JPH0341817Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The invention is applicable to the ceilings and interiors of soaking furnaces that heat steel ingots prior to blooming, heating furnaces that heat metal slabs prior to rolling, etc. The present invention relates to a fireproof spraying device for obtaining parts such as side walls that must be made of fireproofing material by spraying the fireproofing material.

BACKGROUND ART Conventionally, as shown in FIG. 3, in this type of fireproofing material spraying apparatus, air 83 is fed under pressure from a tank 81 storing dry fireproofing material into a hose 82. It was supplied to a spray nozzle 84 at the tip, and water 85 was added to the dry spray material near the nozzle.

Problems to be solved The problem with this kind of spray construction is how to prevent cracks, peeling, and falling off of the spray-applied fireproofing material due to drying and shrinkage during use. The question is whether to do so.

In order to prevent such cracking and peeling and falling, it is best to add 7 to 8% water and distribute it uniformly throughout the dry sprayed material. It is difficult to spray with conventional spraying equipment because the kneaded refractory material has poor fluidity.

In addition, for example, in the case of complete repair of the heating furnace or soaking furnace, 200 to 300 tons of refractory material is required, and in the case of partial repair, 50 to 100 tons are required. The height reached 300-400mm. When a large amount of refractory material is used in fireproofing construction, the amount of refractory material discharged by the spraying equipment is set at approximately 80 to 100 kg/min to save construction time, and the pressure applied to the spraying pressure (in other words, In order to increase the strength (for example, after construction), the nozzle discharge pressure was increased to 8 to 10 kg/cm ² . This applies to normal spraying construction, but especially when the amount of refractory material discharged from the spray nozzle is large and the discharge pressure is high, dry fireproofing spraying in which additive water is sent Since it is difficult to distribute uniformly in the material, more water than necessary (13 to 15% in conventional examples) had to be added in order to prevent dust generation and provide adhesion.

However, as a result, less dust is generated and it adheres to the surface to be sprayed, but if water penetrates into the sprayed material, the sprayed material will flow, and if the surface to be sprayed is a ceiling, there will be no dust.
It was not possible to spray to a thickness of 200 to 400 mm at a time. Even where the sprayed material adhered, when it dried, cracks were likely to occur due to shrinkage during use, and the phenomenon of peeling and falling was likely to occur.

In order to solve the above-mentioned problems, the purpose of the present invention is to provide a fireproofing material spraying device that can smoothly spray a mixture of an appropriate amount of water and fireproofing material mixed in a desired state in advance. be.

Means for Solving the Problems The above object of the present invention is to provide a kneading supply device that mixes an appropriate amount of water and dry fireproof spray material for forming a fireproof material layer and supplies it to the necessary locations, and an upper part that can be opened and closed. A pressurized tank is provided with a material receiving port for receiving material from the kneading and feeding device, and a material discharging port at the bottom thereof, and a compressed gas supply port to increase the pressure inside the tank; a material transport pipe connected to a material discharge port, equipped with a compressed gas supply port for material transport at a position close to the discharge port and equipped with a material spray nozzle at its tip; and a material quantitative delivery pipe provided in the pressurized tank. The material quantitatively dispensing device includes a vertically oriented cylinder that is driven and rotates to receive the material supplied from the material receiving port of the tank, a fixed table that closes a lower end opening of the cylinder, and an inner bottom portion of the cylinder. and a blade plate facing the gap from an opening formed in the fixed table, and the material falling from the fixed table opening is guided to the tank outlet. This is achieved by a refractory spraying device designed to

According to the present invention, the sprayed fireproofing material, which has been kneaded with an appropriate amount of water in advance, is put into a rotating cylinder of the material quantitative delivery device in the pressurized tank, and is rotated and moved by the feed blade at the bottom of the cylinder. A fixed amount is fed out from the opening of the fixed table as it is cut by the blade plate, and reaches the material conveying pipe from the tank outlet, where the gas is fed under pressure and is discharged from the spray nozzle.

The refractory material spraying apparatus of the present invention can be used not only for spraying refractory materials mixed with water in advance, but also for spraying refractory spray materials containing a binder.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 2, the refractory material spraying device includes a kneading supply device having a stirring device 4 and a conveyor 6, a pressurizing tank 1, a material conveying pipe 2, and a quantitative delivery device 3 (see FIG. 1). ).

As shown in detail in FIG. 1, the pressurized tank 1 includes:
Material receiving port 12 with opening/closing device 11 attached to the upper part
are each provided with a material discharge port 13 at the bottom thereof, and are provided with a compressed air supply port 14 in the form of a pipe so that the internal pressure can be increased. The opening/closing device 11 is of a type already known per se and has a hole 11 that pivots about a center line 11' and communicates with a material receiving hopper 111.
2 can face the mouth 12, or the mouth 12 can be closed.

The material conveyance pipe 2 includes a fixed L-shaped pipe section 21 connected to the tank outlet 13 and a flexible hose 2 following the fixed L-shaped pipe section 21.
2, and the L-shaped tube part 21 has a compressed air supply port 2.
3 is provided, and a nozzle 24 is provided at the tip of the hose 22.
is connected.

The material quantitative delivery device 3 is installed in the pressurized tank 1, and includes a driven rotating vertical cylinder 31 arranged at a position to receive the material falling from the material receiving port 12 of the tank 1, and a lower end opening of the cylinder. a fixed table 32 for closing the cylinder, two sending blades 34 in the radial direction of the cylinder provided at the inner bottom of the cylinder with a gap 33 from the fixed table, and the fixed table 32.
A blade plate 35 is provided which projects from the cylindrical radial opening 321 into the gap 33.

The cylinder 31 has a flange-shaped gear 31 on its outer periphery.
1, and this gear is supported by roller 312 type supports 313 at three points at 120° intervals, making it completely rotatable.
The gear 311 is driven by a motor 316 via a gear transmission 314 including a pinion meshing with the gear 311 and a reduction gear 315.

At the center of the bottom of the cylinder 31 (in the case shown, between two sending blades), there is a protrusion (a cylindrical body, which is a cone in the case shown), which uses the feeding blade 34 as a support arm to prevent material from accumulating. etc.) 36 are provided.

The blade plate 35 is detachably supported by a block 351 on the lower surface of the fixed table 32, and the amount of protrusion into the gap 33 is adjusted by a screw mechanism 352.

Further, the opening amount of the fixed table opening 321 can be adjusted by a plate 322 swingably attached to the lower surface of the table.

The opening 321 is connected to the tank outlet 13 by a guide chute 15 .

Therefore, compressed air supply sources are connected to the compressed air supply ports 14 and 23 of the tank 1 and the material transfer pipe 2, respectively, and on the other hand, as shown in FIG. The kneaded refractory material 5 obtained by kneading with an appropriate amount of water and aging is introduced into the pressurized tank 1 by the conveyor 6, and is allowed to fall directly into the cylinder 31 of the material quantitative delivery device 3,
After that, the opening/closing device 11 of the receiving port 12 of the tank 1
Closed at. Next, the pressure inside the tank 1 is increased, the cylinder 31 is rotated, and compressed air is supplied into the material transport pipe 2 from the mouth 23 . Then, the kneaded refractory material is rotationally moved by the feed vane 34 at the bottom of the tank, and is continuously cut out in a predetermined amount by the blade plate 35, smoothly passing from the fixed table opening 321 into the pipe 2 through the guide chute 15. Fall. From here, it is fed under pressure by compressed air, travels through the hose 22 to the spray nozzle 24, and is smoothly sprayed from the nozzle onto the surface 7 to be sprayed.

Since the sprayed kneaded refractory material has been aged by uniformly adding an appropriate amount of water in advance, it will not crack or peel off due to shrinkage during drying and use.

Incidentally, it is also possible to spray the refractory powder granules containing a binder using the apparatus of the above embodiment.

Effects of the Invention As described above, according to the present invention, there is provided a fireproof material spraying device that can smoothly spray a fireproof spraying material that has been kneaded with an appropriate amount of water and matured in advance, or a fireproof spraying material containing a binder. It has the advantage of being able to provide In other words, a kneading supply device was installed upstream of the pressurized tank to knead an appropriate amount of water and dry refractory material to form a refractory material layer and supply it to the necessary locations. Can be kneaded. In addition, the material quantitative delivery device in the pressurized tank closes the lower end of a vertically oriented cylinder that receives the material with a fixed table, and moves the material with a feed blade that rotates together with the vertically oriented cylinder. Since the blade plate facing the opening causes the kneaded material to fall and send it to the material transport pipe, even if the kneaded material has increased viscosity compared to the dry state, it can be reliably delivered in a fixed amount by utilizing the weight of the kneaded material. Furthermore, since the kneaded material sent out in this way is discharged from the nozzle using compressed gas through the material transport pipe, a certain amount of material sufficiently kneaded with water can be reliably sprayed onto the required location.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of an embodiment of the present invention, FIG. 2 is an overall schematic diagram of an embodiment of the invention, and FIG. 3 is an overall schematic diagram of an example of a conventional device. 1... Pressurized tank. 11...Switching device, 12...
...Material reception port, 13...Material discharge port, 14...
Compressed gas supply port, 15...Guide chute, 2...
...Material conveyance pipe, 21...Fixed L-shaped pipe section, 22...
Flexible hose, 23... Compressed gas supply port, 24
...Blowing nozzle, 3...Material quantitative delivery device,
31... Vertical cylinder, 32... Fixed table, 3
21...Fixed table opening, 33...Gap, 34
...Feeding blade, 35...Blade plate.

Claims (1)

[Scope of utility model registration request] A kneading supply device which kneads an appropriate amount of water and dry fireproof spray material to form a refractory material layer and supplies the mixture to necessary locations; and a material receiving device equipped with an opening/closing device at the top to receive materials from the kneading and supply device. A pressurized tank is connected to the material outlet of the tank, and is equipped with a material outlet at the bottom and a compressed gas supply port to increase the internal pressure. A material transport pipe is provided with a compressed gas supply port for transport and has a material spray nozzle at its tip, and a material quantitative delivery device provided in the pressurized tank, the material quantitative delivery device being a vertically oriented cylinder that is driven and rotates to receive material supplied from a material receiving port, a fixed table that closes a lower end opening of the cylinder, and a feed blade provided at the inner bottom of the cylinder with a gap relative to the fixed table; A fireproof spraying device comprising: a blade plate facing the gap from an opening formed in the fixed table, and material falling from the fixed table opening is guided to the tank outlet.