Commercial light truck cargo bed

Abstract

This invention provides a commercial light truck cargo box, including a cargo box body, which includes a top plate, a bottom plate, a front plate, a rear door, and two side plates. A side door, hinged to the bottom plate, is provided on one of the side plates of the cargo box body. An opening mechanism is also provided inside the cargo box body to control the opening of the side door; the opening mechanism is fixed to the side of the side door near the top plate. A cargo discharge mechanism is provided to empty the cargo inside the cargo box body near the side door; the cargo discharge mechanism is located inside the cargo box body and fixed to the side of the side door near the bottom plate. A limiting mechanism is provided to control the timing of the side door tilting away from the other side plate; the limiting mechanism is located on the front plate near the top plate and the side door. This invention can discharge the cargo near the side door from the cargo box when a fire breaks out, allowing firefighters to accurately and quickly extinguish fires deep inside the cargo.

Description

Technical Field

[0001] This invention belongs to the field of commercial vehicle technology, specifically relating to a commercial light truck cargo box. Background Technology

[0002] Existing trucks generally consist of a cab at the front and a cargo box at the rear. The cargo box is used to load a variety of goods, and its existence has greatly improved the convenience of life and production.

[0003] Existing trucks typically consist of a roof, floor, front panel, tailgate, and side panels forming an enclosed space for placing goods. When trucks are carrying goods, due to the enclosed nature of the cargo compartment and the variety of goods, the goods inside the cargo compartment are prone to catching fire in hot weather. Usually, when a fire breaks out, there is no large fire-fighting equipment available to carry out timely rescue operations.

[0004] For such cargo compartment fires, the current rescue method is generally to open the rear door of the cargo compartment, enter the cargo compartment, pry open the cargo, and then extinguish the fire. However, when cargo catches fire inside a truck, it is usually a point fire source inside the cargo. By the time the driver discovers it, the temperature inside the cargo compartment is already high, making it impossible for the driver to enter the cargo compartment to extinguish the fire. This results in the driver being able to only watch the cargo burn, which not only leads to damage to the cargo and the vehicle, but also easily obstructs traffic and may even endanger the personal safety of the driver. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a commercial light truck cargo box to solve the problem in the prior art that when the cargo inside the cargo box catches fire, the fire source cannot be extinguished in time, resulting in damage to the cargo and the vehicle.

[0006] The commercial light truck cargo box proposed in this invention includes a cargo box body, which includes a top plate, a bottom plate, a front plate, a tailgate, and two side plates. A side door hinged to the bottom plate is provided on one of the side plates of the cargo box body. The cargo box body also includes:

[0007] An opening mechanism is used to control the opening of the side door, and the opening mechanism is fixed on the side of the side door near the top plate;

[0008] A cargo discharge mechanism is used to empty the cargo inside the cargo box body near the side door. The cargo discharge mechanism is located inside the cargo box body and is fixed on the side of the side door near the bottom plate.

[0009] A limiting mechanism is provided to control the timing of the side door tilting away from the other side panel, the limiting mechanism being located on the front panel near the top panel and the side door.

[0010] Optionally, the opening mechanism includes a limiting plate and an opening unit. The limiting plate is fixed on the inner wall of the side door near the top plate. The limiting plate has several insertion holes, and the opening unit is connected to the limiting plate through the several insertion holes.

[0011] Optionally, the opening unit includes a connecting plate, and the connecting plate is provided with a plurality of insert rods on the side near the side door that correspond to a plurality of insert holes on the limiting plate. The insert rods are inserted into the corresponding insert holes to realize the connection between the limiting plate and the opening unit. When the limiting plate is connected to the opening unit, the side door is in a closed state.

[0012] Several expansion cylinders are fixed on the inner wall of the top plate near the side door. Each expansion cylinder contains a first spring and a push rod. One end of the first spring is fixed to the bottom of the inner wall of the expansion cylinder, and the other end of the first spring is fixedly connected to the end of the push rod near the top plate. The end of the push rod away from the top plate is fixed to the side of the connecting plate away from the side door. Liquid is filled between the end of the push rod near the top plate and the top of the inner wall of the expansion cylinder.

[0013] Optionally, the force required for the first spring to deform is greater than the sum of the weights of the push rod, the connecting plate, and the insert rod.

[0014] Optionally, the cargo box body is further provided with a number of electric push rods for pushing the opening unit away from the limiting plate to realize the opening of the side door. The electric push rods are fixed on the inner wall of the top plate near the side door, and the end of the electric push rod away from the top plate is hinged to the connecting plate.

[0015] Optionally, the cargo discharge mechanism includes a cargo discharge plate, which is disposed on the bottom plate of the cargo box body on the side near the side door. A cargo discharge unit is hinged to the side of the cargo discharge plate near the side door, and the cargo discharge plate is linked to the side door through the cargo discharge unit.

[0016] Optionally, the cargo discharge unit includes a pull rod, which is hinged to the cargo discharge plate;

[0017] The impact frame is fixedly installed on the inner wall of the side door near the front panel. One end of the impact frame is fixedly connected to the impact frame, and the other end of the second spring is fixedly connected to the end of the pull rod away from the cargo tray.

[0018] Optionally, the limiting mechanism includes an air hole that penetrates the front panel and the side door, allowing the outer wall of the front panel to communicate with the outer wall of the side door. A limiting unit is provided within the air hole. The limiting unit includes a movable limiting cylinder with a threaded rod passing through it. The middle portion of the limiting cylinder near the front panel is threadedly connected to the threaded rod. A fan blade is fixedly connected to the end of the threaded rod near the front panel. A fixing ring is fitted onto the threaded rod between the fan blade and the limiting cylinder. A spring is installed on the contact surface between the fixing ring and the threaded rod. The fixing ring is fixedly connected to the inner wall of the air hole via a fixing post.

[0019] Optionally, the length of the limiting insert is greater than the length of the air hole located inside the side door.

[0020] Optionally, a counterweight is embedded on the outer wall of the side door near the top plate, and a fire detector is installed inside the cargo compartment.

[0021] Compared with the prior art, the advantages of the commercial light truck cargo box shown in this invention are as follows:

[0022] 1. By opening an automatically opening side door on the side panel of the cargo box, the driving personnel can open the side door to put out the fire when they discover that the cargo is on fire. Moreover, when the cargo box is on fire, they are not limited to opening the rear door of the cargo box to enter the cargo box to put out the fire. This gives the driving personnel a larger rescue area and greatly improves their firefighting efficiency.

[0023] 2. By installing an opening mechanism in the cargo box body that can control the opening of the side door in time when the cargo catches fire, the cargo box can open the side door in time when the fire detector fails or the fire is too large, ensuring the performance of the cargo box side door when the cargo catches fire and improving the stability and safety of the commercial light truck cargo box of the present invention during use.

[0024] 3. By installing a limiting mechanism inside the cargo box to control the timing of the side door tilting outward, it is ensured that the side door will only open after the vehicle has come to a complete stop when a fire breaks out inside the cargo box, thus preventing the side door from opening immediately when the cargo catches fire while the vehicle is in motion and causing a safety accident, so that the driving personnel can choose a suitable location and time to put out the fire.

[0025] 4. By installing a cargo discharge mechanism that is linked to the side door inside the cargo compartment, the cargo discharge mechanism is activated when the side door is opened, causing the goods near the side door to tip over, thereby exposing the fire source inside the cargo compartment, so that firefighters can carry out precise and rapid firefighting, greatly reducing the damage to goods and vehicles. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of a commercial light truck cargo box according to the present invention;

[0027] Figure 2This is a schematic diagram of the structure of the internal side door of the commercial light truck cargo compartment according to the present invention;

[0028] Figure 3 This is a cross-sectional structural diagram of the opening mechanism of the cargo box body of the present invention;

[0029] Figure 4 For the present invention Figure 3 Enlarged schematic diagram of the structure at point A in the middle

[0030] Figure 5 This is a schematic diagram of the outer side of the limiting mechanism of the cargo box body of the present invention;

[0031] Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure at point B;

[0032] Figure 7 This is a cross-sectional structural diagram of the limiting mechanism of the cargo box body of the present invention;

[0033] Figure 8 For the present invention Figure 7 Enlarged schematic diagram of the structure at point C;

[0034] Figure 9 This is a schematic diagram of the cargo discharge mechanism inside the cargo box body of the present invention;

[0035] Figure 10 For the present invention Figure 9 An enlarged schematic diagram of the structure at point D.

[0036] The above-mentioned attached drawings include the following reference numerals: 10-Cargo box body; 11-Top plate; 12-Bottom plate; 13-Front plate; 14-Side plate; 20-Side door; 21-Counterweight block; 30-Opening mechanism; 31-Limiting plate; 311-Insertion hole; 32-Opening unit; 321-Connecting plate; 322-Insertion rod; 323-Expansion cylinder; 324-First spring; 325-Push rod; 40-Limiting mechanism; 41-Air hole; 42-Limiting unit; 421-Limiting insert; 422-Threaded rod; 423-Fixing ring; 424-Fan blade; 425-Curled spring; 426-Fixing post; 50-Discharging mechanism; 51-Discharging plate; 52-Discharging unit; 521-Pull rod; 522-Impact frame; 523-Second spring; 60-Fire detector; 70-Electric push rod.

[0037] The following detailed embodiments will be further described in conjunction with the above-mentioned accompanying drawings. Detailed Implementation

[0038] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0039] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0041] like Figure 1-10 As shown, the commercial light truck cargo box of the present invention includes a cargo box body 10, the cargo box body 10 includes a top plate 11, a bottom plate 12, a front plate 13, a tailgate (not shown) and two side plates 14. A side door 20 is provided on one side plate 14 of the cargo box body 10 and is hinged to the bottom plate 12. An opening mechanism 30 is fixedly provided on the side of the side door 20 near the top plate 11. A limiting mechanism 40 is provided on the side of the side door 20 near the top plate 11 and the front plate 13. At the same time, a cargo discharge mechanism 50 is provided on the side of the side door 20 near the bottom plate 12 and the front plate 13 and is linked to the side door 20.

[0042] In this embodiment, an installation window for installing a side door 20 is provided on the right side panel of the cargo box body 10. The side of the side door 20 near the bottom plate 12 is hinged to the bottom plate 12. A counterweight 21 is embedded on the outer wall of the side of the side door 20 near the top plate 11. When the side door 20 is opened, the side door 20 tilts away from the left side panel due to the gravity of the counterweight 21, that is, it tilts outward and eventually contacts the ground to form a ramp that facilitates the entry of drivers into the cargo box.

[0043] As an example, the opening mechanism 30 is used to control the opening of the side door 20, fixing and limiting the side door 20 to prevent it from tipping outwards due to the weight of the counterweight 21 and causing a traffic accident. In this embodiment, as... Figure 3-4As shown, the opening mechanism 30 includes a limiting plate 31 and an opening unit 32. The limiting plate 31 is fixedly installed on the inner wall of the side door 20 near the top plate 11, and has several insertion holes 311 for connecting with the opening unit 32. The opening unit 32 includes a connecting plate 321 that connects with the limiting plate 31. Specifically, several insertion rods 322 corresponding to the insertion holes 311 on the limiting plate 31 are fixedly connected to the side of the connecting plate 321 near the side door 20. The insertion rods 322 are inserted into the corresponding insertion holes 311, that is, the connecting plate 321 and the limiting plate 31 are connected together, thereby realizing the connection between the limiting plate 31 and the opening unit 32. When the limiting plate 31 and the opening unit 32 are connected, the side door 20 is in a closed state, thereby realizing the fixing and limiting of the side door 20 by the opening mechanism 30.

[0044] Furthermore, the opening unit 32 also includes a plurality of expansion cylinders 323 for releasing the connection between the connecting plate 321 and the limiting plate 31. The plurality of expansion cylinders 323 are fixedly mounted on the inner wall of the top plate 11 near the side door 20. The expansion cylinders 323 are provided with a first spring 324 and a push rod 325 inside. The lower end of the first spring 324 is fixedly connected to the bottom inner wall of the expansion cylinder 323, and the upper end of the first spring 324 is fixedly connected to the lower surface of the upper end of the push rod 325 near the top plate 11. The lower end of the push rod 325 away from the top plate 11 is fixedly mounted on the side of the connecting plate 321 away from the side door 20. It should be noted that, in this embodiment, the force required for the deformation of the first spring 324 is greater than the sum of the weights of the push rod 325, the connecting plate 321, and the several insert rods 322. In this way, the first spring 324 can support the weights of the push rod 325, the connecting plate 321, and the several insert rods 322, so that the connecting plate 321, which is inserted into the limiting plate 31, will not detach from the limiting plate 31 due to gravity, causing the side door 20 to open erroneously. This ensures the maximum stability of the insertion between the connecting plate 321 and the limiting plate 31.

[0045] Furthermore, in this embodiment, the upper end of the push rod 325 is located in the middle of the inner wall of the expansion cylinder 323. The space between the upper end of the push rod 325 and the top inner wall of the expansion cylinder 323 is filled with a liquid with a low boiling point. When the cargo compartment catches fire, the liquid filled inside the expansion cylinder 323 reaches its boiling point due to the high temperature and rapidly generates gas expansion, thereby pushing the push rod 325 down, causing the connecting plate 321 and the insert rod 322 to move down, so that the insert rod 322 on the connecting plate 321 is pulled out from the insertion hole 311 on the limiting plate 31, releasing the limiting of the opening mechanism 30 on the side door 20, and realizing the opening of the side door 20.

[0046] To enable drivers to promptly detect a fire in the cargo compartment and open the side door 20 for firefighting, the commercial light truck cargo compartment in this embodiment has a fire detector 60 fixedly installed on the inner wall of the top plate 11 of the cargo compartment body 10. Simultaneously, several electric actuators 70 are fixedly connected to the opening mechanism 30. The electric actuators 70 are hinged to the inner wall of the top plate 11 near the side door 20, and the end of the electric actuator 70 away from the top plate 11 is hinged to the side of the connecting plate 321 away from the side door 20. The electric actuators 70 are used to push the opening unit 32 away from the limiting plate 31, thereby opening the side door 20. Specifically, when a fire occurs inside the cargo compartment and smoke is generated, the fire detector 60 detects the fire and issues an audible and visual alarm. Upon receiving the fire information, the drivers promptly activate the electric actuators 70, extending the rod of the electric actuator 70 to push the connecting plate 321 downwards, releasing the connection between the connecting plate 321 and the limiting plate 31, ensuring the timely opening of the side door 20.

[0047] As an example, such as Figure 6-8 As shown, the limiting mechanism 40 is used to control the timing of the side door 20 tilting away from the left side panel. It includes an air hole 41 that penetrates the front panel 13 and the side door 20, allowing the outer wall of the front panel 13 to communicate with the outer wall of the side door 20. In this embodiment, the air hole 41 is an L-shaped hole. The long end of the air hole 41 penetrates the front panel 13 and the right side panel where the side door 20 is located, entering the interior of the side door 20. The short end of the air hole 41 allows communication between the outer wall of the front panel 13 and the outer wall of the side door 20. A limiting unit 42 is provided inside the air hole 41. The limiting unit 42 includes a movable limiting cylinder 421. A threaded rod 422 passes through the limiting cylinder 421, and the middle part of the limiting cylinder 421 near the outer wall of the front panel 13 is threadedly connected to the threaded rod 422. A fan blade 424 is fixedly connected to one end of the threaded rod 422 near the outer wall of the front plate 13. A fixing ring 423 is sleeved on the threaded rod 422 between the fan blade 424 and the limiting insert 421. It should be noted that a spring spring 425 is installed on the contact surface between the fixing ring 423 and the threaded rod 422. At the same time, in order to improve the stability of the fixing ring 423 during use, a fixing post 426 is provided on the periphery of the fixing ring 423. The fixing post 426 is fixedly installed on the inner wall of the air hole 41.

[0048] It should be noted that in this embodiment, the length of the limiting insert 421 is greater than the length of the air hole 41 inside the side door 20. At the same time, the limiting insert 421 can enter or leave the space inside the side door 20 by the rotation of the threaded rod 422, thereby temporarily locking the side door 20 and controlling the timing of the side door 20 opening. This provides more time for drivers to choose a suitable location to put out the fire, and can minimize the risk of the side door 20 opening immediately and tilting outwards when it loses the restriction of the opening mechanism 30, thus preventing traffic accidents.

[0049] As an example, such as Figure 9-10 As shown, the cargo discharge mechanism 50 is used to empty the goods inside the cargo box body 10 near the side door 20. The cargo discharge mechanism 50 is located inside the cargo box body 10. In this embodiment, the cargo discharge mechanism 50 is fixed on the side of the side door 20 near the bottom plate 12 and the tail door, and includes a cargo discharge plate 51, which is disposed on the side of the bottom plate 12 near the side door 20. In some embodiments, a placement groove is provided in the side of the bottom plate 12 near the side door 20, and the cargo discharge plate 51 is placed in the placement groove. A cargo discharge unit 52 is hinged to a corner of the cargo discharge plate 51 near the side door 20 and the tail door, and the cargo discharge plate 51 is linked to the side door 20 through the cargo discharge unit 52.

[0050] Furthermore, the loading unit 52 includes a pull rod 521 hinged to the loading plate 51. An impact bracket 522 is provided at the end of the pull rod 521 away from the bottom plate 12. The impact bracket 522 is fixedly installed on the inner wall of the side door 20 near the bottom plate 12. In this embodiment, as shown in the figure, the impact bracket 522 is a rectangular slot with a downward opening. The pull rod 521 is placed inside the slot. Spring slots are provided on both sides of the impact bracket 522. A transverse connecting block 524, penetrating the spring slots on both sides of the impact bracket 522, is provided at the end of the pull rod 521 away from the bottom plate 12. A second spring 523 is placed in the spring slot of the impact bracket 522. The lower end of the second spring 523, near the bottom plate 12, is fixedly connected to the side of the spring slot near the bottom plate 12. The upper end of the second spring 523, away from the bottom plate 12, is fixedly connected to the lower surface of the connecting block 524 of the pull rod 521. In this way, when the side door 20 tilts outward, the impact bracket 522 is driven to tilt outward, and the connecting block 524 in the slot will move downward relative to the spring slot, thereby squeezing the second spring 523. The second spring 523 deforms and generates a reverse thrust on the connecting block 524 of the pull rod 521, so that the pull rod 521 can drive the lower hinged cargo plate 51 to move.

[0051] In actual operation, the specific operation process of the commercial light truck cargo box of the present invention can be as follows: During driving, the goods inside the cargo box body 10 catch fire, the temperature inside the cargo box rises and smoke is generated, the fire detector 60 located on the inner wall of the top plate 11 detects the fire and triggers an audible and visual alarm, the driver in the cab receives the alarm information and discovers the fire, and then activates the electric push rod 70 to release the opening mechanism 30 from the restriction on the side door 20. Specifically, the rod of the electric push rod 70 extends to push the connecting plate 321 downward. During the downward movement of the connecting plate 321, the insertion rod 322 is pulled out from the insertion hole 311 on the limiting plate 31. At this time, the insertion state between the limiting plate 31 and the connecting plate 321 is released. In other words, the side door 20 is unrestricted and has a tendency to tilt outward.

[0052] It should be noted that the above process involves manual detection and activation of the electric actuator 70 to open the side door. This manual activation also has certain problems. For example, if the fire is large or the fire detector 60 malfunctions, manually activating the electric actuator 70 requires a certain reaction time and may not be able to extinguish the fire in time, thus causing some damage. Therefore, the opening mechanism 30 itself is designed to automatically sense and release the restriction on the side door 20. Specifically, when the cargo inside the cargo compartment catches fire, the internal temperature of the cargo compartment rises. The liquid with a low boiling point filled in the expansion cylinder 323 of the opening mechanism 30 will begin to boil, generating gas expansion, which will push the actuator 325 downward. The first spring 324 will contract, and the downward movement of the actuator 325 will drive the connecting plate 321 downward, causing the actuator 70 to be stretched, forcing the actuator 70 to be activated. Under the dual action, the insertion rod 322 will eventually disengage from the insertion hole 311, releasing the restriction of the opening mechanism 30 on the side door 20. This dual design effectively ensures the usability of the cargo compartment side door in the event of a fire, thereby improving the stability and safety of the commercial light truck cargo compartment during use.

[0053] After the side door 20 is unrestrained: If the vehicle has come to a complete stop, the side door 20 will immediately begin to tilt outward under the weight of the counterweight 21 embedded in its upper outer wall, eventually forming a ramp that facilitates entry of drivers into the cargo compartment. If the vehicle is still moving and has not come to a complete stop due to road conditions or other reasons, the side door 20 will remain temporarily closed due to the presence of the limiting mechanism 40. Specifically, during vehicle movement, the outer wall of the front panel 13 of the cargo compartment body 10 will be blown by airflow, causing the fan blades 424 on the outer wall of the front panel 13 to rotate. Since the fan blades 424 are fixedly connected to the threaded rod 422, the rotation of the fan blades 424 will drive the threaded rod 422 to rotate. During the rotation of the threaded rod 422, the spring spring 425 connected to the fixing ring 423 will gradually tighten.

[0054] Meanwhile, since the limiting insert 421 is threadedly connected to the threaded rod 422, the rotation of the threaded rod 422 will drive the limiting insert 421 to move into the side door 20. In other words, the limiting insert 421 will be inserted into the part of the air hole 41 located inside the side door 20, creating a locking effect on the side door 20. When the vehicle stops, the fan blade 424 will no longer rotate due to the airflow during vehicle movement. The spring 425 located at the connection between the threaded rod 422 and the fixing ring 423 will no longer tighten, but will instead elastically drive the threaded rod 422 to rotate in the opposite direction. The limiting insert 421 will then move in the opposite direction, meaning that the limiting insert 421 gradually withdraws away from the side door 20 and finally returns to the air hole 41 located on the side panel where the side door 20 is located. It will no longer have a locking effect on the side door 20, and the side door 20 will immediately open and tilt outward. In this way, even if the side door 20 loses the restriction of the opening mechanism 30 due to the activation of the electric push rod 70 during driving, the side door 20 will not open immediately and tilt outward to cause a traffic accident, and it can provide the driver with more time to choose when to fight the fire and park safely on the ground.

[0055] As the vehicle comes to a complete stop, the side door 20 opens and tilts outward. During this process, the side door 20 moves the impact frame 522 synchronously. The transverse connecting block of the pull rod 521 moves relative to the spring groove, squeezing the second spring 523. As the side door 20 tilts, it is affected by the acceleration due to gravity, and its speed increases. Finally, the connecting block quickly contacts the inner wall of the lower end of the spring groove. The impact frame 522 and the connecting block of the pull rod 521 collide. The instantaneous impact force generated during the collision will push the pull rod 521 in the opposite direction. Finally, the pull rod 521 will pull up the cargo tray 51 and move it. The goods piled on the cargo tray 51 will be moved outward and tilted, exposing the fire source inside the cargo compartment, which will facilitate the precise and rapid firefighting by firefighters.

[0056] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0057] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A commercial light truck cargo box, comprising a cargo box body, said cargo box body including a top plate, a bottom plate, a front plate, a tailgate, and two side plates, characterized in that, A side door hinged to the floor plate is provided on one side panel of the cargo box body, and the cargo box body also includes: An opening mechanism is used to control the opening of the side door, and the opening mechanism is fixed on the side of the side door near the top plate; A cargo discharge mechanism is used to empty the cargo inside the cargo box body near the side door. The cargo discharge mechanism is located inside the cargo box body and is fixed on the side of the side door near the bottom plate. A limiting mechanism is provided to control the timing of the side door tilting away from the other side panel, the limiting mechanism being located on the front panel near the top panel and the side door; The opening mechanism includes a limiting plate and an opening unit. The limiting plate is fixed on the inner wall of the side door near the top plate. The limiting plate has several holes, and the opening unit is connected to the limiting plate through the several holes. The opening unit includes a connecting plate and several expansion cylinders. The connecting plate has several insertion rods on its side near the side door, corresponding to several insertion holes on the limiting plate. The insertion rods are inserted into the corresponding insertion holes to connect the limiting plate to the opening unit. When the limiting plate is connected to the opening unit, the side door is in a closed state. The expansion cylinders are fixed to the inner wall of the top plate near the side door. The expansion cylinders contain a first spring and a push rod. One end of the first spring is fixed to the bottom of the inner wall of the expansion cylinder, and the other end of the first spring is fixedly connected to the end of the push rod near the top plate. The end of the push rod away from the top plate is fixed to the connecting plate on the side away from the side door. Liquid is filled between the end of the push rod near the top plate and the top of the inner wall of the expansion cylinder. When a fire breaks out inside the cargo compartment, the liquid inside the expansion cylinder generates gas at high temperature and expands, thereby pushing the push rod downward, which in turn moves the connecting plate and the insert rod downward, causing the insert rod on the connecting plate to be pulled out from the insertion hole on the limiting plate, releasing the opening mechanism from the limiting of the side door, and realizing the opening of the side door; The cargo box body is also provided with several electric push rods, which are used to push the opening unit away from the limiting plate to realize the opening of the side door. The electric push rods are fixed on the inner wall of the top plate near the side door, and the end of the electric push rod away from the top plate is hinged to the connecting plate. The cargo discharge mechanism includes a cargo discharge plate, which is disposed on the bottom plate of the cargo box body near the side door. A cargo discharge unit is hinged to the side of the cargo discharge plate near the side door, and the cargo discharge plate is linked to the side door through the cargo discharge unit.

2. The commercial light truck cargo box according to claim 1, characterized in that, The force required for the first spring to deform is greater than the sum of the weights of the push rod, the connecting plate, and the insert rod.

3. The commercial light truck cargo box according to claim 1, characterized in that, The sorting unit includes: A pull rod, which is hinged to the cargo tray; The impact frame is fixedly installed on the inner wall of the side door near the front panel. One end of the impact frame is fixedly connected to the impact frame, and the other end of the second spring is fixedly connected to the end of the pull rod away from the cargo tray.

4. The commercial light truck cargo box according to claim 1, characterized in that, The limiting mechanism includes an air hole that penetrates the front panel and the side door, allowing the outer wall of the front panel to communicate with the outer wall of the side door. A limiting unit is provided within the air hole. The limiting unit includes a movable limiting cylinder with a threaded rod passing through it. The middle part of the limiting cylinder near the front panel is threadedly connected to the threaded rod. A fan blade is fixedly connected to the end of the threaded rod near the front panel. A fixing ring is fitted onto the threaded rod between the fan blade and the limiting cylinder. A spring is installed on the contact surface between the fixing ring and the threaded rod. The fixing ring is fixedly connected to the inner wall of the air hole via a fixing post.

5. The commercial light truck cargo box according to claim 4, characterized in that, The length of the limiting insert is greater than the length of the air hole located inside the side door.

6. The commercial light truck cargo box according to claim 1, characterized in that, A counterweight is embedded on the outer wall of the side door near the top plate, and a fire detector is also installed inside the cargo compartment.

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