Intelligent building security device and security method

Abstract

The present invention relates to the technical field of building security equipment, and specifically to an intelligent building security device and a security method, wherein an intelligent building security device is used in a stairwell of a building, comprising a handrail shell, the main body of which is a strip-shaped structure, the handrail shell is arranged parallel to the staircase and fixed on the upper wall of the staircase; and a first wind knife, the main body of which is a strip-shaped structure, arranged and fixed along the handrail shell, a high-pressure chamber is arranged inside the first wind knife, a wind nozzle facing the outside is formed on one side of the high-pressure chamber, and the airflow blown out by the first wind knife passes through the wind nozzle to form a first regional wind wall with a certain volume. The intelligent building security device and security method provided by the present invention can effectively improve the survival rate of escaping through the escape stairs in a fire accident in a high-rise building.

Description

Technical Field

[0001] The present invention relates to the technical field of building security equipment, and in particular to an intelligent building security device and a security method. Background Art

[0002] In high-rise residential buildings, when a fire occurs on the lower floors, if the fire doors of the smoke-proof stairwells are missing or not closed properly, a chimney effect will occur, causing the smoke to spread rapidly. The smoke produced by the fire spreads upward. The most deadly killer in fires is the suffocating smoke. The main cause of death from smoke is carbon monoxide poisoning. Smoke will rush into the stairwell from the fire location. The stairwell was originally used for escape in case of fire, but because it is filled with toxic smoke and the existence of the "chimney effect", the stairwell used for escape is full of danger.

[0003] The standard fire safety equipment in existing high-rise buildings includes fire hydrants and fire extinguishers. These facilities cannot function in a dense smoke environment. In addition, the existing family fire safety awareness is weak, and almost no home has a smoke mask. When trapped people escape through the fire stairs, they mostly use the existing fire protection knowledge, cover their mouths and noses with wet towels, and move forward. However, the anti-toxic and anti-smoke capabilities of the wet towels are too poor. When the mouth and nose are covered and sealed, the effective time is only 3 minutes. In addition, heavy smoke will disrupt the escapee's sense of direction and reduce the escape speed, which leads to many accidents in which similar escapees fail to achieve a successful escape. Summary of the invention

[0004] Technical issues solved

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides an intelligent building security device and security method, which can effectively improve the survival rate of escaping through escape stairs in fire accidents in high-rise buildings.

[0006] Technical Solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] On one hand, the present invention provides an intelligent building security device, which is used in a stairwell of a building, and includes a handrail shell, the main body of which is a strip-shaped structure, the handrail shell is arranged parallel to the staircase, and is fixed on the upper wall of the staircase;

[0009] and a first wind knife, the main body of which is a strip-shaped structure and is fixed along the armrest shell, wherein a high-pressure chamber is provided inside the first wind knife, and a wind nozzle facing outward is formed on one side of the high-pressure chamber, and the airflow blown out by the first wind knife passes through the wind nozzle to form a first regional wind wall with a certain volume;

[0010] and a second wind knife, which has the same structure as the first wind knife and is fixedly arranged along the armrest shell, wherein the wind nozzle of the second wind knife forms a second area wind wall, and the second area wind wall and the first area wind wall form a continuous wind wall area;

[0011] and an air compressor, used for providing the airflow with a certain pressure to the first air knife and the second air knife;

[0012] And a light source component for displaying a safety indication mark, the light source component is fixed on the armrest shell, and the light source component is placed in the wind wall area; it also includes a smoke sensor and a controller, when the smoke sensor collects a smoke signal, the controller outputs and controls the actions of various components.

[0013] Another aspect of the present invention provides a security method, which uses one of the above-mentioned intelligent building security devices and includes the following steps:

[0014] Step 1: Detecting smoke information through the smoke sensor;

[0015] Step 2: The controller obtains a high level signal triggered by the smoke sensor;

[0016] Step 3: The controller controls the direct-acting cylinder to drag the first air knife out of the placement cavity, and at the same time, the flip mechanism drags the second air knife to flip to a preset angle, and turns on the light source assembly to dynamically display the safety indication mark;

[0017] Step 4: After the movement reaches the designated position, the limit switch is triggered and the controller obtains the limit switch input signal;

[0018] Step 5: The controller output controls the air compressor to start and open the solenoid valve, and the first wind knife and the second wind knife blow out airflow to form the wind wall area.

[0019] Furthermore, it also includes a movable shell, the second wind knife is fixedly arranged on the movable shell, one side of the movable shell is rotatably connected to the back plate, and the second wind knife rotates with the movable shell.

[0020] Furthermore, the armrest shell includes an upper shell, a lower shell and a back plate, the upper shell and the back plate are integrally formed, the placement cavity is formed between the upper shell and the lower shell, a receiving groove that cooperates with the movable shell is formed on one side of the top of the shell, and an arc-shaped lamp groove is formed on the other side, the light source assembly is installed in the arc-shaped lamp groove, and an arc-shaped lamp cover is fixed on the top of the arc-shaped lamp groove.

[0021] Furthermore, a flip structure is provided at the bottom of the movable shell, and the flip structure includes a support shaft, a cam and a transmission gear. A plurality of cams are fixed on the support shaft, and the support shaft is rotatably arranged on the lower side of the movable shell. The end of the support shaft is linked to the rotating cylinder. The support shaft and the cam are placed in the placement cavity. The cam is provided with a continuous protrusion, and the outer ring of the cam is in contact with the bottom of the movable shell.

[0022] Furthermore, the upper shell and the lower shell are fixed together by a plurality of I-shaped parts, a support ring is formed in the middle of the I-shaped parts, and the support shaft is coaxially rotatably connected to the support ring with a bearing.

[0023] Furthermore, a slide groove is provided on the inner side surface of the accommodation cavity near its opening, and a slider is fixed on the first wind knife. The slider can be slidably fitted in the slide groove, and the first wind knife moves with the slider, and its front end can extend to the outside of the accommodation cavity. A direct-acting cylinder is connected to the side of the first wind knife.

[0024] Furthermore, a main air pipe is fixed in the placement cavity, and a plurality of branch pipe joints are arranged on the main air pipe, and the branch pipe joints are respectively connected to the first air knife and the second air knife through hoses.

[0025] Beneficial Effects

[0026] Compared with the known public technology, the technical solution provided by the present invention has the following beneficial effects:

[0027] The product of the present invention designs a continuous belt-shaped handrail shell structure on the wall of the fire escape staircase, and a first wind knife and a second wind knife which can be automatically controlled to start when a smoke signal is obtained are fixedly arranged on the handrail shell structure, the airflow blown out by the first wind knife passes through its wind nozzle to form a first area wind wall with a certain volume, and the wind nozzle of the second wind knife forms a second area wind wall, wherein the second area wind wall and the first area wind wall form a continuous wind wall area, the wind wall area is a continuous input of external fresh air by an air compressor, forming a fresh and transparent air barrier, which effectively isolates the thick smoke outside the wind wall area, when the escapee escapes along the escape staircase, he bends over and places his face in the wind wall area, and follows the guidance of the light source component displaying the safety indication mark which is also located in the wind wall area, so as to achieve safe and rapid escape, which can greatly improve the probability of successful escape. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 A side view of the use state and principle diagram of the security device of the present invention;

[0030] Figure 2 The security device of the present invention is a perspective view of a working state;

[0031] Figure 3 This is a schematic diagram of laying the security device of the present invention on the fire stairs;

[0032] Figure 4 It is a flip perspective view of the movable housing of the present invention;

[0033] Figure 5 It is a schematic diagram of the explosion of the armrest shell of the present invention;

[0034] Figure 6 It is a side view of the armrest shell and the movable shell of the present invention;

[0035] Figure 7 It is a side view of the movable housing of the present invention;

[0036] Figure 8 It is a schematic diagram of the flipping principle of the movable shell of the present invention (side view);

[0037] Fig. 9 Schematic diagram of the first wind knife movement principle of the present invention (side view);

[0038] Fig.10 Schematic diagram of the first air knife and the second air knife connecting pipe of the present invention (side view);

[0039] The numbers in the figure represent: 10, armrest shell; 11, upper shell; 12, lower shell; 13, placement cavity; 14, accommodating groove; 15, arc-shaped lamp trough; 16, I-shaped part; 161, support ring; 17, slide groove; 18, back plate; 19, step surface; 20, first wind knife; 21, wind nozzle; 22, first area wind wall; 23, slider; 30, second wind knife; 31, second area wind wall; 40, air compression Machine; 50, light source assembly; 51, lampshade; 60, movable shell; 61, first clamping plate; 62, second clamping plate; 63, connecting plate; 64, fixing plate; 65, clamping groove; 70, flip structure; 71, supporting shaft; 72, cam; 721, protrusion; 80, rotary cylinder; 81, direct-acting cylinder; 90, main air pipe; 91, branch joint; 93, hose; 100, protective cover; 110, inclined plate. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] The present invention will be further described below in conjunction with the embodiments.

[0042] Example:

[0043] On the one hand, the present invention provides an intelligent building security device, referring to Figure 1-10 , because the main body of the handrail shell is long, only part of the main body is unfolded in the attached figure. The security device is used in the stairwell of the building to help escapers escape more safely and quickly along the escape stairs in the event of a fire. Of course, the main body of this product is similar to the structure of a daily stair handrail when it is not triggered and can be used as a handrail. The specific structure and working method of this product will be explained below.

[0044] The main structure of the security equipment of the present invention includes a handrail shell 10, the main body of which is a strip-shaped structure. The handrail shell 10 is arranged parallel to the stairs and fixed on the upper wall of the stairs. That is, the handrail shell 10 is arranged in a similar manner to the handrail of the stairs, but is continuously laid and installed along one side of the wall. Of course, the corner is composed of two straight line ends combined and spliced.

[0045] And the first wind knife 20, the main body of which is a strip structure, is fixed along the armrest shell 10, and a high-pressure chamber is provided inside the first wind knife 20. A wind nozzle 21 facing outward is formed on one side of the high-pressure chamber. The wind nozzle 21 adopts a V-shaped wind nozzle 21. The airflow blown out by the first wind knife 20 passes through the wind nozzle 21 to form a first area wind wall 22 with a certain volume.

[0046] And the second wind knife 30 has the same structure as the first wind knife 20 and is fixed along the armrest shell 10. The wind nozzle 21 of the second wind knife 30 forms a second area wind wall 31, and the second area wind wall 31 and the first area wind wall 22 form a continuous wind wall area; an air compressor 40 is provided outside the building for providing an airflow with a certain pressure to the first wind knife 20 and the second wind knife 30.

[0047] And a light source assembly 50 for displaying safety indication signs, the light source assembly 50 is fixed on the armrest shell 10, and the light source assembly 50 is placed in the wind wall area; it also includes a smoke sensor and a controller. When the smoke sensor collects a smoke signal, the controller outputs to control the actions of various components. The controller adopts PLC and can be connected to an external expansion module.

[0048] The first wind knife 20 and the second wind knife 30 are improved by changing the wind nozzle 21 of the wind knife in the prior art to a V-shaped wind nozzle 21, and the angle of the first area wind wall 22 formed by the prior art slit-type wind nozzle 21 is preferably 100-110°. In addition, in order to provide a hand support for the escapee, an outwardly extending inclined plate 110 is fixed at the bottom of the handrail shell 10.

[0049] Main working principle: This product designs a continuous strip-shaped handrail shell 10 structure on the wall of the fire staircase, and a first wind knife 20 and a second wind knife 30 which can be automatically controlled to start when a smoke signal is obtained are fixedly arranged on the handrail shell 10 structure, and the airflow blown out by the first wind knife 20 passes through its wind nozzle 21 to form a first area wind wall 22 with a certain volume, and the wind nozzle 21 of the second wind knife 30 forms a second area wind wall 31, wherein the second area wind wall 31 and the first area wind wall 22 form a continuous wind wall area, and the wind wall area is a continuous input of fresh air from the outside by the air compressor 40 to form a fresh and transparent air barrier, which effectively isolates the thick smoke outside the wind wall area. When the escapee escapes along the escape stairs, he bends over and places his face in the wind wall area, and follows the guidance of the light source assembly 50 displaying safety indication signs which is also located in the wind wall area to achieve safe and rapid escape.

[0050] The following is the detailed structural design:

[0051] The armrest shell 10 includes an upper shell 11 and a lower shell 12, and a placement cavity 13 is formed between the upper shell 11 and the lower shell 12. A receiving groove 14 is formed on one side of the top of the shell to cooperate with the movable shell 60. A movable shell 60 is rotatably arranged in the receiving groove 14, and an arc-shaped lamp groove 15 is formed on the other side. A light source assembly 50 is installed in the arc-shaped lamp groove 15, and an arc-shaped lampshade 51 is fixed on the top of the arc-shaped lamp groove 15. In this embodiment, the light source assembly 50 adopts an LED flexible panel, and cooperates with an intelligent driver to control and display the "arrow pattern". The above is the existing technology and will not be expanded in detail here.

[0052] It also includes a movable shell 60, and the second wind knife 30 is fixedly arranged on the movable shell 60. One side of the movable shell 60 is rotatably connected to the back plate 18. The second wind knife 30 rotates with the movable shell 60. The rotatable movable shell 60 drives the second wind knife 30 to rotate, which is mainly used to further supplement and enhance the wind wall area and strength of the first wind knife 20. At the same time, the air blowing at a rotating top-down angle can effectively wrap the light source assembly 50 for displaying the safety indication mark on the armrest shell 10, thereby ensuring that the "safety indication mark" is clearly visible and ensuring the guiding effect for the escaped personnel.

[0053] Specifically,

[0054] The movable housing 60 includes a first clamping plate 61, a second clamping plate 62, a connecting plate 63 and a fixing plate 64. The fixing plate 64 is fixed between the first clamping plate 61 and the second clamping plate 62. An open clamping groove 65 is formed between the fixing plate 64, the first clamping plate 61 and the relative inner side surfaces of the second clamping plate 62. The second wind knife 30 is embedded in the clamping groove 65. The connecting plate 63 is fixed to the outer side of the first clamping plate 61 and the second clamping plate 62. The side of the connecting plate 63 away from the clamping groove 65 is hingedly connected to the back plate 18. Such a structural design of the movable housing 60 facilitates the fixing of the second wind knife 30 in the movable housing 60 and the subsequent connection of the hose 93.

[0055] In the design of rotating the movable shell 60 over a long distance, taking into account the torque, consumables and ease of assembly, the preferred power source in this solution is a rotary cylinder 80. In order to maintain sufficient torque, a rotary cylinder 80 is provided at both ends of the longer single-sided armrest shell 10, and a rotary cylinder 80 is provided only on one side of the shorter single-sided armrest shell 10.

[0056] Specifically, the flip structure 70 is arranged at the bottom of the movable housing 60, and adopts a lifting method to maintain good support stability in the working state. The flip structure 70 includes a support shaft 71, a cam 72 and a transmission gear. A plurality of cams 72 are fixed on the support shaft 71. The support shaft 71 is rotatably arranged on the lower side of the movable housing 60. The end of the rotating shaft is connected to the rotating cylinder 80 through a flange. The support shaft 71 and the cam 72 are placed in the placement cavity 13. The cam 72 is provided with a continuous protrusion 721, and the outer ring of the cam 72 is in contact with the bottom of the movable housing 60. The support shaft 71 is dragged by the rotating cylinder 80 to rotate, and the protrusion 721 of the cam 72 will slowly lift the movable housing 60, so that it slowly flips along the rotating connection side. The solenoid valve is used to control the start and stop of the rotating cylinder 80. A limit switch is installed on the armrest shell 10. A protrusion is welded on the flange. The protrusion touches the limit switch to know that the rotating cylinder 80 is rotated to the right position.

[0057] Furthermore, an inwardly concave arc groove is formed at the portion where the bottom surface of the movable housing 60 contacts the cam 72, an outwardly extending limit ring is fixed at the edge of the outer ring of the cam 72, and a limit column is fixed at the opening of the arc groove, wherein the limit ring is clamped between the limit column and the bottom surface of the arc groove.

[0058] In addition, the upper shell 11 and the lower shell 12 are fixed together by a plurality of I-shaped parts 16, a support ring 161 is formed in the middle of the I-shaped part 16, and the support shaft 71 is coaxially rotatably connected to the support ring 161 with a bearing. The design of the I-shaped part 16 serves as a connecting fixture between the upper shell 11 and the lower shell 12. At the same time, the support ring 161 thereon can facilitate the installation of the rotating shaft, thereby providing good support for the long rotating shaft.

[0059] Since the second air knife 30 is a hidden design and the solenoid valve of the rotating cylinder 80 is designed to be a P-type locking solenoid valve, the air nozzle 21 of the second air knife 30 is not easily damaged, which affects its use in fire accidents. This is to improve the anti-damage function of the first air knife 20.

[0060] The first wind knife 20 is designed to be reciprocating for a short distance; a slide groove 17 is provided on the inner side surface of the placement cavity 13 near its opening, a slider 23 is fixed on the first wind knife 20, the slider 23 can be slidably fitted in the slide groove 17, the first wind knife 20 moves following the slider 23, and its front end can extend to the outside of the placement cavity 13, and the side of the first wind knife 20 is connected with 3-5 micro direct-acting cylinders 81 as a power source. When the first wind knife 20 moves outward to a position, the inner wall of the armrest shell 10 at this place is also fixed with a limit switch. At the same time, a pair of upper and lower distributed protective covers 100 are fixed at the opening of the placement cavity 13, and the upper shell 11 and the lower shell 12 form a step surface 19 with a low outside and a high inside at the opening of the placement cavity 13. The protective cover 100 is connected to the outer step surface 19 through a torsion spring. Such a design allows the protective cover 100 to be opened only from the inside of the placement cavity 13 to the outside, protecting the first wind knife 20 from being blocked by external debris.

[0061] In addition, a main air pipe 90 is fixed in the wiring placement cavity 13 of the gas pipeline, and a plurality of branch pipe joints 91 are arranged on the main air pipe 90. The branch pipe joints 91 are respectively connected to the first wind knife 20 and the second wind knife 30 through a hose 93. In order to ensure the uniformity of the blown air flow, a plurality of quick connectors are evenly spaced on the first wind knife 20 and the second wind knife 30. In order to facilitate the connection between the hose 93 and each joint, corresponding process holes are opened on the movable shell 60 and the armrest shell 10.

[0062] Another aspect of the present invention provides a security method, which uses one of the above-mentioned intelligent building security devices and includes the following steps:

[0063] Step 1: Detect smoke information through smoke sensors;

[0064] Step 2: The controller obtains the high-level signal triggered by the smoke sensor;

[0065] Step 3: The controller controls the direct-acting cylinder 81 to drag the first air knife 20 out of the placement cavity 13. At the same time, the flip mechanism drives the movable housing 60 to rotate through the rotating cylinder 80, driving the second air knife 30 to flip to a preset angle, and turns on the control light source assembly 50 to dynamically display the safety indication mark;

[0066] Step 4: After the movement reaches the designated position, the limit switch is triggered and the controller obtains the limit switch input signal;

[0067] Step 5: The controller output controls the air compressor 40 to start and open the solenoid valve, and the first air knife 20 and the second air knife 30 blow out airflow to form a wind wall area.

[0068] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. An intelligent building security device, which is used in the stairwell of a building, characterized in that: include: A handrail shell, the main body of which is a strip-shaped structure, is arranged parallel to the staircase and is fixed on the upper wall of the staircase; The first wind knife has a strip-shaped structure as its main body and is fixed along the armrest shell. A wind nozzle facing outward is formed on one side of the first wind knife. The airflow blown out by the first wind knife passes through the wind nozzle to form a first regional wind wall with a certain volume. A second wind knife, which has the same structure as the first wind knife and is fixed along the armrest shell, wherein the wind nozzle of the second wind knife forms a second area wind wall, and the second area wind wall and the first area wind wall form a continuous wind wall area; An air compressor is used to provide the airflow with a certain pressure to the first air knife and the second air knife; A light source assembly for displaying safety indication marks, the light source assembly being fixed on the armrest shell and being placed in the wind wall area; It also includes a smoke sensor and a controller. When the smoke sensor collects a smoke signal, the controller outputs and controls the actions of various components. It also includes a movable shell, the second wind knife is fixedly arranged on the movable shell, one side of the movable shell is rotatably connected to the armrest shell, and the second wind knife rotates with the movable shell.

2. The intelligent building security device according to claim 1, characterized in that: The armrest shell includes an upper shell, a lower shell and a back plate, the upper shell and the back plate are integrally formed, an accommodation cavity is formed between the upper shell and the lower shell, a receiving groove that cooperates with the movable shell is formed on one side of the top of the upper shell, and an arc-shaped lamp groove is formed on the other side, the light source assembly is installed in the arc-shaped lamp groove, and an arc-shaped lamp cover is fixed on the top of the arc-shaped lamp groove.

3. The intelligent building security device according to claim 2, characterized in that: A flip structure is provided at the bottom of the movable shell, and the flip structure includes a support shaft, a cam and a transmission gear. A plurality of cams are fixed on the support shaft, and the support shaft is rotatably arranged on the lower side of the movable shell. The end of the support shaft is linked to the rotating cylinder. The support shaft and the cam are placed in the placement cavity. The cam is provided with a continuous protrusion, and the outer ring of the cam is in contact with the bottom of the movable shell.

4. The intelligent building security device according to claim 3, characterized in that: The upper shell and the lower shell are fixed together by a plurality of I-shaped parts, a support ring is formed in the middle of the I-shaped parts, and the support shaft is coaxially rotatably connected to the support ring with a bearing.

5. The intelligent building security device according to claim 4, characterized in that: A slide groove is provided on the inner side surface of the accommodation cavity near its opening, and a slider is fixed on the first wind knife. The slider can be slidably fitted in the slide groove. The first wind knife moves with the slider, and its front end can extend to the outside of the accommodation cavity. A direct-acting cylinder is connected to the side of the first wind knife.

6. The intelligent building security device according to claim 5, characterized in that: A main air pipe is fixed in the placement cavity, and a plurality of branch pipe joints are arranged on the main air pipe. The branch pipe joints are respectively connected to the first air knife and the second air knife through hoses.

7. The intelligent building security device according to claim 6, characterized in that: The movable shell includes a first clamping plate, a second clamping plate, a connecting plate and a fixed plate. The fixed plate is fixed between the first clamping plate and the second clamping plate. An open clamping groove is formed between the relative inner sides of the fixed plate, the first clamping plate and the second clamping plate. The second wind knife is embedded in the clamping groove. The connecting plate is fixed to the outer sides of the first clamping plate and the second clamping plate. The side of the connecting plate away from the clamping groove is hingedly connected to the back plate.

8. The intelligent building security device according to claim 7, characterized in that: A pair of upper and lower protective covers are fixed at the opening of the placement cavity. The upper shell and the lower shell form a step surface with a lower outer side and a higher inner side at the opening of the placement cavity. The protective cover is connected to the outer step surface through a torsion spring.

9. A security method, according to the intelligent building security device of claim 8, characterized in that: The steps are as follows: Step 1: Detecting smoke information through the smoke sensor; Step 2: The controller obtains a high level signal triggered by the smoke sensor; Step 3: The controller controls the direct-acting cylinder to drag the first air knife out of the placement cavity. At the same time, the flip structure drags the second air knife to flip to a preset angle, and turns on the light source assembly to dynamically display the safety indication mark. Step 4: After the movement reaches the designated position, the limit switch is triggered and the controller obtains the limit switch input signal; Step 5: The controller output controls the air compressor to start and open the solenoid valve, and the first wind knife and the second wind knife blow out airflow to form the wind wall area.

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