JPH018486Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> The present invention involves wrapping a packaging film around a cylindrical body for bag making, forming a bag body, which hangs down, and connecting a screw shaft and an outer tube disposed inside the cylindrical body. The present invention relates to a discharge port structure in a bag-forming-filling-packaging device for powdered materials that transports and fills powdered materials into bags using a screw conveyor.

<Prior Art> Conventionally, this type of discharge port structure has fan-shaped discharge holes 11, 11, . . . at the downstream end of a cylindrical body 10, as shown in FIG.
A cap with a circumferential hole was provided at the tip of the outer tube of the screw conveyor.

<Problem to be solved by the invention> However, with such a conventional discharge port structure, when powder is conveyed from the ring-shaped conveyance path of the screw conveyor to the cylindrical body 10, the conveyance path is interrupted. The area suddenly increases by the cross-sectional area of the center axis of the screw shaft, and the powder material is supplied to the bag from the discharge holes 11 in a state where the density is significantly reduced and a large amount of air is contained.

Therefore, the powder is filled while scattering inside the bag, and it tends to adhere to the inner surface of the bag, and especially if it adheres to the sealing part, it will get caught during sealing, resulting in an incomplete seal and causing the density inside the bag to become coarse. Because it contains a large amount of air, sufficient air cannot be removed.
Moreover, immediately after the rotation of the screw conveyor is stopped, an undetermined amount falls from the partition between the discharge holes 11, resulting in a problem that the contents of the bags vary.

In view of these conventional circumstances, the present invention prevents the powder from scattering and prevents the powder from breaking immediately after the screw conveyor stops, by reducing the air in the powder and increasing its density before filling the bag. The purpose is to prevent an indefinite amount of powdery material from falling.

<Means for Solving the Problems> The technical means taken by the present invention to solve the above problems is to provide a tapered cylindrical shape at the discharge end of the screw shaft, the outer peripheral surface of which gradually becomes smaller in diameter as it goes toward the end. A tip member formed in the shape of It is characterized by having a bridge-forming flange that projects in an annular shape with a gentle downward slope inward.

<Operation> According to the above-mentioned technical means, the present invention supplies the powdery material from the screw conveyor between the outer peripheral surface of the tip member and the inner peripheral surface of the mouthpiece, thereby gradually reducing the conveyance area of the powdery material. By doing so, the powder is gradually compressed into a lump and filled into the bag body, and when the screw conveyor is stopped, the opening area of the tip opening is narrowed at the flange, thereby reducing the amount of powder above the flange. A bridge is formed on the rim, and the bridge is reliably supported by the flange.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

In the figure, reference numeral 4 denotes a cylindrical body for bag making, which is wrapped with a packaging film B and sealed with a vertical seal 8 to form a cylindrical shape and hang down.

Conveyors 9 are provided on both sides of the bag-making cylinder 4, respectively.
9 is arranged so as to be able to freely approach and separate, and the packaging film B is fed by a predetermined length.

A screw conveyor 7 consisting of a screw shaft 5 and an outer tube 6 is inserted concentrically into the bag-making cylinder 4, and the tip member 3 is attached to the lower end of the screw shaft 5, and the base is attached to the lower end of the outer tube 6. 1 respectively.

The function of the tip member 3 will be described next.

The powdery material is conveyed through a conveyance path with a ring-shaped cross section of the screw conveyor 7.
When the powder is transported further downward, the cross-sectional area of the transport path suddenly becomes wider by the cross-section of the center axis of the screw shaft 5, which causes a significant decrease in density and causes poor powder breakage.

Although the tip member 3 in this embodiment is formed into a tapered truncated cone shape to moderate the change in the cross-sectional area, it may also be in the shape of a cone or a bullet.

Next, the cap 1 will be described.

The mouthpiece 1 is formed into a tapered cylindrical shape with an inner circumferential surface that gradually becomes smaller in diameter as it approaches the tip opening, and the tip opening has a flange 2 that protrudes in an annular shape with a gentle downward slope inward. Form.

In the nozzle 1, the cross-sectional area of the conveyance path through which the powder is conveyed gradually decreases, so the density of the powder gradually increases, the amount of air contained can be significantly reduced, and scattering of the powder can be prevented. .

Furthermore, the concave bridge shown in C in FIG. 2, which is formed when the screw conveyor 7 is stopped, is reliably formed. Since the formed bridge C is reliably supported by the flange portion 2, it is extremely easy to break off powder.

Further, the lower end of the bag-making cylinder 4 is surrounded by a blow-up prevention device 12 in a cylindrical shape, and the elastic body B expands to press the opening of the bag body A ₁ against the lower end of the bag-making cylinder 4. Prevent powder from adhering to the seal part of bag body _A2 due to powder blowing up.

Further _, below the blow-up prevention device 12, a sealing device 14 having a built-in cutter 15 is disposed so as to be able to be opened and closed back and _forth . Separate bag A ₁ from bag A ₂ at .

In the above embodiment, the operation of filling powder into the bag _A2 is carried out by rotating the screw conveyor 7 by a predetermined angle.

When the screw conveyor 7 is stopped, the compressed powder material forms a stable bridge C at the collar 2 at the base 1, so that the contents of the bag become uniform during repeated filling operations.

<Effects of the Invention> Since the present invention has the above configuration, it has the following advantages.

Powder is supplied from the screw conveyor between the outer peripheral surface of the tip member and the inner peripheral surface of the mouthpiece, and the conveying area of the powder is gradually reduced, thereby gradually compressing the powder into a lump. When the screw conveyor is stopped, a bridge is formed on the flange by narrowing the opening area of the tip opening at the flange.
Since the bridge is reliably supported by the flange, it is possible to prevent powder from scattering, preventing powder from adhering to the inner surface of the bag, and making it easier to cut powder immediately after the screw conveyor stops. This can prevent an indefinite amount of powder from falling.

Therefore, the seal is perfect, air can be removed extremely easily, and variations in the internal capacity of the bag can be eliminated.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of a bag-filling-packaging device for powdered materials using the discharge port structure of the present invention, Fig. 2 is an enlarged side sectional view of the main part, and Fig. 3 is a view of the discharge port. FIG. 4 is a perspective view of a conventional example of a discharge port. In the figure, 1...cap, 2...flange, 3...tip member, 4...cylindrical body for bag making, 5...screw shaft, 6...outer tube, 7...screw conveyor,
A ₁ , A ₂ ... Bag body, B ... Packaging film, C ...
It's Bridge.

Claims (1)

[Scope of utility model registration request] A packaging film is wrapped around a cylindrical body for bag making to form a bag, which hangs down, and a screw conveyor consisting of a screw shaft and an outer tube disposed inside the cylindrical body transports and fills the powder into the bag. In a bag-forming-filling-packaging device for powdered materials, a tip member formed in a tapered cylindrical shape whose outer peripheral surface gradually becomes smaller in diameter as it goes toward the tip side is provided at the tip of the discharge side of the screw shaft, and the tip member is formed in a tapered cylindrical shape whose outer circumferential surface becomes gradually smaller in diameter toward the tip side. A cap formed in a tapered cylindrical shape is provided at the side tip, and the inner peripheral surface thereof gradually becomes smaller in diameter toward the tip, and the tip opening of the cap protrudes in an annular shape with a gentle downward slope inward. A discharge port structure characterized by forming a flange portion for forming a bridge.