pressure air flow from the powder spray nozzle, so that the powder is dispersed and dissolved in a mixed state with air. The tank is supplied.
[0005]
Also, as shown in FIGS. 1 and 2, in the feed hopper 50 for supplying the powder (polymer flocculant), in order to prevent moisture from entering, between the lower ends of the inclined side plates 51 on both sides thereof, A discharge rotor 52 having a triangular cross section is installed, and the lower end portion of the side plate 51 is always pressed against the discharge rotor 52 by a plate spring action, and the pressed portion is sealed with a rubber packing (not shown). A structure is known in which the powder in the feed hopper 50 is pushed out by a fixed amount by rotation.
[0006]
[Problems to be solved by the invention]
However, when the powder is dispersed and supplied as described above, the drop opening must be enlarged, so that the ingress of moisture is large, and also when the powder is pushed out of the feed hopper by the discharge rotor, the discharge rotor Since the powder was soaked in water and dropped into the dissolution tank while forming a water film, moisture from the water film was attached to the discharge rotor. Therefore, in any of the conventional cases, it is insufficient to prevent moisture from entering from the dissolution tank, and the phenomenon that the powder absorbs moisture and adheres to each other by the time the powder is put into the solution tank is unavoidable. The trouble as described above still occurred.
[0007]
The object of the present invention is to reliably prevent moisture from entering from the solution tank, eliminate the phenomenon of moisture adhering to each other before the powder is put into the solution tank, etc. An object of the present invention is to provide a powder supply apparatus that can be dispersedly charged.
[0008]
[Means for Solving the Problems]
The powder supply apparatus of the present invention includes a feed hopper that supplies powder, a discharge pipe connected to the feed hopper, a damper that opens and closes a discharge port of the discharge pipe, and rotates in the discharge pipe. A screw conveyor that transports the powder inside to the discharge port and pushes the damper with the powder, and is provided at the tip of the screw conveyor. A powder exclusion member to be excluded, and a drop hopper that includes the discharge port of the discharge pipe including the damper, and drops the powder carried out of the discharge port while the heat air is supplied from the heat air supply source. The damper is urged in a closing direction by a spring, and the powder rejection member has a flange that contacts the inner surface of the damper and a powder passage opening .
[0009]
According to such a structure, intrusion of moisture from the feed hopper to the discharge port of the discharge pipe is prevented by the screw conveyor, and moisture intrusion from the discharge port of the discharge pipe enters the drop hopper in addition to the damper. It is also prevented by the heat air that is sent in, and the intrusion of moisture from the drop port of the drop hopper is prevented by the heat air that is sent into the drop hopper. The powder discharged from the discharge port of the discharge pipe while pushing the damper open is dried and dispersed by being mixed with heat air in the drop hopper, and is put into a dissolution tank or the like. Moreover, the inside of the drop hopper can be dried with heat air before the step of dropping the powder quantitatively from the discharge port of the discharge pipe through the inside of the drop hopper.
[0010]
The damper is automatically pushed open by the powder conveyed by the screw conveyor, but when the screw conveyor is stopped, the powder remains between the tip of the screw conveyor and the damper, and the damper is completely closed. There is a fear of not being in a state. In such a state, moisture from the drop hopper enters the discharge pipe while the operation is stopped.
[0011]
However, once the screw conveyor is stopped and then reversed, the powder removal member at the tip of the screw conveyor removes the powder, so the damper is sealed, preventing moisture from entering the discharge pipe when the operation is stopped Is done.
[0012]
The damper may have a sharpened tip edge of the collar portion of the powder exclusion member.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in detail with reference to the drawings.
[0014]
3 and 4, the slightly vertical feed hopper 1 is mounted on the frame 4 together with the feed motor 2 and the gear box. The feed hopper 1 opens the upper lid 5, puts a powder such as a polymer flocculant from the upper surface opening, and then seals the upper surface opening with the upper lid 5. The feed hopper 1 is provided with a transparent inspection window 1a.
[0015]
As shown in FIG. 6, the lower half of the feed hopper 1 has a V shape that narrows toward the lower end, and the bridge prevention / feed auxiliary rotor 6 is horizontally supported at an intermediate position inside the feed hopper 1. This feed auxiliary rotor 6 is provided with a plurality of long stirring blades 6a inclined in parallel to the axis as shown in FIG. 7 on the outer periphery of the horizontally long barrel portion. Communicated.
[0016]
A discharge pipe 7 is connected to one end of the lower end portion of the feed hopper 1. As shown in FIGS. 5 and 7, a screw conveyor 8 that is rotated by the feed motor 2 is inserted into the discharge pipe 7. The screw conveyor 8 is inserted into the discharge pipe 7 after reaching the entire length of the lower end in the feed hopper 1. And the screw conveyor 8 is extended to the discharge port 7a of the front-end | tip of the discharge pipe 7, as shown in FIG. 5, without producing a clearance gap between the spiral blade 8a of the outer periphery, and the inner peripheral surface of the discharge pipe 7. .
[0017]
In the illustrated screw conveyor 8, the outer diameter of the body portion of the length portion located at the lower end portion in the feed hopper 1 is gradually increased toward the discharge pipe 7. However, the outer diameter of the spiral blade 8a is the same. In this way, the powder can be smoothly fed from the feed hopper 1 into the discharge pipe 7, but the powder can be sufficiently fed into the discharge pipe 7 without reaching that point.
[0018]
The screw conveyor 8 transmits the rotation of the feed motor 2 through a chain, and the feed auxiliary rotor 6 is transmitted through a gear in the gear box 3 and rotates simultaneously with the screw conveyor 8. The speed reduction ratio is different from that of the feed auxiliary rotor 6, and the feed auxiliary rotor 6 rotates at a higher speed than the screw conveyor 8.
[0019]
Therefore, the powder 9 in the feed hopper 1 is forcibly pushed into the screw conveyor 8 from above without being agitated by the feed auxiliary rotor 6 and causing a bridge phenomenon. The screw conveyor 8 pushes the powder 9 thus pushed into the discharge pipe 7, and conveys the powder 9 to the discharge port 7a while preventing the moisture from entering by the spiral blade 8a. The feed auxiliary rotor 6 is auxiliary to the screw conveyor 8 and may be omitted.
[0020]
On the outside of the discharge port 7a, a disk-shaped damper 10 that opens and closes the discharge port 7a is pivotally attached to the upper end by a hinge 11 as shown in FIG. 9, and normally the spring 12 closes the discharge port 7a. As shown by the broken line in FIG. 8, the discharge port 7a is opened by being pushed by the powder 9 fed by the screw conveyor 8.
[0021]
As shown in FIGS. 5 and 8, a drop hopper 13 that includes the discharge port 7 a including the damper 10 is detachably attached to the distal end portion of the discharge pipe 7. The drop hopper 13 is held by the discharge pipe 7 by fitting a cylindrical support portion 13 b protruding to the rear side of the trunk portion 13 a to the outer periphery of the distal end portion of the discharge pipe 7.
[0022]
A transparent inspection port 13 c is formed on the front surface of the body portion 13 a of the drop hopper 13. A flanged pipe joint 13d protrudes from the upper end of the body portion 13a, and a funnel portion 13f that protrudes toward the drop port 13e at the lower end protrudes from the lower side of the body portion 13a.
[0023]
The drop hopper 13 is pipe-connected to a heat air supply unit (heat air supply source) 14 using the pipe joint 13d, and heat air from the heat air supply unit 14 is fed from the upper end. Since the funnel portion 13f of the drop hopper 13 is recessed toward the dropping port 13e, the inside of the drop hopper 13 is in a state where an internal pressure by heat air is applied. In addition, the diameter of the drop port 13e can be made as small as possible. In such a state, since heat air is blown downward from the small drop port 13e, moisture intrusion into the drop hopper 13 is suppressed.
[0024]
Accordingly, around the discharge port 7 a of the discharge pipe 7, heat air is blown in the drop hopper 13 including the damper 10, and the powder 9 discharged from the discharge port 7 a while pushing the damper 10 open by the screw conveyor 8. Is dropped from the dropping port 13e and put into a dissolution tank or the like while being dried and dispersed by mixing with heat air in the drop hopper 13. Further, since the powder 9 follows the flow of the heat air even when it is dropped outside the drop port 13e, the powder 9 falls to the liquid surface while preventing moisture absorption by the heat air.
[0025]
Such a powder supply operation is intermittently performed in fixed amounts, but since the heat air is sent in advance into the drop hopper 13 in the above-described state before supplying the powder in a fixed amount, Before the body 9 enters the drop hopper 13 from the discharge pipe 7, the inside of the drop hopper 13 is also dried including the damper 10. Further, during the suspension of the quantitative supply of the powder 9, the damper 10 closes the discharge port 7 a of the discharge pipe 7, and internal pressure by heat air is also applied, so that moisture enters the discharge pipe 7, the damper 10 and the drop Moisture adherence to the hopper 13 is prevented.
[0026]
By the way, the damper 10 is urged by the spring 12 in the direction of closing the discharge port 7a of the discharge pipe 7, but while the powder 9 is being conveyed by the forward rotation of the screw conveyor 8, the powder 9 It is pushed against the spring 12. FIG. 10 shows this state.
[0027]
However, when the screw conveyor 8 is stopped, the conveyance of the powder 9 is stopped, but since the internal pressure is applied to the powder 9, the damper 10 cannot be closed even if it is closed, as shown in FIG. Then, the powder 9 is sandwiched between the inner surface of the damper 10 and the edge of the discharge port 7a, and the damper 10 is not completely closed. When the sealing of the discharge port 7a by the damper 10 is incomplete while the screw conveyor 8 is stopped, moisture from the lower part enters from the discharge port 7a, and the powder 9 in the discharge pipe 7 absorbs the moisture.
[0028]
Therefore, in order to prevent this, in the present invention, the following circular powder exclusion member 15 is attached to the tip of the screw conveyor 8. FIG. 12 is a mounting view thereof, FIG. 13 is a single view of the powder exclusion member 15, and FIG. 14 is an exploded view of the screw conveyor 8, the powder exclusion member 15 and the damper 10.
[0029]
The powder excluding member 15 includes a core portion 15a, a flange portion 15b, a rib 15c that branches, for example, and a powder passage port 15d surrounded by the rib 15c. The leading edge is sharp. The front and back thickness of the flange portion 15b is thicker than that of the core portion 15a and the rib 15c, and the sharp tip edge of the flange portion 15b protrudes from the core portion 15a and the rib 15c. A screwing hole 15e is provided at the center of the core portion 15a, and the powder exclusion member 15 uses the screwing hole 15e and a screw hole 8b provided in the center of the front end surface of the screw conveyor 8 to fix the fixing screw 16e. Is fixed to the tip of the screw conveyor 8 and rotates integrally with the screw conveyor 8 outside the discharge port 7a. At that time, the rear surface of the flange portion 15b of the powder exclusion member 15 is in sliding contact with the edge of the discharge port 7a, and the sharp tip edge of the flange portion 15b is in contact with the inner surface of the damper 10 biased by the spring 12. Sliding contact is possible.
[0030]
Since the screw conveyor 8, the powder exclusion member 15 and the damper 10 have such a relationship, when the screw conveyor 8 rotates forward as shown in FIG. 15, the powder 9 is discharged by the screw conveyor 8. Since it is conveyed to the outlet 7 a and passes through the passage port 15 d of the powder exclusion member 15 and is pushed out from the discharge port 7 a, the damper 10 is pushed open by the powder 9. At this time, since the damper 10 is separated from the flange portion 15b of the powder exclusion member 15, the powder 9 falls so as to pass through the gap between the damper 10 and the flange portion 15b.
[0031]
When the screw conveyor 8 stops, as shown in FIG. 16, the damper 10 tries to close by urging by the spring 12, but because the internal pressure is applied to the powder 9, the damper 10 cannot be closed, The powder 9 is sandwiched between the damper 10 and the powder exclusion member 15, particularly between the inner surface of the damper 10 and the flange portion 15 b, and the inner surface of the damper 10 has the entire periphery of the flange portion 15 b. Therefore, the discharge port 7a is not hermetically sealed.
[0032]
Therefore, when the screw conveyor 8 is reversed as shown in FIG. 17, the powder 9 in the discharge pipe 7 is pushed back, the internal pressure is reduced, the pressure of the damper 10 is increased, and the powder exclusion member 15 is replaced by the screw conveyor. 8, the powder remaining between the damper 10 and the powder exclusion member 15 is cut off by the powder exclusion member 15, and as shown in FIG. Is pressed against the entire periphery of the flange 15b, and the discharge port 7a is sealed. At this time, the leading edge of the flange portion 15b is sharper than the core portion 15a and the rib 15c, so that it is between the leading edge of the flange portion 15b and the inner surface of the damper 10 and the inner periphery of the damper 10. The powder 9 does not remain between the surface and the core portion 15a and the rib 15c, and the damper 10 is reliably sealed.
[0033]
When the screw conveyor 8 is rotated forward, the powder 9 is advanced while converging as shown in FIG. 19A, and when the screw conveyor 8 is reversed, it is pushed back while being diffused as shown in FIG. 19B. As shown in FIG. 20, a diffusion guide 17 is provided at the rear end of the screw conveyor 8 so that the back-back at the time of reverse rotation can be smoothly performed along the inner surface of the feed hopper 1 at the rear end of the screw conveyor 8. Yes.
[0034]
【The invention's effect】
As described above, according to the present invention, the powder such as the polymer flocculant is adhered to each other by moisture until it falls from the feed hopper through the discharge pipe and the drop hopper to the liquid level. The powder can be dissolved in a completely dry and dispersed state, preventing wasteful consumption, as well as clogging of the supply path, bridging phenomenon, occurrence of condensation, adhesion deposition on the wall, etc. Trouble disappears.
[0035]
When the screw conveyor is temporarily stopped and then reversed, the powder removing member at the tip of the screw conveyor removes the powder, so that the damper can be sealed to prevent moisture from entering the discharge pipe while the operation is stopped.
[0036]
According to the invention which concerns on Claim 2, powder can be discharged | emitted from a discharge pipe through the passage port of a powder exclusion member.
[0037]
According to the invention which concerns on Claim 3, since the front-end edge of the collar part of the powder exclusion member was sharpened, a damper can be sealed reliably.
[Brief description of the drawings]
FIG. 1 is a simplified cross-sectional view of a conventional example.
FIG. 2 is a perspective view of a part of the above.
FIG. 3 is an external side view of an embodiment of the present invention.
FIG. 4 is a front view of the same.
FIG. 5 is a simplified cross-sectional view.
FIG. 6 is a cross-sectional view showing a structure inside a feed hopper.
FIG. 7 is a cross-sectional view of the same part as that of FIG.
FIG. 8 is a cross-sectional view of a distal end portion of a discharge pipe and a drop hopper.
FIG. 9 is a front view showing a state where the damper is mounted.
FIG. 10 is a partial cross-sectional view showing the operation of the damper when no powder exclusion member is provided.
FIG. 11 is a similar view showing that the damper is not hermetically sealed in the same as above.
FIG. 12 is a partial cross-sectional view when a powder exclusion member is provided.
13A is a front view of a powder exclusion member, and FIG. 13B is a cross-sectional view.
FIG. 14 is an exploded perspective view of a screw conveyor, a powder exclusion member, and a damper.
FIG. 15 is a partial cross-sectional view showing the operation of the damper when a powder exclusion member is provided.
FIG. 16 is a similar view when the screw conveyor stops in the same as above.
FIG. 17 is a similar view when the screw conveyor is reversed.
FIG. 18 is a similar view showing a state where the damper is sealed.
19A is a cross-sectional view showing the movement of powder when the screw conveyor is rotating forward, and FIG. 19B is a cross-sectional view showing the movement of powder when rotating backward.
FIG. 20 is a cross-sectional view showing a diffusion guide at the rear end of the screw conveyor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Feed hopper 1a Inspection window 2 Feed motor 4 Frame 5 Upper cover 6 Bridge auxiliary and feed auxiliary rotor 6a Stirring blade 7 Discharge pipe 7a Discharge port 8 Screw conveyor 8a Spiral blade 8b Screw hole 9 Powder 10 Damper 11 Hinges 12 Spring 13 Drop Hopper 13a Body portion 13b Cylindrical support portion 13c Inspection port 13d Pipe joint 13e Drop port 13f Funnel portion 14 Heat air supply unit 15 Powder exclusion member 15a Core portion 15b Gutter portion 15c Rib 15d Passage port 15e Screw fixing hole 16 Fixing screw 17 Diffusion guide

Claims (2)

A feed hopper for supplying powder, a discharge pipe connected to the feed hopper, a damper for opening and closing a discharge port of the discharge pipe, and rotating in the discharge pipe, the powder in the feed hopper is discharged from the discharge hopper. A screw conveyor that conveys to the outlet and pushes the damper with powder, and is installed at the tip of this screw conveyor, and with the reverse rotation, removes powder from between the tip of the screw conveyor and the damper and member, wherein the outlet of the discharge pipe encapsulating, including the damper, the powder coming carried out from the discharge port, e Bei a drop hopper for dropping while being fed to heat air from the heat air supply source, the damper is urged in a closing direction by a spring, the powder removing member is claim 1, characterized in that it comprises an inner surface of the damper abutting the flange portion, and a powder passage holes Powder supplying device according. 2. The powder supply apparatus according to claim 1 , wherein a tip edge of the flange portion of the powder exclusion member is sharpened.

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