A trailer single-side three-fold rear swing type side door

Abstract

The application relates to the technical field of trailer folding side door, in particular to a trailer single-side three-fold rear swing type side door which comprises a three-fold door assembly, a carriage assembly and a plurality of locking pieces. The carriage assembly comprises a bottom plate and a fixed door panel, the fixed door panel is arranged on the bottom plate, and the bottom plate is arranged on a chassis. The three-fold door assembly comprises a first door, a second door and a third door, the third door is rotationally arranged on the fixed door panel, the second door is rotationally arranged on the third door, and the first door is rotationally arranged on the second door. The first door, the second door and the third door are locked on the bottom plate through the locking pieces. The three-fold door assembly of the application is closely arranged on the outside of the fixed door panel, and folding and storage are completed. The risk of being scratched by external objects or colliding with other vehicles is reduced, large or high goods can be quickly loaded and unloaded, and the loading and unloading efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of trailer folding door technology, and in particular to a single-side three-fold rear-swing side door for trailers. Background Technology

[0002] Box trailers are a common type of road transport vehicle, widely used in logistics and express delivery, food transportation, electronic product distribution, and wholesale of daily necessities. They can adapt to the loading needs of goods of different sizes and sensitivity. Standard box trailers have a regular interior space, and the side and rear doors facilitate quick loading and unloading. Some models are also equipped with side curtains or lift-up tailgates, further improving operational flexibility and efficiency.

[0003] Currently, Chinese invention patent application CN113482486A, published on October 8, 2021, proposes a segmented wing-opening structure for a box trailer, comprising the following structure: a trailer body, consisting of a floor plate, a top plate, four uprights, two side end plates, and two side panels; the top plate is connected to a drive mechanism; the uprights are located at the corners of the trailer body; the side panels include an upper panel and a lower panel; the inner side of the upper panel is rotatably connected to a horizontally arranged rotating shaft and two vertically arranged lead screws; both ends of the rotating shaft are rotatably connected to the two uprights respectively; the rotating shaft is connected to the output end of the drive mechanism and is also connected to the two lead screws for transmission; the inner side of the lower panel is connected to two vertically arranged lead screw tubes; the lead screw tubes are threadedly connected to the lead screws for transmission.

[0004] When the side panel is folded, the drive mechanism works to drive the rotating shaft to rotate. The rotating shaft is connected to the lead screw drive, which drives the lead screw to rotate. The lead screw drives the lead screw tube to move, causing the lower panel to move along the height direction. When it moves to the outside of the upper panel, the upper part of the lower panel is close to the upper part of the upper panel, and then the upper panel swings outward to open the door.

[0005] Regarding the aforementioned technologies, the side panels that fold outwards are exposed on the side of the vehicle body, making them susceptible to scratches and collisions from external objects when the vehicle is moving or parked on the roadside. Moreover, due to the limited installation position of the folding axle, when the side panels are fully open, if cargo is loaded or unloaded on that side, and the height of the cargo exceeds the vertical distance from the axle to the bottom panel, it will interfere with the side panels or the axle mechanism, not only affecting loading and unloading efficiency but also potentially damaging the cargo or the vehicle body itself. Summary of the Invention

[0006] This application provides a single-side three-fold rear-swing side door for a trailer. The three-fold door assembly is flush against the outside of the fixed side panel, allowing for easy folding and storage. This reduces the risk of being scratched by external objects or colliding with other vehicles, and facilitates the rapid entry and exit of large or high-level goods, thereby improving loading and unloading efficiency.

[0007] A single-sided three-fold rear-swing side door for a trailer, comprising: Three-folding door assembly, carriage assembly and several locking components; The carriage assembly includes a floor plate and a fixed carriage plate, the fixed carriage plate being disposed on the floor plate, and the floor plate being disposed on the chassis; The three-fold compartment door assembly includes a first compartment door, a second compartment door, and a third compartment door. The third compartment door is rotatably mounted on the fixed compartment plate, the second compartment door is rotatably mounted on the third compartment door, and the first compartment door is rotatably mounted on the second compartment door. The first compartment door, the second compartment door, and the third compartment door are respectively locked to the base plate by the locking member.

[0008] By adopting the above technical solution, under normal use, the first, second, and third doors are locked to the base plate by locking devices, with their bottoms in contact with the base plate, thus achieving a stable closure of the entire door assembly and effectively ensuring safety during transportation. When folding for storage is required, the locking devices are first unlocked, and the first door is swung, causing the second door, which is hinged to it, to swing as well. The second door then drives the third door in a coordinated motion, achieving synchronous movement of all three doors. Specifically, during the folding process, the three-fold door assembly first swings backward along the length of the vehicle body, then swings the first door along the width of the vehicle body, causing the third door to be close to the rear of the fixed panel; next, the first door swings forward along the length of the vehicle body, causing the first and second doors to gradually fold together until they are all close to the outside of the fixed panel, completing the folding and storage. Compared with the traditional side-folding storage method, this design saves external space, reduces the risk of being scratched by external objects or colliding with other vehicles, and also improves the vehicle's maneuverability and parking convenience in narrow environments. When loading and unloading goods, the loading and unloading height is not limited by the three-fold door assembly structure, which facilitates the rapid entry and exit of large or high-level goods, thereby improving the efficiency of loading and unloading operations and reducing the possibility of accidental damage to goods or the carriage structure due to inconvenient operation.

[0009] Optionally, the three-fold compartment door assembly further includes several connecting plates, one end of which is rotatably mounted on the fixed compartment plate, and the other end of which is mounted on the end of the third compartment door away from the second compartment door. The connecting plate can abut against the fixed compartment plate.

[0010] By adopting the above technical solution, during normal use, the side of the connecting plate connected to the third compartment door contacts the fixed compartment plate to achieve the positioning of the third compartment door, which is convenient for locking with locking components. When folding the three-fold compartment door assembly, the third compartment door drives the connecting plate to swing. When the third compartment door is close to the tail of the fixed compartment plate, the side of the connecting plate away from the third compartment door contacts the fixed compartment plate, thereby ensuring that the entire folding process is stable and smooth, the structure is compact, and it is easy to store and unfold.

[0011] Optionally, the three-fold compartment door assembly also includes several magnets disposed on the connecting plate, which are capable of magnetically attracting the fixed compartment panel.

[0012] By adopting the above technical solution, not only can the magnetic force provided by the magnet be used to achieve auxiliary positioning and temporary fixation, but it can also ensure that the connecting plate and the fixed plate maintain a tight and stable fit when the door is closed, thereby enhancing the overall structural closure reliability and effectively avoiding accidental loosening caused by vehicle vibration or external wind pressure.

[0013] Optionally, it also includes a support plate, which is disposed on the fixed panel, and the lower side of the first door can abut against the support plate.

[0014] By adopting the above technical solution, when the first and second doors are folded up, they will naturally sag due to their own weight. If there is no supporting structure below, their weight will act entirely on the hinge point between the first and second doors, causing this connection to bear excessive bending moment and shear force, which can easily lead to deformation or damage over time. The addition of a support plate can directly transfer the weight of the door to the base plate, significantly reducing the load on the hinge and improving the structural stability and service life of the folding door in the folded state.

[0015] Optionally, it also includes a temporary fixing component, which includes a baffle and two first reset components. The baffle is rotatably disposed on the support plate, and the fixed end of the first reset component is disposed on the support plate, while the free end is disposed on the baffle.

[0016] By adopting the above technical solution, under normal conditions, the baffle is vertical. When the three-fold door assembly is folded, as the first door approaches the baffle, the free end of the moving reset component changes the baffle from a vertical to a horizontal state. The first door swings onto the support plate, and after passing the baffle, the free end of the reset component is released, allowing the baffle to return to its original position and fit tightly against the side edge of the first door, forming a physical limit. This effectively suppresses minor swaying or displacement of the door caused by wind, enhancing the overall stability and safety of the structure in the folded state. When resetting the three-fold door assembly, the baffle needs to be changed from a vertical to a horizontal state first, and the baffle should be reset after the first door moves away from the temporary fixing component.

[0017] Optionally, the temporary fixing component further includes a claw, a second reset component, and a limiting rod. The claw has a slot, and the limiting rod can be inserted into the slot. The end of the limiting rod is located at the free end of the first reset component, the claw is located at the free end of the second reset component, and the fixed end of the second reset component is located on the support plate.

[0018] By adopting the above technical solution, under normal conditions, the limit rod is inserted into the slot, and the baffle is in a horizontal state. When the three-fold door assembly folds, the first door moves onto the support plate, passes the baffle, and then moves downwards, causing the claw to move the free end of the second reset component, disengaging the limit rod from the slot, resetting the first reset component, making the baffle vertical, blocking the first door, and resetting the second reset component. When the three-fold door assembly needs to be reset, first move the claw downwards and hold it, then move the free end of the reset component to make the baffle horizontal, release the claw, reset the second reset component, insert the limit rod into the slot, release the free end of the first reset component, and then swing the first door. If this linkage locking mechanism of claw, second reset component, and limit rod is not provided, when the baffle is in a vertical state, if the first door swings too much, it is very easy to collide violently with the baffle, which may not only cause deformation and surface damage to the baffle structure, but also affect the reliability of its blocking function in the long run, reducing the service life and safety of the overall device.

[0019] Optionally, the temporary fixing component further includes an unlocking block, which is disposed on the claw and at the free end of the second reset component. The upper end of the unlocking block is an arc surface and a horizontal surface, and the first door can abut against the arc surface and the horizontal surface.

[0020] By adopting the above technical solution, when the first door swings inward and first contacts the arc surface of the unlocking block, the first door pushes the unlocking block downward in the vertical direction under the guidance of the arc surface. The downward movement of the unlocking block causes the connected claw to move downward synchronously, and the unlocking block causes the free end of the second reset component to move downward. This linkage process causes the limiting rod, which was originally embedded in the slot, to disengage from the slot, releasing the locking constraint on the baffle. At this time, the baffle returns to a horizontal state under the action of the relevant reset mechanism. As the first door continues to move until it abuts against the horizontal surface of the unlocking block, the entire system reaches a stable position, thereby realizing that the baffle can automatically and smoothly rise to the working position during the folding and closing process of the first door, improving operating efficiency.

[0021] Optionally, the temporary fixing assembly further includes a plurality of positioning pins and retaining members. The fixed end of the retaining member is disposed on the claw, and the positioning pin is disposed on the free end of the retaining member. The positioning pin can abut against the baffle. The baffle has positioning holes in the width direction, the same number as the number of positioning pins, and the positioning pin can be inserted into the positioning holes.

[0022] By adopting the above technical solution, when the first door contacts the horizontal plane, the limiting rod disengages from the slot, and the baffle swings under the action of the first reset component, causing the positioning pin to move downwards. The positioning pin then moves the free end of the retaining member until the baffle is vertical. At this point, the positioning pin matches the positioning hole, the retaining member returns to its original position, and the positioning pin automatically inserts into the positioning hole, thus locking the baffle in place. Even when there is strong wind outdoors or the first door is subjected to large external forces such as accidental collisions or vibrations during opening and closing, the baffle can maintain a stable vertical posture because multiple positioning pins are reliably inserted into their corresponding positioning holes simultaneously, forming multi-point rigid constraints. When the first door swings or is impacted horizontally by wind or inertia, the baffle can effectively transmit the horizontal force to the claws and the entire fixing component base through the positioning pin-hole mating structure, thereby fully utilizing its lateral blocking and limiting functions to ensure that the first door is firmly and reliably positioned in the temporarily open state. This enhances the stability of the temporary fixing component under complex working conditions. When the first door resets, the entire locking claw moves downwards until the unlocking block contacts the fixed end of the second reset assembly. At this point, the positioning pin disengages from the positioning hole. The first door swings, causing it to contact and move the baffle until it is horizontal. The first door then contacts the baffle, maintaining its horizontal position. The locking claw is released, and the second reset assembly resets the locking claw, causing the positioning pin to abut against the baffle, and the limit rod enters the slot. The first door continues to swing, resetting the three-fold door assembly.

[0023] Optionally, the end of the baffle near the positioning pin is an arc-shaped portion, and the upper end of the positioning pin is a hemispherical portion, which can abut against the arc-shaped portion.

[0024] By adopting the above technical solution, the arc-shaped part contacts the hemispherical part, and the locating pin does not move when the baffle swings, greatly reducing the frictional resistance and wear between the baffle and the locating pin during the swing. This not only makes the baffle movement smoother and easier, reducing the operating force, but also improves the alignment of the locating pin during the contact and insertion into the locating hole, making the locking and unlocking actions more precise and reliable. It also avoids affecting the fitting accuracy due to friction debris, thereby extending the service life of the locating pin, retaining element, and related parts of the baffle, and improving the overall durability and maintenance convenience of the assembly.

[0025] Optionally, the unlocking block is slidably disposed on the support plate in a vertical direction.

[0026] By adopting the above technical solution, when the first door contacts and drives the unlocking block to move, the unlocking block moves along the height direction, which facilitates the limit rod to disengage from the slot, thereby effectively completing the unlocking action and improving the reliability and smoothness of the mechanism operation.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. The folding door assembly of this application is flush against the outside of the fixed compartment panel, completing the folding and storage. Compared with the traditional side-folding storage method, it saves external space, reduces the risk of being scratched by external objects or colliding with other vehicles, and improves the vehicle's maneuverability and parking convenience in narrow environments. When loading and unloading goods, the loading and unloading height is not limited by the three-folding door assembly structure, facilitating the rapid entry and exit of large or high-level goods, thereby improving loading and unloading efficiency and reducing the possibility of accidental damage to goods or the compartment structure due to inconvenient operation.

[0028] 2. In this application, the first door swings and contacts the unlocking block, pushing the unlocking block downwards in the vertical direction, causing the free end of the second reset component to move downwards. This causes the limiting rod, which was originally embedded in the slot, to disengage from the slot, releasing the locking constraint on the baffle. At this time, the baffle returns to a horizontal state under the action of the relevant reset mechanism. As the first door continues to move until it abuts against the horizontal surface of the unlocking block, the entire system reaches a stable position, thereby enabling the baffle to automatically and smoothly rise to the working position during the folding and closing process of the first door, improving operational efficiency.

[0029] 3. The arc-shaped portion of this application contacts the hemispherical portion, greatly reducing the frictional resistance and wear between the baffle and the positioning pins during the baffle's swing. Multiple positioning pins are simultaneously and reliably inserted into their corresponding positioning holes, forming multi-point rigid constraints, ensuring the baffle maintains a stable vertical posture. When the first door experiences horizontal swinging or impact due to wind or inertia, the baffle can effectively transmit the horizontal force to the claws and the entire fixing component base through the positioning pin-hole mating structure, thereby fully utilizing its lateral blocking and limiting functions to ensure the first door is firmly and reliably positioned in the temporarily open state. This enhances the stability of the temporary fixing component under complex working conditions. Attached Figure Description

[0030] Figure 1 This is a three-dimensional structural diagram of an embodiment of this application; Figure 2 This is a schematic diagram of the three-fold compartment door assembly after folding according to an embodiment of this application; Figure 3 This is a partial three-dimensional structural diagram of the three-fold compartment door assembly according to an embodiment of this application; Figure 4 This is an exploded view of the temporary fixing component according to an embodiment of this application; Figure 5 This is a partial cutaway perspective view of the temporary fixing component according to an embodiment of this application. Figure 1 ; Figure 6 This is a schematic diagram of the three-dimensional structure of the baffle according to an embodiment of this application; Figure 7This is a partial cutaway perspective view of the temporary fixing component according to an embodiment of this application. Figure 2 ; Figure 8 This is a schematic diagram of the initial state of the temporary fixing component according to an embodiment of this application; Figure 9 This is a schematic diagram of the first door pressing and unlocking block process in an embodiment of this application; Figure 10 This is a schematic diagram of the locating pin unlocking process according to an embodiment of this application; Figure 11 This is a schematic diagram of the folding process of the three-fold compartment door assembly according to an embodiment of this application. Figure 1 ; Figure 12 This is a schematic diagram of the folding process of the three-fold compartment door assembly according to an embodiment of this application. Figure 2 .

[0031] Figure label: 100. Tri-folding compartment door assembly; 110. First compartment door; 120. Second compartment door; 130. Third compartment door; 140. Connecting plate; 150. Magnet; 200. Carriage assembly; 210. Floor plate; 220. Fixed carriage panel; 221. Tail panel; 222. Column; 223. Large side panel; 224. Front panel; 225. Small side panel; 300. Locking components; 400, Support plate; 410, Through groove; 420, Guide groove; 500. Temporary fixing component; 510. Baffle; 511. Positioning hole; 512. Arc portion; 513. Baffle body; 514. Driven shaft; 515. Rotating shaft; 520. First reset component; 521. First spring; 522. Slider; 523. Drive shaft; 524. Connecting rod; 530. Claw; 531. Slot; 540. Second reset component; 541. Reset cylinder; 542. Second spring; 543. Reset rod; 550. Limiting rod; 551. Limiting rod body; 552. Connecting plate; 560. Unlocking block; 561. Arc surface; 562. Horizontal surface; 563. Track groove; 570. Positioning pin; 571. Hemispherical portion; 572. Connecting rod; 580. Holding component; 581. Holding cylinder; 582. Third spring; 590. Mounting plate; 591. Track; 600. Chassis. Detailed Implementation

[0032] The following combination Figures 1 to 12 This application will be described in further detail.

[0033] Example 1: Reference Figure 1 and Figure 2This embodiment provides a single-side three-fold rear-swing side door for a trailer. Its overall structure includes a three-fold door assembly 100, a cargo box assembly 200, and several locking components 300. The cargo box assembly 200 is mounted on a chassis 600, the three-fold door assembly 100 is mounted on the cargo box assembly 200, and the locking components 300 are used to fix the three-fold door assembly 100.

[0034] refer to Figure 1 The carriage assembly 200 includes a floor plate 210 and a fixed panel 220. The fixed panel 220 is mounted on the floor plate 210, and the floor plate 210 is mounted on the chassis 600. The three-fold door assembly 100 is mounted on the fixed panel 220 and abuts against the floor plate 210.

[0035] refer to Figure 2 The fixed compartment panel 220 includes a tail panel 221, a column 222, a large side panel 223, a front panel 224, and a small side panel 225. The tail panel 221, the column 222, the large side panel 223, the front panel 224, and the small side panel 225 are installed on the bottom plate 210. The column 222, the tail panel 221, the large side panel 223, the front panel 224, and the small side panel 225 are sequentially fixedly connected. The three-fold compartment door assembly 100 is rotatably connected to the column 222.

[0036] refer to Figure 1-3 The three-fold compartment door assembly 100 includes a first compartment door 110, a second compartment door 120, a third compartment door 130, several connecting plates 140, and at least one magnet 150. One end of the connecting plate 140 is rotatably connected to the column 222, and the other end is located at the end where the third compartment door 130 is installed, away from the second compartment door 120. One side of the connecting plate 140 can abut against the column 222, and the other side can abut against the tail plate 221. The magnet 150 is installed on the connecting plate 140 and can magnetically attract the tail plate 221 and the column 222. The second compartment door 120 is rotatably mounted on the third compartment door 130, and the first compartment door 110 is rotatably mounted on the second compartment door 120. The first compartment door 110, the second compartment door 120, and the third compartment door 130 are respectively locked to the base plate 210 by the locking member 300.

[0037] The locking component 300 includes, but is not limited to, a pull-type single-pin post lock, a vertical bar lock, a railing hook lock, and a box bolt lock.

[0038] refer to Figure 1-3Under normal use, the first door 110, the second door 120 and the third door 130 are locked to the base plate 210 by the locking device 300. The bottom of the three doors are in contact with the base plate 210, and the connecting plate 140 contacts the column 222, thereby realizing the stable closure of the entire door and effectively ensuring the safety during transportation.

[0039] When loading and unloading goods and folding is required, the locking device 300 is first unlocked. The first compartment door 110 is then swung, causing the hinged second compartment door 120 to swing accordingly. The second compartment door 120 then drives the third compartment door 130, connecting plate 140, and magnet 150 in a synchronized motion. Specifically, during the folding process, the three-fold compartment door assembly 100 first swings backward along the length of the compartment, then swings the first compartment door 110 along the width of the compartment, causing the third compartment door 130 to press against the tail panel 221. The connecting plate 140, on the side away from the third compartment door 130, contacts the tail panel 221, and the magnet 150 magnetically attracts the tail panel 221. Next, the first compartment door 110 swings forward along the length of the compartment, causing it and the second compartment door 120 to gradually fold together until they are flush against the outside of the large side panel 223, completing the folding and storage process.

[0040] refer to Figure 1-3 Compared to traditional side-folding storage methods, this design significantly saves external space, reducing the risk of being scratched by external objects or colliding with other vehicles, while also improving the vehicle's maneuverability and parking convenience in narrow environments. During loading and unloading, the cargo height is not limited by the three-fold door assembly 100 structure, facilitating the rapid entry and exit of large or high-level goods, thereby improving loading and unloading efficiency and reducing the possibility of accidental damage to goods or the vehicle structure due to operational inconvenience. The three-fold door assembly 100 can not only achieve auxiliary positioning and temporary fixation with the magnetic force provided by the magnet 150, but also ensure a tight and stable fit between the connecting plate 140 and the column 222 when the door is closed, thus enhancing the overall structural closure reliability. It also effectively prevents accidental loosening caused by vehicle movement (low-speed, short-distance movement of the three-fold door assembly 100 after folding) or external wind pressure.

[0041] Example 2: Reference Figure 2 This embodiment provides a single-side three-fold rear-swing side door for a trailer, the overall structure of which also includes a support plate 400 and a temporary fixing component 500; the support plate 400 is mounted on the base plate 210, and the temporary fixing component 500 is mounted on the support plate 400. The support plate 400 provides auxiliary support for the three-fold side door assembly 100 when folded, and the temporary fixing component 500 provides temporary fixation for the three-fold side door assembly 100 when folded. refer to Figure 2The support plate 400 is located near the middle of the large side plate 223, and the lower side of the first door 110 can abut against the support plate 400.

[0042] refer to Figure 2 When the first door 110 and the second door 120 are folded up, they will naturally sag due to their own weight. If there is no supporting structure below, their weight will be entirely applied to the hinge point between the first door 110 and the second door 120, causing this connection to bear excessive bending moment and shear force, which can easily lead to deformation or damage over time. The addition of the support plate 400 can directly transfer the weight of the door to the bottom plate, significantly reducing the load on the hinge and improving the structural stability and service life of the folding door in the folded state.

[0043] refer to Figure 4 and 5 The temporary fixing assembly 500 includes a baffle 510, two first reset components 520, a claw 530, two second reset components 540, a limiting rod 550, an unlocking block 560, several positioning pins 570, a connecting rod 572, a retaining member 580 in the same number as the positioning pins 570, a mounting plate 590, and two tracks 591. The baffle 510 is rotatably connected to the support plate 400. The fixed end of the first reset component 520 is disposed on the support plate 400, and the free end is disposed on the baffle 510. The mounting plate 590 is L-shaped and is installed on the lower side of the support plate 400. The two tracks 591 are installed on the mounting plate 590 with the symmetrical plane of the length direction of the support plate 400 as the center. The unlocking block 560 has symmetrical track grooves 563, and the symmetrical tracks 591 are respectively slidably disposed in the track grooves 563. The second reset components 540 are fixed... The fixed end is installed on the mounting plate 590, the unlocking block 560 is installed on the free end of the second reset component 540, the support plate 400 has a through groove 410, the unlocking block 560 is slidably disposed in the through groove 410, the claw 530 is installed on the unlocking block 560, the claw 530 has a slot 531, the limiting rod 550 can be inserted into the slot 531, the end of the limiting rod 550 is installed on the free end of the first reset component 520, the fixed end of the retaining member 580 is installed on the claw 530, the positioning pin 570 is installed on the free end of the retaining member 580, the positioning pin 570 can abut against the baffle 510, the baffle 510 has a number of positioning holes 511 in the width direction equal to the number of positioning pins 570, the positioning pin 570 can be inserted into the positioning holes 511, and the positioning pin 570 is installed on the connecting rod 572.

[0044] refer to Figure 6The baffle 510 includes a baffle body 513, two driven shafts 514 and a rotating shaft 515. The rotating shaft 515 is installed at one end of the baffle body 513, and the driven shafts 514 are installed on one side of the baffle body 513. The rotating shaft 515 is rotatably connected to the support plate 400. The baffle body 513 has an arc-shaped portion 512 at the end near the rotating shaft 515. The baffle body 513 has positioning holes 511 in the width direction at the end near the rotating shaft 515, the same number as the positioning pins 570. The upper end of the positioning pin 570 is a hemispherical portion 571, which can abut against the arc-shaped portion 512.

[0045] refer to Figure 4 The first reset component 520 includes a first spring 521, a slider 522, a drive shaft 523, and a connecting rod 524. The support plate 400 has symmetrical guide grooves 420. The first spring 521 is disposed in the guide groove 420. The slider 522 is slidably disposed in the guide groove 420. One end of the first spring 521 is connected to the support plate 400, and the other end is connected to the slider 522. The drive shaft 523 is mounted on the slider 522. One end of the connecting rod 524 is rotatably connected to the drive shaft 523, and the other end is rotatably connected to the driven shaft 514.

[0046] refer to Figure 4-6 When the limiting rod 550 is inserted into the slot 531, the first spring 521 is stretched. After the limiting rod 550 is disengaged from the slot 531, the first spring 521 returns to its original position. The first spring 521 drives the slider 522 to move along the guide groove 420. The slider 522 drives the drive shaft 523 to move. The drive shaft 523 drives the connecting rod 524 to swing. The connecting rod 524 drives the driven shaft 514 to swing. The driven shaft 514 drives the baffle body 513 to swing. The baffle body 513 drives the rotating shaft 515 to rotate, so that the baffle body 513 changes from a horizontal state to a vertical state.

[0047] refer to Figure 4-6The arc portion 512 contacts the hemispherical portion 571, greatly reducing the frictional resistance and wear between the baffle 510 and the positioning pin 570 during the swinging motion. This not only makes the movement of the baffle 510 smoother and easier, reducing the operating force, but also improves the alignment of the positioning pin 570 during the contact and insertion into the positioning hole 511, making the locking and unlocking actions more precise and reliable. It also avoids affecting the fitting accuracy due to friction debris, thereby extending the service life of the positioning pin 570, the retainer 580, and related parts of the baffle 510, and improving the overall durability and maintenance convenience of the components. Even when there is strong wind outdoors or the first door 110 is subjected to large external forces such as accidental collisions or vibrations during opening and closing, the baffle 510 can always maintain a stable vertical posture because multiple positioning pins 570 are reliably inserted into the corresponding positioning holes 511 at the same time, forming multi-point rigid constraints. At this time, when the first door 110 swings or is impacted horizontally by wind or inertia, the baffle 510 can effectively transmit the horizontal force to the claw 530 and the entire fixing component base through the positioning pin-hole mating structure, thereby giving full play to its lateral blocking and limiting functions and ensuring that the first door 110 is firmly and reliably positioned in the temporarily open state. This enhances the stability of the temporary fixing component under complex working conditions.

[0048] refer to Figure 7 The second reset assembly 540 includes a reset cylinder 541, a second spring 542, and a reset rod 543. The reset cylinder 541 is mounted on the mounting plate 590. The lower ends of the second spring 542 and the reset rod 543 are disposed inside the reset cylinder 541. The upper end of the second spring 542 is connected to the lower end of the reset rod 543, and the lower end is connected to the reset cylinder 541. The unlocking block 560 is mounted on the upper end of the reset rod 543. The upper end of the unlocking block 560 is an arc surface 561 and a horizontal surface 562. The first door 110 can abut against the arc surface 561 and the horizontal surface 562.

[0049] refer to Figure 4 The limiting rod 550 includes a limiting rod body 551 and two connecting plates 552. The connecting plates 552 are mounted on the drive shaft 523, and the limiting rod body 551 is mounted on the connecting plates 552 and inserted into the slot 531.

[0050] Initial state reference Figure 8 The limiting rod 551 is positioned within the slot 531, and the baffle body 513 is horizontal. When the first door 110 swings inward and first contacts the arc surface 561 of the unlocking block 560, reference... Figure 9Guided by the arc surface 561, the first door 110 pushes the unlocking block 560 to move downwards in the vertical direction. The downward movement of the unlocking block 560 causes the connected claw 530 to move downwards simultaneously. The unlocking block 560 causes the reset rod 543 to move downwards along the reset cylinder 541. The reset rod 543 and the reset cylinder 541 squeeze the second spring 542, the limiting rod 551 disengages from the slot 531, the first spring 521 returns to its original position, so that the baffle 510 is close to the first door 110, the first door 110 contacts the horizontal surface 562, and the positioning pin 570 automatically inserts into the positioning hole 511.

[0051] refer to Figure 8 This linkage process causes the limiting rod 551, which was originally embedded in the slot 531, to disengage from the slot 531, releasing the locking constraint on the baffle 510. At this time, the baffle 510 returns to a vertical state under the action of the relevant reset mechanism. As the first door 110 continues to move until it abuts against the horizontal surface 562 of the unlocking block 560, the entire system reaches a stable position, thereby enabling the baffle 510 to automatically and smoothly rise to the working position during the folding and closing process of the first door 110, improving operational efficiency. Moreover, when the first door 110 is in the folded state, the baffle 510 is close to the first door 110, the first door 110 contacts the horizontal surface 562, and the positioning pin 570 automatically inserts into the positioning hole 511 to lock the position of the baffle 510. The baffle 510 can automatically and smoothly rise to the preset horizontal position and lock without manual intervention, significantly improving operational efficiency and automation.

[0052] refer to Figure 5 The retaining member 580 includes a retaining sleeve 581 and a third spring 582. The retaining sleeve 581 is mounted on the claw 530. The lower ends of the third spring 582 and the positioning pin 570 are disposed inside the retaining sleeve 581. The lower end of the third spring 582 is connected to the retaining sleeve 581, and the upper end is connected to the positioning pin 570.

[0053] refer to Figure 5When the baffle body 513 is in a horizontal state, the hemispherical part 571 contacts the arc part 512, and the third spring 582 is compressed. The limiting rod 551 disengages from the slot 531, and under the action of the first spring 521, the swing baffle body 513 swings, and the positioning pin 570 does not move until the baffle body 513 is vertical. At this time, the positioning pin 570 matches the position of the positioning hole 511, the third spring 582 returns to its original position, and the positioning pin 570 automatically inserts into the positioning hole 511, thereby locking the position of the baffle 510. When the first door 110 resets, the entire locking claw 530 moves downwards. The locking claw 530 drives the unlocking block 560 to move downwards along the track 591. The locking claw 530 also drives the retaining cylinder 581 to move downwards. The third spring 582 gradually returns to its original position until the positioning pin 570 begins to move downwards. The positioning pin 570 drives the connecting rod 572 to move downwards. The unlocking block 560 drives the reset rod 543 to move downwards along the reset cylinder 541. The reset rod 543 and the reset cylinder 541 press against the second spring 542. Until the unlocking block 560 contacts the fixed end of the reset cylinder 541, the positioning pin 570 disengages from the positioning hole 511, the first door 110 swings, making it contact and drive the baffle body 513 to move until the baffle body 513 is horizontal. At this time, the first door 110 contacts the baffle body 513, keeping it in a horizontal state, the pawl 530 is released, the second spring 542 returns to drive the pawl 530 to reset, so that the positioning pin 570 abuts against the baffle body 513, and the limiting rod 551 enters the slot 531.

[0054] The working principle of this embodiment is as follows: First, unlock the locking component 300, refer to... Figure 11 The first folding door 110 swings, causing the second folding door 120, which is hinged to it, to swing as well. The second folding door 120 then drives the third folding door 130, the connecting plate 140, and the magnet 150 in a coordinated manner, achieving synchronous movement of the three doors. Specifically, during the folding process, the three-folding door assembly 100 first swings backward along the length of the carriage, then swings the first folding door 110 along the width of the carriage, causing the third folding door 130 to press against the tail panel 221. The connecting plate 140, on the side away from the third folding door 130, contacts the tail panel 221, and the magnet 150 magnetically attracts the tail panel 221. Next, the first folding door 110 swings forward along the length of the carriage, causing the first folding door 110 and the second folding door 120 to gradually fold together until they are pressed tightly against the outside of the large side panel 223. (Refer to...) Figure 12 .

[0055] When the first door 110 swings inward and first contacts the arc surface 561 of the unlocking block 560, refer to Figure 9Guided by the arc surface 561, the first door 110 pushes the unlocking block 560 to move downwards vertically. The downward movement of the unlocking block 560 causes the connected claw 530 to move downwards simultaneously. The claw 530 causes the unlocking block 560 to move downwards along the track 591, which in turn causes the retaining cylinder 581 to move downwards. The third spring 582 gradually recovers, and the unlocking block 560 causes the reset rod 543 to move downwards along the reset cylinder 541. The reset rod 543 and the reset cylinder 541 press against the second spring 542, keeping the hemispherical part 571 in contact with the arc part 512. The third spring 582 is in a compressed state, the limiting rod 551 disengages from the slot 531, the first spring 521 recovers, and the first spring 521 causes the slider 522 to move along the guide groove 420. The slider 522 then drives the main... The moving shaft 523 moves, the driving shaft 523 drives the connecting rod 524 to swing, the connecting rod 524 drives the driven shaft 514 to swing, the driven shaft 514 drives the baffle body 513 to swing, the baffle body 513 drives the rotating shaft 515 to rotate, so that the baffle body 513 changes from a horizontal state to a vertical state. The driving shaft 523 drives the connecting plate 552 and the limiting rod 551 to move, the first door 110 contacts the horizontal surface 562, the third spring 582 returns to its original state, so that the positioning pin 570 is inserted into the positioning hole 511, the third spring 582 is in a compressed state, the baffle body 513 is close to the first door 110, and the first door 110 and the second door 120 are close to the large side plate 223.

[0056] When the first door 110 resets, the entire locking claw 530 moves downwards. The locking claw 530 drives the unlocking block 560 to move downwards along the track 591. The locking claw 530 also drives the retaining cylinder 581 to move downwards. The third spring 582 gradually returns to its original position until the positioning pin 570 begins to move downwards. The positioning pin 570 drives the connecting rod 572 to move downwards. The unlocking block 560 drives the reset rod 543 to move downwards along the reset cylinder 541. The reset rod 543 and the reset cylinder 541 press against the second spring 542. Until the unlocking block 560 contacts the fixed end of the reset cylinder 541, the positioning pin 570 disengages from the positioning hole 511. The first compartment door 110 is swung, causing it to contact and drive the baffle body 513 to move until the baffle body 513 is horizontal. At this point, the first compartment door 110 contacts the baffle body 513, keeping it in a horizontal state. The pawl 530 is released, and the second spring 542 returns to its original position, causing the pawl 530 to reset, so that the positioning pin 570 abuts against the baffle body 513, and the limiting rod 551 enters the slot 531. The first compartment door 110 continues to be swung until the three-fold compartment door assembly 100 resets. The locking member 300 is then used to lock the three-fold compartment door assembly 100.

[0057] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A single-sided three-fold rear-swing side door for a trailer, characterized in that, include: The three-folding door assembly (100), the carriage assembly (200), and several locking components (300); The carriage assembly (200) includes a floor plate (210) and a fixed panel (220), the fixed panel (220) being disposed on the floor plate (210), and the floor plate (210) being disposed on the chassis (600); The three-fold compartment door assembly (100) includes a first compartment door (110), a second compartment door (120) and a third compartment door (130). The third compartment door (130) is rotatably mounted on the fixed compartment plate (220), the second compartment door (120) is rotatably mounted on the third compartment door (130), and the first compartment door (110) is rotatably mounted on the second compartment door (120). The first compartment door (110), the second compartment door (120) and the third compartment door (130) are respectively locked on the base plate (210) by the locking member (300).

2. The trailer single-side three-fold rear-swing side door according to claim 1, characterized in that: The three-fold compartment door assembly (100) also includes several connecting plates (140), one end of which is rotatably mounted on the fixed compartment plate (220), and the other end is mounted on the end of the third compartment door (130) away from the second compartment door (120). The connecting plate (140) can abut against the fixed compartment plate (220).

3. The trailer single-side three-fold rear-swing side door according to claim 2, characterized in that: The triple-folding door assembly (100) also includes several magnets (150), which are disposed on the connecting plate (140) and are capable of magnetically attracting the fixed door panel (220).

4. The trailer single-side triple-fold rear-swing side door according to any one of claims 1 to 3, characterized in that: It also includes a support plate (400), which is disposed on the fixed compartment panel (220), and the lower side of the first compartment door (110) can abut against the support plate (400).

5. The trailer single-side three-fold rear-swing side door according to claim 4, characterized in that: It also includes a temporary fixing component (500), which includes a baffle (510) and two first reset components (520). The baffle (510) is rotatably disposed on the support plate (400). The fixed end of the first reset component (520) is disposed on the support plate (400), and the free end is disposed on the baffle (510).

6. The trailer single-side three-fold rear-swing side door according to claim 5, characterized in that: The temporary fixing component (500) further includes a claw (530), a second reset component (540), and a limiting rod (550). The claw (530) has a slot (531), and the limiting rod (550) can be inserted into the slot (531). The end of the limiting rod (550) is located at the free end of the first reset component (520), and the claw (530) is located at the free end of the second reset component (540). The fixed end of the second reset component (540) is located on the support plate (400).

7. The trailer single-side three-fold rear-swing side door according to claim 6, characterized in that: The temporary fixing component (500) also includes an unlocking block (560), which is disposed on the claw (530) and at the free end of the second reset component (540). The upper end of the unlocking block (560) is an arc surface (561) and a horizontal surface (562), and the first door (110) can abut against the arc surface (561) and the horizontal surface (562).

8. The trailer single-side three-fold rear-swing side door according to claim 7, characterized in that: The temporary fixing assembly (500) also includes a plurality of positioning pins (570) and retaining members (580). The fixed end of the retaining member (580) is disposed on the claw (530), and the positioning pins (570) are disposed on the free end of the retaining member (580). The positioning pins (570) can abut against the baffle (510). The baffle (510) has positioning holes (511) in the width direction, the same number as the number of positioning pins (570). The positioning pins (570) can be inserted into the positioning holes (511).

9. The trailer single-side three-fold rear-swing side door according to claim 8, characterized in that: The baffle (510) has an arc-shaped portion (512) near the positioning pin (570), and the upper end of the positioning pin (570) has a hemispherical portion (571). The hemispherical portion (571) can abut against the arc-shaped portion (512).

10. The single-sided three-fold rear-swing side door of the trailer according to claim 7, characterized in that: The unlocking block (560) is slidably mounted on the support plate (400) in the vertical direction.

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