KR20220095768A - Dry sand manufacturing and spraying method - Google Patents

Abstract

The present invention relates to a method for manufacturing and spraying a dry sand. The method for manufacturing and spraying the dry sand according to one embodiment of the present invention comprises: measuring a moisture content of a sand introduced into a hopper; calculating a drying time based on the measured moisture content of the sand; transferring the sand introduced into a transfer module from the hopper toward a sand spraying module at a transfer speed according to the calculated drying time and heating and drying the sand; and spraying the dry sand transferred from the transfer module using the sand spraying module. Therefore, according to the present invention, sufficient quantities of the dry sand required to extinguish a metal fire can be procured locally regardless of a sand condition surrounding a metal fire site. Furthermore, sufficiently dry sand can be produced regardless of a humidity condition of a surrounding sand. At the same time, rapid production of the dry sand is possible when humidity of the surrounding sand is low.

Description

Dry sand manufacturing and spraying method

The present invention relates to a method for manufacturing and spraying dry sand, and more particularly, when sand is put into a hopper, it is heated and dried in the process of transferring the sand to a sand spray module to produce and spray dry sand directly at the site of a metal fire. Furthermore, by automatically adjusting the heating and drying time of the sand according to the humidity of the input sand, it is possible to produce sufficiently dry sand regardless of the humidity condition of the surrounding sand. It relates to a drying yarn manufacturing and spraying method that enables rapid production.

As is known, fire is an oxidation phenomenon that burns rapidly, and it means a combustion phenomenon that is necessary for extinguishing caused by arson or expanding against human intention. In Korea, fires are usually classified into Class A fires, Class B fires, Class C fires, and Class D fires depending on the cause and ignition material, and the extinguishing method of these fires varies according to the classification.

Class A fire refers to a general fire, specifically, a fire caused by setting fire to a general combustible object such as wood or paper. Most of the fires fall under this class A fire, and the most reliable means of extinguishing are removal of toxic substances, lowering the temperature by spraying water, or blocking oxygen.

Class B fires refer to oil fires. Specifically, fires caused by burning oil due to gas station fires or tank overturning accidents are classified as Class B fires. Oil floats on water, so if you try to extinguish it with water, the fire spreads rather than extinguishes. Therefore, sand or a fire extinguisher is usually used as a means of extinguishing a Class B fire, and water is not used. Of course, Class B fires caused by flammable liquids heavier than water can be extinguished using water, and Class B fires can be extinguished with water dissolved in surfactant.

Class C fires refer to electric fires. Specifically, fires caused by fires caused by fires caused by short circuits or short circuits are classified as Class C fires. Electric fires should not use water either. This is because it can cause an electric shock and increase the possibility of a fire as electricity flows through the water. However, after the electricity supply is cut off, the fire can be extinguished in the same way as the Type A fire, and it is also possible to extinguish the fire using water.

Class D fire means rapid fire, and it means fire caused by highly reactive alkali metals such as lithium, sodium, potassium, cesium, and magnesium. In extinguishing such a Class D fire, water as well as a conventional fire extinguisher cannot be used. In particular, when water is used to extinguish a metal fire, special attention should be paid to the generation of hydrogen through a chemical reaction, which may cause a hydrogen explosion.

Special fire extinguishers for metal fires can be used or sand can be used to extinguish these metal fires. In particular, in the case of sand, since it is easily available in the vicinity, firefighters often use sand to quickly extinguish fires.

However, when using sand as a means of extinguishing a metal fire, if wet sand containing more than a predetermined amount of moisture is used, an explosion may occur due to the moisture in the wet sand.

Accordingly, a device for manufacturing dry sand by drying sand, such as the 'sand drying device' of Korean Patent Registration No. 10-1004048, has been developed. However, it is inefficient in terms of efficiency to always prepare and store dry sand prepared using such a device, and then transport and use a sufficient amount of dry sand to a metal fire site for fire extinguishing, and dry sand at a metal fire site. Procurement has limitations.

Republic of Korea Patent Registration No. 10-1004048

The present invention is to solve the problems of the prior art mentioned above, and an object of the present invention is to heat and dry the sand in the process of transferring the sand to the sand blasting module when the sand is put into the hopper, so that it can be used in a metal fire site. Directly manufactures dry sand so that it can be sprayed, and furthermore, by automatically adjusting the heating and drying time of sand according to the humidity of the input sand, sufficiently dry sand can be produced regardless of the humidity condition of the surrounding sand, and at the same time, the humidity of the surrounding sand It is to provide a dry sand manufacturing and spraying method that enables rapid production of dry sand when is low.

Another object of the present invention is to improve drying efficiency when the humidity of the surrounding sand is high by controlling the amount of sand per unit time flowing from the hopper to the transfer module according to the humidity condition of the surrounding sand, and to produce when the humidity of the surrounding sand is low. An object of the present invention is to provide a drying sand manufacturing and spraying method capable of improving efficiency.

Another object of the present invention is to measure the humidity of the dry sand sprayed through the sand spray module and recalculate the drying time based on the measured humidity to detect when the sand that has not been sufficiently dried is sprayed and the drying time It is to provide a drying sand manufacturing and spraying method capable of spraying sufficiently dry sand even if the calculation of an appropriate drying time fails by extending the

Dry sand manufacturing and spraying method according to an embodiment of the present invention comprises the steps of measuring the moisture content of sand put into a hopper, calculating a drying time based on the measured moisture content of the sand, and transferring from the hopper It includes the steps of transferring the sand introduced into the module to the sand blasting module at a transport speed according to the calculated drying time and heating and drying the sand, and spraying the dry sand transferred from the transport module using the sand blasting module.

At this time, in the step of calculating the drying time, the drying time is calculated in proportion to the measured moisture content of the sand, and in the step of transferring and heating and drying, the rotation speed of the conveying screw provided in the conveying module is calculated in inverse proportion to the drying time. You can adjust the feed speed by adjusting it.

In addition, the dry sand manufacturing and spraying method further includes the step of introducing the sand put into the hopper into the transfer module, and in the step of introducing the sand put into the hopper into the transfer module, the sand inflow amount per unit time is inversely proportional to the calculated drying time. can be introduced.

In addition, the drying sand manufacturing and spraying method further includes the step of first heating and drying the sand put into the hopper by operating a heating wire provided in the hopper, and in the transferring and heat drying step, the sand introduced from the hopper is applied to the sand spray module. It can be transferred and dried by secondary heating.

In addition, the dry sand manufacturing and spraying method may include measuring a moisture content of dry sand sprayed through a sand blasting module and recalculating a drying time based on the measured moisture content of the dry sand.

In addition, the step of recalculating the drying time may extend the drying time if the measured moisture content of the dry sand is equal to or greater than the reference content.

According to the present invention, when sand is put into the hopper, the sand is heated and dried in the process of transferring it to the sand blasting module, so that dry sand can be produced and sprayed directly at the metal fire site. It enables local procurement of a sufficient amount of dry sand required for extinguishing metal fires without the need for metal fire extinguishing, and furthermore, by automatically adjusting the sand heating and drying time according to the humidity of the input sand, it is possible to obtain sufficiently dried sand regardless of the humidity condition of the surrounding sand. At the same time, it has the effect of enabling rapid production of dry sand when the humidity of the surrounding sand is low.

In addition, the present invention adjusts the amount of sand per unit time flowing from the hopper to the transfer module according to the humidity condition of the surrounding sand, so that when the humidity of the surrounding sand is high, the drying efficiency is improved, so that even the sand with high humidity can be sufficiently dried, When the humidity of the surrounding sand is low, it has the effect of improving the production efficiency.

In addition, the present invention measures the humidity of the dry sand sprayed through the sand spray module and recalculates the drying time based on the measured humidity to detect when sand that has not been sufficiently dried is sprayed and extend the drying time to ensure proper drying. Even if the calculation of time fails, it is possible to spray dry sand sufficiently.

1 is a diagram schematically illustrating a drying yarn manufacturing and spraying apparatus to which a drying yarn manufacturing and spraying method according to an embodiment of the present invention is applied.
2 is a functional block diagram of a drying yarn manufacturing and spraying device according to an embodiment of the present invention.
3 is a flowchart schematically illustrating a drying sand manufacturing and spraying method according to an embodiment of the present invention.
Figure 4 is a view showing a schematic appearance of a hopper according to an embodiment of the present invention.
5 is a diagram schematically showing a transfer module and a heating module according to an embodiment of the present invention.
6 is a diagram schematically illustrating a separation module and a sand blasting module according to an embodiment of the present invention.

It should be noted that the technical terms used in the present invention are only used to describe specific embodiments, and are not intended to limit the present invention. In addition, the technical terms used in the present invention should be interpreted as meanings generally understood by those of ordinary skill in the art to which the present invention belongs, unless otherwise specifically defined in the present invention, and excessively comprehensive It should not be construed in the meaning of a human being or in an excessively reduced meaning. In addition, when the technical term used in the present invention is an incorrect technical term that does not accurately express the spirit of the present invention, it should be understood by being replaced with a technical term that can be correctly understood by those skilled in the art.

Also, the singular expression used in the present invention includes the plural expression unless the context clearly dictates otherwise. In the present invention, terms such as “consisting of” or “comprising” should not be construed as necessarily including all of the various components or various steps described in the invention, some of which components or some steps are included. It should be construed that it may not, or may further include additional components or steps.

In addition, it should be noted that the accompanying drawings are only for easy understanding of the spirit of the present invention, and should not be construed as limiting the spirit of the present invention by the accompanying drawings.

Hereinafter, a drying yarn manufacturing and spraying method according to the present invention will be described in more detail with reference to the accompanying drawings.

1 is a view schematically showing a drying yarn manufacturing and spraying apparatus to which a drying yarn manufacturing and spraying method according to an embodiment of the present invention is applied, and FIG. 2 is a drying yarn manufacturing and spraying according to an embodiment of the present invention. It is a functional block diagram of the device.

The dry sand manufacturing and spraying method (hereinafter referred to as 'drying spraying method') according to this embodiment makes it possible to directly manufacture and spray dry sand at the site of a metal fire, and furthermore, in accordance with the humidity of the input sand, By automatically adjusting the heating and drying time, sufficiently dry sand can be produced regardless of the humidity condition of the surrounding sand, and at the same time, it is characterized in that it enables rapid production of dry sand when the humidity of the surrounding sand is low.

To this end, the dry sand manufacturing and spraying device to which the dry sand spraying method according to the present embodiment is applied (hereinafter referred to as 'drying spraying device') is a hopper 10 for putting sand and input to the hopper 10 . A transfer module 20 for transferring one sand toward the sand blasting module 50 , a heating module 30 for drying the sand transferred to the sand blasting module 50 , and dry sand transferred from the transfer module 20 . A separation module 40 for separating dry sand less than a predetermined volume among them and supplying it to the sandblasting module 50 , a sandblasting module 50 for spraying dry sand supplied from the separation module 40 , and a hopper 10 ), a first moisture measurement module 60 for measuring the moisture content of the sand input to the ), a drying time calculator 70 for calculating the drying time required until the moisture content of the input sand becomes less than a predetermined value, and a transfer module ( 20) may be configured to include a transfer control unit 80 for controlling the transfer speed.

More specifically, referring to FIG. 1 , the surrounding sand is put into the hopper 10 . At this time, since the input sand goes through a drying process, any sand can be put in regardless of the moisture content.

Preferably, the hopper 10 is provided with a hopper hot wire (12 in Fig. 4) so that the input sand can be introduced into the transfer module 20 in a dry state before being heated and dried in the transfer module 20, A more detailed description of the hopper 10 including this will be described later with reference to FIG. 4 .

The transfer module 20 may form a transfer path of a predetermined length arranged in a horizontal direction with the ground. The hopper 10 is disposed at the upper end of one side of the transfer module 20 , and the sand passing through the hopper 10 may be introduced into one side of the transfer module 20 . The transfer module 20 transfers the sand introduced from one side to the separation module 40 disposed below the other side along the transfer path, and in this process, the transferred sand may be secondary dried.

Specifically, the heating module 30 for heating and drying sand so that the sand is dried while being transported along the transport module 20 may be disposed to surround a partial section of the transport module 20 . That is, the sand transferred along the transfer module 20 toward the sand blasting module 50 may be dried by the heat generated by the heating module 30 surrounding the transfer module 20 .

When the sand heated and dried by the heating module 30 during transport is transferred to the separation module 40, the separation module 40 separates the transferred dry sand by volume, and discharges the dry sand of a predetermined volume or more to the outside. Less than a volume of dry sand may be supplied to the sandblasting module 50 . The sand spray module 50 may spray the supplied dry sand. Specifically, the sand spraying module 50 may spray dry sand together with the compressed air by generating compressed air and spraying the generated compressed air to the outside.

According to such a configuration, the present invention can directly produce dry sand using sand around a metal fire site without preparing separate dry sand and immediately spray the prepared dry sand. Therefore, the dry sand spraying device according to this embodiment can locally procure a sufficient amount of dry sand required for extinguishing a metal fire regardless of the sand state (humidity) around the metal fire site.

Meanwhile, referring to FIG. 2 , the first moisture measuring module 60 measures the moisture content of the sand input to the hopper 10 , and the drying time calculator 70 is measured by the first moisture measuring module 60 . Based on the moisture content of one input sand, the drying time required until the moisture content of the input sand becomes less than a predetermined value may be calculated.

Specifically, the first moisture measurement module 60 is provided separately to measure the amount of moisture contained in the sand (sand to be put into the hopper) around the metal fire site, or is disposed inside the hopper 10 and put into the hopper 10 . The moisture content of the sand can be measured. Here, a moisture content measuring device may be applied as the first moisture measuring module 60 .

The drying time calculation unit 70 may calculate the drying time in proportion to the measured moisture content of the sand, so that the higher the moisture content of the sand put into the hopper 10, the longer the drying process may be performed. Here, the drying time calculated by the drying time calculator 70 may be calculated differently according to conditions such as the scale of the drying sand spraying apparatus and the output temperature of each heating wire provided for sand drying.

When the drying time is calculated, the transfer controller 80 may operate and control the transfer module 20 so that the time for which the sand is dried on the transfer module 20 is adjusted according to the calculated drying time. Specifically, the transfer control unit 80 may control the transfer speed of the transfer module 20 by controlling the rotation speed of the transfer screw ( 21 of FIG. 5 ) that transfers sand from the transfer module 20 .

When the drying time is calculated, the transfer controller 80 may control the transfer speed of the transfer module 20 so that the sand can be dried during the drying time calculated by the transfer module 20 . As a specific example, assuming that the length of the transport drying section in which the sand is dried in the transport module 20 and transported is 1 m and the calculated drying time is 10 seconds, the transport controller 80 controls the sand on the transport module 20 The transfer speed of the transfer module 20 can be controlled to 0.1 m/s so that it can be dried for 10 seconds.

In this case, the degree of drying of the sand on the transport module 20 may be determined not only by the transport speed of the sand but also by the transport amount per unit time. Therefore, the dry sand spraying device according to the present embodiment can control the amount of sand flowing into the transfer module 20 per unit time according to the moisture content of the sand.

Specifically, a gate valve (11 in FIG. 4) may be disposed at the lower end of the hopper 10 to control the amount of sand discharged to the lower side. It will be described later with reference to .

In order to control the degree of opening of the gate valve to control the amount of sand per unit time flowing into the transfer module 20, the dry sand spraying device according to the present embodiment may include a hopper control unit 90 . The hopper control unit 90 controls the degree of opening of the hopper 10 by operating and controlling the gate valve of the hopper 10 according to the moisture content of the sand put into the hopper 10, thereby controlling the degree of opening of the hopper 10. amount can be adjusted.

The hopper control unit 90 may control the degree of opening of the hopper 10 based on the moisture content of the sand measured by the first moisture measurement module 60 , but preferably the drying calculated by the drying time calculation unit 70 . It is possible to control the degree of opening of the hopper 10 based on time. This is because the drying time is a value calculated by applying conditions such as the moisture content of the sand input into the hopper 10 as well as the scale of the dry sand spraying device and the output temperature of each heating wire provided for sand drying.

The hopper control unit 90 may adjust the degree of opening of the hopper 10 in inverse proportion to the calculated drying time, so that the amount of sand flowing into the transfer module 20 per unit time is inversely proportional to the calculated drying time. Therefore, when drying is required for a long time due to high moisture content of sand, less sand is introduced into the transfer module 20 per unit time to improve drying efficiency, and when drying for a short period of time is required due to low moisture content of sand, transfer By allowing a large amount of sand to flow into the module 20 per unit time, it is possible to improve the dry sand production efficiency.

However, when a relatively short drying time is calculated as described above and the amount of sand flowing into the transfer module 20 per unit time increases, drying is not sufficiently performed, and the spray sand contains more than a predetermined amount of moisture, which may cause an explosion in the process of extinguishing a metal fire. have. To solve this problem, the dry sand spraying device according to the present embodiment may further include a second moisture measuring module 100 for measuring the moisture content of the dry sand sprayed from the sand spraying module 50 .

In more detail with reference to FIG. 2 , the second moisture measuring module 100 is configured to measure the moisture content of the dry sand sprayed through the sand blasting module 50 after the drying process is completed. ) may be disposed on the injection path or may be provided separately. Here, the second moisture measurement module 100 may also be applied with a moisture content meter similar to the first moisture measurement module 60 .

At this time, as described above, the dry sand transferred from the transfer module 20 is separated according to the volume through the separation module 40 , and then the dry sand of a predetermined volume or more is discharged to the outside, and only the dry sand of less than a predetermined volume is sandblasted. It is supplied to the module 50, and when the second moisture measurement module 100 is separately provided, the second moisture measurement module 100 is disposed at a location where the dry sand of a predetermined volume or more discharged to the outside is accumulated, and the dry sand of a predetermined volume or more It is possible to measure the amount of moisture contained in This is to prevent the measured value of the second moisture measuring module 100 from being affected by the compressed air sprayed together during the dry sand blasting process by the sand blasting module 50 .

When the second moisture measurement module 100 measures the moisture content of the dry sand, the drying time calculator 70 may recalculate the drying time based on the measured value of the moisture content of the dry sand.

Specifically, when the moisture content of the dry sand is equal to or greater than the reference content, the drying time calculator 70 may extend the drying time by adding the reference time to the calculated drying time. And when the drying time is extended and recalculated, the transfer control unit 80 changes and controls the transfer speed of the transfer module 20 according to the recalculated drying time, and the hopper controller 90 controls the hopper according to the recalculated drying time. It can be controlled again by changing the degree of opening in (10).

3 is a flowchart schematically illustrating a drying sand manufacturing and spraying method according to an embodiment of the present invention.

Referring to the drying sand spraying method according to this embodiment step by step with reference to FIG. 3 , first, the first moisture measuring module 60 measures the moisture content of the sand input to the hopper 10 ( S10 ), and the drying time The drying time may be calculated based on the moisture content measured by the calculator 70 (S20).

When the drying time is calculated, the transport speed of the transport module 20 is controlled by the control of the transport controller 80 according to the calculated drying time, and the hopper 10 is controlled by the hopper controller 90 according to the calculated drying time. ) in a controlled state, the inflow of sand into the transport module 20 and transport and drying in the transport module 20 may be made (S30).

When the dry sand is transferred from the transfer module 20 to the separation module 40 , the separation module 40 separates the transferred dry sand by volume, and among the separated dry sand, sand less than a predetermined volume is used in the sand blasting module 50 . can be supplied to (S40).

The sand blasting module 50 sprays sand less than the supplied predetermined volume (S50). The second moisture measuring module 100 may measure the moisture content from the sprayed dry sand less than a predetermined volume or from the separated and discharged dry sand with a predetermined volume or more ( S60 ).

The drying time calculation unit 70 determines whether the moisture content value measured by the second moisture measurement module 100 is less than the reference content value (S70), and if it is less than the reference content value (S70-Y), recalculates the drying time It is possible to maintain the value of the drying time calculated without it. In this case, the reference content value may be a moisture content value that does not cause an explosion even when dry sand is put into a metal fire.

On the other hand, if the moisture content value measured by the second moisture measurement module 100 is equal to or greater than the reference content value (S70-N), the drying time calculation unit 70 may extend the calculated drying time by the reference time to recalculate. There is (S80). And when the drying time is recalculated, the transport speed of the transport module 20 is controlled again by the control of the transport controller 80 according to the recalculated drying time, and by the control of the hopper controller 90 according to the calculated drying time In a state in which the degree of opening of the hopper 10 is controlled again, the inflow of sand into the transfer module 20 and transfer and drying in the transfer module 20 may be made (S30).

Through this process, the dry sand spraying method according to this embodiment makes it possible to locally procure a sufficient amount of dry sand required for extinguishing a metal fire regardless of the sand state around the metal fire site, and furthermore, By automatically adjusting the heating and drying time of the sand, it is possible to produce sufficiently dry sand regardless of the humidity condition of the surrounding sand.

4 is a view showing a schematic appearance of a hopper according to an embodiment of the present invention.

As described above, sand is put into the hopper 10 , and the sand put into the hopper 10 may be introduced into one side of the transfer module 20 .

4, the lower end of the hopper 10 is opened so that the input sand can be discharged to the lower side. At this time, a gate valve 11 may be disposed at the lower end of the hopper 10 to control the amount of sand discharged downward. The gate valve 11 can control the degree of opening of the lower end of the hopper 10 and can control the amount of sand discharged through this. In addition, the gate valve 11 may be manually operated by a user, but preferably may be automatically operated by the hopper control unit 90 as described above.

As described above, the hopper 10 may be provided with a hopper heating wire 12 to primarily dry the sand flowing into the transfer module 20 . Specifically, the hopper hot wire 12 may be built-in disposed on the outer wall of the hopper 10 . The hopper hot wire 12 heats the sand put into the hopper 10 and first dries it. The primary drying by the hopper hot wire 12 may improve the degree of drying of the input sand, thereby making it possible to reduce the size (length) of the transfer module 20 .

Preferably, although not shown in the drawings, a hopper screw disposed in the vertical direction may be provided at the center of the hopper 10 . The hopper screw may be disposed to be spaced apart from the outer wall of the hopper 10 by a predetermined distance. Therefore, among the sand put into the hopper 10, the sand at the center of the inner space of the hopper moves upward by the hopper screw, and the sand at the edge of the inner space of the hopper moves downward without being affected by the hopper screw.

That is, among the sand put into the hopper 10, the sand that is greatly affected by the heating and drying of the hopper hot wire 12 close to the outer wall of the hopper 10 having the hopper hot wire 12 built-in passes downward to the transfer module 20. The sand that is discharged and is relatively far from the outer wall of the hopper 10 and is less affected by the heating and drying of the hopper hot wire 12 is not discharged to the transfer module 20 but is transferred upward by the hopper screw and pushed toward the outer wall of the hopper 10 The hopper 10 moves downward through a path close to the outer wall. Therefore, the primary drying by the hopper hot wire 12 can be made evenly regardless of the position of the sand put into the hopper 10.

5 is a view schematically showing a transfer module and a heating module according to an embodiment of the present invention.

As described above, the transfer module 20 transfers the sand discharged from the hopper 10 to the sand blasting module 50 , and the heating module 30 may heat and dry the sand being transferred from the transfer module 20 . . At this time, if the sand discharged from the hopper 10 to the transfer module 20 is primarily dried sand in the hopper 10 , the primary dried sand is transferred from the transfer module 20 to the heating module 30 . It may be secondary dried by heat drying.

5, the sand introduced to one side of the transfer module 20 through the gate valve 11 of the hopper is transferred by the transfer screw 21 provided in the transfer module 20 to the transfer module ( 20) is transferred to the other side. In addition, a transfer outlet 22 for discharging the transferred sand toward the sand blasting module 50 may be formed at the lower end of the other side of the transfer module 20 .

The heating module 30 may include a transfer heating wire 31 disposed to surround the circumference of the transfer module 20 . Specifically, the transfer hot wire 31 may be disposed to surround some sections of the transfer path of the transfer module 20 . The transfer heating wire 31 may dry the sand transferred along the transfer module 20 through heating.

6 is a diagram schematically illustrating a separation module and a sand blasting module according to an embodiment of the present invention.

As described above, the dry sand supplied to the sand blasting module 50 is dry sand of less than a predetermined volume, and for this purpose, the separation module 40 may separate the dry sand transferred from the transfer module 20 according to the volume. .

To this end, the separation module 40 includes a separation net 41 for separating the dry sand according to the volume, and a guide plate 42 for transporting and supplying the separated dry sand less than a predetermined volume to the sand blasting module 50 . can be configured.

Referring to FIG. 6 , more specifically, the separation net 41 may have one side disposed below the transfer outlet 22 so that the dry sand discharged from the transfer outlet 22 of the transfer module is seated. The dry sand discharged from the transfer outlet 22 is seated on the upper side of the separation net 41, and the dry sand S1 less than a predetermined volume among the dry sand seated on the upper side of the separation net 41 passes to the lower side, and the predetermined volume A plurality of holes having a predetermined volume may be formed to prevent the above dry sand S2 from passing through.

Preferably, the separation net 41 may be formed to be inclined at a predetermined angle so that the dry sand S2 of a predetermined volume or more that does not pass downward falls from one side and is discharged to the outside. In this case, the dry sand S2 discharged to the outside may also contain foreign substances having a volume greater than or equal to a predetermined volume.

Preferably, the separation module 40 may be provided with a vibration module that promotes the separation of the dry sand according to the volume and generates vibrations so that the dry sand of a predetermined volume or more (S2) moves to one side along the slope.

Meanwhile, the dry sand S1 having less than a predetermined volume passing through the separation net 41 may be supplied to the sand blasting module 50 through the guide plate 42 . The guide plate 42 is disposed below the separation net 41 so that the dry sand S1 of less than a predetermined volume that has passed through the separation net 41 is seated, and the settled dry sand S1 is transferred to the sand blasting module 50 . It may be disposed to be inclined downward at a predetermined angle toward the sand blasting module 50 to be supplied. When the separation module 40 is provided with a vibration module, the guide plate 42 is also affected by vibrations generated from the vibration module, and this vibration causes the sand S1 of less than a predetermined volume on the guide plate 42 to form a sandblasting module. moving towards (50) can be facilitated.

As described above, the separation module 40 according to the present embodiment separates only the sand S1 of less than a predetermined volume among the dry sand so that the sandblasting module 50 can spray the dry sand S1 of less than a predetermined volume, and then the sand is sprayed. It can be supplied to the module (50). Therefore, the dry sand spraying method according to the present embodiment can spray only dry sand of less than a predetermined volume, and thus the spraying range of the dry sand can be improved, the extinguishing efficiency can be improved, and sand (stones) of a predetermined volume or more Injuries or damage caused by spraying together can be prevented.

The sand spraying module 50 may spray the supplied dry sand through compressed air as described above. To this end, the sand spray module 50 includes a spray hose 51 that forms a guide path to spray the dry sand supplied from the guide plate 42 toward a target point, and dry sand spray through the spray hose 51 . An air pump 52 that is connected to the injection hose 51 to generate compressed air may be provided as possible.

Preferably, the sand blasting module 50 may further include a pump heating wire for heating the compressed air generated by the air pump 52 to generate the compressed air in an overheated state. The compressed air overheated by the pump heating wire has an effect of finally heating and drying the dry sand sprayed through the spray hose 51 .

As described above, of the dry sand transferred through the transfer module 20 , the dry sand of a predetermined volume or more does not pass through the separation net 41 and is separated and discharged to one side. However, the dry sand S2 of a predetermined volume or more separated and discharged in this way may fall from one side of the separation net 41 and accumulate at the point of the drop. In addition, when sand is excessively accumulated at the point of falling as described above, there is a problem that an obstacle may be formed to interfere with fire suppression work.

In order to solve this problem, the separation module 40 according to the present embodiment may be provided with a fan that blows wind toward the falling point.

The fan of the separation module 40 may operate to disperse the dry sand of a predetermined volume or more accumulated at the dropping point or prevent the dry sand of a predetermined volume or more falling toward the falling point from being dispersed and accumulated at the falling point.

Therefore, the dry sand spraying method according to the present embodiment can reduce the formation of obstacles in which the separated and discharged sand is excessively accumulated at a specific location, and it is possible to prevent the fire suppression operation from being disturbed by the formed sand obstacles.

Preferably, when the second moisture measuring module 100 is disposed at the falling point, the fan of the separation module 40 may be disposed toward the space above the falling point at a predetermined height in order to improve the accuracy of the measurement value.

The above description is merely illustrative of the technical spirit of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

10: Hopper
11: Gate valve
12: hopper heated wire
20: transfer module
21: feed screw
22: transfer outlet
30: heating module
31: transfer hot wire
40: separation module
41: separation net
42: guide plate
50: sandblasting module
51: spray hose
52: air pump
60: first moisture measurement module
70: drying time calculator
80: transfer control unit
90: hopper control unit
100: second moisture measurement module

Claims (6)

measuring the moisture content of the sand fed into the hopper;
calculating a drying time based on the measured moisture content of the sand;
heating and drying the sand flowing from the hopper to the transfer module while transferring it toward the sand blasting module at a transfer rate according to the calculated drying time; and
and spraying the dry sand transferred from the transfer module using the sand blasting module.
The method of claim 1,
In the calculating of the drying time, the drying time is calculated in proportion to the measured moisture content of the sand,
Drying yarn manufacturing and spraying method, characterized in that in the step of heating and drying while transferring, the transfer speed is adjusted by adjusting the rotation speed of the transfer screw provided in the transfer module in inverse proportion to the calculated drying time.
The method of claim 1,
The drying sand manufacturing and spraying method further comprises the step of introducing the sand put into the hopper into the transfer module,
In the step of introducing the sand put into the hopper into the transfer module, the sand inflow per unit time is in inverse proportion to the calculated drying time.
The method of claim 3, wherein the drying yarn manufacturing and spraying method is
Further comprising the step of operating a heating wire provided in the hopper to dry the sand put into the hopper by primary heating,
In the transferring and heating and drying step, the sand introduced from the hopper is transferred to the sand blasting module and secondarily heated and dried.
The method of claim 1, wherein the drying yarn manufacturing and spraying method is
measuring the moisture content of the dry sand sprayed through the sand blasting module; and
and recalculating the drying time based on the measured moisture content of the dry sand.
6. The method of claim 5,
The step of recalculating the drying time comprises extending the drying time when the measured moisture content of the dry sand is equal to or greater than a reference content.

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