A safety fall arrest braking structure

Abstract

This invention provides a safe anti-fall braking structure, relating to the field of roller door structure technology. It includes a fixed base plate and a rotating cover plate, with a ratchet and rollers positioned between them. A receiving cavity is formed inside the rotating cover plate, with limit slots on both sides of the upper end of the cavity. The two limit slots are symmetrically arranged, and the curvature of the end of the limit slot closer to the upper end of the cavity is greater than that of the end farther from the upper end. This allows the rollers to be engaged between the ends of the ratchet and the limit slots under centrifugal force. A travel groove is provided at the upper end of the rotating cover plate, and a travel switch that cooperates with the travel groove is provided on the fixed base plate. This invention uses symmetrically arranged limit slots at both ends, with different curvatures at the two ends, effectively engaging the rollers in both directions under centrifugal force. This results in more uniform braking force, less wear on the rotating cover plate, a longer service life, and the ability to perform multiple safe braking maneuvers.

Description

Technical Field

[0001] This invention relates to the field of rolling door structure technology, and in particular, to a safety anti-fall braking structure. Background Technology

[0002] Electric roller shutter doors and windows have been widely used by customers in homes and public buildings for their anti-theft function. Most roller shutter doors on the market are motor-driven and controllable. The opening and closing of roller shutter doors is mostly upward rolling. During the lifting and lowering process of this type of roller shutter door, the power transmission components may malfunction, such as brake failure, deceleration device failure, or transmission chain breakage. This poses a risk that the roller shutter door may fall and hit pedestrians below after opening. Therefore, the fall prevention safety of roller shutter doors is of great importance.

[0003] Existing fall prevention safety devices for rolling door motors, such as the Chinese Utility Model Patent CN213205516U, disclose a fall prevention safety device for a rolling door motor, which includes a base, an end cap, a cylindrical roller, a ratchet, and a bearing. The end cap is mounted on the base and can be rotated a certain angle on the base before being limited. A cavity is formed between the base and the end cap to accommodate the cylindrical roller and the ratchet. The upper part of the cavity extends radially outward into an arc segment. Each ratchet tooth of the ratchet has guide grooves on both sides. The two ends of the arc segment are respectively designated as circumferential end ends. Under the action of centrifugal force, the cylindrical roller can be locked at the circumferential end ends of the arc segment. The base is mounted on the side plate of the rolling door motor, the roller shaft of the rolling door motor is mounted on the ratchet, and the ratchet is mounted in the cavity through the bearing. This utility model has a simple structure, is easy to install, and eliminates the need for a support bearing on the inner side of the side plate; at the same time, the installation does not require attention to its rotation direction.

[0004] However, the above-mentioned anti-fall safety devices still have the following problems: when the roller door falls too fast, the end cover deflects under the action of the cylindrical roller during instantaneous braking, and the braking is performed in two directions using only one arc segment. This results in poor wear resistance, short service life, and significant damage to the end cover during braking, leading to poor safety when braking again.

[0005] Therefore, in order to solve the above problems, it is necessary for us to design a reasonable and efficient safety anti-fall braking structure. Summary of the Invention

[0006] The purpose of this invention is to provide a safe anti-fall braking structure, which adopts a limiting groove symmetrically arranged at both ends, and the curvature of the limiting groove at both ends is different, so as to effectively clamp the roller in two directions under the action of centrifugal force, resulting in more uniform braking force, less wear on the rotating cover plate, longer service life, and multiple safe braking operations.

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

[0008] A safety anti-fall braking structure includes a fixed base plate and a rotating cover plate disposed on the fixed base plate. A ratchet for connecting to a rotating shaft and a roller cooperating with the ratchet are disposed between the fixed base plate and the rotating cover plate. A receiving cavity for accommodating the roller and the ratchet is formed on the inner side of the rotating cover plate. Limiting grooves are respectively provided on both sides of the upper end of the receiving cavity. The two limiting grooves are symmetrically arranged, and the curvature of the limiting groove near the upper end of the receiving cavity is greater than the curvature of the limiting groove away from the upper end of the receiving cavity, so that the roller is locked between the ends of the ratchet and the limiting grooves under the action of centrifugal force. A travel groove is provided at the upper end of the rotating cover plate, and a travel switch for engaging into the travel groove is provided on the fixed base plate.

[0009] As a preferred embodiment of the present invention, the ratchet is provided with a first groove for accommodating the roller, and a second groove is provided on both sides of the first groove, the depth of the second groove being less than the depth of the first groove.

[0010] As a preferred embodiment of the present invention, a buffer pad layer is provided on the inner side of the first card slot.

[0011] As a preferred embodiment of the present invention, the fixed base plate is provided with a limiting pin extending toward the rotating cover plate, and the rotating cover plate is provided with a pin groove for facilitating the insertion of the limiting pin. There are two limiting pins and two pin grooves, and the two pin grooves are symmetrically arranged on both sides of the rotating cover plate.

[0012] As a preferred embodiment of the present invention, the fixed base plate is provided with a pin hole for installing the limiting pin. The limiting pin includes a main column and an end column disposed at the end of the main column. The outer diameter of the end column is larger than the outer diameter of the main column. The end of the pin hole away from the rotating cover plate is provided with an end column groove for accommodating the end column.

[0013] As a preferred embodiment of the present invention, the rotating cover plate is connected to the fixed base plate by a first bolt, and the fixed base plate is provided with a first groove for facilitating the sliding of the first bolt, and the number of the first bolt and the first groove is at least two.

[0014] As a preferred embodiment of the present invention, the ratchet is provided with a pivot hole at its center for connection with a rotating shaft, the rotating shaft is provided with a protrusion on its outer side, and the pivot hole is provided with a groove on its inner sidewall for engaging with the protrusion.

[0015] As a preferred embodiment of the present invention, the ratchet is provided with a bearing for connecting with the rotating cover plate, and a level detector is provided above the limit switch.

[0016] As a preferred embodiment of the present invention, the fixed base plate is provided with mounting holes, and the number of mounting holes is at least two.

[0017] As a preferred embodiment of the present invention, the mounting hole is provided with a mounting base by means of mounting bolts.

[0018] The beneficial effects of the safety anti-fall braking structure of the present invention are as follows:

[0019] 1. The limiting grooves are symmetrically set at both ends, and the curvature of the limiting grooves at both ends is different. This effectively clamps the rollers in two directions under the action of centrifugal force, resulting in more uniform braking force, less wear on the rotating cover plate, longer service life, and the ability to perform multiple safe braking operations.

[0020] 2. Two sets of symmetrical left and right limit pins are used to limit the rotation of the rotating cover plate. When the rotating cover plate rotates, the force on both sides is even, the force on the rotating cover plate is better, it is not easy to cause lateral displacement, and the safety is higher.

[0021] 3. A buffer pad is provided at the first groove where the roller falls back at the ratchet, so that the noise is less and the wear is less when the whole device is in normal use (without braking), and the structure of the roller is guaranteed.

[0022] 4. A level detector is installed above the limit switch to ensure that the limit switch is located above the entire ratchet, and to further ensure that the two limit slots and limit pins are symmetrically arranged, resulting in higher braking safety;

[0023] 5. The limit pin is set as a stepped structure, which has higher connection strength for the pin hole at the fixed base plate. When the roller is stuck, the limit pin will hit the end of the pin groove when the cover plate is rotated. The stepped structure limit pin with higher connection strength has higher stability and is not easy to be damaged.

[0024] 6. The fixed base plate offers more installation options, making it suitable for various installation scenarios. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of one embodiment of a safety fall arrestor braking structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of a safety anti-fall braking structure of the present invention when the rotating cover is hidden;

[0027] Figure 3 This is a schematic diagram of the cooperation between the rotating cover plate and the ratchet in one embodiment of a safety anti-fall braking structure of the present invention;

[0028] Figure 4This is a schematic diagram of the fixed base plate in one embodiment of a safety anti-fall braking structure of the present invention;

[0029] Figure 5 This is a schematic diagram of the rotating cover plate in one embodiment of a safety anti-fall braking structure of the present invention;

[0030] Figure 6 This is a schematic diagram of the ratchet structure in one embodiment of a safety anti-fall braking structure of the present invention;

[0031] Figure 7 This is a schematic diagram of the limiting pin in one embodiment of a safety anti-fall braking structure of the present invention;

[0032] In the diagram: 1. Fixed base plate, 11. Limit switch, 111. Horizontal detector, 12. First slide groove, 13. Limit pin, 131. Main column, 132. End column, 14. Pin hole, 141. End column groove, 15. Mounting hole, 151. Mounting base, 2. Rotating cover plate, 21. Receiving cavity, 211. Limiting slot, 212. Bearing cavity, 22. Stroke groove, 23. First bolt, 3. Ratchet, 31. First slot, 311. Buffer pad, 32. Second slot, 33. Shaft hole, 331. Groove, 34. Bearing, 4. Roller. Detailed Implementation

[0033] The following are specific embodiments of the present invention, which further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0034] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement and steps of the modules and steps set forth in these embodiments do not limit the scope of the invention.

[0035] At the same time, it should be understood that, for ease of description, the process shown in the attached diagram is not performed in isolation, but rather involves multiple steps that overlap.

[0036] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0038] Techniques, methods, and systems known to a person skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the license specification.

[0039] Example 1: As Figures 1 to 7 The image shown is merely one embodiment of the present invention. A safety anti-fall braking structure includes a fixed base plate 1 and a rotating cover plate 2 disposed on the fixed base plate 1. A ratchet 3 for connecting to a rotating shaft and a roller 4 cooperating with the ratchet 3 are disposed between the fixed base plate 1 and the rotating cover plate 2. A receiving cavity 21 for accommodating the roller 4 and the ratchet 3 is formed on the inner side of the rotating cover plate 2. Limiting grooves 211 are respectively provided on both sides of the upper end of the receiving cavity 21. The two limiting grooves 211 are symmetrically arranged, and the curvature of the end of the limiting groove 211 near the upper end of the receiving cavity 21 is greater than the curvature of the end of the limiting groove 211 away from the upper end of the receiving cavity 21, so that the roller 4 is stuck between the ends of the ratchet 3 and the limiting grooves 211 under the action of centrifugal force. A travel groove 22 is provided on the upper end of the rotating cover plate 2, and a travel switch 11 for engaging into the travel groove 22 is provided on the fixed base plate 1.

[0040] In this invention, a fixed base plate 1 is fixedly installed, while a rotating cover plate 2 is movably installed on the fixed base plate 1 and can rotate on the fixed base plate 1. A ratchet 3 is also provided between the rotating cover plate 2 and the fixed base plate 1, and a roller 4 is provided at the ratchet 3. When the roller door falls, the rotating shaft rotates too fast, and the roller 4 rotates out from the ratchet 3 under the action of centrifugal force and abuts against the rotating cover plate 2, causing the rotating cover plate 2 to deflect. The limit switch 11 disengages from the limit groove 22 and drives the roller door braking unit to brake the roller door, stop the roller door from falling further, and ensure the safety of pedestrians below.

[0041] First, regarding the structure of the ratchet 3, it is positioned between the fixed base plate 1 and the rotating cover plate 2. A roller 4 is provided at the ratchet 3, and a first groove 31 is provided to accommodate the roller 4. Second grooves 32 are provided on both sides of the first groove 31, with the depth of the second grooves 32 being less than the depth of the first groove 31. The ratchet 3 is connected to the rotating shaft of the roller door. When the roller door is operating normally, the rotation speed of the rotating shaft is within a predetermined value, and the roller 4 will not disengage from the first groove 31, or if it does, it will return to the first groove 31 under gravity. However, when the roller door falls, the rotating shaft rotates too fast, causing the ratchet 3 to rotate too fast as well. The centrifugal force on the roller 4 exceeds its own weight, causing the roller 4 to disengage from the first groove 31 and become lodged between the second groove 32 and the rotating cover plate 2, thus allowing the rotating cover plate 2 and the ratchet 3 to rotate synchronously.

[0042] Next is the structure of the rotating cover plate 2. The inner side of the rotating cover plate 2 forms a receiving cavity 21 for accommodating the roller 4 and the ratchet 3. Limiting grooves 211 are respectively provided on both sides of the upper end of the receiving cavity 21. The two limiting grooves 211 are symmetrically arranged, and the curvature of the end of the limiting groove 211 near the upper end of the receiving cavity 21 is greater than the curvature of the end of the limiting groove 211 away from the upper end of the receiving cavity 21, so that the roller 4 is stuck between the end of the ratchet 3 and the end of the limiting groove 211 under the action of centrifugal force.

[0043] Here, both limiting slots 211 are located in the upper part of the receiving cavity 21, and the two limiting slots 211 are symmetrical. The inner diameter of the receiving cavity 21 is slightly larger than the outer diameter of the ratchet 3. Therefore, except for the area of ​​the limiting slot 211, the roller 4 will not be separated from the first slot 31 due to the limiting of the inner wall of the receiving cavity 21. When the roller 4 rolls to the area of ​​the limiting slot 211, if the ratchet 3 rotates too fast, the roller 4 will be subjected to centrifugal force greater than its own weight. Then the roller 4 will be separated from the first slot 31 and reach the limiting slot 211, and will be stuck between the end of the second slot 32 and the limiting slot 211, so that the rotating cover plate 2 and the ratchet 3 rotate synchronously.

[0044] It should be noted that the curvature of the end of the limiting groove 211 near the upper end of the receiving cavity 21 is greater than the curvature of the end of the limiting groove 211 away from the upper end of the receiving cavity 21. Since the limiting groove 211 is located on the side of the receiving cavity 21, the limiting groove 211 can be divided into an upper end and a lower end. The curvature of the upper end of the limiting groove 211 is greater than that of the lower end. That is, the radius of the arc-shaped part at the upper end is small, and the radius of the arc-shaped part at the lower end is large. The roller 4 can pass through the lower end of the limiting groove 211 more easily, but it is easy to get stuck at the upper end of the limiting groove 211.

[0045] When the ratchet 3 rotates too fast, the roller 4 is prone to getting stuck between the upper ends of the second slot 32 and the limiting slot 211; and since there are two limiting slots 211, which are used to lock the ratchet 3 in two different directions, Figure 3 For example, when the ratchet 3 rotates too fast clockwise, the roller 4 is stuck between the upper end of the left limit groove 211 and the second groove 32; conversely, when the ratchet 3 rotates too fast counterclockwise, the roller 4 is stuck between the upper end of the right limit groove 211 and the second groove 32.

[0046] Furthermore, due to the presence of two limiting slots 211, when the ratchet 3 rotates too fast clockwise, while the roller 4 is stuck between the upper end of the left limiting slot 211 and the second slot 32, the lower end of the right limiting slot 211 will also be swept by the roller 4. Since the lower end of the right limiting slot 211 is relatively smooth, the roller 4 will not get stuck. However, due to the high rotation speed of the roller 4, the roller 4 will still exert a certain pressure on the lower end of the right limiting slot 211, which is used to share the rotational force of the roller 4 between the upper end of the left limiting slot 211 and the second slot 32, driving the rotating cover plate 2 to rotate. This is equivalent to the two limiting slots 211 working together to drive the rotating cover plate 2 to rotate. The two limiting slots 211, one main and one secondary, make the force on the rotating cover plate 2 more buffered and even when it rotates.

[0047] Finally, there is the cooperation between the fixed base plate 1 and the rotating cover plate 2. The upper end of the rotating cover plate 2 is provided with a travel groove 22. The fixed base plate 1 is provided with a travel switch 11 for engaging in the travel groove 22. The contacts of the travel switch 11 extend into the travel groove 22. Once the roller 4 engages and rotates the rotating cover plate 2, the rotation of the rotating cover plate 2 causes the travel groove 22 to deviate. The contacts of the travel switch 11 disengage from the travel groove 22, forming a certain pressure. The travel switch 11 is triggered, thereby driving the roller door brake component electrically connected to the travel switch 11 to work and brake the roller door.

[0048] Furthermore, to facilitate the rotation of the rotating cover plate 2 on the fixed base plate 1, the fixed base plate 1 is provided with a limiting pin 13 extending towards the rotating cover plate 2, and the rotating cover plate 2 is provided with a pin groove 24 for facilitating the insertion of the limiting pin 13; the pin groove 24 is arc-shaped, and the arc bending direction of the pin groove 24 is centered on the axis of the ratchet 3, and the limiting pin 13 can only slide within the pin groove 24, thereby limiting the rotation direction of the rotating cover plate 2, and the rotating cover plate 2 and the ratchet 3 can rotate coaxially.

[0049] Here, there are two of each of the limiting pins 13 and pin slots 24, and the two pin slots 24 are symmetrically arranged on both sides of the rotating cover plate 2. The rotation of the rotating cover plate is limited by two sets of symmetrical limiting pins. When the rotating cover plate rotates, the force on both sides is uniform, the force on the rotating cover plate is better, it is not easy to cause lateral displacement, and the safety is higher.

[0050] Example 2, still as Figures 1 to 7 The illustration shown is only one embodiment of the present invention. Based on the first embodiment, in the safety anti-fall braking structure of the present invention, a buffer pad 311 is provided on the inner side of the first slot 31. Here, the buffer pad 311 is generally made of silicone, which has low installation cost and good buffering effect. In this way, the buffer pad is provided at the first slot 31 where the roller 4 of the ratchet 3 falls back. This ensures that when the entire device is in normal use (without braking), even if the ratchet 3 disengages from the first slot 31 and reaches the limit slot 211, the rotation speed of the ratchet 3 is not fast enough, and the roller 4 will still fall back into the first slot 31 under gravity. The noise during the fall is smaller, the wear is smaller, and the structure of the roller is guaranteed.

[0051] Furthermore, the fixed base plate 1 is provided with a pin hole 14 for installing the limiting pin 13. The limiting pin 13 includes a main column 131 and an end column 132 disposed at the end of the main column 131. The outer diameter of the end column 132 is larger than the outer diameter of the main column 131. The end of the pin hole 14 away from the rotating cover plate 2 is provided with an end column groove 141 for accommodating the end column 132.

[0052] In other words, by setting the limiting pin 13 as a stepped structure, the connection strength of the pin hole 14 at the fixed base plate 1 is higher. When the roller 4 is stuck, the limiting pin will hit the end of the pin groove 24 when the rotating cover plate 2 rotates. The stepped structure limiting pin 13 with higher connection strength is more stable and less prone to damage.

[0053] Furthermore, the rotating cover plate 2 is connected to the fixed base plate 1 by a first bolt 23. The fixed base plate 1 is provided with a first groove 12 for facilitating the sliding of the first bolt 23. The number of the first bolt 23 and the first groove 12 is at least two, to prevent the rotating cover plate 2 from detaching from the fixed base plate 1.

[0054] Furthermore, the ratchet 3 has a pivot hole 33 at its center for connecting with the rotating shaft, a protrusion on the outer side of the rotating shaft, and a groove 331 on the inner sidewall of the pivot hole 33 for engaging with the protrusion.

[0055] Here, the ratchet 3 is provided with a bearing 34 for connecting with the rotating cover plate 2; of course, the middle of the receiving cavity 21 is provided with a bearing cavity 212, the bearing cavity 212 is protruding on the side of the middle of the receiving cavity 21 away from the fixed base plate 1, and the bearing 34 is provided inside the bearing cavity 212 and connected to the ratchet 3, so that the ratchet 3 can be driven to rotate by the rotating shaft under the limitation of the bearing 34.

[0056] In this invention, a horizontal detector 111 is provided above the limit switch 11. This ensures that the limit switch 11 is located above the entire ratchet 3, that is, the travel groove 22 is located directly above the rotating cover plate 2. This further ensures that the two limit slots 211 and the limit pin 13 are symmetrically arranged, resulting in higher braking safety.

[0057] Finally, the fixed base plate 1 is provided with mounting holes 15, and the number of mounting holes 15 is at least two. In fact, multiple mounting holes 15 are evenly arranged around the circumference of the fixed base plate 1.

[0058] The fixed base plate 1 can be directly fixed to the wall, the side of the support column, or the side of the support frame by setting mounting bolts through the mounting holes 15.

[0059] Of course, the mounting holes 15 are connected to the mounting bases 151 by mounting bolts. Generally, the mounting bases 151 are connected to the two mounting holes 15 on the lower side of the fixed base plate 1. The mounting bases 151 are set on the support platform or support frame, so the whole device is mounted on a pedestal.

[0060] This allows for more diverse installation methods for the fixed base plate, including flat mounting or pedestal mounting, suitable for different installation scenarios.

[0061] This invention discloses a safety anti-fall braking structure, which adopts a limiting groove symmetrically arranged at both ends, with different curvatures at both ends of the limiting groove. This effectively clamps the rollers rotating in two directions under centrifugal force, resulting in more uniform braking force, less wear on the rotating cover plate, longer service life, and the ability to perform multiple safety braking operations.

[0062] This invention is not limited to the specific embodiments described above, and various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made to the above embodiments based on the technical essence of this invention should be included within the scope of protection of this invention.

Claims

1. A safety anti-fall braking structure, characterized in that: The device includes a fixed base plate (1) and a rotating cover plate (2) disposed on the fixed base plate (1). A ratchet (3) for connecting to a rotating shaft and a roller (4) cooperating with the ratchet (3) are disposed between the fixed base plate (1) and the rotating cover plate (2). A receiving cavity (21) for accommodating the roller (4) and the ratchet (3) is formed on the inner side of the rotating cover plate (2). Limiting grooves (211) are respectively provided on both sides of the upper end of the receiving cavity (21). The two limiting grooves (211) are positioned opposite each other on the left and right sides. The limit groove (211) is configured such that the curvature of the end of the limit groove (211) near the upper end of the receiving cavity (21) is greater than the curvature of the end of the limit groove (211) away from the upper end of the receiving cavity (21), so that the roller (4) is stuck between the ratchet (3) and the upper end of the limit groove (211) under the action of centrifugal force. The upper end of the rotating cover plate (2) is provided with a stroke groove (22), and the fixed base plate (1) is provided with a limit switch (11) for being inserted into the stroke groove (22). The ratchet (3) is provided with a first groove (31) for accommodating the roller (4), and a second groove (32) is provided on both sides of the first groove (31), the depth of the second groove (32) being less than the depth of the first groove (31); When the roller door falls, the rotating shaft rotates too fast, the ratchet rotates too fast, and the roller gets stuck between the upper ends of the second slot and the limit slot; and the two limit slots are used to lock the ratchet in two directions respectively. Furthermore, when the ratchet rotates too fast clockwise or counterclockwise, the roller gets stuck between the upper end of the left limiting groove and the second groove, or between the upper end of the right limiting groove and the second groove. At the same time, the roller also passes over the lower end of the right limiting groove or the lower end of the left limiting groove. Because the lower end of the right limiting groove or the lower end of the left limiting groove has a small curvature, the roller will not get stuck. However, the roller will still exert pressure on the lower end of the right limiting groove or the lower end of the left limiting groove, which is used to distribute the rotational force of the roller between the upper end of the left limiting groove and the second groove, or between the upper end of the right limiting groove and the second groove, thus driving the rotating cover to rotate. The two limiting grooves drive the rotating cover to rotate together, making the force on the rotating cover more even when it rotates.

2. The safety anti-fall braking structure according to claim 1, characterized in that: A buffer pad (311) is provided on the inner side of the first card slot (31).

3. The safety anti-fall braking structure according to claim 1, characterized in that: The fixed base plate (1) is provided with a limiting pin (13) extending toward the rotating cover plate (2), and the rotating cover plate (2) is provided with a pin groove (24) for facilitating the insertion of the limiting pin (13). There are two limiting pins (13) and two pin grooves (24), and the two pin grooves (24) are symmetrically arranged on both sides of the rotating cover plate (2).

4. The safety anti-fall braking structure according to claim 3, characterized in that: The fixed base plate (1) is provided with a pin hole (14) for installing the limiting pin (13). The limiting pin (13) includes a main column (131) and an end column (132) provided at the end of the main column (131). The outer diameter of the end column (132) is larger than the outer diameter of the main column (131). The end of the pin hole (14) away from the rotating cover plate (2) is provided with an end column groove (141) for accommodating the end column (132).

5. A safety anti-fall braking structure according to claim 1, characterized in that: The rotating cover plate (2) is connected to the fixed base plate (1) by the first bolt (23). The fixed base plate (1) is provided with a first groove (12) for facilitating the sliding of the first bolt (23). The number of the first bolt (23) and the first groove (12) is at least two.

6. The safety anti-fall braking structure according to claim 1, characterized in that: The ratchet (3) has a pivot hole (33) at its center for connecting with the rotating shaft. The rotating shaft has a protrusion on its outer side and a groove (331) on its inner sidewall for engaging with the protrusion.

7. A safety anti-fall braking structure according to claim 6, characterized in that: The ratchet (3) is provided with a bearing (34) for connecting with the rotating cover plate (2), and a level detector (111) is provided above the limit switch (11).

8. The safety anti-fall braking structure according to claim 1, characterized in that: The fixed base plate (1) is provided with mounting holes (15), and the number of mounting holes (15) is at least two.

9. A safety anti-fall braking structure according to claim 8, characterized in that: The mounting hole (15) is provided with a mounting base (151) connected by mounting bolts.

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