JP2002146692A - Screen cylinder for paper stock fine screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen cylinder for a paper stock fine screen, which is used for paper stock screening of paper pulp, capable of preventing dropping of a pulling out member by a simple constitution. SOLUTION: In this screen cylinder 2 in which a plurality of rodlike members 31 are arranged cylindrically at fixed intervals and mutual gaps of a plurality of the rodlike members 31 function as slit openings, two disk members 27 and 28 for nipping a plurality of the rodlike members 31 are installed at both the ends of a plurality of the rodlike members 31, each of the disk members 27 and 28 is provided with a wall part 102 for controlling the movement of the rodlike members 31 in the radial direction of the cylinders inward and a contact face 101 to be brought into contact with the wall part is formed at the end part of the rodlike members 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screening cylinder for a stock screening screen used for the stock selection of paper pulp.

[0002]

2. Description of the Related Art Conventionally, as a screen used for carefully selecting a stock and separating a high-quality fiber component and a foreign substance, a screen provided with one or two cylindrical screen cylinders is often used. A conventional screen cylinder having two screen cylinders is shown in FIGS. This screen has two screen cylinders (inner screen cylinder 1 and outer screen cylinder 2) having different diameters, and these two screen cylinders 1 and 2 are arranged coaxially. Further, the inner screen cylinder 1 and the outer screen cylinder 2 are disposed in a cylindrical container 17, and the container 17 and the two screen cylinders 1, 2 serve as a stirring chamber 7.
And two outlet chambers 18a and 18b, respectively. A lid 19 is provided on the upper surface of the container 17 so that the screen cylinders 1 and 2 can be operated under high pressure.

The stirring chamber 7 has inner and outer screen cylinders 1, 2
A plurality of wings 12a, 12b are arranged to face each other with a certain gap. The plurality of blades 12 a and 12 b are rotatably supported by a rotor 13, and the rotor 13 is fixed to a shaft 11. The shaft 11 is a bearing 15
And is driven by a motor (not shown) via a V-pulley 14 of the transmission means. Container 17
A seal 16 is provided between the shaft and the shaft 11, and the seal 16 seals the container 17 so that the internal stock solution does not leak. The screen cylinders 1 and 2 have a large number of round holes or slit holes.

[0004] Since the conventional stock selection screen is constructed as described above, stock having a concentration of 0.2 to 5% flows in a tangential direction from the pipe 3 through the annular flow path 4, and passes through the annular flow path 4. Is carried to the trap opening 5. On the other hand, other stocks are
While flowing down, the high-quality stock passes through the holes of the screen cylinders 1 and 2 and is collected in the outlet chambers 18a and 18b.
At the lower part of the container 17, it passes through the space 0 and flows out of the pipe 8. In addition, the rotation of the wings 12a, 12b loosens the fiber mass, separates foreign matter in the stock, prevents blockage of the screen cylinders 1, 2, and allows foreign matter that cannot pass through to the reject chamber 9 and is discharged from the pipe 10. .

FIG. 7 is an external view of the outer screen cylinder 2 having slit-shaped openings. In the outer screen cylinder 2 shown in FIG.
Are formed. The outer screen cylinder 2 is reinforced by reinforcing rings 26a and 26b, and the outer screen cylinder 2 is fixed to the container 17 (see FIGS. 14 and 15) by a flange 27.

FIG. 8 is a cross-sectional view taken along a line a--a in FIG. 7, and FIG. 9 is a vertical cross-sectional view taken along a line bb in FIG. Here is an example. FIG. 10 is a diagram showing the relationship between the groove 32 formed in the reinforcing rings 26a and 26b and the pull-out member 31 in detail, and is an enlarged view of FIG. As shown in FIG. 10, the pull-out members 3 are attached to the reinforcing rings 26a and 26b.
A groove 32 having the same shape as the cross-sectional shape of FIG. 1 is provided, and a plurality of extraction members 31 are inserted into the plurality of grooves 32, respectively. The slit openings 25 are formed between the pull-out members 31 which are disposed and held adjacent to each other. As shown in FIG. 9, the pull-out member 31 is sandwiched between the flange 27 and the stopper plate 28 in order to prevent the pull-out member 31 from coming off the reinforcing ring 26 a in the vertical direction. Nut 38
, These flanges 27 and stopper plates 28 are fastened.

[0007]

By the way, as shown in FIG. 10, a gap is formed between the pull-out member 31 and the groove 32 due to residue on the die, abrasion of the die, and processing accuracy of the groove 32. . FIG. 11 shows the reinforcing ring 26 of FIG.
FIGS. 12A and 12B show the shapes of the grooves 32 of FIGS. 11A and 11B, and FIG. 12 shows the cross-sectional shape of the pull-out member 31 of FIG.
If the minimum width of the groove 32 is “x” and the width dimension of the extraction member 31 in FIG. 12 is “y”, when x ≧ y, the extraction member 31 is vibrated by the fluid pulse pressure during the raw material processing operation. May fall from the groove 32 of the reinforcing ring.

FIG. 13 is a sectional view showing an example of fixing the pull-out member 31 and corresponds to FIG. In this example,
The reinforcing ring 26a, the flange 27, and the stopper plate 28 are fixed by a plurality of bolts 29, respectively, and the pull-out member 31 is fixed to the flange 27 and the stopper plate 28 by welding 35. The reinforcing rings 26a and 26b and the pull-out member 31 are also fixed by welding 36, and are partially welded in the circumferential direction.

However, if the heat input by welding is large, the drawing member 31 and the reinforcing rings 26a and 26b are distorted, and the gap accuracy of the slit opening 25 is deteriorated. Therefore, it is necessary to minimize the leg lengths of the welding 35 and the welding 36. is there. On the other hand, when the leg length of the welding is reduced, the welding 35 and the welding 36 may be detached by the vibration due to the fluid pulse pressure while the operation is continued.

In order to maximize the operating rate of the screen and maximize the selection efficiency, it is necessary to reliably prevent the pull-out member 31 of the main components of the screen cylinders 1 and 2 from falling off during operation. For this purpose, no extra heat must be applied to the screen cylinders 1 and 2 during manufacture, so that no distortion occurs. As described above, in the related art, when the pull-out member 31 is sandwiched between the flange 27 and the stopper plate 28 and fastened with a plurality of tie rods 37 and nuts 38, the minimum width of the groove 32 is equal to the width dimension of the pull-out member 31. Or larger, the slit opening 25 during operation
The pull-out member 31 forming the reinforcing ring 26a,
The blades 12a and 12b that are falling from the groove 32 of the 26b and are rotating.
And wings 12a and 12b and screen cylinders 1 and 2
Needless to say, there is a problem that the shaft and the bearing are also damaged, and the screen itself cannot be operated, resulting in expensive repair costs and a decrease in the operation rate.

When the extraction member 31 is fixed to the flange 27 and the stopper plate 28 by welding, respectively, the heat input during welding causes the extraction member 31 to bend and the reinforcing ring blades 26a, 26b to be distorted. There has been a problem that the accuracy of the slit opening dimension is deteriorated, and the efficiency of selective selection is reduced.
Further, the pull-out member 31 is connected to the flange 27 or the stopper plate 28.
When each is welded, heat input by welding is minimized and welding 3
Distortion can be suppressed by reducing the leg length of the weld 5 and the weld 36, and the accuracy of the slit opening size can be improved and the selection efficiency can be improved. However, since the leg length of the weld 35 and the weld 36 is small, fluid vibration during operation is reduced. Therefore, there is a problem that the welding portion is fatigued, the welding is removed, and breakage is caused.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to provide a screen cylinder for a selected stock screen which can prevent a pull-out member from falling off with a simple configuration.

[0013]

In order to achieve the above-mentioned object, a screen cylinder for a stock screening screen according to the present invention comprises a plurality of rod-like members arranged at a constant interval in a cylindrical shape. In the screen cylinder for the selected material screen, the gap of
At each end of the plurality of rod-shaped members, two disk members that sandwich the plurality of rod-shaped members are provided, and each of the disk members has a wall that regulates movement of the rod-shaped member toward the inner diameter side of the cylinder. The rod-shaped member is formed with a contact surface that is in contact with the wall at each end of the rod-shaped member.

Preferably, the wall and the corresponding contact surface are formed in parallel with the longitudinal direction of the rod-shaped member. Preferably, the wall portion is configured as a tapered wall portion formed on the disk member, and the corresponding contact surface is formed along the tapered wall portion. .

[0015]

Embodiments of the present invention will be described below with reference to the drawings. First, a first embodiment will be described. FIGS. 1 to 6 show a screen cylinder for a stock selection screen as a first embodiment of the present invention, and FIG. 1 is a schematic cross-sectional view showing the entire configuration thereof. 9, FIGS. 2 and 3 are diagrams each showing an enlarged main part thereof, and FIGS. 4 and 5 are diagrams each showing a modified example thereof. FIG. 4 corresponds to FIG. Note that, in the screen cylinder for a stock selection screen according to the present embodiment, the same reference numerals are used for the same portions as those in the conventional technology described with reference to FIGS. 7 to 15 and the description thereof is omitted.

In FIG. 1, a pull-out member (bar-shaped member) 31 is inserted into a groove 32 of the reinforcing rings 26a and 26b, as in the conventional one (see FIG. 10), and is cylindrical at a constant interval. It is arranged in. In order to suppress the vertical movement of the pulling member 31, both ends of the pulling member 31 are provided with a flange 27 and a stopper plate 28 as disc members. And the nut 38, the pull-out member 31 is connected to the flange 27 and the stopper plate 28.
And is pinched by.

As shown in FIG. 2, a cylindrical wall (wall portion) is provided on the stopper surface 34 of the flange 27 and the stopper plate 28.
101 is formed, and a flank 102 is formed at an end of the wall 101. Here, the wall 101 is formed parallel to the longitudinal direction of the pull-out member 31, that is, parallel to the rotation axes of the screen cylinders 1 and 2, and the pull-out member 31 is moved inward in the radial direction (the radial direction of the flange 27 and the stopper plate 28). It has a function to restrict movement. The flank 102 and the wall 101 are formed to be orthogonal to each other.

Further, as shown in FIG.
A contact surface (contact surface) 103 that contacts the wall 101 is formed at a portion facing the wall 101 at both ends of the device 1, and a relief 104 is formed at a portion facing the flank 102. That is, at both ends of the extraction member 31,
A notch is formed so as to match the shape of the wall 101 and the flank 102, and the contact surface 103 and the flank 104 constituting the notch abut against the wall 101 and the flank 102, respectively. The movement to the radial inside (the left side in FIG. 1) is restricted.

Since the screen cylinder for the paper material selection screen according to the first embodiment of the present invention is constructed as described above, when the screen cylinders 1 and 2 are operated, vibrations due to the fluid pulsation pressure of the raw material occur. However, since the wall 101 and the contact surface 103 are disposed to face each other, the extraction member 31
Of the pull-out member 31 from the reinforcing rings 26a, 26b is reliably prevented. Also, since there is no heat input by welding at the time of fabrication, components such as the extraction member 31 and the reinforcing rings 26a and 26b are not bent or distorted, and a highly reliable screen cylinder can be obtained.

Next, a modification of the first embodiment of the present invention will be described with reference to FIGS. 4 and 5.
As shown in FIGS. 4 and 5, a truncated cone-shaped wall (tapered wall portion) 105 is formed on the stopper surface 34, and a portion of the extraction member 31 facing the wall 105 has the shape of the wall 105. A contact surface (contact surface) 106 is formed along the contact surface. Except for this, the configuration is the same as that of the first embodiment.

Therefore, also in this modification, the radial movement of the pull-out member 31 during the operation of the screen cylinders 1 and 2 is restricted, so that the pull-out member 31 can be prevented from falling off. Next, a screen cylinder for a paper material selection screen as a second embodiment of the present invention will be described. FIG. 6 is a schematic diagram showing the entire configuration,
It is a figure corresponding to FIG. It should be noted that also in the screen cylinder for the finely selected stock screen according to the present embodiment, FIG.
The same parts as those of the conventional technique described with reference to FIG. 15 are denoted by the same reference numerals, and the description thereof is omitted.

In FIG. 6, the pull-out member 31 is similar to the conventional one (see FIG. 10) and has reinforcing rings 26a and 26a.
The groove 32b is inserted into the groove 32, and is arranged in a cylindrical shape at a constant interval. Further, similarly to the first embodiment,
A cylindrical wall (wall portion) 101 is formed on the stopper surface 34 of the flange 27 and the stop plate 28, and a flank 102 is formed at an end of the wall 101. Here wall 10
Numeral 1 is formed in parallel with the longitudinal direction of the pull-out member 31, that is, in parallel with the rotation axis of the screen cylinders 1 and 2, and regulates the movement of the pull-out member 31 inward in the radial direction (the radial direction of the flange 27 and the stopper plate 28). It has the function to do. The flank 102 and the wall 101 are formed so as to be orthogonal to each other.

Further, a contact surface (contact surface) 103 which is in contact with the wall 101 is formed at a portion facing the wall 101 near both ends of the extraction member 31, and a relief 104 is formed at a portion opposite to the flank 102. (See FIGS. 2 and 3). That is, cutouts are formed at both ends of the pull-out member 31 so as to conform to the shapes of the wall 101 and the flank 102, and the contact surfaces 1 constituting the cutouts are formed.
03 and the relief 104 are the wall 101 and the relief 10 respectively.
2, the movement of the pull-out member 31 radially inward (left side in FIG. 6) is restricted.

In the second embodiment, the pull-out member 31 and the reinforcing rings 26a, 26b are fixed by welding 36, and the reinforcing ring 26a, the flange 27, and the stopper plate 28 are fixed by bolts 29. That is, in the second embodiment, the configuration of the first embodiment is applied to the conventional technique described with reference to FIG. The screen cylinder for the stock material selection screen as the second embodiment of the present invention is configured as described above, and the wall 101 and the contact surface 103 prevent the drawing member 31 from moving inward in the radial direction. The welding of the pull-out member 31, the flange 27 and the stopper plate 28 can be omitted. For this reason, bending or distortion due to heat input during welding does not occur between the pull-out member 31 and the flange 27 and the stopper plate 28, and the accompanying deformation of the reinforcing rings 26a and 26b deteriorates the slit opening dimensional accuracy. Therefore, it is possible to prevent a decrease in the selection efficiency in the screen operation.

As described above, in the screen cylinder according to the present invention, the pull-out member can be prevented from falling off, and is not affected by the heat due to welding at the time of manufacture, so that bending and distortion of the components can be prevented. For this reason, it is possible to provide a stock selection screen that is highly reliable, improves the operation rate, and can maximize the selection efficiency. It should be noted that the present invention is not limited to the above-described embodiment, and can be implemented with various modifications without departing from the spirit of the present invention.

For example, the wall portion and the contact surface which regulate the radial movement of the rod-shaped member (pull-out member) 31 only need to have at least a contact component in the radial direction. However, the present invention is not limited to the embodiments.

[0027]

As described in detail above, according to the present invention,
Since the movement of the rod-shaped member inward in the radial direction is restricted by the wall portion formed on the disk member and the contact surface formed on the rod-shaped member, the rod-shaped member can be reliably prevented from falling off.
Further, since there is no thermal influence due to welding at the time of manufacturing, bending or distortion of the components does not occur, and a highly reliable screen cylinder can be obtained (claim 1).

Further, a simple configuration in which the wall formed on the disk member is formed parallel to the longitudinal direction of the rod-shaped member or is formed in a tapered shape, allows the rod-shaped member to move more inward in the radial direction. It can be effectively prevented (claims 2 and 3).

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing the entire configuration of a screen cylinder for a stock selection screen according to a first embodiment of the present invention, and is a view corresponding to FIG.

FIG. 2 is an enlarged schematic view illustrating a main part of a screen cylinder for a stock selection screen according to the first embodiment of the present invention.

FIG. 3 is a schematic diagram showing an enlarged main part of a screen cylinder for a stock selection screen according to the first embodiment of the present invention.

FIG. 4 is an enlarged schematic view showing a main part of a screen cylinder for a stock selection screen in a modified example of the first embodiment of the present invention.

FIG. 5 is an enlarged schematic view showing a main part of a screen cylinder for a stock selection screen in a modified example of the first embodiment of the present invention.

FIG. 6 is a schematic cross-sectional view showing an overall configuration of a screen cylinder for a stock selection screen according to a second embodiment of the present invention, and is a view corresponding to FIG.

FIG. 7 is a schematic perspective view showing a conventional screen cylinder.

FIG. 8 is a schematic view showing a conventional screen cylinder, and is a sectional view taken along a line aa in FIG. 7;

FIG. 9 is a schematic view showing a conventional screen cylinder, and is a cross-sectional view taken along the line bb of FIG. 7;

FIG. 10 is a schematic view showing a conventional screen cylinder, and is an enlarged view of FIG. 8;

FIG. 11 is a schematic view showing a conventional screen cylinder, showing a shape of a groove of a reinforcing ring.

FIG. 12 is a schematic view showing a conventional screen cylinder, showing a cross-sectional shape of a drawing member.

FIG. 13 is a schematic view showing a conventional screen cylinder, corresponding to FIG. 9;

FIG. 14 is a plan view showing a conventional screen cylinder.

FIG. 15 is a sectional view showing a conventional screen cylinder.

[Description of Signs] 1 inner screen cylinder 2 outer screen cylinder 3 pipe 4 annular flow path 5 trap port 7 stirring chamber 8 pipe 9 reject chamber 10 pipe 11 shaft 12a blade 12b blade 13 rotor 14 V pulley 15 bearing 16 seal 17 container 18a Outlet chamber 18b Outlet chamber 19 Lid 20 Leg 25 Slit opening 26a Reinforcement ring 26b Reinforcement ring 27 Flange (disc member) 28 Stop plate (disc member) 29 Bolt 31 Pull-out member (rod member) 32 Groove 34 Stopper surface 35 Weld 36 Welding 37 Tie rod 38 Nut 101 Wall (wall) 102 Relief surface 103 Contact surface (contact surface) 104 Relief 105 Wall (tapered wall) 106 Contact surface (contact surface)

Claims (3)

[Claims] 1. A screen screening cylinder for a stock selection screen, wherein a plurality of rod-shaped members are arranged in a cylindrical shape at regular intervals, and a gap between the plurality of rod-shaped members functions as a slit opening. And two disk members for sandwiching the plurality of rod members are provided, and each of the disk members is formed with a wall for restricting movement of the rod members to the radial inside of the cylinder, and A screen cylinder for a stock selection screen, wherein a contact surface that contacts the wall is formed at each end of the rod-shaped member. 2. The screen cylinder according to claim 1, wherein the wall and the corresponding contact surface are formed in parallel with the longitudinal direction of the rod-shaped member. 3. The device according to claim 1, wherein the wall portion is configured as a tapered wall portion formed on the disk member, and a corresponding contact surface is formed along the tapered wall portion. The screen cylinder according to claim 1, wherein the screen is a screen for selecting a stock material.