JP2763728B2 - Raw board manufacturing apparatus and raw board manufacturing method for building boards - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for producing a green board for building boards.

[0002]

2. Description of the Related Art Conventionally, there is a winding method as a method of manufacturing a building board. In this method, a thin slurry is applied to a felt that travels in a certain direction by papermaking or the like, and the thin slurry is wound around a making roll in a layered manner until a predetermined number of layers are formed, and then the layered slurry is cut in the width direction. Then, a raw plate is formed by peeling the raw plate from the making roll, and the raw plate is cut into a predetermined size, and then cured to obtain a plate member having a predetermined shape (see, for example, JP-A-4-47905). ).

However, when the slurry is wound around the making roll in a layered manner, peeling is likely to occur between the layers, and there is a limit to the thickness of the plate that can be made due to the difference in inner and outer diameters at the time of winding. Therefore, as a flow-on type manufacturing method for manufacturing a raw sheet without using a making roll, a sheet having a water permeability that circulates a high-concentration slurry containing a reinforcing fiber and having a solid concentration of about 25% in a certain direction. There has been proposed a method in which a single layer and a desired thickness are supplied all at once, and the slurry is dehydrated under reduced pressure by suction means provided on the lower surface of the sheet (for example, see Japanese Patent Application Laid-Open No. 4-153004).

[0004]

However, when the slurry is supplied in a single layer on a sheet, the specific gravity of reinforcing fibers (pulp or the like) added to the slurry is smaller than that of cement or silica sand. When the slurry is supplied onto the sheet, the reinforcing fibers float in the thickness direction and are unevenly distributed. As a result, there is an inconvenience that the reinforcing fibers cannot sufficiently improve the strength.

In the case of the above-mentioned flow-on system, the reinforcing fibers in the slurry are oriented in various directions when the raw material is supplied, and the orientation of the reinforcing fibers is poor. Therefore, the bending strength of the board in a specific direction is improved. I couldn't do that. The present invention
In view of such circumstances, the objective is to prevent the reinforcing fibers contained in the slurry from being unevenly distributed in the thickness direction of the slurry after being supplied, and to improve the quality of the product by increasing the orientation of the reinforcing fibers. And

[0006]

In order to achieve the above object,
The present invention has taken the following technical measures. That is, in the invention according to claim 1, a sheet having water permeability is provided so as to be able to advance in the longitudinal direction, and a raw material supply device for supplying a slurry containing reinforcing fibers to the upper surface of the sheet is provided above the sheet. In a building board raw sheet manufacturing apparatus provided with suction means for depressurizing and dehydrating slurry on the lower surface, the raw material supply device can be reciprocated back and forth in the sheet traveling direction within a range where the suction means is provided. It is characterized by.

According to a second aspect of the present invention, a slurry containing reinforcing fibers is supplied from a raw material supply device provided above the sheet to the upper surface of a sheet having water permeability which advances in the longitudinal direction, and this slurry is used as the slurry. In the method for producing a raw board of a building board in which dehydration under reduced pressure is performed by suction means provided on the lower surface of the sheet, the raw material supply device is reciprocated back and forth in the sheet traveling direction within a range where the suction means is provided. The slurry is supplied while the slurry is being supplied.

[0008]

The material supply device reciprocates back and forth in the sheet advancing direction, so that a material flow in the sheet advancing direction occurs in the slurry immediately after the supply due to the speed difference between the material supply device and the sheet, and the reinforcing fibers in the slurry are removed from the sheet. In the direction of travel. Since the raw material supply device moves within the range where the suction means is provided, the slurry is dewatered under reduced pressure immediately after being supplied to the sheet. Therefore, the reinforcing fibers in the slurry are adsorbed on the sheet side together with the flow of moisture due to the dehydration under reduced pressure, and the slurry is prevented from floating in the thickness direction.

[0009]

An embodiment of the present invention will be described below in detail with reference to the drawings. In FIG. 1, a raw plate manufacturing apparatus 1 according to the present embodiment
Is provided on a base frame 2 framed on the floor, an annular sheet 3 to which slurry is supplied to the upper surface, a number of suction boxes 4 for depressurizing and dewatering the slurry from the lower surface of the sheet 3, and An annular belt 5 that advances in contact
And a raw material supply device 6 for supplying a slurry to the upper surface of the sheet 3.

The base frame 2 is formed by connecting a plurality of portal frames 7 in the material transport direction (the horizontal direction in FIG. 1), and is located at the lower part of each portal frame 7 and at the front and rear ends of the base frame 2 in the material transport direction. A guide roll 8 that can rotate around an axis in the width direction of the seat 3 is provided on an upper portion of the gate-shaped frame 7. The sheet 3 is made of a long band member having water permeability such as felt or woven fabric, and is formed in an annular shape over the entire length of the base frame 2. The sheet 3 is wound around each guide roll 8 and circulated by a drive motor 9 provided on the floor so as to advance in the longitudinal direction. The circulating direction is such that the upper surface of the sheet 3 is substantially horizontal. The traveling direction is from the rear (the left side in FIG. 1) of the frame 2 to the front (the right side in FIG. 1).

In the loop of the seat 3 and at the front and rear portions of the base frame 2, large-diameter front and rear sprockets 11 and 12 rotatable around a horizontal axis 10 facing the width direction of the seat 3 are arranged. The suction box 4 is fixed to the outer peripheral side of the transport chain 13 wound around the suction box 4. The front sprocket 11 is connected to a motor 14 provided on an upper portion of the base frame 2 by a drive chain 15. By the rotation of the front sprocket 11, each suction box 4 contacts the lower surface of the seat 3 in the same direction and the same direction as the seat 3. It circulates at speed.

On the left and right sides of the upper end of each of the portal frames 7 located between the front and rear sprockets 11 and 12, suction suction rails 16 having a hollow cross section whose inside is decompressed by a Nash pump or the like (not shown) are provided in the front and rear direction of the base frame 2. Each suction box 4 erected along and circulated by the sprockets 11 and 12 is slidably moved on a suction rail 16 above the base frame 2. The suction rail 16 is provided over a range indicated by a section S in FIG.

As shown in FIG. 2, each suction box 4 is formed of a hollow box having a large number of water absorption holes 18 in a top plate 17 and provided on the left and right sides of a lower plate 19 on the suction rail 16 side. A long hole 21 long in the front-rear direction communicating with the pressure reducing hole 20 is provided. The inside of the suction box 4
The room is divided into two upper and lower rooms by a horizontal middle plate 22, and the middle plate 22 is provided with a large number of ventilation holes 23.

Therefore, while each suction box 4 slides on the suction rail 16 in the suction section S, the pressure inside the suction box 4 is reduced at a substantially constant pressure through the communication between the pressure reducing holes 20 and the elongated holes 21. The slurry supplied to the upper surface of the water-permeable sheet 3 is dewatered under reduced pressure from the lower surface of the sheet 3 through the water absorption holes 18 of the suction box 4.

The belt 5 specifies the width of the slurry supplied to the upper surface of the sheet 3, and is made of a watertight and elastic material such as synthetic rubber. This belt 5
Is formed in a T-shaped cross section by integrally projecting a protruding portion 25 having a rectangular cross section from the center of the upper surface of the band portion 24 in contact with the upper surface of the sheet 3. It is a ring that crosses.

A pair of left and right pulleys 26 for guiding the belt 5 are provided with a guide roll 8 for supporting the sheet 3 at a lower portion of each of the portal frames 7 and an upper portion of the portal frame 7 located at the front and rear ends of the base frame 2. Are provided separately. The belt 5 is wound around each of the pulleys 26 and provided on both sides in the width direction of the sheet 3, and in a state where the belt-shaped portions 24 are in contact with the upper surfaces of both ends in the width direction of the sheet 3, at the same speed as the sheet 3. Circulated in the same direction. The driving source of the belt 6 is as follows.
The driving motor 9 for driving the seat 3 is shared.

A plurality of press rolls 27 are connected to the front upper part of the base frame 2 in the front-rear direction. The dehydration proceeds further by the reduction. On the downstream side of the sheet 3, a raw sheet cutting conveyor 28 is arranged at the same level as the upper surface of the sheet 3, and the raw sheet that has passed through the press roll 27 is cut into appropriate dimensions on the conveyor 28, After dehydration and patterning are performed by another press device, the product is subjected to autoclave curing.

As shown in FIGS. 3 to 6, the raw material supply device 6 includes a trolley 31 having wheels 30 on both sides in the width direction, and a pair of front and rear members rotating about the widthwise axis of the seat 3 in the trolley 31. Rolls 32F, 32R and a pair of rolls 32
A chute 33 for supplying the slurry between F and 32R is provided. The cart 31 has side plates 35 fixed to the left and right sides of a frame 34 framed in a rectangular shape in a plan view.
An axle 36 having wheels 30 rotatably provided at both ends is inserted through the outside of the vehicle.

On both left and right sides of the base frame 2, suction sections S
Is provided with a rail 37 extending in the traveling direction of the seat 3, and by mounting the wheels 30 on the rail 37, the carriage 31 can travel in the traveling direction of the seat 3.
A column 38 is erected in the center of the front part of the frame 34, and one end of a crank arm 40 horizontally oscillated by an electric motor (not shown) is pivotally mounted on a crank pin 39 provided at the upper end of the column 38. . Accordingly, the carriage 31 (the raw material supply device 6) is reciprocally movable back and forth in the advancing direction of the seat 3 in the suction section S via the horizontal swing of the crank arm 40. In addition, a rack and pinion mechanism or a chain sprocket mechanism or the like can be adopted as the reciprocating means for moving the carriage 31.

Each of the rolls 32F, 32R is rotatable about an axis in the width direction of the seat 3 by pivotally connecting a pivot 41 projecting from the shaft end to an intermediate portion of the side plate 35. The rolls 32F, 32R are arranged at a certain interval in the traveling direction of the sheet 3 and close to the upper surface of the sheet 3.
The supply section 42 of the slurry that is long in the width direction of the sheet 3 is configured by the interval between the 32Rs.

A motor 44 for driving a roll is mounted on a mounting plate 43 provided outside the right side plate 35.
Is installed. The sprocket 45 fixed to the drive shaft of the motor 44 and the pivot 4 of the rolls 32F, 32R
1 A chain 4 is provided between a sprocket 46 provided at the right end.
7 is wound around, and a pair of front and rear rolls 32F, 3
The 2R is rotated by the chain drive mechanism at the same speed in the direction in which the opposing inner sides (the supply unit 42 side) move upward.

At both ends in the axial direction of the pair of rolls 32F, 32R, there are provided outflow prevention plates 48 for preventing the slurry entering the supply unit 42 from flowing out of the sheet 3 in the width direction. The outflow prevention plate 48 is provided on one side surface of a steel backup plate 49 with a seal plate 5 made of rubber or the like.
0, and this seal plate 50 is
Roll 3 is brought into contact with the shaft end of 2F, 32R.
The supply part 42 between 2F and 32R is closed from the side.

The lower end of the seal plate 50 is in sliding contact with the belt portion 24 of the belt 5, thereby preventing the slurry from flowing out from between the seal plate 50 and the sheet 3. A fixed flange 52 having a pair of mounting pins 51 is fixed to the inner surface of the frame 34, and the outflow prevention plate 4 is attached to the tips of the pair of mounting pins 51.
8 is fixed, and a compression spring 53 that presses the outflow prevention plate 48 toward the rolls 32F and 32R is fitted around the shaft of the mounting pin 51.

The chute 33 is provided with a slurry supply pipe 5.
4 and a supply hopper 55 connected to the lower end of the supply pipe 54
And The lower end of the supply pipe 54 is supported by a bracket 56 projecting rearward from the rear surface of the column 38, and the base end of the bracket 56 has a vertically long slot 57 on each of the right and left mounting plates. 58 are provided.
The mounting plate 58 is fixed to the support 3 by screws 59 inserted through the long holes 57.
8, whereby the chute 33 is supported on a column 38 so as to be adjustable in height from the seat 3.

The supply hopper 55 has a tapered cylindrical main body 59 which spreads in the width direction of the sheet 3 toward the lower part.
And a discharge portion 60 extending vertically downward from the lower end opening of the main body portion 59. The lower end opening of the discharge portion 60 is
It is arranged so that it may be located in the supply part 42 between F and 32R. The main body 59 of the supply hopper 55 is
An impact plate 61 for spreading the slurry flowing down from the sheet 3 in the width direction of the sheet 3 is provided on the lower surface side. The collision plate 61 has a substantially triangular plate shape, and is arranged in a rearward inclined shape such that the bottom side thereof is located below.

At the joint between the pivot 41 of the rolls 32F and 32R and the side plate 35, the rolls 32F and 32R are provided.
Height adjusting means 62 is provided. The height adjusting means 62 finely adjusts the height of the rolls 32F, 32R from the sheet 3 for specifying the supply thickness of the slurry, and is provided on the outer surface of the side plate 35 so as to be slidable up and down. The movable plate 63 includes a jack 65 attached to a bracket 64 fixed to an upper end of the movable plate 63.

The jack 65 has an outer cylinder 66 erected on the upper surface of a bracket 64 and an inner cylinder 68 having a screw hole 67 formed in the axial center thereof, which is rotatable relative to the outer cylinder 66. The rod 69 is screwed into the screw hole 67 of the inner cylinder 68 so that it cannot move in the axial direction. An operation lever 70 is provided at the upper end of the inner cylinder 68. A lock lever 71 that regulates the relative rotation of the inner cylinder 68 with respect to the outer cylinder 66 is provided on the peripheral side of the outer cylinder 66, and the upper end of the inner cylinder 68 has a protrusion amount of the upper end of the rod 69. A scale cap 72 with a vertical scale made of a transparent material that can be viewed is provided.

The lower end of the rod 69 is
The pivots 41 of the rolls 32F, 32R are loosely inserted into vertically long slots 74 provided in the side plate 35 and provided on the movable plate 63. It is rotatably supported by a bearing 75. Therefore, the operating lever 70 of the jack 64
When the is rotated, the movable plate 63 moves up and down via the rod 69, and the height of the rolls 32F and 32R with respect to the sheet 3 can be adjusted.

Next, the operation of the raw material supply device 6 according to this embodiment will be described. First, in a batcher plant (not shown), a slurry obtained by mixing cement, silica sand, reinforced fibers such as pulp, water and the like in a constant weight part flows down the supply pipe 54 of the chute 33, Supply hopper 5
5 is discharged to the supply section 42 between the rolls 32F and 32R.

At this time, the slurry flowing out from the lower end of the supply pipe 54 has its kinetic energy absorbed by the collision plate 61 and diffuses in a divergent manner, and its flow velocity is slowed down. The sheet 3 falls to the supply section 42 and is uniformly spread in the width direction of the sheet 3. Further, in this case, since both ends in the axial direction between the rolls 32F and 32R are closed by the seal plate 50,
The raw material entering the supply unit 42 does not flow out to the outside in the width direction of the sheet 3, and the edges in the width direction of the raw plate are linearly aligned.

On the other hand, the raw material supply device 6 reciprocates back and forth in the traveling direction at a higher speed than the sheet 3 in a certain section of the suction section S during the supply of the slurry. A pair of rolls 32
The F and 32R are rotated at a higher speed than the seat 3 in a direction in which the opposing inner sides move upward. At this time, as shown in FIG.
As the rolls F and 32R rotate, they are lifted up by the peripheral surfaces of the rolls 32F and 32R, thereby generating a flow in the roll rotation direction in the slurry matrix. P is oriented in the traveling direction of the sheet 3.

Further, since the raw material supply device 6 reciprocates back and forth at a higher speed than the sheet 3 in the traveling direction thereof, the speed difference between the raw material supply device 6 and the sheet 3 causes the slurry immediately after the supply to enter the sheet 3 in the traveling direction. This causes the reinforcing fibers P in the slurry to be oriented in the traveling direction of the sheet 3. Further, the raw material supply device 6 is connected to the suction section S
Therefore, the slurry in the vicinity of the sheet 3 in the supply unit 42 is dehydrated under reduced pressure in the suction box 4 immediately after the supply. Accordingly, as shown in FIG. 8, the reinforcing fibers P existing in the slurry immediately after the supply are adsorbed downward together with the flow of the water W due to the dehydration under reduced pressure, whereby the reinforcing fibers P float in the thickness direction immediately after the supply of the slurry. Is prevented.

Further, since the excessive slurry is prevented from being supplied to the sheet 3 due to the stroke action of the rolls 32F and 32R, the slurry supply thickness in the sheet 3 advancing direction can be made uniform, and 32F,
Since 32R itself also moves in the traveling direction of the sheet 3, the upper surface of the supplied slurry is smoothed. In addition,
The present invention is not limited to the above-described embodiment, and may be provided, for example, so as to freely rotate without driving the rolls 32F and 32R.

The present invention can also be applied to a raw plate manufacturing apparatus 1 in which the suction box 4 is fixed to the base frame 2.

[0035]

As described above, according to the present invention,
Since the reinforcing fibers in the slurry are oriented in the advancing direction of the sheet, the bending strength in a specific direction of the board can be primarily improved, and the added value of the product can be increased. Further, according to the present invention, since the reinforcing fibers can be prevented from floating immediately after the supply of the slurry, the reinforcing fibers are not unevenly distributed in the thickness direction of the slurry after the supply, and the quality of the building board is stabilized. be able to.

[Brief description of the drawings]

FIG. 1 is a side view of a raw plate manufacturing apparatus.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view of a raw material supply device.

FIG. 4 is a front sectional view of the raw material supply device.

FIG. 5 is a side view of the raw material supply device.

FIG. 6 is a sectional view of a height adjusting unit.

FIG. 7 is an explanatory diagram of an operation of the raw material supply device.

FIG. 8 is an explanatory view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Raw plate manufacturing apparatus 3 Sheet 4 Suction means (suction box) 6 Raw material supply apparatus

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Shinobu Iida 2-47, Shishitsuhigashi, Namiwa-ku, Osaka-shi, Osaka Kubota Corporation (58) Field surveyed (Int. Cl. ⁶ , DB name) B28B 1/00-1/54 B28B 3/00-5/12 B28B 11/00-19/00

Claims (2)

(57) [Claims] 1. A raw material supply device (6) for supplying a slurry containing reinforcing fibers to an upper surface of a sheet (3) provided with a sheet (3) having water permeability so as to be able to advance in the longitudinal direction thereof. And a suction board (4) for depressurizing and dewatering the slurry on the lower surface of the sheet (3). The raw material supply device (6) is connected to the suction device (4) by the suction device (4). An apparatus for producing a raw board for building boards, wherein the sheet (3) can be reciprocated back and forth in the traveling direction within the provided range. 2. A slurry containing reinforcing fibers is supplied from a raw material supply device (6) provided above the sheet (3) to the upper surface of a sheet (3) having water permeability that advances in the longitudinal direction. The raw material supply device (6) is provided with the suction means (4) in a method for producing a raw board for a building board, wherein the raw material supply device (6) is dehydrated under reduced pressure by suction means (4) provided on the lower surface of the sheet (3). And supplying the slurry while reciprocating the sheet (3) back and forth in the advancing direction of the sheet (3) within a certain range.