JP3429980B2 - Silo dispensing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silo dispensing device for discharging a fixed amount of sewage sludge dewatering cake stored in a silo, and particularly to a silo dispensing device suitable for discharging a polymer-based dewatering cake. It is about.

[0002]

2. Description of the Related Art In recent years, polymer-based dehydrated cakes whose discharge from sewage treatment plants has increased are highly viscous cakes having a water content of 72 to 82%, and are sent to the subsequent processes such as incineration and melting. Before being stored, it is stored in a prismatic hopper called a constant quantity feeder. Then, at the bottom of the hopper, a dispensing device for discharging the stored sewage sludge dewatering cake by a fixed amount is provided.

A screw type dispenser is generally used. However, the screw type dispenser
In order to evenly cut out the dehydrated cake from the entire bottom surface of the hopper, a large number of screws must be arranged, which causes a problem that the structure is complicated and the apparatus becomes expensive. Therefore, a rotary blade-type silo dispenser was also developed in which the rectangular hopper was made into a circular silo shape, the rotary blade was provided on the bottom surface of the silo, and the rotating force pushed out the dehydrated cake toward the outlet on the bottom surface of the silo. ing. However, in this rotary vane type, the rotary vanes rotated in a dehydrated cake having a high viscosity have an excessive rotational resistance, which may damage the device.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, has a simple structure, and can evenly cut out a dehydrated cake from the entire bottom surface of a silo, and is subjected to excessive rotation resistance. The purpose of the present invention is to provide a silo dispensing device which is not likely to be destroyed even if the device is damaged.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the invention of claim 1 has a silo discharge device having a discharge port on the bottom surface of a silo and rotary blades attached to a rotation center drum. In this case, this rotary blade is formed in a rhombic section with a sharp front surface in the direction of rotation, and
The rotary vane of the surface, diagonally rearward along the pointed front.
It extends in a V shape and bends when rotation resistance acts, causing rotation resistance.
It is characterized in that a spring plate for reducing the resistance is projected . The invention of claim 2 has a discharge port on the bottom surface of the silo ,
In silo dispenser provided with a rotary blade mounted on the rolling center drum, the rotary blade, the rotation center Dora
Attached to the front of the rotating arm attached to the
When the rotation resistance acts, it bends backward and the rotation resistance
It is characterized by comprising a spring plate having a hanging piece for reducing The invention of claim 3, wherein the vertical
Attach the spring plate with the lower piece to the rotating arm discontinuously
And the silo dispensing device . Na us, can be attached tangentially rotating blades in each case with respect to the rotation center drum of the bottom of the silo. Each invention will be described below together with preferred embodiments thereof.

[0006]

DETAILED DESCRIPTION OF THE INVENTION (Invention of Claim 1) FIGS. 1 to 5 (spring plate 5 is omitted in FIGS. 1 to 4)
FIG. 3 shows a preferred embodiment of the invention of FIG. Reference numeral 1 is a cylindrical silo in which, for example, a highly viscous sewage sludge dewatering cake using a polymer-based coagulant is stored. A discharge port 2 and a rotary blade 3 are provided on the bottom surface of the silo 1. In this embodiment, one discharge port 2 is provided at a position about half the radius of the silo 1, but a plurality of discharge ports 2 may be provided.

As shown in FIG. 2, the rotary blade 3 of this embodiment is tangentially attached to the rotation center drum 4 provided on the bottom surface of the silo 1, and is as shown in the AA sectional view. It has a rhombus cross section. The rhombus is a rhombus having a sharp front surface in the rotation direction, and in the illustrated example, it is a rhombus having horizontal and vertical diagonal lines.

In the silo dispenser thus constructed, when the rotary blades 3 are rotated at a constant speed as shown in FIG. 2, the sewage sludge dewatering cake inside the silo 1 is rotated by the rotary blades 3.
It is pushed by and is discharged from the discharge port 2 by a constant amount according to the rotation speed. At this time, depending on the storage condition in the silo 1, it is inevitable that the rotary blade 3 is subjected to a larger rotational resistance to the sewage sludge dewatering cake having a high viscosity. However, in the invention of claim 1, the rotary blade 3 has a rhombic cross-sectional shape with a sharp front surface in the rotation direction.
Will proceed by cutting out the high-viscosity sewage sludge dewatering cake. Therefore, the rotation resistance is reduced as compared with the conventional rotary blade 3, and the device can be prevented from being broken.

If the rotary blade 3 is tangentially attached to the rotary center drum 4, a force F1 applied at a right angle to the drum center is perpendicular to the surface of the rotary blade 3 as shown in FIG. Is decomposed into force F2 and force F3 in the surface direction,
Since the rotation torque can be reduced, the device can be reliably prevented from being broken. Further, the force F2 has an effect of moving the sewage sludge dewatering cake in the outer peripheral direction of the silo 1. Therefore, if the discharge port 2 is provided on the outer peripheral portion of the silo 1, the sewage sludge dewatering cake is smoothly discharged. The outlet 2 is shown in FIG.
It can also be lengthened as shown in.

As described above, in the first aspect of the invention, it is most preferable that the rotary vane 3 is mounted tangentially to the rotary center drum 4. However, even if it is attached to the rotation center drum 4 in the radial direction as shown in FIG. 4, it is possible to prevent the destruction of the device due to the effect of the rotary blade 3 having a rhombic cross-sectional shape with a sharp front surface in the rotation direction. You can

FIG . 5 is a view showing a concrete embodiment of the invention of claim 1 . As shown in FIG. 5 in the present invention, the
A spring plate 5 extending rearward is projectingly provided on the rotary blade 3 having a rhombic cross section. In this embodiment, the rotary blade 3 has a sharp
Two spring plates 5 are attached to the front in a horizontal V shape,
When a large rotational resistance acts on the rotary blades 3, the spring plate 5 bends as indicated by an arrow to reduce the rotational resistance.
When the rotation resistance is small, the spring plate 5 spreads widely and pushes the sewage sludge dewatering cake toward the discharge port 2.
In this way, the spring plate 5 naturally opens and closes according to the rotation resistance,
It is possible to cut out the sewage sludge dewatering cake accurately while preventing the device from being damaged by rotation resistance.

[0012] (according the invention of claim 2 and 3) Figure 6 is a diagram showing an embodiment of the invention of claim 2 and 3. As shown in FIG. 6, in the invention of claim 2 , the rotary blade 3
And a rotating arm attached to the rotary center drum, its
It is attached to the front side of the
A spring plate having a depending piece to reduce the rotational resistance flexes
As it is. When a large rotational resistance acts on this rotary blade 3, the hanging piece of the spring plate 7 bends backward as shown by the arrow, and the sewage sludge dewatering cake can be accurately prevented while preventing the device from being damaged by the rotational resistance. It is possible to cut out.

According to the third aspect of the present invention, as shown in FIG. 6, the rotary arm 3 is provided with the rotary vane 3 having the discontinuous spring plates 7 and 7. In the invention of claim 3 , since the spring plates 7 and 7 are discontinuous, the spring plates 7 and 7 are more easily bent, and appropriate spring plates 7 are attached to the central portion and the outer peripheral portion of the blade according to the required load. There is an advantage that can be. There is also an effect that the sewage sludge dewatering cake is allowed to escape from the gap between the spring plates 7 and 7 to reduce the rotation resistance.

FIG. 7 is a diagram showing another embodiment of the invention of claim 3. In FIG. In this embodiment, four spring plates 8 are attached to the rotary arm 6 while changing the angle of the front surface. That is,
The outer peripheral side spring plates 8 and 8 are mounted inward, and the inner peripheral side spring plates 8 and 8 are mounted outward. As a result, when the rotary blades 3 rotate, each spring plate 8 pushes the sewage sludge dewatering cake toward the center side as shown by the arrow, so that the discharge port 2 provided at the center position in the radial direction as shown in FIG. The effect of efficiently pushing out the sewage sludge dewatering cake is added.

[0015]

As described above, since the silo dispensing device of each invention of the present application adopts the method of cutting out the sewage sludge dewatering cake by using the rotary blades, it has a simple structure and is cheaper than the screw type silo dispensing device. Can be manufactured. Further, in each invention of the present application, by devising the cross-sectional shape of the rotary vane, it is possible to evenly cut out the dehydrated cake from the entire bottom surface of the silo, while preventing the device from being damaged even when subjected to rotational resistance. There is.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the invention of claim 1.

FIG. 2 is a horizontal sectional view of FIG.

FIG. 3 is a horizontal sectional view showing another embodiment of the invention of claim 1;

FIG. 4 is a horizontal sectional view showing another embodiment of the invention of claim 1.

5A and 5B are a plan view and a sectional view showing a rotary blade of the invention of claim 1 ;

6A and 6B are a plan view and a cross-sectional view showing a rotating blade of the second and third aspects of the invention.

FIG. 7 is a plan view and a sectional view showing another rotary blade of the invention of claim 3 ;

[Explanation of symbols]

1 silo, 2 outlet, 3 rotary blades, 4 rotation center drum, 5 spring plate, 6 rotating arm, 7 spring plate, 8
Spring plate.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliographical flat 6-35236 (JP, U) Actual flat 59-71219 (JP, U) Actual flat 1-36029 (JP, U) Actual flat 61- 171736 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B65G 65/30-65/48 C02F 11/00

Claims (4)

(57) [Claims] 1. A discharge port on the bottom surface of a silo and a rotation center drum.
In a silo dispensing device provided with a rotary blade attached to the rotary blade, the rotary blade is formed in a rhombic cross section with a sharp front surface in the direction of rotation, and
Rotate diagonally rearward in a horizontal V shape along the sharp front and rotate
Spring plate that bends when resistance acts to reduce rotational resistance
A silo payout device characterized by having a protruding portion . 2. A discharge port at the bottom of the silo and a rotation center drum.
In silo dispenser provided with a rotary blade attached to, attaching the rotary blade, the rotational center drum
Attached to the front of the rotating arm
When the resistance acts, it bends backward and reduces the rotational resistance.
A silo dispenser comprising a spring plate having a lower piece . 3. A spring plate having the hanging piece is attached to a rotary arm.
The silo dispensing device according to claim 2, wherein the silo dispensing device is discontinuously attached . 4. The silo dispensing device according to claim 1, wherein the rotary vanes are tangentially attached to the rotation center drum on the bottom surface of the silo.