JP2864063B2 - Adhesion prevention device for automatic weighing machine for powders - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic weighing apparatus for powdery and granular materials which can prevent powdery and granular materials which are weighed by a weighing tank and discharged downward to fill a bag, from adhering to a chute portion thereunder. The present invention relates to a device for preventing adhesion of a machine.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Publication No. 53-2704 and Japanese Utility Model Publication No. 54-18933, a load cell below a supply valve for quantitatively supplying powder can be measured by detecting a load cell. And a measuring tank having an opening / closing shutter at the bottom thereof, and an inverted truncated cone-shaped chute having a small-diameter filling chute on the bagging side is vertically provided below the measuring tank. In the machine, the granular material discharged from the measuring tank adheres to the chute portion, and the amount of the granular material filled in the bag is reduced, causing variation in the measuring accuracy.

[0003]

For this purpose, it is conceivable to vibrate the chute with a vibrating device such as a vibrator or an air cylinder. However, in order to vibrate the chute appropriately, the vibrating device also has a complicated structure. The cost increases significantly, and it is also conceivable to attach Teflon with a low coefficient of friction or Unilite made of reinforced plastic to the inner peripheral surface of the chute. In the case of powdery granules for road marking, which have high properties and high adhesion, there is a problem in that the particles are inevitably adhered and have no effect.

[0004]

The present invention SUMMARY OF THE INVENTION are those such problem was solved, was devised to be prevented reliably attached in any granular material with a simple structure, therefore, granules Load below the supply valve
The cell can be weighed by detecting the cell and the lower
A measuring tank with a
At the bottom, a small-diameter filling
Provided倒截head conical chute with chute, the said shoe <br/> over preparative while the rubber, by applying a slight tension of about 1 0 mm Ri vertical natural length <br/> O of the chute The upper and lower slopes are attached to the upper and lower supports, respectively.
You .

[0005]

Therefore, when the weighed powder is discharged from the weighing tank and falls on the inclined inner peripheral surface of the chute,
Due to the impact force of the drop, a vibration having an amplitude of, for example, about 15 mm is generated, and the vibration promotes the drop without being attached to the chute and being repelled. In addition, high pressure air is blown from the inner peripheral surface of the filling chute for holding the opening side of the bag and guiding the granular material to the opening, thereby preventing adhesion to the filling chute and promoting falling. it can.

[0006]

FIG. 2 is a front view schematically showing an automatic weighing machine for powdery and granular materials. Inside an upper body 10, the weighing can be performed by detecting a load cell 2 and both open / close shutters 3,
And two weighing tanks 4 and 4 each having an auxiliary hopper 11 above the weighing tanks 4 and 4.
The two supply valve portions 1 and 1 are capable of supplying the fixed amount to the two measuring tanks 4 and 4 by opening the lower shutter 1 a while quantifying the granular material A stored in the lower and upper sides through the lower supply cylinder 12.
The inverted frusto-conical chute 6 vertically hanging below the measuring tanks 4 and 4 is made of rubber, and the vertical length L of the chute 6 is slightly smaller than its natural length by about 10 mm. The upper and lower portions are attached to upper and lower supports 7 and 8, respectively, and the lower portion of the chute 6 is connected to the upper portion of a small-diameter filling chute 6 on the bag-packing side. The ring 6 has a cavity shape as shown in FIG. 3 and has a large number of blast holes 13 formed in the inner peripheral surface, and an air hose 15 from the compressor side communicates with an intake port 14 provided in the outer peripheral surface. A high pressure air can be fed by being connected in series, and a clamp device 9 is provided on the outer periphery of the lower side of the filling chute 5 so that the opening of the bag B can be fitted and attached.

Therefore, as shown in FIG. 1, when the opening of the bag B is fitted to and attached to the clamp device 9, the opening and closing shutters 3, 3 are opened, and the measured powder A is discharged to one side. When discharged from the measuring tank 4 and dropped on the inner peripheral surface of the chute 6, the chute 6 vibrates with an amplitude of about 15 mm as shown by both dotted lines in FIG. Due to the vibration, the granular material does not adhere to the chute 6 and is promoted to fall while being repelled. The granular material A is held in the opening while holding the opening side of the bag B.
High pressure air is blown out from the inner peripheral surface of the filling chute 5 as indicated by arrows from the inner peripheral surface of the filling chute 5 to prevent powder and granules from adhering to the inner peripheral surface of the charging chute 5 and fall. Can be promoted.

[0008]

As described above, according to the present invention, when the weighed granular material A is discharged from the weighing tank 4 and falls on the inner peripheral surface of the chute 6, the amplitude of about 15 mm As a result, the granular material A does not adhere to the chute 6 and is promoted to fall while being repelled by the vibration. The high-pressure air is ejected from the inner peripheral surface of the filling chute 5 for holding and guiding the powder A to the opening, thereby preventing the chute 5 from adhering to the filling chute 5 and promoting the fall. Even dusts with high dustiness and adhesion can be reliably prevented from adhering to the chute, and can be bagged with high weighing accuracy. Vibration structure It has the advantage that can be suitably carried out is possible to.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of an embodiment of the present invention.

FIG. 2 is a sectional view schematically showing the entire automatic weighing machine.

FIG. 3 is a sectional view showing a filling chute.

[Explanation of symbols]

 Reference Signs List A powder 1 granule 1 supply valve 2 load cell 3 opening / closing shutter 4 measuring tank B bag 5 filling chute 6 chute 7,8 supporting metal 9 clamp device

Claims (1)

(57) [Claims] 1. A granular material in the lower quantification supplies supply valve unit 1 A is provided with measuring tank 4 having a closing shutter 3 at the bottom is possible weighing Ri by the detection of the load cell 2, immediately below the metering tank 4 An inverted truncated cone-shaped chute 6 having a small-diameter filling chute 5 on the bag B filling side is provided at a lower portion so that the inclined inner peripheral surface is located at the lower part. adhesion preventing device for granule-body automatic weighing machine, characterized by being configured respectively attached to upper and lower portions of the inclined surface and below the supporting metal 7,8 over a slight tension of about 1 0 mm Ri by length.