JP3403025B2 - Counter blade for paper machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a counter blade for a paper machine used in a twin-wire former for dewatering from both sides of a raw material (paper layer) using two wires. About. FIG. 6 shows a main part of a twin-wire former dewatering apparatus. As shown in the figure, the dewatering device is provided with upper and lower wires 1 and 2 running in the direction of the arrow, guide rollers 9a and 9b and an upper vacuum box 3 are arranged on the upper wire 1 side, and on the lower wire 2 side. , A lead suction box 7, a counter blade box 4 and a transfer suction box 8 are provided. The upstream lead suction box 7 is provided for smoothly and stably joining the two wires 1 and 2, and the downstream transfer suction box 8 is provided for separating them smoothly. ing. On the upper surface of the lead injection box 7, the tips of the plurality of blades 7a are arranged in an arc with a large radius. Similarly, also on the upper surface of the transfer suction box 8, the tips of the plurality of blades 8a are arranged in an arc with a large radius. The counter blade box 4 disposed therebetween is a box provided with an opening on the upper surface, and a guide block 10 shown in FIG. 7 is laid over the opening to discharge water accumulated in the box. A hole is provided in the bottom plate. [0003] The raw material sandwiched between the upper and lower wires 1 and 2 intercepts the upper and lower wires 1 and 2 on the curved surface of the blade 7a of the lead injection box 7, and dehydration mainly from the intercept point to the upper side starts. Upper and lower wires 1 and 2 on a curved surface
In this manner, the positions where dehydration starts can be uniformly arranged in the width direction of the box 7, so that uniform dehydration can be performed in the width direction, which ultimately contributes to uniform formation of paper. The vacuum box 3 provided above the upper wire 1 has three independent rooms, each of which has a gutter 3a. The upper blade 5 of the vacuum box 3 is arranged in an arc shape with a large radius, and the wires 1 and 2 are pressed by tension in this arc portion, and the raw material is dehydrated by the upper blade 5. The reason why the water is dewatered to the upper blade 5 side is that the fiber of the raw material has a higher density on the lower side. In the lower part of the upper vacuum box 3 on the entrance side,
A counter blade box 4 is provided, and in a portion sandwiched between the two, upper and lower wires 1 and 2 are alternately sandwiched between an upper blade 5 and a counter blade 6 provided in the counter blade box 4 as shown. Then, it travels in a small zigzag shape, and is subjected to dehydration by the respective blades 5 and 6. At this time, it is necessary to adjust the contact pressure between the wire and the blade according to the type (quality) of the paper to be made, which is conventionally performed by adjusting the counter blade 6. [0005] In the vacuum box 3, the suctioned water
a through the flow path 3b formed by the
a, and is discharged from the side through it.
The transfer suction box 8 is a device for surely transferring the formed wet paper web to the lower wire 2, and by optimizing the geometric arrangement of the transfer suction box 8 having the upper wire 1, the lower wire 2, and the curved surface. The transfer of the complete wet paper web to the lower wire 2 and the removal of the wet paper web fibers to the upper wire 1 can be minimized. Next, a conventional counter blade 6 will be described with reference to FIG. An appropriate number (usually 7 to 10) of guide blocks 10 are stretched over both side surfaces of the counter blade box 4. The front and rear side surfaces of the guide block 10 are finished in parallel, and a blade carrier 11 having a U-shaped cross section is mounted on the outer side surface thereof so as to be slidable in the vertical direction. The blade carrier 11 is formed by connecting the main body 11a and the guide plates 11b, 11b with bolts 11c. A protruding guide 11d is formed in the main body 11a of the blade carrier 11, and the dovetail groove of the blade 12 is fitted therein. The tip 12a of the blade 12 is made of a highly wear-resistant ceramic because it comes into contact with the traveling lower wire 2.
The main body 12b made of P (fiber reinforced resin) is fixed with an adhesive or the like. [0007] Guide block 10 and blade carrier 1
The air tube 13 is inserted between them. The switching valve 28 and the pressure gauge 2 are connected to the air tube 13 through a pipe line.
9 and the pressure reducing valve 30 are connected. The switching valve 28 switches the supply of air to the air tube 13 and the release of air, and the pressure reducing valve 30 adjusts the pressure of air supply to the air tube 13, and checks the pressure with a pressure gauge 29. .
Then, compressed air is supplied to the air tube 13 from an air supply source (not shown), and the blade carrier 11 is moved relative to the guide block 10 by utilizing the expansion of the air tube 13 and adjusting the amount of air. To raise and lower the force by which the counter blade 6 pushes the upper and lower wires 1 and 2. [0008] By the way, paper machines in recent years have become larger and larger, some of which have a width of about 10 m, and it has become extremely difficult to manufacture the counter blade 6 with high accuracy. In particular, since the counter blade 6 has a movable portion as described above, the number of constituent parts is large, the structure is complicated, and it is difficult to obtain accuracy. In particular, the accuracy of the blade carrier 11 is an issue. If the blade carrier 11 remains bent, the air tube 13 to be pressed is flexible and does not have a function to correct the bending, so that the blade 12 is pressed against the wire 2 in the bent shape. Become. Therefore,
Conventionally, a great deal of time and effort has been spent on improving the precision, that is, on re-bending and correction cutting. One solution is to extremely weaken the bending stiffness of the blade carrier. At that time, the compressed air is inflated to the air tube 13 and the air tube 13 is kept at a uniform height in the width direction. It is necessary that the blade carrier 11 has unevenness and pushes the upper and lower wires as shown in the unevenness of the air tube 13 because otherwise the blade carrier has no rigidity. It is even more difficult. The present invention has been made in view of the above problems, and an object of the present invention is to provide a paper machine counter blade with high accuracy and easy adjustment in order to form a blade carrier into a desired shape. [0010] In order to achieve the above object, the present invention provides a twin-wire former counter blade for removing moisture from a raw material by pressing the blade against a pair of wires sandwiching the raw material. A pressing device that generates air pressure by an air tube, and a pressing beam provided on an upper portion of the pressing device and extending in the width direction of the counter blade,
A blade carrier to which the above-mentioned blade is attached and which is disposed opposite to the upper part of the pressure beam, and which is disposed between the pressure beam and the blade carrier, and a vertical interval between them is set at an arbitrary position in the width direction. An adjustment member is provided which can adjust the shape of the blade carrier with the adjustment member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A counter blade for a special paper machine according to an embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show a counter blade 15 for a paper machine according to the present invention. An appropriate number of support beams 20 are bridged on both side surfaces of the counter blade box 4 (see FIG. 6), and a guide block 21 having a U-shaped cross section is fixed to the upper surface thereof with bolts 22 or the like. The guide block 21 is made of a main body 21a so as to be easily manufactured.
The guide plate 21b is fixed with bolts 21c. Inside the guide block 21, a pressure beam 2 extending in the lateral direction of the counter blade box with the air tube 13 interposed therebetween.
3 is housed so that the inner wall of the guide block 21 can be slid vertically. In the upper part of the guide block 21,
A blade carrier 24 is disposed so as to be slidable in the vertical direction on the upper inner wall of the guide block 21 so as to face the pressure beam 23. The pressure beam 23 and the blade carrier 24 having a gap above the pressure beam 23 are connected by adjusting bolts 26, and the adjusting bolts 26 are appropriately spaced in the width direction (for example, 15 mm).
0 to 200 mm). The adjusting bolt 26 has screw portions 26b, 2 on both sides of the head 26a.
6c are formed, and these two threaded portions 26b and 26c have
Reverse-wound threads are cut so that one is right-handed and the other left-handed. Therefore, by turning the adjustment bolt in one direction, the distance between the pressure beam 23 and the blade carrier 24 is increased, the position of the blade 12 is increased, and the blade is rotated in the other direction to reduce the distance. Twelve positions can be lowered. The lock nut 27 plays a role for restricting the rotation of the adjustment bolt 26. An adjusting bolt 26 is provided on the guide block 21.
A notch 21d is provided corresponding to a position having a notch.
By inserting a tool such as a spanner into the notch 21d, the head 26a of the adjustment bolt 26 and the lock nut 27 can be rotated. When the adjustment bolt 26 is rotated, the distance between the pressure beam 23 and the blade carrier 24 is changed,
The height position of the blade carrier 24 can be changed. The blade 12 is mounted on the blade carrier 24 via a groove, as in the related art. Next, the operation of the paper machine counter blade according to the present embodiment will be described. As shown in FIG. 3A, when the blade carrier 24 is bent,
As shown in FIG. 3B, by adjusting the interval between the pressure beam 23 and the blade carrier 24 with the adjustment bolt 26, the posture can be straightened in the lateral direction. Therefore, the arrangement of the tips of the blades 12 can be made as desired. At this time, as shown in FIG. 3B, the pressurizing beam 23 is bent by elastic deformation, but the pressing force of the air tube 13 is changed to the internal pressure P of the air tube 13 as shown in FIG.
Is large or small, the difference between the pressing force F and the deformation amount δ is small in the normal range as shown in the diagram of FIG. Conversely, the pressure beam 23 can be pressed with substantially uniform pressing force of the air tube 13 over the entire width because the pressure tube 23 is greatly deformed by a small difference in force. In addition, the bending rigidity of the pressure beam 23 and the bending rigidity of the blade carrier 24 are added and strengthened, and can be deformed by the contact pressure between the upper and lower wires 1 and 2, so that the blade 12 can be straightened even when the contact pressure is applied. Can be maintained. Next, another effect of the present embodiment will be described.
This will be described with reference to FIG. The support beam 20 is extremely long in the lateral direction as described above, and is normally deformed so that the center thereof hangs downward due to the contact pressure of the upper and lower wires 1 and 2 since only both ends are supported. At this time, although the contact pressure is made uniform to some extent by the air tube 13, the contact pressure between the upper and lower wires 1 and 2 tends to be lower at the center (in other words, the contact pressure at both ends becomes higher). Is inevitable. In such a case, it is desirable that the blade carrier 24 be shaped so that the central portion is higher than straight. Even in such a case, the blade carrier 24 can be changed to a desired height in the same manner as described above. As described above, in the related art, high accuracy has been obtained by repeatedly performing re-bending and correction cutting, but can now be performed only by adjustment with the adjustment bolt 26. Although the embodiments of the present invention have been described above, the present invention is, of course, not limited thereto, and various modifications can be made based on the technical concept of the present invention. As the adjustment member, an adjustment bolt 26 having reverse threaded portions 26b and 26c is used to adjust the interval between the pressure beam 23 and the blade carrier 24. However, a member capable of adjusting the interval is used. If so, other adjustment means can be used. For example, only the upper screw portion 26b is formed on the adjustment bolt 26, the lower portion is fixed to the pressure beam 23, and the blade carrier 24 is placed on a nut screwed on the screw portion 26b, and the height is adjusted with the nut. You may be able to. According to the present invention, in a twin-wire former counter blade for removing moisture from a raw material by pressing a blade against a pair of wires sandwiching the raw material, an air tube connected to an air supply source is used. A pressing device for generating pressure, a pressing beam provided on the pressing device and extending in the width direction of the counter blade, and supporting the blade, and disposed to face the upper portion of the pressing beam. A blade carrier, a blade support member disposed between the pressure beam and the blade carrier, and having a vertical interval between them adjustable at an arbitrary position in the width direction, is provided. By adjusting the spacing, the shape of the blade carrier can be easily corrected,
The work time for adjusting the height of each part of the blade can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a paper machine counter blade according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line XX in FIG. FIG. 3A is a schematic diagram before adjusting the interval between the pressure beam and the blade carrier, and FIG. 3B is a schematic diagram after adjusting the interval. 4A is a diagram showing a load deformation of an air tube, and FIG. 4B is a diagram showing a deformation characteristic of the air tube with respect to a load. FIG. 5 is a schematic diagram of a contact pressure distribution of a wire for explaining another effect of the present invention. FIG. 6 is a schematic side view showing the structure of a twin-wire former. FIG. 7 is a sectional view of a conventional paper machine counter blade. [Description of Signs] 1 Upper wire 2 Lower wire 3 Upper vacuum box 4 Counter blade box 5 Upper blade 7 Lead injection box 8 Transfer suction box 12 Blade 12a Tip 12b Body 13 Air tube 15 Counter blade 20 Support beam 21 Guide Block 21a Body 21b Guide plate 21c Bolt 21d Notch 22 Bolt 23 Pressure beam 24 Blade carrier 26 Adjusting bolt 26a Head 26b Thread 26c Thread 27 Lock nut

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) D21F 9/02 D21F 1/52

Claims (1)

(57) [Claim 1] In a twin-wire former counter blade which presses a blade against a pair of wires sandwiching a raw material to remove moisture from the raw material, pressing is performed by using an air tube to generate air pressure. A pressurizing beam provided at an upper portion of the pressing device and extending in a width direction of the counter blade; a blade carrier to which the blade is attached and which is disposed to face the upper portion of the pressurizing beam; An adjusting member is provided between the impression beam and the blade carrier, and an adjusting member for adjusting a vertical interval therebetween at an arbitrary position in the width direction is provided, and the adjusting member corrects the shape of the blade carrier. A counter blade for a paper machine, characterized in that: