Tensioning mechanism, tensioning assembly and platform protection equipment

Abstract

The utility model relates to the technical field of rail transit protection, and discloses a tensioning mechanism, a tensioning assembly and platform protection equipment. The tensioning mechanism comprises a support; the driving part is rotatably arranged on the support, and the driving part is suitable for being connected with the other end of the guardrail rope and is suitable for winding the guardrail rope when being driven by external force to rotate; the ratchet wheel and the driving part are coaxially arranged, and the ratchet wheel is suitable for rotating along with rotation of the driving part; the limiting piece is rotatably arranged on the support, a clamping part is arranged at the end, close to the ratchet wheel, of the limiting piece, and the clamping part is suitable for being clamped with the ratchet wheel to limit rotation of the ratchet wheel; and the positioning piece is arranged on the bracket and is suitable for limiting the position of the limiting piece, so that the limiting piece is continuously clamped with the ratchet wheel. The tensioning mechanism provided by the utility model is convenient and rapid to operate, improves the efficiency of tensioning operation on the guardrail rope, and solves the problem that the tensioning efficiency is low due to tedious steps of the conventional guardrail rope tensioning mode.

Description

Technical Field

[0001] The utility model relates to the technical field of rail transportation protection, in particular to a tensioning mechanism, a tensioning component and platform protection equipment. Background Art

[0002] Currently, the area between the train platform and the train doors is often the most vulnerable to safety hazards and accidents when protecting railway platforms. After entering the platform, some passengers often chase, play, or ignore the danger, crossing the safety cordon before the train arrives or stops, leading to accidents. To address this, related technologies have installed multiple sets of columns at intervals along the platform's safety cordon, with soft isolation ropes installed between adjacent columns to confine passengers to a safe location.

[0003] In order to save construction costs, the spans between columns are large, and the guardrail rope is prone to falling after long-term use. Currently, most guardrail rope tensioning methods use fixed splints and other manual tools for tensioning, which is cumbersome and leads to low tensioning efficiency. Utility Model Content

[0004] In view of this, the present invention provides a tensioning mechanism to solve the problem that the current method of tensioning the guardrail rope is cumbersome and leads to low tensioning efficiency. At the same time, the present invention provides a tensioning assembly; and the present invention provides a platform protection device.

[0005] In the first aspect, the utility model provides a tensioning mechanism suitable for tensioning a guardrail rope with one end relatively fixed, the tensioning mechanism comprising: a bracket; a driving member rotatably arranged on the bracket, the driving member being suitable for connecting to the other end of the guardrail rope and being suitable for reeling up the guardrail rope when driven to rotate by an external force; a ratchet being coaxially arranged with the driving member and being suitable for rotating with the rotation of the driving member; a limiting member rotatably arranged on the bracket, the limiting member having a clamping portion provided at one end close to the ratchet, the clamping portion being suitable for clamping with the ratchet to limit the rotation of the ratchet; a positioning member provided on the bracket, the positioning member being suitable for limiting the position of the limiting member so that the limiting member is continuously clamped with the ratchet.

[0006] Beneficial effect: The utility model provides a tensioning mechanism, which reels the guardrail rope onto the driving member through the rotation of the driving member, and the ratchet coaxially arranged with the driving member avoids the limit member when the driving member rotates, and when the driving member stops rotating, it abuts against one of the tooth grooves in the ratchet through the clamping part, and limits the position of the limit member through the positioning member, thereby limiting the reverse rotation of the ratchet, avoiding the retraction of the guardrail rope, and realizing the tensioning operation of the guardrail rope. The tensioning mechanism provided by this solution is convenient and quick to operate, improves the efficiency of the tensioning operation of the guardrail rope, and solves the problem that the current method of tensioning the guardrail rope is cumbersome and leads to low tensioning efficiency.

[0007] In an optional embodiment, the driving member includes a driving shaft and a driving head, the driving shaft is suitable for connecting to the other end of the guardrail rope, and the driving head is suitable for being driven by external force to drive the driving shaft to rotate so that the driving shaft reels the guardrail rope.

[0008] Beneficial effects: The guardrail rope is connected through the drive shaft, which makes it easy to wind the guardrail rope on the drive shaft; the drive head receives external force to drive the drive shaft to rotate, thereby realizing the overall rotation drive of the drive component.

[0009] In an optional embodiment, a step portion is provided at one end of the drive shaft close to the drive head, and a through slot is provided in the middle of the ratchet, and the step portion is nested with the through slot so that the ratchet can rotate synchronously with the drive shaft.

[0010] Beneficial effect: By providing the step portion and the through groove, the transmission cooperation between the drive shaft and the drive head is achieved, so that the drive member drives the ratchet to rotate synchronously.

[0011] In an optional embodiment, the bracket includes a connecting plate and a first extension plate and a second extension plate extending in the same direction relative to the connecting plate, the drive shaft passes through the first extension plate and is rotatably connected to the second extension plate, and the drive head and the ratchet are located on the outside of the first extension plate.

[0012] Beneficial effects: The bracket is set to a "U"-shaped structure including a connecting plate, a first extension plate and a second extension plate, so that the internal space of the bracket can be used to install the drive shaft, and a storage space can be provided for the guardrail rope wound on the drive shaft. It is also convenient to use the first extension plate to install the drive head, ratchet, limit member and positioning member.

[0013] In an optional embodiment, the limiting member is located on the outer side of the first extension plate and is rotatably connected to the first extension plate via an axle pin, and a cotter pin is radially provided on the axle pin.

[0014] Beneficial effect: The rotation connection position of the limiting member is fixed by the shaft pin, and the limiting member is limited by the cotter pin to prevent the limiting member from being separated from the shaft pin.

[0015] In an optional embodiment, the drive head is configured as a polygonal structure.

[0016] Beneficial effect: The driving head is set to a polygonal structure, so that a polygonal inner groove wrench can be used to apply rotational force to the driving part.

[0017] In an optional embodiment, a plurality of mounting bolts are radially provided through the drive shaft, and the other end of the guardrail rope is suitable for being connected to the mounting bolts.

[0018] Beneficial effect: a plurality of mounting bolts are arranged in the radial direction of the drive shaft so as to facilitate the stable connection of the guardrail rope on the drive shaft.

[0019] In a second aspect, the utility model further provides a platform tensioning assembly, comprising: a guardrail rope; the tensioning mechanism described in the above scheme, wherein two tensioning mechanisms are provided and are respectively connected to the two ends of the guardrail rope.

[0020] Beneficial effects: The utility model also provides a platform tensioning assembly, which utilizes two relatively arranged tensioning mechanisms to simultaneously tension both ends of the guardrail rope, thereby further improving the tensioning efficiency.

[0021] On the third aspect, the utility model also provides a platform protection device, including: multiple columns; multiple lifting mechanisms, which are respectively arranged in the columns and can be lifted; the tensioning assembly described in the above scheme is arranged between two adjacent lifting mechanisms, and the tensioning assembly is arranged in multiple groups along the height direction of the lifting mechanism.

[0022] Beneficial effects: The utility model also provides a platform protection device, which drives the tensioning assembly to rise and fall by setting a lifting mechanism to realize the switching of the platform protection device between a protection state and an avoidance state that facilitates the passage of passengers; by setting multiple groups of tensioning assemblies, the distribution area of the guardrail rope in the tensioning assembly is increased to ensure the protection effect of the platform protection device.

[0023] In an optional embodiment, the platform protection device further includes: a protection tube, which is sleeved on the guardrail rope and arranged close to the tensioning mechanism of the tensioning assembly; and a protection tube buckle, which is connected between the protection tube and the tensioning mechanism.

[0024] Beneficial effect: By setting the protective tube, friction between the guardrail rope and the column is avoided when the lifting mechanism is raised or lowered, thereby protecting the guardrail rope. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 A structural diagram of a tensioning mechanism provided by the utility model;

[0027] Figure 2 A schematic diagram of the structure of the driving member provided by the utility model;

[0028] Figure 3 A schematic diagram of the structure of the ratchet provided by the utility model;

[0029] Figure 4 A structural schematic diagram of a tensioning assembly provided by the utility model;

[0030] Figure 5 This is a schematic diagram of the structure of a platform protection device provided by the present invention when several tensioning components are raised;

[0031] Figure 6 This is a schematic diagram of the structure of a platform protection device provided by the utility model when several tensioning components fall;

[0032] Figure 7 This is a schematic diagram of the structure of the lifting mechanism in the column provided by the utility model when it is raised;

[0033] Figure 8 for Figure 7 A partial enlarged schematic diagram;

[0034] Figure 9 This is a schematic diagram of the structure of the lifting mechanism in the column provided by the utility model when it falls;

[0035] Figure 10 for Figure 9 A partial enlarged schematic diagram of B in the figure.

[0036] Description of reference numerals:

[0037] 1. Bracket; 101. Connecting plate; 102. First extension plate; 103. Second extension plate; 2. Driving member; 201. Driving shaft; 202. Driving head; 203. Step portion; 3. Ratchet; 301. Through slot; 4. Stopper; 401. Axis pin; 402. Split pin; 5. Positioning member; 6. Mounting bolts;

[0038] 10. Guardrail rope; 20. Tensioning mechanism;

[0039] 100, column; 1001, narrow mouth; 200, lifting mechanism; 2001, chain; 300, tensioning assembly; 400, protective tube buckle; 500, protective tube. DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0041] The following combination Figures 1-10 , describing the embodiments of the present utility model.

[0042] According to an embodiment of the present invention, on the one hand, a tensioning mechanism is provided, which is suitable for tensioning a guardrail rope 10 with one end relatively fixed, such as Figure 1 As shown, the tensioning mechanism 20 includes: a bracket 1, a driving member 2, a ratchet 3, a limiting member 4 and a positioning member 5.

[0043] The driving member 2 is rotatably arranged on the bracket 1, and the driving member 2 is suitable for connecting the other end of the guardrail rope 10, and is suitable for reeling up the guardrail rope 10 when driven to rotate by external force; the ratchet 3 is coaxially arranged with the driving member 2, and is suitable for rotating with the rotation of the driving member 2; the limiting member 4 is rotatably arranged on the bracket 1, and the limiting member 4 is provided with a clamping portion at one end close to the ratchet 3, and the clamping portion is suitable for clamping with the ratchet 3 to limit the rotation of the ratchet 3; the positioning member 5 is arranged on the bracket 1, and the positioning member 5 is suitable for limiting the position of the limiting member 4, so that the limiting member 4 is continuously clamped with the ratchet 3.

[0044] In the above embodiment, the guardrail rope 10 is wound onto the driving member 2 by the rotation of the driving member 2, and the ratchet 3 coaxially arranged with the driving member 2 avoids the limit member 4 when the driving member 2 rotates. When the driving member 2 stops rotating, it abuts against one of the tooth grooves in the ratchet 3 through the clamping part, and limits the position of the limit member 4 through the positioning member 5, thereby limiting the reverse rotation of the ratchet 3, avoiding the retraction of the guardrail rope 10, and realizing the tensioning operation of the guardrail rope 10. The tensioning mechanism provided by this solution is easy and quick to operate, improves the efficiency of the tensioning operation of the guardrail rope 10, and solves the problem that the current method of tensioning the guardrail rope is cumbersome and leads to low tensioning efficiency.

[0045] Specifically, if Figure 1As shown, in this figure, the driving member 2 is driven by external force to rotate counterclockwise to reel in the guardrail rope 10; the outer periphery of the ratchet 3 is designed to deflect in the clockwise direction, and the driving member 2 is driven by external force to drive the ratchet 3 to rotate counterclockwise synchronously. At this time, the ratchet 3 can avoid the limiting member 4; the clamping part of the limiting member 4 is designed to imitate the tooth groove of the ratchet 3. When the driving member 2 stops rotating counterclockwise, the clamping part will be against one of the tooth grooves in the ratchet 3, and the current position of the limiting member 4 is maintained by the positioning member 5, thereby limiting the reverse rotation of the ratchet 3 and preventing the guardrail rope 10 from retracting.

[0046] Furthermore, if Figure 1 As shown, this embodiment does not limit the specific structure of the positioning member 5. In one embodiment, the positioning member 5 is configured as an elastic member such as a spring, and the position of the position limiting member 4 is maintained by the elastic force of the positioning member 5 against the position limiting member 4. In another embodiment, the positioning member 5 is configured as a fixing bolt that can be screwed onto the bracket 1, and the position of the position limiting member 4 is maintained by the blocking effect of the fixing bolt on the position limiting member 4. Figure 1 What is shown is the second implementation method of this embodiment. When tensioning operation is required, the positioning member 5 is unscrewed so that the driving member 2 can drive the ratchet 3 to move freely; when the guardrail rope 10 is wound into place, the positioning member 5 is screwed back in, and the positioning member 5 is used to block the limiting member 4, so that the limiting member 4 and the ratchet 3 are continuously engaged.

[0047] Furthermore, this embodiment does not limit the specific implementation method for relatively securing the guardrail rope 10 at the end remote from the tensioning mechanism. In one embodiment, the guardrail rope 10 at the end remote from the tensioning mechanism is directly secured, and tensioning the guardrail rope 10 is performed using only one tensioning mechanism. In another embodiment, the guardrail rope 10 at the end remote from the tensioning mechanism is also provided with a tensioning mechanism, and two tensioning mechanisms disposed opposite each other simultaneously tension both ends of the guardrail rope 10.

[0048] Furthermore, the guardrail rope 10 is configured as an aramid rope.

[0049] In some embodiments, as Figure 1 、 Figure 2 As shown, the driving member 2 includes a driving shaft 201 and a driving head 202. The driving shaft 201 is suitable for connecting to the other end of the guardrail rope 10, and the driving head 202 is suitable for being driven by external force to drive the driving shaft 201 to rotate so that the driving shaft 201 reels the guardrail rope 10.

[0050] In the above embodiment, the guardrail rope 10 is connected through the drive shaft 201, so that the guardrail rope 10 can be wound on the drive shaft 201; the drive head 202 receives external force to drive the drive shaft 201 to rotate, thereby realizing the overall rotation drive of the drive member 2.

[0051] Specifically, if Figure 1 、 Figure 2 As shown, this embodiment does not limit the specific method of connecting the guardrail rope 10 to the drive shaft 201. In one embodiment, through holes are provided along the radial direction of the drive shaft 201, and the guardrail rope 10 is passed through the through holes and circumferentially tied to the drive shaft 201. In another embodiment, threaded holes are provided along the radial direction of the drive shaft 201, and bolts are screwed into the partial structure, and the guardrail rope 10 is tied to the exposed portion of the bolt.

[0052] In some embodiments, as Figure 1-Figure 3 As shown, a step portion 203 is provided at one end of the drive shaft 201 close to the drive head 202, and a through slot 301 is provided in the middle of the ratchet 3. The step portion 203 is nested with the through slot 301 so that the ratchet 3 can rotate synchronously with the drive shaft 201.

[0053] In the above embodiment, the step portion 203 and the through slot 301 are provided to achieve transmission cooperation between the drive shaft 201 and the drive head 202 , so that the drive member 2 drives the ratchet 3 to rotate synchronously.

[0054] Specifically, if Figure 2 、 Figure 3 As shown, in this embodiment, the step portion 203 on the drive shaft 201 has a circumferentially approximately elliptical structure, and the through-slot 301 on the ratchet 3 has a circumferentially approximately elliptical structure that matches the step portion 203. In fact, the nested matching structure between the step portion 203 and the through-slot 301 is set to a non-circular structure, so that the drive member 2 can drive the ratchet 3 to rotate.

[0055] In some embodiments, as Figure 1 As shown, the bracket 1 includes a connecting plate 101 and a first extension plate 102 and a second extension plate 103 extending in the same direction relative to the connecting plate 101. The drive shaft 201 passes through the first extension plate 102 and is rotatably connected to the second extension plate 103. The drive head 202 and the ratchet 3 are located on the outside of the first extension plate 102.

[0056] In the above embodiment, the bracket 1 is configured to have a "U"-shaped structure including a connecting plate 101, a first extension plate 102 and a second extension plate 103, so that the internal space of the bracket 1 can be used to install the drive shaft 201, and to provide a storage space for the guardrail rope 10 wound on the drive shaft 201, and it is also convenient to use the first extension plate 102 to install the drive head 202, the ratchet 3, the limit member 4 and the positioning member 5.

[0057] Specifically, if Figure 1 As shown, after the drive shaft 201 passes through the first extension plate 102 , it is rotatably connected to the second extension plate 103 by overlapping or passing through, so as to ensure the stability of the installation of the drive shaft 201 .

[0058] Furthermore, if Figure 1 As shown, the connecting plate 101 is located away from the guardrail rope 10 , which makes it easy to use the connecting plate 101 to install the bracket 1 as a whole on the lifting mechanism 200.

[0059] In some embodiments, as Figure 1 As shown, the limiting member 4 is located outside the first extension plate 102 and is rotatably connected to the first extension plate 102 via an axle pin 401 . A cotter pin 402 is radially provided on the axle pin 401 .

[0060] In the above embodiment, the axis pin 401 is used to fix the rotation connection position of the limiting member 4 , and the cotter pin 402 is used to limit the limiting member 4 to prevent the limiting member 4 from being separated from the axis pin 401 .

[0061] Specifically, if Figure 1 As shown, during installation, the axle pin 401 is extended from the inside to the outside of the first extension plate 102. The structure of the axle pin 401 located on the inner side of the first extension plate 102 can abut against the first extension plate 102. The limit member 4 is connected to the protruding part of the axle pin 401, and then the cotter pin 402 is radially penetrated and set in the axle pin 401.

[0062] In some embodiments, as Figure 1 As shown, the drive head 202 is configured as a polygonal structure.

[0063] In the above embodiment, the driving head 202 is configured as a polygonal structure so that a polygonal inner groove wrench can be used to apply rotational force to the driving member 2 .

[0064] Specifically, if Figure 1 As shown, in this embodiment, the drive head 202 is configured as a hexagonal structure.

[0065] In some embodiments, as Figure 1 As shown, a plurality of mounting bolts 6 are radially provided through the drive shaft 201 , and the other end of the guardrail rope 10 is suitable for being connected to the mounting bolts 6 .

[0066] In the above embodiment, a plurality of mounting bolts 6 are provided in the radial direction of the driving shaft 201 so as to facilitate the stable connection of the guardrail rope 10 on the driving shaft 201 .

[0067] Specifically, if Figure 1 As shown, a threaded hole is provided along the radial direction of the driving shaft 201 and a part of the structure of the mounting bolt 6 is screwed into it, and the guardrail rope 10 is tied to the exposed part of the structure of the mounting bolt 6.

[0068] Furthermore, if Figure 1 As shown, in this embodiment, two mounting bolts 6 are provided.

[0069] According to an embodiment of the present invention, on the other hand, a platform tensioning assembly is also provided, such as Figure 4 As shown, it includes: a guardrail rope 10 and a tensioning mechanism 20 in the above embodiment. There are two tensioning mechanisms 20, which are connected to both ends of the guardrail rope 10 respectively.

[0070] In the above embodiment, two tensioning mechanisms arranged opposite to each other are used to simultaneously tension both ends of the guardrail rope 10, thereby further improving the tensioning efficiency.

[0071] According to an embodiment of the present invention, on the other hand, a platform protection device is provided, such as Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 As shown, it includes: multiple columns 100, multiple lifting mechanisms 200 and the tensioning assembly 300 in the above embodiment.

[0072] A plurality of lifting mechanisms 200 are respectively arranged in the column 100 in a liftable manner; a tensioning assembly 300 is arranged between two adjacent lifting mechanisms 200 , and a plurality of tensioning assemblies 300 are arranged along the height direction of the lifting mechanisms 200 .

[0073] In the above embodiment, a lifting mechanism 200 is provided to drive the tensioning assembly 300 to be lifted and lowered, so as to realize the switching of the platform protection equipment between a protective state and an avoidance state that facilitates the passage of passengers; by providing multiple groups of tensioning assemblies 300, the distribution area of the guardrail rope 10 in the tensioning assembly 300 is increased, thereby ensuring the protective effect of the platform protection equipment.

[0074] Specifically, when several tensioning components in the platform protection equipment are raised, such as Figure 5 As shown, at this time, the platform protection equipment is in an avoidance state that is convenient for passengers to pass through, and the tensioning components are raised to avoid, so as to facilitate getting on and off the bus; when several tensioning components in the platform protection equipment are lowered, such as Figure 6 As shown, the platform protection equipment is in the protection state at this time, and the tensioning assembly falls to protect passengers from approaching the edge of the platform.

[0075] Furthermore, if Figure 7 、 Figure 8 As shown, a chain 2001 is provided in the lifting mechanism 200 for moving the plurality of tensioning mechanisms 20 in the plurality of lifting mechanisms 200 apart from each other or closer to each other.

[0076] In some embodiments, as Figure 1 、 Figure 4 、 Figure 7 As shown, the platform protection equipment further includes: a protection tube 500 and a protection tube buckle 400 .

[0077] The protective tube 500 is sleeved on the guardrail rope 10 and is arranged close to the tensioning mechanism 20 of the tensioning assembly 300; the protective tube buckle 400 is connected between the protective tube 500 and the tensioning mechanism 20.

[0078] In the above embodiment, the protection tube 500 is provided to avoid friction between the guardrail rope 10 and the column 100 when the lifting mechanism 200 is raised or lowered, thereby protecting the guardrail rope 10.

[0079] Specifically, if Figure 1 、 Figure 4 As shown, one side of the protective tube buckle 400 is connected to the protective tube 500 through a clamping structure, and the other side is detachably clamped to the drive shaft 201 in the tensioning mechanism 20, so that the protective tube buckle 400 can be used to fix the installation position of the protective tube 500.

[0080] Furthermore, if Figure 7 As shown, the position where the guardrail rope 10 extends out of the column 100 is set as a narrow opening 1001. By installing a protective tube 500 on the guardrail rope 10, the guardrail rope 10 is prevented from contacting the edge of the narrow opening 1001 during the lifting process, thereby protecting the guardrail rope 10.

[0081] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A tensioning mechanism, suitable for tensioning a guardrail rope (10) with one end relatively fixed, characterized in that: The tensioning mechanism (20) comprises: Bracket (1); A driving member (2) is rotatably arranged on the bracket (1), the driving member (2) being suitable for connecting to the other end of the guardrail rope (10) and being suitable for reeling in the guardrail rope (10) when driven to rotate by an external force; a ratchet (3) coaxially arranged with the driving member (2) and adapted to rotate with the rotation of the driving member (2); A limiting member (4) is rotatably arranged on the bracket (1); an end of the limiting member (4) close to the ratchet (3) is provided with a clamping portion, and the clamping portion is suitable for clamping with the ratchet (3) to limit the rotation of the ratchet (3); A positioning member (5) is provided on the bracket (1), and the positioning member (5) is suitable for limiting the position of the limiting member (4) so that the limiting member (4) and the ratchet (3) are continuously engaged.

2. The tensioning mechanism according to claim 1, characterized in that: The driving member (2) comprises a driving shaft (201) and a driving head (202), wherein the driving shaft (201) is adapted to be connected to the other end of the guardrail rope (10), and the driving head (202) is adapted to be driven by an external force to drive the driving shaft (201) to rotate, so that the driving shaft (201) reels the guardrail rope (10).

3. The tensioning mechanism according to claim 2, characterized in that: A step portion (203) is provided at one end of the drive shaft (201) close to the drive head (202), a through slot (301) is provided in the middle of the ratchet (3), and the step portion (203) is nested with the through slot (301) so that the ratchet (3) can rotate synchronously with the drive shaft (201).

4. The tensioning mechanism according to claim 3, characterized in that: The bracket (1) comprises a connecting plate (101) and a first extension plate (102) and a second extension plate (103) extending in the same direction relative to the connecting plate (101); the drive shaft (201) passes through the first extension plate (102) and is rotatably connected to the second extension plate (103); the drive head (202) and the ratchet (3) are located outside the first extension plate (102).

5. The tensioning mechanism according to claim 4, characterized in that: The limiting member (4) is located outside the first extension plate (102) and is rotatably connected to the first extension plate (102) via an axle pin (401). A split pin (402) is radially provided on the axle pin (401).

6. The tensioning mechanism according to claim 3, characterized in that: The driving head (202) is configured as a polygonal structure.

7. The tensioning mechanism according to claim 3, characterized in that: The drive shaft (201) is radially penetrated by a plurality of mounting bolts (6), and the other end of the guardrail rope (10) is suitable for being connected to the mounting bolts (6).

8. A platform tensioning assembly, characterized in that: include: guardrail rope (10); The tensioning mechanism (20) according to any one of claims 1 to 7, wherein two tensioning mechanisms (20) are provided and are respectively connected to the two ends of the guardrail rope (10).

9. A platform protection device, characterized in that: include: a plurality of columns (100); A plurality of lifting mechanisms (200) are respectively arranged in the columns (100) in a liftable manner; The tensioning assembly (300) described in claim 8 is arranged between two adjacent lifting mechanisms (200), and multiple groups of the tensioning assemblies (300) are arranged along the height direction of the lifting mechanisms (200).

10. The platform protection device according to claim 9, characterized in that: Also includes: A protective tube (500) is sleeved on the guardrail rope (10) and is disposed close to the tensioning mechanism (20) of the tensioning assembly (300); The protective tube buckle (400) is connected between the protective tube (500) and the tensioning mechanism (20).

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