JPH07126995A - Dry old paper defibrating device - Google Patents

Abstract

PURPOSE:To provide a dry old paper defibrating device for reducing the amount of non-defibrated material produced by defibrating raw material old paper in high defibration ratio. CONSTITUTION:In a cylindrical casing 11 equipped with a denture mold showing a cross-sectional wavy shape along the peripheral direction in the inner peripheral face, a centrifugal impeller 12 is concentrically arranged with a gap space from the casing. By revolving the centrifugal impeller, previously finely cut raw material old paper is sucked together with an air flow, passed through a gap space between the denture mold of the cylindrical casing and the centrifugal impeller and defibrated into a fibrous state, the centrifugal impeller 12 has a scirocco fan type impeller structure radiately provided with a great number of vanes 121 with a size short in the radial direction and long in the axial direction and the number of the vanes can be increased without disturbing suction of raw material old paper caused by narrowed gaps between the vanes at the suction inlet of the impeller.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry waste paper disintegration device for disintegrating finely cut raw waste paper into a fibrous state by a dry method, and particularly plays an important role in disintegrating raw waste paper. The present invention relates to improvement of a centrifugal impeller.

[0002]

2. Description of the Related Art FIG. 3 is an explanatory view of a basic structure of a conventional dry waste paper disintegrating apparatus, and FIG. 4 is a side view of one blade portion of the centrifugal impeller shown in FIG. As shown in FIGS. 3 and 4, the conventional dry waste paper disintegration device includes a short cylindrical casing 51 in which an inner peripheral surface is provided with a tooth mold 511 having a corrugated cross section along the circumferential direction, In the example, this cylindrical casing 51 is provided with a tooth mold 511 having a wavy shape with a triangular cross section and having a mountain portion 511a and a valley portion 511b provided on the inner peripheral surface.
Concentric shape (coaxial core shape) with a gap space inside this
And a centrifugal impeller 52 disposed in the. In addition,
The defibrated material obtained by the dry waste paper defibrating device is used as a raw material for recycled paper, or used as a raw material for manufacturing by replacing a construction form with a plywood board, for example.

A centrifugal impeller 52 in a conventional dry waste paper disintegration apparatus has a plurality of impellers 521 each having a length in the radial direction and a length in the axial direction, which are attached to a main plate 522 and side plates (shroud plates) 523 on both sides. It will be. Generally, the number of blades is about 10 to 20. Each of these blades 52
1 is a blade having a rearward-facing blade shape, and has a lead portion 52 at its tip facing the tooth profile 511 of the cylindrical casing 51.
1a is attached to the main plate 522 and the side plate 523 in a state of protruding by a predetermined dimension from the main plate 522 and the side plate 523. As a typical dimension of the centrifugal impeller 52, the diameter (the diameter of the main plate 522) is 340 mm and the number of blades is 10.
The radial dimension of the blade and the blade in the side view is 100 mm, the axial dimension of the blade is 22 mm, and the impeller rotation speed is 85H.
z (5100 r / min). In addition, a lid (not shown) having a raw material waste paper suction port is attached to the surface of the cylindrical casing 51 on the front side in FIG. A spiral casing (not shown) having a discharge port and a spiral flow passage formed therein is attached.

In the dry waste paper disintegration apparatus constructed as described above, by rotating the centrifugal impeller 52,
Pre-cut raw waste paper (for example, width 3 mm, length 1
(A rectangular shape of about 2 mm) is sucked together with the airflow from the raw waste paper suction port, and the side plate 523 and the main plate 5 from the central empty portion of the side plate 523 which is the impeller suction port.
It is led between 22 and. Next, the used waste paper is transported in the radial direction of the impeller by the centrifugal force generated by the rotation of the centrifugal impeller 52, and is guided to the space between the toothed mold 511 of the cylindrical casing 51 and the centrifugal impeller 52. Then, the used waste paper is gradually disentangled into fibers in a gap space between the tooth mold 511 and the centrifugal impeller 52 while being orbiting in the casing circumferential direction, and is gradually disintegrated into fibers to give a cotton-like disentanglement. This cotton-like defibrated material is transported into the spiral casing by the velocity component of the airflow generated by the rotation of the centrifugal impeller 52 in the casing axial direction (impeller axial direction), and It will be sent from the outlet to the cyclone (not shown) together with the air flow.

Next, the defibration principle of the dry used paper defibrating apparatus will be described with reference to FIGS. 5 to 7, I is a centrifugal impeller, V is a blade of the centrifugal impeller I, V1 is a blade lead portion, C is a cylindrical casing, K is a tooth profile of the cylindrical casing C, and K1 is Tooth shape mountain part,
K2 indicates a tooth-shaped valley portion, and M indicates a raw material waste paper. The following action mechanism is mainly considered as the defibration principle. Disentanglement due to the collision of the used waste paper with the tooth-shaped mountain portion (see FIG. 5) In the clearance space between the centrifugal impeller I and the tooth type K of the cylindrical casing C, the rotation of the centrifugal impeller I causes the casing circle to rotate. An airflow having a velocity component in the circumferential direction, a velocity component in the casing radial direction (impeller radial direction), and a velocity component in the casing axial direction (impeller axial direction) is generated. The raw waste paper M, which is transported in the radial direction of the impeller from the impeller suction port by the centrifugal force generated by the rotation of the centrifugal impeller I and is introduced into the gap space between the tooth model K and the centrifugal impeller I, is Being pressed against the tooth profile mountain K1 by the velocity component in the casing radial direction, and further, non-periodically colliding with the tooth profile mountain region K1 while making a circular motion by the velocity component in the casing circumferential direction of the air flow, It is presumed that the fibers will be defibrated by being cut and loosened.

Disentanglement due to inelastic collision between the blade reed portion and the used waste paper (see FIG. 6) The moving speed of the used waste paper M in the circumferential direction of the casing is determined by the tooth type while the used waste paper M makes a circular motion. Since it is subjected to the cutting action due to the collision with the mountain portion K1, it is much slower than the peripheral speed of the blade lead portion V1. As a result, the blade lead portion V1 of the centrifugal impeller I collides with the used raw paper M on the same orbit, and the raw material waste paper M is loosened by the inelastic collision between the blade lead portion V1 and the used raw paper M. It is estimated that it will be disentangled.

Disintegration by shearing of the used waste paper sandwiched between the tooth crests and the blade leads (see FIG. 7) Between the tooth crests K1 and the blade leads V1 during the orbiting motion It is presumed that the raw material waste paper M sandwiched between the two will be defibrated by being sheared by the tooth-shaped mountain portion K1 and the impeller lead portion V1.

[0008]

However, in the above-mentioned conventional dry type waste paper disintegration apparatus, since a relatively large amount of undisintegrated matter is generated, it is necessary to increase the disintegration rate. In addition, the undisentangled material, despite being supplied to the dry waste paper disintegration device
It does not become fibrous like cotton and is in the state of the original waste paper, on the other hand, defibrated material is a fibrous like cotton made by a dry waste paper disintegration device. That is. Further, the defibration rate is expressed as a percentage of the weight of the obtained defibrated material with respect to the weight of the supplied raw waste paper.

Therefore, the following findings were obtained from the experiments conducted by the present inventors regarding the improvement of the defibration rate. (A) FIG. 8 is a graph showing an example of the relationship between the number of blades and the defibration rate in a dry waste paper defibration device having a conventional centrifugal impeller. As can be seen from this graph, as the number of impeller blades increases, the amount of undefibrated material generated decreases and the defibration rate increases. (B) FIG. 9 is a graph showing an example of the relationship between the axial width dimension of the blade and the defibration rate in the dry waste paper defibration device having the conventional centrifugal impeller. As can be seen from this graph, the longer the axial width of the blade, the smaller the amount of undisentangled material generated and the higher the disentanglement rate. (C) FIG. 10 is a graph showing an example of the relationship between the velocity ratio in the casing circumferential direction and the defibration rate in the dry waste paper defibration device having the conventional centrifugal impeller. Here, the velocity ratio in the casing circumferential direction is represented by the ratio of the velocity of the air flow in the casing circumferential direction to the circumferential velocity of the impeller. As can be seen from this graph, the higher the velocity of the air flow due to the rotation of the impeller in the casing circumferential direction, the smaller the amount of undefibrated material generated and the higher the defibration rate.

The present invention was made on the basis of the above findings, and is a dry type waste paper disintegration capable of disintegrating raw waste paper with a high disintegration rate by reducing the amount of undisintegrated matter generated. The purpose is to provide a device.

[0011]

In order to achieve the above-mentioned object, a dry waste paper disintegration apparatus according to the present invention is a cylindrical type in which an inner peripheral surface is provided with a tooth pattern having a wavy cross section along the circumferential direction. It has a casing and a centrifugal impeller that is concentrically arranged inside the cylindrical casing with a clearance space between the casing and the casing. In a dry waste paper disintegrating device that is sucked together with a flow to pass through a gap space between the tooth profile of the cylindrical casing and the centrifugal impeller to disintegrate into a fibrous shape, the centrifugal impeller is radial. It is characterized by having a sirocco fan type impeller structure having a large number of blades that are short and long in the axial direction in a radial pattern.

[0012]

According to the dry waste paper disintegration apparatus of the present invention, the centrifugal impeller has the structure of a sirocco fan type impeller, and the outer diameter of the impeller is the same as that of the conventional centrifugal impeller. However, the number of blades can be increased without impairing the suction of raw waste paper due to the narrow spacing between the blades at the impeller inlet.
More often, defibration is performed due to inelastic collision between the blade lead portion and the raw waste paper, and the raw waste paper sandwiched between these by the tooth-shaped crest portion of the cylindrical casing and the blade lead portion. By increasing the number of defibration by shearing, the amount of undefibrated material is reduced,
The defibration rate can be increased. Further, since the axial width dimension of the blade is longer than that of the conventional one, the staying time of the used waste paper in the space between the tooth mold and the impeller becomes longer. More often, the defibration is performed by the inelastic collision of the material, and the defibration is performed by the shearing of the used waste paper sandwiched between the tooth crests and the blade reeds. By reducing the amount of undefibrated material generated,
The defibration rate can be increased. Furthermore, since it is a front-facing blade, even if the peripheral speed of the impeller is the same as that of the conventional centrifugal impeller, the speed of the air flow at the blade outlet due to the rotation of the impeller becomes faster in the casing circumferential direction. By increasing the collision energy of the used waste paper to the tooth crests,
It is possible to increase the defibration rate by reducing the amount of undefibrated material generated.

[0013]

1 is a partial cross-sectional side view of a dry waste paper disintegration apparatus according to an embodiment of the present invention, and FIG. 2 is a front view for explaining the structure of a cylindrical casing and a centrifugal impeller shown in FIG. Is. In FIGS. 1 and 2, 11 is a cylindrical casing, and 12 is a centrifugal sirocco fan type impeller (hereinafter, simply referred to as a sirocco fan type impeller). The cylindrical casing 11 has a cylindrical shape, and is provided on its inner peripheral surface with a tooth mold 111 having a peak portion 111a and a valley portion 111b in a corrugated shape having an isosceles triangular cross section along the circumferential direction.

The sirocco fan type impeller 12 has a large number of blades 121 which are short in the radial direction and long in the axial direction (the width direction of the tooth form 111), and have a plurality of main plates 122 on both sides radially and in the forward direction with respect to the rotational direction. And a side plate (shroud plate) 123, and a circular main plate 122 is fixed to the hub 124 by riveting or the like. In addition,
The central hollow portion of the circular donut-shaped side plate 123 serves as an impeller suction port. The number of blades of the sirocco fan type impeller 12 is about three times that of the centrifugal impeller of the conventional dry waste paper disintegration apparatus described above, and is generally about 32 to 64. Each blade 121 whose blade shape is a forward blade
The lead portion 121a at the tip of the cylindrical casing 11 facing the tooth mold 111 faces the main plate 122 and the side plate 123.
The main plate 122 and the side plate 12 in a state of protruding by a predetermined dimension
It is attached to 3. Sirocco fan type impeller 12
As a typical dimension of the blade, the diameter (the diameter of the main plate 122) is 340 mm, the number of blades is 32, the radial dimension of the blade in the side view is 30 mm, the axial dimension of the blade is 88 mm, and the impeller rotation speed is Is 85 Hz (5100 r / min). This sirocco fan type impeller 12 is housed in the cylindrical casing 11 concentrically (coaxial core) with a clearance space inside it, and its hub 124 is integrated with the drive shaft 13 with it. It is fixed via a rotating impeller holder cylinder 14 and is rotated by a rotation driving motor 15.

On the surface of the cylindrical casing 11 on the side of the impeller suction port, a lid 16 having a raw material waste paper suction port 16a is fixed by bolting,
A spiral casing 17 in which a discharge port 17a is provided at one end and a spiral flow path is formed inside is formed on the surface of the cylindrical casing 11 opposite to the surface on which the lid 16 is attached.
Are fixed with bolts.

According to the dry waste paper disintegration device equipped with the sirocco fan type impeller 12 having such a sirocco fan type impeller structure, even when the outer diameter of the impeller is the same as that of the conventional centrifugal impeller. Since the interval between the blades at the impeller suction port is narrowed and the suction of the used waste paper is not hindered, the number of blades can be increased.
21a is more likely to be defibrated by inelastic collision between the used waste paper and the cylindrical casing 11
The tooth-shaped mountain portion 111a and the blade lead portion 121a cause more defibration due to shearing of the used raw paper sandwiched therebetween, thereby reducing the amount of undefibrated material, The defibration rate can be increased. Further, since the axial width dimension of the blade 121 is longer than that of the conventional blade 121, the retention time of the used waste paper in the space between the tooth mold 111 and the impeller 12 becomes long. More frequently, defibration is performed due to inelastic collision between waste paper and raw waste paper, and the tooth crest 1
Since the defibration due to the shearing of the used waste paper sandwiched between these by 11a and the blade lead portion 121a is more frequently performed, the amount of undefibrated material is reduced and the defibration rate is increased. be able to. Further, since the blade is a front-facing blade, even when the peripheral speed of the impeller is the same as that of a conventional centrifugal impeller, the air flow at the blade outlet portion due to the rotation of the sirocco fan type impeller 12 in the casing circumferential direction By increasing the speed and increasing the collision energy of the used waste paper on the tooth-shaped crests 111a, it is possible to reduce the generation amount of undisentangled substances and increase the defibration rate.

[0017]

As described above, according to the dry waste paper disintegration apparatus of the present invention, the centrifugal impeller for disintegrating raw waste paper into fibrous material has the structure of a sirocco fan type impeller. Even when the outer diameter of the impeller is the same as that of the conventional centrifugal impeller, the number of blades is increased without impairing the suction of the used waste paper due to the narrow gap between the blades at the impeller inlet. Since the blade reed is more likely to be defibrated due to the inelastic collision between the blade reed portion and the used waste paper, and the tooth-shaped crest portion and the blade reed portion of the cylindrical casing The defibration of the raw waste paper sandwiched between them is more often performed by shearing, so that the amount of undefibrated material generated can be reduced and the defibration rate of the raw waste paper can be increased.

[Brief description of drawings]

FIG. 1 is a side view showing a partial cross section of a dry waste paper disintegration apparatus according to an embodiment of the present invention.

FIG. 2 is a front view for explaining the structure of the cylindrical casing and the centrifugal impeller shown in FIG.

FIG. 3 is a diagram illustrating the basic structure of a conventional dry waste paper disintegration device.

FIG. 4 is a side view of one blade portion of the centrifugal impeller shown in FIG.

FIG. 5 is a diagram for explaining a state of defibration due to collision of used raw paper with a tooth-shaped mountain portion.

FIG. 6 is a diagram for explaining a state of defibration due to an inelastic collision between the blade lead portion and the used waste paper.

FIG. 7 is a diagram for explaining a state of defibration by shearing of a used waste paper sandwiched between a tooth-shaped mountain portion and a blade lead portion, which is performed between them.

FIG. 8 is a graph showing an example of a relationship between the number of blades and a defibration rate in a dry waste paper defibration device having a conventional centrifugal impeller.

FIG. 9 is a graph showing an example of a relationship between a blade axial direction width dimension and a defibration rate in a dry used paper defibrating device having a conventional centrifugal impeller.

FIG. 10 is a graph showing an example of the relationship between the velocity ratio in the circumferential direction of the casing and the defibration rate in the dry waste paper defibration device having the conventional centrifugal impeller.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 ... Cylindrical casing 111 ... Tooth pattern 111a ... Mountain part 111b ... Valley part 12 ... Centrifugal sirocco fan type impeller 121 ... Blade
121a ... Blade lead part 122 ... Main plate 123 ... Side plate 124 ... Hub 13 ... Drive shaft 14 ... Impeller holder cylinder 15 ... Rotation drive motor 16 ... Lid body 16a ... Material waste paper suction port 17 ... Swirl casing 17a ... Discharge port I ... Centrifugal impeller V ... Centrifugal impeller I blades V1 ... Blade lead part C ... Cylindrical casing K ... Cylindrical casing C
Tooth mold K1 ... Tooth mold peak K2 ... Tooth mold valley M ... Raw material waste paper

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Tetsuro Matsumoto 1-3-18 Wakihama-cho, Chuo-ku, Kobe-shi, Hyogo Kobe Steel Works, Ltd. Kobe Head Office

Claims (1)

[Claims] 1. A cylindrical casing in which an inner peripheral surface is provided with a tooth profile having a corrugated cross section along the circumferential direction, and a concentric arrangement is provided inside the cylindrical casing with a clearance space therebetween. The centrifugal impeller provided is provided, and by rotating the centrifugal impeller, the used waste paper is sucked together with the air flow to form a gap space between the tooth profile of the cylindrical casing and the centrifugal impeller. In a dry waste paper disintegrating device that is made to pass through to disintegrate into fibers, the centrifugal impeller has a sirocco fan impeller structure that radially has a large number of blades that are short in the radial direction and long in the axial direction. A dry waste paper disintegration device characterized in that