JPH0131308Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a discharge device for a storage tank that stores substances that tend to get entangled, such as organic fibrous solids.

(Prior art) Organic fibrous solids, such as granulated tree bark,
Quantitative performance is strictly required when supplying wood flour to a wood flour boiler or solidification device used as fuel, but there has been no storage tank discharge device that can adequately meet such usage conditions.

(Problems to be solved by the invention) As mentioned above, when feeding organic fibrous solids, such as granulated wood bark, to a wood powder boiler or solidification device that is used as fuel, quantitative performance is strictly required. However, the fibers of organic fibrous solids tend to become entangled and cause bridging in the storage tank, and since the specific gravity is low, the fluidity is poor and it is very difficult to discharge and supply in a fixed quantity. In addition, it has long been known that stirring is the most effective method for preventing blistering, but for fibrous solids with extremely poor fluidity, the power required is extremely large, so the storage The structure of the tank must be made strong enough to withstand the required power, making the structure of the device large and increasing the cost.Therefore, it has been desired to develop a suitable storage tank discharge device.

This invention prevents the occurrence of bridging by loosening the entanglements of stored substances such as organic fibrous solids in the storage tank, and facilitates the flow of the solids to supply a fixed amount to wood flour boilers and solidification equipment. To provide a storage tank discharge device that can

(Means for Solving the Problems) A storage tank discharge device according to the present invention rotates within a storage tank that is shaped like an upright cylinder and has a discharge port provided in the bottom plate, and guides the stored material to the discharge port. In a storage tank discharge device, there is a fixed part that is fixed to the rotational drive shaft, and a protrusion is provided on both sides of the fixed part so that the end angle in the direction of the rotational axis is formed at an acute angle and the rear side is inclined upward with respect to the rotational direction. a stirring arm consisting of both plate-shaped arms, and a stirring blade consisting of a plurality of angle members fixed asymmetrically to the fixed part with an inclination in the same direction as both arms, and This is a storage tank discharge device having a. Preferably, the stirring blade is fixed to the stirring arm of the angle member in a manner oblique to the radial direction of the storage tank.

(Function) When the rotary drive shaft is driven, the plurality of stirring blades loosens the entanglements of the accumulated material, prevents the formation of bridges, and allows the accumulated material gathered by the stirring arm to continue to the discharge port provided on the bottom plate. can be supplied. Also,
If the stirring blade is fixed to the stirring arm in a direction oblique to the radial direction of the storage tank, the stored material can be evenly stirred.

(Example) An example of the stored material discharge device according to the present invention will be described based on the drawings.

In FIGS. 1 and 2, 1 is a vertical cylindrical storage tank for organic fibrous solids, 1a is the bottom plate of the storage tank 1, and a discharge port 1b is located avoiding the center of the tank.
is provided. The storage tank 1 is attached to a frame 2a on the fixed leg 2.
It is fixed on the board. Reference numeral 3 designates a rotation drive shaft, and a stirring arm 4 is fixed to the tip thereof, and the stirring arm 4 rotates with a small gap between its lower surface and the upper surface of the bottom plate 1a of the storage tank. 5 is a stirring blade fixed to the stirring arm 4, 6 is a biaxial two-row screw feeder, the tip of which is located below the discharge port 1b, and is rotated by a drive device (not shown). The organic fibrous solids to be stored are supplied from the discharge port 1b of the storage tank to a two-screw two-screw feeder 6, and are quantitatively supplied from the outlet 6a to an external wood flour boiler or solidification device.

Note that by making the drive device of the screw feeder variable, the supply amount can be adjusted arbitrarily.

Details of the stirring arm 4 and stirring blade 5 will be explained based on FIGS. 3 to 5. The stirring arm 4 consists of a plate-shaped right arm 4a, a left arm 4b, and a boss portion 4c which is a fixed portion. Both arms 4a and 4b are
The tips in the direction of rotation shown by the arrows are formed at an acute tip angle (θ ₂ ), and each inner edge is tilted (θ ₁ ) so that the rear side faces upward with respect to the turning direction. It is fixed to the boss portion 4c by welding or the like. Each stirring blade 5 cuts the tip of an angle member to approximately a tip angle (θ ₂ ), and the cut surface is fixed to the stirring arm 4, and is fixed to a plurality of right stirring blades 5a and left arm 4b fixed to the right arm 4a. The plurality of left stirring blades 5b are all asymmetrical with respect to the boss part 4c, that is, the distances from the center of the boss part 4c are different, and the respective ridgelines 5a', 5
Inclination of the arm (θ ₁ ) + tip angle (θ ₂ ) that approximately stirs b′
, and is arranged with respect to the boss portion 4c at an inclination (θ ₃ ) in the same direction as both arms. The stirring blade 5 has a ridgeline 5a', a ridge line 5a' formed by rotation of the stirring blade 5, in order to thoroughly untangle the stored material.
The angle member is not made perpendicular to the radial direction of the storage tank 1 (see Fig. 2), but is moved obliquely to the stirring arm 4 so that the locus of 5b' broadly contacts the cross section of the storage tank 1. It is fixed.

The stirring arm 4 mainly serves to scrape up the stored material and supply it to the discharge port 1b, and also has an auxiliary loosening action. For this purpose, the inclination (θ ₁ ) and tip angle (θ ₂ ) of the stirring arm 4 and the stirring blade 5
The inclination (θ ₃ ) of the stirring arm 4 with respect to the boss portion 4c is
In consideration of the plate width, the angle of repose of the stored material, etc., the angle is determined so that the stored material can be efficiently supplied to the discharge port 1b and the stirring resistance can be minimized.

In the storage tank discharge device configured as described above, when the rotary drive shaft 3 is driven, the stirring arm 4, which has a slight gap with the bottom plate 1a of the storage tank, rotates together with the stirring blade 5. The stirring blade 5 loosens the entanglements of the stored tanks in the storage tank 1 to prevent the formation of bridges, and the stirring arm 4 continuously supplies the collected materials to the discharge port 1b. By rotating the screw feeder 6, a fixed amount can be supplied to an external wood flour boiler, solidification device, etc.

A test was conducted under the following conditions using the storage tank discharge device according to the present invention.

Storage: Wood flour Storage tank capacity: 5m ² Stirring arm rotation speed: 4rpm Stirring power: 5.5kw Purpose of use: Supply wood flour to wood flour combustion furnace.

The results of the above test are shown in FIG. The vertical axis shows the amount of wood powder discharged (Kg/hr), and the horizontal axis shows the screw rotation speed (rpm) of the two-screw feeder. As is known from the diagram, the discharge amount (Kg/hr) has a linear relationship with the screw rotation speed of the two-screw feeder, indicating that bridging in the storage tank is well prevented. ing.

(Effect of the invention) According to the storage tank discharge device according to the invention, even if the stored material in the tank is easily tangled, such as organic fibrous solid matter, it can be discharged in a fixed amount without causing bridging. became possible. In addition, the stirring blade
Since it is fixed to the stirring arm with the rear side facing upward with respect to the direction of rotation, the power cost required for stirring can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing a feeding device for organic fibrous solids using a storage tank discharge device according to the present invention, and FIG. 2 is a plan view showing the main parts of the feeding device.
FIG. 3 is a plan view of the storage tank discharge device according to the present invention, FIG. 4 is a front view thereof, and FIG. 5 is a side view showing how the stirring arm and stirring blade are attached. FIG. 6 is a diagram showing the test results of the organic fibrous solid material supply device using the storage tank discharge device according to the present invention. 1... Storage tank, 1b... Discharge port, 3... Rotation drive shaft, 4... Stirring arm, 4a... Right arm, 4b...
...Left arm, 4c...Boss part (fixed part), 5...Stirring blade, 5a...Right stirring blade, 5a'...Ridge line, 5b...Left stirring blade, 5b'...Ridge line, θ ₁
...Inclination of the stirring arm so that the rear side faces upward with respect to the rotating direction, θ ₂ ...Tip angle of the stirring arm, θ ₃ ...θ ₁
+θ ₂ (Inclination of the ridge of the stirring blade in the same direction as the stirring arm).

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a storage tank discharging device that rotates in a vertical cylindrical storage tank with a discharge port provided in the bottom plate and guides the stored material to the discharge port, a rotary drive shaft is provided. A stirrer consisting of a fixed part that is fixed to a fixed part, and plate-shaped arms on both sides of which are formed with an acute angle at the tip on the rotation direction side and protrude with the rear side facing upward with respect to the rotation direction. Discharge of a storage tank characterized by having an arm and a stirring blade on both arms, which is made up of a plurality of angle members fixed asymmetrically to a fixed part with an inclination in the same direction as both arms. Device. (2) The storage tank discharging device according to claim 1, wherein the stirring blade has an angle member fixed to the stirring arm with the angle member running obliquely with respect to the radial direction of the storage tank.