A movable deck structure to prevent detachment

Abstract

This invention discloses a movable deck structure designed to prevent detachment, comprising a fixed deck, a movable deck, and several anti-detachment tie rods. The movable deck is located below the fixed deck. Each anti-detachment tie rod includes a first tie rod, a second tie rod, and a connector. One end of the first tie rod is hinged to the fixed deck, and the other end is hinged to the second tie rod via the connector. The other end of the second tie rod is hinged to the movable deck, allowing the first and second tie rods to rotate and fold relative to each other. The first and / or second tie rods have several connection points spaced apart along their length that mate with the connector. The connectors hinge to these connection points at different locations, allowing the anti-detachment tie rods to have different lengths. The anti-detachment tie rods provide multi-point support for the movable deck, ensuring even stress distribution and preventing tilting or falling.

Description

Technical Field

[0001] This application relates to the field of marine technology, and in particular to a movable deck structure. Background Technology

[0002] Ro-Ro ships require the installation of ro-ro equipment, such as lifting platforms, ramps, bow / stern ramps, and movable decks, to facilitate vehicle entry and exit and movement between vehicle decks. Movable decks, a commonly used ro-ro device, are located in the middle of the hull, similar to a mezzanine. By controlling the raising and lowering of the movable deck, various parking methods can be implemented, offering flexibility. Specifically, when vehicles are low, the movable deck can be adjusted to a working position between the upper and lower fixed decks (i.e., the middle position). At this time, cars can be parked on both the fixed deck below and the movable deck. When taller vehicles need to be parked, the movable deck is raised, allowing taller vehicles to be parked on the lower fixed deck.

[0003] To achieve the raising and lowering of the movable deck, a hydraulic lifting device is typically installed between the upper and lower fixed decks. The movable deck is connected to the hydraulic lifting device, which drives its raising and lowering. Simultaneously, lateral supports are fixedly installed on the ship's pillars corresponding to the working position of the movable deck. After the movable deck is lowered to the working position, it abuts against these lateral supports. The support from these lateral supports allows the movable deck to remain stable even after the hydraulic system's power is removed. However, the fixed installation of the lateral supports means that the movable deck can only be lowered to a fixed height, and its working height cannot be adjusted according to the height of parked vehicles. Furthermore, the lateral supports can only be installed on the ship's pillars. If it cannot be guaranteed that there are pillars on all four sides of the movable deck to provide support, uneven stress can easily occur, leading to problems such as the movable deck tilting or even falling. Summary of the Invention

[0004] The purpose of this invention is to provide a movable deck structure that can solve the above-mentioned problems existing in the prior art.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] A movable deck structure for preventing detachment includes a fixed deck, a movable deck, and a plurality of anti-detachment tie rods. The movable deck is located below the fixed deck. Each anti-detachment tie rod includes a first tie rod, a second tie rod, and a connector. One end of the first tie rod is hinged to the fixed deck, and the other end is hinged to the second tie rod via the connector. The other end of the second tie rod is hinged to the movable deck, allowing the first tie rod and the second tie rod to rotate and fold relative to each other. The first tie rod and / or the second tie rod are provided with a plurality of connection positions that mate with the connector at intervals along their own length. The connectors are hinged to the connection positions at different locations, allowing the anti-detachment tie rods to have different lengths.

[0007] Optionally, the connector includes a pin, and the connection position includes a hinge hole that mates with the pin.

[0008] Optionally, the connector further includes a mounting base fixedly mounted on the second pull rod, and the pin is slidably mounted on the mounting base, so that the pin can be hinged or disengaged from the hinge hole by sliding the pin.

[0009] Optionally, the connector further includes a drive component fixedly mounted on the second pull rod, the drive component being connected to the pin and used to drive the pin to slide.

[0010] Optionally, the pin has a rack portion, and the output end of the drive member is connected to a reduction assembly. The reduction assembly includes an output gear that cooperates with the rack portion. The drive member drives the reduction assembly to rotate, causing the output gear to push the pin to slide.

[0011] Optionally, the reduction assembly further includes an input gear, a first transmission gear, and a second transmission gear. The input gear is fixedly connected to the drive component. The second transmission gear is coaxial with the input gear and has a mounting slot on its side facing the output gear. The input gear extends into the mounting slot, and the inner wall of the mounting slot is provided with inner ring teeth. The first transmission gear is rotatably mounted on the second transmission gear and simultaneously meshes with the input gear and the inner ring teeth. The output gear is coaxially fixedly connected to the second transmission gear.

[0012] Optionally, the deceleration assembly further includes a bevel gear arranged perpendicularly to the second transmission gear, the outer wall of the second transmission gear having an outer ring tooth that mates with the bevel gear; a rotating handle is connected to the side of the bevel gear away from the second transmission gear.

[0013] Optionally, the first pull rod has a first plate and a second plate arranged in parallel, and the first plate and the second plate are respectively provided with the hinge hole; there are two pins, and the two pins are respectively used to cooperate with the hinge hole on the first plate and the second plate; the rack portion of the two pins respectively meshes with the two opposite sides of the output gear, thereby realizing that the output gear drives the two pins to extend or retract at the same time.

[0014] Optionally, the first plate and the second plate are respectively provided with limiting grooves that cooperate with the pin on their opposite sides. The limiting grooves extend along the length direction of the first pull rod and guide the relative sliding of the first pull rod and the second pull rod through the limiting grooves.

[0015] Optionally, it also includes a movable ramp, one end of which is hinged to the movable deck; and a plurality of the aforementioned anti-fall-off tie rods are provided between the movable ramp and the movable deck.

[0016] The beneficial effects of this application are as follows: This invention provides a movable deck structure that prevents detachment. An anti-detachment tie rod is set between the upper fixed deck and the lower movable deck. The anti-detachment tie rod does not need to rely on the ship's pillars. It can be arranged at multiple points around the perimeter of the movable deck and at any position in the middle of the movable deck. Therefore, it can provide multiple points of support for the movable deck, so that the movable deck is subjected to uniform force and avoids problems such as tilting and falling of the movable deck.

[0017] The anti-detachment tie rod in this solution is adjustable in length, allowing for adjustments to the length of the tie rod based on the height of the loading vehicles. This enables the adjustment of the working position of the movable deck to accommodate various loading needs. Furthermore, the anti-detachment tie rod is foldable. When the movable deck is not in use, it can be raised to a position close to the upper fixed deck, and the tie rod can be folded after raising, avoiding any obstruction to the raising of the movable deck. Attached Figure Description

[0018] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the anti-detachment movable deck structure described in the embodiments of this application in its working position.

[0020] Figure 2 This is a schematic diagram of the anti-detachment movable deck structure described in the embodiment of this application in the retracted position.

[0021] Figure 3 This is a schematic diagram of the anti-detachment tie rod described in the embodiment of this application;

[0022] Figure 4 for Figure 3 Enlarged view of region A in the middle;

[0023] Figure 5 This is a schematic diagram of the connector structure described in the embodiments of this application;

[0024] Figure 6 This is an exploded view of the connector described in an embodiment of this application;

[0025] Figure 7 This is a schematic diagram of the structure of the deceleration assembly and the pin shaft as described in the embodiment of this application;

[0026] Figure 8 for Figure 7 An exploded view of the structure shown.

[0027] In the picture:

[0028] 10. Anti-fall-off tie rod; 20. Fixed deck; 30. Movable deck; 40. Movable ramp; 1. First tie rod; 11. Hinge hole; 12. Limiting groove; 13. First strip plate; 14. Second strip plate; 2. Second tie rod; 21. Profile groove; 3. Connector; 31. Pin shaft; 311. Rack part; 32. Drive component; 33. Reduction assembly; 331. Input gear; 332. First transmission gear; 333. Second transmission gear; 3331. Mounting slot; 3332. Inner ring gear; 3333. Outer ring gear; 334. Output gear; 335. Bevel gear; 34. Mounting base; 341. Clearance hole; 342. Mounting hole; 35. Rotating handle. Detailed Implementation

[0029] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this application are further described in detail below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] To achieve the raising and lowering of the movable deck, a hydraulic lifting device is typically installed between the upper and lower fixed decks. The movable deck is connected to the hydraulic lifting device, which drives its raising and lowering. Simultaneously, lateral supports are fixedly installed on the ship's pillars corresponding to the working position of the movable deck. After the movable deck is lowered to the working position, it abuts against these lateral supports. The support from these lateral supports allows the movable deck to remain stable even after the hydraulic system's power is removed. However, the fixed installation of the lateral supports means that the movable deck can only be lowered to a fixed height, and its working height cannot be adjusted according to the height of parked vehicles. Furthermore, the lateral supports can only be installed on the ship's pillars. If it cannot be guaranteed that there are pillars on all four sides of the movable deck to provide support, uneven stress can easily occur, leading to problems such as the movable deck tilting or even falling.

[0033] To solve the above technical problems, such as Figure 1-8 As shown, this embodiment provides a movable deck structure for preventing detachment, including a fixed deck 20, a movable deck 30, and a plurality of anti-detachment tie rods 10. The movable deck 30 is located below the fixed deck 20. The anti-detachment tie rods 10 include a first tie rod 1, a second tie rod 2, and a connector 3. One end of the first tie rod 1 is hinged to the fixed deck 20, and the other end is hinged to the second tie rod 2 through the connector 3. The other end of the second tie rod 2 is hinged to the movable deck 30, so that the first tie rod 1 and the second tie rod 2 can be rotated and folded relative to each other. The first tie rod 1 and / or the second tie rod 2 are provided with a plurality of connection positions that cooperate with the connector 3 at intervals along their own length direction. The connector 3 is hinged to the connection positions at different positions, so that the anti-detachment tie rods 10 have different lengths.

[0034] Based on the above-mentioned anti-detachment movable deck structure, an anti-detachment tie rod 10 is installed between the upper fixed deck 20 and the lower movable deck 30. The anti-detachment tie rod 10 does not need to rely on the hull's pillars for installation. It can be arranged at multiple points around the perimeter of the movable deck 30 and at any position in the middle of the movable deck 30. Therefore, it can provide multiple points of support for the movable deck 30, so that the movable deck 30 is subjected to uniform force and avoids problems such as tilting or falling of the movable deck 30.

[0035] The length of the anti-fall-off pull rod 10 in this solution is adjustable, combined with... Figure 1 During use, the length of the anti-slip lever 10 can be adjusted arbitrarily according to the height of the loading vehicles, thereby adjusting the working position of the movable deck 30 to accommodate more loading needs. Furthermore, the anti-slip lever 10 in this solution is foldable, combined with… Figure 2 When the movable deck 30 is not needed, it can be raised to a position close to the upper fixed deck 20. After being raised, the anti-falling tie rod 10 is folded to avoid obstructing the rise of the movable deck 30.

[0036] In one embodiment, the connector 3 includes a pin 31, and the connection position includes a hinge hole 11 that mates with the pin 31.

[0037] The hinge structure, employing a hole-shaft connection, offers advantages such as convenient adjustment and reliable connection. Specifically, the pin 31 can move axially relative to the hinge hole 11. When adjusting the length of the anti-drop tie rod 10, the pin 31 is moved to disengage from the hinge hole 11. At this time, the first tie rod 1 and the second tie rod 2 can move relative to each other, thus allowing the hydraulic device to directly drive the raising and lowering of the movable deck 30. After the movable deck 30 moves to the predetermined position, the pin 31 is moved again to insert into the hinge hole 11, locking the first tie rod 1 and the second tie rod 2, preventing the movable deck 30 from descending further. With the pin 31 inserted into the hinge hole 11, when the hydraulic device drives the movable deck 30 to rise, the first tie rod 1 and the second tie rod 2 will rotate relative to each other around the pin 31, entering a folded state.

[0038] In one embodiment, the connector 3 further includes a mounting base 34 fixedly mounted on the second pull rod 2, and the pin 31 is slidably mounted on the mounting base 34. The pin 31 is hinged or disengaged from the hinge hole 11 by sliding the pin 31.

[0039] Specifically, connector 3 is fixedly installed on the second pull rod 2, and hinge hole 11 is correspondingly set on the first pull rod 1. Based on the support of mounting base 34, the pin 31 can slide stably.

[0040] In one embodiment, the connector 3 further includes a drive member 32 fixedly mounted on the second pull rod 2, the drive member 32 being connected to the pin 31 and used to drive the pin 31 to slide.

[0041] The drive component 32 controls the sliding of the pin 31, enabling remote automated control without manual movement of the pin 31. This allows for remote control of the anti-detachment tie rod 10 length adjustment, accelerating the lifting and lowering efficiency of the movable deck 30 and reducing manpower input.

[0042] Specifically, based on the transmission relationship between the drive component 32 and the pin 31, a suitable drive component 32 is selected. For example, the drive component 32 can be an electrical control such as a motor that outputs rotary motion or an electromagnet that outputs linear motion. To control the drive component 32, each drive component 32 can be equipped with a separate control board and battery. The control board has a wireless transceiver module, and the drive component 32 is connected to the control board. Alternatively, each drive component 32 can be connected to the control center via signal lines and power lines. When it is necessary to adjust the length of the anti-drop lever 10, the drive component 32 is first remotely controlled to operate, causing the pin 31 to disengage from the hinge hole 11. When it is necessary to lock the anti-drop lever 10, the drive component 32 is remotely controlled to operate, causing the pin 31 to engage with the hinge hole 11.

[0043] In one embodiment, the pin 31 has a rack portion 311, and the output end of the drive member 32 is connected to a reduction assembly 33. The reduction assembly 33 includes an output gear 334 that cooperates with the rack portion 311. The drive member 32 drives the reduction assembly 33 to rotate, causing the output gear 334 to push the pin 31 to slide.

[0044] Specifically, the drive component 32 is a motor. Based on the cooperation between the output gear 334 and the rack 311, the rotational motion of the motor can be converted into the axial movement of the pin 31. This transmission structure has the advantages of good stability and easy control.

[0045] Regarding the sliding installation of pin 31, please refer to... Figure 6 The mounting base 34 is box-shaped with an internal cavity. A clearance hole 341 is provided on the side of the mounting base 34 to mate with the pin 31. The rack portion 311 of the pin 31 is located inside the mounting base 34 and meshes with the output gear 334. The body of the pin 31 extends through the clearance hole 341 to the outside of the mounting base 34. Based on the support provided by the clearance hole 341, the pin 31 can be slidably mounted. Furthermore, combined with… Figure 4The second tie rod 2 is a C-shaped profile with a profile groove 21 formed on one side. The mounting base 34 is fixedly installed in the profile groove 21. The side wall of the second tie rod 2 is provided with a through hole corresponding to the clearance hole 341. The pin 31 extends through the through hole to the outside of the second tie rod 2 to be hinged with the first tie rod 1. At this time, the second tie rod 2 can also support the pin 31, improving the load-bearing capacity of the anti-drop tie rod 10.

[0046] In one embodiment, reference is made to Figure 6 The deceleration assembly 33 further includes an input gear 331, a first transmission gear 332, and a second transmission gear 333. The input gear 331 is fixedly connected to the drive member 32. The second transmission gear 333 is coaxial with the input gear 331 and has a mounting slot 3331 on its side facing the output gear 334. The input gear 331 extends into the mounting slot 3331. The inner wall of the mounting slot 3331 is provided with an inner ring tooth 3332. The first transmission gear 332 is rotatably mounted on the second transmission gear 333 and simultaneously meshes with the input gear 331 and the inner ring tooth 3332. The output gear 334 is coaxially fixedly connected to the second transmission gear 333.

[0047] Specifically, based on the fixed connection between the output gear 334 and the second transmission gear 333, the rotational speed of the output gear 334 is the same as that of the second transmission gear 333; based on the intermediate transmission of the first transmission gear 332, the transmission ratio between the input gear 331 and the inner ring gear 3332 is the ratio of their number of teeth. Obviously, since the input gear 331 is located inside the inner ring gear 3332 and there is a certain gap between them, the number of teeth of the inner ring gear 3332 must be greater than the number of teeth of the input gear 331. Therefore, the transmission from the input gear 331 to the second transmission gear 333 is a speed reduction transmission.

[0048] The transmission structure of this solution adopts a planetary gear transmission structure, which has the advantages of reliable structure and stable transmission.

[0049] In one embodiment, the deceleration assembly 33 further includes a bevel gear 335 arranged perpendicularly to the second transmission gear 333, and the outer wall of the second transmission gear 333 is provided with an outer ring tooth 3333 that cooperates with the bevel gear 335; a rotating handle 35 is connected to the side of the bevel gear 335 away from the second transmission gear 333.

[0050] Specifically, the outer ring gear 3333 is also a bevel gear, enabling vertical transmission between the bevel gear 335 and the second transmission gear 333. This design, combined with the second transmission gear 333, includes a bevel gear 335 connected to the rotating handle 35. When the drive unit 32 malfunctions or fails, the rotating handle 35 can be manually twisted to control the sliding of the pin 31, addressing adjustment needs in emergency situations. The bevel gear 335 and the second transmission gear 333 are perpendicular, meaning their axes are perpendicular. Therefore, the bevel gear 335 and the input gear 331 can extend from different directions of the mounting base 34, facilitating the arrangement of the rotating handle 35 and the drive unit 32.

[0051] Reference Figure 6 The mounting base 34 has a mounting hole 342 on the side near the drive component 32, and the second transmission gear 333 is rotatably mounted in the mounting hole 342.

[0052] In one embodiment, reference is made to Figure 4 The first pull rod 1 has a first plate 13 and a second plate 14 arranged in parallel, and the first plate 13 and the second plate 14 are respectively provided with the hinge hole 11; there are two pins 31, and the two pins 31 are respectively used to cooperate with the hinge hole 11 on the first plate 13 and the second plate 14; the rack portion 311 of the two pins 31 respectively meshes with the two opposite sides of the output gear 334, thereby realizing that the output gear 334 drives the two pins 31 to extend or retract at the same time.

[0053] The connector 3 is provided with a first plate 13 and a second plate 14 that are symmetrical on both sides. Two pins 31 extend from the two opposite sides to be hinged to the first plate 13 and the second plate 14, which can make the force on both sides of the connector 3 balanced and ensure the reliability of the connector 3.

[0054] In one embodiment, the first strip 13 and the second strip 14 are respectively provided with limiting grooves 12 that cooperate with the pin 31 on their opposite sides. The limiting grooves 12 extend along the length direction of the first pull rod 1 and guide the relative sliding of the first pull rod 1 and the second pull rod 2 through the limiting grooves 12.

[0055] Specifically, when the length of the anti-detachment tie rod 10 needs to be adjusted, the control pin 31 retracts and disengages from the hinge hole 11, while simultaneously placing the pin 31 within the limiting slide groove 12 to maintain a sliding connection with the limiting slide groove 12. This prevents the first tie rod 1 and the second tie rod 2 from completely separating. When the movable deck 30 is raised or lowered, the second tie rod 2 can be pushed to move linearly up and down relative to the first tie rod 1. When it moves to the predetermined position, the pin 31 aligns with the hinge hole 11, and the pin 31 is directly extended to lock the first tie rod 1 and the second tie rod 2.

[0056] In one embodiment, the system further includes a movable ramp 40, one end of which is hinged to the movable deck 30; and a plurality of the anti-fall-off tie rods 10 are provided between the movable ramp 40 and the movable deck 30.

[0057] Specifically, the movable ramp 40 can be used to transport vehicles onto the movable deck 30. The movable ramp 40 and the movable deck 30 are connected by an anti-fall-off tie rod 10, which can improve the load-bearing capacity of the movable ramp 40 and avoid the risk of breakage at the connection between the movable ramp 40 and the movable deck 30.

[0058] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and other orientations or positional relationships are used only for ease of description and simplification of operation, 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, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used merely for descriptive distinction and have no special meaning.

[0059] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0060] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0061] The technical principles of this application have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this application and should not be construed as limiting the scope of protection of this application in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this application without inventive effort, and these embodiments will all fall within the scope of protection of this application.

Claims

1. A movable deck structure designed to prevent detachment, characterized in that, The system includes a fixed deck (20), a movable deck (30), and several anti-detachment tie rods (10). The movable deck (30) is located below the fixed deck (20). Each anti-detachment tie rod (10) includes a first tie rod (1), a second tie rod (2), and a connector (3). One end of the first tie rod (1) is hinged to the fixed deck (20), and the other end is hinged to the second tie rod (2) through the connector (3). The other end of the second tie rod (2) is hinged to the movable deck (30), allowing the first tie rod (1) and the second tie rod (2) to rotate and fold relative to each other. The first tie rod (1) and / or the second tie rod (2) are provided with several connection positions that mate with the connector (3) at intervals along their own length. The connector (3) is hinged to the connection positions at different locations, allowing the anti-detachment tie rod (10) to have different lengths. The connector (3) includes a pin (31), a mounting base (34) and a drive member (32) fixedly mounted on the second pull rod (2). The pin (31) is slidably mounted on the mounting base (34). The connection position includes a hinge hole (11) that mates with the pin (31). The pin (31) has a rack portion (311). The output end of the drive member (32) is connected to a reduction assembly (33). The reduction assembly (33) includes an output gear (334) that mates with the rack portion (311). The drive member (32) drives the reduction assembly (33) to rotate, causing the output gear (334) to push the pin (31) to slide, so that the pin (31) is hinged or disengaged from the hinge hole (11). The reduction assembly (33) further includes an input gear (331), a first transmission gear (332), and a second transmission gear (333). The input gear (331) is fixedly connected to the drive member (32). The second transmission gear (333) is coaxial with the input gear (331) and has a mounting slot (3331) on the side facing the output gear (334). The input gear (331) extends into the mounting slot (3331). The inner wall of the mounting slot (3331) is provided with an inner ring tooth (3332). The first transmission gear (332) is rotatably mounted on the second transmission gear (333) and simultaneously meshes with the input gear (331) and the inner ring tooth (3332). The output gear (334) is coaxially fixedly connected to the second transmission gear (333).

2. The anti-detachment movable deck structure according to claim 1, characterized in that, The deceleration assembly (33) further includes a bevel gear (335) arranged perpendicularly to the second transmission gear (333). The outer wall of the second transmission gear (333) is provided with an outer ring tooth (3333) that mates with the bevel gear (335). A rotating handle (35) is connected to the side of the bevel gear (335) away from the second transmission gear (333).

3. The anti-detachment movable deck structure according to claim 1, characterized in that, The first pull rod (1) has a first plate (13) and a second plate (14) arranged in parallel. The first plate (13) and the second plate (14) are respectively provided with the hinge hole (11). There are two pins (31), and the two pins (31) are respectively used to cooperate with the hinge hole (11) on the first plate (13) and the second plate (14). The rack portion (311) of the two pins (31) respectively meshes with the two opposite sides of the output gear (334), so that the output gear (334) drives the two pins (31) to extend or retract at the same time.

4. The anti-detachment movable deck structure according to claim 3, characterized in that, The first plate (13) and the second plate (14) are respectively provided with limiting grooves (12) that cooperate with the pin (31) on their opposite sides. The limiting grooves (12) extend along the length direction of the first pull rod (1) and guide the relative sliding of the first pull rod (1) and the second pull rod (2) through the limiting grooves (12).

5. The anti-detachment movable deck structure according to claim 1, characterized in that, It also includes a movable ramp (40), one end of which is hinged to the movable deck (30); and a plurality of anti-falling tie rods (10) are provided between the movable ramp (40) and the movable deck (30).

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