JP2874146B2 - Cement slurry feeder in wet process - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cement slurry supply apparatus in a wet method, and more particularly, to a method of forming a plate-like body by supplying a cement slurry in layers on a forming and dewatering belt and sucking and dehydrating the slurry water on the belt. The present invention relates to an improvement of a cement slurry supply device in a wet method.

[0002]

2. Description of the Related Art Conventionally, as a method of manufacturing a fiber-reinforced cement board, as shown in FIG. There is known a method of manufacturing a fiber-reinforced cement board in which a plate-shaped body G is formed while suction-dewatering the water of the cement slurry C. The method for producing these fiber-reinforced cement boards is called a papermaking method or a flow-on molding method among so-called wet methods, and is well known as an industrial means for continuously producing large quantities of plate-like cement products.

[0003]

In the above-mentioned method of manufacturing a fiber reinforced cement board, if a flow box is used to supply the cement slurry C onto the forming and dewatering belt A, the flow of the cement slurry C is caused by natural flow. When the solid content concentration with respect to the water content of the cement slurry cannot be made too high to ensure the performance, the dewatering load increases, and the flow rate differs at both ends and the center of the overflow weir of the flow box due to natural flow Therefore, it is difficult to make the supply amount uniform, and the arrangement of the reinforcing fibers contained in the cement slurry is almost irregular, and the reinforcing effect of the reinforcing fibers cannot be effectively exhibited. Was.

When an extrusion feeder is used in place of the flow box, the cement slurry is forcibly extruded and supplied, and it is possible to increase the solid content concentration of the cement slurry with respect to the moisture to some extent. Specifically, in addition to being able to reduce the scale of the forming and dewatering belt, by providing a weir at the discharge port of the extrusion supply device, it is possible to regulate the arrangement of reinforcing fibers to some extent and to provide fibers with excellent strength. Although it has the advantage of forming a reinforced cement plate, the extrusion feeder has a considerably more complicated structure than the flow box, and the cement hardens over time, so maintenance and inspection is indispensable, and the cost and maintenance of the entire equipment increases and is maintained. There was a disadvantage that management became troublesome.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a simple and simple method of supplying a cement slurry in the above-mentioned wet process for producing a fiber reinforced cement board without being affected by the water concentration. An object of the present invention is to provide a cement slurry supply device that can be realized by the device.

[0006]

That is, in the cement slurry supply apparatus in the wet method of the present invention, the height of the raw material supply port 2 of the cement slurry S is made lower than the height of the discharge port 3 of the cement slurry S, and The flow path 4 of the cement slurry S from the supply port 2 to the discharge port 3 has a dovetail shape that spreads flattening toward the discharge port 3, and a supply tank 2A for the cement slurry S is connected to the raw material supply port 2, The discharge port 3 is formed so as to face a forming start point 5A of the forming and dewatering belt 5,

Another aspect of the present invention is characterized in that a brush roll 4 for combing the cement slurry in the discharge direction is rotatably supported at the discharge port 3 in the cement slurry supply apparatus 1 in the wet method. Is what you do.

[0008]

Next, an embodiment of the present invention will be described. 1 is a side sectional view of an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a side sectional view of another embodiment, FIG. 4 is a front view of another embodiment, and FIG. It is a sectional side view of other examples.

In the cement slurry supply apparatus 1 in the wet method of the present invention, the height h ₁ of the raw material supply port 2 of the cement slurry S is set to the height h ₂ of the discharge port 3 of the cement slurry S.
As shown in FIG. 2, the flow path 4 of the cement slurry S from the raw material supply port 2 to the discharge port 3 has a dovetail shape that spreads flatter toward the discharge port 3. The slurry supply tank 2A is connected, and the discharge port 3 is configured to face the forming start point 5A of the forming and dewatering belt 5.

In the above embodiment, it is desirable that the position of the supply tank 2A for the cement slurry be located at a position higher than the height of the discharge port 3. Further, depending on the concentration of the cement slurry S, the supply pump P Is inserted.

In addition, as shown in FIG. 3, the cement slurry supply device 1 in the wet method has a rotatable brush roll 6 made of a wire brush or the like for combing the cement slurry S into the discharge port 3 in the discharge direction. It can also be supported.

In addition to the above, as shown in FIG. 4, a partition plate 3A... 3A for rectifying the cement slurry S is provided at the discharge port 3, or a central band 4A of a dovetail-shaped path 4 from the supply port 2 to the discharge port 3. Alternatively, a diversion projection 4B for dispersing the cement slurry S in the width direction may be provided. In the above description, the partitioning plates 3A are configured by combining thin steel plates in a lattice shape, and the intervals between the partitioning plates 3A are adjusted according to the solid content concentration of the cement slurry.

[0013]

The cement slurry supply apparatus 1 in the wet method according to the present invention has the supply port 2 lower than the discharge port 3 as shown in FIG. It is arranged in an inclined position. Accordingly, the cement slurry S is diffused at a uniform density throughout the dovetail-shaped path 4 by its own weight in the dovetail-shaped path 4 and flows out of the discharge port 3 in that state. Further, since the cement slurry S is supplied while being pressed by the cement slurry S which is forcibly supplied from below, the state tends to be in a laminar flow, and the cement slurry S is discharged from the nozzle discharge port 3 in a more uniform density state.

When the solid content of the cement slurry is low with respect to the water content, the cement slurry flows naturally from the bottom of the cement slurry tank 2A located at a position higher than the discharge port 3.
When the solid content concentration is high, it is supplied by being urged by the pump P.

When a brush roll 6 is provided at the discharge port 3 of the dovetail-shaped path 4, the cement slurry S is flattened in the discharge direction by the rotation of the brush roll 6, and
The orientation can be imparted to the contained fibers, which contributes to the improvement of the strength of the plate-like body.

When the partitioning plate 3A is provided at the discharge port 3 as shown in FIG. 3, the cement slurry S is made to flow uniformly in the width direction at the time of discharge, so that the tissue is made uniform. When the diversion protrusion 4B is provided as shown in FIG. 4, the cement slurry S sufficiently spreads to the end portion of the dovetail-shaped path 4 in the diffusion direction, and particularly when the solid concentration of the cement slurry is high or This contributes to uniform plate making density when the flow speed is high.

[0017]

As described above, according to the present invention, when the cement slurry S is supplied onto the dewatering molding belt, the cement slurry is moved in the width direction by using both the pressure for pushing up from below and the gravity acting on the cement slurry. Since the cement slurry is supplied from the discharge port 3 while being diffused, it is possible to supply the cement slurry diffused widely and in layers, regardless of the level of the solid concentration of the cement slurry. Further, the cement slurry supply device 1 of the present invention has various effects such as being very simple in structure, being provided at a low cost, being easily maintained and managed, and being easily implemented.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a side sectional view of another embodiment.

FIG. 4 is a plan sectional view of still another embodiment.

FIG. 5 is a side sectional view of still another embodiment.

FIG. 6 is a side view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cement slurry supply apparatus in a wet method S ... Cement slurry 2 ... Material supply port 2A ... Cement slurry supply tank 3 ... Discharge port 3A ... Partition partition plate 4 ... Flow path 4A ... Central zone of flow path 4B ... Diversion projection 5 … Molding dewatering belt 5A… Molding starting point 6… Brush roll

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B28B 13/02 B28B 1/52

Claims (2)

(57) [Claims] 1. The height h ₁ of the raw material supply port 2 of the cement slurry S is made lower than the height h _{2 of the} discharge port 3 of the cement slurry S, and the cement slurry S reaching the discharge port 3 from the raw material supply port 2. Of the cement slurry S is connected to the raw material supply port 2, and a supply tank 2 </ b> A of the cement slurry S is connected to the raw material supply port 2.
Is a cement slurry supply device in a wet method, which is located at a forming start point 5A of the forming and dewatering belt 5. 2. A cement slurry supply apparatus according to claim 1, wherein a brush roll for combing the cement slurry S in the discharge direction is rotatably supported at the discharge port 3.