Rotational molding transport case

Abstract

The invention relates to the technical field of rotational molding boxes, and particularly discloses a rotational molding transport box which comprises a box body, a box door and a supporting and locking mechanism, the supporting and locking mechanism comprises a supporting block, a sliding block, an elastic piece, a connecting rod and a transmission piece, a sliding groove and a mounting groove are formed in the box body, the supporting block is slidably mounted in the sliding groove, and the sliding block is slidably mounted in the mounting groove; a fixing groove is formed in the inner side of the box door, the elastic piece is connected between the sliding block and a fixing point of the box body, the two ends of the connecting rod are hinged to the supporting block and the sliding block respectively, and the transmission piece is used for driving the sliding block to move during hoisting so as to push the supporting block to be inserted into the fixing groove. The supporting and locking mechanism is automatically triggered through pulling force generated during hoisting, the box body and the box door are locked into a whole, deformation of the box body in the hoisting process is effectively prevented, the problem that the box door is stuck or the box body is damaged due to deformation is solved, meanwhile, by means of the force storage buffering effect of the spring, the box door is locked, and the safety is improved. And damage to the universal rollers due to uneven stress when the box body falls to the ground is avoided.

Description

Technical Field

[0001] This invention relates to the field of rotomolded box technology, and specifically to a rotomolded transport box. Background Technology

[0002] In modern logistics, industrial production, and outdoor operations, transport containers serve as the core carriers for cargo storage and transshipment, and their performance directly impacts cargo safety, transportation efficiency, and overall costs. The market demands higher standards for the durability, sealing, impact resistance, and adaptability of transport containers. Traditional transport containers are mostly made using injection molding, blow molding, or metal materials. While injection-molded transport containers offer high production efficiency, their mold structure limits wall thickness, leading to stress concentration at corners and a tendency to crack and deform under long-distance travel or heavy stacking conditions. Blow-molded containers offer better sealing, but their material strength is insufficient, resulting in weak puncture resistance and making them unsuitable for transporting heavy goods or sharp objects. Chinese patent document CN105035455B discloses a large rotomolded packaging box made of PE foam in one piece and its manufacturing process. The box includes a rotomolded packaging box body, a rotomolded packaging box lid, a base bracket, sealing strips, and a snap lock. The shells of the rotomolded packaging box body and the lid are both made of polyethylene. A polyethylene foam layer is filled between the inner and outer layers of the shell of the rotomolded packaging box body and the shell of the rotomolded packaging box lid. The polyethylene foam raw material particles in the polyethylene foam layer have a mesh size of 20-40 mesh, which improves the product's strength, toughness, impact resistance, and thermal insulation performance, ensuring product quality and sustainable production.

[0003] When transporting goods, rotomolded shipping containers require effective protection for the contents. Traditional rotomolded shipping containers are rectangular prisms with open ends, typically hinged doors. During lifting and handling, these containers are hoisted using lifting rings located at the top. However, during hoisting, the bottom of the container is prone to deformation due to the combined tension from the top and the weight of the contents. This can lead to jammed doors, seal failure, or even structural damage. Furthermore, upon landing, uneven ground or tilting can cause excessive localized stress on the bottom rollers, resulting in broken or damaged supports. Summary of the Invention

[0004] This invention provides a rotomolded transport box, which aims to solve the problems in related technologies where the rotomolded transport box is prone to deformation during hoisting, resulting in the box door jamming and being unable to open, sealing failure, or even damage to the box structure; at the same time, the rollers at the bottom of the box may break or be damaged due to excessive local instantaneous force when the box lands.

[0005] A rotomolded transport box includes a box body and box doors hinged to the openings on both sides of the box body. The top of the box body is provided with a lifting ring, and the box body also includes a support and locking mechanism located inside the box body. The support locking mechanism includes a support block, a slider, an elastic element, a connecting rod, and a transmission element. The bottom of the housing is provided with a sliding groove and a mounting groove. The support block is slidably installed in the sliding groove and can move in a direction perpendicular to the housing door. The slider is slidably installed in the mounting groove and can move in a direction parallel to the housing door. The inner side of the housing door is provided with a fixing groove that cooperates with the support block. The elastic element is connected between the slider and the fixing point of the housing to provide a restoring force for the slider. The two ends of the connecting rod are respectively hinged to the support block and the slider. One end of the transmission element is connected to a lifting ring, and the other end is connected to the slider. When the box is hoisted, the lifting ring is lifted by force and drives the slider to overcome the resistance of the elastic element through the transmission component. The slider drives the support block to extend along the slide groove and insert into the fixed groove through the connecting rod to lock the box and the door. When the box is lowered to the ground and the force is released, the elastic element drives the slider to reset, thereby driving the support block to disengage from the fixed groove.

[0006] Its effects are as follows: By setting up a support locking mechanism, during hoisting, the lifting ring is lifted by force, and the vertical tension is converted into the power to drive the slider to move laterally through the transmission component. The slider pushes the support block to extend along the slide groove through the connecting rod, so that the support block inserts into the fixed groove on the inside of the box door. This ensures that the box body and the box door are connected as a rigid whole under stress, thereby constructing a closed-loop stress frame inside the box body, which greatly enhances the overall structural strength of the box body and avoids problems such as box door jamming or box body damage caused by deformation. At the moment when the box body is placed on the ground after hoisting, if one of the universal rollers touches the ground first, the tension on the lifting ring will weaken accordingly. At this time, the energy-storing elastic element begins to release energy to drive the slider to reset. This reset process absorbs part of the impact kinetic energy of the landing, so that the weight of the box body will not instantly and rigidly impact the support of a single universal roller. Instead, with the reset of the elastic element, the weight is distributed smoothly and evenly to all universal rollers, effectively preventing the roller support from breaking and significantly extending the service life of the transport box.

[0007] Preferably, the transmission component includes a sliding rod and a traction component. The sliding rod is slidably mounted on the side wall of the housing in a vertical direction. The upper end of the sliding rod extends out of the housing and is connected to the lifting ring. One end of the traction component is connected to the lower end of the sliding rod, and the other end extends into the mounting groove and is connected to the slider.

[0008] Preferably, a support block is slidably provided on the top of the enclosure, and a fixing groove is provided on the upper inner side of the enclosure door to cooperate with the top support block. The transmission component also includes a connecting rod, which connects the bottom support block and the top support block to drive the two support blocks to extend synchronously and lock the top and bottom ends of the enclosure door. The effect is that the connecting rod enables vertical linkage, ensuring that the top and bottom of the enclosure door are locked simultaneously during hoisting, so that the enclosure door and the enclosure form a closed-loop frame with multi-point support in the height direction, further improving the overall rigidity.

[0009] Preferably, the opening edge of the container body is provided with a limiting protrusion, and the inner edge of the container door is provided with a limiting groove that mates with the limiting protrusion. A sealing ring is installed in the limiting groove. When the container door is closed, the limiting protrusion inserts into the limiting groove and presses against the sealing ring, forming a sealing fit between the container body and the container door. The effect is that the sealing structure of the protrusion and groove, combined with the strong locking of the internal support locking mechanism, can provide active compressive force under lifting stress, forcing the sealing ring to maintain a high compression ratio, effectively preventing rainwater and sand from entering the container body and ensuring the safety of the goods inside.

[0010] Preferably, a fixed block is provided in the middle of the mounting groove, and the elastic element is a spring. The spring is connected between the slider and the fixed block. A telescopic guide rod is also connected between the slider and the fixed block. The telescopic guide rod passes through the inside of the spring and is used to limit the spring's linear extension and contraction. The effect is that the telescopic guide rod effectively limits the spring's movement trajectory, prevents the spring from bending laterally, and improves the stability of the mechanism's operation.

[0011] Preferably, the end of the support block facing the door is arc-shaped to provide guidance when inserted into the fixing slot.

[0012] Preferably, rollers are provided on the side walls of both the support block and the slider, and the rollers make rolling contact with the side walls of the groove or mounting groove. The effect is that the sliding friction between the support block, slider and groove wall is converted into rolling friction, which significantly reduces the resistance of the mechanism operation, while reducing the wear of the moving parts on the rotational molding box groove wall and extending the service life of the box and the mechanism.

[0013] Preferably, the side walls and doors of the enclosure are integrally formed with several reinforcing ribs, which are distributed in a crisscrossing grid pattern. The density of the reinforcing ribs is greater than that of other areas around the fixing groove to enhance the deformation resistance of the fixing groove.

[0014] Preferably, the bottom of the box is equipped with several omnidirectional casters.

[0015] Preferably, the bottom of the housing is provided with a forklift slot, the width of which can be adjusted to accommodate forks of different sizes.

[0016] By adopting the above technical solution, the beneficial effects of the present invention are as follows: 1. This invention, by setting up a support locking mechanism, uses the lifting force to drive the slider to move during the hoisting of the box, and then pushes the support block into the fixing groove inside the box door through the connecting rod, so that the box and the box door are connected into a rigid whole under the stress state, which greatly enhances the overall structural strength of the box, effectively prevents the deformation of the box due to the lifting force, and solves the problem of the box door jamming or box damage caused by deformation.

[0017] 2. This invention utilizes the energy storage and reset characteristics of springs to provide buffering and balancing during the hoisting and landing of the container. When one of the universal rollers of the container first contacts the ground, the spring gradually resets and releases the tension, so that the weight of the container is not concentrated on a single point all at once, but is distributed smoothly to all the universal rollers as the spring resets. This effectively prevents the universal rollers from being damaged due to uneven force and extends the service life of the transport container. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a front view of the present invention.

[0020] Figure 3 This is a partial structural diagram of the housing of the present invention.

[0021] Figure 4 This is a schematic diagram of the assembly structure of the housing and the support locking mechanism of the present invention.

[0022] Figure 5 For the present invention Figure 4 A magnified structural diagram of point A in the middle.

[0023] Figure 6 This is a schematic diagram of the support and locking mechanism of the present invention.

[0024] Figure 7 This is a schematic diagram of the assembly structure of the support block and slider of the present invention.

[0025] Figure 8 This is a schematic diagram of the assembly structure of the support block and connecting rod of the present invention.

[0026] Figure label: 11. Box body; 111. Slide groove; 112. Mounting groove; 113. Cover plate; 12. Box door; 121. Fixing groove; 13. Lifting ring; 14. Reinforcing rib; 15. Universal roller; 16. Forklift slot; 21. Support block; 22. Slider; 23. Elastic element; 24. Connecting rod; 25. Sliding rod; 26. Traction element; 27. Connecting rod; 28. Fixing block; 29. ​​Telescopic guide rod. Detailed Implementation

[0027] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0028] like Figures 1-8 As shown, a rotomolded transport box includes a box body 11, a box door 12, and a support and locking mechanism disposed inside the box body 11.

[0029] like Figures 1-3 As shown, the container 11, serving as the base of the entire transport container, is made of imported polymer materials and molded in one piece using rotational molding, giving it characteristics of no internal stress, uniform wall thickness, corrosion resistance, and UV resistance. The container 11 is typically rectangular or cubic in shape, forming a large internal cavity for storing precision instruments, military supplies, or valuable equipment. To further enhance the structural rigidity of the container 11 and prevent bulging or collapse during stacking or transportation, both the outer and inner walls of the container 11 are designed with several reinforcing ribs 14, which are distributed in a crisscrossing grid pattern.

[0030] Box doors 12 are hinged to the openings on both sides of the box body 11. The boxes doors 12 are also made using a rotational molding process, and both the inner and outer sides of the boxes doors 12 are provided with several reinforcing ribs 14. One edge of the boxes door 12 is pivotally connected to the box body 11 via a hinge, allowing the boxes door 12 to rotate around the hinge axis to open or close the box opening. A dovetail pin assembly is provided on the other side of the box body 11. When the boxes door 12 is closed, the dovetail pin inserts into the corresponding pin groove, thus closing the boxes door 12.

[0031] Lifting rings 13 are installed at the four corners of the top of the box 11. Each lifting ring 13 is installed in a groove reserved on the top of the box 11. When not in use, the lifting rings 13 can be stored in the groove, so that the top surface of the box 11 remains flat, thereby allowing for stable stacking of multiple boxes 11 during transportation.

[0032] like Figures 2-4As shown, to achieve a seal between the enclosure 11 and the door 12, a continuous ring of limiting protrusions is integrally formed at the opening edge of the enclosure 11. Correspondingly, a limiting groove is formed on the inner edge of the door 12, precisely matching the shape of the limiting protrusion, and a sealing ring is embedded in the limiting groove. When the door 12 is closed, the limiting protrusion not only provides initial physical positioning for the door 12, preventing it from wobbling up, down, left, or right, but more importantly, it inserts into the limiting groove and presses against the sealing ring. Since the limiting protrusion is rigid and the sealing ring is elastic, the pressure generated by their compression creates a huge contact pressure, forming a tight barrier against moisture. This not only prevents water and dust but also helps to distribute the force on the hinge when the enclosure 11 is subjected to external impact, protecting the integrity of the sealing structure.

[0033] like Figures 3-8 As shown, the support locking mechanism includes a support block 21, a slider 22, an elastic element 23, a connecting rod 24, and a transmission element. Specifically, a sliding groove 111 is provided at the bottom of the box body 11 along the direction perpendicular to the box door 12 (i.e., the front-to-back direction), and an installation groove 112 is provided along the direction parallel to the box door 12 (i.e., the left-to-right direction). A removable cover plate 113 is installed at the upper end of the sliding groove 111 and the installation groove 112. Under normal conditions, the cover plate 113 closes the sliding groove 111 and the installation groove 112 to avoid affecting the storage of goods. The support block 21 is slidably installed in the sliding groove 111 and can extend and retract under the constraint of the sliding groove 111. A fixing groove 121 that cooperates with the support block 21 is provided on the inner side wall of the box door 12. The density of the reinforcing ribs 14 on the periphery of the fixing groove 121 is greater than that in other areas, which can effectively disperse stress and prevent the fixing groove 121 from cracking or deforming when subjected to huge shear forces, thus ensuring the reliability of the locking. The slider 22 is slidably mounted in the mounting groove 112, serving as a power transfer station. The elastic element 23 is connected between the slider 22 and a fixed point on the housing 11, providing a restoring force to the slider 22, thereby pulling the slider 22 to its initial position. The two ends of the connecting rod 24 are respectively hinged to the support block 21 and the slider 22 by pins, forming a "crank-slider" type force transmission mechanism.

[0034] The transmission component acts as a bridge connecting the external hoisting operation and the slider 22. One end is connected to the lifting ring 13, and the other end is connected to the slider 22. It can convert the vertical hoisting force into the power to drive the slider 22 to move laterally. When the box 11 is hoisted, the lifting ring 13 is lifted by force and drives the slider 22 to slide against the resistance of the elastic element 23 through the transmission component. The slider 22 drives the support block 21 to extend along the slide groove 111 and insert into the fixed groove 121 through the connecting rod 24 to lock the box 11 and the box door 12. When the box 11 is lowered to the ground and the force is released, the elastic element 23 drives the slider 22 to reset, thereby driving the support block 21 to disengage from the fixed groove 121.

[0035] like Figures 4-8 As shown, the transmission components include a sliding rod 25 and a traction member 26. The sliding rod 25 is typically made of stainless steel and is slidably mounted in a groove on the side wall of the housing 11 in a vertical direction. The upper end of the sliding rod 25 extends out through a sealing hole at the top of the housing 11 and is securely connected to the lifting ring 13. A limit block is provided at the upper part of the sliding rod 25, and the sliding range of the sliding rod 25 can be determined by the obstruction of the limit block at the top of the housing 11. The traction member 26 is preferably made of high-strength flexible steel wire rope or industrial-grade nylon lifting strap. One end of the traction member 26 is fixed to the lower end of the sliding rod 25, and the other end is guided by a steering pulley (not shown) and extends into the mounting groove 112 at the bottom of the housing 11, and finally securely connected to the slider 22. When the crane hooks the lifting ring 13 and pulls upward, the sliding rod 25 first undergoes an upward displacement. This displacement is transmitted to the slider 22 through the traction member 26, overcoming the resistance of the elastic member 23 and pulling the slider 22 to slide within the mounting groove 112.

[0036] like Figures 3-8 As shown, in this embodiment, a support block 21 is slidably provided on the top of the box body 11, and a fixing groove 121 corresponding to the top support block 21 is provided on the upper inner side of the box door 12. Specifically, a sliding groove 111 is also provided on the top of the box body 11, and the support block 21 located at the top is slidably installed in the sliding groove 111 at the top and can move in the front-back direction. In order to ensure the absolute consistency of the up and down movement, the transmission component also includes a connecting rod 27. The bottom end of the connecting rod 27 is connected to the bottom support block 21, and the top end is connected to the top support block 21. The connecting rod 27 is accommodated in a vertical groove opened on the inner side of the side wall of the box body 11 and is constrained to only move in the front-back direction with the support block 21. When the bottom support locking mechanism is activated, the connecting rod 27 forcibly drives the top support block 21 to move synchronously, so that at the moment of hoisting, the upper and lower ends of the box door 12 can be locked by the support block 21 at the same time, realizing the double locking of the upper and lower ends of the box body 11. At this point, the door 12 is no longer just a moving part hanging on the hinge, but is rigidly connected to the box body 11 through two points, becoming part of the load-bearing structure of the side wall of the box body 11. This greatly improves the overall rigidity of the box body 11, ensures that the mating surfaces of the door 12 do not misalign, ensures sealing, and eliminates the risk of the door 12 getting stuck and unable to open due to deformation.

[0037] like Figures 4-8 As shown, a fixed block 28 is provided in the middle of the mounting groove 112. The elastic element 23 is preferably a spring, which is installed between the slider 22 and the fixed block 28. To prevent the spring from bending laterally during extension and retraction, a telescopic guide rod 29 is also connected between the slider 22 and the fixed block 28. The telescopic guide rod 29 passes through the inside of the spring, ensuring that the spring always applies force in a straight line during extension and retraction, thereby improving the stability of the mechanism.

[0038] like Figures 1-6 As shown, the end of the support block 21 facing the door 12 is not flat, but designed with an arc shape. This arc-shaped head design allows the support block 21 to automatically center itself when it contacts the edge of the fixing groove 121, smoothly squeezing into the fixing groove 121 and avoiding jamming. In addition, to further reduce frictional resistance, rollers are provided on the side walls of both the support block 21 and the slider 22. The rollers transform the original sliding friction into rolling friction, greatly reducing wear on the inner walls of the slide groove 111 and the mounting groove 112, and extending their service life.

[0039] like Figures 1-8 As shown, several universal rollers 15 are installed at the bottom of the box 11 to facilitate its movement on a flat surface. When the box 11 is hoisted and ready to be placed on the ground, due to uneven ground or tilted hoisting posture, one of the universal rollers 15 often contacts the ground first. At this time, the weight of the box 11 begins to act on that universal roller 15, and the tension on the lifting ring 13 decreases accordingly. In traditional transport boxes, this instantaneous impact force would act entirely on the roller bracket in contact with the ground, which is very easy to cause damage. In this embodiment, by setting a support locking mechanism, when one of the universal rollers 15 contacts the ground, due to the intervention of the ground support force, the relative tension between the box 11 and the lifting device decreases, and the sliding rod 25 tends to return to its original position, which in turn causes the traction member 26 to loosen. As the tension decreases, the elastic member 23, which has been stretched and stored energy, begins to release energy, attempting to pull the slider 22 back to its original position. This return process is not completed instantaneously, but is constrained by the release speed of the traction member 26 and the release speed of the lifting device. Therefore, during this process, the restoring force of the spring counteracts the downward trend of the housing 11, providing a flexible buffer stroke. When one of the universal rollers 15 touches the ground, the housing 11 does not slam hard onto the ground. Instead, the reverse motion of the mechanism is converted into a change in the potential energy of the spring. The deformation of the spring absorbs part of the impact energy, giving the housing 11 time to fine-tune its posture until all the universal rollers 15 land smoothly, effectively protecting the universal rollers 15 and avoiding damage from local overload. When all the universal rollers 15 are on the ground and the lifting device is fully released, the sliding rod 25 falls back to the lowest point under the action of gravity, the slider 22 returns to its initial position under the action of the spring, and the support block 21 retracts completely into the slide groove 111, disengaging from the door 12. At this time, the door 12 returns to its free state, and the operator can open the door 12 normally without the door 12 getting stuck due to deformation caused by the lifting. This achieves intelligent operation of "locking upon lifting and unlocking upon landing," without the need for manual intervention.

[0040] like Figures 1-3As shown, a forklift slot 16 is provided at the bottom of the housing 11. The forklift slot 16 can be designed to be adjustable; for example, one side baffle of the forklift slot 16 can be moved left and right and locked on the bottom slide rail by bolts. In use, the operator only needs to adjust the width of the forklift slot 16 according to the specifications of the forklift on site, so that it fits snugly against the edge of the forks. This not only facilitates picking up and dropping, but also prevents the housing 11 from sliding left and right on the forks during handling, thus improving the safety of transportation.

[0041] Based on the above-described device, the working process and working principle of the present invention are as follows: When the container 11 is stationary, pushed by the casters 15, or transported by forklift, the bottom of the container 11 is supported to prevent deformation. At this time, since the lifting ring 13 is not under stress, the container 11 is stationary, and the slider 22 is in its initial position under the elastic force of the elastic element 23. The connecting rod 24 drives the support block 21 to retract completely into the slide groove 111, without extending beyond the end face of the container 11. At this time, the support block 21 separates from the fixing groove 121 on the container door 12, allowing the user to freely open or close the container door 12 for loading and unloading goods.

[0042] When hoisting operations are required, the operator engages the hook with the lifting ring 13 and lifts the object. As the crane cable tightens, the lifting ring 13 experiences a significant upward pull, causing the sliding rod 25 to slide upward along the side wall of the housing 11. The sliding rod 25 pulls the slider 22 inside the housing 11 via the traction member 26. Under the action of the traction force, the slider 22 overcomes the resistance of the elastic member 23 and slides along the mounting groove 112. The movement of the slider 22 forces the connecting rod 24 to deflect at an angle, thereby pushing the support block 21 to extend outward along the sliding groove 111. When the housing 11 is about to leave the ground, the sliding rod 25 moves upward to its limit position, and the slider 22 is pulled to its maximum stroke. At this point, the end of the support block 21 is fully inserted into the fixing groove 121 inside the housing door 12, tightly and mechanically connecting the housing 11 to the housing doors 12 on both sides, forming a rigid frame. At this point, continue pulling the lifting ring 13 upwards to lift the entire box 11 smoothly. Throughout the entire aerial hoisting process, as long as the lifting ring 13 is under force, this locked state will be maintained, effectively preventing the box 11 from shrinking and deforming due to heavy load, and protecting the box door 12 and the sealing structure.

[0043] When the container 11 is placed on the destination ground, one or more of the omnidirectional rollers 15 will first contact the ground. At this time, the tension on the lifting ring 13 begins to weaken, and the elastic potential energy stored in the elastic element 23 begins to be released, attempting to pull the slider 22 back to its original position. During this process, the elastic element 23 acts as a shock absorber, absorbing the impact of the landing and gradually and smoothly transferring the weight of the container 11 to all the omnidirectional rollers 15, preventing overload damage to the omnidirectional rollers 15. When the container 11 has completely landed and the lifting ring 13 has been completely released, the elastic element 23 drives the slider 22 to fully return to its original position. The slider 22 pulls the support block 21 back into the slide groove 111 via the connecting rod 24, disengaging it from the fixed groove 121. At this time, the container door 12 automatically unlocks, returning to a freely openable state, allowing for unpacking without manual intervention.

[0044] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A rotomolded transport box, comprising a box body (11) and box doors (12) hinged to openings on both sides of the box body (11), wherein the top of the box body (11) is provided with lifting rings (13), characterized in that, It also includes a support and locking mechanism located inside the housing (11); The support locking mechanism includes a support block (21), a slider (22), an elastic element (23), a connecting rod (24), and a transmission element. The bottom of the housing (11) is provided with a sliding groove (111) and a mounting groove (112). The support block (21) is slidably installed in the sliding groove (111) and can move in a direction perpendicular to the door (12). The slider (22) is slidably installed in the mounting groove (112) and can move in a direction parallel to the door (12). The inner side of the door (12) is provided with a fixing groove (121) that cooperates with the support block (21). The elastic element (23) is connected between the slider (22) and the fixing point of the housing (11) to provide a restoring force for the slider (22). The two ends of the connecting rod (24) are respectively hinged to the support block (21) and the slider (22). One end of the transmission element is connected to the lifting ring (13), and the other end is connected to the slider (22). When the box (11) is hoisted, the lifting ring (13) is lifted by force and drives the slider (22) to overcome the resistance of the elastic element (23) and slide through the transmission component. The slider (22) drives the support block (21) to extend along the slide groove (111) and insert into the fixed groove (121) through the connecting rod (24) to lock the box (11) and the box door (12). When the box (11) is unloaded on the ground, the elastic element (23) drives the slider (22) to reset, thereby driving the support block (21) to disengage from the fixed groove (121).

2. The rotomolded transport box according to claim 1, characterized in that, The transmission component includes a sliding rod (25) and a traction component (26). The sliding rod (25) is slidably installed on the side wall of the housing (11) in the vertical direction. The upper end of the sliding rod (25) extends out of the housing (11) and is connected to the lifting ring (13). One end of the traction component (26) is connected to the lower end of the sliding rod (25), and the other end extends into the mounting groove (112) and is connected to the slider (22).

3. A rotationally molded transport box according to claim 2, characterized in that, The top of the box (11) is provided with a support block (21) that slides on it. The upper end of the inner side of the box door (12) is provided with a fixing groove (121) that cooperates with the top support block (21). The transmission component also includes a connecting rod (27). The connecting rod (27) is connected between the bottom support block (21) and the top support block (21) to drive the upper and lower support blocks (21) to extend synchronously, so as to lock the upper and lower ends of the box door (12).

4. A rotationally molded transport box according to claim 1, characterized in that, The opening edge of the box body (11) is provided with a limiting protrusion, and the inner edge of the box door (12) is provided with a limiting groove that matches the limiting protrusion. A sealing ring is installed in the limiting groove. When the box door (12) is closed, the limiting protrusion is inserted into the limiting groove and presses against the sealing ring, forming a sealing fit between the box body (11) and the box door (12).

5. A rotationally molded transport box according to claim 1, characterized in that, The mounting slot (112) has a fixing block (28) in the middle. The elastic element (23) is a spring. The spring is connected between the slider (22) and the fixing block (28). A telescopic guide rod (29) is also connected between the slider (22) and the fixing block (28). The telescopic guide rod (29) passes through the inside of the spring and is used to limit the spring from extending and contracting in a straight line.

6. A rotationally molded transport box according to claim 1, characterized in that, The end of the support block (21) facing the door (12) is arc-shaped and is used to provide guidance when it is inserted into the fixing slot (121).

7. A rotationally molded transport box according to claim 1, characterized in that, Rollers are provided on the side walls of the support block (21) and the slider (22), and the rollers make rolling contact with the side walls of the slide groove (111) or the mounting groove (112).

8. A rotationally molded transport box according to claim 1, characterized in that, The side walls and doors (12) of the box body (11) are integrally formed with several reinforcing ribs (14). The reinforcing ribs (14) are distributed in a grid pattern, and the density of the reinforcing ribs (14) on the periphery of the fixing groove (121) is greater than that in other areas, so as to enhance the deformation resistance of the fixing groove (121).

9. A rotationally molded transport box according to claim 1, characterized in that, The bottom of the housing (11) is provided with several universal casters (15).

10. A rotationally molded transport box according to claim 1, characterized in that, The bottom of the housing (11) is provided with a forklift slot (16), the width of which can be adjusted to accommodate forks of different sizes.

Images