JPH1019473A - Wet material spraying device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spraying device and method to prevent the generation of powder dust, prevent the occurrence of lowering of working efficiency due to choking of a nozzle and the decrease of a delivery amount, and provide stable workability under excellent work environment. SOLUTION: A wet material spraying device comprises a feeding part 12 for a monolithic refractory material in a dry state; a material mixing part 14 to mix a material with water; a mixture material feeding part 16 to feed a material, brought into a wet state by mixing with water, to a spraying means, and a nozzle part 18 to spray a material against a given surface of a structure. The mixture material feed part 16 comprises a forced feed pump 46; and a pressure air valve 52 for forced feed to feed high pressure air. The nozzle part 18 comprises a spray nozzle 60, and a pressure air valve 62, and air 56 is intervened in a refractory material 54. The refractory material 54 is injected through the nozzle 60 by a composite press force of a mechanical press force by the pump 46 and a pneumatic press force from the valve 52.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for installing walls of furnaces and other structures, and more particularly to an apparatus and a method for spraying wet amorphous refractory materials by pneumatically transporting the materials. About.

[0002]

2. Description of the Related Art Conventionally, for example, when an amorphous refractory is applied to a wall of a furnace or other structure, water is mixed with a predetermined amorphous refractory material to make the refractory material wet, and the refractory material in the water-containing state is refractory. A gun spraying method of spraying an object using a gun device is widely used. This gun spraying method can be roughly classified into the following three methods. Note that, in the present specification, a state in which moisture is not contained in an amorphous refractory material in a powder state or a state in which the moisture content is extremely small is referred to as a dry state, and moisture is contained in the refractory material in a dry state. The state of being wet is referred to as a hydrated state, and among these hydrated states, the state with the lowest water content is the wet state, the state with the highest water content is the slurry state, and the hydrated state between the wet state and the slurry state is the wet state. I do.

[0003] (1) Dry method: In this method, a predetermined amorphous refractory material in a dry state is pressure-fed into a pipe near a spraying location by pressurized air, and the dry refractory material is dried near a spray nozzle at a tip of the pipe. Add water to the material in the state,
This is a method in which after mixing the material with water, a refractory in a water-containing state is sprayed by the nozzle. This method has an advantage that the spraying operation can be easily achieved in a short time.On the other hand, since the water is added to the dry refractory material and kneaded and sprayed immediately before the spraying, the refractory material and the water are sufficiently mixed. Kneading cannot be performed, and as a result, there is a problem that the quality of the applied refractory material is difficult to be uniform. In addition, when the kneading is not sufficient, the dry or wet refractory material can often be ejected directly from the nozzles, resulting in the generation of dust throughout the work area.

(2) Wet method: This method differs from the dry method in that water is added to a predetermined amorphous refractory material in advance, kneaded, and the kneaded water-containing material is piped to near a spraying position. And blows it out from a nozzle attached to the tip of the pipe. Unlike the dry method, this method does not spray a dry or wet amorphous refractory material, so that dust is not generated by the refractory material, work can be performed in a favorable working environment, and the refractory material can be used. There is no drawback such as insufficient kneading between water and water, resulting in variation in quality. However,
In the wet method, since the amorphous lining material in a powder state is kneaded with water in advance and then pressure-fed to the spray nozzle, it is necessary to convey the water-containing material at the time of pressure-feeding. However, there are drawbacks such as high cost, difficulty in transport, and the need to increase the size of the apparatus.

(3) Two-part method: This method is an intermediate method between the above-mentioned dry method and wet method. That is, a predetermined amount of the amorphous refractory material in a powder state is kneaded with a small amount of water in advance, and the wet state is obtained. It is a method of spraying after adding water or a quick setting agent. This method has the advantage that dust generation is small and the construction body is dense. However, this two-part method of adding water or a quick-setting agent to a hydrated amorphous material near the nozzle is:
Usually, there is a disadvantage that the mixing is insufficient and the material and the quick-setting agent are ejected in a separated state. Further, in some cases, there is a drawback that a binder or the like adheres to the inner wall of the spray nozzle to cause a nozzle coating problem such as clogging of the nozzle or reduction of the discharge amount.

[0006]

The present invention does not involve the generation of dust and the like as in the dry method, and does not cause a decrease in working efficiency due to clogging of nozzles or a decrease in discharge amount unlike the two-liquid method. An object of the present invention is to provide a spraying apparatus and method capable of exhibiting stable workability in an excellent work environment. As described above, in the conventional wet method, it is necessary to convey the construction material containing water.However, the construction material in the water-containing state has a high viscous resistance to the pressure-feeding pipe, and has a disadvantage that the conveyance becomes very difficult. is there. Therefore, in the conventional wet method, in order to suppress the rise of the viscous resistance and to appropriately transport the hydrated construction material, a larger amount of water is added to the hydrated construction material to form a slurry state. Therefore, the material was transported.

However, in such a slurry state, the water content is too large, the amount of construction material loss due to flow-down, etc. increases during construction, and furthermore, the construction body that has been constructed becomes difficult to dry, and There is a problem that it is difficult to obtain a high-density and high-strength construction body due to excessive moisture. In addition, when the water content is high, the discharge force to the construction material becomes relatively weak, and it is not possible to take a sufficient spray distance, and further, it is difficult to obtain a sufficient adhesive force. Occurred. In particular, when the construction body is in a hot state, the construction material adheres to the hot construction body, and at the same time, moisture in the construction material starts to evaporate rapidly. For this reason, the adhesion of the hardened construction material is significantly impaired by the vapor pressure of the water, and it is generally said that the wet method cannot spray at a temperature of about 400 ° C. or more.

[0008] In addition, the wet method has a problem in that since the working material in a slurry state is conveyed, it is essential to completely clean the hose after the spraying operation. This washing operation is not only an obstacle to labor saving, but also is a serious concern today, due to the problems of washing water and environmental pollution.

The present invention solves these problems.

[0010]

In order to solve the above-mentioned problems, in the present invention, a large amount of water is added to a water-containing construction material having a high viscous resistance against the inner surface of a transport pipe as in the past. Without using a means for kneading into a slurry state, the amount of the powdered material to be fed to the kneading machine, that is, the mixing chamber, is determined, and the number of kneading of the powdered material and water is controlled by controlling the rotation speed of the pump motor. While controlling the discharge amount, the construction material in a hydrated state is adjusted. Further, after the water-containing construction material is pumped by the pump motor, pressurized air is injected into the material, pressurized air is interposed in the water-containing material, and pressurized air and mechanical pressure are supplied. , And easily spray a highly viscous amorphous refractory from the nozzle onto the structure. Thus, the above-mentioned problem is completely solved. The amount of water added to the kneading machine can be remotely controlled by removing the adjusting valve from the machine body or connecting it in parallel. The present invention is a construction apparatus and method that conceptually approximates the above-mentioned wet method, but differs from the conventional wet method in that the refractory material does not contain water until it becomes a slurry.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a spraying apparatus according to an embodiment of the present invention; In FIG. 1, a spraying device 10 of the present invention includes a material feeding unit 12 which receives an amorphous refractory material (not shown) supplied from outside the system and feeds the material to a subsequent portion.
A material mixing section 14 for mixing the material with a predetermined amount of water, a mixed material feed section 16 for feeding the material mixed with water to the spraying means, and a material fed from the mixed material feed section 16 into a hollow structure. A nozzle unit 18 for spraying a predetermined inner surface,
It consists of.

The material feeding section 12 has a function of receiving a predetermined irregular shaped powdered refractory material into the spraying device 10 and cutting out the same to feed a predetermined amount to the material mixing section 14. Hopper that accepts
20; a laterally extending material container 22 for containing the material received by the hopper 20; a material disposed in the container 22 and cut out of the material contained in the container 22; Mixing unit 1
4 to adjust the amount of material cut out by the screw 24 at the tip of the container 22, that is, the amount of powdered material to be mixed into a mixing chamber 30 described later. A shutter 26 for adjusting a cut-out amount for adjusting the cut-out amount of the material, and a motor 28 for cutting the material, which is known per se, for driving the screw 24.

The material mixing section 14 includes the material feeding section 1.
The refractory material in a dry state sent from 2 is further homogenized, and a predetermined amount of water is mixed with the material to form a refractory in a wet state. A mixing chamber 30 extending in the vertical direction to receive the dried, amorphous refractory material; a water supply device 32 for adjustingably supplying water supplied from a water source such as tap water into the chamber 30; ,
Rotating around the vertical axis, which has the function of mixing the powder material fed through the cut-out amount adjusting shutter 26 and the water supplied from the water supply device 32 in the mixing chamber 30, preferably kneading. A blade-integrated screw 34, a pump motor 36 for driving the screw 34, and preferably a rotation speed control inverter 38 for controlling the rotation speed of the motor 36,
It consists of.

The water supply device 32 includes a water supply pipe 40 having one end connected to a water source such as tap water and the other end 41 connected to the chamber 30, and a water supply amount adjustment provided in the middle of the pipe 40. A valve 42 and a valve 44 similarly provided at a position close to the other end of the pipe 40 for adjusting the amount of water supply;
It has. Here, the valve 42 is preferably disposed in the vicinity of the nozzle portion 18 so that an operator operating the nozzle portion 18 can freely adjust the valve 42. Further, the valve 44 is preferably an electromagnetic valve in order to easily perform remote control or the like. Further, the mixing chamber 30 includes an upper stirring portion for stirring the material fed through the cutout amount adjusting shutter 26 so as to further homogenize the material, and a water mixing portion below the stirring portion for dissolving the homogenized material in water. And a lower kneading part which forms a wet refractory by kneading. The screw 34 adjusts the number of revolutions of the motor 36 with the help of the inverter 38 to control the kneading state of the material and water in the mixing chamber 30 and the discharge amount of the wet refractory discharged therefrom. It can be controlled. Preferably, the other end 41 of the pipe 40 constituting the water supply device 32 is connected so as to supply water to a kneading portion below the mixing chamber 30 as shown in the figure.

The mixed material feed section 16 has a function of mixing a powder material with a predetermined amount of water to make it wet, and then feeding the wet material to the spray nozzle section 18. A pressure pump 46 which is rotated by the motor 36 in the same manner as the screw 34 and pressurizes and feeds the wet material downward, and a pressurized state fed by the pump 46. A material pumping port 48 for receiving and delivering the wet material of the material, a preferably flexible pumping hose 50 for transporting the pressurized material from the front end of the material pumping port 48 to the nozzle 18; A pressurized air valve for pumping, which is provided at the rear end of the material pumping section 48 and adjustably supplies high-pressure air supplied from a high-pressure air source outside the system into the material pumping section 48. 2, and it is composed of. The valve 52 injects pressurized air from the front end of the material feed port 48 into the pressurized material 54 conveyed through the pressurizing hose 50 to the nozzle 18, and pressurizes the pressurized air 5 into the pressurized material 54.
The amount of pressurized air for interposing 6 is adjusted.

The nozzle portion 18 has a function of spraying the wet material sent from the material feeding portion to the work surface. The nozzle portion 18 receives the end of the pressure feeding hose 50, and the nozzle 60 is connected to the nozzle 60. A pressurized air valve 62 for adjustingly supplying pressurized air for spraying a wet material supplied from outside the system. The nozzle 60 is provided with a water supply device 32 as necessary so that the nozzle operator can freely adjust the amount of water mixed into the wet material.
Can be mounted.

The apparatus 10 has a control panel 70 for appropriately controlling the operation of the entire apparatus. The control panel 70 can operate various motors and valves according to a predetermined procedure. Further, although not shown, the apparatus 10 can include a wastewater treatment cyclone. The cyclone receives wastewater at the beginning and end of the operation of spraying the wet-shaped amorphous refractory material, and solves the problem of environmental pollution when cleaning the apparatus.

In the illustrated example, a shutter 26 for blocking the exit area of the container 22 is used as a member for adjusting the amount of the material cut out from the inside of the material container 22. Instead of 26, a similar effect can be obtained by controlling the rotation speed of the screw 24 rotating in the container. Further, as a means for controlling the number of revolutions of the kneading / pumping motor 36, a mechanical transmission for performing a mechanical shift can be used instead of the inverter 38 for performing an electrical shift as shown in the figure.

The present invention has the above configuration,
It operates as follows. First, the spraying start button on the control panel 70 is turned on (ON). As a result, first, the pressurized pressurized air valve 52 is opened, then the kneading water supply valves 42, 44 of the water supply device 32 are opened, and subsequently, the kneading pressure feeding motor 36 starts rotating. Thereafter, the material cutting screw 24 starts rotating. For this reason, the amorphous refractory material supplied into the material container 22 through the hopper opening 20 is supplied to the shutter 26 or the screw 2 by the screw 24.
The number of rotations of the material mixing section 14 is controlled by a predetermined amount.
Into the mixing chamber 30. The material in a dry state fed into the mixing chamber 30 is mixed with a predetermined amount of water fed into the mixing chamber 30 via the pipe 40 by the screw 34 to be in a wet state.

Next, the wet material is supplied to the pressure pump 4
6 pushes into the material pressure port 48. The high-pressure material mechanically pushed into the material pressure feeding portion 48 is further fluidly pressurized by the high-pressure air supplied through the valve 52. Some of this high pressure air is
And is present as intervening air 56 in the material 54. As described above, a large number of intervening airs 56 exist in the wet material 54 according to the present invention. For this reason, the specific gravity of the material 54 is smaller than that of the conventional wet method. Therefore, in the material 54 of the present invention, it is not necessary to improve the conveyance state by adding excess water to the water-containing material to make the material into a slurry state as in the case of the known wet method. Therefore, the material 5 of the present invention
4 is a mechanical pressing force by the pressure pump 46 and a valve 5
Pneumatic pressure by high-pressure air supplied via
In the combined pumping state, the liquid is easily transported to the nozzle 60 through the pumping hose 50. The wet material reaching the nozzle 60 is further subjected to high-pressure air from the valve 62,
The moving speed is further accelerated, and a predetermined amount of wet construction material from the nozzle 60 is increased at a large speed to a desired distance.
It is injected.

By operating the nozzle 60, the operator can quickly spray a furnace or other desired structure onto the construction wall surface. If it is desired to adjust the water content of the construction material being sprayed, the purpose can be easily achieved by adjusting the valve 42 of the water supply device 32 disposed near the nozzle 60. .

The operation of each of the above-described valves and the like can be easily performed by an automatically controlled program or by manual operation. When the spraying operation is completed, the control panel 7
By turning off the 0 stop button, the apparatus can be stopped in a procedure reverse to that at the time of starting.

As described above, in the present invention, the amount of material to be kneaded is adjusted by adjusting the amount of material to be charged when the refractory material in a dry state is charged into the kneading machine and controlling the number of revolutions of the pump motor. The kneading state and the discharge amount can be appropriately adjusted. Further, after mechanically pumping the material containing water up to the wet state, pressurized air is further injected into the wet material so that the pressurized air is interposed in the material. As a result, the material is reduced in weight, and combined pumping by mechanical pumping at the same time as pressurized air pumping,
It allows quick and complete blowing of the material. Furthermore, the amount of water added to the kneading machine can be quickly adjusted by remotely or manually operating the flow control valve, so that spraying in an optimum state can always be performed.

The present invention is particularly useful for the construction of the walls of a furnace structure, but is very stable and stable in a work environment which is extremely excellent as an apparatus and a method for constructing the walls of other structures. It is usefully used under the working efficiency.

In the above embodiment, the material feeding section 12 is arranged horizontally and the material mixing section 14 is arranged vertically, but this is merely an example for illustration.
If necessary, the material feeding section 12 is arranged vertically and the material mixing section 14 is arranged horizontally, or the material feeding section 12 and the material mixing section 14 are arranged horizontally and both are arranged vertically. Is also possible.

Further, in the illustrated example, the screw 2
The motor 4 and the screw 34 are driven by different motors 28 and 36, respectively, but one motor can be used if necessary.

[0027]

In view of the fact that it is difficult to transport a refractory containing water in the conventional wet method, a large amount of water is added to the refractory and the mixture is kneaded to form a slurry to perform a pressure-feeding operation. I was On the other hand, in the present invention, instead of adding and kneading such a large amount of water, the cutout amount of the construction material is adjusted by controlling the opening / closing degree of the shutter or the number of rotations of the pump and adding the construction material to the wet construction material. Compressed air is being injected. Thereby, the kneading amount and the discharge amount can be adjusted to a state most suitable for the construction conditions, and also, because air is interposed in the material,
It is possible to increase the air content of the refractory material in a hydrated state having poor fluidity, to reduce the density of the refractory material, and to easily transport the refractory material. In addition, after the water was moistened to the wet state, the jetting power from the spray nozzle was increased using pressurized air, and sufficient adhesion to the construction surface and construction to a long distance were enabled. Furthermore, since there is no excess water as in the case of the slurry state, hot spraying under extremely low dust has become possible.
Further, the hose is completely washed out after the spraying, so that the refractory material in the hose is completely blown out so that the hose can be almost unnecessary. Further, the spraying nozzle operator himself can adjust the water supply amount at hand, and the water supply amount can be quickly adjusted without generating a time difference.

As a result, the problems of the wet method up to now, such as loss of construction material due to flow down during construction, delay of drying of the construction body portion, and high-density and high-strength construction due to excessive moisture. The difficulty of obtaining a body has been completely resolved. Furthermore, the problem that the discharge force to the construction material was weakened due to the high water content, the spray distance could not be sufficiently secured, and it was difficult to obtain a sufficient adhesive force was solved. In addition, the problem that spraying at a temperature of about 400 ° C. or higher cannot be completely solved. Furthermore, the problem of cleaning the hose after the spraying operation has been completely solved.

[Brief description of the drawings]

FIG. 1 is an overall view of a spraying apparatus showing an embodiment embodying the present invention.

[Explanation of symbols]

10: Spraying device 12: Material feeding portion 14: Material mixing portion 16: Mixed material feeding portion 18: Nozzle portion 20: Hopper opening 22: Material container 24: Screw 26: Shutter 28: Motor 30: Mixing chamber 32: Water supply device 34 : Screw 36: Motor 38: Inverter 40: Pipe 41: Other end 42, 44: Valve 46: Pumping pump 48: Material pumping port 50: Pumping hose 52: Valve 54: Material 56: Intervening air 60: Nozzle 62: Valve 70: Control panel

Claims (6)

[Claims] 1. A material feeding section 12 for receiving a dry amorphous refractory material supplied from the outside and feeding it to a subsequent portion, and a material mixing section 14 for mixing the material with a predetermined amount of water to make it wet. A mixed material feeding section 16 for feeding the wet material to the spraying means, a nozzle section 18 for spraying the wet material sent from the mixed material sending section 16 onto a predetermined surface of the structure, A refractory material spraying device 10 for applying to a wall surface of a structure, comprising: a material feeding unit 12, a hopper 20, a material container 22, and a material disposed in the container 22. A material mixing section 14, a water supply device 32 for supplying water into the chamber 30, The mixed material feed section 16 comprises a pressure feed pump 46, a material pressure feed port 48, a pressure feed hose 50, and a pressure feed pump for supplying high-pressure air into the material pressure feed port 48. A compressed air valve 52;
The nozzle unit 18 includes a spray nozzle 60 and the nozzle 60
And a pressurized air valve 62 that feeds pressurized air that blows a refractory material in a wet state to the mixed material feed unit 16. Air 56 is interposed in the wet refractory material 54 in the pumping hose 50, and the refractory material 54 is combined with the mechanical pressing force of the pump 46 and the pneumatic pressing force of the valve 52. A wet material spraying device which is ejected from a nozzle 60 by pressure. 2. A part of the high-pressure air supplied into the pressure-feeding hose 50 via the valve 52 enters the wet material 54 and becomes interposed air 56, thereby reducing the specific gravity of the material 54. The wet material spraying apparatus according to claim 1, characterized in that: 3. The material feeding section 12 includes a material mixing section 14.
The wet material spraying apparatus according to any one of the preceding claims, wherein a shutter 26 is provided between the wet material spraying apparatus and the apparatus. 4. A water supply apparatus comprising: a water supply pipe having one end connected to a water source such as tap water and the other end connected to a chamber; A water amount adjusting valve 42 and a valve 44 similarly provided at a position close to the other end of the pipe 40 for adjusting the water supply amount.
The wet material spraying device according to any one of the preceding claims, wherein the valve 42 is disposed near the nozzle portion 18, and the valve 44 is an electromagnetic valve. 5. The wet material spraying apparatus according to claim 1, further comprising a wastewater treatment cyclone for treating wastewater from the nozzle 60. 6. A method for spraying a refractory material in a wet state on a wall surface of a structure, the method comprising: cutting and supplying a predetermined amount of a dry refractory material; Adding a predetermined amount of water to the supplied material to form a wet refractory material, supplying pressurized air to the wet refractory material, and pressurizing air into the wet refractory material. Intervening, feeding the refractory material in a wet state with the pressurized air to the nozzle, and further using the pressurized air to convert the refractory material in the wet state with the pressurized air into the nozzle A wet refractory material spraying method for applying a wet refractory material to a wall surface of a structure, the method comprising: