A fall prevention device for flexible doors

Abstract

This application relates to an anti-fall device for flexible doors, belonging to the field of flexible door technology. It includes a base beam and a door frame. A pulley system is installed at the non-end positions of the base beam, and a load-bearing steel wire rope is threaded through the pulley system to drive the base beam to rise. An anti-fall component is installed on the side of the base beam near the pulley system to prevent the base beam from falling, and the anti-fall component is connected to the pulley system. A pressure detection component is provided on the side of the base beam near the pulley system to detect the pressure on the pulley system. This application significantly reduces the structural strength requirements of the base beam while maintaining its original span capacity. Furthermore, the anti-fall component and pressure detection component further protect the base beam, reducing the risk of it falling.

Description

Technical Field

[0001] This application relates to the field of flexible door technology, and in particular to an anti-fall device for flexible doors. Background Technology

[0002] Flexible doors, a special type of door suitable for extra-large doorways (typically ranging from 200 to 2000 square meters), are made of soft materials such as PVC and rubber. They offer significant advantages including flexible bending, efficient opening, and space saving. These doors are primarily driven by rollers or steel cables and are widely used in industrial plants, shipyard hangars, and large public facilities. Due to the enormous size of these doorways and the often insufficient structural space on both sides for door installation, flexible doors are the only feasible solution for opening and closing these massive doorways. However, precisely because of the large size of the doorways, they face severe challenges in practical applications regarding structural wind resistance, overall strength, and operational safety, especially placing higher demands on structural reliability.

[0003] In existing technologies, the main safety risk of flexible doors lies in the accidental fall of the door itself. This problem stems primarily from three aspects: first, insufficient structural strength leading to breakage under strong winds or other external forces; second, breakage of the steel cable during operation, causing the flexible door to fall; and third, malfunction of the motor drive system. Structural strength issues can be controlled through rigorous mechanical calculations and the inclusion of sufficient safety margins. The risk of motor malfunction can be effectively mitigated by employing a worm gear transmission mechanism and utilizing its reverse-stroke self-locking characteristic. However, the risk of steel cable breakage is highly variable due to various factors such as material fatigue, installation errors, and external impacts, making it difficult to fully predict and control. Therefore, it remains a key focus of safety prevention and control.

[0004] Reference Figure 3 In existing technologies, the installation method of the bottom beam and steel wire rope relies on the breakage of the steel wire rope as a trigger condition for most safety devices, requiring the triggering mechanism to be directly connected to the steel wire rope. This constraint limits the placement of the steel wire rope to the vicinity of the tracks on both sides of the door. The conventional driving method for flexible doors involves a motor winding a steel wire rope, which pulls the bottom beam up and down, thus opening and closing the curtain. When open, the middle section of the curtain stacks on top of the bottom beam, resulting in a simply supported beam structure with its ends as supports and the middle section bearing the load of the stacked curtains. As the doorway width increases, the bending moment on the bottom beam increases dramatically. To meet stiffness and strength requirements, the cross-sectional dimensions and material usage of the bottom beam must be significantly increased, leading to a bulky and expensive structure, and requiring a larger stacking space above the doorway. This design not only results in a serious waste of material properties but also significantly increases manufacturing costs due to excessive redundancy in performance.

[0005] Therefore, there is an urgent need for a method that can effectively balance the wind pressure resistance requirements and structural strength requirements of flexible doors, thereby improving their safety. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide an anti-fall device for flexible doors, which solves the technical problem that flexible doors are prone to falling.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A fall prevention device for a flexible door includes a base beam and a door frame. A pulley block is installed at a non-end position of the base beam, and a load-bearing steel wire rope is threaded through the pulley block for driving the base beam to rise. An anti-fall component is installed on the side of the base beam near the pulley block to prevent the base beam from falling, and the anti-fall component is connected to the pulley block. A pressure detection component is provided on the side of the base beam near the pulley block for detecting the pressure of the pulley block.

[0009] Furthermore, the pulley block includes several bases and load-bearing movable pulleys. The bases are rotatably mounted on the bottom beam, and the load-bearing movable pulleys are rotatably mounted on the bases. The load-bearing wire rope passes through the load-bearing movable pulleys.

[0010] Furthermore, the anti-fall component includes a hook, which is rotatably mounted on the base beam, and a compression spring is provided between the hook and the base beam. The compression spring abuts against the hook and the base beam. A transmission steel wire rope is connected between the hook body and the base. A hanging shaft is provided on the door frame, and several hanging shafts are spaced apart on the door frame.

[0011] Furthermore, the pressure detection assembly includes a tension spring located on the side of the base near the hook, with one end of the tension spring connected to the base and the other end connected to the bottom beam.

[0012] Furthermore, a support rod is provided on the side of the base opposite to the tension spring, a sliding plate is provided on the support rod, the sliding plate abuts against the base, and a pressure spring is provided between the sliding plate and the bottom beam, the pressure spring abutting between the sliding plate and the bottom beam.

[0013] Furthermore, a limiting rod is provided on one side of the base relative to the hook, with one end of the limiting rod mounted on the bottom beam and the other end extending towards the side of the base.

[0014] Furthermore, a hanging groove is formed on the hook, and a guide slope is formed on the hook, with the guide slope facing the inner side close to the hanging groove.

[0015] In summary, this application includes at least one of the following beneficial technical effects of a fall prevention device for flexible doors:

[0016] 1. During use, the pulley block is installed in the middle of the bottom beam. The bottom beam is lifted by the load steel wire rope and the pulley block. This solves the limitation that the steel wire rope fixing points on the existing flexible door bottom beam can only be at both ends. This greatly reduces the structural strength requirement of the bottom beam while maintaining the original span capacity. In addition, the bottom beam is protected by anti-fall components and pressure detection components to reduce the risk of the bottom beam falling.

[0017] 2. By using the compression spring on one side of the hook and the guide slope on the hook, the hook can rotate towards the side closer to the hanging shaft. The guide slope on the hook guides the hanging shaft, allowing the hook to be hung on the hanging slot.

[0018] 3. With the tension springs and pressure springs on both sides of the base, when the load wire rope breaks, the tension springs and pressure springs can drive the base to rotate towards the side closer to the hook, so that the transmission wire rope can transmit the falling signal to the hook in time. Attached Figure Description

[0019] Figure 1 This application mainly provides a schematic diagram of the overall structure of an anti-fall device for flexible doors;

[0020] Figure 2 This is a schematic diagram of the hook and base structure mainly provided in this application;

[0021] Figure 3 This is the existing method for installing the bottom beam and wire rope.

[0022] Reference numerals: 1. Bottom beam; 11. Pulley block; 111. Base; 111. Load-bearing movable pulley; 12. Load-bearing wire rope; 13. Limiting rod; 2. Door frame; 21. Hanging shaft; 3. Anti-fall component; 31. Hook; 311. Hanging groove; 312. Guide slope; 32. Transmission wire rope; 33. Compression spring; 4. Pressure detection component; 41. Tension spring; 42. Support rod; 43. Slide plate; 44. Compression spring. Detailed Implementation

[0023] In order to make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0024] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0025] This application discloses an anti-fall device for flexible doors.

[0026] Reference Figure 1 A fall prevention device for flexible doors includes a base beam 1 and a door frame 2, with the base beam 1 sliding within the door frame 2. A pulley block 11 and a load-bearing steel wire rope 12 are installed on the base beam 1, passing through the pulley block 11. In actual use, a motor drives the load-bearing steel wire rope 12 to lift the base beam 1. An anti-fall component 3 and a pressure detection component 4 are installed on the base beam 1. The pressure detection component 4 detects the pressure on the pulley block 11. When the load-bearing steel wire rope 12 breaks, the anti-fall component 3 reduces the risk of the base beam 1 falling.

[0027] The pulley block 11 is installed at a position other than the end of the bottom beam 1, and several pulley blocks 11 are spaced apart on the bottom beam 1. The load steel wire rope 12 corresponds to the pulley block 11. In use, the bottom beam 1 is lifted by several load steel wire ropes 12 and pulley blocks 11, which improves the convenience of lifting and lowering the bottom beam 1.

[0028] Reference Figure 2 Preferably, two sets of pulley blocks 11 are spaced apart on the bottom beam 1. Each pulley block 11 includes a base 111 and a load-bearing movable pulley 111. Two sets of bases 111 and load-bearing movable pulleys 111 are spaced apart. Both sets of bases 111 are rotatably mounted on the bottom beam 1, and the two sets of load-bearing movable pulleys 111 are rotatably mounted on their respective bases 111. In use, one end of the load-bearing wire rope 12 passes between the two sets of load-bearing movable pulleys 111, and the motor drives the bottom beam 1 to lift through the load-bearing wire rope 12 and the two sets of load-bearing movable pulleys 111.

[0029] Two sets of anti-fall components 3 are provided at intervals at both ends of the bottom beam 1. The two sets of anti-fall components 3 correspond to the two sets of pulley groups 11, and the structure and function of the two sets of anti-fall components 3 are the same. Only one set will be described below.

[0030] The anti-fall assembly 3 includes a hook 31, which is rotatably mounted on the base beam 1. A transmission steel wire rope 32 is provided between the hook 31 and the base 111, with one end of the transmission steel wire rope 32 connected to the hook 31 and the other end connected to the base 111. A compression spring 33 is provided between the hook 31 and the base beam 1, pressing against each other. When the load steel wire rope 12 is in the working state, the base 111 remains stable on the base beam 1, while the transmission steel wire rope 32 pulls the hook taut on the base beam 1. At this time, the compression spring 33 is in a compressed state.

[0031] A hanging shaft 21 is provided on the door frame 2. Several hanging shafts 21 are evenly spaced in the vertical direction of the door frame 2. When the load steel wire rope 12 breaks, the transmission steel wire rope 32 loses tension, and the hook 31 rotates towards the side closer to the hanging shaft 21 under the action of the compression spring 33. The hook 31 has a hanging groove 311 and a guide slope 312, which faces towards the side closer to the hanging groove 311. When the hook 31 rotates towards the side closer to the hanging shaft 21, the guide slope 312 on the hook 31 guides the hanging shaft 21, so that the hook 31 can be hung on the hanging shaft 21, reducing the risk of the bottom beam 1 falling.

[0032] To ensure the base 111 can react promptly after the load-bearing wire rope 12 breaks, the pressure detection assembly 4 includes a tension spring 41. The tension spring 41 is located on the side of the base 111 near the hook 31. One end of the tension spring 41 is connected to the bottom beam 1, and the other end is connected to the base 111. To better provide tension to the base 111, the angle between the tension spring 41 and the base 111 is 45 degrees. When the load-bearing wire rope 12 breaks, the tension spring 41 pulls the base 111 towards the hook, allowing the hook 31 to quickly rotate towards the side of the hanging shaft 21 under the action of the compression spring 33.

[0033] In addition, a support rod 42 is provided on the side of the base 111 opposite to the tension spring 41, and the axis of the support rod 42 is perpendicular to the base 111. One end of the support rod 42 is connected to the bottom beam 1, and the other end extends towards the side closer to the base 111. A sliding plate 43 is provided on the support rod 42, and the sliding plate 43 is sleeved on the support rod 42. A pressure spring 44 is provided between the sliding plate 43 and the bottom beam 1, and the pressure spring 44 is sleeved on the support rod 42. One end of the pressure spring 44 abuts against the sliding plate 43, and the other end abuts against the bottom beam 1. When the load wire rope 12 breaks, the pressure spring 44 pushes the base 111 towards the side closer to the hook 31 through the sliding plate 43. Through the arrangement of the pressure spring 44 and the tension spring 41, the base 111 can rotate towards the side of the hook 31 after losing the tension of the load wire rope 12, which greatly improves the convenience of hanging the hook 31 on the hanging shaft 21.

[0034] Since the pulley block 11 includes two sets of bases 111 and load movable pulleys 111, after the load wire rope 12 passes through the two load movable pulleys 111, in order to prevent the two sets of bases 111 and load movable pulleys 111 from rotating towards each other and affecting the tension of the load wire rope 12, in the initial state, the bases 111 are generally vertically arranged, and the bottom beam 1 is provided with a limit rod 13 between the two sets of bases 111. The limit rod 13 is generally horizontally arranged, and one end of the limit rod 13 is connected to the base 111, while the other end extends towards the side closer to the base 111 and abuts against the base 111, so that the base 111 can remain vertical and the load wire rope 12 can provide a better tension effect.

[0035] The implementation principle of the anti-fall device for flexible doors in this application embodiment is as follows: When the load wire rope 12 is working normally, its tension keeps the base 111 stable through the pulley block 11, and the transmission wire rope 32 pulls the hook 31 and compresses the compression spring 33; once the load wire rope 12 breaks, the tension spring 41 and the compression spring 44 immediately work together to push the base 111 to rotate and release the transmission wire rope 32. The compression spring 33 then pushes the hook 31 to rotate, and guides the hanging groove 311 to quickly hang on the hanging shaft 21 on the door frame 2 through the guide slope 312, thereby realizing mechanical self-locking and preventing the bottom beam 1 from falling.

[0036] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fall protection device for a flexible door comprising a bottom beam (1) and a door frame (2), characterized in that: A pulley block (11) is installed at a non-end position of the bottom beam (1), and a load steel wire rope (12) is threaded on the pulley block (11). The load steel wire rope (12) is used to drive the bottom beam (1) to lift. An anti-fall component (3) is installed on the side of the bottom beam (1) near the pulley block (11). The anti-fall component (3) is used to prevent the bottom beam (1) from falling, and the anti-fall component (3) is connected to the pulley block (11). A pressure detection component (4) is provided on the side of the bottom beam (1) near the pulley block (11). The pressure detection component (4) is used to detect the pressure of the pulley block (11).

2. A fall arrest device for a flexible door according to claim 1, characterised in that: The pulley block (11) includes several bases (111) and load movable pulleys (111). The bases (111) are rotatably mounted on the bottom beam (1), and the load movable pulleys (111) are rotatably mounted on the bases (111). The load wire rope (12) passes through the load movable pulleys (111).

3. A fall arrest device for a flexible door according to claim 2, characterised in that: The anti-fall component (3) includes a hook (31), which is rotatably mounted on the bottom beam (1). A compression spring (33) is provided between the hook (31) and the bottom beam (1). The compression spring (33) abuts against the hook (31) and the bottom beam (1). A transmission steel wire rope (32) is connected between the hook (31) body and the base (111). A hanging shaft (21) is provided on the door frame (2), and several hanging shafts (21) are spaced apart on the door frame (2).

4. A fall arrest device for a flexible door according to claim 3, wherein: The pressure detection assembly (4) includes a tension spring (41) located on the side of the base (111) near the hook (31). One end of the tension spring (41) is connected to the base (111), and the other end is connected to the bottom beam (1).

5. A fall arrest device for a flexible door according to claim 4, characterised in that: A support rod (42) is provided on one side of the base (111) relative to the tension spring (41). A sliding plate (43) is provided on the support rod (42). The sliding plate (43) abuts against the base (111). A pressure spring (44) is provided between the sliding plate (43) and the bottom beam (1). The pressure spring (44) abuts against the sliding plate (43) and the bottom beam (1).

6. A fall arrest device for a flexible door according to claim 5, wherein: The base (111) is provided with a limiting rod (13) on one side relative to the hook (31). One end of the limiting rod (13) is mounted on the bottom beam (1), and the other end extends toward the side close to the base (111).

7. A fall arrest device for a flexible door according to claim 3, wherein: The hook (31) has a hanging groove (311) and a guide slope (312) is formed on the hook (31), the guide slope (312) facing the inside of the hanging groove (311).

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