Multifunctional semi-trailer box rear door structure

Abstract

The utility model discloses a multifunctional semitrailer car box rear door structure, including the horizontal setting rectangular bottom plate, the two first side plates of two first side plates are symmetrically equipped with in the length direction of bottom plate upper side, the second side plate is vertically equipped with in the left side of bottom plate upper side width direction, the right side of bottom plate width direction is horizontally equipped with the support plate, two support posts are symmetrically rotatably connected with in the both sides of support plate, and the distribution direction of two support posts is same with the distribution direction of two first side plates, and two support posts form door frame by mutual cooperation, every support post is correspondingly arranged in the side of first side plate away from second side plate, and every support post is correspondingly and detachably connected with the side of first side plate away from second side plate, and the rear door is rotatably connected between two support posts, and the whole outward opening / removal of door frame stand is realized through the detachable connection of support post and first side plate, and the transverse block of traditional fixed door frame to the tail part of car is thoroughly eliminated.

Description

Technical Field

[0001] This utility model relates to the field of vehicle body technology, specifically to a multi-functional semi-trailer rear door structure. Background Technology

[0002] As a core piece of equipment in highway logistics, the design of the rear door structure of a semi-trailer directly affects loading and unloading efficiency, adaptability to different scenarios, and operational safety. Currently, mainstream semi-trailer rear door systems only allow the rear door to move within a limited area of ​​the door frame. Even with multi-section door designs, the door frame pillars still obstruct the direct entry and exit of goods (especially oversized items). When transporting indivisible large-sized equipment (such as construction machinery and wind turbine blades), a completely unobstructed through-hole at the rear of the trailer is required. Existing technologies require additional disassembly of the door frame structure, which is cumbersome, time-consuming, and compromises the integrity of the trailer. The pillars fixing the door frame encroach on the effective width of the trailer, resulting in wasted space when loading standard containers or pallets. Therefore, there is an urgent need to develop a trailer with an openable rear door frame to solve this problem. Utility Model Content

[0003] The main purpose of this utility model is to provide a multifunctional semi-trailer cargo box rear door structure, which aims to solve the technical problem of wasted space caused by the inability to open the rear door frame of the cargo box in the prior art.

[0004] To achieve the above objectives, the present invention proposes a multifunctional semi-trailer cargo box rear door structure, including a horizontally arranged rectangular base plate. Two first side plates are vertically symmetrically arranged on both sides of the base plate along its length. A second side plate is vertically arranged on the left side of the base plate along its width. The two first side plates and the second side plate cooperate to form a C-shaped structure. A support plate is horizontally arranged on the right side of the base plate along its width. Two pillars are symmetrically rotatably connected to both sides of the support plate. The distribution direction of the two pillars is the same as the distribution direction of the two first side plates. The two pillars cooperate to form a door frame.

[0005] Each of the aforementioned pillars is correspondingly installed on the side of the first side plate away from the second side plate. The end of each pillar away from the support plate is detachably connected to the side of the first side plate away from the second side plate. A rear door is rotatably connected between the two pillars.

[0006] Preferably, each of the first side plates has a first insertion hole formed by a lateral recess on the side opposite to the second side plate, and each of the support columns has a first insertion rod for insertion into the insertion hole on the side near the first side plate, and the first insertion hole is provided with an anti-dislodgement component for preventing the first insertion rod from dislodging from the first insertion hole.

[0007] Preferably, a first receiving hole is vertically recessed on the lower wall of the first insertion hole, and the anti-dislodgement component includes a second insertion rod slidably disposed in the first receiving hole. A first slot for inserting the second insertion rod is recessed on the first insertion rod. One end of the second insertion rod near the bottom of the first receiving hole is connected to the first receiving hole by a spring. The spring is used to push the end of the second insertion rod away from the bottom of the first receiving hole out of the first receiving hole.

[0008] Preferably, a rectangular through hole is formed laterally on the side wall of the first receiving hole, penetrating the outer wall of the first side plate. A first lever is slidably disposed laterally in the through hole. The sliding direction of the first lever is the same as the sliding direction of the second insert. One end of the first lever extends into the first receiving hole and is connected to the second insert. The end of the first lever away from the second insert extends out of the through hole and is connected to the lever plate.

[0009] Preferably, the anti-detachment component further includes a positioning component for preventing the second insertion rod from retracting into the first receiving hole after the second insertion rod extends out of the first receiving hole.

[0010] Preferably, the positioning component includes a positioning block disposed on the same side as the dial plate. The positioning block is slidably disposed on the outer wall of the first side plate. The sliding direction of the positioning block is perpendicular to the sliding direction of the second insertion rod. The positioning block is located on one side of the dial plate when the second insertion rod extends out of the first receiving hole. The side of the positioning block near the dial plate is recessed to form a second slot for the side of the dial plate to be inserted.

[0011] Preferably, the bottom of the slot is provided with a magnet, and the dial is made of a metal material that can attract the magnet.

[0012] Preferably, a second receiving hole is recessed on the upper side of the rear door, and an extension plate is slidably disposed in the second receiving hole. At least one hydraulic cylinder is provided on the side of the extension plate near the bottom of the second receiving hole for moving the extension plate toward or away from the bottom of the second receiving hole.

[0013] Preferably, the rear door has a third receiving hole recessed on the upper sides of the two pillars and on the lower sides of the two pillars; the rear door has two third receiving holes on each side, one on the top and one on the bottom.

[0014] Each of the third receiving holes is arranged laterally toward the adjacent pillar. A third insert rod is slidably provided in the third receiving hole. Each pillar has a horizontal recess on the side near the rear door to form an insertion hole for inserting the third insert rod. A first sliding groove extending to the outer wall of the rear door is formed through the side wall of the third receiving hole. A second lever is slidably provided in the first sliding groove. One end of the second lever extends into the third receiving hole and is connected to the third insert rod, and the other end extends out of the first sliding groove. The sliding direction of the second lever is the same as the sliding direction of the third insert rod.

[0015] The third inserts in the third receiving holes on both sides above the rear door are on the same axis, and the third inserts in the third receiving holes on both sides below the rear door are on the same axis.

[0016] A fourth receiving hole is recessed on the wall of the first sliding groove. A fourth insert rod is slidably disposed in the fourth receiving hole. The extension direction of the fourth receiving hole is perpendicular to the extension direction of the third receiving hole. The fourth receiving hole is located above the third receiving hole. A second sliding groove extending to the outer wall of the rear door is formed through the side wall of the fourth receiving hole. A third lever is slidably disposed in the second sliding groove. One end of the third lever extends into the fourth receiving hole and is connected to the fourth insert rod, while the other end extends out of the second sliding groove.

[0017] Preferably, the end of the second insertion rod away from the bottom of the first receiving hole is an arc-shaped inclined surface that slopes towards the bottom of the first insertion hole; the opening of the insertion hole is arc-shaped, and the end of the third insertion rod away from the bottom of the third receiving hole is a pointed tip; baffles are respectively provided on the side of the two columns that are close to each other, so that the third insertion rod can be inserted into the insertion hole after the rear door contacts the baffle.

[0018] In this invention, the pillar and the first side plate are detachably connected, allowing the entire door frame pillar to be opened / removed outwards, completely eliminating the lateral obstruction of the rear of the vehicle by the traditional fixed door frame. When transporting extra-wide equipment (such as wind turbine blades), an unobstructed through-hole can be formed without disassembling any components, saving disassembly / installation time. It also avoids structural damage caused by repeated disassembly of the door frame. Opening the pillar releases the effective width of the vehicle, preventing the pillar from encroaching on the space of standard containers / pallets. During transport, the pillar is fixed to the first side plate, ensuring driving safety. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall rear door closing structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the overall rear door opening structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the column of this utility model, showing it flipping towards the side away from the first side plate and the column detaching from the first side plate.

[0023] Figure 4 This is a schematic diagram of the cross-sectional structure of the first insertion rod of this utility model inserted into the first insertion hole;

[0024] Figure 5 This is a schematic diagram of the side cross-section structure of the first side plate of this utility model;

[0025] Figure 6 This is a partial structural diagram of the first side plate and the anti-detachment component of this utility model;

[0026] Figure 7 This is a schematic diagram of the rear view, rear door cross-section, and column cross-section of this utility model;

[0027] Figure 8 This is a schematic diagram of a portion of the rear door and the third insertion rod structure of this utility model;

[0028] Figure 9 This is a schematic diagram of the rear door of the carriage of this utility model in the state of tilting backward to discharge materials;

[0029] Figure 10 This is a schematic diagram of the rear door of this utility model in the state of downward contact with the ground.

[0030] Explanation of icon numbers:

[0031] 1. Base plate; 2. First side plate; 2a. First insertion hole; 2b. First receiving hole; 2c. Through hole; 3. Second side plate; 4. Post; 4a. Insertion hole; 5. Rear door; 5a. Second receiving hole; 5b. Third receiving hole; 5c. First slide groove; 5d. Fourth receiving hole; 5e. Second slide groove; 6. Support plate; 7. First insertion rod; 7a. First slot; 8. Second insertion rod; 9. Spring; 10. First lever; 11. Lever plate; 12. Positioning block; 12a. Second slot; 13. Extension plate; 14. Hydraulic cylinder; 15. Third insertion rod; 16. Second lever; 17. Fourth insertion rod; 18. Third lever; 19. Baffle.

[0032] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0035] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0038] This utility model proposes a multifunctional semi-trailer cargo box rear door structure.

[0039] Please refer to Figures 1 to 10 The structure of the rear door 5 of the multi-functional semi-trailer includes a rectangular base plate 1 arranged horizontally. Two first side plates 2 are vertically symmetrically arranged on both sides of the base plate 1 in the length direction. A second side plate 3 is vertically arranged on the left side of the base plate 1 in the width direction. The two first side plates 2 and the second side plates 3 cooperate to form a C-shaped structure. A support plate 6 is horizontally arranged on the right side of the base plate 1 in the width direction. Two pillars are symmetrically rotatably connected on both sides of the support plate 6. The distribution direction of the two pillars is the same as the distribution direction of the two first side plates 2. The two pillars cooperate to form a door frame.

[0040] Each of the aforementioned pillars is correspondingly installed on the side of the first side plate 2 away from the second side plate 3. The end of each of the aforementioned pillars away from the support plate 6 is detachably connected to the side of the first side plate 2 away from the second side plate 3. A rear door 5 is rotatably connected between the two aforementioned pillars.

[0041] In this invention, the pillar is detachably connected to the first side plate 2, allowing the entire door frame pillar 4 to be opened / removed outwards, completely eliminating the lateral obstruction of the rear of the vehicle by the traditional fixed door frame. When transporting extra-wide equipment (such as wind turbine blades), an unobstructed through-hole 2c can be formed without disassembling any components, saving disassembly / installation time. It also avoids structural damage caused by repeated disassembly of the door frame. Opening the pillar releases the effective width of the vehicle, preventing the pillar 4 from encroaching on the space of a standard container / pallet. During transport, the pillar is fixed to the first side plate 2, ensuring driving safety.

[0042] Please refer to the appendix. Figure 2-5 Each of the first side plates 2 has a first insertion hole 4a2a formed by a transverse recess on the side opposite to the second side plate 3. Each of the support columns has a first insertion rod 7 for insertion into the insertion hole 4a on the side near the first side plate 2. The first insertion hole 4a2a is provided with an anti-detachment component to prevent the first insertion rod 7 from disengaging from the first insertion hole 4a2a. The insertion rod-insertion hole 4a structure enables one-click connection / disconnection between the support column and the vehicle body, which is more efficient than traditional bolts. The anti-detachment component ensures a secure connection during operation and prevents accidental disengagement.

[0043] Please refer to the appendix. Figure 2-3 A first receiving hole 2b is vertically recessed on the lower wall of the first insertion hole 4a2a. The anti-dislodgement component includes a second insertion rod 8 slidably disposed within the first receiving hole 2b. A first slot 7a is recessed on the first insertion rod 7 for inserting the second insertion rod 8. One end of the second insertion rod 8 near the bottom of the first receiving hole 2b is connected to the first receiving hole 2b via a spring 9. The spring 9 is used to push the end of the second insertion rod 8 away from the bottom of the first receiving hole 2b out of the first receiving hole 2b. The spring 9 pushes the second insertion rod 8 into the first slot 7a, achieving self-locking upon insertion and simplifying the operation. The spring 9 cushions and reduces the risk of loosening caused by bumps, improving reliability.

[0044] Please refer to the appendix. Figure 4-5A rectangular through-hole 2c, penetrating the outer wall of the first side plate 2, is formed laterally on the side wall of the first receiving hole 2b. A first lever 10 is laterally slidable within the through-hole 2c. The sliding direction of the first lever 10 is the same as the sliding direction of the second insertion rod 8. One end of the first lever 10 extends into the first receiving hole 2b and is connected to the second insertion rod 8. The other end of the first lever 10, facing away from the second insertion rod 8, extends out of the through-hole 2c and is connected to a lever plate 11. By manually pulling down the lever plate 11, the second insertion rod 8 is moved towards the bottom of the first receiving hole 2b via the first lever 10, so that the second insertion rod 8 disengages from the first insertion rod 7, allowing the first insertion rod 7 to disengage from the first insertion hole 4a2a. The second insertion rod 8 is retracted manually by the exposed lever plate 11, enabling quick unlocking by hand (without tools), meeting the improvement needs of the prior art's "cumbersome operation". The external design of the lever plate 11 facilitates the operator's application of force.

[0045] Please refer to the appendix. Figure 6 The anti-detachment component further includes a positioning component to prevent the second insertion rod 8 from retracting into the first receiving hole 2b after it extends out of the first receiving hole 2b. The positioning component prevents the second insertion rod 8 from accidentally retracting (e.g., in a vibration scenario), thus preventing the door frame from accidentally opening while driving and enhancing safety.

[0046] Please refer to the appendix. Figure 6 The positioning component includes a positioning block 12 disposed on the same side as the dial plate 11. The positioning block 12 is slidably disposed on the outer wall of the first side plate 2. The sliding direction of the positioning block 12 is perpendicular to the sliding direction of the second insertion rod 8. The positioning block is located on one side of the dial plate 11 when the second insertion rod 8 extends out of the first receiving hole 2b. The side of the positioning block near the dial plate 11 has a recessed second slot 12a for the side of the dial plate 11 to be inserted. After the dial plate 11 is inserted into the slot of the positioning block 12, a mechanical interlock is formed, clearly indicating the "locked state". Once the dial plate 11 is fixed, it cannot be accidentally moved, avoiding misoperation.

[0047] Please refer to the appendix. Figure 6 The slot has a magnet at its bottom, and the dial 11 is made of a metal material that allows the magnet to attract it. Magnetic attraction helps the dial 11 automatically embed into the slot, reducing alignment difficulty and improving operational smoothness. The magnet enhances positioning stability, adapting to driving environments.

[0048] Please refer to the appendix. Figure 7The upper side of the rear door 5 has a recessed second receiving hole 5a. An extension plate 13 is slidably disposed within the second receiving hole 5a. At least one hydraulic cylinder 14 is provided on the side of the extension plate 13 near the bottom of the second receiving hole 5a, for moving the extension plate 13 toward or away from the bottom of the second receiving hole 5a. When the rear door 5 flips toward the side closer to the ground, the hydraulic cylinder 14 drives the extension plate 13 to extend out of the second receiving hole 5a, so that the extension plate 13 contacts the ground, thus bridging the gap and facilitating the movement of personnel into the carriage.

[0049] The hydraulically driven extension plate 13 forms an adaptive ramp, solving the problem of the height difference between the ground and the truck bed (the background technology is not explicitly described but is crucial). The hydraulic cylinder 14 replaces manual bridging, facilitating forklift / personnel access and improving the loading and unloading efficiency of heavy-duty equipment.

[0050] Please refer to the appendix. Figure 7-10 The rear door 5 has a third receiving hole 5b recessed on the upper sides of the two pillars 4 and the lower sides of the two pillars 4 respectively; the rear door 5 has two third receiving holes 5b on each side, one on the top and one on the bottom.

[0051] Each of the third receiving holes 5b is arranged laterally toward the adjacent column 4. A third insert rod 15 is slidably provided in the third receiving hole 5b. Each column 4 has a transverse recess on the side near the rear door 5 to form an insertion hole 4a for inserting the third insert rod 15. A first sliding groove 5c extending to the outer wall of the rear door 5 is formed through the side wall of the third receiving hole 5b. A second lever 16 is slidably provided in the first sliding groove 5c. One end of the second lever 16 extends into the third receiving hole and connects with the third insert rod 15, and the other end extends out of the first sliding groove 5c. The sliding direction of the second lever 16 is the same as the sliding direction of the third insert rod 15.

[0052] The third insert rods 15 in the third receiving holes 5b on both sides above the rear door 5 are on the same axis, and the third insert rods 15 in the third receiving holes 5b on both sides below the rear door 5 are on the same axis.

[0053] A fourth receiving hole 5d is recessed on the wall of the first sliding groove 5c. A fourth insert rod 17 is slidably disposed in the fourth receiving hole 5d. The extension direction of the fourth receiving hole 5d is perpendicular to the extension direction of the third receiving hole 5b. The fourth receiving hole 5d is located above the third receiving hole 5b. A second sliding groove 5e is formed through the side wall of the fourth receiving hole 5d, extending to the outer wall of the rear door 5. A third lever 18 is slidably disposed in the second sliding groove 5e. One end of the third lever 18 extends into the fourth receiving hole and is connected to the fourth insert rod 17, and the other end extends out of the second sliding groove 5e. Move the second lever 16 to insert the third insert 15 into the socket 4a, so that the rear door 5 is connected to the column 4. Pull the third lever 18 to insert the fourth insert 17 into the first slide groove 5c. The fourth insert 17 blocks the second lever 16 to prevent the third insert 15 from sliding into the third receiving hole 5b. Conversely, the third insert 17 can be disengaged from the socket 4a, so that the rear door 5 is separated from the column 4.

[0054] Insert the two third rods 15 above the rear door 5 into the corresponding holes 4a, and retract the two third rods 15 below the rear door 5 into the third receiving hole 5b, so that the two sides above the rear door 5 rotate and connect between the two pillars 4, so as to realize the tilting and dumping of materials in the car body, which is convenient for unloading bulk cargo (such as sand and gravel) from the tilted car body.

[0055] The two third inserts 15 below the rear door 5 are inserted into the corresponding holes 4a, and the two third inserts 15 above the rear door 5 retract into the third receiving hole 5b, causing the two sides below the rear door 5 to rotate and connect between the two columns 4, so that the rear door 5 flips towards the ground on the side away from the bottom plate 1 until the upper side of the rear door 5 touches the ground, forming a loading and unloading ramp with the extension plate 13. This enables multiple loading and unloading modes.

[0056] Please refer to the appendix. Figure 4 and 7 The second insertion rod 8 has an arc-shaped inclined surface at one end facing away from the bottom of the first receiving hole 2b, which slopes towards the bottom of the first insertion hole 4a2a. The opening of the insertion hole 4a is arc-shaped, and the end of the third insertion rod 15 facing away from the bottom of the third receiving hole 5b is a pointed tip. Baffles 19 are respectively distributed on the sides of the two columns 4 that are close to each other. After the rear door 5 contacts the baffle 19, the third insertion rod 15 can be inserted precisely into the insertion hole 4a. The arc-shaped inclined surface of the second insertion rod 8 guides the insertion rod to automatically slide into the insertion hole 4a, reducing the alignment accuracy requirement. The pointed tip of the third insertion rod 15 cooperates with the arc-shaped opening of the column 4, assisting in smooth insertion. The baffle 19 acts as a physical limiter, ensuring that the insertion rod and the insertion hole 4a are automatically aligned when the rear door 5 is closed, improving operational reliability.

[0057] The specific operation method of this utility model is as follows:

[0058] I. Conventional Transportation Mode

[0059] Reset the hinge joints between the bottom ends of the two pillars (door frame) and the support plate 6, and insert the first insertion rod 7 at the top into the first insertion hole 4a2a of the first side plate 2. The second insertion rod 8 springs into the slot of the first insertion rod 7 under the action of the spring 9, completing the locking. Push the lever 11 down into the second slot 12a of the positioning block 12, and fix it magnetically to prevent vibration from causing unlocking. Rotate the rear door 5 to fit against the pillars and push the second levers 16 on both sides: the upper second lever 16 drives the upper third insertion rod 15 to insert into the insertion hole 4a of the pillar 4; the lower second lever 16 drives the lower third insertion rod 15 to insert into the insertion hole 4a of the pillar 4. Move the third lever 18 to push the fourth insertion rod 17 into the first slide groove 5c, locking the second lever 16. When the rear door 5 contacts the baffle 19 of the pillar 4, the insertion rod automatically aligns with the insertion hole 4a.

[0060] II. Loading and unloading mode for extra-wide cargo (door frame opening)

[0061] Move the positioning block 12 upwards to release the magnetic attraction and release the lever 11. Pull the lever 11 downwards to drive the second insertion rod 8 to compress the spring 9 and disengage it from the first slot 7a. Rotate the support column outwards to a horizontal position, disengaging it from the first insertion hole 4a2a, forming a through hole 2c without a support column 4.

[0062] III. Bulk Material Disposal Mode

[0063] The door frame remains fixed (the support pillar is locked). Move the lower third lever 18 → retract the fourth insert lever 17 → pull back the lower second lever 16 → the lower third insert lever 15 exits the insertion hole 4a. Keep the upper insert lever of the rear door 5 locked (the upper second lever 16 is fixed).

[0064] The front of the truck bed is hydraulically lifted, and the rear door 5 flips upward under gravity, forming a top opening. Bulk materials (such as sand and gravel) are then poured out from the rear of the truck bed.

[0065] IV. Bridge Ramp Mode

[0066] The door frame remains fixed (support locked). Operate the upper third lever 18 and second lever 16 → retract the upper third insert lever 15. Keep the lower insert lever of the rear door 5 locked (lower second lever 16 fixed). Flip the rear door 5 downwards to the ground, the rear door 5 becomes a ramp. Activate the hydraulic cylinder 14 → the extension plate 13 extends from the second receiving hole 5a → contacts the ground to form a continuous ramp. Forklifts / personnel enter the compartment along the ramp to transport goods.

[0067] V. Reset Operation

[0068] Retract extension plate 13: Hydraulic cylinder 14 retracts extension plate 13 into the second receiving hole 5a. Lift rear door 5 and lock the upper and lower insertion rods as needed (all need to be locked in normal mode). Rotate the support column to the vertical position → insert the first insertion rod 7 into the first insertion hole 4a2a → automatic locking → magnetic fixation by the lever 11.

[0069] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A multi-functional semi-trailer cargo box rear door structure, characterized in that, The system includes a rectangular base plate arranged horizontally, two first side plates arranged vertically symmetrically on both sides of the base plate along its length, and a second side plate arranged vertically on the left side of the base plate along its width. The two first side plates and the second side plate cooperate to form a C-shaped structure. A support plate is arranged horizontally on the right side of the base plate along its width. Two pillars are symmetrically and rotatably connected to both sides of the support plate. The distribution direction of the two pillars is the same as the distribution direction of the two first side plates. The two pillars cooperate to form a door frame. Each of the aforementioned pillars is correspondingly installed on the side of the first side plate away from the second side plate. The end of each pillar away from the support plate is detachably connected to the side of the first side plate away from the second side plate. A rear door is rotatably connected between the two pillars.

2. The multi-functional semi-trailer cargo box rear door structure according to claim 1, characterized in that, Each of the first side plates has a first insertion hole formed by a lateral recess on the side opposite to the second side plate. Each of the support columns has a first insertion rod for insertion into the insertion hole on the side near the first side plate. The first insertion hole is provided with an anti-dislodgement component to prevent the first insertion rod from dislodging from the first insertion hole.

3. The multi-functional semi-trailer cargo box rear door structure according to claim 2, characterized in that, A first receiving hole is formed by a vertical recess on the lower wall of the first insertion hole. The anti-dislodgement component includes a second insertion rod that is slidably disposed in the first receiving hole. A first slot for inserting the second insertion rod is formed by a recess on the first insertion rod. One end of the second insertion rod near the bottom of the first receiving hole is connected to the first receiving hole by a spring. The spring is used to push the end of the second insertion rod away from the bottom of the first receiving hole out of the first receiving hole.

4. The multi-functional semi-trailer cargo box rear door structure according to claim 3, characterized in that, The first receiving hole has a rectangular through hole formed laterally through the outer wall of the first side plate. A first lever is slidably disposed in the through hole. The sliding direction of the first lever is the same as the sliding direction of the second insert. One end of the first lever extends into the first receiving hole and is connected to the second insert. The end of the first lever away from the second insert extends out of the through hole and is connected to the lever plate.

5. The multi-functional semi-trailer cargo box rear door structure according to claim 4, characterized in that, The anti-detachment component also includes a positioning component for preventing the second insertion rod from retracting into the first receiving hole after the second insertion rod extends out of the first receiving hole.

6. The multi-functional semi-trailer cargo box rear door structure according to claim 5, characterized in that, The positioning component includes a positioning block disposed on the same side as the dial plate. The positioning block is slidably disposed on the outer wall of the first side plate. The sliding direction of the positioning block is perpendicular to the sliding direction of the second insertion rod. The positioning block is located on one side of the dial plate when the second insertion rod extends out of the first receiving hole. The side of the positioning block near the dial plate has a recessed second slot for the side of the dial plate to be inserted.

7. The multi-functional semi-trailer cargo box rear door structure according to claim 6, characterized in that, The slot has a magnet at the bottom, and the dial is made of a metal material that allows the magnet to be attracted.

8. The multi-functional semi-trailer cargo box rear door structure according to claim 7, characterized in that, The upper side of the rear door has a recessed second receiving hole, and an extension plate is slidably provided in the second receiving hole. The extension plate is provided with at least one hydraulic cylinder on the side near the bottom of the second receiving hole, which is used to drive the extension plate to move toward or away from the bottom of the second receiving hole.

9. The multi-functional semi-trailer cargo box rear door structure according to claim 8, characterized in that, The rear door has a third receiving hole recessed on both sides above the two pillars and on both sides below the two pillars; there are two third receiving holes on each side of the rear door, one on the top and one on the bottom. Each of the third receiving holes is arranged laterally toward the adjacent pillar. A third insert rod is slidably provided in the third receiving hole. Each pillar has a horizontal recess on the side near the rear door to form an insertion hole for inserting the third insert rod. A first sliding groove extending to the outer wall of the rear door is formed through the side wall of the third receiving hole. A second lever is slidably provided in the first sliding groove. One end of the second lever extends into the third receiving hole and is connected to the third insert rod, and the other end extends out of the first sliding groove. The sliding direction of the second lever is the same as the sliding direction of the third insert rod. The third inserts in the third receiving holes on both sides above the rear door are on the same axis, and the third inserts in the third receiving holes on both sides below the rear door are on the same axis. A fourth receiving hole is recessed on the wall of the first sliding groove. A fourth insert rod is slidably disposed in the fourth receiving hole. The extension direction of the fourth receiving hole is perpendicular to the extension direction of the third receiving hole. The fourth receiving hole is located above the third receiving hole. A second sliding groove extending to the outer wall of the rear door is formed through the side wall of the fourth receiving hole. A third lever is slidably disposed in the second sliding groove. One end of the third lever extends into the fourth receiving hole and is connected to the fourth insert rod, while the other end extends out of the second sliding groove.

10. The multifunctional semi-trailer cargo box rear door structure according to claim 9, characterized in that, The end of the second insertion rod away from the bottom of the first receiving hole is an arc-shaped slope that slopes towards the bottom of the first insertion hole; the opening of the insertion hole is arc-shaped, and the end of the third insertion rod away from the bottom of the third receiving hole is a pointed tip; baffles are respectively provided on the side of the two columns that are close to each other, and the third insertion rod can be inserted into the insertion hole after the rear door contacts the baffle.

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