JPS6062367A - Plastic refractory spray nozzle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a plastic refractory spraying unit that is easy to move and install at a construction site and that has all the necessary functions in one package.

(Prior art) Recently, a spraying method for plastic refractories has been developed as a new method for constructing large, unshaped objects. ``Construction Method'' and ``Japanese Unexamined Patent Publication No. 57-1.97061, Glass Refractory Spraying Machine'' are disclosed.

In general, glass refractories are made by mixing several types of refractory raw materials such as refractory aggregate and fireclay, and kneading the mixture with water and a binder, so it has a very high viscosity. If a conventional wet spraying machine was used to spray the cement mixture as it is, the material would adhere to the inside of the discharge hose and clog it, making spraying impossible.

Therefore, in order to make spraying possible, it was necessary to make special improvements to the materials and spraying equipment. That is, the material is prepared in advance into a granular material having an appropriate level of viscosity so that it is suitable for spraying at the construction site. On the other hand, in order to provide the necessary kinetic energy to the material being transferred inside the discharge hose together with compressed air, spray machines are equipped with a relatively long straight section on the discharge hose, and a curved section at the end of the straight section. The portion has a relatively large radius of curvature to lower the flow resistance.

As described above, continuous spraying of plastic refractories has become possible by preparing the material in granular form in advance and using a spraying machine with a unique discharge hose.

However, the material is prepared in the form of granules in advance as described above, but in order to give the material itself an appropriate viscosity, the material particles adhere to each other and aggregate during kneading during material preparation. Some hard spots that grow into small lumps are formed. In addition, if materials are stacked during storage after preparation or during transportation to the construction site, the material particles located at the bottom will receive the load of the material above and stick to each other, resulting in large lumps. .

As is well known, spraying construction involves transporting the material by suspending it in a stream of compressed air that flows at high speed inside a hose, and ejecting it with air from a spray nozzle to construct walls, etc. It is desirable that the material to be transported is in the form of powder, and if it is in the form of large lumps, it cannot be transported within the hose (generally, the maximum particle size when transported by wind is 1 part of the inner diameter of the hose).
/2 or less). Therefore, during material manufacturing and storage,
Coarse lumps that are unavoidably generated during transportation must be crushed before spraying to an appropriate particle size before being fed to the spraying machine.

FIG. 1 shows an outline of the conventional spraying method and equipment for Silastic Refractories. In Figure 1,
1 is a compare hopper, 2 is a vibrating screen, 3 is a vibrator, 4 is a belt conveyor, 5 is a spray machine, 6 is its material input hopper, 7 is a series of pocket groups that are circulated by a rotating shaft 8, 9 is a drive motor , 13 is a near compressor, and IO is a material discharge hose, which has a relatively long straight section 10a that gives momentum to transfer the material discharged with compressed air, and a relatively large curvature that reduces the flow resistance. Curved portion of radius 1. It has Ob. 11 is a spray nozzle, and 12 is a fireproof wall constructed by spraying.

In such conventional examples, in order to reduce the material to a particle size suitable for spraying without breaking it, the material is passed through a vibrating screen 2 with meshes of an appropriate size, and the coarse lumps that pass through this are manually crushed. , I was letting it pass. For this reason, it was very time-consuming and inefficient.

In addition, the particles of 70 Rustic Refractory during spraying are slightly sticky, so if you pour a large amount into the hole 6 of the spraying machine and the material accumulates inside the hole. , so-called arching (cross-linking phenomenon) occurs in the hopper 6 and the material stops falling down, and as a result, the material cut-out device located below the spray machine, i.e. the hop/e- circulation that is successively lowered, I ? 7) Materials will not reach Group 7, making it impossible to supply materials. In order to prevent this, it is necessary to continuously supply a fixed amount of material to the spray machine according to the material cutting (discharge) capacity of the circulation pocket group. The material was received onto the belt 9 ampere 4, and the oirator of the spraying machine operated and stopped the belt conveyor 4 while monitoring the material cutting situation inside the spraying machine and adjusted the amount of material supplied, which was very time-consuming. was hanging. In addition, due to errors in operation or monitoring, the amount of material supplied is too large, causing arching in the hopper of the spraying machine and making it impossible to discharge the material. Shi broke down with
Conventional methods and devices require a great deal of effort and effort, such as the need to clean the inside of the spray machine.

(Purpose of the Invention) The present invention solves the problems of the above-mentioned conventional methods, and aims to crush the coarse lumps in the material for spraying plastic refractories into particles with a particle size suitable for spraying construction or less. In addition to continuously supplying the spray machine in synchronization with the discharge capacity of the spray machine, equipment with necessary functions such as material crushers and spray machines are compactly integrated into a unit, and operation and stop operations are centrally controlled. The present invention provides a plastic refractory spraying unit in which each device automatically starts and stops with a necessary time difference.

Hereinafter, embodiments will be described in detail based on the drawings.

(Example) Fig. 2 shows an embodiment of the present invention, in which the same reference numerals as in Fig. 1 indicate the same parts, 15 is a crusher, 16 is a near compressor 13 A compressed air control device 17 is disposed in the middle of an air pipe that guides compressed air from the air pipe to the spray machine 5.
This is a centralized control panel that distributes drive power to the compressed air control device 16 and controls the operation and shutdown of these devices. These devices are transported on one trolley 18.
The plastic refractory spraying unit is assembled into a compact unit.

As shown in FIG. 3, the crusher 15 has a hot/e-21. An agitator 22 is installed in the middle part of the hopper 21 to prevent arching of the material, and an agitator 22 is installed in the lower end of the Honno'P-21 to crush coarse lumps in the material to below a certain particle size, and to quantify them. A crushing blade 23 that continuously discharges the material, and a scraper blade 23 that scrapes off the material stuck between the crushing blades.
24, an agitator 22, a drive motor 25 for rotating the crushing blade 23, and the like.

The material is initially introduced into the hopper 21 through the coarse screen 26, and is sequentially pushed downward by the rotation of the agitator 22 without forming any shearing. Here, the coarse lumps in the material are crushed by the crushing blade 23 into particles having a predetermined particle size or less, and a constant amount of material corresponding to the rotational speed of the crushing blade 23 is continuously discharged. The amount of material discharged can be adjusted arbitrarily by changing the rotational speed of the crushing blade 23.

In addition, 27 in Figure 2 is a <? - By dividing the inside of 21 into appropriate parts and putting different types of materials into the divided hoppers, each material is simultaneously discharged at a fixed rate and passes through the discharge hose of the spray machine, which will be described later. It is possible to spray the material that has been naturally mixed into a homogeneous material. For example, some material bounces off the wall during spraying, so-called +) bounce, but this can be mixed into the new material at a certain rate and recycled effectively.

The material discharged from the crusher 15 is sequentially transferred by a belt conveyor 4 and is thrown into a hopper 6 of a sprayer 5. The amount of this official material is adjusted to be the same as the discharge amount of the sprayer 5, so that the material hardly forms an arch in the hopper 6, and a circulating blur that gradually forms at the bottom of the hopper 6. , are supplied to group 7.

The pocket supplied with the material moves to the discharge section and is injected from the spray nozzle 11 through the discharge hose IO together with the compressed air blown from the near compressor 13.

Note that the compressed air control device 16 arranged in the air pipe 31 connecting the near compressor 13 and the spray machine 5 is connected to the control valve 3.
2. Consists of a drain separator 33 for collecting and removing moisture and mist contained in the compressed air.

A series of spray operations by each of the devices, including start and stop operations, are automatically and centrally controlled by a central control panel 17. During automatic operation, if the downstream equipment in the flow of material stops for some reason, it will be detected and all power to the upstream equipment will be shut off at the same time, preventing equipment failure or material supply. It is designed to prevent excess and ensure operator safety.

FIG. 4 shows another embodiment of the invention. The embodiment of FIG. 2 uses a belt conveyor 4 to lift the material discharged from the crusher 15 to the hopper 16 of the blaster 5, thereby increasing the overall height of the blasting unit and in particular the height of the crusher 15. The crusher 1 is kept low.
In this embodiment, the material discharged from the crusher 15 is transferred to the chute 3.
The difference is that 5 is used to directly supply the pump 6 of the spraying machine 5. Although this increases the height of the crusher 15, it has the advantage that the floor area occupied by the truck 18 is small and it can be pulled into a narrow construction site.

The following table compares the number of workers required for the spraying work of the glass refractories according to the above two embodiments with that of the conventional example.

Table (Effects of the Invention) As explained above, the present invention has the following effects.

1) As is clear from the table, the number of required workers has been reduced and significant labor savings have become possible.

-2) Since the amount of material supplied can be completely synchronized with the discharge capacity of the spraying machine, there will be no trouble during the work, thus reducing loss time and improving the material spouting condition from the spraying nozzle. It is extremely stable, and as a result, spraying work is easier and the labor of the nozzle man is reduced.

3) The spouting state of the material is stable over a long period of time, and the adhesion of the material to the wall is good.The performance of the constructed fireproof wall is improved, and the amount of material rebound during spraying (
Rebound loss) has been significantly reduced.

4) Since the coarse lumps and fine particles mixed in the material are crushed to a certain particle size or less while being pressed by the mutually interlocking crushing blades, the material is re-aligned and slightly cracked. Since the viscosity increases and the material is continuously supplied to a constant viscosity, it has improved adhesion to the wall surface.

5) Variations in the spraying condition (adhering condition) due to differences in the material condition before use (more or less coarse lumps, length of storage period, more or less moisture, etc.) have been reduced.

6) The time required to install and clean up the unitized spraying equipment has been shortened, and 11 mobility has been improved. Additionally, the overall design has become more compact and the installation area has been reduced.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a conventional example, Fig. 2 is a block diagram of an embodiment of the present invention, Fig. 3 is a sectional view of the same crusher, and Fig. 4 is a
FIG. 3 is a configuration diagram of another embodiment of the present invention. 4... Belt conveyor, 5... Spray machine, 6... Hopper, 7... Circulation pocket group, lO... Discharge hose, 11... Spray nozzle, 13... Air crusa, 15... ...Crusher, 16...Compressed air control device, 1
7... Centralized control panel, 18... Trolley, 21... Honno e-122... Agitator, 23... Crushing blade, 24... Scraper, 27... Partition plate, 31...
...Air pipe, 32...Control valve, 33...Drain separator, 35...Chute.

Claims (4)

[Claims] (1) a. A crusher that crushes coarse lumps of pre-prepared plastic refractories that have adhered and aggregated and continuously discharges glass refractories of a certain particle size or less in fixed quantities, and b. Discharged glass refractories. a means for sequentially transferring materials to a spraying machine; a spraying machine that accepts the C0-transferred glass refractories, sequentially transports them through compressed air and a hose, and sprays them from a spray nozzle at the end of the hose; d. An air pipe that guides compressed air from the air compressor to the spraying machine, and a compressed air control device that is disposed in the middle of the air pipe and has a valve mechanism; e. Power for driving the devices a to d above. 1. A plastic refractory spraying unit comprising: (a) a central control device for distributing and controlling operation and stopping operations; (f) a trolley on which each of the devices from a to e is mounted. (2) Claim (1) characterized in that the compressed air control device has a drain separator for adsorbing and removing moisture and mist contained in the compressed air.
Plastic refractory spraying unit as described in section. (3) A patent characterized in that the central control device includes an automatic control circuit that controls the devices a to d in a seven-case manner so that each device from a to d cooperates to perform a series of spraying operations. A silastic refractory spraying unit according to claim (1). (4) During automatic operation, when a device on the downstream side of the material flow stops its operation for some reason, the central control device detects this and cuts off the power to all the devices on the upstream side at the same time. A refractory spraying unit according to claim 3, characterized in that it has a safety circuit.