JP6945449B2 - Pulper and Pulper rotor blade structure - Google Patents

Description

The present invention relates to a blade structure of a pulper and a pulper rotor, and more particularly to an economical replacement blade technique excellent in wear resistance and replacement workability.

To make used paper such as cardboard, magazines, and newspaper into recycled paper, first, the used paper is finely disintegrated into a slurry. At this time, a pulper device is used, which usually has a basic configuration including a storage tank for charging used paper and water, and a rotor rotatably provided at the bottom of the storage tank. In addition, the rotor is equipped with blades that extend in the radial direction in order to improve the efficiency of disassembly, and the rotation of the blades disassembles the used paper.

Here, stainless steel is used for the rotor, but a replacement blade is used because the tip of the blade blade is gradually worn by a strong shearing force or frictional force. FIG. 5 is a cross-sectional view of a conventional replacement blade. FIG. 5A shows a type in which a replacement blade is attached to the front in the rotation direction of the blade blade. FIG. 5B shows a replacement blade type that has a two-blade configuration and the lower blade can also be replaced. The lower blade is bolted to the upper blade, and the upper blade is bolted to the substrate to bond the whole.

There is a strainer under the rotor, and the waste paper is efficiently separated between the strainer and the rotor, so that the lower corner portion of the blade blade wears faster than the upper corner portion. Therefore, as shown in FIG. 5B, a harder material is used on the lower side as a two-sheet structure to improve the wear resistance as a whole.

However, the conventional technique has the following problems.
The type shown in FIG. 5A has a problem that it is not economical because the upper corner needs to be replaced as a whole even though the replacement time has not yet arrived due to the wear of the lower corner. .. In order to solve this, a one-piece replacement blade is also used, in which a high-hardness material (for example, stellite) is welded to the lower corner, polished and molded, but after all, the labor of processing and the cost of special materials are used. There was a problem that it was not economical considering the above.

Further, if the bolt for fastening the spare blade is arranged on the front side in the rotation direction of the rotor, there is a problem that the bolt itself may be worn and cannot be removed. Further, since the bolt is screwed parallel to the bottom surface of the storage tank, it is difficult to fit the tool and manual work is required, which causes a problem that the replacement workability is significantly impaired.

JP-A-2009-287131 JP 2013-47407

The present invention has been made in view of the above, and an object of the present invention is to provide an economical replacement blade structure having excellent wear resistance and replacement workability.
Another object of the present invention is to provide a pulper adopting the structure.

The rotor blade according to claim 1 is a pulper including a storage tank for charging paper and water, a strainer provided at the bottom of the storage tank, and a substantially disk-shaped rotor that rotates on the strainer. , A blade part that is arranged symmetrically while extending in the radial direction of the rotor and separates the paper from the strainer by the rotation of the rotor. A homogeneous material that has a hardness greater than the hardness of the L-shaped blade located on the upper surface side of the rotor and the L-shaped blade located on the bottom surface side of the rotor, which is obtained by dividing the substantially U-shaped recesses to be fitted in half along the length. The front surface of the recess in the rotation direction is a front slanted slope so as to guide the used paper or slurry to the strainer side, and the L-shaped blade and the plate blade are the base portions. It is characterized in that it can be attached to and detached from the base portion by a bolt screwed from the upper surface side of the rotor through a hole penetrating the convex portion of the rotor.

That is, in the invention according to claim 1, the blade is separated into an L-shaped blade and a plate blade in consideration of the wear rate of the upper and lower corners, and the blade can be replaced at each replacement timing. A material that requires more wear resistance and generally has a high unit price can be cut into a plate shape that is easy to process and has a small volume and can be used (compared to FIG. 5B). The amount of is small). As a result, the wear resistance of the entire blade portion is improved, and the life of the blade can be extended. In addition, the power tool can be applied from the upper surface side of the rotor, and the replacement workability is excellent.
In addition, it is not necessary to weld a high-hardness material, which has been conventionally performed, to make the wear resistance of the upper and lower corners substantially the same, and only by processing a uniform and homogeneous material, the right material is in the right place. It can be used as a spare blade.

The rotor blade portion according to claim 2 has a material having a hardness higher than that of the base portion attached to the bottom surface of the base portion at a position continuous with the rear side in the rotation direction of the plate blade in the blade portion according to claim 1. It is characterized by.

That is, the invention according to claim 2 can further improve the wear resistance of the entire rotor bottom surface, which is easily worn with the strainer.

In addition, "wearing" may be an exchangeable mode or a welded mode. Although this material is not particularly limited, a material that exceeds the hardness of the base portion and has a hardness equivalent to that of the L-shaped blade can be adopted.

The pulper according to claim 3 is a pulper having the rotor blade portion according to claim 1 or 2.

That is, the invention according to claim 3 can provide a pulper having excellent wear resistance and excellent rotor blade replacement workability.

According to the present invention, it is possible to provide an economical replacement blade structure having excellent wear resistance and replacement workability.
Further, it is possible to provide a pulper adopting the structure.

It is a schematic block diagram of the pulper which has the rotor blade part (blade blade) of this invention. It is a partial cross-sectional view. It is an enlarged view of the bottom part of a pulper. (A) is a plan view, and (b) is a schematic cross-sectional view. It is a perspective view of the blade blade part. The dents are partially seen through. It is sectional drawing of a blade blade and a strainer. It is sectional drawing of the conventional blade blade. (A) is a cross-sectional view of one spare blade type, (b) is a cross-sectional view of two spare blade types, and (c) is a plan view of a rotor equipped with the spare blade type of (b). Yes (the strainer is also displayed).

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a pulper having a rotor blade portion of the present invention. FIG. 2 is an enlarged view of the bottom portion of the pulper. FIG. 3 is a perspective view of the blade blade portion. FIG. 4 is a cross-sectional view of the blade blade and the strainer. For convenience of explanation, the scale of each figure is not necessarily the same.
The pulper 1 includes a storage tank 2, a strainer 3 provided at the bottom of the storage tank 2, and a rotor 4 that rotates on the strainer 3.

The storage tank 2 is composed of a cylindrical portion 21, a truncated cone portion 22 facing the rotor 4, and an upper lid 23. The upper lid 23 is provided with an input port 231 for inserting used paper or the like. Further, although not shown, a water supply pipe is joined to the cylindrical portion 21.

Due to the slope of the truncated cone 22, the mixture of water and recycled paper collects in the rotor 4 and efficient shearing is achieved. In other words, rapid slurrying of the mixture is achieved.

The strainer 3 is a plate-shaped member having a large number of holes 31 and having a predetermined thickness, and the waste paper is sheared by the holes 31 and the blades 5 of the rotor 4 described later. Stainless steel having a predetermined hardness is used for the strainer 3. An openable / closable discharge port (not shown) is provided directly below the strainer 3 to discharge the slurry in an appropriate state.

The rotor 4 has a substantially disk shape, and has a rotor main body 41 and a rotor cap 42 that is attached to the upper part of the rotor main body 41 and rotates integrally with the rotor main body 41. In the present embodiment, the rotor body 41 and the rotor cap 42 are both made of stainless steel having a predetermined hardness or strength.

The rotor body 41 is provided with eight blades 5 arranged symmetrically with respect to the rotation axis in the radial direction. The blade blade 5 is configured by covering the base portion 51 with a substantially U-shaped recess 52.

The base portion 51 is an extended portion of the rotor main body 41, and the front side of the rotor 4 in the rotation direction is formed in a convex shape. The dent 52 has a shape that fits into the ridge, and is divided into two along the length, an L-shaped blade 521 located on the upper surface side of the rotor 4 and a plate blade located on the bottom surface side of the rotor 4 (strainer 3 side). It is formed by the body 522 and.

As shown in FIG. 4, the L-shaped blade body 521 and the plate blade body 522 are subjected to the base by tightening the bolt B from the upper surface side of the rotor 4 through the holes 511 penetrating the upper and lower sides of the ridges lying sideways. It is attached to the portion 51 (the concave line 52 is in a state of covering the convex line).

The plate blade body 522 is a substantially rectangular plate material having a predetermined thickness, and a specific high-hardness stainless steel is used. Further, the L-shaped blade 521 is a columnar body having an L-shaped cross section, and stainless steel having a predetermined high hardness is used.

As is clear from the shape of the recess 52, the upper corner 521C belonging to the L-shaped blade 521 and the lower corner 522C belonging to the plate blade 522 form a blade, and the used paper is sheared by the rotation of the rotor 4. go. Further, in the recess 52, the surface S on the front side in the rotation direction forms a front slope, so that the used paper or the slurry is guided to the strainer 3 side, and the shearing efficiency is improved.

Here, the corners 521C and 522C are gradually worn by use. In particular, for the corner 522C, since the strainer 3 exists directly underneath, the resistance becomes large and the wear speed is fast (if the same material is used, the corner 522C wears three times as fast as the wear speed of the corner 521C. To go). Therefore, in the blade blade 5, the L-shaped blade 521 uses a material having a hardness higher than that of the base portion 51, and the plate blade 522 uses a material having a hardness higher than that of the L-shaped blade 521. As a result, the life of the square 522C can be extended, and maintainability is improved.

Further, if the hardness becomes high, it becomes difficult to process, but it can be said that the plate blade 522 is excellent in processability because it has a plate shape.
Further, although a material having a high hardness generally has a high unit price, the volume of the plate blade 522 is smaller than that of the L-shaped blade 521, and the running cost is also reduced. Compared with the conventional two-flute configuration shown in FIG. 5 (b), the volume of the plate blade 522 is 1/2 to 1/3 of that of the replacement blade on the lower side of the figure, which is economical.

Further, since the bolt B is screwed from above in the vertical direction, unlike the case where the bolt B is screwed horizontally from the front side in the rotation direction, the recess 52 can be easily joined to the base portion 51 by using an electric tool. Since it can be attached and detached, it is extremely easy to replace. The number of bolts B can also be halved from the two-flute specification shown in FIG. 5 (b) (see FIG. 5 (c)).

Since the bottom surface side (strainer 3 side) of the base portion 51 connected to the plate blade body 522 also wears due to resistance, a reinforcing plate 53 is welded to the bottom surface of the blade blade 5. The reinforcing plate 53 uses the same material as the L-shaped blade 521. This further improves the life of the rotor 4.

Next, the rotor cap 42 will be described.
The rotor cap 42 is formed by a substantially conical cap base 421 that rises in a mountain shape, and a plurality of stirring protrusions 422 that are radially provided so as to form convex stripes that draw an arc on the upper surface of the cap base 421. NS. The cap base 421 and the stirring convex 422 are integrated.

On the upper surface of the blade blade 5, a ridge forming a smooth arc continuous with the stirring convex 422 is formed as the stirring blade 512. The stirring blade 512 is away from the center of rotation and has a high speed to shear the used paper here as well. Since the stirring blade 512 is also replaceable because it is worn by resistance like the recess 52. That is, the bolt B allows the bolt B to be attached and detached from above vertically with an electric tool.

When operating the rotor 4, first, with the discharge port of the storage tank 2 closed, used paper is thrown in from the charging port 231 to fill water, and then the rotor 4 is rotated. The rotation of the rotor 4 creates a water flow that circulates in the storage tank 2, and the blades 5 sequentially reduce the size of the recycled paper. After that, the discharge port is opened and the pulp-containing liquid (slurry) is taken out.

As described above, the pulper 1 is a pulper that employs an economical replacement blade structure having excellent wear resistance and replacement workability.

The present invention is not limited to the above aspects. For example, the number of blades 5 is not eight, but may be six or ten. The rotor cap 42 is not limited to a mountain shape, and may have a bowl-shaped swelling shape.
The reinforcing plate 53 portion may also be replaceable.

This rotor structure can be used in the field of stirring dissolution or stirring shearing.

1 Pulper 2 Storage tank 21 Cylindrical part 22 Cut conical part 23 Top lid 231 Input port 3 Strainer 31 Hole 4 Rotor 41 Rotor body 42 Rotor cap 421 Cap base 422 Stirring convex 5 Blade blade 51 Base part 511 Hole 512 Stirring blade 52 Concave 521 L-shaped blade 521C Upper angle on L-shaped blade 522 Plate blade 522C Lower corner on plate blade 53 Reinforcing plate B Bolt S Front surface in rotation direction

Claims (3)

In a pulper provided with a storage tank for charging paper and water, a strainer provided at the bottom of the storage tank, and a substantially disk-shaped rotor that rotates on the strainer, it is rotationally symmetric while extending in the radial direction of the rotor. It is a blade part that separates the paper from the strainer by the rotation of the rotor.
A base part with a convex shape on the front side in the direction of rotation,
The hardness is greater than the hardness of the L-shaped blade located on the upper surface side of the rotor and the L-shaped blade located on the bottom surface side of the rotor, which is obtained by dividing a substantially U-shaped recess that fits into the base portion in half along the length. A plate blade made of a homogeneous material and
Formed by
The front surface of the dent in the rotation direction is a front slope so as to guide the used paper or slurry to the strainer side.
The L-shaped blade and the plate blade are characterized in that they can be attached to and detached from the base portion by a bolt screwed from the upper surface side of the rotor through a hole penetrating the convex portion of the base portion. Rotor blade part to do. The rotor blade portion according to claim 1, wherein a material having a hardness higher than that of the base portion is attached to the bottom surface of the base portion at a position continuous with the rear side in the rotation direction of the plate blade. A pulper having a rotor blade according to claim 1 or 2.

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