Civil air defense door opening and closing device

Abstract

The invention discloses a civil air defense door opening and closing device, and relates to the technical field of civil air defense engineering, the civil air defense door opening and closing device comprises a floor, a plurality of door bodies are slidably connected to the top of the floor, a plurality of wall bodies are fixedly connected to the top of the floor, a plurality of supporting columns are rotatably connected to the top of the floor, and servo motors are arranged in the wall bodies; the output end of the servo motor is provided with an expansion sleeve coupler, a harmonic reducer and a ball screw, a fixing frame is installed on the outer surface of the ball screw, the outer wall of the ball screw is in threaded connection with a lead screw nut, a guide wheel is installed at the bottom of the door body, and a cleaning assembly is arranged at the output end of the servo motor. According to the civil air defense door opening and closing device, rapid opening and closing of a door body are achieved through a transmission chain of the servo motor, the expansion sleeve coupler, the harmonic reducer and the ball screw, dual drive from electric drive to manual drive is achieved through an interlocking structure, the functions of rapid response, synchronous stability and emergency reliability are achieved, and the opening and closing requirements of a civil air defense door are met.

Description

Technical Field

[0001] This invention relates to the field of civil defense engineering, and in particular to a civil defense door opening and closing device. Background Technology

[0002] As an important facility for protecting personnel and supplies during wartime, the reliability of the opening and closing system of air-raid shelter doors directly affects the protective effectiveness. The current mainstream technology uses electric push rods, hydraulic cylinders or manual gear rack mechanisms to realize the movement of the door. After 2020, with the application of new materials, carbon fiber guide rails and aluminum alloy frames have gradually replaced traditional steel structures. However, the transmission system still has problems such as response delay and jamming. It is clearly required that air-raid shelter doors should complete the full stroke opening and closing within 30 seconds.

[0003] The low opening and closing efficiency of air-raid shelter doors will undermine their core value in protection and daily use, triggering a series of functional, safety, and reliability problems. The opening and closing speed of the doors will decrease, and personnel and materials will not be able to be sheltered in time during wartime or emergencies, rendering the core protective function of air-raid shelter doors ineffective. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: a civil defense door opening and closing device, comprising a floor, multiple door bodies slidably connected to the top of the floor, multiple walls fixedly connected to the top of the floor, and multiple support columns rotatably connected to the top of the floor. A servo motor is installed inside each wall body. The output end of the servo motor is respectively equipped with an expansion coupling, a harmonic reducer, and a ball screw. A fixing frame is installed on the outer surface of the ball screw. A screw nut is threaded onto the outer wall of the ball screw. A hand crank is installed on the outer wall of the screw nut. A flexible hose is sleeved on one end of the ball screw. A U-shaped groove is formed on the surface of the floor. Guide wheels are installed at the bottom of each door body. A cleaning component is installed at the output end of the servo motor.

[0005] Preferably, the cleaning assembly includes a first gear, which is fixedly connected to the output end of a servo motor. A fixed rod is fixedly connected to the outer wall of the door, and a rotating rod is rotatably connected to the inner wall of the fixed rod. A second gear is fixedly connected to one end of the rotating rod, and a toothed chain is fitted onto the tooth ends of the first and second gears. A first pulley is fixedly connected to the other end of the rotating rod, and a second pulley is movably connected to the inner wall of the U-shaped groove. A belt is fitted onto the outer walls of the first and second pulleys, and multiple brushes are mounted on the outer surface of the second pulley.

[0006] Preferably, the plurality of the support columns pass through and are fixedly connected to the inner wall of the door, and the support columns are rotatably connected to the inner wall of the wall.

[0007] Preferably, both the guide wheel and the brush are slidably connected to the inner wall of the U-shaped groove, and the end of the brush is adapted to the width of the U-shaped groove.

[0008] Preferably, the plurality of ball screws are symmetrically distributed, and each end of the plurality of support columns is provided with an encoder, the encoder being electrically connected to the control terminal of the servo motor.

[0009] Preferably, the hose includes a clutch, the input end of which is fixedly connected to one end of a ball screw, the hand crank is disposed at the output end of the clutch, and a spring is disposed inside the clutch body, one end of which abuts against the clutch housing and the other end of which abuts against the drive shaft of the hand crank.

[0010] Preferably, the door body adopts a honeycomb aluminum plate sandwich structure, and the edges of the door body are wrapped with stainless steel edging.

[0011] Preferably, the lead screw nut is rigidly connected to the door body via a flange.

[0012] Preferably, the rated power of the servo motor is 3kW.

[0013] Preferably, the harmonic reducer is fixedly connected to the output end of the servo motor via an expansion coupling, and the reduction ratio is 1:120.

[0014] In summary, the present invention provides a blast door opening and closing device, which has the following beneficial effects: 1. This type of air defense door opening and closing device, through a transmission chain of servo motor-expansion coupling-harmonic reducer-ball screw, and with real-time feedback of the screw synchronization by encoder, realizes the rapid opening and closing of the door. Relying on the lightweight design of the honeycomb aluminum sandwich door body and the high strength characteristics of the stainless steel edging, it is adapted to the power output of the servo motor; through the spring interlocking structure of the clutch hose and the hand crank, it realizes a dual drive from electric to manual, achieving the functions of rapid response, synchronous stability, and emergency reliability, meeting the opening and closing requirements of air defense doors.

[0015] 2. This type of air defense door opening and closing device uses a pure mechanical transmission chain of gear-tooth chain-rotating rod-pulley-brush to drive the brush to rotate synchronously in the U-shaped groove as the door moves. Utilizing the structural design that adapts the width of the brush to the U-shaped groove, it removes dust and debris in the groove in real time, avoids guide wheel jamming, realizes self-driving cleaning of the U-shaped groove, and ensures the smooth movement trajectory of the door.

[0016] 3. This type of air defense door opening and closing device uses a servo motor to provide power for the opening and closing of the door and also drives the cleaning components through a gear-pulley transmission chain, achieving synchronous cleaning as the door moves; real-time cleaning of the U-shaped groove avoids door tilting or slow closing speed caused by guide wheel jamming, ensures the synchronous transmission accuracy of the screw, reduces the problem of excessive drive load caused by debris jamming, and enhances the overall performance of the device with fast response and long-term reliability. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the door body of the present invention; Figure 4 This is a schematic diagram of the three-dimensional structure of the door body of the present invention; Figure 5 This is a schematic diagram of the three-dimensional structure of the door body of the present invention; Figure 6 This is a schematic diagram of the three-dimensional structure of the servo motor of the present invention; Figure 7 This is a schematic diagram of the cleaning component structure of the present invention; Figure 8 This is a schematic diagram of the three-dimensional structure of the cleaning component of the present invention; Figure 9 This is a schematic diagram of the three-dimensional structure of the door body of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Floor; 2. Door; 3. Ball screw; 4. Fixing bracket; 5. Screw nut; 6. Hand crank; 7. Hose; 8. Harmonic reducer; 9. Expansion sleeve coupling; 10. Servo motor; 11. U-groove; 12. Guide wheel; 13. Support column; 14. Wall; 15. First gear; 16. Second gear; 17. Gear chain; 18. Rotating rod; 19. Fixing rod; 20. First pulley; 21. Belt; 22. Second pulley; 23. Brush. Detailed Implementation

[0019] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings.

[0020] Reference Figures 1-3 An embodiment of the present invention provides a civil defense door opening and closing device, comprising a floor 1, a plurality of door bodies 2 slidably connected to the top of the floor 1, a plurality of walls 14 fixedly connected to the top of the floor 1, a plurality of support columns 13 rotatably connected to the top of the floor 1, a servo motor 10 disposed inside the wall body 14, an expansion coupling 9, a harmonic reducer 8 and a ball screw 3 respectively disposed at the output end of the servo motor 10, a fixing frame 4 mounted on the outer surface of the ball screw 3, a screw nut 5 threadedly connected to the outer wall of the ball screw 3, a hand crank 6 disposed on the outer wall of the screw nut 5, a flexible hose 7 sleeved on one end of the ball screw 3, a U-shaped groove 11 opened on the surface of the floor 1, a guide wheel 12 mounted at the bottom of the door body 2, and a cleaning component disposed at the output end of the servo motor 10.

[0021] Specifically, wall 14 provides a stable mounting base for servo motor 10. Its output power is transmitted to harmonic reducer 8 via rigid connection of expansion coupling 9. Through a reduction ratio of 1:120, high-speed low torque is converted into low-speed high torque adapted to the movement of door 2, which then drives ball screw 3 to rotate. Fixture 4 provides multi-point support for ball screw 3, reducing its radial runout during rotation and smoothly converting the rotational motion into linear sliding of door 2 along floor 1. This power transmission link ensures that the output efficiency of 3kW servo motor 10 is maximized, keeping the movement speed of door 2 stably within a limited range to meet the requirements of rapid opening and closing. Support column 13 and bottom guide wheel 12 of door 2 form a double constraint, the former limiting the movement of door 2. Lateral offset is achieved by reducing movement resistance through the low-friction engagement of the nylon body and the groove. The two work together to minimize the amount of swaying of the door 2 throughout its entire stroke, preventing jamming caused by offset. The clutch inside the flexible hose 7 of the ball screw 3 forms a mechanical interlock with the hand crank 6. During electric drive, the clutch disengages under the action of the spring, preventing the hand crank 6 from rotating synchronously with the screw and causing safety hazards. In case of power failure, pulling down the hand crank 6 can overcome the spring force and engage the clutch, enabling emergency opening and closing through manual drive. This dual-drive design ensures the high efficiency of daily electric operation and solves the emergency problem of sudden power failure. The rigid connection and motion constraint of each component in the overall structure enable the device to operate reliably for a long time in complex environments.

[0022] Reference Figures 7-9 The cleaning assembly includes a first gear 15, which is fixedly connected to the output end of the servo motor 10. A fixed rod 19 is fixedly connected to the outer wall of the door 2. A rotating rod 18 is rotatably connected to the inner wall of the fixed rod 19. A second gear 16 is fixedly connected to one end of the rotating rod 18. A toothed chain 17 is sleeved on the tooth ends of the first gear 15 and the second gear 16. A first pulley 20 is fixedly connected to the other end of the rotating rod 18. A second pulley 22 is movably connected to the inner wall of the U-shaped groove 11. A belt 21 is sleeved on the outer walls of the first pulley 20 and the second pulley 22. Multiple brushes 23 are installed on the outer surface of the second pulley 22.

[0023] Specifically, the first gear 15 in the cleaning assembly is rigidly connected to the output end of the servo motor 10, ensuring no relative slippage between them during power output. It meshes with the second gear 16 at one end of the rotating rod 18 via a gear chain 17. The closed-loop design of the gear chain 17 adapts to the positional changes between the two gears during the movement of the door body 2, maintaining a stable meshing state and preventing power transmission interruption. The fixing rod 19 on the outer wall of the door body 2 provides reliable mounting support for the rotating rod 18. The rotational fit design between the rotating rod 18 and the inner wall of the fixing rod 19 ensures smooth rotation without jamming. The first pulley 20 at the other end of the rotating rod 18 meshes with the second pulley 2 on the inner wall of the U-shaped groove 11. 2. Driven by belt 21, the brush 23 mounted on the outer surface of the second pulley 22 can rotate synchronously with the second pulley 22, fully covering the internal space of the U-shaped groove 11. During the opening and closing of the door 2, it cleans the dust, debris and other debris accumulated in the groove in real time. The follow-up cleaning design achieved by the servo motor 10 does not require an additional drive source, which can avoid the guide wheel 12 from getting stuck or worn due to debris, ensuring the smooth movement of the door 2. At the same time, it reduces the interference of debris on the movement trajectory of the door 2, indirectly reducing the extra load on the ball screw 3 caused by the jamming of the door 2, reducing the wear of the transmission components, and thus improving the overall operational reliability of the device.

[0024] Reference Figure 4 and Figure 5 Multiple support columns 13 penetrate and are fixedly connected to the inner wall of the door 2, and the support columns 13 are rotatably connected to the inner wall of the wall 14.

[0025] Specifically, the support columns 13 are evenly distributed along the length of the door body 2 and penetrate its inner wall. They are rigidly connected to the door body 2 to form an integral structure. This allows the weight of the door body 2 and the external forces it experiences during opening and closing to be evenly distributed to each support column 13. The support columns 13 rotate within the wall 14, ensuring that the support columns 13 can rotate synchronously with the door body 2 as it slides along the floor 1. This prevents the fixed connection from hindering the normal opening and closing of the door body 2. Furthermore, the wall 14 limits the support columns 13, restricting the lateral deviation or swaying of the door body 2 during movement. This ensures that the door body 2 always runs smoothly along the preset trajectory, improving the stability and durability of the overall device.

[0026] Refer to 4 and Figure 9 The guide wheel 12 and the brush 23 are slidably connected to the inner wall of the U-shaped groove 11, and the end of the brush 23 is adapted to the width of the U-shaped groove 11.

[0027] Specifically, the sliding engagement between the guide wheel 12 and the inner wall of the U-shaped groove 11 forms the support trajectory for the movement of the door 2. Its contact with the groove wall can evenly distribute the weight of the door 2, preventing the door 2 from directly contacting the floor 1 and generating excessive frictional resistance. At the same time, it limits the vertical displacement of the door 2 and prevents it from swaying up and down during movement. The brush 23 is also slidably connected to the inner wall of the U-shaped groove 11, and its end is precisely matched with the width of the U-shaped groove 11. It can fully cover the horizontal space inside the groove without cleaning dead corners. When the door 2 opens and closes, the brush 23 moves synchronously in the groove with the relevant transmission components, cleaning up the accumulated dust, debris and other debris in real time. This prevents debris from embedding in the rolling path of the guide wheel 12, reduces the wear between the guide wheel 12 and the groove wall, and prevents the movement trajectory of the door 2 from deviating due to the interference of debris, thus improving the stability of the overall device operation.

[0028] Reference Figure 1 Multiple ball screws 3 are symmetrically distributed, and encoders are provided at the ends of multiple support columns 13. The encoders are electrically connected to the control terminal of the servo motor 10.

[0029] Specifically, the ball screws 3 are symmetrically arranged along the movement trajectory of the door body 2, which allows the two sides of the door body 2 to obtain balanced driving force, avoiding the situation where the door body 2 tilts or experiences uneven force during sliding due to concentrated force on one side. The encoder installed at the end of the support column 13 can capture the rotation state of the support column 13 as the door body 2 moves in real time, and then provide feedback on the actual movement of the two sides of the door body 2, including displacement synchronization and speed consistency. The electrical connection between the encoder and the control terminal of the servo motor 10 allows the control terminal to receive this feedback information in a timely manner and dynamically adjust the power output of the servo motor 10 according to the movement difference between the two sides of the door body 2, ensuring that the symmetrically distributed ball screws 3 always maintain synchronous operation, avoiding the jamming or deviation of the door body 2 caused by asynchronous operation of the ball screws 3, enhancing the stability of the transmission system, ensuring that the door body 2 can open and close quickly and smoothly according to the preset state, and improving the overall operational reliability and usage effect of the device.

[0030] Reference Figure 5 The hose 7 includes a clutch, the input end of which is fixedly connected to one end of the ball screw 3. The hand crank 6 is located at the output end of the clutch, and a spring is installed inside the clutch body. One end of the spring abuts against the clutch housing, and the other end abuts against the drive shaft of the hand crank 6.

[0031] Specifically, the clutch built into the hose 7 forms the core for switching between electric and manual drive. Its input end forms a stable and rigid connection with one end of the ball screw 3, ensuring no relative looseness during power transmission. It can transmit the torque of manual operation to the ball screw 3, while the hand crank 6 is set at the clutch output end as an emergency operation component, making it convenient for the operator to apply force directly. The spring inside the clutch body forms an elastic constraint through the contact of its two ends with the housing and the drive shaft of the hand crank 6, respectively. Under normal conditions, the preload of the spring can keep the clutch in a disengaged state, so that when the servo motor 10 drives the ball screw 3, the hand crank 6 will not rotate synchronously with the screw. In case of emergencies such as power failure or equipment failure, the operator only needs to apply force to the inside to quickly engage the clutch. By rotating the hand crank 6, the ball screw 3 is driven to rotate, thereby realizing the emergency opening and closing of the door 2. No additional electronic control components are required. The switching process is simple, direct and responsive, ensuring the safety and stability of daily electric drive, and solving the emergency operation needs in sudden scenarios, thus improving the overall reliability and applicability of operation.

[0032] Reference Figure 9 Door 2 adopts a honeycomb aluminum sandwich structure, and the edges of door 2 are wrapped with stainless steel edging.

[0033] Specifically, the hexagonal mesh structure of the honeycomb aluminum panel sandwich structure can evenly distribute external loads across the entire panel surface. When the door 2 is subjected to impact, it can absorb energy through the deformation of the honeycomb holes, reducing local stress concentration. The wrapped stainless steel edging forms a closed structure with the honeycomb aluminum panel. The high strength and corrosion resistance of the stainless steel material can effectively resist external impacts and erosion from humid environments, ensuring both structural strength and long-term reliability, providing dual protection for the stable operation of the civil defense door.

[0034] Reference Figure 1 The lead screw nut 5 is rigidly connected to the door body 2 via a flange.

[0035] Specifically, the rigid connection achieved through the flange ensures uniform force distribution between the two components thanks to the large contact area of ​​the flange. Combined with a fastening structure evenly distributed along the flange circumference, connection gaps are eliminated, allowing the axial thrust generated by the rotation of the ball screw 3 to be transmitted to the door 2 without loss. This avoids power lag or localized deformation of the door 2 due to loose connections. The rigid constraint ensures that the movement of the door 2 completely follows the axial displacement of the screw nut 5, ensuring that both sides of the door 2 can respond synchronously when the two ball screws 3 are symmetrically distributed. This reduces tilting of the door 2 caused by displacement differences on both sides. Simultaneously, the guiding effect of the support column 13 makes the sliding trajectory of the door 2 within the U-groove 11 more stable. Furthermore, the gapless rigid connection reduces vibration transmission during the transmission process, preventing long-term vibration from causing increased wear on the threaded connection between the screw nut 5 and the ball screw 3, extending the service life of the transmission components. This allows the power output of the servo motor 10 to be efficiently converted into the opening and closing of the door 2, ensuring the overall accuracy and reliability of the device's operation.

[0036] Reference Figure 6 The rated power of the servo motor 10 is 3kW.

[0037] Specifically, the 3kW rated power of the servo motor 10 is precisely matched with the lightweight honeycomb aluminum plate structure of the door body 2 and the reduction ratio of the harmonic reducer 8. This provides sufficient driving force for the double ball screw 3, ensuring that the door body 2 can open and close quickly under the transmission of the ball screw 3 and the screw nut 5, without wasting energy or causing additional load on the transmission components due to excessive power. It also adapts to the constraint and guidance of the support column 13 and the guide wheel 12. When the door body 2 slides along the U-shaped groove 11, the 3kW power is rigidly transmitted and reduced through the expansion coupling 9. The torque amplification of the device can smoothly overcome the frictional resistance and possible jamming when the door 2 moves. With the real-time feedback of the encoder, it can provide sufficient power when the lead screw needs to be dynamically adjusted for synchronization, avoiding tilting of the door 2 or interruption of opening and closing due to insufficient power. At the same time, the rated power of 3kW takes into account the high efficiency of electric drive and the feasibility of manual emergency operation. It will not cause the hand crank 6 to bear excessive resistance in emergency situations due to excessive power. It achieves a balance between power output and system load and operation requirements, ensuring that the device can operate stably in both daily and emergency scenarios.

[0038] Reference Figure 6 The harmonic reducer 8 is fixedly connected to the output end of the servo motor 10 via the expansion coupling 9, and the reduction ratio is 1:120.

[0039] Specifically, the radial expansion characteristic of the expansion coupling 9 is used to eliminate connection gaps, allowing the power of the servo motor 10 to be transmitted to the harmonic reducer 8 without loss. This avoids the loosening or vibration that may occur with traditional key connections, ensuring the rigidity and stability of power transmission. The 1:120 reduction ratio design converts the high-speed output of the servo motor 10 into low-speed, high-torque output suitable for the movement of the door 2. This satisfies the driving force required by the door 2 under the transmission of the ball screw 3 and screw nut 5, ensuring that the door 2 can still move smoothly even when the guide wheel 12 rubs against the U-shaped groove 11. Furthermore, by reducing the output speed, the rotational wear of the ball screw 3 is reduced, extending the life of the transmission components. This allows the power output of the servo motor 10 to match the load of the door 2. With the encoder's synchronous control of the screw, a stable torque output can be maintained during the opening and closing of the door 2, preventing the door 2 from tilting or jamming due to power fluctuations. At the same time, it reduces the energy loss caused by frequent motor starts and stops, indirectly improving the operating efficiency and reliability of the device.

[0040] Working principle: The servo motor 10 serves as the core power source, its 3kW rated power is rigidly transmitted to the harmonic reducer 8 via the expansion coupling 9. A 1:120 reduction ratio converts the high-speed output into low-speed, high-torque output suitable for the movement of the door 2, driving the symmetrically distributed ball screws 3 to rotate. The ball screws 3 are stably supported by the fixing frame 4, and the screw nut 5 on its outer wall forms a gapless rigid connection with the door 2 via a flange, precisely converting the rotational motion into the linear sliding of the door 2. The honeycomb aluminum plate sandwich structure and stainless steel edging of the door 2 ensure strength while achieving lightweight design and reducing the drive load. The inner wall of the door 2 is penetrated by… The support column 13 is rotatably connected to the wall 14 at both ends, forming a double constraint with the sliding of the guide wheel 12 at the bottom of the door 2 in the U-shaped groove 11. In conjunction with the electrical connection between the encoder at the end of the support column 13 and the servo motor 10, the movement status of the door 2 is fed back in real time and the screw is adjusted to operate synchronously, so as to prevent the door 2 from tilting or jamming. The clutch built into the flexible hose 7 at one end of the ball screw 3 forms an electric and manual interlock with the hand crank 6 through the spring. Under normal conditions, it remains separated to avoid power interference. In case of sudden power failure, it can be manually engaged to drive, ultimately realizing the core functions of rapid opening and closing of the door 2 and emergency reliability. Moreover, the cooperation of each component reduces transmission loss and improves the long-term operational stability of the device.

[0041] The cleaning component is driven by the first gear 15 at the output end of the servo motor 10, which meshes with the second gear 16 at one end of the rotating rod 18 via the toothed chain 17. The rotating rod 18 is stably supported by the fixed rod 19 on the outer wall of the door body 2 and can move synchronously with the door body 2. The first pulley 20 at the other end drives the second pulley 22 on the inner wall of the U-shaped groove 11 to rotate via the belt 21. Multiple brushes 23 on the outer surface of the second pulley 22 are adapted to the width of the U-shaped groove 11. When rotating, they can fully cover the space inside the groove, cleaning dust, debris and other debris in real time during the opening and closing of the door body 2. The door body 2 can be cleaned as it moves without the need for an additional drive source. This effectively avoids debris from getting stuck in the rolling path of the guide wheel 12, removes dust and debris from the groove in real time, prevents the guide wheel 12 from getting stuck, and extends the maintenance cycle and service life of the overall device.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A blast door opening and closing device, comprising a floor (1), characterized in that: The top of the floor (1) is slidably connected to multiple doors (2), the top of the floor (1) is fixedly connected to multiple walls (14), the top of the floor (1) is rotatably connected to multiple support columns (13), the interior of the wall (14) is equipped with a servo motor (10), the output end of the servo motor (10) is respectively equipped with an expansion coupling (9), a harmonic reducer (8) and a ball screw (3), the outer surface of the ball screw (3) is equipped with a fixing frame (4), the outer wall of the ball screw (3) is threaded with a screw nut (5), the outer wall of the screw nut (5) is equipped with a hand crank (6), one end of the ball screw (3) is fitted with a flexible hose (7), the surface of the floor (1) is provided with a U-shaped groove (11), the bottom of the door (2) is equipped with a guide wheel (12), and the output end of the servo motor (10) is equipped with a cleaning component.

2. The air defense door opening and closing device according to claim 1, characterized in that: The cleaning assembly includes a first gear (15), which is fixedly connected to the output end of a servo motor (10). A fixed rod (19) is fixedly connected to the outer wall of the door (2). A rotating rod (18) is rotatably connected to the inner wall of the fixed rod (19). A second gear (16) is fixedly connected to one end of the rotating rod (18). A toothed chain (17) is sleeved on the tooth ends of the first gear (15) and the second gear (16). A first pulley (20) is fixedly connected to the other end of the rotating rod (18). A second pulley (22) is movably connected to the inner wall of the U-shaped groove (11). A belt (21) is sleeved on the outer wall of the first pulley (20) and the second pulley (22). A plurality of brushes (23) are installed on the outer surface of the second pulley (22).

3. The air defense door opening and closing device according to claim 1, characterized in that: Multiple support columns (13) are inserted through and fixedly connected to the inner wall of the door (2), and the support columns (13) are rotatably connected to the inner wall of the wall (14).

4. The air-raid shelter door opening and closing device according to claim 1, characterized in that: The guide wheel (12) and the brush (23) are slidably connected to the inner wall of the U-shaped groove (11), and the end of the brush (23) is adapted to the width of the U-shaped groove (11).

5. The air-raid shelter door opening and closing device according to claim 1, characterized in that: Multiple ball screws (3) are symmetrically distributed, and encoders are provided at the ends of multiple support columns (13). The encoders are electrically connected to the control end of the servo motor (10).

6. The air-raid shelter door opening and closing device according to claim 1, characterized in that: The hose (7) includes a clutch, the input end of which is fixedly connected to one end of the ball screw (3), the hand crank (6) is located at the output end of the clutch, and a spring is provided inside the clutch body, one end of which abuts against the clutch housing and the other end abuts against the drive shaft of the hand crank (6).

7. The air-raid shelter door opening and closing device according to claim 1, characterized in that: The door (2) adopts a honeycomb aluminum plate sandwich structure, and the edges of the door (2) are wrapped with stainless steel edging.

8. The air-raid shelter door opening and closing device according to claim 1, characterized in that: The lead screw nut (5) is rigidly connected to the door body (2) through a flange.

9. The air-raid shelter door opening and closing device according to claim 1, characterized in that: The servo motor (10) has a rated power of 3kW.

10. A blast door opening and closing device according to claim 1, characterized in that: The harmonic reducer (8) is fixedly connected to the output end of the servo motor (10) via an expansion coupling (9), and the reduction ratio is 1:120.

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