JP2803990B2 - Slurry supply 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 slurry supply apparatus mainly used for manufacturing a plate-like building element made of a hydraulic material such as an outer wall or a roof tile.

[0002]

2. Description of the Related Art Conventionally, cement-based siding materials have been used as architectural boards having excellent nonflammability. As equipment for manufacturing a raw board of this building board, a slurry containing a hydraulic material such as cement is continuously supplied on a water-permeable sheet traveling in the longitudinal direction, and the slurry is provided on the lower surface of the sheet. There is also known a method in which a slurry is hardened by dehydrating under reduced pressure from below using suction means (for example, see JP-A-4-153004).

[0003] In this case, the slurry supply device is configured such that a hopper in which slurry is stored is disposed on the sheet, and a plate-shaped gate member for regulating the thickness of the slurry between the sheet and the hopper is provided. By providing the slurry at a lower portion of the hopper and on the exit side in the sheet traveling direction, the slurry is supplied onto the sheet at a substantially constant thickness.

[0004]

Among the slurries in the hopper, the slurries close to the inner surfaces of the hopper on both sides in the sheet width direction receive a frictional force backward from the inner surface of the hopper or have an adhesive force with the inner surface. . Therefore, since the slurry in the center in the sheet width direction is slightly easier to flow out than the slurry on both sides in the same direction, the outflow amount of the slurry passing between the gate member and the sheet may be biased toward the center in the sheet width direction. is there.

[0005] For this reason, conventionally, the slurry was supplied onto the sheet in a slightly raised state at the center in the sheet width direction, and the supply thickness of the slurry was sometimes not uniform. When the slurry having such a non-uniform thickness is subsequently decompressed and dewatered in the thickness direction or compressed, the density of the green sheet in the sheet width direction becomes non-uniform, and the quality of the building element as a final product also decreases. Will be.

If the slurry supply thickness is not uniform,
The slurry deforms in a wavy shape in the sheet traveling direction,
The density of the green sheet in the sheet advancing direction may also be non-uniform. In view of such a situation, the present invention supplies the slurry with a uniform thickness in the sheet width direction by increasing the outflow resistance of the slurry at the center part in the sheet width direction more than the outflow resistance of the slurry at both ends in the same direction. An object of the present invention is to improve the quality of a plate-shaped product as much as possible.

It is another object of the present invention to adjust the degree of increase of the outflow resistance in accordance with the state of the slurry so that even if the composition or material of the slurry changes, the slurry can be uniformly supplied in the sheet width direction. .

[0008]

In order to achieve the above object,
The present invention has taken the following technical measures. That is, according to the present invention, the hopper in which the slurry is stored is disposed on a sheet having water permeability that advances in the longitudinal direction, and a gate member that regulates the thickness of the slurry between the hopper and the sheet is disposed below the hopper. In the slurry supply device provided on the exit side in the sheet traveling direction, resistance increasing means for increasing the outflow resistance of the slurry at the center portion in the sheet width direction of the gate member than the outflow resistance of the slurry at both ends in the same direction is provided. Things.

In this case, the resistance increasing means can be constituted by forming the contact surface of the gate member with the slurry so that the central portion in the sheet width direction is larger in the sheet longitudinal direction than both ends in the same direction. Further, the resistance increasing means may be configured by providing a pressing member for pressing down a central portion of the gate member in the sheet width direction.

Further, the resistance increasing means forms the contact surface of the gate member with the slurry so that the central portion in the sheet width direction is swelled in the sheet longitudinal direction more than both ends in the same direction, and the gate member has a central portion in the sheet width direction. It can be constituted by providing a push-down member for pushing down the portion downward. In this case, for the reason described later, it is effective to provide a tilt means for vertically swinging the edge of the gate member in the sheet advancing direction in addition to the resistance increasing means.

[0011]

As described above, the hoppers 1 on both sides in the sheet width direction are used.
8, the slurry 1 at the center in the sheet width direction is originally easier to flow out than the slurries 1 on both sides in the same direction due to frictional force and the like received from the inner surface. Is greater than the outflow resistance of the slurry 1 at both ends in the same direction, the outflow resistance of the slurry 1 from below the gate member 20 is made uniform in the sheet width direction. The slurry 1 can be supplied with a uniform thickness in the sheet width direction.

As the resistance increasing means 27, the gate member 2
The contact surface with the slurry of No. 0 is formed such that the central portion in the sheet width direction is swelled in the sheet longitudinal direction more than both ends in the same direction, and a push-down member 60 for pushing down the central portion in the sheet width direction of the gate member 20 is provided. However, in this case, it is effective to provide a tilting means 55 for vertically swinging the edge of the gate member 20 in the sheet advancing direction.

That is, when the gate member 20 whose central portion in the sheet width direction is swollen or the exit side edge portion of the gate member 20 whose central portion is curved downward, the inclination of the gate member 20 changes, The outflow resistance of the slurry 1 at the central portion is increased or decreased, whereby the degree of increase in the outflow resistance of the slurry 1 is adjusted.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 shows a raw plate manufacturing apparatus 3 for manufacturing a continuous plate-shaped raw plate 3A by dewatering the slurry 1 from the lower surface of the sheet 2 under reduced pressure. The raw plate manufacturing apparatus 3 includes a sheet 2 having water permeability on an upper surface to which the slurry 1 is supplied, a number of suction boxes 4 for depressurizing and dewatering the slurry 1 from a lower surface of the sheet 2, and upper surfaces on both left and right ends of the sheet 2. And a supply device 6 for supplying the slurry 1 to the upper surface of the sheet 2.

The sheet 2 is formed by forming a long belt-like felt or woven fabric in an annular shape, and is circulated by a plurality of rollers 7 at a constant speed in the longitudinal direction (the direction of the arrow in FIG. 2). A large number of the suction boxes 4 are provided in an annular loop of the seat 2. Each suction box 4 is fixed to the outer periphery of a chain wound around a pair of front and rear sprockets 8 and 9, and is in close contact with the lower surface of the seat 2. While seat 2
It runs at the same speed as.

A suction rail 10 for depressurizing the inside of the box 4 is erected in an annular loop composed of a large number of suction boxes 4. Above the rail 10, an upper surface of the slurry 1 being dewatered under reduced pressure is provided. The press roll 11 which pressurizes this while leveling is provided. The annular belt 5 is for specifying the width of the slurry supplied to the upper surface of the sheet 2, and is provided in a pair on both sides in the width direction of the sheet 2.

The belt 5 is made of a material having watertightness and elasticity such as synthetic rubber, and a projecting portion 13 having a rectangular cross section is integrally formed on the upper surface of the sheet 2 from the center of the upper surface of the belt-like portion 12 grounded. By doing so, it is formed in a T-shaped cross section. The belt 5 is wound around the outside of the sheet 2 so that the belt-shaped portion 12 advances in contact with the upper surface of both ends in the width direction of the sheet 2. Have been.

As shown in FIG. 3, among a number of pulleys supporting the belt 5, a rear pulley 14 provided on the upper rear end of the manufacturing apparatus is substantially the same as a rear roll 15 guiding the rear upper portion of the sheet 2. This roll with height 1
5 (left side in FIG. 2). The rear pulley 14 is spline-fitted to a support shaft 16 that is rotatably mounted in the seat width direction. By sliding the rear pulley 14 along the support shaft 16, the width position with respect to the seat 3 can be changed. It has become.

As shown in FIG. 4 or 5, between the rear roll 15 and the suction box 4, the sheet 2 is slightly inclined upward in the direction of travel. Raw plate 3 obtained by dehydrating slurry 1 under reduced pressure
Is transferred to a cutting conveyor (not shown) provided on the downstream side of the sheet 2 after passing through the press roll 11, cut into a certain length on this conveyor, and subjected to dehydration and patterning by another press device. After going, it will be subjected to autoclave curing.

As shown in FIG. 1, the slurry 1 supply device 6 includes a hopper 18 in which the slurry 1 is stored.
And a chute 19 for dropping the slurry 1 into the hopper 18 and a gate member 20 for regulating the thickness of the slurry 1 between the hopper 18 and the sheet 2. In FIG. 2, the hopper 18 is arranged on the seat 3 and behind the rear sprocket 9, but may be arranged almost directly above the rear sprocket 9.

The hopper 18 includes a front plate 21 and a rear plate 2.
2 are connected to each other by a pair of side plates 23, and are formed in a wide rectangular tube shape with an open top and bottom. The lower end of the side plate 23 contacts the inside of the belt 5 and leaks the slurry 1. A lateral skirt plate 24 made of rubber is provided to prevent the slurry 1 from contacting the upper surface of the sheet 2 at the lower end of the rear plate 22.
Is provided with a rear skirt plate 25 for preventing leakage of the skirt.

The gate member 20 is provided below the hopper 18 and on the exit side in the sheet advancing direction.
The gate member 20 is a plate material made of steel (usually finished SUS steel) or a hard resin or the like which is long in the sheet width direction, and has a lower surface separated from an upper surface of the sheet 2 by a gate support device 26 described later so as to face the upper surface. It is arranged slightly below the lower end of the front plate 21.

Accordingly, the slurry 1 in the hopper 18 flows forward between the sheet 2 and the gate member 20 in the sheet traveling direction, and is supplied onto the sheet 2 while the supply thickness is regulated by the gate member 20. In the present embodiment, the contact surface (lower surface) of the gate member 20 with the slurry 1 is formed such that the central portion in the sheet width direction swells more in the sheet longitudinal direction than both ends in the same direction. A resistance increasing means 27 for increasing the outflow resistance of the slurry 1 at the center portion of the sheet 20 in the sheet width direction more than the outflow resistance of the slurry 1 at both end portions in the same direction.

That is, in this embodiment, as shown in FIG. 7 (a), the front edge 20A of the gate member 20 has its central portion in the sheet width direction bulged in the sheet advancing direction (the direction of the arrow in FIG. 7). The gate member 2 is formed to be slightly curved.
0 trailing edge 20B has a linear shape in the same direction as the sheet width direction. The planar shape of the gate member 20 may be such that the rear edge 20B is curved and the front edge 20A is straight as shown in FIG. 7B, or the front and rear edges 20A and 20B as shown in FIG. Both of them may be curved.
So that the frictional resistance with
Any shape may be used as long as the width gradually increases toward the center. However, it is preferable that at least the front edge be curved in order to effectively operate the tilting means 55 described later.

As shown in FIGS. 4 to 6, the gate support device 26 includes a support plate 28 slidably provided on the lower portion of the outer surface of the front plate 21, and a support column fixed to the front surfaces of the left and right ends of the support plate 28. 29, a support shaft 30 rotatably installed between the lower portions of the left and right columns 29, and a support plate 2
8 is provided with height adjusting means 31 for adjusting the height from the seat 2.

The support plate 28 is formed to have substantially the same width as the front plate 21 and has a vertically long hole 32 at the center. As shown in FIG. 4, a bolt 33 protruding forward from the front plate 21 is inserted into the long hole 32, and the bolt 33 is inserted into the coil spring 3.
The support plate 28 is supported on the lower part of the outer surface of the front plate 21 so as to be slidable up and down by being tightened with a nut 35 via the nut 4.

The column 29 is made of a steel bar, and is vertically fixed to the front surface of the left and right ends of the support plate 28.
A pair of upper and lower pressing rollers 3 protruding from the inner surface of the side plate 23
6 is pressed against the front plate 21 together with the support plate 28. Pins 37 protruding inward in the sheet width direction are fixed to lower ends of the columns 29, and both ends of the support shaft 30 are rotatably supported by the pins 37.

The support shaft 30 is made of a solid round bar made of steel, and has a groove 38 formed by cutting a lower portion of the cross section forward and extending in the axial direction. A plurality of mounting brackets 39 and 40 projecting in the sheet advancing direction are fixed to both ends and a central portion of the support shaft 30, and the gate member 20 is mounted on the lower surface side of each of the mounting brackets 39 and 40. I have.

As shown in FIG. 4, a fixing block 41 fixed to the center of the gate member 20 is fixed to the lower surface of the center mounting bracket 39 via three fixing bolts 42 and 43. Of these fixing bolts 42 and 43,
The fixing bolts 43 on both sides are screwed to the fixing block 41, but the middle fixing bolt 42 is screwed only to the mounting bracket 39, and the lower end thereof is in contact with the upper surface of the fixing block 41.

On the other hand, as shown in FIG. 5, at the lower portions of the mounting brackets 40 on both sides in the seat width direction, pivot blocks 44 fixed to both ends of the gate member 20 in the same direction are pivotally mounted via a horizontal shaft 45. ing. As described above, when the gate member 20 is supported via the support shaft 30 made of a solid round bar, the rigidity in the sheet width direction is improved as compared with the case where the gate member 20 is attached to the support plate 28 by a simple hinge or the like. This has the advantage that excessive deformation of the gate member 20 can be prevented.

A rubber seal plate 46 is attached to the outer surface of the lower end of the support plate 28.
The slurry 1 is prevented from leaking from behind the support shaft 30 by bringing the back surface of the support shaft 30 into contact with the support shaft 30. Further, a rubber sealing material 47 is accommodated in the groove 38 of the support shaft 30, and the edge of the gate member 20 is brought into contact with the sealing material 47, so that the slurry is formed between the support shaft 30 and the gate member 20. 1 is prevented from leaking.

The height adjusting means 31 includes a rod 48 erected on the upper end of the column 29 and a rotary operating means 49 for vertically moving the rod 48 by a rotating operation. A support cylinder 51 fixed on a flange plate 50 protruding from an upper end of the support cylinder 51, and an operation cylinder 53 with a handle 52 which is externally fitted to the support cylinder 51 and screwed thereto. The rod 48 is rotatably inserted into the support cylinder 51,
The upper end of the handle 52 is fixed to the operation cylinder 53,
When the operating cylinder 53 is turned by the
, So that the height of the gate member 20 can be adjusted via the rod 48 and the support 29. Reference numeral 54 denotes a joint for adjusting the length of the rod 48.

The gate support device 26 has a tilting means 5 for adjusting the degree of increase in the outflow resistance of the slurry 1.
5 are provided. As shown in FIG. 5, the tilting means 55 of this embodiment comprises a manual turnbuckle 56, and a hook 57 screwed to one end of the turnbuckle 56.
Is connected to the mounting bracket 40 fixed to the end of the support shaft 30 by a pin, and the other hook 58 screwed to the other end is connected to a bracket 59 projecting from the upper front surface of the support plate 28 by a pin. I have.

Therefore, when the turn buckle 56 is rotated, the mounting bracket 40 is rotated around the support shaft 30, whereby the edge (front edge) of the gate member 20 in the sheet traveling direction is swung up and down. The Rukoto. It should be noted that a fluid pressure cylinder may be employed instead of the turnbuckle 56. Next, the operation of the slurry 1 supply device 6 will be described.

The slurry 1 obtained by kneading cement, water, aggregate, reinforcing fibers and the like in a constant mixture accumulates in the hopper 18 as it is thrown in from the chute 19, and the slurry 1 in the hopper 18 The sheet flows forward from between the gate members 20 in the sheet advancing direction, and the gate member 20
Is supplied onto the sheet 2 while its supply thickness is regulated.

At this time, since the central portion of the gate member 20 in the sheet width direction is curved in the sheet advancing direction, the slurry 1 flowing thereunder receives a greater frictional force from the central portion of the gate member 20 and the slurry 1 flows in the sheet width direction. The outflow resistance of the slurry 1 at the center increases. However, among the slurries 1 in the hopper 18, the slurries 1 close to the inner surface of the side plate 23 receive a frictional force rearward from the inner surface,
Moreover, since an adhesive force is generated between the slurry 1 and the inner surface, the slurry 1 at the center in the sheet width direction is more
It is easier to leak than originally.

Therefore, when the outflow resistance of the slurry 1 at the center in the width direction is increased by the gate member 20 (resistance increasing means 27), the outflow resistance of the slurry 1 is made uniform in the sheet width direction, and the slurry 1 is removed. The sheet is supplied with a uniform thickness in the sheet width direction. On the other hand, the frictional resistance between the slurry 1 and the gate member 20 and between the slurry 1 and the side plate 23 may change due to a change in the water content or the concentration of the reinforcing fiber. By turning the turnbuckle 56 of the means 55 to swing the front edge of the gate member 20 up and down, the degree of resistance increase by the resistance increasing means 27 is adjusted.

That is, when the resistance increasing function of the resistance increasing means 27 is too weak, when the front edge of the gate member 20 is displaced downward by the turn buckle 56, the center of the front edge in the sheet width direction becomes the both ends. Closer to sheet 2 than
The outflow resistance in the central part increases. On the other hand, if the resistance increasing function of the resistance increasing means 27 is too strong, the front edge of the gate member 20 may be displaced upward by the turnbuckle 56.

FIG. 8 shows a modification of the resistance increasing means 27. In this case, the gate member 20 is made of a plate material having a constant width, and the resistance increasing means 27 is configured by providing a push-down member 60 that pushes down the center of the gate member 20 in the sheet width direction. The push-down member 60 is composed of a fluid pressure cylinder fixed to the lower center in the width direction of the front plate 21, and the lower end of a rod 61 extended and retracted by this cylinder is connected to the upper center surface of the gate member 20. The gate member 20 is bridged in the seat width direction by connecting both ends of the gate member 20 to the bracket 62 projecting from the side plate 23 with pins.

According to the resistance increasing means 27, when the gate member 20 is depressed by operating the depressing member 60, the gate member 20 is slightly convexly curved, whereby the slurry 1 at the central portion in the sheet width direction is formed. Outflow resistance can be increased. Note that the turnbuckle 56 may be used as the pressing member 60, and the tilting means 55 may be added in this modification. Also,
After the gate member 20 shown in FIG. 7 is employed, a pressing member 60 may be further provided.

The above embodiments are illustrative and not restrictive. That is, the scope of the present invention is defined by the appended claims, and all modifications that fall within the meaning of the claims are included in the present invention.

[0042]

As described above, according to the present invention,
The resistance increasing means 27 is provided so that the outflow resistance of the slurry 1 at the center in the sheet width direction of the gate member 20 is greater than the outflow resistance of the slurry 1 at both ends in the same direction.
The outflow resistance of the slurry 1 from below the gate member 20 is made uniform in the sheet width direction, so that the slurry 1 can be supplied at a uniform thickness in the sheet width direction, and the quality of the plate-like product can be improved.

When tilt means 55 for vertically swinging the edge of the gate member 20 in the sheet advancing direction is provided.
Since the degree of increase in the outflow resistance of the slurry 1 in the sheet width direction can be adjusted, uniform material supply in the sheet width direction can be ensured even if the composition or the material of the slurry 1 changes.

[Brief description of the drawings]

FIG. 1 is a perspective view of a slurry supply device.

FIG. 2 is a schematic side view of a raw plate manufacturing apparatus.

FIG. 3 is a perspective view showing a rear part of the raw plate manufacturing apparatus.

FIG. 4 is a sectional view taken along line AA of FIG. 1;

FIG. 5 is a sectional view taken along line BB of FIG. 1;

FIG. 6 is a sectional view taken along line CC of FIG. 1;

FIG. 7 is a plan view showing an aspect of a shape of a gate member.

FIG. 8 is a front view of a resistance increasing unit provided with a pressing member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Slurry 2 Sheet 6 Feeder 18 Hopper 20 Gate member 27 Resistance increasing means 55 Tilt means 60 Push-down member

Claims (5)

(57) [Claims] 1. A hopper (18) in which a slurry (1) is stored is disposed on a water-permeable sheet (2) that advances in a longitudinal direction, and a slurry (1) is formed between the sheet and the sheet (2). A gate member (20) for regulating the thickness of the slurry is provided below the hopper (18) and on the exit side in the sheet traveling direction; A slurry supply device comprising a resistance increasing means (27) for increasing the outflow resistance of (1) above the outflow resistance of the slurry (1) at both ends in the same direction. 2. The resistance increasing means (27) forms a contact surface of the gate member (20) with the slurry (1) such that the central portion in the sheet width direction is swelled in the sheet longitudinal direction more than both ends in the same direction. The slurry supply device according to claim 1, wherein the slurry supply device is constituted by: 3. The slurry supply according to claim 1, wherein the resistance increasing means (27) is provided with a pushing-down member (60) for pushing down a central portion in the sheet width direction of the gate member (20). apparatus. 4. The resistance increasing means (27) forms a contact surface of the gate member (20) with the slurry (1) such that the central portion in the sheet width direction is swelled in the sheet longitudinal direction more than both ends in the same direction. At the same time, a push-down member (6) that pushes down the center of the gate member (20) in the sheet width direction.
The slurry supply device according to claim 1, wherein the slurry supply device is configured by providing (0). 5. The slurry supply device according to claim 2, further comprising a tilting means (55) for vertically swinging an edge of the gate member (20) in the sheet traveling direction.