People's defense door for basement

Abstract

The invention relates to the technical field of civil defense doors and discloses a basement civil defense door which comprises a door frame and a door body mounted in the door frame and further comprises a guide rail mounted at the top end of the inner side of the door frame and a doorsill mounted at the bottom end of the door frame. The door frame and the door body are arranged, the guide rail is arranged at the top end of the inner side of the door frame, the guide rail can guide the opening and closing track of the door body, the guide rail comprises the transverse part, the inclined part and the vertical part, and the door body can be guided by the guide rail to vertically, obliquely and transversely move in the opening and closing process; compared with a traditional civil air defense door hinge opening and closing mode, the horizontal sliding opening and closing mode can reduce the space needed by opening and closing of the door body, and therefore it can be guaranteed that opening and closing of the door body are not affected by the outside world.

Description

Technical Field

[0001] The present invention relates to the technical field of civil air defense doors, and in particular to a civil air defense door for a basement. Background Art

[0002] Civil defense, also known as civil defense, is the government's mobilization and organization of the masses to take anti-air raid, disaster relief measures, implement rescue operations, and prevent and reduce disaster hazards. The civil defense door is the door at the entrance and exit of the people's defense project.

[0003] For example, a civil defense door for a basement with publication number CN118292731A includes: a door body, used to close the basement; a hand wheel, used to operate the door lock to fix the door body to the door frame; a pad, provided at the bottom of the door body; a sealing block, provided on the pad; a positioning frame, provided at the bottom of the pad; the sealing block is made of rubber, the sealing block can move in the positioning frame, and the positioning frame and the pad are seamlessly connected; the present invention can also provide a good sealing effect during a fire.

[0004] There are some problems in the actual application of the above technical solution. The civil air defense door should remain open when no disaster occurs. However, the civil air defense door in the above technical solution has a large opening and closing range, and is easily blocked when it needs to be closed, resulting in an inability to close quickly. In addition, in order to prevent the bottom of the door frame of the civil air defense door from affecting the passage of pedestrians and vehicles, no threshold is set at the bottom of the civil air defense door, which causes the bottom of the civil air defense door to be insufficiently sealed when closed.

[0005] Therefore, it is necessary to invent a basement air defense door to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide a human-defense door for a basement to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: a human-defense door for a basement, comprising a door frame and a door body installed inside the door frame, and also comprising a guide rail installed at the top inner side of the door frame and a threshold installed at the bottom end of the door frame; The door frame is configured as a square structure, a sealing frame is fixedly mounted on the inner wall of the door frame, and a sliding groove is provided at the inner bottom end of the door frame; An extension frame is fixedly installed on the inner side of the door body, and the extension frame corresponds to the inner side wall of the door frame. A sealing groove is opened on the outer side wall of the door body, and the sealing groove corresponds to the sealing frame. A locking assembly is installed on the inner side of the door body. The guide rail is used to guide the sliding track of the door body. The guide rail includes two groups of horizontal parts, inclined parts and vertical parts arranged in sequence horizontally. The middle parts of the horizontal parts, inclined parts and vertical parts are all penetrated with guide grooves. A guide rod is slidably installed inside the guide groove. A guide wheel is installed at the top of the guide rod, and the guide wheel is slidably installed inside the guide rail. A fixed seat is rotatably installed at the bottom end of the guide rod, and the fixed seat is fixedly installed at the top of the door body. The threshold is slidably installed inside the slide groove, and the top end of the threshold corresponds to the bottom end of the door body. An adjusting component is installed between the threshold and the door frame.

[0008] Preferably, the locking assembly is used to lock the position between the door body and the door frame, and the locking assembly includes a driving seat, a transmission arm, a movable arm, a rotating shaft, a transmission seat, a transmission rod and a locking rod. The driving seat is slidably installed on the inner side of the door body, the two transmission arms are respectively rotatably installed on the two ends of the driving seat, the two movable arms are respectively rotatably installed on one end of the two transmission arms, the two rotating shafts are respectively rotatably installed on one end of the two movable arms, and the two rotating shafts are fixedly installed on the inner side of the door body, the two transmission seats are respectively fixedly installed on one end of the two movable arms, the four transmission rods are respectively rotatably installed on the two ends of the two transmission seats, the four locking rods are respectively rotatably installed on one end of the four transmission rods, and the four locking rods are respectively installed at the four inner corners of the door body.

[0009] Preferably, the locking assembly also includes a limiting sleeve and a locking sleeve, the four limiting sleeves are respectively fixedly installed at the four inner corners of the door body, and the four limiting sleeves are respectively sleeved and installed in the middle of the four locking rods, the four locking sleeves are respectively fixedly installed at the inner top end of the door frame and the inner side of the door sill, and the four limiting sleeves correspond to the four locking rods respectively.

[0010] Preferably, a screw slot is provided through the middle of the driving seat, a locking screw is installed through the inside of the screw slot, a support seat is rotatably installed on the bottom end of the locking screw, and the support seat is fixedly installed on the inner side of the door body, a driving rod is installed on the top end of the locking screw, and a transmission bevel gear set is installed between the driving rod and the locking screw, and hand wheels are fixedly installed on both ends of the driving rod.

[0011] Preferably, the adjusting assembly is used to adjust the height of the threshold so that it fits and seals with the bottom end of the door body, and the adjusting assembly includes a slot, a connecting slot, a square slot, a swing arm, a rocker arm, a pressure block and a connecting rod, the slot is opened on the inner wall of the door frame, the connecting slot is opened at the slot bottom of the slot, the square slot passes through the bottom end of the inner wall of the connecting slot, and one end of the square slot extends to the interior of the slide slot, the swing arm is installed inside the square slot, and one end of the swing arm is installed below the threshold, the rocker arm is fixedly installed on one end of the swing arm, the pressure block is installed inside the slot, and the connecting rod is installed between the pressure block and the rocker arm.

[0012] Preferably, a support is fixedly installed between the rocker arm and the swing arm, and the support is rotatably installed inside the square groove.

[0013] Preferably, a sliding sleeve is fixedly installed on the inner side of the pressing block, and the sliding sleeve is slidably installed on the top end of the connecting rod. An arc surface is provided on the outer side of the pressing block, and the door body can slide the pressing block into the slot by squeezing the arc surface.

[0014] Preferably, a connecting seat is fixedly mounted on the bottom end of the connecting rod, and the connecting seat is rotatably mounted on the top end of the rocker arm.

[0015] Preferably, grooves are provided at both ends of the lower surface of the door sill, and the top end of the swing arm is slidably mounted inside the groove.

[0016] Preferably, a plurality of reinforcing ribs are installed around the outer side wall of the door frame, and the top of the door sill is flush with the basement floor when the door sill is located at the bottom end of the slide groove.

[0017] Technical effects and advantages of the present invention: 1. The present invention sets a door frame and a door body, and a guide rail is set at the inner top of the door frame. The guide rail can guide the opening and closing trajectory of the door body. The guide rail includes a horizontal part, an inclined part and a vertical part. The door body can be guided by the guide rail to perform vertical, inclined and horizontal movements during the opening and closing process, so that the door body can be vertically inserted or slid out of the door frame and then slide horizontally. Compared with the traditional civil air defense door hinge opening and closing method, the horizontal sliding opening and closing method can reduce the space required for the door body to open and close, thereby ensuring that the opening and closing of the door body is not affected by the outside world; 2. The present invention provides a threshold that can slide up and down at the bottom of the door frame. When the door body is opened, the threshold can slide down and be flush with the ground without affecting the passage of vehicles and pedestrians. When the door body is closed, the threshold can be lifted up and sealed with the bottom of the door body to ensure the sealing effect of the civil air defense door. A swing arm, a rocker arm, a pressure block and a connecting rod are provided between the threshold and the door frame. The swing arm and the rocker arm form a rotatable "L"-shaped structure. The pressure block can be squeezed when the door body is closed to drive the connecting rod to slide, and the connecting rod can drive the "L"-shaped structure to rotate, so as to realize the automatic lifting and lowering of the threshold, thereby facilitating the use of the civil air defense door. 3. The present invention arranges four locking rods on the inner side of the door body, and the four locking rods can respectively cooperate with the locking sleeves installed on the inner side of the door frame and the door sill to achieve locking between the door body and the door frame. A driving seat, a transmission arm, a movable arm, a transmission seat and a transmission rod are arranged between the four locking rods. The driving seat can adjust the position through the locking screw, and the driving seat can drive the transmission seat to rotate through the transmission arm and the movable arm. The transmission seat drives the locking rod to move through the transmission rod to achieve rapid adjustment of the positions of the four locking rods, so as to achieve rapid closing and locking of the civil air defense door. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure installation state of the present invention.

[0019] Figure 2 It is a schematic diagram of the overall structure of the present invention in an opened state after installation.

[0020] Figure 3 It is a schematic diagram of the overall structure of the present invention in an open state.

[0021] Figure 4 It is a schematic diagram of the closed state of the overall structure of the present invention.

[0022] Figure 5 It is a schematic top view of the overall structure of the present invention.

[0023] Figure 6 It is a schematic diagram of the door structure of the present invention.

[0024] Figure 7 It is a side schematic diagram of the door structure of the present invention.

[0025] Figure 8 It is a schematic cross-sectional view of the door frame and door body structure of the present invention.

[0026] Fig. 9 It is a schematic diagram of the threshold structure of the present invention.

[0027] Fig.10 It is a schematic diagram of the door frame structure of the present invention.

[0028] In the figure: 1, door frame; 2, door body; 3, guide rail; 4, threshold; 101, sealing frame; 11, slide groove; 12, slot; 13, connecting groove; 14, square groove; 15, swing arm; 16, rocker arm; 161, support; 17, pressure block; 171, sliding sleeve; 172, arc surface; 18, connecting rod; 181, connecting seat; 201, extension frame; 202, sealing groove; 21, driving seat; 211, screw rod groove; 212 , locking screw; 213, supporting seat; 214, driving rod; 215, transmission bevel gear set; 22, transmission arm; 23, movable arm; 24, rotating shaft; 25, transmission seat; 26, transmission rod; 27, locking rod; 28, limiting sleeve; 29, locking sleeve; 301, transverse part; 302, inclined part; 303, vertical part; 31, guide groove; 32, guide rod; 33, guide wheel; 34, fixed seat; 41, groove. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0030] The present invention provides Figures 1 to 10 The illustrated basement air-raid door comprises a door frame 1 and a door body 2 installed inside the door frame 1, a guide rail 3 installed at the top inner side of the door frame 1, and a threshold 4 installed at the bottom end of the door frame 1; The door frame 1 is set to a square structure, a sealing frame 101 is fixedly installed on the inner wall of the door frame 1, a sliding groove 11 is opened at the inner bottom end of the door frame 1, and a plurality of reinforcing ribs are installed around the outer wall of the door frame 1; An extension frame 201 is fixedly installed on the inner side of the door body 2, and the extension frame 201 corresponds to the inner side wall of the door frame 1. A sealing groove 202 is opened on the outer side wall of the door body 2, and the sealing groove 202 corresponds to the sealing frame 101. A locking assembly is installed on the inner side of the door body 2; The locking assembly is used to lock the position between the door body 2 and the door frame 1. The locking assembly includes a driving seat 21, a transmission arm 22, a movable arm 23, a rotating shaft 24, a transmission seat 25, a transmission rod 26 and a locking rod 27. The driving seat 21 is slidably mounted on the inner side of the door body 2, the two transmission arms 22 are respectively rotatably mounted on the two ends of the driving seat 21, the two movable arms 23 are respectively rotatably mounted on one end of the two transmission arms 22, the two rotating shafts 24 are respectively rotatably mounted on one end of the two movable arms 23, and the two rotating shafts 24 are both fixedly mounted on the inner side of the door body 2, the two transmission seats 25 are respectively fixedly mounted on one end of the two movable arms 23, the four transmission rods 26 are respectively rotatably mounted on the two ends of the two transmission seats 25, the four locking rods 27 are respectively rotatably mounted on one end of the four transmission rods 26, and the four locking rods 27 are respectively mounted at the four inner corners of the door body 2; The locking assembly further includes a limiting sleeve 28 and a locking sleeve 29. The four limiting sleeves 28 are respectively fixedly mounted at the four inner corners of the door body 2, and the four limiting sleeves 28 are respectively sleeved and mounted on the middle of the four locking rods 27. The four locking sleeves 29 are respectively fixedly mounted on the inner top of the door frame 1 and the inner side of the threshold 4, and the four limiting sleeves 28 correspond to the four locking rods 27. In addition, a screw rod groove 211 is provided in the middle of the driving seat 21, a locking screw rod 212 is installed in the screw rod groove 211, a support seat 213 is rotatably installed at the bottom end of the locking screw rod 212, and the support seat 213 is fixedly installed on the inner side of the door body 2, a driving rod 214 is installed at the top end of the locking screw rod 212, and a transmission bevel gear set 215 is installed between the driving rod 214 and the locking screw rod 212, and hand wheels are fixedly installed at both ends of the driving rod 214, and the two hand wheels are respectively installed on both sides of the door body 2, so as to facilitate the opening of the civil air defense door; Moreover, the guide rail 3 is used to guide the sliding track of the door body 2. The guide rail 3 includes two groups of horizontal parts 301, inclined parts 302 and vertical parts 303 which are arranged horizontally in sequence. The middle parts of the horizontal part 301, the inclined part 302 and the vertical part 303 are all penetrated with a guide groove 31. A guide rod 32 is slidably installed inside the guide groove 31. A guide wheel 33 is installed at the top of the guide rod 32, and the guide wheel 33 is slidably installed inside the guide rail 3. A fixed seat 34 is rotatably installed at the bottom end of the guide rod 32, and the fixed seat 34 is fixedly installed at the top of the door body 2. Two groups of the fixed seat 34 and the guide wheel 33 are provided, and the lengths of the two groups of fixed seats 34 are different to adapt to the two groups of horizontal parts 301, the inclined part 302 and the vertical part 303, thereby ensuring that the door body 2 can slide on the outside of the door frame 1. The threshold 4 is slidably installed inside the slide groove 11, and the top of the threshold 4 corresponds to the bottom of the door body 2. An adjustment component is installed between the threshold 4 and the door frame 1. When the threshold 4 is located at the bottom of the slide groove 11, its top is flush with the basement floor. The adjusting assembly is used to adjust the height of the threshold 4 so that it fits and seals with the bottom end of the door body 2. The adjusting assembly includes a slot 12, a connecting slot 13, a square slot 14, a swing arm 15, a rocker arm 16, a pressing block 17 and a connecting rod 18. The slot 12 is arranged on the inner wall of the door frame 1, the connecting slot 13 is arranged on the bottom of the slot 12, the square slot 14 passes through the bottom end of the inner wall of the connecting slot 13, and one end of the square slot 14 extends to the inside of the slide slot 11, the swing arm 15 is installed inside the square slot 14, and one end of the swing arm 15 is installed below the threshold 4, the rocker arm 16 is fixedly installed on one end of the swing arm 15, the pressing block 17 is installed inside the slot 12, and the connecting rod 18 is installed between the pressing block 17 and the rocker arm 16; In addition, a support 161 is fixedly installed between the rocker arm 16 and the swing arm 15, and the support 161 is rotatably installed inside the square groove 14. The setting of the support 161 allows the rocker arm 16 and the swing arm 15 to rotate; Moreover, a sliding sleeve 171 is fixedly installed on the inner side of the pressing block 17, and the sliding sleeve 171 is slidably installed on the top of the connecting rod 18. An arc surface 172 is provided on the outer side of the pressing block 17. The door body 2 can slide the pressing block 17 into the slot 12 by squeezing the arc surface 172. At the same time, a connecting seat 181 is fixedly installed at the bottom end of the connecting rod 18, and the connecting seat 181 is rotatably installed at the top end of the rocker arm 16. The connecting rod 18 can slide horizontally with the sliding sleeve 171 and the pressing block 17 to drive the rocker arm 16 to rotate; Grooves 41 are provided at both ends of the lower surface of the door sill 4 , and the top end of the swing arm 15 is slidably installed inside the groove 41 . The swing arm 15 can drive the door sill 4 to move upward by squeezing the top end of the groove 41 .

[0031] To sum up, in actual application, the present device can be opened and closed by pushing the door body 2 so that the door body 2 slides under the guidance of the guide rail 3, and when the door body 2 moves to the inside of the door frame 1, the threshold 4 can rise up and fit tightly with the bottom end of the door body 2 to ensure the sealing effect of the civil air defense door after closing. After the door body 2 moves to the inside of the door frame 1, the four locking rods 27 on the inner side of the door body 2 cooperate with the locking sleeves 29 on the inner sides of the door frame 1 and the threshold 4 to achieve complete locking of the door body 2 to ensure the stability of the civil air defense door after closing. When the door body 2 slides along the guide rail 3, the guide wheel 33 at the top of the door body 2 can slide inside the guide rail 3, and the guide rod 32 can slide in the guide groove 31. During this process, the guide rod 32 moves along the horizontal portion 301, the inclined portion 302 and the vertical portion 303 in sequence. When the guide rod 32 moves along the vertical portion 303, the door body 2 moves vertically relative to the door frame 1, so that the door body 2 is inserted into or slides out of the door frame 1. When the guide rod 32 slides along the inclined portion 302, the door body 2 moves away from the door frame 1. When the guide rod 32 slides along the horizontal portion 301, the door body 2 moves away from the door frame 1 horizontally, so as to achieve complete separation of the door body 2 from the door frame 1. When the door body 2 is inserted into the door frame 1, the two sides of the door body 2 squeeze the arcuate surfaces 172 on the outer sides of the two pressing blocks 17, so that the pressing blocks 17 slide into the slots 12, and the pressing blocks 17 drive the connecting rod 18 to slide horizontally through the sliding sleeve 171, and the connecting rod 18 drives the top end of the rocker arm 16 to move through the connecting seat 181, so that the rocker arm 16 and the swing arm 15 rotate around the support 161, and at this time, one end of the swing arm 15 squeezes the door sill 4 upward, so that the door sill 4 is lifted upward and fits tightly with the bottom end of the door body 2; When adjusting the position of the locking rod 27 to lock the door body 2, turn the handwheel at one end of the driving rod 214 so that the driving rod 214 drives the locking screw 212 to rotate through the transmission bevel gear set 215. The locking screw 212 cooperates with the screw groove 211 to drive the driving seat 21 to move downward. The driving seat 21 drives the movable arm 23 to move through the transmission arm 22, so that the movable arm 23 rotates around the rotating shaft 24, and the movable arm 23 can drive the transmission seat 25 to rotate, and the transmission seat 25 drives the transmission rod 26 to rotate, and the transmission rod 26 drives the locking rod 27 to move, so that the locking rod 27 slides along the limiting sleeve 28 to achieve the locking of the door body 2.

[0032] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A civil air defense door for a basement, characterized in that: It comprises a door frame (1) and a door body (2) installed inside the door frame (1), and also comprises a guide rail (3) installed at the top inner side of the door frame (1) and a threshold (4) installed at the bottom end of the door frame (1); The door frame (1) is configured as a square structure, a sealing frame (101) is fixedly mounted on the inner wall of the door frame (1), and a sliding groove (11) is provided at the inner bottom end of the door frame (1); An extension frame (201) is fixedly mounted on the inner side of the door body (2), and the extension frame (201) corresponds to the inner side wall of the door frame (1); a sealing groove (202) is provided on the outer side wall of the door body (2), and the sealing groove (202) corresponds to the sealing frame (101); and a locking assembly is mounted on the inner side of the door body (2); The guide rail (3) is used to guide the sliding track of the door body (2), and the guide rail (3) comprises two groups of horizontal parts (301), inclined parts (302) and vertical parts (303) which are arranged in sequence horizontally. The middle parts of the horizontal parts (301), the inclined parts (302) and the vertical parts (303) are all penetrated by a guide groove (31). A guide rod (32) is slidably installed inside the guide groove (31). A guide wheel (33) is installed at the top end of the guide rod (32), and the guide wheel (33) is slidably installed inside the guide rail (3). A fixed seat (34) is rotatably installed at the bottom end of the guide rod (32), and the fixed seat (34) is fixedly installed on the top end of the door body (2); The threshold (4) is slidably mounted inside the slide groove (11), and the top end of the threshold (4) corresponds to the bottom end of the door body (2), and an adjustment component is installed between the threshold (4) and the door frame (1).

2. The basement air defense door according to claim 1, characterized in that: The locking assembly is used to lock the position between the door body (2) and the door frame (1), and comprises a driving seat (21), a transmission arm (22), a movable arm (23), a rotating shaft (24), a driving seat (25), a transmission rod (26) and a locking rod (27), wherein the driving seat (21) is slidably mounted on the inner side of the door body (2), the two transmission arms (22) are rotatably mounted on the two ends of the driving seat (21), and the two movable arms (23) are rotatably mounted on one end of the two transmission arms (22). The two rotating shafts (24) are rotatably mounted on one end of the two movable arms (23), and the two rotating shafts (24) are fixedly mounted on the inner side of the door body (2); the two transmission seats (25) are fixedly mounted on one end of the two movable arms (23), and the four transmission rods (26) are rotatably mounted on both ends of the two transmission seats (25); the four locking rods (27) are rotatably mounted on one end of the four transmission rods (26), and the four locking rods (27) are respectively mounted at the four inner corners of the door body (2).

3. The civil defense door for basement according to claim 2, characterized in that: The locking assembly further comprises a limiting sliding sleeve (28) and a locking sliding sleeve (29), wherein the four limiting sliding sleeves (28) are respectively fixedly mounted at the four inner corners of the door body (2), and the four limiting sliding sleeves (28) are respectively sleeved and mounted on the middle parts of four locking rods (27), and the four locking sliding sleeves (29) are respectively fixedly mounted at the inner top end of the door frame (1) and the inner side of the door sill (4), and the four limiting sliding sleeves (28) correspond to the four locking rods (27).

4. The civil defense door for basement according to claim 2, characterized in that: A screw rod groove (211) is provided through the middle of the driving seat (21), a locking screw rod (212) is installed through the inside of the screw rod groove (211), a support seat (213) is rotatably installed at the bottom end of the locking screw rod (212), and the support seat (213) is fixedly installed on the inner side of the door body (2), a driving rod (214) is installed at the top end of the locking screw rod (212), and a transmission bevel gear set (215) is installed between the driving rod (214) and the locking screw rod (212), and hand wheels are fixedly installed at both ends of the driving rod (214).

5. The basement air defense door according to claim 1, characterized in that: The adjusting assembly is used to adjust the height of the threshold (4) so ​​that it fits and seals with the bottom end of the door body (2). The adjusting assembly comprises a slot (12), a connecting slot (13), a square slot (14), a swing arm (15), a rocker arm (16), a pressing block (17) and a connecting rod (18). The slot (12) is formed on the inner side wall of the door frame (1), the connecting slot (13) is formed on the bottom of the slot (12), the square slot (14) penetrates the bottom end of the inner side wall formed on the connecting slot (13), and one end of the square slot (14) extends to the inside of the slide groove (11), the swing arm (15) is installed inside the square slot (14), and one end of the swing arm (15) is installed below the threshold (4), the rocker arm (16) is fixedly installed on one end of the swing arm (15), the pressing block (17) is installed inside the slot (12), and the connecting rod (18) is installed between the pressing block (17) and the rocker arm (16).

6. The civil defense door for basement according to claim 5, characterized in that: A support (161) is fixedly installed between the rocker arm (16) and the swing arm (15), and the support (161) is rotatably installed inside the square groove (14).

7. The civil defense door for basement according to claim 5, characterized in that: A sliding sleeve (171) is fixedly mounted on the inner side of the pressing block (17), and the sliding sleeve (171) is slidably mounted on the top end of the connecting rod (18). An arc surface (172) is provided on the outer side of the pressing block (17), and the door body (2) can slide the pressing block (17) into the slot (12) by squeezing the arc surface (172).

8. The civil air defense door for basement according to claim 5, characterized in that: A connecting seat (181) is fixedly mounted on the bottom end of the connecting rod (18), and the connecting seat (181) is rotatably mounted on the top end of the rocker arm (16).

9. The civil defense door for basement according to claim 5, characterized in that: Grooves (41) are provided at both ends of the lower surface of the door sill (4), and the top end of the swing arm (15) is slidably mounted inside the groove (41).

10. The civil air defense door for basement according to claim 1, characterized in that: The outer side wall of the door frame (1) is surrounded by a plurality of reinforcing ribs, and when the threshold (4) is located at the bottom end of the slide groove (11), its top end is flush with the basement floor.

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