JP2929121B2 - Continuous forming equipment for calcium silicate plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an apparatus for continuously forming calcium silicate plates.

<Conventional Technology> In recent years, calcium silicate boards have attracted attention as an alternative to cement boards as exterior wall materials for buildings, taking advantage of the features of light weight and high strength.

In the production of a calcium silicate plate, a water slurry obtained by adding a large amount of water to calcium silicate to which a filler and a reinforcing material are added is used. Water is also contained in calcium silicate crystal particles.

However, in order to obtain a high-strength calcium silicate plate, a dehydration treatment for separating water from the slurry must be performed.

Therefore, conventionally, a calcium silicate plate is formed in a batch system by supplying a water slurry of calcium silicate in a frame of a compressor and compressing the slurry at a high pressure for a certain time or more. .

<Problems to be Solved by the Invention> However, in such a batch-type method using a conventional compressor, labor is required each time for operations such as starting operation and taking out a plate, and during that time, production is difficult. Since the operation is interrupted, the production efficiency is low, which has a problem that the production cost of the calcium silicate plate is adversely affected.

The present invention has been made in view of the above problems, and has as its object to provide an apparatus for continuously forming a calcium silicate plate with good productivity.

<Means for Solving the Problems> In order to achieve the above object, the present invention provides a caterpillar constituted by a compression plate continuously oscillating on the same rotation orbit, provided vertically facing each other. A vacuum for supporting the bearings of the rollers at least at both ends of at least one of the caterpillars by a pressure applying device composed of a fluid pressure cylinder, and sucking water via a liquid-permeable transport belt in front of the pair of upper and lower caterpillars. By providing a dehydrating device, a continuous forming device for a calcium silicate plate is constituted.

Further, it is preferable that one of the upper and lower caterpillars is provided with a protruding plate protruding toward the other compression plate at both ends thereof to form a recess, and the other compression plate is fitted into the recess.

<Operation> According to the above configuration, the above operation is produced.

The calcium silicate water slurry is compressed to form a calcium silicate plate. In this apparatus, the calcium silicate plate is compressed while being moved while being moved between a pair of caterpillar compression plates provided vertically facing each other. A calcium acid plate is continuously formed.

In addition, since the bearings of the rollers at least at both ends of at least one of the caterpillars are supported by pressure applying devices each composed of a hydraulic cylinder, the degree of pressure application can be separately adjusted,
Thus, the same compression pressure can be obtained over the entire compression surface.

At the time of compression molding by the above-mentioned caterpillar, it is desirable that the water slurry is previously dehydrated to such an extent that it can maintain its original shape. Therefore, while being conveyed by a liquid-permeable conveyance belt, the water slurry is conveyed by a vacuum dewatering device. Water is sucked through the belt to dehydrate. After that, the same operation as described above is obtained by the caterpillar.

Also, when performing compression molding between the compression plates of the caterpillar,
One of the compression plates is provided with protrusions at both ends to form a recess, and the other is fitted into the recess, and both sides of the calcium silicate plate are protected by the protrusions to prevent crushing of the calcium silicate plate. I do.

<Examples> Hereinafter, examples according to the present invention will be described with reference to the drawings, but the present invention is not limited to the following examples as long as the gist is not exceeded.

 Referring to FIG. 1, a system according to one embodiment will be described.

 First, an outline of the present apparatus will be described.

A water slurry of the raw material calcium silicate prepared by a method described later is introduced into the supply unit 1.

A vacuum dewatering device 2 with a conveyor belt 13 for removing water from the slurry is disposed below the supply unit 1. The caterpillars 3 and 4 are sandwiched between the base ends thereof with a predetermined gap described later.

Both ends of the upper caterpillar 3 are suspended by pressure applying devices 5 and 6, respectively.
Is provided with a cutter 7 for cutting a continuous plate-shaped calcium silicate plate into a predetermined length, and an autoclave for heating the cut plate under pressure to obtain higher strength. 8 are provided.

Here, a method for preparing a calcium silicate water slurry will be described.

Water 1000 per 100 parts by weight of calcium silicate hydrate
Up to 4000 parts by weight, glass fiber, carbon fiber, etc.
0 parts by weight, if necessary reinforcing material such as known latex 0.5
~ 10 parts by weight are added and stirred with a well-known stirring and mixing device.
Mixed. Powdered calcium silicate hydrate may be used, or an aqueous slurry of calcium silicate hydrate reacted with lime and silicic acid may be used. Preferably, a water slurry is used.

Next, the vacuum dehydrating apparatus 2, the upper and lower pair of caterpillars 3, 4 and the pressure applying apparatuses 5, 6 which are main parts of the present apparatus will be described in detail.

The vacuum dewatering device 2 includes a U-shaped frame 11 to which the slurry is supplied from the supply unit 1 and whose opening direction is open, and one or a plurality of compression rolls provided on the upper side of the frame 11 for compressing the slurry. 12, a conveyor belt 13 forming a bottom surface of the frame 11, rollers 14 and 15 around which the conveyor belt 13 is wound and driven to rotate by a driving device (not shown), and a belt 1 on the bottom surface of the frame 11 from below.
Decompression chamber formed by a cover 16a arranged around 3
Consists of 16.

The decompression chamber 16 is provided via a filtrate tank or the like (not shown).
A decompression generator (not shown) such as a vacuum pump is connected by a pipe.

Further, as the transport belt 13, a metal net having liquid permeability, a net made of a synthetic resin or the like, or a metal net preferably coated with a fluororesin having good releasability is used.

The lower caterpillar 4 includes a compression plate 23 attached to a belt or a wire (not shown) wound around rollers 21 and 22 that are driven to rotate by a driving device (not shown);
The guide rails 24 support the guide plates 21 and 22 and prevent the compression plate 23 from bending.

The upper caterpillar 3 has the same configuration as the lower caterpillar 4, including rollers 31, 32, a belt or a wire, a compression plate 33, and a guide rail 34, and a hydraulic cylinder as shown in FIG. Two interlocking pressure applying devices 5, 6 such as pneumatic cylinders are respectively mounted.

That is, to explain the pressure applying device 5, the output shaft 36 of the cylinder 5 is fixed to the casing of the bearing 37, and the rotating shaft 38 of the roller 31 is supported by the inner ring of the bearing 37.

With such pressure applying devices 5 and 6, both ends of the upper caterpillar 3 are suspended so as to be vertically movable separately.

In addition, depending on the length of the caterpillars 3 and 4, the pressure applying device
Between 5 and 6, it is necessary to further install a pressure applying device to press the guide rail 34 downward.

Here, the shape of the compression plates 23, 33 will be described. As shown in FIG. 3, the compression plates 23, 33 can be freely rotated along the rollers 21, 22 and 31, 32, as shown in FIG. The length A is divided every 100 to 300 mm, and has a substantially rectangular shape.

Note that the length A in the traveling direction is determined by the size of the caterpillar.

In addition, the friction surface between the compression plate 23 and the guide rail 24 and the friction surface between the compression plate 33 and the guide rail 34,
It is preferable to provide a resin portion such as polyethylene for improving the slip.

Further, at the position where the outlet (right side in the figure) of the vacuum dewatering device 2 is sandwiched between the base ends of the upper and lower caterpillars 3 and 4, the interval between the compression plates 23 and 33 of the upper and lower caterpillars 3 and 4, The pressure applying device 5 on the base end side (vacuum dehydrator side) of the upper caterpillar 3 is designed so that the difference from the plate thickness at the outlet, that is, the gap does not become 20% or less, preferably 10% or less of the plate thickness. Further, a stopper bar 40 is provided which is prevented from descending by a stopper 39.

Furthermore, on the surfaces of the compression plates 23, 33 of the upper and lower caterpillars 3, 4,
A mesh-like or cloth-like belt 25 that moves at the same speed as the compression plates 23 and 33 is provided.

The belt 25 is, as shown in FIG.
At 1,22,31,32, they may be driven together or may be driven by another roller.

When driven by another roller, the rotation path of the belt 25 may be extended to both sides of the caterpillars 3 and 4 to form the introduction path and the extraction path of the calcium silicate plate.

Note that the belt 25 may be installed only on the lower track 4 side.

Further, the belt 25 may be of the same quality as the transport belt 13 used in the vacuum dehydrator 2.

In use, the slurry of the plate material is supplied from the supply unit 1 into the frame 11 on the belt 13.

The slurry spreads in the frame 11, and the water in the slurry is
It is sucked into the decompression chamber 16 below the conveyor belt 13 and removed,
It will be able to maintain its own shape.

During this time, the slurry is transported forward by the rotational movement of the belt 13, and is compressed by the compression roller 12, thereby crushing the voids in the slurry generated by the dewatering and further improving the dewatering property.

In this way, the calcium silicate in a substantially plate shape is inserted between the compression plates 23 and 33 of the upper and lower caterpillars 3 and 4, and the weight of the upper caterpillar 3 and the pressure adjusted by the pressure applying devices 5 and 6 are adjusted. Thus, compression molding is performed.

At this time, the thickness of the calcium silicate plate decreases as it moves forward. For example, in order to uniformly compress the whole with a pressure of 1 to ²⁰ kg / cm ² , the upper caterpillar 3
Must be lowered from the base end side of the base.

In this way, the calcium silicate plate can be formed continuously, so that compared to the conventional batch-type method, no labor is required for starting operation and removing the plate, and the work is interrupted during that time. Since there is no need to do this, production efficiency is good and no manpower is added, so there is no occurrence of artificial damage.

In addition, since a gap can be created between the compression plates 23 and 33 and the calcium silicate plate by the belt 25, it is easy to allow water compressed and dewatered between the compression plates 23 and 33 to escape to both sides. Become.

As another embodiment, another shape of the compression plate will be described with reference to FIG.

The compression plate 41 of the lower caterpillar 4 is provided with protruding pieces 43 protruding toward the compression plate 42 side of the upper caterpillar 3 at both ends thereof.
Form 44.

Then, the compression plate 42 is fitted into the recess 44.

Conversely, the protruding piece may be provided on the compression plate side of the upper track 3, and the compression plate of the lower track 4 may be fitted into the recess.

In this case, the same function and effect can be obtained, and the calcium silicate plate is protected from both sides during compression molding, so that the calcium silicate plate can be prevented from being crushed.

 Next, an experimental example in comparison with the related art will be described.

First, a method of preparing a calcium silicate water slurry used in the comparative experiment will be described.

Warm water is added to 49.6 parts by weight of quicklime (CaO: 96.2%) to slake to form slaked lime slurry.

50.4 parts by weight of silica stone (SiO ₂ : 96.4%) is added to the slurry.

To this, water is added so that the total amount of water is 27.5 parts by weight based on the solid content.

This slurry is reacted for 4 hours under a steam pressure of 15 kg / cm ² to obtain a calcium silicate hydrate of zonotlite.

To the slurry of calcium silicate hydrate, 7 parts by weight of a carboxyl-modified styrene-butadiene copolymer latex as an extender and carbon fibers (25 mm Long,
3 parts by weight of 3000 filaments) and 0.5 parts by weight of a melamine sulfonate compound (NL-4000 manufactured by Bozoris) are mixed and sufficiently dispersed.

Calcium silicate plates were formed from the calcium silicate aqueous slurry prepared in this manner by using the apparatus of the present invention (continuous type) and the conventional apparatus (batch type).

The device of the present invention The substantial dewatering part of the vacuum dewatering device is 1030 mm in width and length
1500 mm, and the vacuum suction pressure of the vacuum dehydrator is -450 m
mHg.

Two compression rollers having a diameter of 200 mm were attached.

The actual compressed part of the caterpillar is 1030 mm wide and 45 long
00 mm and a surface pressure of 30 kg / cm ² .

 The moving speed of the belt and the compression plate was 3 m / min.

In addition, as the belt for the vacuum dehydrator and the belt on the compression plate of the caterpillar, a mesh belt of the same quality was used.

After compression molding of the calcium silicate plate by the above-mentioned apparatus, this was dried at 120 ° C. for 10 hours.

Conventional equipment The frame of the compressor for injecting the slurry is 1000 mm x 3000 mm, and the surface pressure is set to 30 kg / cm ² . After pressurized dehydration molding by this, it was similarly dried at 120 ° C. for 10 hours.

Table 1 shows the comparison results of the calcium silicate plates formed by these methods.

As shown in Table 1, the conventional apparatus has an average production speed of 1 m ² / min, while the apparatus of the present invention has three times the productivity at a production rate of 3 m ² / min.

Also, in the conventional batch type, five people were always required to start the compressor and take out the plate. However, in the production by the apparatus of the present invention, no manual operation is required, and the abnormality inspection of the apparatus is performed. On patrols for several hours
You only have to look around twice.

In addition, in the molding with the conventional equipment, the plate was manually removed for each batch, so many breaks were seen,
Since molding by the apparatus of the present invention does not require any manual operation, no breakage due to manual operation occurs and the yield is improved.

Further, in the apparatus of the present invention, the moving speed can be further increased by increasing the length of the substantial vacuum dewatering part in the vacuum dewatering device and the length of the substantial compression part in the caterpillar at the same ratio. It is possible, and the productivity can be further improved.

<Effects of the Invention> As described above, according to the present invention, no manual work is required, and accordingly, no manual destruction occurs, and
Since it is continuous, the production is not interrupted for each batch unlike the batch type, so that the production efficiency is good and the cost can be reduced. In particular, by supporting the bearings of the rollers at both ends of the caterpillar by a pressure applying device consisting of a fluid pressure cylinder, it can be continuously pressed by a compression plate, and the thickness of the calcium silicate plate is reduced as it moves forward. The whole can be compressed evenly.

Also, before the caterpillar, by a vacuum dehydrator,
Since the water is sucked through the liquid-permeable transport belt, it is possible to reach the caterpillar in a state where a substantially plate-like shape can be maintained, and the dewatering property and the compressibility are improved.

Further, since one compression plate of the upper and lower caterpillars is provided with a protruding piece protruding toward the other compression plate at both ends thereof to form a recess, and the other compression plate is fitted into the recess, so that compression is performed. In doing so, the calcium silicate plate can be protected and the crush of the calcium silicate plate can be prevented.

[Brief description of the drawings]

1 is a system diagram showing one embodiment of the present invention, FIG. 2 is a partial perspective view of the same, FIG. 3 is a partial perspective view of a compression plate, FIG.
The figure is a partial perspective view of a compression plate showing another embodiment. 2 ... Vacuum dehydrator, 3 ... Upper caterpillar 4 ... Lower caterpillar, 5,6 ... Pressurizing device 11 ... Frame, 12 ... Compression roller, 13 ... Conveyer belt 16 ... Decompression chamber, 23 , 33… compression plate, 25… belt 43… protruding piece, 44… recess

Claims (2)

(57) [Claims] 1. A caterpillar comprising a compression plate which continuously circulates on the same rotating orbit is provided so as to be vertically opposed to each other, and at least one of the caterpillars has a bearing portion of a roller at at least both ends thereof. A continuous calcium silicate plate characterized by having a vacuum dehydrator supported by a pressure applying device composed of a pressure cylinder and provided with a vacuum dehydrator for sucking water via a liquid-permeable transport belt in front of the pair of upper and lower caterpillars. Molding equipment. 2. One of the upper and lower caterpillars is provided with a projecting plate projecting toward the other compressing plate at both ends thereof to form a concave portion, and the other compressing plate is fitted into the concave portion. The apparatus for continuously forming a calcium silicate plate according to claim 1, wherein: