JP2974921B2 - Raw plate manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a raw plate manufacturing apparatus.

[0002]

2. Description of the Related Art Conventionally, there is a method called a flow-on method as a method for producing a plate-like material such as an outer wall material or a roof tile. In this method, a relatively high-concentration slurry having a fixed concentration of 20 to 45% is supplied in a single layer and at a desired thickness onto an endless water-permeable sheet that can be circulated and run, and water contained in the slurry is removed from the sheet. The raw plate is left behind on the sheet by suctioning and removing the raw plate through the raw plate. The raw plate thus obtained is cut to a predetermined size and then cured (Japanese Patent Laid-Open No. -153004).

[0003] In order to remove moisture from the slurry on the sheet, a plurality of box-shaped decompression dehydration units (suction boxes) are connected to the outer peripheral side of the endless chain in a connected manner, and this connected body is connected to the sheet. Water is suctioned and removed by circulating and running synchronously inside the endless, and by making several decompression dewatering sections contact the lower surface of the sheet in a predetermined area in the sheet endless.

[0004] On the other hand, as another water removal method,
It is also known that a vacuum dewatering unit is fixed and an endless wire mesh band is passed between the upper part and the lower surface of the sheet synchronously with the sheet.

[0005]

In the method of circulating and running the connecting member of the decompression and dehydration section, the running of the connecting member is driven by the chain, so that the backlash when the chain meshes with the sprocket is directly reduced by the decompression and dehydration section. As a result, the unevenness is likely to occur in the deposited thickness of the supplied slurry, that is, the formed thickness of the raw plate. Further, since water cannot be removed between the decompression and dehydration sections, this also causes the formation pressure of the raw plate to be non-uniform.

In addition, a large-sized driving device is required to drive the plurality of decompression / dehydration units, and the running cost is increased, but the productivity is poor (the connected members of the decompression / dehydration units cannot be driven at high speed). there were. On the other hand, the method of circulating the wire mesh band has a drawback that the wire mesh band is easily clogged and must be cleaned frequently. In addition, the structure is dense and the frequency of breakage is high, and the entire wire mesh band must be replaced relatively early, which is extremely uneconomical.

The present invention has been made in view of the above circumstances, and is capable of producing a raw plate having a uniform thickness and reducing the running cost. It is intended to provide a device.

[0008]

According to the present invention, the following technical measures have been taken in order to achieve the above object. That is, in the present invention, an endless water-permeable sheet that can be circulated, and an endless water-permeable steel belt that is made to run synchronously with the sheet in a predetermined area inside the endless inside of the sheet in a predetermined area. A slurry supply unit provided at an upper portion of the sheet at an appropriate position on the upstream side, and a reduced-pressure dewatering unit provided at a lower portion of the steel belt in a region where the sheet and the steel belt run side by side,
The steel belt is characterized in that an upper surface inside the both side edges is pressed by a seal member so that the steel belt can run while maintaining a state in which both side edges protrude to a free end shape.

[0009] The seal member may press both side edges of the sheet further inside than the pressing portion against the steel belt. The seal member is preferably provided at least in a region corresponding to the decompression and dehydration unit.

[0010]

[Function] Although the sheet is circulated while being supported side by side by a steel belt and the decompression and dehydration section is fixed to the lower portion of the steel belt, the disadvantages of the prior art have been almost eliminated. By using a steel belt in this manner, it is necessary to prevent the slurry from spilling off from the side edge and to prevent the side edges of the steel belt from warping. Therefore, the upper surface of both side edges of the steel belt is pressed by a seal member.

In this case, in order to prevent both sides of the steel belt from being damaged or worn by friction with the seal member, the pressing position by the seal member is set inside the both sides of the steel belt. is there.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a raw sheet manufacturing apparatus 1 according to the present invention. In this raw sheet manufacturing apparatus 1, a pair of drive rollers 2 having at least one of them as a driving side and a plurality of guide rollers (including tension rollers) 3 are shown. With respect to the endless water-permeable sheet 5 erected and held so as to be able to circulate, an endless steel belt 8 is erected and held inside the endless by a pair of driving rollers 7 at least one of which is a driving side. Consisting of

The steel belt 8 has a tension-side portion (hereinafter, referred to as an “upper line”) provided between the drive rollers 7, and a portion between the drive rollers 2 in the sheet 5 (hereinafter, also referred to as “upper line”). (Referred to as "upper line") in a planar manner from below and supported therefrom. The running of the steel belt 8 is performed in synchronization with the seat 5 (at the same speed and in the same direction), and relative slip does not occur at the adjacent portions of the two.

A slurry supply section 12 is provided above the upper part of the upper line of the sheet 5 (left side in FIG. 1), and a first-stage decompression dewatering section 13 is provided below the sheet 5 corresponding to the slurry supply section 12. I have. Further, a decompression dewatering unit 18 is provided below the upper line of the steel belt 8.

A dehydration accelerating device 19 for pressing the film against the upper surface of the slurry to accelerate the dehydration effect and a press roller device 20 for complementing the dehydration are provided on the upper portion of the sheet 5 so as to correspond to the decompression and dehydration section 18. Have been. Reference numeral 21 denotes an apparatus for cleaning the steel belt 8, reference numeral 22 denotes an apparatus for removing foreign matter from the steel belt 8, reference numeral 23 denotes an apparatus for cleaning the sheet 5, and reference numeral 24 denotes an apparatus for dehydrating and drying the sheet 5.

The steel belt 8 is formed of a corrosion-resistant metal plate such as stainless steel. As shown in FIG. 2, a large number of through-holes 25 are arranged uniformly over the width of the steel belt and over the entire length in the longitudinal direction. Has been drilled,
As a result, water permeability is exhibited. Since the steel belt 8 is formed of a metal plate, it can be joined by welding unlike the case of a wire mesh band. For this reason, it is also possible to make the belt endless (it is sufficient to wind it) not to be endless at the stage before mounting the device, and to make it endless by welding when used at the time of replacement or the like. This has the advantage that the replacement operation can be performed easily and quickly.

If a steel belt 8 having high smoothness on the front and back surfaces is used, the sheet 5 can be supported side by side (that is, the surface properties of the sheet 5 can be smoothed).
In addition, since the running vibration in the decompression dewatering unit 18 can be reduced,
It is useful for increasing the surface smoothness as a raw plate. Further, when the front and back surfaces of the steel belt 8 are roughened, it is useful for preventing slippage with the sheet 5 and the driving roller 7. These may be appropriately selected depending on the shape required as a raw plate (product), the situation of the use site of the raw plate manufacturing apparatus 1, and the like.

The sheet 5 is made of felt or woven fabric, and has a water permeability in the material itself. The sheet 5 is formed narrower than the steel belt 8 as shown in FIG. 3, and all of the slurry that permeates to the lower part through the sheet 5 has a region (L) where the through holes 25 are formed in the width direction of the steel belt 8. (See dimensions).

The first-stage vacuum dewatering section 13 has a main suction box 27 and an auxiliary suction box 28. Each is a hollow box whose inside is appropriately depressurized by a suction device (not shown), and the upper surface thereof is a sliding support surface for supporting the sheet 5 in a planar shape. The first stage dehydration hole (not shown) is formed. Therefore, the slurry supplied from the slurry supply unit 12 onto the sheet 5 is immediately removed from the slurry by the first-stage vacuum dewatering unit 13 immediately at the time of the supply, whereby the fluidity is suppressed and the strength is improved. Things. for that reason,
Thereafter, in the process of being conveyed by the sheet 5, the slurry may be deformed so as to cause a difference in the deposition thickness,
In addition, generation of cracks and chips is prevented.

The vacuum dewatering section 18 has a plurality of suction boxes 31 arranged side by side along the traveling direction of the steel belt 8. Regarding these suction boxes 31,
The inside is a hollow box whose pressure is appropriately reduced by a suction device (not shown). As shown in FIG. 2, the upper surface thereof has a sliding support surface 31 for supporting the steel belt 8 in a planar manner.
a.

A large number of dehydration holes 3 are formed on the sliding support surface 31a.
3 are formed. These dehydration holes 33 have a long hole shape extending in a direction orthogonal to the traveling direction of the steel belt 8. Note that some of the dewatering holes 33 include round holes for dimension adjustment. The opening ends in the longitudinal direction of the dewatering holes 33 (excluding the outermost one in the width direction of the suction box 31) are not aligned along the traveling direction of the steel belt 8, that is, are irregular. Are arranged.

Therefore, even if the steel belt 8 is meandering, the through hole 25 and the dewatering hole 33 are provided.
Can be suppressed as little as possible,
There is an advantage that the suction operation as a whole can be made uniform and the suction pressure can be secured to a predetermined value or more. Further, since the dewatering holes 33 linearly rub against the through holes 25, it is also useful for improving drainage of the through holes 25.

The dewatering holes 33 are not limited to be orthogonal to the traveling direction of the steel belt 8, but may be inclined and intersect, and are formed linearly or curvedly. It may be something. In the present embodiment, the opening ratio of the through holes 25 in the steel belt 8 is 30%, and the dehydration holes 33 in each suction box 31 are set.
The opening ratio of the steel belt 8 was set to 20 to 30%, and the effective opening ratio during running of the steel belt 8 was maintained at 6 to 9%. The suction box 31 has all dehydration holes 33.
It is preferable to provide a slide shutter-type opening adjustment mechanism (not shown) that can change the opening area of the shutter at a glance.

It is preferable that each suction box 31 be controlled so that the suction pressure increases stepwise from the upstream side in the traveling direction of the steel belt 8. By doing so, dewatering can be performed efficiently while preventing deformation, cracks and chips from being generated in the deposited shape of the slurry. In addition, each suction box 31 may be formed into a single long box shape connected in series, and the inside may be partitioned into a plurality of chambers to control the suction pressure of each chamber.

In the vacuum dewatering section 18, the width of the sliding support surface 31a is formed smaller than the width of the steel belt 8 (but wider than the width of the sheet 5) as shown in FIG. Therefore, both side edges of the steel belt 8 project outward in the width direction from the sliding support surface 31a. On the upper portion of the sliding support surface 31a, a seal member 35 for pressing the upper surface portion inside the both side edges of the steel belt 8 toward the sliding support surface 31a at positions directly above the both ends in the width direction. Is provided. 3
Reference numeral 6 denotes a bracket for holding the seal member 35;
Is a spacer for keeping the positional relationship between the seal member 35 and the reduced-pressure dehydrating section 18 constant.

The seal member 35 is provided with an overhang 35b projecting inward from the pressing portion 35a against the steel belt 8 so as to be thin.
5b, the upper surface of both side edges of the sheet 5 is also slidably supported
1a. This sealing member 35
Is made of a resin material or the like having excellent watertightness and abrasion resistance and having a small coefficient of friction, and the slurry S supplied onto the sheet 5 spills from its side edge to the side edge of the steel belt 8. In addition to preventing the sheet 5 and the steel belt 8 from warping, this has an important effect.

The sealing member 35 is a steel belt 8
The pressing position (pressing portion 35a) is located inside the both side edges, so that the steel belt 8 runs as a free end without any interference between the upper and lower surfaces and the edges. The state is kept. for that reason,
Damage or wear of the steel belt 8 due to friction can be prevented as much as possible, and the life of the steel belt 8 can be extended.

The seal member 35 is preferably provided so as to correspond at least to the entire length of the decompression and dehydration section 18. Preferably, the sealing member 35 includes the portion from the slurry supply section 12 to the decompression and dehydration section 18. It can also be provided over the entire length of the line. By the way, in the present embodiment, of the drive rollers 7 for circulating the steel belt 8,
One of them is provided with a meandering prevention device 40 for the steel belt 8. The meandering prevention device 40 is configured to be able to change its inclination by expansion and contraction of a hydraulic cylinder 41 provided at one end or both ends of the rotation shaft 7a of the drive roller 7, and monitors the running of the steel belt 8. Feedback control is performed in combination with an appropriate monitoring means (not shown) for detecting meandering.

Further, utilizing this meandering prevention device 40,
Adjustment of the tension of the steel belt 8 (slip prevention control) is also possible. In the raw sheet manufacturing apparatus 1 thus configured, while the sheet 5 and the steel belt 8 are running synchronously, a slurry formed by kneading cement, aggregate, water, and the like at an appropriate mixing ratio is applied to the sheet 5 from the slurry supply unit 12. At the time of this supply, the first stage decompression dehydration unit 1
Initial dehydration is performed by 3 and the slurry is sent to the decompression dehydration unit 18 in a state having predetermined shape retention and strength.

In the decompression dehydrating section 18, the dehydration promoting device 1
Under the assisting action of 9, the water in the slurry is removed with high efficiency, and the dewatering action is complemented by the press roller device 20, so that the raw plate is left on the sheet 5. This raw sheet is cut to a predetermined length in a next step (not shown), cured through an autoclave or the like, and commercialized as a plate-shaped material such as an outer wall material or a roof tile.

In the raw sheet manufacturing apparatus 1, the use of the steel belt 8 allows a high tension to be applied, thereby increasing the running speed. In this embodiment, the speed is 20 m / min. By the way, conventionally, in the case where the connecting body of the decompression and dehydration unit is circulated and driven by the chain drive, the limit is about 8 m / min, and even the one using the wire mesh band is at most 15 m / min. Was.

In comparison with the output in this case, in the above embodiment, the motor used for running the steel belt 8 is 7 motors.
While a motor of 4 kW was sufficient, a motor used to drive the connecting body of the decompression and dehydration unit in a chain drive was 180 kW
w was required, and the motor used to run the wire mesh band was also 85 kw.

[0033]

According to the present invention, the sheet is circulated while supporting the sheet in a planar manner by a steel belt, and the decompression and dehydration section is fixed to a lower portion of the steel belt. By doing so, the disadvantages of the prior art are substantially eliminated, and since the inside of both side edges of the steel belt is pressed by a seal member, the slurry does not spill from the side edges, and the steel belt Warpage does not occur on both side edges. Therefore, waste of the slurry does not occur, and nonuniformity in the formed thickness of the raw plate can be prevented as much as possible.

Further, since both side edges of the steel belt do not come into contact with the seal member, there is no damage or wear due to friction, and the life of the steel belt can be extended. Therefore, the running cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing a raw plate manufacturing apparatus according to the present invention.

FIG. 2 is a plan view showing a vacuum dewatering unit and a steel belt.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Raw plate manufacturing apparatus 5 Sheet 8 Steel belt 12 Slurry supply part 13 First stage decompression dehydration part 18 Decompression dehydration part 31a Sliding support surface 33 Dehydration hole 35 Seal member

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-6-297425 (JP, A) JP-A-4-153004 (JP, A) JP-A-53-54219 (JP, A) JP-A-52-542 105928 (JP, A) Fully open sho 59-21903 (JP, U) Fully open sho 59-19304 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B28B 1/30 B28B 5 / 02

Claims (3)

(57) [Claims] An endless water-permeable sheet (5), which can be circulated, and synchronously travels in a predetermined area on the inside of the endless portion of the sheet (5) while being in planar contact with the sheet (5). An endless water-permeable steel belt (8), a slurry supply section (12) provided at an appropriate position on the upstream side of the sheet (5), and a sheet (5).
And a decompression dewatering section (18) provided in a region where the steel belt (8) runs side by side and below the steel belt (8), and the steel belt (8) has both side edges. A raw plate manufacturing apparatus characterized in that an upper surface portion inside the both side edges is pressed by a seal member (35) so that the vehicle can run while maintaining a state of protruding to a free end. 2. The device according to claim 1, wherein the sealing member presses both side edges of the seat further inside the pressing portion against the steel belt. 2. The raw plate manufacturing apparatus according to 1. 3. The raw plate manufacturing apparatus according to claim 1, wherein the seal member is provided at least in a region corresponding to the decompression dewatering unit.