Tray assembly

Abstract

The application discloses a tray combination, which comprises a frame type tray base, an inclined support, an adjustable lateral limiting component and a door end positioning and protection component. The tray base is formed by a rectangular frame, a middle beam and an auxiliary beam to form a bearing frame, and the bottom is formed with a stacking space for inserting another tray supporting structure. The inclined support has a facing supporting slope. The adjustable lateral limiting component comprises a limiting seat which is movable along the middle rod and is locked. The vertical pipe and the vertical plate on the limiting seat can be converted between the vertical limiting state and the horizontal storage state. The door end positioning and protection component comprises a supporting seat and a baffle which is slidable along the perforation of the supporting seat. The baffle can be moved between the retracted position and the extended position, and is locked by the lock block, the limiting hole and the limiting rod. The tray can realize the retraction of the door end component, the multi-directional constraint of the steel coil and the folding and nesting of the limiting piece under the three working conditions of the boxing, the bearing transportation and the empty storage, and can consider the boxing passability, the transportation safety, the multi-specification adaptability and the empty storage efficiency.

Description

Technical Field

[0001] This invention relates to the field of steel coil carrying and transporting equipment in containers, specifically to a pallet assembly. Background Technology

[0002] Steel coils are characterized by their large mass, rounded outer surface, high center of gravity, and tendency to roll and shift during transportation. In production workshops, warehouses, and container shipping, specialized steel coil pallets are typically used to support the outer surface of the steel coils and to restrict the displacement of the coils and pallets in different directions.

[0003] To ensure load-bearing capacity, existing steel coil pallets often employ heavy, integral, or enclosed steel structures. While these pallets provide a certain level of strength under load, they are difficult to nest when unloaded, occupying significant storage and return space. Furthermore, different steel coils have varying axial widths; if the limiting structure is fixed in position, it is often only applicable to a narrow range of specifications. Using fixed limiting components protruding from the top of the pallet can interfere with stacking empty pallets.

[0004] Another issue arises with door-end pallets positioned near the container doors in open-top containers. To minimize longitudinal movement of the pallet, door-end pallets are typically placed close to the container door. Inertial loads generated during vehicle operation, braking, turning, or loading / unloading can cause the pallet to tend to move towards the door. If the pallet directly impacts the door with its base, the door, as the opening and closing mechanism, may deform, affecting its opening, closing, sealing, and subsequent use. Furthermore, the limited lateral space inside the container means that if the door-end limiting mechanism always protrudes outwards, it will hinder the pallet's loading into the container.

[0005] Therefore, practical steel coil container logistics needs to simultaneously address the challenges of adapting to different steel coil widths, lateral passage during loading, longitudinal limiting at the door ends during transportation, and high-density stacking during the empty-load phase. These conditions are mutually restrictive: during transportation, the limiting components need to be in their working positions, while during loading and stacking, the corresponding components need to be retracted or folded as much as possible. Existing single fixed pallet structures are insufficient to meet these requirements. Summary of the Invention

[0006] The purpose of this invention is to provide a pallet assembly that integrates a nested frame stacking structure, a movable and foldable axial limiting structure for steel coils, and a retractable, extendable, and mechanically locked door-end positioning and protection structure into the same pallet. This allows the same carrying platform to change the spatial state of the limiting components according to three working conditions: packing, transportation, and empty stacking. Without adding independent external fixing fixtures, this invention balances the steel coil load-bearing stability, specification adaptability, door-end anti-collision safety, packing passage, and empty storage efficiency.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0008] A stackable and adjustable pallet assembly for transporting containerized steel coils includes a pallet base and a slanted bracket mounted on the pallet base. The pallet base has a frame structure with a stacking clearance space at the bottom for inserting another pallet support structure. A central rod is provided in the middle of the pallet base, and a limiting seat is slidably mounted on the central rod. The limiting seat can be adjusted and locked along the central rod, and has a limiting element for restricting the axial movement of the steel coil. The limiting element can switch between a vertical limiting state and a lateral retracted state. A support base is provided on the door end side of the pallet base. A through hole extending laterally along the pallet base is provided in the support base, and a baffle is slidably mounted in the through hole. The baffle can move between a retracted position and an extended position. A locking block is provided on the baffle, and a limiting hole and a limiting rod are provided on the support base for the locking block to pass through. When the baffle is in the extended position, the end of the baffle extends out of the side edge of the pallet base and cooperates with the vertical frame of the container door end. The limiting rod is inserted into the limiting space formed between the locking block and the support base to restrict the movement of the baffle.

[0009] Preferably, the tray base includes a rectangular frame, a middle beam, and an auxiliary beam connecting the middle beam and the rectangular frame. The rectangular frame, the middle beam, and the auxiliary beam form a spatial load-bearing structure and together constitute the stacking clearance space.

[0010] Preferably, the inclined bracket includes a left plate and a right plate, the left plate and the right plate are connected to form a triangular support structure, and the supporting inclined surfaces of the two inclined brackets supporting the same steel coil are arranged facing each other.

[0011] Preferably, a connecting rod is provided between two inclined brackets supporting the same steel coil, the connecting rod making the two inclined brackets form an integral force-bearing structure, and a buffer pad is provided on the supporting surface of the inclined bracket.

[0012] Preferably, the limiting seat includes a sliding sleeve sleeved outside the intermediate rod, the intermediate rod is provided with multiple sets of insertion holes along its length, and the sliding sleeve is fixed by engaging with the corresponding insertion holes through an insertion shaft.

[0013] Preferably, the limiting seat includes a left limiting seat and a right limiting seat arranged opposite to each other, and the left limiting seat and the right limiting seat move along the middle rod respectively to adjust the limiting distance to adapt to steel coils of different widths.

[0014] Preferably, the limiting member includes a vertical tube connected to the sliding sleeve via a hinge shaft, the vertical tube being kept in a vertically limited state via a positioning shaft; a vertical plate is provided on the vertical tube, and a reinforcing rib is provided between the vertical plate and the vertical tube.

[0015] Preferably, after the positioning shaft is released, the vertical tube can rotate around the hinge shaft to a horizontally retracted state that is basically parallel to the middle rod, and the fixing block is provided with rounded corners and the vertical tube is provided with cuts to form a rotation avoidance structure.

[0016] Preferably, two support seats are provided and located in the two door corner areas of the tray seat respectively; a buffer block is provided at one end of the baffle facing the vertical frame of the container door, and a tail plate and a pull ring for driving the baffle to move are provided at the other end.

[0017] Preferably, it can switch between a boxed state, a steel coil carrying and transporting state, and an empty stacking state. In the boxed state, the baffle is retracted; in the transporting state, the baffle is extended and locked and the limiting member is in a vertical limiting state; in the empty stacking state, the limiting member is in a storage state and the pallets are nested and stacked by making room for stacking.

[0018] In summary, the present invention has at least one of the following beneficial effects:

[0019] (1) A clear load-bearing path is formed by the frame-type tray base, the opposing triangular inclined brackets and the connecting rods, which controls the self-weight of the tray while maintaining the load-bearing stability of the steel coil; the bottom of the tray base retains a through stacking space, which can realize the nesting of empty trays.

[0020] The limiting seat can be adjusted along the middle rod and locked by the insert shaft, and the left and right limiting distance can be changed according to the axial width of the steel coil; the limiting vertical tube can be flipped and stored, solving the contradiction of "it needs to protrude vertically when working, but cannot protrude when stacked".

[0021] The door end baffle retracts during the loading stage, extends and locks in place after reaching its position, and reliably limits the door end while taking into account the lateral passage size of the container and the transportation status.

[0022] (2) During transportation, the longitudinal force at the door end is transmitted to the vertical frame of the container door end through the plate seat, support seat and baffle, reducing the possibility of the pallet directly impacting the container door; the buffer block further reduces rigid collision.

[0023] (3) The same pallet can be switched between the packed state, the loaded transport state and the empty stacking state, reducing the need for additional tooling for different logistics stages and improving the versatility and turnover efficiency of container steel coil transport equipment.

[0024] Synergistic Effect: This invention does not simply juxtapose "stackable pallets," "adjustable limiting components," and "door end baffles" as independent entities, but rather addresses the shared technical challenge of different external constraints on the same pallet at different logistics stages through structural synergy. The packing stage requires the pallet's lateral external profile to be as small as possible; the transportation stage requires multi-directional constraints in the radial, axial, and longitudinal directions of the container; and the empty stacking stage requires protruding components to exit the stacking envelope. This invention utilizes the lateral sliding of the baffles, the hinged flipping of the limiting components, and the stacking clearance space at the bottom of the pallet base to allow these three states to be sequentially switched on the same structure.

[0025] Under load and transport conditions, the opposing inclined brackets restrict the radial rolling tendency of the steel coil; the left and right limit seats, adjusted along the intermediate rod, restrict the axial movement of the steel coil via the vertical plate; after the door end baffle extends and locks, the longitudinal lateral force of the pallet towards the container door is transmitted to the vertical frame of the container door through the support seat and the baffle. This forms a graded constraint path for different directions of movement of the steel coil / pallet, avoiding the need to rely solely on the container door or a single fixed block to bear the entire inertial load.

[0026] In both packed and unloaded states, the aforementioned constraint components can retract into their working positions: the baffle retracts into the support base to reduce the lateral occupancy at the door end, the limiting vertical tube flips to be substantially parallel to the intermediate rod to reduce its upward protrusion, and the through space of the frame-type tray allows for the insertion of another tray. Therefore, the reliability of the limiting mechanism and the passage / stacking space are not achieved by sacrificing one of them, but rather through a variable-state structure that achieves compatibility.

[0027] Furthermore, the directional alignment of the locking block and the limiting hole serves both as a guide for the baffle assembly and as a preventative measure against errors. The limiting rod, located between the locking block and the inner wall of the support base, forms a clear mechanical lock. The tail plate limits the baffle's extension position, and the buffer block reduces the rigid impact between the baffle and the vertical frame at the door end. These structures collectively improve the certainty and operability of the force transmission path at the door end. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the bottom space structure of the tray in the embodiment.

[0029] Figure 2 This is a schematic diagram of the overall structure of the tray in the embodiment.

[0030] Figure 3 This is a schematic diagram of two trays stacked in the embodiment.

[0031] Figure 4 This is a schematic diagram of the sliding and locking structure between the middle rod and the limiting seat in the embodiment.

[0032] Figure 5 This is a schematic diagram of the hinge and positioning structure of the limiting seat in the embodiment.

[0033] Figure 6 This is a schematic diagram of the structure when the limiting member is in the vertical limiting position in the embodiment.

[0034] Figure 7 This is a schematic diagram of the left and right limiting seats moving to the end of the middle rod and being in a horizontally retracted state in the embodiment.

[0035] Figure 8 This is a schematic diagram of the tray assembly structure in the embodiment.

[0036] Figure 9 yes Figure 8 Enlarged view of part A in the image.

[0037] Figure 10 This is a schematic diagram showing the position of the limiting rod between the support base and the locking block in the embodiment.

[0038] Figure 11 This is an exploded view of the support base and baffle in the embodiment.

[0039] Figure 12 This is a schematic diagram of the pallet assembly installed at the container door position in the embodiment.

[0040] Figure 13 This is a schematic diagram of the pallets and steel coils placed inside the container in the embodiment.

[0041] In the diagram: 1. Disc base; 11. Intermediate beam; 12. Auxiliary beam; 2. Diagonal bracket; 21. Left plate; 22. Right plate; 23. Connecting rod; 3. Intermediate rod; 41. Left limit seat; 42. Right limit seat; 51. Insert shaft; 52. Insert hole; 61. Hinge shaft; 62. Positioning shaft; 71. Sliding sleeve; 72. Fixing block; 73. Rounded corner; 74. Vertical tube; 75. Cutout; 76. Vertical plate; 77. Reinforcing rib; 8. Forklift hole; 03. Support base; 031. Side plate; 032. Top plate; 033. Inclined surface; 034. Through hole; 035. Limiting hole; 04. Baffle; 041. Buffer block; 042. Locking block; 043. Tail plate; 044. Pull ring; 05. Limiting rod; 06. Lifting ring; 07. Vertical rod. Detailed Implementation

[0042] The present invention will be further described in detail below with reference to the accompanying drawings.

[0043] The following is combined with Figures 1 to 13 The present invention will be further described below. It should be noted that the following embodiments are used to explain the structural relationships and working principles of the present invention, and are not intended to limit the present invention to the specific dimensions listed; while maintaining the technical relationships defined in the claims, each dimension can be adjusted according to container specifications, steel coil dimensions, and rated load.

[0044] Example: A tray assembly, such as Figures 1-3and Figure 8 As shown, the pallet base 1 is a rectangular frame. The pallet base 1 is formed by horizontally and vertically arranged and welded metal square tubes, with a central beam 11 inside the rectangular frame. Auxiliary beams 12 connect the central beam 11 to the rectangular frame, making the pallet base 1 a spatial load-bearing frame. Instead of completely enclosed panels between the beams, open spaces are formed. When empty pallets are stored together, the corresponding support structure of the upper pallet can enter the frame space of the lower pallet, allowing adjacent pallets to be nested and stacked, thereby reducing the overall stacking height.

[0045] According to the engineering design, a pallet assembly can have dimensions of approximately 1841 mm in length, approximately 2180 mm in width (including the rubber pad), and approximately 650 mm in height. The crossbeams and longitudinal beams can be made of square tubing with a wall thickness of approximately 3 mm and a cross-section of approximately 120 mm × 120 mm. Reinforcing square tubing with a wall thickness of approximately 3 mm and a cross-section of approximately 100 mm × 250 mm is added to the forklift support area. The above parameters are for engineering embodiments and are not intended to limit the scope of protection of this invention. A drainage hole can also be provided at the bottom of the pallet base 1 to drain rainwater or washing water.

[0046] Four inclined brackets 2 are provided on the base 1. Each inclined bracket 2 includes a left plate 21 and a right plate 22, which are connected to form an approximately triangular support structure. Two inclined brackets 2 supporting the same steel coil are arranged opposite each other, with their supporting inclined surfaces facing each other, so that the outer circumference of the steel coil contacts the two supporting inclined surfaces respectively, thereby restricting the radial rolling of the steel coil. A connecting rod 23 is provided between the corresponding inclined brackets 2, so that the two inclined brackets 2 form an integral load-bearing structure; rubber or other buffer pads can be provided on the supporting surface to reduce the impact when the steel coil is hoisted and lowered into position.

[0047] like Figures 4 to 7 As shown, to accommodate steel coils with different axial widths, a central rod 3 is fixedly installed in the middle of the tray 1. The central rod 3 is preferably made of square tubing and arranged along the axial direction of the steel coil. A left limiting seat 41 and a right limiting seat 42 are provided on the central rod 3. The two have the same structure and are symmetrical to each other. Taking the left limiting seat 41 as an example, it includes a sliding sleeve 71 sleeved on the outside of the central rod 3. The central rod 3 has multiple sets of insertion holes 52 along its length. After the sliding sleeve 71 moves to the target position, the insertion shaft 51 is inserted into the corresponding insertion hole 52, thereby fixing the position of the limiting seat. The insertion shaft 51 may also be equipped with a locking pin or elastic locking pin or other anti-disengagement structure.

[0048] A fixing block 72 is provided on the sliding sleeve 71. The vertical tube 74 is connected to the fixing block 72 via a hinge shaft 61 and is kept in a vertically limited state by the positioning shaft 62. A vertical plate 76 is provided on the vertical tube 74, forming a larger limiting contact surface on the side facing the steel coil. A reinforcing rib 77 is provided between the vertical plate 76 and the vertical tube 74 to improve bending resistance. After the steel coil is placed on the inclined bracket 2, the left limiting seat 41 and the right limiting seat 42 are moved according to the axial width of the steel coil, so that the vertical plates 76 on both sides are close to the end face of the steel coil, and then locked by the insertion shaft 51, thereby restricting the axial movement of the steel coil.

[0049] When the steel coil is removed or the pallets need to be stacked, the positioning shaft 62 is released, allowing the vertical tube 74 to rotate around the hinge shaft 61 to a horizontally retracted state that is substantially parallel to the intermediate rod 3. The fixing block 72 has rounded corners 73, and the lower end of the vertical tube 74 has a cutout 75 to provide clearance for the flipping movement. At least three sets of insertion holes 52 are provided on the intermediate rod 3, with at least one set located at the end of the intermediate rod 3, so that the limiting seat can move to the end first before folding and storing, thereby reducing interference of the limiting component with the nesting of the upper and lower pallets.

[0050] like Figures 8 to 11 As shown, two support seats 03 are provided on the side of the tray base 1 near the container door, and the two support seats 03 are located in the corner areas of the two door ends of the tray base 1. Each support seat 03 can be composed of a side plate 031 and a top plate 032 arranged opposite each other. The top plate 032 is connected to the side plate 031 to form a structural space for accommodating a baffle 04. The support seat 03 forms a through hole 034 extending laterally along the tray base 1, and the baffle 04 can slide laterally along the through hole 034.

[0051] The baffle 04 has a retracted position and an extended position. Before loading and during the process of the pallet entering the container, the baffle 04 retracts inward to the pallet seat 1 to reduce the lateral space occupied by the pallet. After the pallet assembly reaches the predetermined position at the door, the baffle 04 is pushed or pulled by the pull ring 044 to extend the baffle 04 outward to the pallet seat 1.

[0052] like Figure 9 , Figure 10 and Figure 11 As shown, a locking block 042 is fixed to one side of the baffle 04, and a limiting hole 035 communicating with the through hole 034 is provided on the support base 03. The shape and position of the locking block 042 are adapted to the limiting hole 035, so that the baffle 04 can be inserted into or pass through the corresponding position when the locking block 042 and the limiting hole 035 are aligned, thus serving both as an assembly guide and a fault-prevention function. The upper plate 032 of the support base 03 is provided with a hole for the vertical insertion and removal of the limiting rod 05. When the baffle 04 extends to the working position, the locking block 042 passes through the corresponding position and forms a limiting space with the inner wall of the support base 03; after the limiting rod 05 is inserted from top to bottom, the limiting rod 05 forms a limiting engagement with the locking block 042 and the support base 03 respectively, thereby restricting the baffle 04 from retracting along the through hole 034.

[0053] A buffer block 041 is provided at one end of the baffle 04 facing the vertical frame of the container door. The buffer block 041 is preferably made of elastic material such as rubber. The buffer block 041 can be detachably fixed by fasteners, and the outer end of the fasteners does not protrude from the buffer contact surface to avoid direct contact between the metal fasteners and the vertical frame of the container. A tail plate 043 is provided at the other end of the baffle 04. The outer dimensions of the tail plate 043 are larger than the corresponding opening of the through hole 034, and a pull ring 044 is provided. The tail plate 043 facilitates manual driving of the baffle 04 and also forms a mechanical stop; when the baffle 04 is in the extended and locked state, the tail plate 043 can abut against the support seat 03, making the working position clear.

[0054] Lifting rings 06 are provided at the four corners of the pallet base 1 to facilitate lifting of the pallet using hooks, locking hooks, or slings. The support base 03 has a sloping surface 033 on the side closest to the corresponding lifting ring 06, providing clearance for lifting connectors. Forklift holes 8 or forklift support areas may also be provided on the side of the pallet base 1 to meet forklift transport needs.

[0055] like Figures 12-13 As shown, three pallets are placed inside the container. When one pallet assembly is installed at the container door, the baffle 04 extends, and its outer end enters or abuts the mating area of ​​the container door end vertical bar 07. The container door end vertical bar 07 is part of the door frame load-bearing skeleton. When the pallet tends to displace towards the container door due to vehicle operation or braking, the force is transmitted sequentially through the pallet base 1, support base 03, and baffle 04 to the vertical bar 07. The buffer block 041 buffers the contact impact, thereby reducing the direct impact of the pallet base 1 on the container door. In the engineering layout design, a space of approximately 40 mm is reserved between the container door and the pallet assembly rubber pad to allow the movable baffle to enter the corresponding interlocking area of ​​the container wall.

[0056] The usage process of this embodiment can be divided into three states. First, the loading state: retract the baffle 04, and if necessary, place the limiting vertical tube 74 in the horizontal storage state to make the pallet have a smaller outer dimension, and send the pallet into the container by hoisting or forklift transport. Second, the carrying and transportation state: hoist the steel coil to the supporting area formed by the opposing inclined bracket 2, adjust the left limiting seat 41 and the right limiting seat 42 according to the width of the steel coil and lock them, so that the vertical plate 76 restricts the axial movement of the steel coil; after the pallet is assembled in place, extend the baffles 04 on both sides and insert the limiting rod 05 to lock them, so that the baffle 04 and the vertical frame at the door end form a force-bearing cooperation. Third, the empty stacking state: after unloading, pull out the limiting rod 05 and retract the baffle 04, release the positioning shaft 62 and flip the vertical tube 74 to the horizontal storage position, and then use the stacking space at the bottom of the pallet base 1 to nest and stack multiple pallets.

[0057] Specifically, this embodiment has at least the following beneficial effects:

[0058] 1. The load path at the door end is optimized. After the baffle 04 extends, it preferentially cooperates with the vertical frame of the container door end, so that the longitudinal force of the door end pallet towards the door is borne by the rigid door frame frame, reducing the possibility of the pallet seat 1 directly impacting the door, which helps to reduce the risk of door deformation, abnormal opening and closing, and seal damage.

[0059] 2. Balancing packing maneuverability and transport locking reliability. The baffle 04 retracts during the packing stage and extends laterally after reaching its position; the locking block 042, the limiting hole 035, and the limiting rod 05 form a mechanical lock, which not only prevents the baffle 04 from retracting on its own under transport vibration, but also provides anti-mispacking protection through the directional cooperation between the locking block 042 and the limiting hole 035.

[0060] 3. The door end contact is cushioned. The buffer block 041 is located between the baffle 04 and the vertical frame of the door end, which transforms the rigid metal collision into a contact with elastic cushioning, and reduces the risk of the fastener directly scraping the frame through the recessed fastener.

[0061] 4. The carrying pallet can accommodate steel coils of different widths. The left limit seat 41 and the right limit seat 42 move along the middle rod 3 and are positioned by the insert shaft 51, and the limit spacing can be changed according to the axial dimension of the steel coil; the vertical plate 76 provides a large lateral contact area, and the reinforcing rib 77 improves its bending resistance.

[0062] 5. The limiting function and the stacking function are compatible with each other. The vertical tube 74 is vertically limited during transportation and flipped to a storage state that is basically parallel to the middle rod 3 when unloaded; together with the frame-type stacking of the tray base 1, it can reduce the interference of the protruding structure on the nesting of the upper and lower trays.

[0063] 6. The frame-type platform base balances load-bearing capacity and turnover efficiency. The central beam 11, auxiliary beam 12, and rectangular frame form a stable force path while retaining stacking space; the forklift reinforcement structure, lifting ring 06, and drainage holes are adapted to the needs of forklift transportation, lifting, and use in open-air or cleaning environments.

[0064] 7. The system can perform functional division of labor according to the container location and steel coil specifications. The door end pallet is responsible for longitudinal force transmission and protection at the door end, while the load-bearing pallet is responsible for supporting and laterally limiting steel coils of different specifications, thereby enabling multiple pallets in the limited space inside the container to form a coordinated steel coil transportation support system.

[0065] Furthermore, in the overall container layout design, the measured internal dimensions of the container are approximately 5892 mm × 2340 mm; steel coils with a diameter of approximately 1200 mm or more can be placed in the higher, mid-range load-bearing positions, while steel coils with a diameter of approximately 1000 mm can be placed at the front and door ends. This overall layout demonstrates that different load-bearing positions can be configured based on the steel coil diameter and center of gravity. The core of the pallet assembly described in this invention lies in the aforementioned stackable, adjustable limiting, and door-end telescopic locking structure, the specific length, height, and number of steel coils combined can all be adjusted according to the actual transportation plan.

[0066] The terms "lateral," "longitudinal," and "vertical" in the above embodiments refer to the usage state after the pallet is loaded into the container. The longitudinal direction roughly corresponds to the length of the container, and the lateral direction roughly corresponds to the width of the container. Any equivalent substitutions or conventional adjustments to the shape, connection method, material, and size of components without departing from the technical concept defined in the claims of this invention should fall within the protection scope of this invention.

[0067] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A tray assembly, comprising a tray base (1) and a slanted bracket (2) disposed on the tray base (1), characterized in that: The tray base (1) is a frame structure with a stacking clearance space at the bottom for inserting another tray support structure; a middle rod (3) is provided in the middle of the tray base (1), and a limiting seat is slidably provided on the middle rod (3). The limiting seat can be adjusted and locked along the middle rod (3), and the limiting seat has a limiting member for limiting the axial movement of the steel coil. The limiting member can switch between a vertical limiting state and a horizontal storage state; a support base (03) is provided on the door end side of the tray base (1), and a through hole (034) extending laterally along the tray base is provided in the support base (03). A baffle (04) is slidably disposed within the hole (034), the baffle (04) being movable between a retracted position and an extended position; the baffle (04) is provided with a locking block (042), and the support base (03) is provided with a limiting hole (035) for the locking block (042) to pass through and a limiting rod (05); when the baffle (04) is in the extended position, the end of the baffle (04) extends out of the side edge of the plate seat and cooperates with the vertical frame of the container door end, and the limiting rod (05) is inserted into the limiting space formed between the locking block (042) and the support base (03) to restrict the movement of the baffle (04).

2. The pallet assembly according to claim 1, characterized in that: The tray (1) includes a rectangular frame, a middle beam (11) and an auxiliary beam (12) connecting the middle beam (11) and the rectangular frame. The rectangular frame, the middle beam (11) and the auxiliary beam (12) form a spatial bearing structure and together constitute the stacking clearance space.

3. The pallet assembly according to claim 1, characterized in that: The inclined bracket (2) includes a left plate (21) and a right plate (22). The left plate (21) and the right plate (22) are connected to form a triangular support structure. The supporting inclined surfaces of the two inclined brackets (2) supporting the same steel coil are arranged facing each other.

4. The pallet assembly according to claim 3, characterized in that: A connecting rod (23) is provided between two inclined brackets (2) supporting the same steel coil. The connecting rod (23) makes the two inclined brackets (2) form an integral force-bearing structure, and a buffer pad is provided on the supporting surface of the inclined brackets (2).

5. The pallet assembly according to claim 1, characterized in that: The limiting seat includes a sliding sleeve (71) sleeved on the outside of the intermediate rod (3). The intermediate rod (3) is provided with multiple sets of insertion holes (52) along its length. The sliding sleeve (71) is fixed in place with the corresponding insertion hole (52) through the insertion shaft (51).

6. The pallet assembly according to claim 5, characterized in that: The limiting seat includes a left limiting seat (41) and a right limiting seat (42) arranged opposite to each other. The left limiting seat (41) and the right limiting seat (42) move along the middle rod (3) respectively to adjust the limiting distance to adapt to steel coils of different widths.

7. The pallet assembly according to claim 5, characterized in that: The limiting component includes a vertical tube (74) connected to the sliding sleeve (71) via a hinge shaft (61), the vertical tube (74) being kept in a vertical limiting state via a positioning shaft (62); a vertical plate (76) is provided on the vertical tube (74), and a reinforcing rib (77) is provided between the vertical plate (76) and the vertical tube (74).

8. The pallet assembly according to claim 7, characterized in that: After the positioning shaft (62) is released, the vertical tube (74) can rotate around the hinge shaft (61) to a horizontal storage state that is basically parallel to the middle rod (3), and the fixing block (72) is provided with rounded corners (73) and the vertical tube (74) is provided with cuts (75) to form a rotation avoidance structure.

9. The pallet assembly according to claim 1, characterized in that: The support base (03) is provided in two locations at the two door corner areas of the plate base (1); the baffle (04) is provided with a buffer block (041) at one end facing the vertical frame of the container door, and a tail plate (043) and a pull ring (044) for driving the baffle (04) to move at the other end.

10. The tray assembly according to any one of claims 1-9, characterized in that: It can switch between the boxed state, the steel coil carrying transportation state and the empty stacking state. In the boxed state, the baffle (04) is retracted. In the transportation state, the baffle (04) is extended and locked and the limiting part is in the vertical limiting state. In the empty stacking state, the limiting part is in the storage state and the pallet is nested and stacked by stacking to make room.

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