Fire-fighting special lifting device for overpass

Abstract

This invention relates to the field of fire-fighting equipment technology, specifically to a special lifting device for fire-fighting overpasses, comprising: an overpass main body, a base installed at the bottom of the overpass main body, and an openable fire escape window on the outer side of the overpass main body; the invention, by setting up a translation mechanism, when a fire occurs at both ends of the overpass main body, the drive motor can drive the U-shaped plate below to extend through the lead screw, forming a temporary standing platform outside the fire escape window of the overpass main body. Trapped personnel in the overpass main body can be transferred to the standing platform first, which not only prevents them from continuing to stay inside the overpass main body and causing injury, but also reduces the tension of the people on site after moving to the standing platform. Trapped personnel can evacuate in an orderly manner through the extended fire escape ladder, reducing the harm caused by the fire to people.

Description

Technical Field

[0001] This invention relates to the field of fire protection equipment technology, specifically to a special lifting device for fire protection of overpasses. Background Technology

[0002] Overpasses, a type of building that spans roads or alleys, are commonly found in traditional neighborhoods, commercial complexes, and some public buildings, typically providing a public passageway for pedestrians or vehicles. Because overpasses often connect different functional areas with high pedestrian traffic, their fire safety design is particularly important.

[0003] Currently, fire evacuation in overpass buildings primarily relies on the internal staircases at both ends. However, when a fire breaks out at one or both ends of the overpass simultaneously, traditional evacuation routes may be cut off by flames, smoke, or structural collapse, preventing trapped individuals from escaping via conventional staircases. This is especially true in the central area of ​​the overpass, where people are far from the exits at both ends, easily creating blind spots when the fire spreads rapidly. To address this issue, some overpass designs incorporate external steel staircases or folding escape ladders.

[0004] Traditional fire escape devices are fixed directly to the outside of the overpass. When a fire occurs, the scene is too chaotic, and trapped people cannot climb down the escape ladder in an orderly manner. Furthermore, the ladder exit is prone to congestion and trampling risks, while people still inside the overpass are easily injured. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a special lifting device for fire protection of overpass buildings, which can effectively solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a special lifting device for fire protection of overpasses, comprising: The main body of the overpass building has a base installed at its bottom and an openable fire-fighting window on its outer side. The translation mechanism includes a drive motor installed at the bottom of the base. The output shaft of the drive motor is fixedly connected to a lead screw via a coupling. An internal thread block is threaded to the outer side of the lead screw, and a U-shaped plate is fixedly connected to the bottom of the internal thread block. The unfolding mechanism includes an unfolding mechanism installed on the outside of the U-shaped plate. The output shaft of the unfolding mechanism is fixedly connected to a drive shaft extending into the U-shaped plate via a coupling. A main fire ladder is fixedly connected to the outside of the drive shaft. A storage slot is provided on the back of the main fire ladder. A rotatable auxiliary fire ladder is provided inside the storage slot.

[0007] Preferably, the base is fixedly connected to four symmetrically distributed fixed feet, and the fixed feet are provided with through mounting holes on the outside. The mounting holes are provided with mounting bolts that extend into the main body of the overpass.

[0008] Preferably, the top of the U-shaped plate is fixedly connected to four symmetrically distributed sliding sleeves in pairs, and the inner walls of two adjacent sliding sleeves are slidably connected to the same smooth sliding rod. Both ends of the two sliding rods are fixedly connected to a fixing block, and the fixing block is fixedly connected to the bottom of the base.

[0009] Preferably, the end of the lead screw away from the drive motor is rotatably connected to a support block via a bearing, and the support block is fixedly connected to the bottom of the base.

[0010] Preferably, the inner wall of the storage slot is rotatably connected to a rotating shaft via a bearing, the auxiliary fire ladder is fixedly connected to the outside of the rotating shaft, one end of the rotating shaft passes through the storage slot and extends to the outside of the main fire ladder.

[0011] Preferably, a rotating block is fixedly connected to one end of the rotating shaft located outside the main fire ladder. A through screw hole is opened on the outer side of the rotating block, and a threaded rod is threadedly connected to the inner wall of the screw hole. A first limiting hole is opened on the outer side of the main fire ladder, and a second limiting hole is opened on the outer side of the auxiliary fire ladder.

[0012] Preferably, an L-shaped plate is fixedly connected to the outer side of the base, and the bottom of the inner wall of the L-shaped plate is on the same plane as the bottom of the main fire ladder in the stored state, which is used to support the side of the main fire ladder away from the drive shaft in the stored state.

[0013] Preferably, a rack is fixedly connected to the inner wall of the L-shaped plate, and a gear is fixedly connected to the end of the threaded rod away from the main fire ladder. When the gear moves to the bottom of the rack, the outer side of the gear meshes with the bottom of the rack.

[0014] The technical solution provided by this invention has the following advantages compared with the known prior art: 1. This invention, by setting up a translation mechanism, allows the drive motor to extend the U-shaped plate below the main body of the overpass building when a fire occurs at either end. This forms a temporary standing platform outside the fire escape window of the main body of the overpass building. Trapped personnel inside the main body of the overpass building can be transferred to the standing platform first. This not only prevents them from remaining inside the main body of the overpass building and causing further injury, but also reduces the tension of on-site personnel after they move to the standing platform. Trapped personnel can then evacuate in an orderly manner through the extended fire escape ladder, reducing the harm caused by the fire.

[0015] 2. By setting up an unfolding mechanism, after the translation mechanism extends the U-shaped plate, the main fire ladder loses the restriction from the L-shaped plate, and the rack can drive the threaded rod to rotate through the gear, causing it to move out of the first limiting hole. At this time, the unfolding mechanism can drive the main fire ladder and the auxiliary fire ladder to flip and unfold, and then rotate the threaded rod to make it enter the second limiting hole, limiting the connection between the main fire ladder and the auxiliary fire ladder. At this time, the main fire ladder and the auxiliary fire ladder form an escape channel, which facilitates the orderly escape of trapped personnel.

[0016] 3. By setting up a translation mechanism and an unfolding mechanism, the present invention can store the entire device at the bottom of the overpass main body when no fire occurs. Under the action of the overpass main body, the device is protected and effectively avoids malfunctions caused by external wind and sun exposure, thereby improving the service life of the device. Moreover, by storing the entire device, the space occupied is reduced, which has good practicality. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the fire-fighting lifting device for pedestrian overpasses according to the present invention; Figure 2 This is a schematic diagram of the base structure of the present invention; Figure 3 This is a schematic diagram of the lead screw structure of the present invention; Figure 4 This is a schematic diagram of the top structure of the U-shaped plate of the present invention; Figure 5 This is a schematic diagram of the auxiliary fire escape ladder in its stowed state according to the present invention; Figure 6 This is a schematic diagram of the main fire escape staircase of the present invention; Figure 7 This is a schematic diagram of the auxiliary fire escape staircase of the present invention; Figure 8 This is a schematic diagram of the escape state according to the present invention.

[0019] The labels in the diagram represent: 1. Main structure of the overpass; 2. Fire escape window; 3. Base; 31. Fixing feet; 4. Translation mechanism; 41. U-shaped plate; 42. Sliding sleeve; 43. Sliding rod; 44. Support block; 45. Lead screw; 46. Fixing block; 47. Drive motor; 48. Internal thread block; 5. Deployment mechanism; 51. Deployment mechanism; 52. Drive shaft; 53. Main fire ladder; 531. First limiting hole; 532. Storage slot; 54. Rack; 55. L-shaped plate; 56. Auxiliary fire ladder; 561. Second limiting hole; 57. Rotating shaft; 58. Rotating block; 59. Gear; 591. Threaded rod. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] The present invention will be further described below with reference to embodiments.

[0022] Example 1: Reference Figure 1-4 and Figure 5 The first embodiment of the present invention discloses a special lifting device for fire protection of overpasses, comprising: The main body of the overpass 1 has a base 3 installed at its bottom. Openable fire escape windows 2 are installed on the outer side of the main body 1. In the event of a fire at either end of the main body 1, these fire escape windows 2 will serve as a crucial exit for trapped personnel to transfer to a temporary standing platform. By precisely extending a U-shaped panel 41 to the outside of the fire escape window 2, trapped personnel can open the fire escape window 2 and safely climb over onto the U-shaped panel 41, thus avoiding injury from fire or smoke caused by prolonged entrapment inside the main body 1. Simultaneously, the orderly transfer process effectively reduces the anxiety of personnel on site. Specifically, four fixed feet 31 are fixedly connected to the outer side of the base 3, which are symmetrically distributed in pairs. The fixed feet 31 have through mounting holes on their outer sides. The mounting holes are equipped with mounting bolts that extend into the main body 1 of the overpass. Through the cooperation of the fixed feet 31 and the mounting bolts, the base 3 can be firmly installed at the bottom of the main body 1 of the overpass, ensuring the overall stability of the device during long-term use or emergency start-up, preventing the normal operation of the translation mechanism 4 or the unfolding mechanism 5 from being affected by loosening or shaking, thereby improving the overall reliability and safety of the device.

[0023] The translation mechanism 4 includes a drive motor 47 mounted on the bottom of the base 3. The output shaft of the drive motor 47 is fixedly connected to a lead screw 45 via a coupling. An internal threaded block 48 is threaded onto the outer side of the lead screw 45, and a U-shaped plate 41 is fixedly connected to the bottom of the internal threaded block 48. When a fire occurs, the drive motor 47 starts, and its output shaft drives the lead screw 45 to rotate. The internal threaded block 48 moves axially along the lead screw 45, thereby driving the U-shaped plate 41 to extend smoothly from the bottom of the base 3. After the U-shaped plate 41 extends, it is positioned exactly outside the fire window 2, forming a temporary standing platform. Trapped personnel can first transfer to this platform, which not only temporarily avoids the direct threat from the fire center, but also creates a safe and stable transition space for subsequent orderly evacuation.

[0024] Specifically, four symmetrically arranged sliding sleeves 42 are fixedly connected to the top of the U-shaped plate 41. A smooth sliding rod 43 is slidably connected to the inner wall of adjacent sliding sleeves 42. Fixing blocks 46 are fixedly connected to both ends of each sliding rod 43, and the fixing blocks 46 are fixedly connected to the bottom of the base 3. The cooperation between the sliding rods 43 and the sliding sleeves 42 provides precise guidance for the translation of the U-shaped plate 41, ensuring that the U-shaped plate 41 maintains a straight line during extension and retraction, avoiding skewness or jamming. Simultaneously, this structure can effectively bear the dynamic load generated when trapped personnel are transferred onto the U-shaped plate 41, further improving the structural stability and safety of the temporary standing platform.

[0025] Specifically, the end of the lead screw 45 furthest from the drive motor 47 is rotatably connected to a support block 44 via a bearing. The support block 44 is fixedly connected to the bottom of the base 3, providing stable rotational support to the end of the lead screw 45. This prevents the long-stroke lead screw 45 from bending, deforming, or jumping under force, thus ensuring the accuracy and reliability of the translation mechanism 4 during long-term operation. After use, the U-shaped plate 41 can retract smoothly and accurately, reducing the possibility of failure to properly store the device due to mechanical failure.

[0026] Example 2: Reference Figure 1-8 This is the second embodiment of the present invention, which differs from the first embodiment in that: The deployment mechanism 5 includes a deployment mechanism 51 installed on the outside of the U-shaped plate 41. The output shaft of the deployment mechanism 51 is fixedly connected to a drive shaft 52 extending into the U-shaped plate 41 via a coupling. A main fire ladder 53 is fixedly connected to the outside of the drive shaft 52. A storage slot 532 is provided on the back of the main fire ladder 53. A rotatable auxiliary fire ladder 56 is installed inside the storage slot 532. After the translation mechanism 4 fully extends the U-shaped plate 41 and there are trapped personnel on the standing platform, the deployment mechanism 51 is activated. Its output shaft drives the main fire ladder 53 to rotate downwards and unfold from the stored state through the drive shaft 52. The auxiliary fire ladder 56 automatically flips out from the storage slot 532 under the action of gravity or mechanical linkage. After the main fire ladder 53 and the auxiliary fire ladder 56 unfold in sequence, they form a complete escape route, allowing trapped personnel on the standing platform to safely and orderly evacuate to the ground along this route, greatly improving the escape efficiency in emergencies such as fires.

[0027] Specifically, a rotating shaft 57 is rotatably connected to the inner wall of the storage slot 532 via bearings. An auxiliary fire ladder 56 is fixedly connected to the outside of the rotating shaft 57. One end of the rotating shaft 57 passes through the storage slot 532 and extends to the outside of the main fire ladder 53. The auxiliary fire ladder 56 is rotatably connected to the main fire ladder 53 via the rotating shaft 57, allowing it to be completely stored in the storage slot 532 on the back of the main fire ladder 53 when no fire occurs, reducing the overall space occupied by the structure. When the escape route needs to be deployed, the rotating shaft 57 can rotate smoothly, ensuring that the auxiliary fire ladder 56 can quickly and stably flip from its stored position to a working position coplanar with the main fire ladder 53, forming a continuous ladder section for trapped personnel to descend sequentially.

[0028] Specifically, a rotating block 58 is fixedly connected to one end of the rotating shaft 57 located outside the main fire ladder 53. A through screw hole is opened on the outer side of the rotating block 58, and a threaded rod 591 is threadedly connected to the inner wall of the screw hole. A first limiting hole 531 is opened on the outer side of the main fire ladder 53, and a second limiting hole 561 is opened on the outer side of the auxiliary fire ladder 56. When the device is in the storage state, the threaded rod 591 is inserted into the first limiting hole 531 to restrict the rotation of the rotating shaft 57, thereby firmly locking the auxiliary fire ladder 56 in the storage slot 532. When the translation mechanism 4 drives the U-shaped plate 41 to extend outward, the threaded rod 591 is automatically rotated out of the first limiting hole 531 through the linkage mechanism, releasing the lock on the auxiliary fire ladder 56. After the main fire ladder 53 and the auxiliary fire ladder 56 are fully deployed and form an escape passage, the threaded rod 591 can be manually or automatically rotated to enter the second limiting hole 561 on the auxiliary fire ladder 56, which can reliably limit the deployed state and prevent the main fire ladder 53 and the auxiliary fire ladder 56 from rotating relative to each other during use, thus ensuring the structural rigidity of the escape passage.

[0029] Specifically, an L-shaped plate 55 is fixedly connected to the outer side of the base 3. The bottom of the inner wall of the L-shaped plate 55 is on the same plane as the bottom of the main fire ladder 53 in its retracted state, serving as support for the side of the main fire ladder 53 away from the drive shaft 52 in its retracted state. When the entire device is retracted into the bottom of the overpass building 1, the L-shaped plate 55 supports the free end of the main fire ladder 53 from below, keeping it in a horizontal retracted state and preventing deformation due to gravity or long-term storage. At the same time, the coplanar design of the bottom of the inner wall of the L-shaped plate 55 and the bottom of the main fire ladder 53 ensures the accurate position of the main fire ladder 53 during retraction, and also allows the main fire ladder 53 to smoothly detach from the support of the L-shaped plate 55 without impact or jamming during the initial stage of the translation mechanism 4 extending from the U-shaped plate 41.

[0030] Specifically, a rack 54 is fixedly connected to the inner wall of the L-shaped plate 55, and a gear 59 is fixedly connected to the end of the threaded rod 591 away from the main fire ladder 53. When the gear 59 moves below the rack 54, the outer side of the gear 59 meshes with the bottom of the rack 54. During the process of the translation mechanism 4 driving the U-shaped plate 41 to extend outward, the gear 59 moves together with the U-shaped plate 41. When it moves below the rack 54, the gear 59 meshes with the rack 54. At this time, the U-shaped plate 41 continues to extend outward, and the rack 54 drives the gear 59 to rotate, thereby driving the threaded rod 591 to rotate in the threaded hole, so that the threaded rod 591 automatically exits from the first limiting hole 531, completing the release of the lock on the rotating shaft 57. Similarly, when the U-shaped plate 41 retracts and resets, the gear 59 meshes with the rack 54 again and rotates in the opposite direction, driving the threaded rod 591 to screw back into the first limiting hole 531, realizing the automatic locking of the auxiliary fire ladder 56 in the retracted state. This interconnected design requires no additional power source or manual operation, simplifying the unfolding and storage process and further improving the automation and reliability of the device.

[0031] The remaining structure is the same as that in Example 1.

[0032] The workflow of this invention is as follows: When a fire or other disaster occurs at either end of the main body 1 of the overpass, the drive motor 47 is started. The drive motor 47 drives the lead screw 45 to rotate through the output shaft. The rotation of the lead screw 45 drives the internal thread block 48 to move. The movement of the internal thread block 48 drives the U-shaped plate 41 to move slowly outward until the U-shaped plate 41 extends to its maximum length. At this time, the U-shaped plate 41 forms a temporary standing platform outside the fire window 2. During the movement of the U-shaped plate 41, the rack 54 drives the gear 59 to rotate, thereby driving the threaded rod 591 to rotate in the threaded hole. When the gear 59 and the rack 54 separate, the threaded rod 591 moves out of the first limiting hole 531, thus canceling the limitation on the rotation of the rotating shaft 57. People trapped at the main body 1 of the overpass can open the fire window 2 and climb over the edge of the fire window 2 to reach the standing platform, which provides a temporary standing position for the trapped people. The deployment mechanism 51 is activated, which drives the transmission shaft 52 to rotate via the output shaft. The rotation of the transmission shaft 52 causes the main fire ladder 53 to rotate until it reaches a suitable angle (90°-120°) and then stops. While the main fire ladder 53 is rotating, the auxiliary fire ladder 56 is flipped out of the storage slot 532 by the action of the rotating shaft 57. By rotating the threaded rod 591, it is pushed into the second limiting hole 561. At this time, the main fire ladder 53 and the auxiliary fire ladder 56 are in the same straight line, and the trapped personnel on the standing platform can evacuate to the ground through the main fire ladder 53 and the auxiliary fire ladder 56. After the device is used, the auxiliary fire ladder 56 is flipped in the opposite direction so that it is stored in the storage slot 532. Then, the drive unfolding mechanism 51 is driven to rotate in the opposite direction until the main fire ladder 53 and the U-shaped plate 41 are parallel. At this time, the drive motor 47 rotates in the opposite direction to retract the extended U-shaped plate 41 until the U-shaped plate 41 is fully reset. During the retraction of the U-shaped plate 41, the rack 54 drives the gear 59 to rotate, thereby driving the threaded rod 591 to rotate and enter the first limiting hole 531 to limit the position of the auxiliary fire ladder 56 in the storage slot 532. The L-shaped plate 55 is supported from the bottom of the main fire ladder 53.

[0033] The motors used in this invention are all existing known electrical devices, and all can be purchased and used directly on the market. Their structure, circuit and control principle are all existing known technologies. Therefore, the structure, circuit and control principle of the motors will not be described in detail here.

[0034] All standard parts used in this application can be purchased from the market. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art and are also general components, which are common knowledge in this field.

[0035] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A special lifting device for fire fighting in overpass buildings, characterized in that, include: The main body of the overpass building (1) is equipped with a base (3) at the bottom of the main body of the overpass building (1), and an openable fire window (2) is provided on the outside of the main body of the overpass building (1). The translation mechanism (4) includes a drive motor (47) installed at the bottom of the base (3). The output shaft of the drive motor (47) is fixedly connected to a lead screw (45) via a coupling. An internal thread block (48) is threaded to the outside of the lead screw (45). A U-shaped plate (41) is fixedly connected to the bottom of the internal thread block (48). The unfolding mechanism (5) includes an unfolding mechanism (51) installed on the outside of the U-shaped plate (41). The output shaft of the unfolding mechanism (51) is fixedly connected to a drive shaft (52) extending into the U-shaped plate (41) via a coupling. The outside of the drive shaft (52) is fixedly connected to a main fire ladder (53). A storage slot (532) is provided on the back of the main fire ladder (53). A reversible auxiliary fire ladder (56) is provided inside the storage slot (532).

2. The special lifting device for fire protection of overpasses according to claim 1, characterized in that, The base (3) is fixedly connected to four symmetrically distributed fixed feet (31) on the outside. The fixed feet (31) have through mounting holes on the outside. The mounting holes are provided with mounting bolts that extend into the main body (1) of the overpass.

3. The special lifting device for fire protection of overpasses according to claim 1, characterized in that, The top of the U-shaped plate (41) is fixedly connected to four symmetrically distributed sliding sleeves (42). The inner walls of two adjacent sliding sleeves (42) are slidably connected to the same smooth sliding rod (43). Both ends of the two sliding rods (43) are fixedly connected to a fixing block (46), which is fixedly connected to the bottom of the base (3).

4. The fire-fighting lifting device for overpasses according to claim 1, characterized in that, The end of the lead screw (45) away from the drive motor (47) is rotatably connected to a support block (44) via a bearing, and the support block (44) is fixedly connected to the bottom of the base (3).

5. A special lifting device for fire protection of overpasses according to claim 1, characterized in that, The inner wall of the storage slot (532) is rotatably connected to a rotating shaft (57) via a bearing. The auxiliary fire ladder (56) is fixedly connected to the outside of the rotating shaft (57). One end of the rotating shaft (57) passes through the storage slot (532) and extends to the outside of the main fire ladder (53).

6. A special lifting device for fire protection of overpasses according to claim 5, characterized in that, The rotating shaft (57) is fixedly connected to a rotating block (58) at one end outside the main fire ladder (53). A through screw hole is opened on the outer side of the rotating block (58), and a threaded rod (591) is threadedly connected to the inner wall of the screw hole. A first limiting hole (531) is opened on the outer side of the main fire ladder (53), and a second limiting hole (561) is opened on the outer side of the auxiliary fire ladder (56).

7. A special lifting device for fire protection of overpasses according to claim 1, characterized in that, An L-shaped plate (55) is fixedly connected to the outside of the base (3). The bottom of the inner wall of the L-shaped plate (55) is on the same plane as the bottom of the main fire ladder (53) in the storage state, and is used for support of the main fire ladder (53) in the storage state on the side away from the drive shaft (52).

8. A special lifting device for fire protection of overpasses according to claim 7, characterized in that, A rack (54) is fixedly connected to the inner wall of the L-shaped plate (55), and a gear (59) is fixedly connected to the end of the threaded rod (591) away from the main fire ladder (53). When the gear (59) moves to the bottom of the rack (54), the outer side of the gear (59) meshes with the bottom of the rack (54).

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