JPS6018892Y2 - Continuous molding equipment - Google Patents

Description

[Detailed description of the invention] This invention relates to a device that continuously forms plate-like materials from slurry-like raw materials, and in particular, mixes gypsum with asbestos, calcium silicate, etc., and adds several times as much water to the mixed raw materials. In addition, the present invention relates to a continuous forming apparatus suitable for pressurizing and dehydrating a slurry to form a gypsum board.

Gypsum board, a building material made from gypsum, is used as a fire-resistant building material.In particular, in steel frame buildings, when the steel frame is exposed to fire heat, its strength decreases and its durability is low, so gypsum board is used around the steel frame. A method has been adopted in which the fire resistance is strengthened by arranging plasterboards, and in this case, the fire resistance is particularly improved if a thick plaster board is used.

When forming the above-mentioned thick gypsum board, gypsum alone has low strength despite its large weight, so asbestos is mixed in to improve the strength, and lightweight calcium silicate is mixed in to reduce the weight. The above calcium silicate is easily destroyed by mechanical shearing, causing a significant reduction in the strength of the product. Therefore, sufficient water is added to prevent the calcium silicate from being destroyed, and the mixture is mixed in a slurry form, and then pressurized. A so-called slurry molding method is employed as a preferred method for producing thick gypsum boards.

However, until now, no technology has been developed to continuously pressure-form the slurry-like raw materials, so a batch-type pressing method has been adopted in which the slurry-like raw materials are poured into a mold and then pressed to dehydrate them under pressure. However, there is a disadvantage in that it causes a lot of time loss and poor productivity, and as mentioned above, it is not easy to change the dimensions of the molded product using a mold.

This idea was made in view of the above-mentioned drawbacks, and the purpose is to provide a continuous molding device that can manufacture plate-shaped plates by continuously pressurizing and dehydrating slurry-like raw materials, and can easily change the dimensions of molded products. The purpose is to

Specifically, the continuous molding device according to this invention connects a metering pump to the lower end outlet of a hopper that supplies mixed raw materials in the form of slurry, and also arranges a guide tube that communicates with the discharge port of the metering pump. The mixed raw material is continuously forced into the guide tube in fixed amounts at a constant pressure, and is continuously circulated downstream through an endless filtration net that is vertically opposed to the outlet of the guide tube. At the same time, a continuous pressure dehydration molding machine with continuous side seal plates attached to the guide tube is placed on both sides between the upper and lower filtration nets, and the slurry raw material sent out from the outlet of the guide tube is It is press-fitted into a closed dehydration chamber with a rectangular cross section surrounded by upper and lower filtration nets and left and right side seal plates, and the material contacting surfaces of the upper and lower filtration nets are pressed by press rollers to separate the upstream part from the downstream part. The compressed dewatering zone is arranged in a tapered manner so that the spacing becomes narrower towards the end, while the downstream part is arranged at regular intervals corresponding to the thickness of the molded product to form the molding zone. This is a characteristic feature.

This invention will be explained in detail below with reference to embodiments shown in the drawings.

1 is a hopper as a raw material supply device into which slurry raw materials are continuously fed, and gypsum, asbestos, calcium silicate,
A large amount of water is added to a mixture of additives and additives for adjusting curing time at a predetermined mixing ratio to form a slurry, and a thick gypsum board forming raw material is charged.

Reference numeral 2 denotes two slurry pumps connected in parallel to the lower end outlet 1a of the hopper 1, and the outlet 2a is bent 90 degrees to face sideways.

As the slurry pump, a constant displacement continuous pump such as a Mono pump is used.

Reference numeral 3 designates a horizontal wide-angle guide cylinder connected to the discharge ports 2a of the two slurry pumps 2.

Reference numeral 10 denotes a continuous pressure dehydrator disposed downstream of the guide tube 3, which is connected to the raw material extrusion port 3a of the guide tube 3, and has endless filtration nets 4 and 5 arranged vertically facing each other.

The filter nets 4 and 5 are provided with a pair of rollers 6 and 7 arranged in front and rear, respectively.
.
The aw5a is rotated toward the downstream side.

The pair of front and rear filtration mesh wrapping rollers 6, 7, 8, and 9 each include an upstream rear roller 7.9 and a front roller 6.9, respectively.
8, and are located at upper and lower positions on the slightly upstream side of the extrusion port 3a of the guide tube 3, so that the slurry raw material extruded from the extrusion port 3a is filtered between the filter nets 4a and 5a. so that it can be easily pushed into the

Further, a plurality of presser rolls 11 and 12 are installed between the rollers 6, 7, 8, and 9 along the transfer direction so as to press the raw material contact surfaces 4a and 5a of the filter net from the back side, respectively. The upstream roll 11aw among the rear presser rolls 11.12
12a are arranged so that the interval becomes gradually narrower toward the downstream side, so that the portion sandwiched between the raw material contact surfaces 4a and 5a of the filter net forms a compression zone 4 with a tapered cross section, and the downstream roll llb and 12b are arranged at the same interval,
A molding zone 4 is formed in which the portion of the filter net sandwiched between the raw material contact surfaces 4a and 5a has a protrusion approximately the same as the thickness of the molded product.

Reference numeral 16 denotes a side seal plate that seals the left and right sides between the raw material contact surfaces 4a and 5a of the filter net, which is formed integrally with the guide tube 3 and extends from the side of the extrusion port 3a.

A seal (not shown) is also applied to the contact area between the extrusion port 3a of the guide cylinder and the raw material contact surfaces 4a and 5a of the filter net to prevent the slurry raw material from leaking due to internal pressure.

Reference numeral 13 denotes a pressure sensor installed near the raw material extrusion port 3a in the guide cylinder 3, and the pressure sensor 13 is connected to a control device 14, and the control device 14 is connected to a motor 15 that operates the slurry pump 2. Pressure sensor 13
According to the pressure detected by the pump, the rotation speed of the pump is controlled so that the pressure is constant.

Next, the operation of continuously forming a molded plate from a slurry raw material using the above-mentioned apparatus will be explained.

First, a dummy par (not shown) having the same size as the molding piece is inserted into the molding zone 4 between the filter nets 4 and 5 from the downstream side, so as to close the downstream opening of the compression zone B.

Next, a predetermined amount of weighed slurry raw material is continuously supplied to the raw material supply hopper 1, and the slurry pump 2 passes through the guide tube 3 in fixed amounts at a time to the raw material contact surfaces 4a, 5 of the filtration net.
It is press-fitted into a flat rectangular dehydration chamber surrounded by a and side seal plates 16 on both sides.

The pressure of this slurry raw material to be press-fitted is determined by pressure sensor 1.
3 and controlled by the control device 14 to maintain it constant.

The amount of raw material supplied to the dehydration chamber is the sum of the weight of the predetermined molded product and the water to be dehydrated from the filter nets 4 and 5.

The slurry raw material supplied to the dehydration chamber is passed through the upper and lower filtration nets 4
, 5, and is transferred toward the downstream side at a predetermined speed.

At that time, first, in the compression zone B, in a completely sealed space closed with a dummy par, the slurry raw material is gradually pressurized between the filter nets 4 and 5 with a tapered cross section, so that the raw material does not escape from the room and is Filtering net 4a.

Only water is released from 5a to reduce the volume.

The compressed and dehydrated raw material gradually solidifies, and when the dummy par is pulled out after solidification, the raw material is transferred to the molding zone 4, where it is solidified and molded to a predetermined thickness,
It becomes a continuous plate 20 and is discharged from the filter nets 4 and 5.

The discharged molded plate 20 is cut into a desired length by a cutting device (not shown).

Note that this invention is not limited to the above embodiment, and the filter nets 4, 5
Capital belts may be placed one on top of the other on the inside of the cylinder to ensure compression, and presser rolls 11 and 12 may be attached to the actuating rod of the cylinder so that their installation position can be adjusted. The compression ratio of the slurry raw material and the thickness of the molded product can be easily changed.

Further, a presser plate may be used in place of the presser rolls 11, 12.

As shown in FIG. 3, the slurry raw material supply device includes a hopper 21 attached to a frame 25 via an elastic body 26, and a vibrator provided on the outer wall of the hopper 21 via ribs 31. A pump stator 24 is inserted between a vibration generator 22 and a discharge casing 30 connected to the hopper bottom and the guide tube 3, and a rod 29 that passes through the hopper 21 and the pump stator 24 and whose upper end is a drive motor 27. A pump rotor 23 is connected to the pump rotor 23 via a universal coupling 28 as a joint, and the slurry raw material is passed from the hopper along the threads of the stator 24 and is discharged into the discharge casing 30 by the meandering rotational movement of the rotor 23. so that it is discharged from

At this time, the vibration generator 22 vibrates to apply an impact intermittently to the hopper in order to give vertical vibrations consisting of downward acceleration and upward acceleration to the hopper. The slurry is moved to the bottom of the hopper by a downward inertial force that overcomes the force of the slurry. Therefore, especially in the case of gypsum slurry, etc., which has hardness, it is possible for the slurry to adhere and harden in the hopper, causing blockage of the flow path. It will be possible to prevent this from happening.

In addition, a guide tube 3 into which slurry raw material is injected into the molding machine 10
If hardening of the raw material is a problem even at the opening of the guide tube, the problem of hardening of the slurry can be solved by installing a vibration generator such as a vibrator in the middle of the guide tube to apply vibrations. Of course.

In addition, the above embodiment is used for a method of forming a gypsum board by the so-called slurry method, in which the raw material is slurried by adding several times as much water to a mixture of gypsum, etc., and is continuously dehydrated under pressure.
It is also suitably used when a gypsum board manufacturing method is used, in which a small amount of water necessary for the molded product is added in advance to a mixture of gypsum, etc., and then compression molded. It is preferable to send the added mixed raw materials between the press belts (filtering nets) using a pump.

In addition to the above-mentioned gypsum board, it is also suitably used when molding a molded product by pressurizing and dehydrating a slurry raw material.

As is clear from the above description, according to the continuous molding apparatus according to the present invention, pressure dehydration molding can be performed continuously from a slurry raw material, so that molded plates with stable quality can be efficiently produced.

Furthermore, since the molded plate is a continuous body, there is no limit to its length, and molded products of any length can be obtained with a high yield by cutting it to any length.

Furthermore, the thickness of the molded product can be easily changed by simply adjusting the interval between the filter nets disposed one above the other, and the product dimensions can be easily changed.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of a continuous molding apparatus according to this invention, FIG. 2 is a cross-sectional view taken along the line ■--■ in FIG. 1, and FIG. 3 is a partial cross-sectional view of the raw material supply device. 1... Hopper 2... Slurry pump, 3... Guide cylinder, 4, 5... Filtration net, 10... Continuous pressurization Dehydration molding machine, 11, 12・
... Presser roll, 13 ... Pressure sensor 16 ... Side seal plate, 4 ... Compression zone, 4. Bend/bottom shape zone.

Claims (1)

[Scope of utility model registration request] A metering pump is connected to the outlet at the lower end of the hopper that supplies mixed raw materials in the form of slurry, and a guide tube that communicates with the discharge port of the metering pump is arranged. It is forcibly fed in at a constant pressure, and an endless filtration net is disposed so as to be circulated toward the downstream side in a continuous manner vertically opposite to the outlet of the guide cylinder, and between the upper and lower filtration nets. A continuous pressure dehydration molding machine with continuous side seal plates attached to the guide cylinder is installed on both sides of the machine, and the slurry raw material sent out from the outlet of the guide cylinder is surrounded by the upper and lower filtration nets and the left and right side seal plates. The raw material contact surfaces of the upper and lower filtration nets are pressed by press rollers so that the upstream portion is directed toward the downstream side and the interval becomes narrower. A continuous molding device characterized in that the continuous molding device is arranged in a tapered shape to form a compression dehydration zone, while the downstream region is arranged at regular intervals corresponding to the thickness of the molded product to form a molding zone.