Air tightness detection device for civil air defense door during closing

Abstract

The utility model discloses an air tightness detection device used when a civil defense door is closed, and relates to the civil defense door technology field, the air tightness detection device comprises a detection box, the inner cavity of the detection box is provided with a civil defense door, the bottom of the detection box is fixedly provided with four supporting legs in a rectangular array manner, and the bottom ends of the four supporting legs are fixedly provided with a fluorescent liquid storage box. A man-proof door control mechanism is arranged on the rear side of the fluorescent liquid storage box, a control box is fixedly installed at the bottom of the detection box, a two-way shaft motor is fixedly installed in the middle of an inner cavity of the control box, and threaded rods with opposite threads are fixedly installed on output shafts on the left side and the right side of the two-way shaft motor correspondingly; and movable plates are mounted on the outer walls of the two threaded rods in a threaded manner. According to the utility model, through mutual cooperation of the control box, the L-shaped clamping plate, the sealing rubber pad, the adjusting threaded rod, the adjusting placing plate and the clamping plate, clamping sealing detection can be carried out on civil air defense doors of different sizes, and the applicability of the air tightness detection device is improved.

Description

Technical Field

[0001] This utility model relates to the field of air defense door technology, specifically to an airtightness detection device for air defense doors when they are closed. Background Technology

[0002] Civil defense projects are air defense structures built to ensure the command, communication, and shelter of personnel and materials for civil air defense. In actual use, the airtightness of civil defense doors is subject to certain requirements, therefore, airtightness testing is necessary before the doors leave the factory. The following problems exist with existing technologies:

[0003] Chinese patent document CN217059208U discloses an airtightness testing device for air-raid shelter doors, relating to the technical field of air-raid shelter door testing equipment. It solves the problems of existing airtightness testing methods requiring manual operation, which is cumbersome, complex, and labor-intensive, and also fails to accurately locate the leakage point of the air-raid shelter door. This utility model includes a lifting mechanism for moving the airtightness testing chamber. A testing cavity is formed between the inner wall of the airtightness testing chamber and the air-raid shelter door. Several water immersion holes are provided on the upper side wall of the airtightness testing chamber, and a leak-fixing cardboard is placed at the bottom of the testing cavity. The beneficial effects of this utility model are: the leak-fixing cardboard allows for precise location of the leakage point of the air-raid shelter door while testing for airtightness; driven by a motor, cylinder, and electric suction cup, manual handling is eliminated, reducing labor intensity; the operation is convenient and quick; the experimental process is time-saving and labor-saving; and the degree of automation is high.

[0004] While the aforementioned literature suggests using an airtightness testing box to test airtightness doors, in actual testing, the varying sizes of airtightness doors compared to the fixed size of the testing box make it impossible to seal and test airtightness doors of different models and sizes. This results in low applicability of the overall device. Furthermore, although the literature suggests using a leak-proof cardboard to observe whether water drips onto the surface to determine the airtightness of the airtightness door, the cardboard needs to be removed and replaced if any liquid drips during the airtightness door test, leading to waste of the cardboard. Utility Model Content

[0005] This invention provides a device for detecting the airtightness of air defense doors when they are closed, in order to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A device for detecting the airtightness of a blast door when it is closed includes a detection box. The inner cavity of the detection box contains a blast door. Four support legs are fixedly mounted in a rectangular array at the bottom of the detection box. A fluorescent liquid storage tank is fixedly mounted at the bottom end of the four support legs. A blast door control mechanism is located at the rear of the fluorescent liquid storage tank. A control box is fixedly mounted at the bottom of the detection box. A bidirectional shaft motor is fixedly mounted in the center of the inner cavity of the control box. The left and right output shafts of the bidirectional shaft motor are each fixedly mounted with threaded rods of opposite threads. The outer wall is threaded with movable plates. Two L-shaped brackets are fixedly installed on the side of each movable plate away from the bidirectional shaft motor. An L-shaped clamp is fixedly installed at the top of the vertical part of each L-shaped bracket. The outer wall of the detection box has movable holes on both the left and right sides that penetrate its inner cavity. The horizontal parts of the two L-shaped clamps pass through the two movable holes to the inner cavity of the detection box. Sealing rubber gaskets are fixedly bonded to the opposite surfaces of the vertical parts of the two L-shaped clamps. The left and right sides of the air-raid shelter door overlap with the opposite surfaces of the two sealing rubber gaskets.

[0008] A further improvement of this utility model is that ultraviolet lamps are fixedly installed on both the left and right sides of the inner wall of the detection box, and the two ultraviolet lamps are respectively located below the two sealing rubber gaskets.

[0009] A further improvement of this utility model is that: adjusting threaded rods are movably installed on both the front and rear sides of the detection box, and knobs are fixedly installed on the other end of each of the two adjusting threaded rods; hanging plates are threadedly installed on the outer walls of each of the two adjusting threaded rods, and adjusting placement plates are fixedly installed on the bottom of each of the two hanging plates.

[0010] A further improvement of this utility model is that: the front and rear sides of the detection box are provided with movable holes 2 that penetrate its inner cavity; sealing rings are fixedly installed on the front and rear sides of the detection box; the two sealing rings are respectively connected to the two movable holes 2 in the front and rear; the opposite ends of the two adjustment placement plates respectively penetrate the two sealing rings and the movable holes 2 to the inner cavity of the detection box; and the tops of the two adjustment placement plates respectively overlap with the bottoms of the two L-shaped clamps.

[0011] A further improvement of this utility model is that: clamps are fixedly installed on the top of the two adjustment placement plates located in the inner cavity of the detection box, the opposite surfaces of the two clamps overlap with the front and rear sides of the air-raid shelter door respectively, and the tops of the two adjustment placement plates overlap with the bottom of the air-raid shelter door.

[0012] A further improvement of the present invention is that: a liquid pump is fixedly installed on the front side of the fluorescent liquid storage box, the output end of the liquid pump is fixedly connected to the inner cavity of the detection box, and a double-pass liquid suction pipe is fixedly connected to the input end of the liquid pump. Both input ends of the double-pass liquid suction pipe are fixedly connected to the upper front side of the detection box and penetrate its inner cavity.

[0013] A further improvement of this utility model is that: a second pump and a liquid addition pipe are fixedly installed on the right side of the fluorescent liquid storage box. The liquid addition pipe is located in front of the second pump and communicates with the inner cavity of the fluorescent liquid storage box. The input end of the second pump is fixedly connected to the inner cavity of the detection box. The output end of the second pump is fixedly connected to a liquid infusion pipe, and the output end of the liquid infusion pipe is located on the upper rear side of the detection box.

[0014] A further improvement of this utility model's technical solution is that: the air-raid shelter door control mechanism includes a fixed plate, which is fixedly installed on the rear side of the fluorescent liquid storage tank. A drive plate is fixedly installed on the rear side of the fixed plate. A sliding groove is provided on the top of the drive plate. A servo motor is fixedly installed on the left side of the drive plate. The output shaft of the servo motor passes through the inner cavity of the sliding groove and is fixedly installed with a translation threaded rod. A moving block is threadedly installed on the outer wall of the translation threaded rod. An L-shaped moving plate is fixedly installed on the top of the moving block. The horizontal position of the L-shaped moving plate is located above the detection box. An electric push rod is fixedly installed at the bottom of the horizontal position of the L-shaped moving plate. An electromagnetic chuck is fixedly installed at the output end of the electric push rod. The electromagnetic chuck is located on the top of the air-raid shelter door.

[0015] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0016] 1. This utility model provides an airtightness detection device for air defense doors when they are closed. Through the cooperation of the control box, L-shaped clamp, sealing rubber gasket, adjusting threaded rod, adjusting placement plate, and clamp, airtightness detection of air defense doors of different sizes can be performed, thereby improving the applicability of the airtightness detection device.

[0017] 2. This utility model provides an airtightness detection device for airtightness detection when a civil defense door is closed. Through the cooperation of a fluorescent liquid storage tank, a liquid pump, a liquid delivery pipe, and an ultraviolet lamp, if the airtightness of the civil defense door fails to meet the standard and fluorescent liquid drips to the bottom of the detection tank, it can be directly detected by ultraviolet light after the civil defense door is removed. It can also be wiped clean after the test, eliminating the need to repeatedly replace the leak-proof cardboard and preventing the small amount of liquid dripping on the cardboard from going undetected. This improves the accuracy of the test and reduces the cost of replacing the cardboard. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a cross-sectional view of the control box of this utility model.

[0020] Figure 3 This is a schematic diagram of the detection box structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the fluorescent liquid storage box of this utility model;

[0022] Figure 5 This is a schematic diagram of the air defense door control mechanism of this utility model.

[0023] In the diagram: 1. Detection box; 11. Support leg; 12. Control box; 121. Bidirectional shaft motor; 122. Threaded rod; 123. Moving plate; 124. L-shaped bracket; 13. L-shaped clamp; 14. Sealing rubber gasket; 15. Moving hole one; 16. Ultraviolet lamp; 17. Adjusting threaded rod; 171. Knob; 172. Hanging plate; 173. Adjusting placement plate; 174. Clamp; 18. Moving hole two; 81. Sealing ring; 2. Air raid shelter door; 3. Fluorescent liquid storage tank; 31. Pump 1; 32. Double-pass pump pipe; 33. Pump 2; 34. Infusion pipe; 35. Liquid filling pipe; 4. Air raid shelter door control mechanism; 41. Fixing plate; 42. Drive plate; 43. Slide groove; 44. Servo motor; 45. Translation threaded rod; 46. Moving block; 47. L-shaped moving plate; 48. Electric push rod; 49. Electromagnetic chuck. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0025] like Figure 1 , Figure 2 , Figure 3As shown, this utility model provides an airtightness detection device for air defense doors when closed, including a detection box 1. An air defense door 2 is installed inside the detection box 1. Four support legs 11 are fixedly mounted in a rectangular array at the bottom of the detection box 1. A fluorescent liquid storage tank 3 is fixedly mounted at the bottom end of the four support legs 11. An air defense door control mechanism 4 is located at the rear of the fluorescent liquid storage tank 3. A control box 12 is fixedly mounted at the bottom of the detection box 1. A bidirectional shaft motor 121 is fixedly mounted in the middle of the inner cavity of the control box 12. Threaded rods 122 with opposite threads are fixedly mounted on the left and right output shafts of the bidirectional shaft motor 121. The outer walls of the two threaded rods 122 are threaded with movable plates 123. Two L-shaped brackets 124 are fixedly installed on the side of each movable plate 123 away from the bidirectional shaft motor 121. L-shaped clamping plates 13 are fixedly installed at the top vertical points of the two L-shaped brackets 124. Movable holes 15 penetrating the inner cavity are opened on both the left and right sides of the outer wall of the detection box 1. The horizontal points of the two L-shaped clamping plates 13 penetrate the two movable holes 15 to the inner cavity of the detection box 1. Sealing rubber gaskets 14 are fixedly bonded to the opposite vertical surfaces of the two L-shaped clamping plates 13. The left and right sides of the air-raid shelter door 2 are respectively... The two sealing rubber gaskets 14 overlap with each other. Ultraviolet lamps 16 are fixedly installed on both the left and right sides of the inner wall of the test chamber 1. The two ultraviolet lamps 16 are located below the two sealing rubber gaskets 14. Adjustable threaded rods 17 are movably installed on both the front and rear sides of the test chamber 1. A knob 171 is fixedly installed at the other end of each of the two adjusting threaded rods 17. Hanging plates 172 are threaded onto the outer walls of each of the two adjusting threaded rods 17. Adjustable placement plates 173 are fixedly installed at the bottom of each of the two hanging plates 172. Moving holes 18 penetrating the inner cavity are opened on both the front and rear sides of the test chamber 1. Both sides are fixedly installed with sealing rings 181. The two sealing rings 181 are respectively connected to the two moving holes 18. The opposite ends of the two adjusting placement plates 173 pass through the two sealing rings 181 and the moving holes 18 to the inner cavity of the detection box 1. The tops of the two adjusting placement plates 173 overlap with the bottoms of the two L-shaped clamps 13. The tops of the two adjusting placement plates 173 located in the inner cavity of the detection box 1 are fixedly installed with clamps 174. The opposite sides of the two clamps 174 overlap with the front and rear sides of the air defense door 2. The tops of the two adjusting placement plates 173 overlap with the bottom of the air defense door 2.

[0026] When the air-raid shelter door 2 needs to be placed for testing, simply place the air-raid shelter door 2 on top of the two adjusting placement plates 173 located inside the testing box 1. Then, simultaneously rotate the two knobs 171 to drive the two adjusting threaded rods 17 to rotate. The threaded connection between the hanging plate 172 and the adjusting threaded rods 17 controls the adjusting placement plates 173 to move through the sealing ring 181 and the second moving hole 18 into the inner cavity of the testing box 1 until the clamping plate 174 stops against the left and right sides of the air-raid shelter door 2, thus fixing the air-raid shelter door 2 in the front-back direction. Then, start the bidirectional shaft motor 121 inside the control box 12 to drive the two left and right rods. The rotating of the threaded walls with opposite threads, along with the threaded connection between the movable plate 123 and the threaded rod 122, controls the movement of the two L-shaped brackets 124, causing them to move closer together. This moves the two L-shaped clamping plates 13 horizontally through the movable hole 15 into the inner cavity of the testing box 1. The sealing rubber gasket 14, which is fixed and bonded at its vertical position, clamps and fixes the left and right sides of the air-raid shelter door 2, improving its sealing performance. When fluorescent liquid leaks down, it can be visually displayed by the illumination of the ultraviolet lamp 16, allowing for a quick determination of whether the airtightness of the air-raid shelter door 2 is up to standard. After the test, the fluorescent liquid that dripped onto the bottom of the inner cavity of the testing box 1 can be wiped away directly.

[0027] like Figure 4 As shown, a first pump 31 is fixedly installed on the front side of the fluorescent liquid storage box 3. The output end of the first pump 31 is fixedly connected to the inner cavity of the detection box 1. A double-pass pumping pipe 32 is fixedly connected to the input end of the first pump 31. Both input ends of the double-pass pumping pipe 32 are fixedly connected to the upper front side of the detection box 1 and are connected to its inner cavity. A second pump 33 and a liquid adding pipe 35 are fixedly installed on the right side of the fluorescent liquid storage box 3. The liquid adding pipe 35 is located in front of the second pump 33 and is connected to the inner cavity of the fluorescent liquid storage box 3. The input end of the second pump 33 is fixedly connected to the inner cavity of the detection box 1. An infusion pipe 34 is fixedly connected to the output end of the second pump 33. The output end of the infusion pipe 34 is located on the upper rear side of the detection box 1.

[0028] By activating the second pump 33, the fluorescent liquid injected into the inner cavity of the fluorescent liquid storage tank 3 in advance through the liquid filling pipe 35 can be extracted and injected into the inner cavity of the detection box 1 through the infusion pipe 34. The output end of the infusion pipe 34 can be set in the direction close to the clamp plate 174, so that the fluorescent liquid can be injected above the air-raid shelter door 2. At the same time, the remaining fluorescent liquid at the top of the air-raid shelter door 2 can be extracted from the front and rear sides of the air-raid shelter door 2 by activating the first pump 31 and using the double-pass liquid extraction pipe 32, and then re-injected into the inner cavity of the fluorescent liquid storage tank 3, so that the air-raid shelter door 2 can be easily removed from the inner cavity of the detection box 1.

[0029] like Figure 5As shown, the air defense door control mechanism 4 includes a fixed plate 41, which is fixedly installed on the rear side of the fluorescent liquid storage tank 3. A drive plate 42 is fixedly installed on the rear side of the fixed plate 41. A slide groove 43 is opened on the top of the drive plate 42. A servo motor 44 is fixedly installed on the left side of the drive plate 42. The output shaft of the servo motor 44 passes through the inner cavity of the slide groove 43 and is fixedly installed with a translation threaded rod 45. A moving block 46 is threaded on the outer wall of the translation threaded rod 45. An L-shaped moving plate 47 is fixedly installed on the top of the moving block 46. The horizontal position of the L-shaped moving plate 47 is located above the detection box 1. An electric push rod 48 is fixedly installed at the bottom of the horizontal position of the L-shaped moving plate 47. An electromagnetic chuck 49 is fixedly installed at the output end of the electric push rod 48. The electromagnetic chuck 49 is located on the top of the air defense door 2. Both the electric push rod 48 and the electromagnetic chuck 49 can be powered by an external power supply through a long wire, so as not to affect the movement.

[0030] When it is necessary to remove the air-raid shelter door 2, the electric push rod 48 can be activated to drive the electromagnetic chuck 49 to descend, and the electromagnetic chuck 49 can be used to firmly hold the air-raid shelter door 2. Then, the electric push rod 48 can be activated to drive the entire air-raid shelter door 2 to rise until it is higher than the detection box 1. Then, the servo motor 44 can be activated to drive the translation threaded rod 45 in the slide groove 43 of the drive plate 42 to rotate. By using the threaded connection between the translation threaded rod 45 and the moving block 46, the L-shaped moving plate 47 at the top of the moving block 46 can be controlled to move to the left, thereby removing the air-raid shelter door 2. Similarly, the air-raid shelter door 2 can be adsorbed and placed into the inner cavity of the detection box 1, improving the efficiency of picking and placing. The sealing between the bottom of the air-raid shelter door 2 and the top of the adjusting placement plate 173 can be improved by pressing down the electromagnetic chuck 49.

[0031] The working principle of the airtightness detection device used when the airtightness of the air-raid shelter door is closed will be explained in detail below.

[0032] like Figure 1-5As shown, when the air-raid shelter door 2 needs to be placed for testing, simply place the air-raid shelter door 2 on top of the two adjusting placement plates 173 located inside the testing box 1. Then, simultaneously rotate the two knobs 171 to drive the two adjusting threaded rods 17 to rotate. By using the threaded connection between the hanging plate 172 and the adjusting threaded rods 17, the adjusting placement plate 173 can be controlled to move through the sealing ring 181 and the second moving hole 18 into the inner cavity of the testing box 1 until the clamping plate 174 stops against the left and right sides of the air-raid shelter door 2, thus completing the fixation of the air-raid shelter door 2 in the front-back direction. Then, start the bidirectional shaft motor 121 inside the control box 12 to drive the left and right threaded rods. The reverse threaded wall rotation, through the threaded connection between the movable plate 123 and the threaded rod 122, controls the two L-shaped brackets 124 to move closer together, causing the two L-shaped clamping plates 13 to move horizontally through the movable hole 15 into the inner cavity of the detection box 1. The sealing rubber gasket 14, which is fixed and bonded at its vertical position, clamps and fixes the left and right sides of the air defense door 2, improving the sealing performance. At this time, the liquid pump 33 can be started to extract the fluorescent liquid that has been injected into the inner cavity of the fluorescent liquid storage tank 3 in advance through the liquid filling pipe 35, and inject it into the inner cavity of the detection box 1 through the infusion pipe 34. The output end of the infusion pipe 34 can be set in the direction close to the clamping plate 174. This allows the fluorescent liquid to be injected above the air-raid shelter door 2. When any fluorescent liquid leaks, it can be visually displayed by the ultraviolet lamp 16, quickly determining whether the airtightness of the air-raid shelter door 2 is up to standard. After testing, the fluorescent liquid dripping to the bottom of the inner cavity of the testing chamber 1 can be wiped away directly. Meanwhile, any remaining fluorescent liquid at the top of the air-raid shelter door 2 can be extracted from both sides of the door 2 by activating the pump 31 and using the double-pass extraction pipe 32, and then re-injected into the inner cavity of the fluorescent liquid storage tank 3. This facilitates the removal of the air-raid shelter door 2 from the inner cavity of the testing chamber 1. During removal, the electromagnetic chuck 49 can be lowered by activating the electric push rod 48, using the electromagnetic chuck... The plate 49 firmly holds the air-raid shelter door 2, and then the electric push rod 48 is activated to drive the entire air-raid shelter door 2 to rise until it is higher than the detection box 1. Then the servo motor 44 is activated to drive the translation thread rod 45 in the slide groove 43 of the drive plate 42 to rotate. By using the threaded connection between the translation thread rod 45 and the moving block 46, the L-shaped moving plate 47 at the top of the moving block 46 can be controlled to move to the left, thereby moving the air-raid shelter door 2 out. Similarly, the air-raid shelter door 2 can be adsorbed and placed into the inner cavity of the detection box 1, improving the efficiency of picking and placing. The sealing between the bottom of the air-raid shelter door 2 and the top of the adjusting placement plate 173 can be improved by the downward pressure of the electromagnetic chuck 49.

[0033] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A device for detecting the air tightness of a civil air defense door when it is closed, comprising a detection box (1), characterized in that: The inner cavity of the detection box (1) is equipped with a fire-resistant door (2). Four support legs (11) are fixedly installed in a rectangular array at the bottom of the detection box (1). A fluorescent liquid storage tank (3) is fixedly installed at the bottom end of the four support legs (11). A fire-resistant door control mechanism (4) is provided on the rear side of the fluorescent liquid storage tank (3). A control box (12) is fixedly installed at the bottom of the detection box (1). A bidirectional shaft motor (121) is fixedly installed in the middle of the inner cavity of the control box (12). The left and right output shafts of the bidirectional shaft motor (121) are both fixedly equipped with threaded rods (122) with opposite threads. The outer walls of the two threaded rods (122) are threaded with movable plates (123). Two L-shaped brackets (124) are fixedly installed on the side of the two movable plates (123) away from the bidirectional shaft motor (121), and L-shaped clamps (13) are fixedly installed at the top of the vertical part of the two L-shaped brackets (124). The outer wall of the detection box (1) has movable holes (15) that penetrate its inner cavity on both the left and right sides. The horizontal parts of the two L-shaped clamps (13) penetrate the two movable holes (15) to the inner cavity of the detection box (1), and the vertical opposite surfaces of the two L-shaped clamps (13) are fixedly bonded with sealing rubber gaskets (14). The left and right sides of the air defense door (2) overlap with the opposite surfaces of the two sealing rubber gaskets (14).

2. The air tightness detection device for the closed civil defense door according to claim 1, characterized in that: Ultraviolet lamps (16) are fixedly installed on both the left and right sides of the inner wall of the detection box (1), and the two ultraviolet lamps (16) are located below the two sealing rubber pads (14).

3. The air tightness detection device for the closed civil defense door according to claim 1, characterized in that: The front and rear sides of the test box (1) are movably installed with adjusting threaded rods (17), and the other ends of the two adjusting threaded rods (17) are fixedly installed with knobs (171). The outer walls of the two adjusting threaded rods (17) are threadedly installed with hanging plates (172), and the bottoms of the two hanging plates (172) are fixedly installed with adjusting placement plates (173).

4. The air tightness detection device for the closed civil defense door according to claim 3, characterized in that: The front and rear sides of the test box (1) are provided with movable holes (18) that penetrate its inner cavity. Sealing rings (181) are fixedly installed on the front and rear sides of the test box (1). The two sealing rings (181) are respectively connected to the two movable holes (18) in the front and rear. The opposite ends of the two adjustment placement plates (173) pass through the two sealing rings (181) and the movable holes (18) to the inner cavity of the test box (1). The tops of the two adjustment placement plates (173) overlap with the bottoms of the two L-shaped clamps (13).

5. The air tightness detection device for the closed civil defense door according to claim 4, characterized in that: The two adjustment placement plates (173) are fixedly installed with clamps (174) on the top of the inner cavity of the detection box (1). The opposite sides of the two clamps (174) overlap with the front and rear sides of the air defense door (2), and the top of the two adjustment placement plates (173) overlaps with the bottom of the air defense door (2).

6. The air tightness detection device for the closed civil defense door according to claim 1, characterized in that: A liquid pump (31) is fixedly installed on the front side of the fluorescent liquid storage box (3). The output end of the liquid pump (31) is fixedly connected to the inner cavity of the detection box (1). A double-pass liquid pumping pipe (32) is fixedly connected to the input end of the liquid pump (31). Both input ends of the double-pass liquid pumping pipe (32) are fixedly connected to the upper front side of the detection box (1) and pass through its inner cavity.

7. The air tightness detection device for the closed civil defense door according to claim 6, characterized in that: A second pump (33) and a liquid addition pipe (35) are fixedly installed on the right side of the fluorescent liquid storage tank (3). The liquid addition pipe (35) is located in front of the second pump (33) and communicates with the inner cavity of the fluorescent liquid storage tank (3). The input end of the second pump (33) is fixedly connected to the inner cavity of the detection box (1). The output end of the second pump (33) is fixedly connected to a delivery pipe (34). The output end of the delivery pipe (34) is located above and behind the detection box (1).

8. The air tightness detection device for the closed civil defense door according to claim 1, characterized in that: The air defense door control mechanism (4) includes a fixing plate (41), which is fixedly installed on the rear side of the fluorescent liquid storage tank (3). A drive plate (42) is fixedly installed on the rear side of the fixing plate (41). A slide groove (43) is provided on the top of the drive plate (42). A servo motor (44) is fixedly installed on the left side of the drive plate (42). The output shaft of the servo motor (44) passes through the inner cavity of the slide groove (43) and a translation threaded rod (45) is fixedly installed thereon. The outer wall of the translation threaded rod (45) is threaded with a moving block (46), and the top of the moving block (46) is fixedly installed with an L-shaped moving plate (47). The horizontal part of the L-shaped moving plate (47) is located above the detection box (1). The bottom of the horizontal part of the L-shaped moving plate (47) is fixedly installed with an electric push rod (48). The output end of the electric push rod (48) is fixedly installed with an electromagnetic chuck (49). The electromagnetic chuck (49) is located at the top of the air-raid shelter door (2).

Images