KR102337774B1 - Blocking post for hazardous chemicals and chemical terrorism concern substances - Google Patents

Abstract

The present invention relates to a blocking rod for detection of hazardous chemicals or terrorism concern substances. The blocking rod includes: a housing having an inlet and an outlet formed on one side; a drum rotatably installed inside the housing; a blocking belt has one side wound on a drum, the other side drawn in and out through the inlet and outlet; and a sensing material which is applied to the blocking belt in a predetermined form and changes color in response to a specific gas.

Description

BLOCKING POST FOR HAZARDOUS CHEMICALS AND CHEMICAL TERRORISM CONCERN SUBSTANCES

The present invention relates to a blocking rod for detecting hazardous chemicals or substances of concern for chemical terrorism, which can quickly detect and notify the surroundings of hazardous chemicals or substances of concern for chemical terrorism sprayed in a relevant area in the event of a chemical terrorism or chemical accident.

In the Hazardous Chemicals Control Act, in preparation for chemical terrorism or chemical accidents, chemical substances with high acute toxicity or explosive properties that are highly likely to cause accidents or that are feared to cause large damage in case of terrorism are designated as accident preparation substances and chemical terrorism substances. and are managed separately.

Hydrogen chloride (HCl), hydrogen fluoride (HF), chlorine (Cl ₂ ), hydrogen cyanide (HCN), hydrogen sulfide (H ₂ S), ammonia (NH ₃ ), formaldehyde among substances of concern for chemical terrorism designated and managed by the Ministry of Environment (CH ₂ O) is widely used in society and can be diverted to chemical accidents and chemical terrorism.

In addition, among hazardous chemicals, those used for military purposes are called chemical agents, and nerve agents (VX, GB, etc.), asphyxiation agents (CG, DP, etc.), blood agents (AC, CK, etc.), blister agents (H, HD) etc.), vomiting and tear agonists (CS, etc.) are representative, and are used for various purposes such as killing people and restricting local facilities. In other words, among hazardous chemicals, chemical agents dedicated to military use are solid, liquid, or gaseous chemicals used to have a direct toxic effect on animals and plants, including humans.

Among these chemical agents, nerve agents are highly volatile, so in the event of a chemical terrorism or chemical accident, they may spread rapidly to a large area and cause great damage. In fact, during the Aum Shinrikyo incident in Japan in 1995, sarin (GB) gas, a nerve agent, was sprayed, resulting in the death of about 6,300 people.

In order to quickly respond to such chemical accidents or chemical terrorism, it is necessary to quickly detect and notify the surrounding area of hazardous chemicals or chemical terrorism substances sprayed in the area.

However, there is no preparation for chemical accidents or chemical terrorism in multi-use facilities such as banks, airports, concert halls, and subway stations in Korea.

Korean Patent Registration No. 10-1293663 (2013.07.31)

The present invention has been devised to solve the above problems, and an object of the present invention is to detect a sensing material that changes color by reacting with a hazardous chemical on a blocking rod provided in a multi-use facility such as a bank, airport, performance hall, subway station, etc. In the event of a chemical accident or chemical terrorism, a hazardous chemical or chemical terrorism concern material that can be quickly detected through the color change of the sensing material and notified to the surrounding area. will be.

The blocking rod for detecting hazardous chemicals or chemical terrorism concerns according to the present invention comprises: a housing having an entrance and exit on one side; a drum rotatably installed inside the housing; One side is wound on the drum, the other side is a blocking belt that can be drawn in and out through the inlet and outlet; and a sensing material applied to the blocking belt in a predetermined shape and changing color in response to a specific gas.

In addition, the sensing material is applied to a predetermined section from a point on the entrance/exit of the blocking belt to a specific point in the housing in a state in which the blocking belt is maximally wound on the drum, and covers the predetermined section of the blocking belt It is characterized in that it further comprises a protective film.

In addition, it characterized in that it further comprises; at least one fixing part formed inside the housing and coupled to the outer surface of the protective film.

The shielding belt further includes a protective film covering the portion accommodated in the housing, wherein the protective film has a bellows structure, one side of the protective film is coupled to the drum, and the other side of the protective film is It is characterized in that it is coupled to the inlet and outlet.

In addition, the protective film is characterized in that the antistatic film.

In addition, the sensing material is characterized in that the color is changed by reacting with at least one _{of HCl, HF, Cl 2} , HCN, H ₂ S, NH3, CH _{2 O.}

In addition, it characterized in that it further comprises a; elastic member for providing an elastic force in a direction in which the blocking belt is wound with respect to the drum.

In addition, a color change detection sensor for detecting a color change of the sensing material; and an alarm unit that outputs a warning sound or a warning light when the color change detection sensor detects a change in the color of the sensing material.

Accordingly, the blocking rod for detecting hazardous chemicals or chemical terrorism concerns according to the present invention is equipped with a detection material that changes color by reacting with a hazardous chemical on a blocking rod provided in a multi-use facility such as a bank, airport, concert hall, subway station, etc. In the event of a chemical accident or chemical terrorism, it is possible to quickly detect and notify the surrounding area by changing the color of the sensing material to detect hazardous chemicals or chemical terrorism-related substances sprayed in the area.

1 is a perspective view showing Example 1 of a blocking rod for detecting hazardous chemicals or chemical terrorism concerns according to the present invention;
Figure 2 is an assembly view showing the connection part of Example 1 of the blocking rod for detecting hazardous chemicals or chemical terrorism concerns according to the present invention.
Figure 3 is an exploded perspective view showing Example 1 of the blocking rod for detecting hazardous chemicals or chemical terrorism concerns according to the present invention.
4 is a cross-sectional view showing a casing, a drum and a blocking belt of Example 1 of the blocking rod for detecting hazardous chemicals or chemical terrorism concerns according to the present invention.
5 is a cross-sectional view showing a casing, a drum, a blocking belt, and a protective film of Example 2 of the blocking rod for detecting hazardous chemicals or chemical terrorism concerns according to the present invention.
6 is a cross-sectional view showing a casing, a drum, a blocking belt, and a protective film of Example 3 of the blocking rod for detecting hazardous chemicals or chemical terrorism concerns according to the present invention.
7 is a perspective view showing Example 4 of a blocking rod for detecting hazardous chemicals or chemical terrorism concerns according to the present invention.
8 is a cross-sectional view showing the detection film and the depression of Example 4 of the blocking rod for detecting hazardous chemicals or chemical terrorism concerns according to the present invention. (See AA` in FIG. 7)

Hereinafter, the technical idea of the present invention will be described in more detail with reference to the accompanying drawings.

Since the accompanying drawings are only examples shown to explain the technical idea of the present invention in more detail, the technical idea of the present invention is not limited to the form of the accompanying drawings.

[Example 1]

1 is a perspective view showing Example 1 of a blocking rod for detecting a hazardous chemical or a chemical terrorism concern according to the present invention, FIG. 2 is a connection part of Example 1 of a blocking rod for detecting a hazardous chemical or a chemical terrorism concern according to the present invention 3 is an exploded perspective view showing Example 1 of the blocking rod for detecting hazardous chemicals or chemical terrorism concerns according to the present invention, FIG. 4 is a blocking rod for detecting hazardous chemicals or chemical terrorism concerns according to the present invention It is a cross-sectional view showing the casing, drum and barrier belt of Example 1.

As shown in Figure 1, the blocking rod for detecting hazardous chemicals or chemical terrorism concerns according to the present invention is provided in a multi-use facility such as a bank, airport, performance hall, subway station, etc., and the color changes by reacting with hazardous chemicals By having a sensing material that detects a chemical accident or chemical terrorism, it is possible to quickly detect and notify the surroundings of a hazardous chemical sprayed in the area through a color change of the sensing material.

As shown in FIGS. 1 to 4, Embodiment 1 of the blocking rod for hazardous chemicals or chemical terrorism concerns according to the present invention includes a post 100, a housing 200, an elastic member 300, a drum 400, It may include a blocking belt 500 , a sensing material 600 , a color change detection sensor (not shown), and an alarm unit 700 .

The post 100 supports the housing 200 , and the housing 200 is detachably coupled to the upper portion of the post 100 .

As shown in FIGS. 2 to 3 , the post 100 may be configured in a structure capable of adjusting the length in the vertical direction. As an example, the post 100 may include a fixed rod 110 , a moving rod 120 , and a locking unit 130 .

The fixed rod 110 is disposed on the ground and is inserted into the moving rod 120 . An upper portion of the fixing rod 110 may have a smaller diameter than a lower portion of the fixing rod 110 . Meanwhile, a first through hole 111 for penetrating the locking part 130 may be formed in the fixing rod 110 in a horizontal direction.

The moving rod 120 accommodates the upper portion of the fixed rod 110 therein, and may be raised and lowered along the upper portion of the fixed rod 110 in a state of accommodating the upper portion of the fixed rod 110 . In this way, the vertical length of the post 100 is adjusted by the elevating and lowering of the moving rod 120 . Meanwhile, in the moving rod 120 , a second through hole 121 for penetrating the locking unit 130 may be formed in a horizontal direction, and the second through hole 121 is arranged in a vertical direction on the moving rod 120 . can be formed by a plurality of

The locking unit 130 is intended to fix the moving rod 120 to the fixed rod 110 , and the locking unit 130 has a first through hole 111 of the moving rod 120 and a second through hole of the fixed rod 110 . It is penetrated through 121 , and the moving rod 120 can be fixed to the fixed rod 110 .

In more detail, the locking unit 130 has one of the plurality of second through holes 121 of the moving rod 120 by the elevating and lowering of the moving rod 120 , the first through hole 111 of the fixed rod 110 . In the aligned state, the second through hole 121 of the aligned moving rod 120 and the first through hole 111 of the fixed rod 110 are penetrated, and the moving rod 120 is fixed to the fixed rod 110 . can do.

The housing 200 is connected to the upper portion of the moving rod 120 , and in this case, the moving rod 120 and the housing 200 may be coupled to each other through the connecting part 140 .

The connection part 140 serves to support the housing 200 so that the inclination can be adjusted. The connection unit 140 may include a first connector 141 , a second connector 142 , and a combination coupling 143 .

The first connector 141 is fastened to the lower portion of the housing 200 . For example, stud bolts may be used for the first connector 141 .

The second connector 142 is fastened to the upper portion of the moving tube. And the second connector 142 is connected to the first connector 141 and the combination coupling 143 as a medium. The second connector 142 is made of a flexible material. Accordingly, when the user tilts the housing 200 , the second connector 142 , which is a medium connecting the housing 200 and the moving tube, is bent and maintained, so that the inclination of the housing 200 can be adjusted. For example, a flexible metal tube may be used as the second connector 142 .

The combination coupling 143 connects the first connector 141 and the second connector 142, and a first screw hole through which the first connector 141 is fastened is formed at the upper portion, and the second connector ( A second screw hole to which 142) is fastened is formed.

1 to 4 , the housing 200 accommodates the elastic member 300 , the drum 400 and the blocking belt 500 , and includes a casing 210 , an upper cover 220 , and a lower cover. 230 , a blocking cover 240 and a rotation shaft 250 may be included.

The casing 210 forms a circumferential surface of the housing 200, and has an upper surface and a lower surface open. An inlet and outlet 211 through which the blocking belt 500 can be drawn in and out is formed on the circumferential surface of the casing 210 .

The upper cover 220 forms the upper surface of the housing 200 and is detachably fastened to the opened upper surface of the casing 210 . Here, the upper cover 220 and the casing 210 may be detachably fastened by screw coupling. At this time, by removing the upper cover 220 from the casing 210, the elastic member 300 installed adjacent to the lower side of the upper cover 220 can be easily replaced.

The lower cover 230 forms the lower surface of the housing 200 and is detachably fastened to the opened lower surface of the casing 210 . Here, the lower cover 230 and the casing 210 may be detachably fastened by screw coupling. At this time, by removing the lower cover 230 from the casing 210 , the blocking belt 500 installed adjacent to the upper side of the lower cover 230 can be easily replaced.

A connection hole 231 to which the first connector 141 of the connection part 140 is screwed may be formed in the central axis of the lower cover 230 .

The blocking cover 240 is coupled between the upper cover 220 and the lower cover 230 . Accordingly, the inside of the casing 210 by the blocking cover 240 has a first storage space (not shown) provided on the upper side of the blocking cover 240 and a second storage space provided on the lower side of the blocking cover 240 ( not shown). The upper portion of the rotary shaft 250 and the elastic member 300 are accommodated in the first storage space, and the lower portion of the rotary shaft 250, the drum 400 and the blocking belt 500 are accommodated in the second storage space.

A communication hole 241 for communicating the first storage space and the second storage space is formed on the central axis of the blocking cover 240 . The rotation shaft 250 passes through the communication hole 241 .

The rotary shaft 250 transmits the elastic force of the elastic member 300 to the drum 400 , and the elastic member 300 is wound on the upper portion of the rotary shaft 250 , and the central portion of the rotary shaft 250 is a communication hole 241 . The lower part of the rotating shaft 250 is fixed to the fixing groove 410 of the central shaft of the drum 400 . Accordingly, the elastic force of the elastic member 300 is transmitted to the drum 400 through the rotation shaft 250 .

The elastic member 300 is wound on the upper portion of the rotation shaft 250 , and applies an elastic force to the rotation shaft 250 and the drum 400 in a direction in which the blocking belt 500 is wound. The elastic member 300 may be a spiral spring.

The drum 400 is fixed to the lower portion of the rotating shaft 250 , and one side of the blocking belt 500 is wound around the outer circumferential surface of the drum 400 . As described above, an elastic force is applied to the drum 400 in a direction in which the blocking belt 500 is wound by the elastic member 300 . Therefore, as long as the other side of the blocking belt 500 is not fixed, the drum 400 is constantly rotated in the direction in which the blocking belt 500 is wound by the elastic force of the elastic member 300, so that one side of the blocking belt 500 is not fixed. While being wound around the drum 400 , the other side of the blocking belt 500 may be introduced through the inlet/outlet 211 .

The blocking belt 500 is formed of a fiber material such as nylon, and one side is wound around the drum 400 and the other side is inserted into the inlet and outlet 211 . Accordingly, when the user pulls the other side of the blocking belt 500 , one side of the blocking belt 500 is unwound from the drum 400 and the other side of the blocking belt 500 may be withdrawn through the inlet/outlet 211 .

The blocking belt 500 may serve to guide the user to only pass through a predetermined passage by interconnecting two adjacent blocking rods.

The sensing material 600 is applied in a predetermined form on one or both surfaces of the blocking belt 500 and changes color in response to a specific gas. The sensing material 600 may be applied to the blocking belt 500 in a rectangular shape.

The sensing material 600 may be a material capable of changing color by reacting with at least one of HCl, HF, Cl ₂ , HCN, H ₂ S, NH3, and CH _{2 O.}

Accordingly, the blocking rod for detecting hazardous chemicals or chemical terrorism concerns according to the present invention includes a detection material 600 that changes color by reacting with hazardous chemicals on the blocking belt 500, thereby preventing chemical terrorism or chemical accidents. In the same situation, there is an advantage that an emergency situation can be quickly notified to the surroundings through a color change of the sensing material 600 .

Meanwhile, the sensing material 600 may include at least one of metalloporphyrins, a pH indicator dye, a solvatochromic dye, a Vapochromic dye, and a metal salt dye. can Here, the pH indicator dye is nitrazine yellow, bromocresol purple, bromophenol blue, bromocresol green, brilliant green, alizarin red ( alizarin red), litmus blue, fluorescein, nile red, methyl red, chlorophenol red, Mercury chloride, 4-( It may be at least one selected from the group consisting of 4-nitrobenzyl) pyridine (4-(4-nitrobenzyl) pyridine), N-benzylaniline, and tetrabutyl ammonium hydroxyl solution. .

A color change detection sensor (not shown) may be electrically connected to the detection material 600 to measure an optical signal and an electrical signal due to a color change of the detection material 600 . For example, a light intensity sensor may be used as the color change detection sensor.

The alarm unit 700 is electrically connected to the color change detection sensor and outputs a warning sound or a warning light when the color change detection sensor detects a color change of the sensing material 600 . Therefore, people around can recognize the emergency situation in case of chemical terrorism or chemical accident even through the warning light or warning light of the alarm unit 700 .

The alarm unit 700 may have a solar cell that can be charged by sunlight, and may receive power from the solar cell.

[Example 2]

5 is a cross-sectional view showing a casing, a drum, a blocking belt, and a protective film of Example 2 of the blocking rod for detecting hazardous chemicals or chemical terrorism concerns according to the present invention.

As shown in Figure 5, Example 2 of the blocking rod for detecting hazardous chemicals or chemical terrorism concerns according to the present invention is the configuration of Example 1 of the blocking rod for detecting hazardous chemicals or chemical terrorism concerns according to the present invention However, the protective film 810 and the fixing part 900 may be additionally included.

In this embodiment, the sensing material 600 is a predetermined point from a point on the inlet/outlet 211 of the barrier belt 500 to a specific point in the housing 200 in a state where the barrier belt 500 is maximally wound around the drum 400 . It can be applied multiple times in the section. At this time, the sensing materials may be applied in a line along the longitudinal direction to a predetermined section of the blocking belt 500 .

In this embodiment, the protective film 810 is for protecting the plurality of sensing materials 600 applied to a predetermined section of the barrier belt 500 , and covers a predetermined section of the barrier belt 500 .

Accordingly, one surface and the other surface of the adjacent barrier belt 500 during a predetermined section of the barrier belt 500 are separated by the protective film 810 . Accordingly, it is possible to prevent the sensing material 600 from being scratched and damaged by the surface of the barrier belt 500 when the barrier belt 500 is drawn out or drawn in.

Meanwhile, the protective film 810 may be formed in a pocket shape.

In addition, the protective film 810 may be formed in the form of a pair of films enclosing both sides of the blocking belt 500 , respectively.

The fixing part 900 serves to fix the protective film 810 , and at least one is formed inside the housing 200 and is coupled to the outer surface of the protective film 810 . The fixing part 900 may be formed as a pair and coupled to both surfaces of the protective film 810 . The fixing part 900 may be made of a stainless steel or aluminum material.

As the protective film 810 is fixed by the fixing unit 900 in this way, the shape of the protective film 810 is maintained when the blocking belt 500 is pulled out or pulled in, and the blocking belt 500 is formed with the protective film 810 ) can be slid along.

In this way, in a state in which the protective film 810 is fixed by the fixing unit 900 , an antistatic film may be used as the protective film 810 .

As a result, as the generation of static electricity between the protective film 810 and the barrier belt 500 is suppressed when the barrier belt 500 is drawn out or drawn in, the local portion of the protective film 810 is prevented from sticking to the barrier belt 500 . can be prevented

On the other hand, when a local portion of the protective film 810 adheres to the barrier belt 500 , the protective film 810 may be damaged as the local portion of the protective film 810 extends along the drawing out or retracting of the barrier belt 500 . have. To prevent this, the protective film 810 is preferably an antistatic film.

Meanwhile, the antistatic film may be made of a material including a surfactant. In addition, the antistatic film may be made of a conductive polymer material.

[Example 3]

6 is a cross-sectional view showing a casing, a drum, a blocking belt, and a protective film of Example 3 of the blocking rod for detecting hazardous chemicals or chemical terrorism concerns according to the present invention.

As shown in FIG. 6, Example 3 of the blocking rod for detecting hazardous chemical or chemical terrorism concern according to the present invention is the configuration of Example 1 of the blocking rod for detecting hazardous chemical or chemical terrorism concern according to the present invention However, it may further include a protective film 820 in the shape of a bellows.

In this embodiment, a plurality of sensing materials 600 may be applied to the entire area from one end of the blocking belt 500 to the other end. At this time, the sensing materials may be applied in a line along the longitudinal direction to the entire length of the blocking belt 500 .

In the present embodiment, the protective film 820 covers the portion accommodated in the housing 200 of the blocking belt 500 and is formed in a bellows structure. At this time, one side of the protective film 820 is coupled to the drum 400 , and the other side of the protective film 820 is coupled to the inlet/outlet 211 , whereby the protective film 820 is coupled to the drum together with the blocking belt 500 . (400) is wound. More specifically, referring to FIG. 6 , the protective film 820 may be wound around the drum 400 together with the portion accommodated in the housing 200 of the blocking belt 500 .

Accordingly, when the blocking belt 500 is pulled out, the protection film 820 covering the portion accommodated in the housing 200 in the blocking belt 500 is compressed, and the protection film 820 moves from the blocking belt 500 to the housing 200 . ) will cover the remaining part except for the part drawn out to the outside.

In addition, when the blocking belt 500 is drawn in, the protection film 820 covering the portion accommodated in the housing 200 in the blocking belt 500 expands, and the protection film 820 moves from the blocking belt 500 to the housing ( 200) will additionally cover the portion leading into the interior.

Meanwhile, the protective film 820 may be an antistatic film.

Also, the protective film 820 may be formed in a pocket shape.

In addition, the protective film 820 may be formed in the form of a pair of films surrounding both sides of the blocking belt 500 , respectively.

[Example 4]

7 is a perspective view showing Example 4 of the blocking rod for detecting hazardous chemical or chemical terrorism concern according to the present invention, and FIG. 8 is the detection of Example 4 of the blocking rod for detecting hazardous chemical or chemical terrorism concern according to the invention It is a cross-sectional view (refer to AA′ in FIG. 7) showing the membrane and the depression.

7 to 8, Example 4 of the blocking rod for detecting hazardous chemical or chemical terrorism concern according to the present invention is Example 1 of the blocking rod for detecting hazardous chemical or chemical terrorism concern according to the present invention However, including the configuration of, a recessed portion 510 may be additionally formed in the blocking belt 500 .

A plurality of depressions 510 may be formed in a line along the longitudinal direction of the blocking belt 500 . The recessed part 510 has a plurality of recessed grooves 511 recessed in a dot matrix form on the surface of the blocking belt 500 .

The sensing material 600 is applied to the recessed groove 511 to form the sensing film 610 . In this case, the thickness of the sensing film 610 may be thinner than the thickness of the recessed groove 511 . Accordingly, a recessed space 511a is formed between the end of the recessed groove 511 and the sensing film 610 .

Therefore, when the blocking belt 500 is drawn out or drawn in, the detection film 610 is spaced apart from the surface of the adjacent blocking belt 500 by the recessed space 511a, so that the detection film 610 is separated from the blocking belt 500 . It can be prevented from being scratched and damaged on the surface of

The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention as claimed in the claims.

100: holding
110: fixed rod
111: first through hole
120: moving rod
121: second through hole
130: locking unit
140: connection part
141: first connector
142: second connector
143: combination coupling
200: housing
210: casing
211: entrance and exit
220: upper cover
230: lower cover
231: connection hole
240: blocking cover
241: communication hole
250: rotation shaft
300: elastic member
400: drum
410: fixed groove
500: blocking belt
510: depression
511: recessed home
511a: recessed space
600: sensing material
610: sensing film
700: alarm unit
810, 820: protective film
900: fixed part

Claims (8)

A housing having an inlet and an outlet formed on one side;
a drum rotatably installed inside the housing;
One side is wound on the drum, the other side is a blocking belt that can be drawn in and out through the inlet and outlet; and
A sensing material that is applied to the blocking belt in a predetermined form and changes color in response to a specific gas,
The sensing material is applied in a predetermined section from a point on the inlet and outlet of the barrier belt to a specific point in the housing in a state in which the barrier belt is maximally wound on the drum;
a protective film covering the predetermined section of the barrier belt and enclosing both surfaces of the barrier belt; and
A blocking rod for detecting hazardous chemicals or chemical terrorism concerns further comprising at least one fixing part formed as a pair inside the housing and coupled to both sides of the protective film.
delete delete A housing having an inlet and an outlet formed on one side;
a drum rotatably installed inside the housing;
One side is wound on the drum, the other side is a blocking belt that can be drawn in and out through the inlet and outlet; and
A sensing material that is applied to the blocking belt in a predetermined form and changes color in response to a specific gas,
Further comprising a protective film covering the portion accommodated in the housing in the blocking belt,
The protective film is formed in a bellows structure,
One side of the protective film is coupled to the drum, and the other side of the protective film is coupled to the inlet and outlet, and the blocking belt is wound on the drum together with a portion accommodated in the housing for detecting hazardous chemicals or chemical terrorism concerns. blocking rod.
5. The method of claim 1 or 4,
The protective film is
An anti-static film, a blocking rod for detecting hazardous chemicals or chemical terrorism concerns.
5. The method of claim 1 or 4,
The sensing material is
HCl, HF, Cl ₂ , HCN, H ₂ S, NH3, CH ₂ O Blocking rod for detecting hazardous chemicals or substances of concern, which are substances that change color by reacting with at least one.
5. The method of claim 1 or 4,
A blocking rod for detecting hazardous chemicals or chemical terrorism concerns further comprising an elastic member for providing an elastic force in a direction in which the blocking belt is wound with respect to the drum.
5. The method of claim 1 or 4,
a color change detection sensor for detecting a color change of the sensing material; and
When the color change detection sensor detects a change in the color of the sensing material, the blocking rod for detecting hazardous chemicals or chemical terrorism concerns further comprises an alarm unit for outputting a warning sound or warning light.

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