JPH026996B2 - - Google Patents

Description

[Detailed Description of the Invention] [Prior Art] As is well known, various types of furnaces and molten metal containers have their service life extended by partially repairing the refractory linings that have been worn out over a long period of time or many times of use. In most cases, a spraying machine equipped with a nozzle at the tip is used to spray monolithic refractories and adhere them to the inner wall.

Fig. 3 is a side view showing the structure of a conventional spraying machine. ) 2 is a compressed air supply pipe 3 to a stop valve 4 and a pressure reducing valve 5.
It is pressurized with compressed air supplied through the

Reference numeral 6 denotes a material cutting section communicating with the lower part of the tank 1, into which air is blown out from the compressed air supply pipe 3 via a stop valve 7, a pressure reducing valve 8 and an air blowing nozzle 9.

Reference numeral 10 denotes a secondary air blowing section provided at the tip of the material cutting section, into which compressed air is fed through a compressed air supply pipe 3, a stop valve 11, and a pressure reducing valve 12. Reference numeral 13 denotes a material transport hose connected to this secondary air blowing section, and 14 a water adder installed near the end of the material transport hose, through which water is mixed with the material via a water supply pipe 15 and a stop valve 16. 17 is a nozzle for spraying repair material connected to this water adder. 17 is a stop valve for removing air from the tank 1.

A conventional spraying machine is configured as described above. For example, when material is put into the tank 1, sealed, and pressurized with compressed air from the top, the material is It falls into the cut-out part 6 and is blown toward the transportation hose 13 by the air jetted from the air blowing nozzle 9.

At this time, the material is assisted in transportation by the air jetted from the secondary air blowing section 10, and the discharge state is stabilized.

The material transferred through the transportation hose 13 is mixed with a predetermined amount of water in the water adder 14 and then discharged from the spray nozzle 18 toward the construction object. Note that FIG. 4 is a detailed sectional view of a conventional material cutting section.

[Problem that the invention attempts to solve]

With conventional spray machines like the ones mentioned above, good discharge conditions can only be achieved within well-balanced dimensions of the inlet diameter of the cutout at the bottom of the tank, the inner diameter of the cutout, the outlet diameter of the cutout, and the inner diameter of the hose. can.

For example, if the required discharge rate is 5 to 10 kg/min, the appropriate diameter and inner diameter of the former are approximately 30 mmφ, respectively.
It is best to set the latter diameter and inner diameter to 15 to 20 mmφ to obtain a stable discharge condition, but if the latter diameter is large, the amount of air consumed will increase and the material will be unevenly distributed in the subsequent process. Furthermore, if the latter is small, nozzle clogging and material suffocation phenomena are likely to occur.

In addition, if the former diameter is large, material clogging or suffocation occurs, while if the diameter is small, material bridging occurs.

Furthermore, materials with poor fluidity may cause bridging at the bottom of the tank, and materials with good fluidity may cause blockage or suffocation within the cut-out section, making it difficult to obtain stable, steady flow transport, resulting in poor discharge conditions from the nozzle. There was a problem that the results were uneven.

Furthermore, even in the case of materials that can produce a steady fall or steady flow, there is a problem in that even if the tank internal pressure is adjusted to increase or decrease the steady flow, the flow rate can only be adjusted within a narrow range of pressure adjustment.

This invention was made to solve these problems, and it eliminates the occurrence of bridging at the bottom of the tank regardless of the condition of the materials used, suppresses breathing and pulsating phenomena, and enables smooth discharge. The purpose is to obtain a spraying machine that can expand the range of material flow rate adjustment.

[Means for solving problems]

The spraying machine according to the present invention includes an air blowing nozzle provided with a large number of external jet holes in the material cutting section at the bottom of the internal pressure regulating tank, and this blowing nozzle covers the inlet of the cutting section having a large diameter. This long blowing nozzle is a long blowing nozzle, and a flow rate adjusting part is provided toward the tip of the long blowing nozzle to adjust the flow rate of the material by moving the blowing nozzle in the lateral direction. It is equipped with a built-in part and all operations are performed using compressed air.

[Effect]

The compressed air ejected from the many outlets of the long air blowing nozzle suppresses material falling from the tank even if the inlet diameter is large.
Since the material can be uniformly mixed with air throughout the material cutting section and the flow rate can be adjusted while the material is in a suspended state, material clogging and suffocation in the material cutting section and the flow rate adjustment section (throttling section) are completely eliminated.

Furthermore, since the inlet to the material cutting section can be made larger than the outlet, bridging does not occur even if a material with poor fluidity is used.

Further, by adjusting the lateral movement, that is, the insertion depth, of the long air blowing nozzle, the cross section of the material flow path can be changed widely in the flow rate adjusting section at the tip thereof, so that the flow rate can be adjusted over a wide range.

〔Example〕

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, in which numerals 1 to 8 and 10 to 18 are the same as those of the conventional device.

Reference numeral 19 denotes a long cylindrical air blowing nozzle that is built into the material cutting section 6 and can be moved laterally, that is, change the insertion depth, and is manually moved laterally by loosening the set screw 20. In addition, the length is formed to be long enough to fully cover the material falling port at the bottom of the tank 1, and an air jet hole 21 with a diameter of about 3 mm is formed on the circumferential surface and the tip surface.
There are 29 holes spaced at approximately equal intervals on the entire outer circumferential surface.

Reference numeral 22 denotes a flow rate adjustment section provided on the downstream side of the long air blowing nozzle 19, and its cross section changes when the long air blowing nozzle is moved laterally.

In the spraying machine configured as above,
The material 2 to which internal pressure has been applied in the tank 1 falls into the material cutting section 6, and the material is uniformly mixed with air throughout the material cutting section by the air ejected from the numerous air jet holes 21. It passes through the flow rate adjustment unit 22 in a floating state, flows into the transport hose 13, is mixed with an appropriate amount of water in the water adder 14, and is then discharged from the spray nozzle 18.

This discharge amount increases when the tank internal pressure is increased by the pressure reducing valve 5, but when the insertion depth of the long air blowing nozzle is further deepened (moved laterally to the right side in the figure), the material flow path in the flow rate adjustment section is increased. The cross section is narrowed and the discharge amount can be finely adjusted in the direction of decreasing it.
Conversely, if the insertion depth is made shallow, the discharge amount can be increased in accordance with the tank internal pressure.

In this example, the inlet diameter of the cutout part is 40mmφ, the inner diameter of the material cutout part is 40mmφ, and the outlet diameter of the cutout part is 16mmφ.
φ, outer diameter of long air blowing nozzle 19 20mmφ,
Pressure 1.3-1.8Kg/cm ² , tank internal pressure 1.5-2.0Kg/
By further adjusting the insertion depth of the long air blowing nozzle in the range of cm ² , it is possible to achieve a discharge rate of 5 to 10 kg/min using materials that have bridging and breathing phenomena with conventional equipment. Stable ejection was obtained within this range.

In this invention, even if the material has poor fluidity, bridging will not occur even if the tank internal pressure is somewhat low due to the jetting pressure of the air blowing nozzle, and even if the material has good fluidity, the breathing phenomenon will not occur.
The amount of material falling from the tank is appropriately suppressed by the air ejected from the long air blowing nozzle 19 regardless of the large inflow port diameter, and at the same time, a uniform state of mixing with air and a floating state is maintained throughout the material cutting section. No clogging or suffocation occurred at the throttle section.

Therefore, it was possible to narrow the outlet port to 16 mmφ even with a relatively large inlet diameter of 40 mmφ, thereby expanding the range of flow rate adjustment.

FIG. 2 is a detailed sectional view of the material cutting section, elongated blowing nozzle, and flow rate adjusting section in this embodiment.

In addition, to explain the operating procedure of this spraying machine, the spraying starts when the stop valve 11 is opened, the material remaining in the transportation hose 13 is removed, and at the same time, the material that has fallen into the cutting section is sucked and transported. be done. When the stop valve 16 is opened, a mixture of air and water is discharged from the nozzle 18, and then the operation is started by opening the stop valve 7 and opening the stop valve 4. In particular, in the case of a material with poor fluidity, the stop valve 11 is opened to blow in secondary air to absorb the material in the cut out portion and prevent breathing.

To stop spraying, close stop valves 4 and 7,
Open the stop valve 17, then close the stop valves 11 and 16 after confirming that no material is being discharged from the nozzle.

In addition to spraying monolithic refractories, the present invention can also be used for steady discharge of other powders and powder mixtures.

〔Effect of the invention〕

As explained above, this invention has a structure that can maintain the internal pressure of a tank at a predetermined pressure, a long air blowing nozzle that is equipped with a large number of air blowing holes and that can adjust the air pressure and move, a flow rate adjustment part, and a secondary air blowing part. This structure prevents material bridging, material clogging, and breathing phenomena.
The effect is that the discharge amount can be adjusted over a wide range and that a stable discharge amount can always be obtained. In addition, since only compressed air is used as the power source, the overall structure can be simplified.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is a detailed sectional view of the material cutting section, Fig. 3 is a partial sectional view showing a conventional spraying machine, and Fig. 4 is a conventional blowing machine. FIG. In the figure: 1... Pressurized material tank, 2... Material, 3...
Compressed air supply pipe, 4, 7, 11, 16...
Stop valve, 5, 8, 12...Reducing valve, 6...
...Material cutting section, 10...Secondary air blowing section,
19...Long air blowing nozzle, 20...Blowing nozzle set screw, 21...Air jet hole, 22
...Flow rate adjustment section. Note that the same numbers in each figure indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A long air blowing nozzle with a blowing hole on the outer circumferential surface and adjustable blowing air pressure is built into the material cutting part at the bottom of the material tank whose internal pressure can be adjusted, and the long air blowing nozzle can be moved laterally. 1. A spraying machine characterized by comprising a flow rate adjustment section for controlling the flow rate of a material by adjusting the flow rate of the material, a secondary air blowing section downstream of the flow rate adjustment section, and using compressed air as a power source.