KR102598851B1 - Dry sand manufacturing and spraying method - Google Patents

Abstract

The present invention relates to a method of manufacturing and spraying dry sand. The method of manufacturing and spraying dry sand according to an embodiment of the present invention includes measuring the moisture content of sand fed into a hopper, and determining the moisture content of the measured sand. A step of calculating a drying time based on the drying time, transferring the sand flowed from the hopper to the transfer module toward the sand injection module at a transfer rate according to the calculated drying time, and heating and drying the dry sand transferred from the transfer module. It includes spraying using an injection module. As a result, the present invention enables local procurement of a sufficient amount of dry sand required for extinguishing a metal fire regardless of the condition of the sand around the metal fire site, and further enables the production of sufficiently dried sand regardless of the humidity conditions 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.

Description

Dry sand manufacturing and spraying method}

The present invention relates to a dry sand production and spraying method. More specifically, when sand is input into a hopper, the input sand is heated and dried in the process of transporting it toward the sand injection module, and dried sand is manufactured and sprayed directly at the metal fire site. Furthermore, by automatically adjusting the heating and drying time of the sand according to the humidity of the input sand, sufficiently dried sand can be produced regardless of the humidity condition of the surrounding sand. At the same time, if the humidity of the surrounding sand is low, the dry sand can be produced. It relates to dry sand manufacturing and spraying methods that enable rapid production.

As is known, fire is an oxidation phenomenon that burns rapidly, and refers to a combustion phenomenon that spreads contrary to human intention or is caused by arson and requires fire extinguishing. Typically, in Korea, fires are classified into Class A fire, Class B fire, Class C fire, and Class D fire depending on the cause of ignition and igniting material, and the method of extinguishing these fires also varies depending on the classification.

Class A fire refers to a general fire, specifically a fire caused by igniting general combustible objects such as wood and paper. Most fires are class A fires, and the most reliable means of extinguishing fires are removing substances, spraying water to lower the temperature, or blocking oxygen.

Class B fire refers to an oil fire. Specifically, fires caused by oil ignition due to gas station fires, tank overturn accidents, etc. are classified as Class B fires. Since oil floats on water, if you try to extinguish it with water, the fire will not be extinguished but rather will spread. Therefore, sand or fire extinguishers are usually used as means of extinguishing class B fires, 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 using water with dissolved surfactants.

A Class C fire refers to an electrical fire. Specifically, a fire that occurs when the covering material, etc. catches fire due to a short circuit or short circuit, is classified as a Class C fire. Water should not be used for electrical fires either. This is because it can cause electric shock and as electricity flows through the water, the fire may become bigger. However, after cutting off the electricity supply, the fire can be extinguished in the same way as a type A fire, and extinguishing it using water is also possible.

Class D fire refers to a rapid fire caused by highly reactive alkali metals such as lithium, sodium, potassium, cesium, and magnesium. To extinguish a class D fire like this, neither water nor ordinary fire extinguishers can be used. In particular, when using water to extinguish a metal fire, special care must be taken as hydrogen may be generated through a chemical reaction and a hydrogen explosion may occur.

To extinguish such metal fires, you can use a special fire extinguisher for extinguishing metal fires or use sand. In particular, since sand is easily available nearby, firefighters also often use sand to extinguish rapid fires.

However, when using sand as a means of extinguishing a metal fire, if wet sand containing more than a certain amount of moisture is used, an explosion may occur due to the moisture in the wet sand. Therefore, when sand is used to extinguish a metal fire, sufficiently dried sand must be used.

Accordingly, a device for producing dry sand by drying sand, such as the 'sand drying device' of Republic of Korea Patent No. 10-1004048, was developed. However, it is unsuitable in terms of efficiency to always prepare and store dry sand manufactured using such a device and then transport and use a sufficient amount of dry sand to the metal fire site for fire extinguishment. Procurement has limitations.

Republic of Korea Patent No. 10-1004048

The present invention is to solve the problems of the prior art mentioned above, and the purpose of the present invention is to heat and dry the sand in the process of transferring it to the sand injection module when sand is input into the hopper, thereby preventing metal fires from occurring at the scene of a metal fire. It is possible to manufacture and spray dry sand directly, and furthermore, by automatically adjusting the heating and drying time of the sand according to the humidity of the sand being input, sufficiently dried sand can be produced regardless of the humidity condition of the surrounding sand. At the same time, the humidity of the surrounding sand can be produced. When is low, it provides a dry sand manufacturing and spraying method that enables rapid production of dry sand.

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 conditions of the surrounding sand, and to improve drying efficiency when the humidity of the surrounding sand is low. The aim is to provide a dry sand manufacturing and spraying method that can improve efficiency.

Another object of the present invention is to measure the humidity of dry sand sprayed through a sand spray module, recalculate the drying time based on the measured humidity, detect when sand that is not sufficiently dried is sprayed, and detect the drying time. By extending the method, a dry sand manufacturing and spraying method is provided that allows spraying of sufficiently dried sand even if the calculation of the appropriate drying time fails.

A dry sand manufacturing and spraying method according to an embodiment of the present invention includes measuring the moisture content of sand input into a hopper, calculating a drying time based on the measured moisture content of the sand, and transferring from the hopper. It includes transferring the sand introduced into the module toward the sand spraying module at a transfer rate according to the calculated drying time and heating and drying it, and spraying the dry sand transferred from the transfer module using the sand spraying module.

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

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

In addition, the dry sand manufacturing and spraying method further includes the step of first heating and drying the sand introduced into the hopper by operating a heating wire provided in the hopper, and in the transferring and heating drying step, the sand introduced from the hopper is fed into the sand spraying module. It can be transported and dried by secondary heating.

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

Additionally, in the step of recalculating the drying time, the drying time may be extended if the measured moisture content of the dried sand is greater than the standard content.

According to the present invention, when sand is input into a hopper, the input sand is heated and dried in the process of transporting it toward the sand injection module, so that dry sand can be manufactured and sprayed directly at the metal fire site, thereby depending on the condition of the sand around the metal fire site. It is possible to locally procure a sufficient amount of dry sand required for extinguishing metal fires, and furthermore, by automatically adjusting the heating and drying time of the sand according to the humidity of the sand being input, sufficiently dried sand is supplied regardless of the humidity conditions of the surrounding sand. It can be produced and 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 improves 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 conditions of the surrounding sand, so that even sand with high humidity can be sufficiently dried. When the humidity of the surrounding sand is low, it has the effect of improving production efficiency.

In addition, the present invention measures the humidity of dry sand sprayed through a sand spray module, recalculates the drying time based on the measured humidity, detects when sand that is not sufficiently dried is sprayed, and extends the drying time to ensure proper drying. Even if the time calculation fails, sufficiently dried sand can be sprayed.

1 is a diagram schematically showing a dry sand manufacturing and spraying apparatus to which the dry sand manufacturing and spraying method according to an embodiment of the present invention is applied.
Figure 2 is a functional block diagram of a dry sand manufacturing and spraying device according to an embodiment of the present invention.
Figure 3 is a flow chart schematically showing a dry sand manufacturing and spraying method according to an embodiment of the present invention.
Figure 4 is a diagram schematically showing a hopper according to an embodiment of the present invention.
Figure 5 is a diagram schematically showing a transfer module and a heating module according to an embodiment of the present invention.
Figure 6 is a diagram schematically showing a separation module and a sand injection 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, unless specifically defined in a different sense in the present invention, should be interpreted as meanings generally understood by those skilled in the art in the technical field to which the present invention pertains, and are not overly comprehensive. It should not be interpreted in a literal or excessively reduced sense. Additionally, if the technical term used in the present invention is an incorrect technical term that does not accurately express the idea of the present invention, it should be replaced with a technical term that can be correctly understood by a person skilled in the art.

Additionally, as used in the present invention, singular expressions include plural expressions unless the context clearly dictates otherwise. In the present invention, terms such as “consists of” or “comprises” should not be construed as necessarily including all of the various components or steps described in the invention, and some of the components or steps are included. It may not be possible, or it should be interpreted as including additional components or steps.

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

Hereinafter, the dry sand manufacturing and spraying method according to the present invention will be examined in more detail with reference to the attached drawings.

Figure 1 is a diagram schematically showing a dry sand manufacturing and spraying apparatus to which a dry sand manufacturing and spraying method according to an embodiment of the present invention is applied, and Figure 2 is a diagram showing a dry sand manufacturing and spraying apparatus according to an embodiment of the present invention. This is a functional block diagram of the device.

The dry sand manufacturing and spraying method according to this embodiment (hereinafter referred to as the 'dry sand spraying method') allows dry sand to be manufactured and sprayed directly at the metal fire site, and furthermore, the sand is sprayed according to the humidity of the input sand. By automatically adjusting the heating and drying time, sufficiently dried sand can be produced regardless of the humidity conditions of the surrounding sand, and at the same time, when the humidity of the surrounding sand is low, rapid production of dry sand is possible.

For this purpose, the dry sand manufacturing and spraying device (hereinafter referred to as 'dry sand spraying device') to which the dry sand spraying method according to this embodiment is applied includes a hopper 10 for injecting sand, and a hopper 10 for injecting sand into the hopper 10. A transfer module 20 that transfers sand toward the sand injection module 50, a heating module 30 that dries the sand transferred to the sand injection module 50, and dry sand transferred from the transfer module 20. A separation module 40 that separates dry sand less than a predetermined volume and supplies it to the sand injection module 50, a sand injection module 50 that sprays the dry sand supplied from the separation module 40, and a hopper 10 ), a first moisture measurement module 60 that measures the moisture content of the sand inputted into the sand, a drying time calculation unit 70 that calculates the drying time required until the moisture content of the input sand falls below a predetermined level, and a transfer module ( It may be configured to include a transfer control unit 80 that controls the transfer speed of 20).

To be described in more detail with reference to FIG. 1, surrounding sand is input into the hopper 10. At this time, since the input sand undergoes a drying process, any sand can be input regardless of moisture content.

Preferably, the hopper 10 is equipped with a hopper heating wire (12 in FIG. 4) so that the input sand can be introduced into the transfer module 20 in a primary dried 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 top of one side of the transfer module 20, and sand passing through the hopper 10 may flow into one side of the transfer module 20. The transfer module 20 transfers 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, which heats and dries the sand so that it dries while being transported along the transfer module 20, may be arranged to surround a portion of the transfer module 20. That is, the sand transported toward the sand spraying module 50 along the transport module 20 may be dried by the heat generated from the heating module 30 surrounding the transport module 20.

When the dried sand heated 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, discharges dry sand over a predetermined volume to the outside, and Dry sand less than the volume can be supplied to the sand injection module 50. The sand injection module 50 can spray the supplied dry sand. Specifically, the sand injection module 50 can spray dry sand together with the compressed air by generating compressed air and spraying the generated compressed air to the outside.

With these configurations, the present invention can directly manufacture dry sand using sand around the metal fire site without preparing separate dry sand, and enable the manufactured dry sand to be immediately sprayed. Therefore, the dry sand injection device according to this embodiment can locally procure a sufficient amount of dry sand required for extinguishing a metal fire regardless of the condition (humidity) of the sand around the metal fire site.

Meanwhile, referring to FIG. 2, the first moisture measurement module 60 measures the moisture content of the sand input into the hopper 10, and the drying time calculation unit 70 measures the moisture content of the sand fed into the hopper 10. Based on the moisture content of one input sand, the drying time required until the moisture content of the input sand falls below a predetermined level can be calculated.

Specifically, the first moisture measurement module 60 is provided separately and measures the amount of moisture contained in sand (sand scheduled to be input into the hopper) around the metal fire site, or is placed inside the hopper 10 and inputs it into the hopper 10. The moisture content of sand can be measured. Here, a moisture content meter may be applied as the first moisture measurement module 60.

The drying time calculation unit 70 calculates the drying time in proportion to the measured moisture content of the sand, so that the drying process can be performed for a longer time as the moisture content of the sand input into the hopper 10 is higher. Here, the drying time calculated by the drying time calculation unit 70 may be calculated differently depending on conditions such as the size of the dry sand injection device and the output temperature of each heating wire provided for drying sand.

When the drying time is calculated, the transfer control unit 80 may control the operation of the transfer module 20 so that the drying time of the sand 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 rotational speed of the transfer screw (21 in FIG. 5) that transfers sand from the transfer module 20.

When the drying time is calculated, the transfer control unit 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. For a specific example, assuming that sand is dried in the transfer module 20 and the length of the transfer drying section is 1 m, and the calculated drying time is 10 seconds, the transfer control unit 80 determines that the sand is dried on the transfer 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.

At this time, the degree of drying of the sand on the transfer module 20 may be determined not only by the transfer speed of the sand but also by the transfer amount per unit time. Therefore, the dry sand injection device according to this embodiment can adjust the amount of sand flowing into the transfer module 20 per unit time depending on the moisture content of the sand.

Specifically, a gate valve (11 in FIG. 4) may be placed at the bottom of the hopper 10 to control the amount of sand discharged to the bottom. A more detailed description of the hopper 10 including the gate valve is shown in FIG. 4. This will be described later with reference to .

In order to control the amount of sand per unit time flowing into the transfer module 20 by controlling the degree of opening of the gate valve, the dry sand injection device according to the present embodiment may be provided with a hopper control unit 90. The hopper control unit 90 controls the opening degree of the hopper 10 by operating the gate valve of the hopper 10 according to the moisture content of the sand introduced into the hopper 10, thereby controlling the sand per unit time flowing into the transfer module 20. The 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 time calculated by the drying time calculation unit 70 The degree of opening of the hopper 10 can be controlled based on time. This is because the drying time is a value calculated by applying conditions such as the moisture content of the sand fed into the hopper 10, the size of the dry sand injection 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 per unit time flowing into the transfer module 20 is inversely proportional to the calculated drying time. Therefore, when the water content of sand is high and drying is required for a long time, drying efficiency is improved by allowing less sand to flow into the transfer module 20 per unit time, and when the water content of sand is low and drying is required for a short period of time, the sand is transferred. Dry sand production efficiency can be improved by allowing a large amount of sand to flow into the module 20 per unit time.

However, if a relatively short drying time is calculated in this way and the amount of sand introduced per unit time into the transfer module 20 increases, drying is not sufficiently achieved and the sprayed sand contains more than a certain amount of moisture, which may cause an explosion in the process of extinguishing a metal fire. there is. To solve this problem, the dry sand injection device according to the present embodiment may be further equipped with a second moisture measurement module 100 that measures the moisture content of the dry sand sprayed from the sand injection module 50.

To be described in more detail with reference to FIG. 2, the second moisture measurement module 100 is a sand injection module 50 to measure the moisture content of dry sand sprayed through the sand injection module 50 after the drying process is completed. ) may be placed on the injection path or provided separately. Here, the second moisture measurement module 100 may also be applied as a moisture content meter like 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 volume through the separation module 40, and then the dry sand exceeding a predetermined volume is discharged to the outside, and only the dry sand less than the predetermined volume is sand sprayed. It is supplied to the module 50, and when the second moisture measurement module 100 is provided separately, the second moisture measurement module 100 is placed at a location where a predetermined volume or more of dry sand discharged to the outside is accumulated. The amount of moisture contained can be measured. This is to prevent the measured value of the second moisture measurement module 100 from being affected by compressed air that is sprayed from the sand spray module 50 during the dry sand spray process.

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

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

Figure 3 is a flow chart schematically showing a dry sand manufacturing and spraying method according to an embodiment of the present invention.

Looking at the dry sand spraying method according to the present embodiment step by step with reference to FIG. 3, first, the first moisture measurement module 60 measures the moisture content of the sand input into the hopper 10 (S10), and the drying time The drying time can be calculated based on the moisture content measured by the calculation unit 70 (S20).

When the drying time is calculated, the transfer speed of the transfer module 20 is controlled by the control of the transfer control unit 80 according to the calculated drying time, and the hopper 10 is controlled by the hopper control unit 90 according to the calculated drying time. ) With the degree of opening controlled, sand can be introduced into the transfer module 20 and transferred and dried in the transfer module 20 (S30).

When 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 sand less than a predetermined volume among the separated dry sand is transferred to the sand injection module 50. It can be supplied to (S40).

The sand injection module 50 sprays sand less than a predetermined volume supplied (S50). The second moisture measurement module 100 can measure the moisture content from dry sand that is sprayed less than a predetermined volume or from dry sand that is separated and discharged more than a predetermined volume (S60).

The drying time calculation unit 70 determines whether the moisture content measured by the second moisture measurement module 100 is less than the standard content value (S70), and if it is less than the standard content value (S70-Y), recalculates the drying time. It is possible to maintain the drying time value calculated without it. At this time, the standard content value may be a moisture content value that does not cause an explosion even if 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 greater than or equal to the standard content value (S70-N), the drying time calculation unit 70 can recalculate the calculated drying time by extending it by the standard time. There is (S80). When the drying time is recalculated, the transfer speed of the transfer module 20 is controlled again by the control of the transfer control unit 80 according to the recalculated drying time, and the transfer speed of the transfer module 20 is controlled again by the control of the hopper control unit 90 according to the calculated drying time. With the degree of opening of the hopper 10 being controlled again, sand can be introduced into the transfer module 20 and transferred and dried in the transfer module 20 (S30).

Through this process, the dry sand spraying method according to this embodiment enables local procurement of a sufficient amount of dry sand required for extinguishing a metal fire regardless of the condition of the sand around the metal fire site, and furthermore, changes the humidity of the input sand. By automatically adjusting the heating and drying time of the sand, sufficiently dried sand can be produced regardless of the humidity conditions of the surrounding sand. At the same time, when the humidity of the surrounding sand is low, it has the effect of enabling rapid production of dry sand.

Figure 4 is a diagram schematically showing a hopper according to an embodiment of the present invention.

As described above, sand is input into the hopper 10, and the sand input into the hopper 10 may flow into one side of the transfer module 20.

When described in detail with reference to FIG. 4, the hopper 10 has an open bottom so that the input sand can be discharged downward. At this time, a gate valve 11 may be placed 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 part of the hopper 10 and the amount of sand discharged through this can be adjusted. Additionally, 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 is equipped with a hopper heating wire 12 to primary dry the sand flowing into the transfer module 20. Specifically, the hopper heating wire 12 may be internally disposed on the outer wall of the hopper 10. The hopper heating wire 12 heats the sand introduced into the hopper 10 and dries it first. This primary drying using the hopper heating wire 12 can improve the degree of drying of the input sand, allowing the size (length) of the transfer module 20 to be reduced.

Preferably, although not shown in the drawings, a hopper screw disposed in an upward and downward direction may be provided at the center of the hopper 10. The hopper screw may be arranged at a predetermined distance from the outer wall of the hopper 10. Accordingly, among the sand fed into the hopper 10, the sand in the center of the hopper's inner space moves upward by the hopper screw, and the sand at the edge of the hopper's inner space moves downward without being affected by the hopper screw.

That is, among the sand introduced into the hopper 10, the sand that is close to the outer wall of the hopper 10 in which the hopper heating wire 12 is built and is greatly affected by heating and drying of the hopper heating wire 12 passes downward to the transfer module 20. The sand that is discharged and is relatively far away from the outer wall of the hopper (10) and thus less affected by heating and drying by the hopper heating wire (12) cannot be discharged to the transfer module (20) and is transported upward by the hopper screw and is pushed toward the outer wall of the hopper (10). It moves downward through a path close to the outer wall of the hopper (10). Therefore, primary drying by the hopper heating wire 12 can be performed evenly regardless of the position of the sand introduced into the hopper 10.

Figure 5 is a diagram 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 spraying module 50, and the heating module 30 can heat and dry the sand being transferred in the transfer module 20. . At this time, if the sand discharged from the hopper 10 to the transfer module 20 is sand that has been primarily dried in the hopper 10, the primarily dried sand is in the heating module 30 while being transferred from the transfer module 20. Secondary drying can be achieved by heat drying.

If explained in more detail with reference to FIG. 5, the sand that passes through the gate valve 11 of the hopper and flows into one side of the transfer module 20 is transferred to the transfer module (21) by the transfer screw 21 provided in the transfer module 20. 20) is transported to the other side. Additionally, a transfer outlet 22 may be formed at the bottom of the other side of the transfer module 20 to discharge the transferred sand toward the sand injection module 50.

The heating module 30 may include a transfer heating wire 31 disposed to surround the periphery of the transfer module 20 . Specifically, the transfer hot wire 31 may be arranged to surround a portion of the transfer path of the transfer module 20. This transfer heating wire 31 can dry the sand transferred along the transfer module 20 through heating.

Figure 6 is a diagram schematically showing a separation module and a sand injection module according to an embodiment of the present invention.

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

For this purpose, the separation module 40 includes a separation net 41 that separates the dry sand according to its volume, and a guide plate 42 that transfers and supplies the separated dry sand less than a predetermined volume to the sand injection module 50. It can be configured as follows.

To be described in more detail with reference to FIG. 6 , the separation net 41 may be disposed on one side below the transfer outlet 22 so that the dry sand discharged from the transfer outlet 22 of the transfer module settles. The dry sand discharged from the transfer outlet 22 settles on the upper side of the separation net 41, and the separation net 41 allows dry sand (S1) less than a predetermined volume among the dry sand settled on the upper side to pass to the lower side and collects the predetermined volume. A plurality of holes having a predetermined volume may be formed to prevent the dry sand S2 from passing through.

Preferably, the separation net 41 may be formed to be inclined at a predetermined angle so that dry sand S2 of a predetermined volume or more that fails to pass downward falls from one side and is discharged to the outside. At this time, the dry sand (S2) discharged to the outside may also contain foreign substances exceeding a predetermined volume.

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

Meanwhile, dry sand (S1) less than a predetermined volume that has passed through the separation net 41 may be supplied to the sand injection module 50 through the guide plate 42. The guide plate 42 is disposed on the lower side of the separation net 41 so that dry sand (S1) 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 injection module 50. It may be arranged to be inclined downward at a predetermined angle toward the sand injection module 50 to supply sand. When the separation module 40 is equipped with a vibration module, the guide plate 42 is also affected by vibration generated from the vibration module, and this vibration causes sand (S1) of less than a predetermined volume on the guide plate 42 to be removed from the sand injection module. It can promote movement toward (50).

In this way, the separation module 40 according to the present embodiment separates only the sand (S1) less than a predetermined volume from the dry sand so that the sand injection module 50 can spray the dry sand (S1) less than a predetermined volume. It can be supplied to the module 50. Therefore, the dry sand spraying method according to this embodiment can spray only dry sand less than a predetermined volume, which can improve the spray range of dry sand, improve firefighting efficiency, and sand (rocks) more than a predetermined volume. It can prevent injuries or damage caused by spraying together.

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

Preferably, the sand injection module 50 may be further equipped with a pump heating wire that heats the compressed air generated by the air pump 52 to generate overheated compressed air. The compressed air superheated by the pump heating wire has the effect of ultimately heating and drying the dry sand sprayed through the spray hose 51.

As described above, among the dry sand transferred through the transfer module 20, dry sand exceeding a predetermined volume 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 that is separated and discharged in this way may fall from one side of the separation net 41 and accumulate at the falling point. Also, if sand accumulates excessively at the landing point, there is a problem that it may form an obstacle and interfere with fire suppression operations.

To solve this problem, the separation module 40 according to this embodiment may be equipped with a fan that blows wind toward the falling point.

The fan of the separation module 40 may operate to disperse dry sand of a predetermined volume or more accumulated at the landing point, or may disperse dry sand of a predetermined volume or more falling toward the landing point to prevent it from accumulating at the landing point.

Therefore, the dry sand spraying method according to this embodiment can reduce the separately discharged sand from excessively accumulating in a specific location to form an obstacle, and prevent fire suppression operations from being interfered with by the formed sand obstacle.

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

The above description is merely an illustrative explanation of the technical idea of the present invention, and those skilled in the art will be able to make various modifications and changes 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 idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present invention.

10: Hopper
11: gate valve
12: Hopper heating wire
20: transfer module
21: transfer screw
22: transfer outlet
30: heating module
31: transfer heating 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 calculation unit
80: transfer control unit
90: Hopper control unit
100: second moisture measurement module

Claims (6)

Measuring the moisture content of sand input into the hopper;
Calculating drying time based on the measured moisture content of the sand;
Primary heating and drying the sand introduced into the hopper by operating a heating wire installed on the outer wall of the hopper;
adjusting the degree of opening of a gate valve disposed at the lower end of the hopper to introduce sand that has been first heated and dried in the hopper into a transfer module;
Secondary heating and drying the sand flowing from the hopper to the transfer module by transferring it toward the sand injection module at a transfer rate according to the calculated drying time; and
A step of spraying the dry sand transferred from the transfer module using the sand spray module,
In the primary heat drying step, the hopper screw disposed in the vertical direction at the center of the hopper operates to transport sand in the center of the hopper upward, and the sand introduced into the hopper is first heated and dried,
In the step of introducing the sand introduced into the hopper into the transfer module, the sand is introduced so that the amount of sand introduced per unit time is inversely proportional to the calculated drying time.
According to claim 1,
The step of calculating the drying time calculates the drying time in proportion to the measured moisture content of the sand,
In the transfer and heat drying step, the dry sand manufacturing and spraying method is characterized in that 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.
delete delete The method of claim 1, wherein the dry sand manufacturing and spraying method
Measuring the moisture content of dry sand sprayed through the sand injection module; and
A dry sand manufacturing and spraying method comprising the step of recalculating the drying time based on the measured moisture content of the dry sand.
According to claim 5,
In the step of recalculating the drying time, the drying time is extended if the measured moisture content of the dry sand is more than the standard content.