A carriage guard

Abstract

This invention discloses a vehicle compartment protection device, including a vehicle compartment body, a roller structure rotatably connected to the top of the rear door, and a flexible roller shutter structure connected thereto. The roller structure can rotate to roll up or lay down the flexible roller shutter structure to open or close the rear door of the vehicle compartment. It also includes a drive assembly for transmitting the roller structure, a stop system for detecting the rolling or laying position information, and a main control module electrically connected to both. This invention controls the drive assembly by receiving signals from the stop system through the main control module, realizing the automatic opening and closing of the rear door and its stopping at the designated position. When rolled up, the flexible roller shutter structure does not occupy any space for entry and exit through the rear door, ensuring rapid loading and unloading of materials and personnel; when laid down, it completely encloses the rear door of the vehicle compartment from top to bottom, effectively preventing materials from slipping or being lost during transportation. This invention combines the advantages of fully enclosed protection with unobstructed and rapid loading and unloading, has a reliable structure, and is particularly suitable for transport vehicles such as military trucks that require rapid response and material protection.

Description

Technical Field

[0001] This invention relates to the field of transport vehicle technology, and specifically to a vehicle compartment protection device. Background Technology

[0002] In the field of military transport vehicles, truck bodies are crucial platforms for carrying military supplies, equipment, and personnel. To meet the demands of rapid deployment and efficient loading and unloading, the cargo box structure of military trucks is typically designed for easy entry, exit, and operation. Currently, conventional military truck bodies in this field often only have a low door structure or tailgate at the rear, while the higher rear of the cargo box lacks effective covering or closing structures. For example, common military trucks often have only a tailgate or tailgate with a height of about one-third to one-half of the cargo box height, leaving most of the upper part of the cargo box open.

[0003] The main consideration in this design is that the loading and unloading process of military supplies and personnel requires extremely high response speed and ease of operation. If the rear door of the carriage is completely closed, such as with a conventional full-height double door or sliding door, although the closure of the carriage can be improved, it will significantly increase the number of steps and time required for loading and unloading, and may even hinder the rapid loading and unloading of personnel and the rapid transfer of supplies in emergencies, which is not conducive to meeting the needs of rapid response missions. Therefore, existing technologies generally adopt a lower door structure, sacrificing some closure in exchange for loading and unloading efficiency.

[0004] However, the existing structure described above has significant technical drawbacks in practical applications. Because there is no obstruction at the top of the rear door of the carriage, military supplies or equipment loaded inside are prone to displacement, rollover, or even slipping or being lost from the open area at the rear of the carriage during transport, especially when the vehicle is traveling on bumpy roads, climbing slopes, braking, or performing tactical maneuvers. This poses a risk of loss of military supplies or equipment during transport, resulting not only in economic losses but also potentially affecting the mission's sustainability and operational effectiveness.

[0005] Therefore, how to effectively prevent the loss of materials or equipment due to the high opening at the rear of the truck bed while ensuring the rapid loading and unloading of military truck beds and the rapid response capability of personnel has become an urgent technical problem to be solved in this field. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a vehicle compartment protection device.

[0007] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: This invention provides a vehicle compartment protection device, including a vehicle compartment body, and further comprising: The roller structure rotatably connected to the main body of the carriage, and the flexible roller blind structure connected thereto, wherein the roller structure can rotate to rewind or lay out the flexible roller blind structure to open or close the rear door of the carriage; The system includes a drive assembly for rotating the roller structure, a stop assembly for receiving information about the winding or laying position of the flexible roller blind structure, and a main control module electrically connected to the drive assembly and the stop assembly, wherein the main control module receives information from the stop assembly to control the drive assembly to drive the roller structure.

[0008] The beneficial effects of the present invention are as follows: by rotatably setting a roller structure and a flexible roller blind structure at the top of the rear door of the main body of the carriage, and further including a drive component and a stop component structure electrically connected to the main control module respectively, the main control module obtains information on the completion of the winding or laying state of the flexible roller blind structure through the stop component, controls the drive component to drive the roller structure to rotate, and realizes the switching of the winding or laying state of the flexible roller blind structure.

[0009] Firstly, a retractable flexible roller shutter structure is installed at the top of the rear door of the vehicle, which, together with a drive component, enables automatic opening and closing. When loading and unloading goods or getting on and off personnel, the roller shutter structure is completely rolled up at the top, without occupying the rear door access space, maintaining or even surpassing the barrier-free and rapid passage capability of existing lower doors. During transportation, the roller shutter structure can be completely laid down to the bottom, sealing the entire rear door opening from top to bottom, thus achieving a unity of "fully enclosed protection" and "barrier-free and rapid loading and unloading," fundamentally avoiding the risk of goods slipping or being lost from high open areas.

[0010] Secondly, once fully deployed, the flexible roller shutter forms a closed containment space with the main body of the carriage, completely blocking the high area of ​​the rear door. Regardless of the volume or stacking height of the supplies, they cannot be removed from the rear of the carriage, significantly reducing the probability of supplies being lost under complex transportation conditions (bumps, climbing, braking, tactical maneuvers), and effectively ensuring the integrity of military supplies and mission continuity.

[0011] Finally, the main control module, drive component, and stop component form a closed-loop control system: the stop component accurately determines the fully rolled-up or fully laid-out state by detecting the number of rotations of the roller or limit switch signals, and the main control module stops the drive in time to avoid motor idling or mechanical damage. Simultaneously, remote or pre-programmed control based on electrical connections allows the roller shutter to be rolled up in advance before the vehicle arrives, achieving a "zero-wait" response for loading and unloading upon parking; after loading and unloading, it can also be remotely and immediately closed without personnel needing to disembark, making it particularly suitable for tactical scenarios involving rapid evacuation or high-threat environments. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the vertical guide groove, the horizontal rotating shaft structure, and the second limiting block tube in this invention; Figure 3 For the present invention Figure 1 Enlarged view of part A in the image; Figure 4 For the present invention Figure 1 A magnified view of part B in the image; Figure 5 For the present invention Figure 1 A magnified view of a portion of C in the image; Figure 6 For the present invention Figure 1 A magnified view of a portion of the image; Figure 7 For the present invention Figure 1 A magnified view of a portion of E in the image.

[0014] The attached diagram lists the components represented by each number as follows: 10. Rear door of the carriage; 1. Main body of the carriage; 11. Side beam; 111. Vertical guide groove; 112. Elastic buffer pad; 12. Horizontal sliding shaft; 13. Separation slide; 131. Elastic element; 2. Roller structure; 21. Roller body; 211. Transmission locking hole; 22. Limiting spiral guide groove; 23. Stop impact platform; 3. Flexible roller shutter structure; 31. Chain structure; 311. Single chain piece; 312. Double chain piece; 32. Horizontal rotating shaft structure; 4. Drive assembly; 41. Drive motor; 411. Transmission locking part; 5. Stop assembly; 51. First limit switch; 511. Switch spring arm; 52. Second limit switch; 6. Main control module; 7. Manual drive structure; 71. Linkage shaft; 72. First gearbox; 73. Second gearbox; 74. Manual crank. Detailed Implementation

[0015] The following will clearly and completely describe the concept, specific structure, and technical effects of the present invention in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this invention can be combined interactively without contradicting each other.

[0016] The protective device for the cargo compartment of this invention is installed at the rear door of the cargo compartment body 1 of a military truck. Its core lies in: using a roller structure 2 to roll up or lay out a flexible roller blind structure 3, in conjunction with a drive assembly 4, a stop assembly 5, and a main control module 6, to achieve automated and controllable opening and closing of the rear door. Specifically, the roller structure 2 is rotatably connected to the top beam or side beam 11 of the rear door 10 via a bearing seat. The upper end of the flexible roller blind structure 3 is fixed to the roller structure 2. The drive assembly 4 (such as a motor) drives the roller structure 2 to rotate, thereby causing the flexible roller blind structure 3 to roll up (open the rear door) or lay down (close the rear door). The stop assembly 5 detects in real time whether the rolling or laying is in place, and the main control module 6 controls the drive assembly 4 to start and stop according to the stop signal, forming a closed-loop control.

[0017] refer to Figures 1 to 7 The present invention provides a protective device for a carriage, including a carriage body 1, a roller structure 2 rotatably connected to the carriage body 1, and a flexible roller curtain structure 3 connected thereto. The roller structure 2 can rotate to roll up or lay the flexible roller curtain structure 3 to open or close the rear door 10 of the carriage. The system includes a drive assembly 4 that drives the rotation of the roller structure 2, a stop assembly 5 that receives information about the winding or laying position of the flexible roller blind structure 3, and a main control module 6 that is electrically connected to the drive assembly 4 and the stop assembly 5 respectively. The main control module 6 is used to receive information from the stop assembly 5 and control the drive assembly 4 to drive the roller structure 2.

[0018] In this embodiment, refer to Figure 1 First, bearing seats are installed on the top of the top crossbeam or the top of the side beams 11 of the rear door 10 of the carriage. The two ends of the roller structure 2 are rotatably supported on the bearing seats. Optionally, the roller structure 2 can be a hollow steel tube or a solid shaft. The flexible roller structure 3 uses a high-strength, weather-resistant flexible material, such as rubber-coated polyester fiber cloth or a chain metal structure. Its upper edge is fixed to the outer circumference of the roller structure 2 by means of pressure strips, rivets or adhesive. The drive component 4 is a DC geared motor. Its output shaft is coaxially connected to one end of the roller structure 2 through a coupling, gear or transmission snap-fit ​​part 411. The stop component 5 includes a limit switch. The main control module 6 is a microcontroller. Optionally, the main control module 6 can be an STM32 series or an on-board PLC. Its input terminal is electrically connected to the signal output terminal of the stop component 5, and its output terminal is electrically connected to the control terminal of the drive component 4, such as a motor driver. The main control module 6 has preset control logic: when a "open" command is received, the drive motor 41 rotates forward, the roller structure 2 rolls up the flexible roller blind, and at the same time, when it is fully rolled up, the stop component 5 is triggered and a message is sent to the main control module 6 to cut off the motor power; when a "close" command is received, the drive motor 41 rotates in reverse, and the flexible roller blind is laid down under the force of gravity and the motor. When it is laid down and lowered to the lowest point, the stop component 5 is triggered and a message is sent to the main control module 6 to stop the motor.

[0019] It should be explained that when the flexible roller shutter structure 3 is fully rolled up, the rear door remains open and unobstructed, allowing for rapid loading and unloading and personnel response; when fully laid down, the entire rear door is closed from top to bottom, effectively preventing materials from slipping or being lost from heights. Simultaneously, the touch-stop system and the main control module 6 achieve automatic stopping at the designated position, avoiding motor idling or incomplete sealing, thus improving reliability and automation levels.

[0020] The beneficial effects of the present invention are as follows: by rotatably setting a roller structure 2 and a flexible roller blind structure 3 on the top of the rear door of the main body 1, and further including a drive component 4 and a stop component 5 electrically connected to the main control module 6, the main control module 6 obtains information on the completion of the winding or laying state of the flexible roller blind structure 3 through the stop component 5, controls the drive component 4 to drive the roller structure 2 to rotate, and realizes the switching of the winding or laying state of the flexible roller blind structure 3.

[0021] First, this solution adopts a flexible roller shutter structure 3, which can be completely rolled up on the roller structure 2 at the top of the carriage when not in use (when loading and unloading materials or personnel getting on and off), without occupying the entry and exit space of the rear door 10 of the carriage. Personnel and materials can directly and quickly enter and exit horizontally from the rear door without any door obstruction. This solution retains and is even better than the loading and unloading convenience and response speed of the existing lower door structure. At the same time, during transportation, the flexible roller shutter structure 3 can be laid down by the drive component 4 to completely close the entire opening of the rear door 10 of the carriage (from top to bottom), effectively preventing materials from slipping or being lost from the high opening, thus achieving full closure protection and unobstructed rapid loading and unloading.

[0022] Secondly, when the flexible roller shutter structure 3 is fully deployed under the drive component 4, it forms a closed containment space together with the main body of the carriage 1. The flexible roller shutter structure 3 extends from the top to the bottom of the carriage, completely blocking the high area of ​​the rear door, so that no matter the size or stacking height of any material, it cannot be removed from the rear of the carriage, which significantly reduces the probability of loss of materials under complex transportation conditions and ensures the integrity of military materials and mission continuity.

[0023] Finally, this solution electrically connects the drive assembly 4 and the stop assembly 5 through the main control module 6 to form a closed-loop control. Specifically, the stop assembly 5 can accurately determine whether the flexible roller blind structure 3 is in the fully open or fully closed limit position by detecting the number of rotations of the roller structure 2 (to know the fully rolled-up state) or the limit switch that contacts the lowest point of the roller blind (to know the fully laid-out state). Then, after receiving the position signal from the stop assembly 5, the main control module 6 immediately controls the drive assembly 4 to stop transmission, avoiding motor idling, excessive pulling of the roller blind, or damage to the roller mechanism, thus improving the reliability and lifespan of the system. Meanwhile, since the main control module 6, the stop component 5, and the drive component 4 are all electrically connected, this solution enables contactless, remote, or pre-programmed control. This allows the driver or command personnel to issue instructions in advance, before the vehicle arrives at the loading / unloading point or destination. The main control module 6 then controls the drive component 4 to rotate in the opposite direction, causing the flexible roller shutter structure 3 to retract in advance. This ensures that the rear door 10 of the cargo compartment is fully open when the vehicle comes to a complete stop, allowing personnel and materials to begin loading and unloading immediately with zero waiting time, further shortening the response time. Furthermore, after loading and unloading are completed, the system can immediately begin laying and closing the doors without requiring personnel to disembark and operate manually, making it particularly suitable for tactical scenarios requiring rapid evacuation or in potentially threatening environments.

[0024] In some embodiments, the main control module 6 can also receive vehicle driving status signals, such as vehicle speed, gear, and braking signals. This allows for automatic roll-up and closing when the vehicle is in a driving gear and its speed exceeds a preset value; and automatic roll-up and opening when the vehicle stops, is in reverse gear, or the loading / unloading indicator light is on. This intelligent linkage further reduces the driver's workload while ensuring protection, preventing loss of materials due to forgetting to close the roll-up.

[0025] Preferred, Reference Figure 1 and Figure 3 The scroll structure 2 includes a scroll body 21, and the carriage body includes side beams 11 located on both sides of the rear door 10 of the carriage. The scroll body 21 is rotatably connected to the top gear of the side beams 11.

[0026] In this embodiment, the vertical side beams 11 on both sides of the rear door 10 of the carriage are made of rectangular steel tubes or C-shaped steel. A bearing seat is welded or bolted to the top inner side of each side beam 11, and a rolling bearing is installed in the bearing seat. The two ends of the roller body 21 are supported in the bearing seats on both sides by bearings. To achieve gear rotation connection, a large gear can be fixed to the outer circle of one end of the roller body 21, and a small gear can be fixed to the output shaft of the drive assembly 4, and the two mesh to drive; or a gear shaft segment can be directly machined at the end of the roller body 21 to mesh with the drive gear.

[0027] It needs to be explained that by setting a bearing seat at the top of the side beam 11, the roller body 21 can rotate stably and reliably, avoiding the roller from sagging or swaying, ensuring that the flexible roller blind structure 3 always remains centered during the rolling and laying process, thereby ensuring that the rear door can be completely closed and eliminating the risk of partial opening caused by roller blind offset.

[0028] Preferred, Reference Figures 1 to 3 The side beam 11 has a vertical guide groove 111 on its inner side, which is used to guide the side end of the flexible roller blind structure 3 to rise or fall.

[0029] In this embodiment, vertical grooves are formed on the inner surfaces of the left and right side beams 11 (i.e., the side facing the interior of the carriage) as vertical guide grooves 111. The cross-sectional shape of the guide groove can be U-shaped, C-shaped, or L-shaped, and the groove width is slightly larger than the end of the transverse pivot of the flexible roller blind structure 3. The guide groove extends from the top to the bottom of the side beam 11, and a limiting block can be provided at the bottom. During installation, the guide members on the left and right sides of the flexible roller blind structure 3 are respectively embedded in the corresponding guide grooves and can slide up and down along the guide grooves.

[0030] In some embodiments, an elastic buffer pad 112 is provided on the inner wall of the vertical guide groove 111. The elastic buffer pad 112 is used to isolate the end of the horizontal pivot structure 32 on the flexible roller blind structure 3 from the inner wall of the vertical guide groove 111, thereby reducing friction on the end of the horizontal pivot structure 32.

[0031] It needs to be explained that the vertical guide groove 111 forcibly limits and guides both sides of the flexible roller shutter structure 3, preventing the roller shutter from swinging laterally or coming off under the influence of vehicle bumps or crosswinds. This ensures that the roller shutter is always laid out and rolled up smoothly in the vertical direction, thereby achieving a tight lateral seal and preventing materials from falling through the side gaps. At the same time, the guide groove improves the wind resistance and stability of the roller shutter.

[0032] The present invention provides vertical guide grooves 111 on the inner side of the side beams 11 on both sides of the rear door 10 of the carriage, thereby effectively limiting the upward or downward path of the flexible roller shutter structure 3.

[0033] Preferred, Reference Figure 1 and Figure 4 The flexible roller blind structure 3 includes a chain structure 31 connected to the roller body 21 at its upper end, and a plurality of horizontal rotating shaft structures 32 rotatably disposed on the chain structure 31. The chain structure 31 can be rolled up around the roller body 21 or unfolded and suspended below the roller body 21. The two ends of the horizontal rotating shaft structures 32 extend into the vertical guide groove 111 respectively.

[0034] In this embodiment, the flexible roller blind structure 3 includes a chain structure 31 connected to the upper end of the roller body 21, and a plurality of transverse rotating shaft structures 32 rotatably disposed on the chain structure 31; the chain structure 31 can be rolled up to form a roll around the roller body 21, and unfolded to hang below the roller body 21, and the two ends of the transverse rotating shaft structures 32 respectively extend into the vertical guide groove 111.

[0035] Specifically, this embodiment uses a metal chain roller shutter, suitable for military scenarios requiring the carrying of heavy materials or a higher level of protection. The chain structure 31 is composed of multiple long chain links connected sequentially by hinges, each chain link being a horizontally arranged metal strip or rod. At the connection of adjacent chain links, a horizontal pivot structure 32 is installed, i.e., a long shaft running through the left and right sides, with both ends extending beyond the chain links. The two ends of the horizontal pivot extend into the guide grooves of the left and right side beams 11, respectively. The uppermost chain link of the chain structure 31 is fixed to the outer circumference of the roller body 21 by a hinge seat. During winding, the roller body 21 rotates, and the chain links wind around the roller body 21 layer by layer; during laying, the chain links unfold section by section under the action of gravity, and the horizontal pivot rolls down along the guide grooves.

[0036] In other embodiments, the chain structure 31 includes a single chain piece 311 and a double chain piece 312 connected end to end. The single chain piece 311 and the double chain piece 312 are connected by a pivot structure to rotate the overlapping part, and the pivot structure has the same diameter as the transverse pivot structure 32.

[0037] It needs to be explained that the chain structure 31 is high-strength and impact-resistant, making it suitable for protecting military supplies. The cooperation between the transverse pivot and the guide rail changes sliding to rolling, reducing frictional resistance and ensuring that the roller shutter can smoothly descend into place even when it is heavy, avoiding jamming that would prevent complete closure at higher points. At the same time, the pivot structure allows the roller shutter to distribute the force to the guide rails on both sides when it is impacted by cargo, improving the reliability of protection.

[0038] The present invention can be set up by winding the roll body 21 into a roll through the chain structure 31, opening the rear door 10 of the carriage, and can also be set up by unfolding and suspending it below the roll body 21 to close the rear door 10 of the carriage. At the same time, the horizontal rotating shaft structure 32 extends into the vertical guide groove 111 to guide the rise and fall of the chain structure 31.

[0039] Preferred, Reference Figure 1 and Figure 3The roller body 21 is provided with a limiting spiral guide groove 22, and a stop impact platform 23 is provided in the groove of the limiting spiral guide groove 22; the stop component 5 includes a first limiting switch 51 slidably connected to the carriage body, the first limiting switch 51 is provided with a switch spring arm 511 extending into the limiting spiral guide groove 22, and the roller body 21 rotates and retracts the flexible roller shutter structure 3, which allows the switch spring arm 511 to slide along the limiting spiral guide groove 22 and impact the stop impact platform 23 and trigger the first limiting switch 51.

[0040] In this embodiment, the reel body 21 is provided with a limiting spiral guide groove 22, and a stop impact platform 23 is provided in the guide groove; the stop system includes a first limit switch 51 slidably connected to the carriage body, and the first limit switch 51 is provided with a switch spring arm 511 extending into the limiting spiral guide groove 22; when the reel body 21 rotates and rewinds, the switch spring arm 511 slides along the spiral guide groove and strikes the stop impact platform 23 to trigger the first limit switch 51.

[0041] Specifically, a spiral guide groove is machined on the outer surface of one end of the roller body 21, with the groove depth and width adapted to the head of the switch spring arm 511. A protruding stop impact platform 23 is provided at the end of the guide groove (corresponding to the position where the roller blind is fully rolled up). The first limit switch 51 is mounted on a sliding seat, which slides in cooperation with a transverse sliding shaft 12 on the carriage body 1 parallel to the roller axis. The head of the switch spring arm 511 extends into the limiting spiral guide groove 22. When the roller body 21 rotates and rolls up in the forward direction, the groove wall of the spiral guide groove pushes the switch spring arm 511, causing the entire first limit switch 51 to move laterally along the axis. When the roller blind is fully rolled up, the spring arm hits the stop impact platform 23, triggering the first limit switch 51 to output a signal. After receiving the signal, the main control module 6 cuts off the power to the drive assembly 4.

[0042] It should be explained that this mechanical touch-stop method does not require electronic sensors such as rotary encoders, is vibration-resistant, and can withstand harsh environments (mud, water, sand), making it particularly suitable for military trucks. It can accurately sense the fully retracted position, avoiding motor overload and excessive tension of the roller shutter, while ensuring that the roller structure 2 does not occupy the rear door access space after retraction, maintaining an unobstructed state for quick loading and unloading.

[0043] This invention provides a limiting spiral guide groove 22 on the reel body 21 and a first limiting switch 51 slidably connected to the carriage body. When the reel body 21 rotates and retracts the chain structure 31, the groove wall of the limiting spiral guide groove 22 applies a pushing force to the switch spring arm 511. Simultaneously, combined with the slidable connection between the first limiting switch 51 and the carriage body, the switch spring arm 511 can slide along the limiting spiral guide groove 22. In other words, when the reel body 21 rotates, the switch spring arm 511 and the first limiting switch 51 slide along the reel body. The axis of body 21 moves laterally, and when the switch spring arm 511 slides to the position of the stop impact platform 23, the roller body 21 just completes the winding of the chain structure 31. Then, in combination with the switch spring arm 511 and the stop impact platform 23, the switch spring arm 511 triggers the first limit switch 51. The main control module 6 then receives the information that the first limit switch 51 has been triggered through the electrical connection structure, cuts off the mode of the drive component 4 driving the roller body 21 to rotate, thereby completing the winding of the flexible roller curtain structure 3, and thus realizing the fully open state of the rear door 10 of the carriage.

[0044] Preferred, Reference Figure 1 and Figure 3 The carriage body 1 is provided with a transverse sliding shaft 12 parallel to the axis of the scroll body 21, and the first limit switch 51 is slidably disposed on the transverse sliding shaft 12.

[0045] In this embodiment, the carriage body 1 is provided with a transverse sliding shaft 12 parallel to the axis of the reel body 21, and the first limit switch 51 is slidably mounted on the transverse sliding shaft 12. Specifically, a round steel bar or linear guide rail is fixed below or to the side of one end of the reel body 21 as the transverse sliding shaft 12, and its axis is parallel to the axis of the reel body 21. A linear bearing or wear-resistant bushing is installed on the sliding seat of the first limit switch 51 and is sleeved on the transverse sliding shaft 12. The sliding seat is fixedly connected to the switch spring arm 511. When the reel body 21 rotates, the spring arm is pushed by the spiral guide groove, and the sliding seat moves smoothly along the transverse sliding shaft 12.

[0046] It should be explained that the transverse sliding shaft 12 ensures the straightness and stability of the first limit switch 51 during movement, preventing false triggering or failure of the positioning detection due to sliding jamming. This ensures the reliability of the winding positioning signal, thereby guaranteeing that the rear door can open accurately and completely, without affecting the rapid entry and exit of materials and personnel.

[0047] The present invention improves the smoothness of the sliding of the first limit switch 51 when the scroll body 21 drives the switch spring arm 511 to slide by means of the transverse sliding shaft 12.

[0048] Preferred, Reference Figure 1 , Figure 2 and Figure 5The stop component 5 also includes a second limit switch 52 electrically connected to the main control module 6. The second limit switch 52 is disposed at the bottom of the vertical guide groove 111, and the horizontal rotating shaft structure 32 at the lowest point of the chain structure 31 can abut against the trigger end of the second limit switch 52.

[0049] In this embodiment, the stop system also includes a second limit switch 52 electrically connected to the main control module 6. The second limit switch 52 is located at the bottom of the guide groove structure, and the lowest transverse rotating shaft structure 32 on the chain structure 31 can abut against the trigger end of the second limit switch 52. Specifically, one second limit switch 52 is installed at the bottom of the guide groove structure of the left and right side beams 11 (near the carriage floor), or only on one side. The trigger end of the switch extends into the guide groove. When the roller body 21 reverses to lay the flexible roller blind, the chain structure 31 descends under gravity, and the lowest transverse rotating shaft structure 32 falls along the guide groove to the bottom, its end touching and pressing down the trigger end of the second limit switch 52. The second limit switch 52 sends a position signal to the main control module 6, and the main control module 6 stops driving the motor 41.

[0050] It needs to be explained that the second limit switch 52 ensures the accurate termination of the laying action, allowing the lowest point of the flexible roller shutter structure 3 to reach the height of the carriage floor, thereby completely sealing the entire opening of the rear door from top to bottom. This eliminates the problem of material loss caused by the rear door 10 being open at a high position; therefore, once the lowest point touches the floor, materials of any height cannot slide out from the rear. Furthermore, this solution is simple in structure and highly reliable.

[0051] The present invention provides a second limit switch 52 in the vertical guide groove 111. When the roller body 21 rotates and the chain structure 31 unfolds and descends along the guide groove under the action of gravity, the second limit switch 52 is triggered when the horizontal rotating shaft at the lowest point of the chain structure 31 abuts under the action of gravity. The main control module 6 then receives the information that the second limit switch 52 has been triggered through the electrical connection structure, cuts off the mode of the drive component 4 driving the roller body 21 to rotate, thereby completing the unfolding of the flexible roller curtain structure 3 and realizing the complete closing state of the rear door 10 of the carriage.

[0052] Preferred, Reference Figure 1 , Figure 6 and Figure 7 It also includes a manual drive structure 7, which comprises a linkage shaft 71, a first gearbox 72, a second gearbox 73, and a manual crank 74. The other end of the reel body 21 is horizontally connected to the first gearbox 72, and the upper and lower ends of the linkage shaft 71 are vertically connected to the first gearbox 72 and the second gearbox 73, respectively. The second gearbox 73 is horizontally connected to the manual crank 74.

[0053] In this embodiment, a manual drive structure 7 is also included, comprising a linkage shaft 71, a first gearbox 72, a second gearbox 73, and a manual crank 74. One end of the reel body 21 is horizontally connected to the first gearbox 72, and the upper and lower ends of the linkage shaft 71 are vertically connected to the first gearbox 72 and the second gearbox 73, respectively. The second gearbox 73 is horizontally connected to the manual crank 74. Specifically, in the event of no power supply or motor failure, it can be operated manually. The first gearbox 72 (such as a right-angle gearbox or a bevel gearbox) is fixed to the top of the carriage, with its output shaft horizontally positioned and its input shaft vertically downward. The end of the reel body 21 is connected to the first gearbox 72 via a coupling. The second gearbox 73 is fixed below the side wall of the carriage (for easy operation), with its input shaft extending horizontally outward to accommodate a hand crank; its output shaft is vertically upward. The linkage shaft 71 is a long splined shaft or a universal joint shaft, with its upper end connected to the input shaft of the first gearbox 72 and its lower end connected to the output shaft of the second gearbox 73. During operation, insert the hand crank into the input shaft of the second gearbox 73, crank the crank, and the power is transmitted to the reel body 21 through the second gearbox 73, the linkage shaft 71, and the first gearbox 72, causing it to rotate.

[0054] It should be explained that the manual drive structure 7 serves as a redundant backup for the electric drive, ensuring that the flexible roller shutter structure 3 can still be manually rolled up or deployed in extreme situations such as field operations, electromagnetic interference, or power failure, maintaining the opening or closing function of the rear door. This meets the reliability requirements of military equipment, preventing the loss of large quantities of supplies due to the inability to close the rear door or hindering emergency loading and unloading due to the inability to open it.

[0055] The present invention, through the structural design of the manual drive structure 7, enables the rotation of the manual crank 74 to sequentially drive the second gearbox 73, the linkage shaft 71, and the first gearbox 72, causing the roller body 21 to rotate, thereby realizing the manual winding and unfolding of the flexible roller blind structure 3, and thus the manual opening or closing of the rear door 10 of the carriage.

[0056] Preferred, Reference Figure 1 and Figure 3 The scroll body 21 has a transmission snap hole 211 at one end; the drive assembly 4 includes a drive motor 41, and the output shaft of the drive motor 41 has a transmission snap part 411 that cooperates with the transmission snap hole 211.

[0057] In this embodiment, a transmission engagement hole 211 is provided at one end of the scroll body 21; the drive assembly 4 includes a drive motor 41, and the output shaft of the drive motor 41 is provided with a transmission engagement part 411 that cooperates with the transmission engagement hole 211. Specifically, a hexagonal, square, or splined blind hole is machined at the center of one end of the scroll body 21 as the transmission engagement hole 211. The output shaft end of the drive motor 41 (such as a DC motor) is machined into a corresponding hexagonal, square, or splined shaft as the transmission engagement part 411. The motor moves closer to or away from the scroll body 21 via a movable mounting base, allowing the engagement part to be inserted into the engagement hole to achieve transmission, or pulled out to achieve separation. A small gap is left between the engagement part and the engagement hole to facilitate insertion and removal.

[0058] It should be explained that the detachable snap-fit ​​structure allows the drive motor 41 to quickly engage or disengage from the roller body 21. When manual operation is required, the snap-fit ​​can be pulled out, preventing the motor rotor from becoming a load for manual rotation and greatly reducing the manual operating force. At the same time, this structure simplifies motor installation and facilitates maintenance and replacement. This connection ensures reliable opening and closing of the roller shutter under any working conditions, thereby maintaining protection of materials or rapid response to loading and unloading.

[0059] The drive motor 41 and the scroll body 21 of the present invention are connected by a detachable snap-fit ​​structure, which can not only ensure that the drive component 4 drives the scroll structure 2 to achieve self-rotation, but also improve the assembly and disassembly efficiency of the two through the snap-fit ​​structure.

[0060] Preferred, Reference Figure 3 The main body 1 of the carriage is also provided with a separation slide 13, the drive motor 41 is provided on the separation slide 13, and an elastic element 131 is provided between the separation slide 13 and the main body 1 of the carriage. The elastic element 131 pushes the separation slide 13 to move toward the roller body 21 so that the transmission locking part 411 is installed in the transmission locking hole 211.

[0061] In this embodiment, the carriage body 1 is also provided with a separation slide 13, and a drive motor 41 is mounted on the separation slide 13. An elastic element 131 is provided between the separation slide 13 and the carriage body 1. The elastic element 131 pushes the separation slide 13 toward the reel body 21 so that the transmission locking part 411 is installed in the transmission locking hole 211. Specifically, a pair of parallel slide rails or slide grooves are fixed on the top of the carriage body 1, and the separation slide 13 is slidably mounted on the slide rails. The drive motor 41 is fixed on the separation slide 13. The elastic element 131 is a compression spring or a gas spring, one end of which rests on the fixed bracket of the carriage body 1, and the other end pushes the separation slide 13 toward the reel body 21 so that the locking part of the motor output shaft automatically inserts into the locking hole of the reel body 21. When separation is required, the separation slide 13 is manually pulled to move in the opposite direction against the elastic force, so that the locking part is disengaged and locked in the separation position with a pin or latch.

[0062] It should be explained that the elastic element 131 provides automatic engagement force and a stable transmission connection, preventing accidental disengagement of the locking part due to vibration and ensuring reliability during electric drive. When manual operation is required, the motor can be quickly and easily disengaged, switching to hand-crank mode. This design ensures both automation convenience and manual emergency capability, guaranteeing that the rear door can be opened or closed promptly under various combat and transportation conditions, thus addressing the core requirements of rapid loading and unloading and cargo protection.

[0063] By separating the slide 13 and the elastic element 131, the present invention enables the drive motor 41 to be separated from the scroll body 21 when it is necessary to rotate the scroll body 21 manually, thereby reducing the influence of the drive motor 41 on the manual rotation of the scroll body 21.

[0064] The above is a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A vehicle body protection device comprising a vehicle body main body (1), characterized by, Also includes: The roller structure (2) is rotatably connected to the main body of the carriage (1), and the flexible roller blind structure (3) is connected thereto. The roller structure (2) can rotate to roll up or lay the flexible roller blind structure (3) to open or close the rear door (10) of the carriage. The drive assembly (4) that drives the rotation of the roller structure (2), the stop assembly (5) that receives the position information of the flexible roller structure (3) when it is rolled up or laid out, and the main control module (6) that is electrically connected to the drive assembly (4) and the stop assembly (5) respectively. The main control module (6) is used to receive the information from the stop assembly (5) to control the drive assembly (4) to drive the roller structure (2).

2. The vehicle bed guard of claim 1, wherein, The scroll structure (2) includes a scroll body (21), and the carriage body includes side beams (11) located on both sides of the rear door (10) of the carriage. The scroll body (21) is rotatably connected to the top gear of the side beams (11).

3. The vehicle bed guard of claim 2, wherein, The side beam (11) has a vertical guide groove (111) on its inner side, which is used to guide the side end of the flexible roller blind structure (3) to rise or fall.

4. The vehicle bed protection apparatus of claim 3, wherein, The flexible roller blind structure (3) includes a chain structure (31) connected to the upper end of the roller body (21) and a plurality of horizontal rotating shaft structures (32) rotatably disposed on the chain structure (31). The chain structure (31) can be rolled up around the roller body (21) or unfolded and suspended below the roller body (21). The two ends of the horizontal rotating shaft structure (32) are respectively inserted into the vertical guide groove (111).

5. The vehicle bed protection apparatus of claim 3 or 4, wherein, The scroll body (21) is provided with a limiting spiral guide groove (22), and the groove of the limiting spiral guide groove (22) is provided with a stop impact platform (23). The stop assembly (5) includes a first limit switch (51) slidably connected to the carriage body. The first limit switch (51) is provided with a switch spring arm (511) extending into the limit spiral guide groove (22). The roller body (21) rotates and retracts the flexible roller shutter structure (3), which allows the switch spring arm (511) to slide along the limit spiral guide groove (22) and strike the stop impact platform (23) and trigger the first limit switch (51).

6. The vehicle bed protection apparatus of claim 5, wherein, The carriage body (1) is provided with a transverse slide shaft (12) parallel to the axis of the scroll body (21), and the first limit switch (51) is slidably disposed on the transverse slide shaft (12).

7. The vehicle bed guard of claim 5, wherein, The stop component (5) also includes a second limit switch (52) electrically connected to the main control module (6). The second limit switch (52) is located at the bottom of the vertical guide groove (111). The horizontal rotating shaft structure (32) at the lowest point of the chain structure (31) can abut against the trigger end of the second limit switch (52).

8. The vehicle bed guard of claim 2, wherein, It also includes a manual drive structure (7), which includes a linkage shaft (71), a first gearbox (72), a second gearbox (73), and a manual crank (74). The other end of the reel body (21) is connected to the first gearbox (72) in the horizontal direction. The upper and lower ends of the linkage shaft (71) are connected to the first gearbox (72) and the second gearbox (73) in the vertical direction, respectively. The second gearbox (73) is connected to the manual crank (74) in the horizontal direction.

9. The vehicle bed protection apparatus of claim 8, wherein, A transmission snap hole (211) is provided at one end of the scroll body (21). The drive assembly (4) includes a drive motor (41), and the output shaft of the drive motor (41) is provided with a transmission engagement part (411) that cooperates with the transmission engagement hole (211).

10. The vehicle bed protection apparatus of claim 9, wherein, The main body (1) of the carriage is also provided with a separation slide (13), the drive motor (41) is provided on the separation slide (13), and an elastic element (131) is provided between the separation slide (13) and the main body (1). The elastic element (131) pushes the separation slide (13) to move toward the roller body (21) so that the transmission locking part (411) is installed in the transmission locking hole (211).

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