Table trolley capable of movably limiting

Abstract

The table trolley capable of being movably limited comprises a frame body, the frame body is provided with an opening used for lateral loading and unloading of workpieces, the frame body comprises a base, stand columns arranged at the four corners of the base and a cross beam connected with the stand columns, and a plurality of damping trundles are installed at the bottom of the base; the luggage carrier comprises a first luggage carrier body vertically arranged on the base and a plurality of second luggage carrier bodies horizontally arranged in the frame body, and the second luggage carrier bodies are arranged in a layered mode in the vertical direction to form a multi-layer containing space; one end of each second carrier is hinged to the stand column and can be overturned upwards; the limiting mechanism is arranged at the hinged end of the second carrier, and the limiting mechanism is used for enabling the second carrier to be in a movable state or a locked state; and the clamping seat group is arranged on the first carrier and the second carrier, and is provided with a limiting groove matched with the edge of a workpiece.

Description

A movable and limited logistics trolley Technical Field

[0001] This utility model relates to the field of logistics and transportation technology, specifically to a movable and limited logistics trolley. Background Technology

[0002] Logistics trolleys originated from production and transportation needs. Also known as cargo trolleys or cage trolleys, they are unit mobile container equipment equipped with casters for transporting and storing materials. They are commonly used in logistics distribution or for material handling between factory processes.

[0003] Traditional trolleys have enclosed sides or allow workpieces to be accessed only from the top, making workpiece loading and unloading inconvenient. In many production processes, replenishing materials at the line or unloading finished products requires operation from the side of the trolley. In traditional logistics trolleys, the carrying layers are usually fixed or movable as a whole, lacking the ability to independently access workpieces in specific locations. When workpieces need to be retrieved from the lower layer or inside the trolley, operators often need to move or remove all workpieces from the upper layer or external locations to obtain operating space. This not only complicates operations and increases labor intensity but also reduces retrieval efficiency, making it unsuitable for line-side workstations requiring rapid replenishment. Once a workpiece is placed on a carrying layer, the entire layer must be emptied or removed before workpieces can be retrieved from the lower layer, resulting in low loading and unloading efficiency and potential secondary handling damage to workpieces, as well as poor flexibility. Existing edge stops or baffles on the carrying racks are mostly fixed structures, lacking flip-lock and unlock switching functions; even in the few detachable baffle solutions, tools or complex disassembly and assembly procedures are required, hindering rapid loading and unloading. When faced with workpieces of different shapes and sizes, the fixed load layer and limiting components are difficult to adjust quickly or rotate in sections, requiring the replacement of the entire load layer or accessories. Summary of the Invention

[0004] In order to overcome the technical defects of unstable workpiece positioning and inconvenient loading and unloading operations in the existing technology, this utility model provides a logistics trolley with movable limit.

[0005] To solve the above problems, this utility model is implemented according to the following technical solution:

[0006] The movable and limitable logistics trolley of this utility model includes:

[0007] The frame body has an opening for lateral loading and unloading of workpieces. The frame body includes a base, uprights placed at the four corners of the base, and crossbeams connecting the uprights. Multiple shock-absorbing casters are installed at the bottom of the base.

[0008] The storage rack includes a first storage rack vertically mounted on a base and multiple second storage racks horizontally mounted inside the frame body. The multiple second storage racks are arranged in layers along the vertical direction to form multiple storage spaces. One end of each second storage rack is hinged to the column and can be flipped upwards.

[0009] A limiting mechanism is provided at the hinge end of the second shelf, and the limiting mechanism is used to put the second shelf in an active state or a locked state.

[0010] A card holder assembly is disposed on the first and second carriers and has a limiting groove adapted to the edge of the workpiece.

[0011] Preferably, the card holder assembly includes a bottom supporting card holder and a lateral limiting card holder;

[0012] The bottom support bracket is installed on the upper surface of the first carrier and is provided with an upward-opening limiting groove to fit the bottom surface of the workpiece.

[0013] The lateral limiting bracket is installed on the top or bottom of the second rack;

[0014] The lateral limiting seat installed at the bottom of the second carrier has a limiting groove with an opening facing downwards to fit the upper edge of the workpiece; the lateral limiting seat installed at the top of the second carrier has a limiting groove with an opening facing upwards to fit the lower edge of the workpiece.

[0015] Preferably, the second rack includes a frame and several strip connecting plates. The frame is used to install a lateral limiting bracket. One end of each strip connecting plate is fixedly connected to the frame, and the other end is provided with a straight groove. The straight groove is hinged to the limiting mechanism.

[0016] The limiting mechanism includes a receiving block, a hinge, and a limiting lock disposed on the column. The receiving block is used to support or limit the movement during the flipping of the second rack.

[0017] One end of the hinge is fixedly connected to the column, forming the flipping axis of the second shelf, so that the second shelf can flip upward. The other end of the hinge is provided with a limiting part, and the straight groove is provided between the column and the limiting part.

[0018] Preferably, the limiting lock includes a plug portion fixed to the column and a pin shaft that cooperates with the plug portion;

[0019] When the pin shaft is engaged with the insertion part, one end of the pin shaft abuts against the second shelf.

[0020] Preferably, the other end of the strip connecting plate has a right-angle portion and a rounded portion, and the rounded portion forms the flipping trajectory of the second shelf;

[0021] When the straight slot engages with the hinge, the pin disengages from the insertion part, causing the second shelf to be in a movable state, and the second shelf flips upward along the arc part;

[0022] When the limiting mechanism limits the second shelf, the receiving block abuts against the strip connecting plate and cooperates with the right-angle portion, locking the second shelf.

[0023] Preferably, the inner surface of the limiting groove is provided with anti-slip texture.

[0024] Preferably, both the bottom support bracket and the side limiting bracket adopt a hollow design, and the bracket assembly is made of polyurethane material.

[0025] Preferably, the shock-absorbing caster includes:

[0026] The wheel body is made of highly elastic rubber material;

[0027] A shock absorber is disposed between the bottom of the frame body and the wheel body.

[0028] Preferably, it also includes a traction mechanism:

[0029] The traction mechanism is mounted on the frame body, and the traction mechanism includes a traction hook and a pin. The traction hook is mounted on the frame body via the pin.

[0030] Preferably, each of the four columns is provided with a positioning part at its top, and the lower end of the base is provided with a stacking positioning foot. The stacking positioning foot is a rectangular block structure, and a positioning groove is provided at the center of the bottom of the stacking positioning foot.

[0031] When multiple trolleys are stacked, the positioning part of the next trolley is embedded into the positioning groove of the stacking positioning foot of the previous trolley.

[0032] Compared with the prior art, the beneficial effects of this utility model are:

[0033] This utility model provides a movable and limiting logistics trolley. By setting an opening in the main frame for lateral loading and unloading of workpieces, and in conjunction with multiple vertically layered and upward-flipping second racks, the operation of loading and unloading multiple layers of workpieces from the side of the trolley becomes more convenient, improving the efficiency of loading and unloading operations and facilitating operator use. The multiple upward-flipping second racks can move independently or partially upwards, allowing operators to selectively access workpieces at different levels, facilitating loading and unloading of workpieces at different levels. The mounting brackets on the first and second racks have limiting grooves adapted to the edges of the workpieces, providing stable support and limiting for the workpieces, helping to prevent movement during transportation and improving the stability of workpiece positioning. The limiting mechanism can hold the second racks in an active or locked state, facilitating position control of the racks during operation and transportation, further enhancing the safety and practicality of the trolley. Attached Figure Description

[0034] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0035] Figure 1 is a perspective view of a movable and limited logistics trolley according to the present invention.

[0036] Figure 2 is a perspective view of a workpiece placed on a movable and limited logistics trolley according to the present invention.

[0037] Figure 3 is a side view of a movable and limited logistics trolley according to the present invention.

[0038] Figure 4 is a schematic diagram of the second shelf of this utility model flipping upwards;

[0039] Figure 5 is a top view of a movable and limited logistics trolley according to the present invention.

[0040] Figure 6 is a side view of a stacked logistics trolley with movable limiting according to the present invention.

[0041] Figure 7 is an enlarged view of part A of this utility model;

[0042] Figure 8 is an enlarged view of part B of this utility model;

[0043] Figure 9 is an enlarged view of part C of this utility model;

[0044] In the diagram: 10-Frame body, 20-Shelf, 30-Card assembly, 40-Limiting mechanism, 50-Limiting lock; 11-Opening, 12-Base, 13-Column, 14-Beam, 15-Shock-absorbing caster, 16-Wheel, 17-Shock absorber; 21-First shelf, 22-Second shelf, 23-Frame, 24-Strip connecting plate, 25-Straight groove, 26-Right angle, 27-Arc; 31-Limiting groove, 32-Bottom support bracket, 33-Side limiting bracket; 41-Supporting block, 42-Hinge, 43-Limiting part; 51-Plug-in part, 52-Pin shaft; 60-Traction mechanism, 61-Positioning part, 62-Stacking positioning foot, 63-Positioning groove. Detailed Implementation

[0045] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0046] As shown in Figures 1 to 9, the movable and limited logistics trolley of this utility model includes:

[0047] The frame body 10 has an opening for lateral loading and unloading of workpieces. The frame body 10 includes a base 12, columns 13 placed at the four corners of the base 12, and crossbeams 14 connecting the columns 13. Multiple shock-absorbing casters 15 are installed at the bottom of the base 12.

[0048] The storage rack includes a first storage rack 21 vertically mounted on the base 12 and multiple second storage racks 22 horizontally mounted inside the frame body 10. The multiple second storage racks 22 are arranged in layers along the vertical direction to form multiple storage spaces. One end of each second storage rack 22 is hinged to the column 13 and can be flipped upwards.

[0049] The limiting mechanism 40 is located at the hinge end of the second shelf 22 and is used to keep the second shelf 22 in an active or locked state.

[0050] The card holder assembly 30 is disposed on the first carrier 21 and the second carrier 22, and has a limiting groove 31 adapted to the edge of the workpiece.

[0051] The frame body 10 is the main support structure of the trolley and has an opening for lateral loading and unloading of workpieces.

[0052] In a preferred embodiment, the frame body 10 includes a base 12, a plurality of uprights 13 vertically arranged at the four corners of the base 12, and a plurality of crossbeams 14 connected between the uprights 13.

[0053] The columns 13 and beams 14 are connected by welding or other means to form a rectangular frame structure. An opening may be located on one long side of the frame body 10, for example, by not providing beams 14 on that side or (optionally, by providing an openable side door). In one embodiment, the frame body 10 may be constructed entirely of Q235 steel square tubing or rectangular tubing, typically using Q235 square tubing with a hollow interior.

[0054] The base 12 is the bottom structure of the main frame 10, and multiple shock-absorbing casters 15 are installed on its bottom. One shock-absorbing caster 15 is installed at each of the four corners of the base 12, and the casters can be fixed to the base 12 by bolts or threads. The shock-absorbing casters 15 can absorb ground vibrations and allow the trolley to move smoothly on the ground.

[0055] The rack is used to support workpieces. The rack includes a first rack 21 vertically mounted on the base 12 and a plurality of second racks 22 horizontally mounted inside the frame body 10.

[0056] The first shelf 21 is a frame or support structure fixed above the base 12 for supporting the bottommost workpiece.

[0057] Multiple second-level shelves 22 are arranged in layers along the vertical direction to form a multi-layer workpiece accommodating space.

[0058] Optionally, two or more layers of second shelves 22 can be set, with the second shelves 22 arranged horizontally at different heights of the frame body 10.

[0059] Each of the plurality of second shelves 22 has one end hinged to a column 13 and is capable of flipping upwards. For example, one side of a second shelf 22 is connected to an adjacent column 13 via one or more limiting mechanisms 40 (as shown in Figures 1 and 7), forming a flipping axis. This allows the other end of the second shelf 22 to rotate upwards about the axis, thereby opening up the access space below or inside.

[0060] A limiting mechanism 40 is located at one end of the second shelf 22, and the second shelf 22 is movably connected to the upright 13 through the limiting mechanism 40. The limiting mechanism 40 is used to keep the second shelf 22 in an active or locked state.

[0061] In one embodiment, the limiting mechanism 40 can be integrated at the connection between the second shelf 22 and the column 13, and is located at the hinged connection. This mechanism can keep the second shelf 22 in an active state when it needs to be flipped, or lock it in place when the shelf is in a horizontal position to prevent accidental flipping or movement.

[0062] Optionally, the specific structure of the limiting mechanism 40 may include, but is not limited to, sliding mating parts, latches, locking parts, etc., and the switching of states and the fixing of positions are achieved through the cooperation of these parts.

[0063] To enhance workpiece positioning and anti-slip performance, a bracket assembly 30 is installed on the first carrier 21 and each of the second carriers 22. Specifically, the bracket assembly 30 is used for positioning and supporting the workpiece. The bracket assembly 30 is disposed on the first carrier 21 and the second carrier 22 and has a limiting groove 31 adapted to the edge shape of the workpiece. The bracket assembly 30 can be made of polyurethane material and is fixed to the corresponding position on the carrier by bolts or other means. The shape and size of the limiting groove 31 are customized according to the shape of the workpiece being supported to ensure that the workpiece can fit snugly into the limiting groove 31 when placed in it, achieving positioning and support.

[0064] Components not described in detail in this embodiment are all conventional components well known to those skilled in the art. The scope of protection of this utility model is not limited to the above preferred embodiments. Any equivalent substitutions or improvements based on the technical solution of this utility model should be included within the scope of protection of this utility model.

[0065] In a preferred embodiment, as shown in Figures 2, 3, and 4.

[0066] Loading: Place the lower layer workpiece on the second carrier 22 and insert the pin shaft 52 to lock it; similarly, load the workpieces of each layer and area in sequence.

[0067] To remove the workpiece from the lower layer: If you need to remove the workpiece from the third layer, simply remove the pin 52 from the corresponding area unit of the second layer covered above, flip the second carrier 22 of that unit to a vertical position, expose the workpiece from the third layer, and remove it directly from the side opening without moving other areas or the entire layer.

[0068] Reset: After the item is retrieved, return the second shelf 22 to the horizontal position and insert the pin shaft 52 to lock it.

[0069] Similarly, when it is necessary to retrieve the IV layer, simply flip the second shelf 22 on the I layer.

[0070] The above embodiments are merely illustrative of a preferred implementation of the present invention and are not intended to limit the scope of the present invention.

[0071] Preferably, the card holder assembly 30 includes a bottom supporting card holder 32 and a lateral limiting card holder 33;

[0072] The bottom support bracket 32 ​​is installed on the upper end face of the first carrier 21 and is provided with an upward-opening limiting groove 31 to fit the bottom surface of the workpiece.

[0073] The lateral limiting bracket 33 is installed on the top or bottom of the second shelf 22;

[0074] The lateral limiting seat 33 installed at the bottom of the second carrier 22 is provided with a limiting groove 31 with an opening facing downward to fit the upper edge of the workpiece; the lateral limiting seat 33 installed at the top of the second carrier 22 is provided with a limiting groove 31 with an opening facing upward to fit the lower edge of the workpiece.

[0075] The card holder assembly 30 is disposed on the first carrier 21 and the second carrier 22, and each card holder unit has a limiting groove 31 adapted to the shape of the workpiece edge. The card holder assembly 30 includes a bottom supporting card holder 32 and a lateral limiting card holder 33.

[0076] Bottom support brackets 32 are mounted on the upper surface of the first shelf 21 and are specifically designed to support the bottom of the workpiece located on the lowest layer (on the first shelf 21). Each bottom support bracket 32 ​​has an upward-opening limiting groove 31, the shape and size of which are adapted to the bottom contour of the workpiece. For example, the bottom support bracket 32 ​​can be designed as a block structure made of polyurethane material, which is firmly fixed to the support beam of the first shelf 21 by bolts, and the limiting groove 31 at its top can fit against the protrusion or edge of the bottom of the workpiece.

[0077] The lateral limiting bracket 33 is mainly used for lateral positioning and restriction of workpieces located at different levels, preventing them from moving laterally or swinging during transportation or operation. The lateral limiting bracket 33 is installed on the top or bottom of the second carrier 22.

[0078] Specifically, the lateral limiting brackets 33 installed at the bottom of the second shelf 22 are typically located below the second shelf 22, and their limiting grooves 31 have an opening facing downwards. The shape of the limiting grooves 31 of these brackets is adapted to the upper edge contour of the workpiece carried below (i.e., the workpiece located on the next shelf). When the workpiece below is placed in position, these downward-opening limiting grooves 31 will engage the upper edge of the workpiece from above, providing downward pressure and lateral restraint.

[0079] Lateral limiting brackets 33, mounted on top of the second shelf 22, are typically positioned above the second shelf 22, with their limiting grooves 31 opening upwards. The limiting grooves 31 of these brackets are shaped to fit the lower edge contour of the workpiece carried below (i.e., the workpiece located above the second shelf 22). Once the upper workpiece is in place, these upward-opening limiting grooves 31 support or engage the lower edge of the workpiece from below, providing upward support and lateral constraint.

[0080] As shown in Figure 6, specifically: when placing a workpiece on the trolley, the bottommost workpiece is first placed on the first shelf 21. The bottom contour of the workpiece falls into the upward-opening limiting groove 31 of the bottom support bracket 32, obtaining initial bottom support and positioning. Next, when placing workpieces on upper shelves, for example, placing a workpiece on a second shelf 22, the side of the workpiece is constrained by the lateral limiting bracket 33 provided on the second shelf 22. At the same time, its lower edge is supported and locked by the upward-opening limiting groove 31 of the lateral limiting bracket 33 provided at the bottom of the adjacent second shelf 22 above, while its upper edge is engaged and constrained by the downward-opening limiting groove 31 of the lateral limiting bracket 33 provided at the top of the adjacent second shelf 22 below. Through the combined action of the bottom support bracket 32 ​​and the lateral limiting bracket 33 at different levels and positions, the workpiece is stably supported and limited at multiple points from below, above, and sides, ensuring that the workpiece will not be misaligned during the movement and flipping of the trolley. The brackets can be made of wear-resistant materials with certain cushioning properties, such as polyurethane, to better protect the workpiece surface.

[0081] Preferably, the second shelf 22 includes a frame 23 and several strip connecting plates 24. The frame 23 is used to install the lateral limiting card seat 33. One end of the strip connecting plate 24 is fixedly connected to the frame 23, and the other end is provided with a straight groove 25. The straight groove 25 is hinged to the limiting mechanism 40.

[0082] As shown in Figure 1, the limiting mechanism 40 includes a receiving block 41, a hinge 42 and a limiting lock 50 provided on the column 13. The receiving block 41 is used to support or limit the second shelf 22 during the flipping process.

[0083] One end of the hinge 42 is fixedly connected to the column 13, forming the flipping axis of the second shelf 22, so that the second shelf 22 can flip upward. The other end of the hinge 42 is provided with a limiting part 43, and a straight groove 25 is provided between the column 13 and the limiting part 43.

[0084] The second shelf 22 is a horizontally arranged load-bearing layer inside the frame body 10, used to accommodate workpieces in layers. Each second shelf 22 includes a frame 23 and several strip connecting plates 24. The frame 23 forms the peripheral frame of the shelf and is used to install lateral limiting brackets 33. One end of the strip connecting plates 24 is fixedly connected to the frame 23 by welding. The other end of the strip connecting plate 24 is the part where the second shelf 22 connects to the column 13, and a straight slot 25 is provided at this end.

[0085] The limiting mechanism 40 is located at this end of the second shelf 22 and is movably connected to the second shelf 22 through the straight slot 25. The limiting mechanism 40 is installed on the column 13 of the frame body 10 and cooperates with the second shelf 22 to control the flipping movement and state of the shelf.

[0086] As shown in Figure 7, the limiting mechanism 40 includes a receiving block 41, a hinge 42, and a limiting lock 50, all mounted on the column 13.

[0087] The receiving block 41 is a component fixed to the side of the column 13, for example, by welding or bolting. The receiving block 41 provides support or limits the second shelf 22 at a specific angle during its upward or downward flipping. More specifically, the receiving blocks 41 include two transverse receiving blocks 41, one fixed to the inner side of the column 13 and the other fixed to the outer side of the column 13, specifically the inner side and outer side of the frame body 10. When the second shelf 22 is flipped to a specific position, the corresponding part of the strip connecting plate 24 or the frame 23 abuts against the receiving block 41.

[0088] The hinge 42 is a key component for enabling the second shelf 22 to flip. One end is fixedly connected to the column 13, and the hinge 42 can be a pin or a bolt. The hinge 42 forms the axis around which the second shelf 22 flips upward, allowing the entire second shelf 22 to flip around this axis. The other end of the hinge 42 is provided with a limiting part 43, such as a protruding nut of a pin or bolt.

[0089] A straight slot 25 is located between the upright 13 and the limiting part 43 of the hinge 42. The straight slot 25 on the strip connecting plate 24 fits onto the limiting part 43, allowing the straight slot 25 to slide within a limited range between the limiting part 43 and the upright 13. This fit guides the flipping trajectory of the second shelf 22 and works with the receiving block 41 to jointly achieve the flipping of the shelf and its limiting position at a specific angle. For example, when the second shelf 22 flips upward, the straight slot 25 at the end of the strip connecting plate 24 slides a distance along the limiting part 43 of the hinge 42, thus fixing the flipped state.

[0090] The limit lock 50 is also included in the limit mechanism 40 (as previously described) for locking the second shelf 22 in a horizontal folded position when needed.

[0091] As shown in Figures 3 and 4, in one operational scenario: when an operator needs to retrieve a workpiece from a lower shelf of the second shelf 22, first ensure that the limit lock 50 is unlocked. Then, grasp the end of the second shelf 22 that is not connected to the upright 13 and lift it upwards. At this time, the second shelf 22 will begin to flip upwards around the hinge 42. During the flipping process, the straight groove 25 at the end of the strip connecting plate 24 will slide on the limiting part 43 of the hinge 42 and be guided and supported by the receiving block 41. When the second shelf 22 is fully flipped up and may reach a vertical or near-vertical position, it can remain in this position, thereby exposing the workpiece in the lower shelf for easy access by the operator. After the access is completed, flip the second shelf 22 back down to the horizontal position and lock it again using the limit lock 50.

[0092] As shown in Figure 7, preferably, the limit lock 50 includes a plug portion 51 fixed on the column 13 and a pin shaft 52 that cooperates with the plug portion 51.

[0093] When the pin 52 is engaged with the insertion part 51, one end of the pin 52 abuts against the second shelf 22.

[0094] The connector 51 is a structural component mounted on the side of the upright 13 of the frame body 10. Optionally, it is a metal bracket with holes, U-grooves, or snap fasteners. The connector 51 is fixed to the upright 13 by welding, and its position is such that the second shelf 22 can be aligned with the pin shaft 52 when in a horizontal position.

[0095] The pin 52 is a locking element movable relative to the insertion part 51. Optionally, it is a cylindrical metal pin, a handle-equipped rod, or a rotating convex shaft. The pin 52 engages with the insertion part 51 to achieve locking and unlocking operations, for example, by sliding, rotating, or inserting.

[0096] When the pin 52 is engaged with the insertion part 51, the limit lock 50 is in a locked state. In this state, one end of the pin 52 abuts against a part of the second shelf 22, such as the edge of the shelf frame, a specially designed locking hole, or a connecting plate. The abutment of the pin 52 against the second shelf 22 prevents the shelf from rotating around the rotation axis, thereby firmly fixing the shelf in its current position, such as a horizontal position.

[0097] As shown in Figures 3 and 4, in one operational scenario: after loading the workpiece and retracting all the second racks 22, the operator pushes the pin shaft 52 to insert it into the connector 51 on the column 13. When the pin shaft 52 is fully inserted and engaged with the connector 51, the end of the pin shaft 52 will precisely lock or abut against the edge of the second rack 22 closest to it. At this time, even if the trolley encounters bumps or slopes during movement, the rack will remain in a horizontal position because it is locked by the pin shaft 52, preventing accidental tipping and workpiece falling. When it is necessary to flip the rack again to access the workpiece, the operator only needs to pull out or rotate the pin shaft 52 to disengage it from the connector 51 and the rack, releasing the lock, and the rack can then be flipped upwards freely.

[0098] Preferably, the other end of the strip connecting plate 24 has a right-angle portion 26 and an arc portion 27, the arc portion 27 forming the flipping trajectory of the second shelf 22;

[0099] When the straight slot 25 engages with the hinge 42, the pin 52 disengages from the insertion part 51, causing the second shelf 22 to be in a movable state, and the second shelf 22 flips upward along the arc part 27.

[0100] When the limiting mechanism 40 limits the second shelf 22, the receiving block 41 abuts against the strip connecting plate 24 and cooperates with the right angle portion 26 to lock the second shelf 22.

[0101] The structure of the second shelf 22 further includes a frame 23 and several strip connecting plates 24. The frame 23 constitutes the main frame of the second shelf 22 and is used to install lateral limiting brackets 33 on its outer side or at appropriate locations.

[0102] The strip connecting plate 24 is a key component connecting the frame 23 and the limiting mechanism 40. One end is fixedly connected to the frame 23, for example, by welding or riveting. The other end of the strip connecting plate 24, i.e., the side closer to the column 13, has a right-angled portion 26 and an arc portion 27. The shape and size of this arc portion 27 cooperate with the hinge 42 to form the trajectory for the second shelf 22 to flip upward. A straight slot 25, an elongated slot, is also provided at the other end of the strip connecting plate 24. This straight slot 25 fits onto the hinge 42 of the limiting mechanism 40, allowing the strip connecting plate 24 to slide and rotate within a certain range on the hinge 42.

[0103] When the second shelf 22 needs to be flipped upwards, the operator releases the locking mechanism 50. The engagement between the straight slot 25 on the strip connecting plate 24 and the hinge 42 allows the pin 52 to disengage from the insertion part 51, releasing the locking constraint on the shelf. The second shelf 22 then enters a movable state and can rotate upwards along the trajectory formed by the arc part 27 under the guidance of the locking mechanism 40. The receiving block 41 provides support or guidance during the shelf flipping process.

[0104] When the second shelf 22 is flipped to a horizontal position and needs to be secured, the limiting mechanism 40 will limit it to its current position. Specifically, the right-angled portion 26 at the end of the strip connecting plate 24 abuts against the receiving block 41 provided on the column 13, and the cooperation between the two restricts the second shelf 22 from rotating further downward. Combined with the locking mechanism inside the limiting mechanism 40 (for example, by engaging with the insertion portion 51 again through the pin shaft 52), the second shelf 22 can be kept in a horizontal locked state.

[0105] Preferably, the inner surface of the limiting groove 31 is provided with anti-slip texture.

[0106] The inner surface of the limiting groove 31 on the retaining assembly 30 is provided with anti-slip texture to further improve the fixing effect on the workpiece. These anti-slip textures can be fine stripes, grids, or dot-like protrusions or grooves, and are set on the surface of the limiting groove 31 that contacts the edge of the workpiece. The retaining assembly 30 is made of polyurethane material, and these anti-slip textures can be formed directly during mold processing.

[0107] In practical applications, when a workpiece is placed in a limiting groove 31 with anti-slip texture, the anti-slip texture increases the friction between the workpiece and the holder. Even when the trolley moves, accelerates, decelerates, or encounters a slope, it can effectively prevent the workpiece from sliding or shifting in the limiting groove 31, ensuring that the workpiece always stays in the predetermined position and reducing collisions or positioning deviations caused by sliding.

[0108] Preferably, both the bottom support card holder 32 and the side limiting card holder 33 adopt a hollow design, and the card holder assembly 30 is made of polyurethane material.

[0109] In this embodiment, a preferred implementation is provided, wherein the card holder assembly 30 is made of polyurethane;

[0110] Polyurethane (PU) is a polymer compound produced by reacting polyisocyanates with polyether polyols or polyester polyols. This synthesis process allows for the production of products with various forms and properties, ranging from flexible foams to rigid plastics and elastomers, by adjusting the proportions of raw materials and reaction conditions, thus offering extremely high design flexibility.

[0111] Polyurethane was chosen as the material for the card holder assembly 30 based on its series of excellent properties, which make it ideal for securing and protecting logistics components.

[0112] 1. Excellent elasticity and cushioning performance: Polyurethane materials have good resilience, which can effectively absorb and disperse the impact and vibration generated during handling or transportation, providing good cushioning protection for the workpiece and reducing workpiece damage.

[0113] 2. High wear resistance: During repeated loading and unloading of workpieces, the receiving block 41 will be subject to a certain amount of friction. Polyurethane material has better wear resistance, which can ensure that the receiving block 41 is not easily worn during long-term use and extend the service life of the component.

[0114] 3. Good gripping force: The polyurethane surface has a certain coefficient of friction, which helps to improve the stability of the workpiece in the groove. Combined with the shape of the groove and the anti-slip texture, it can more effectively fix the workpiece and prevent it from sliding.

[0115] 4. Oil and chemical resistance: In industrial production environments, there may be contact with oil or other chemicals. Polyurethane materials have good resistance to a variety of oils and chemicals and can maintain stable performance in harsh environments.

[0116] 5. Easy to mold and process: Polyurethane can be easily made into various complex shapes through injection molding, casting and other processes to ensure a good fit with the workpiece.

[0117] Each shock-absorbing caster 15 includes a wheel body 16 and a shock absorber 17. The wheel body 16 is the part of the caster that directly contacts the ground and is made of highly elastic rubber. This material has good elasticity and wear resistance, can adapt to different ground conditions, and reduces running noise. The shock absorber 17 is located between the bottom of the frame body 10 and the wheel body 16. The shock absorber 17 is integrated into the caster's mounting structure and connects between the bottom of the frame body 10 and the support structure of the wheel body 16. It can optionally employ a built-in spring or hydraulic device. When the trolley travels on uneven ground, the shock absorber 17 can absorb and buffer the impact and vibration from the ground, reducing the vibration transmitted to the frame body 10 and the load rack, thereby protecting the workpiece carried on the trolley from damage and making the trolley travel more smoothly.

[0118] The trolley also includes a traction mechanism 60, facilitating movement via a traction device. The traction mechanism 60 is mounted on the frame body 10, typically located at the front or rear of the trolley (e.g., at the front and rear ends of the base 12). The traction mechanism 60 includes a traction hook and a pin. The traction hook is the part that connects to external traction equipment (such as a tractor), and is made of high-strength steel, for example, in the shape of a standard connecting hook. The traction hook is movably mounted on a connecting seat on the frame body 10 via the pin. The pin acts as the rotation axis of the traction hook, allowing it to swing within a certain angle range, facilitating connection with the traction equipment and adapting to angle changes during traction. In factory logistics, multiple such logistics trolleys can be connected to form a train via the traction mechanism 60, and centrally pulled by a single tractor, improving material handling efficiency.

[0119] To facilitate the stacking and storage of multiple trolleys, the frame body 10 and base 12 are designed with a specialized stacking structure. Each of the four uprights 13 has a positioning part 61 at its top. The positioning part 61 can be a protruding columnar, conical, or block-shaped structure, made of steel and welded to the top of the upright 13. The lower end of the base 12 also has stacking positioning feet 62. A stacking positioning foot 62 is located at each of the four corners of the base 12. The stacking positioning foot 62 is a rectangular block structure with a concave center at the bottom, welded from steel, and its dimensions match the cross-section of the uprights 13 and base 12. Each stacking positioning foot 62 has a positioning groove 63 at its center. When multiple trolleys are stacked, the stacking positioning foot 62 of the previous trolley will fall onto the top of the upright 13 of the next trolley. At this time, the positioning part 61 at the top of the upright 13 of the next trolley will embed into the positioning groove 63 at the bottom of the stacking positioning foot 62 of the previous trolley. This embedded structure effectively prevents the stacking trolleys from sliding laterally or longitudinally, ensuring the stability and safety of the stack and facilitating the storage of trolleys in limited space.

[0120] In summary, in this utility model, the frame body is constructed from welded square or rectangular tubing, with an opening for lateral loading and unloading of workpieces, and shock-absorbing casters installed at the bottom. The carrying rack includes a vertically arranged first carrying rack and multiple horizontally layered second carrying racks. Each second carrying rack consists of a frame and strip connecting plates. The ends of the strip connecting plates are provided with straight grooves, right angles, and arcs, and are hinged to a limiting mechanism mounted on a column, allowing for upward flipping and movement or locking. The limiting mechanism includes a receiving block, a hinge, and a limiting lock mounted on the column. The cooperation of these components enables the carrying rack to be flipped, angle-limited, and locked. A bracket assembly is installed on the first and second carrying racks, including a bottom supporting bracket and a lateral limiting bracket. Made of materials such as polyurethane, it has limiting grooves adapted to the shape of the workpiece and anti-slip textures on the inner surface, and is fixed by bolts or other means. The shock-absorbing casters include a wheel body and a shock absorber located between the bottom of the frame body and the wheel body. The traction mechanism is typically installed at both ends of the frame body, including a traction hook mounted on a connecting seat via a pin. A positioning part is located at the top of the column, and stacking positioning feet with positioning grooves are located below the base for stacking and positioning multiple trolleys. The specific structure of this invention makes it more practical in warehouse management.

[0121] The working principle of the movable and limiting logistics trolley described in this utility model is as follows: When loading or unloading workpieces, the trolley can be operated from its side with a lateral opening, facilitating use in scenarios such as production line work. For workpieces located at different levels, especially those in the upper or lower layers, operators can open the access channel by flipping the corresponding second rack upwards. Multiple second racks are arranged vertically in layers to form a multi-layered accommodating space. One end of each second rack is hinged to a column, allowing it to rotate upwards around the hinge point. A limiting mechanism is located at the hinge end of the second rack and is movably connected to the column. This mechanism controls the state of the second rack. When loading or unloading operations are required, the limiting mechanism keeps the second rack in a movable state, allowing it to flip upwards and expose the workpiece below or inside. After the operation is completed, the limiting mechanism locks the second rack in a horizontal position, ensuring the stability of the trolley when moving or stationary and preventing the rack from accidentally flipping or moving. Because each second rack can be independently flipped, selective access to workpieces in specific layers or areas can be achieved without moving or clearing all workpieces on the entire rack level. Workpieces placed on the racks are positioned and supported by clamping assemblies located on the first and second racks. These clamping assemblies have limiting grooves adapted to the shape of the workpiece edges, ensuring a close fit to the workpiece's contours and providing reliable support and lateral restraint. This prevents the workpiece from sliding, shifting, or colliding during trolley movement, acceleration, deceleration, or turning, ensuring positioning accuracy and safety. Shock-absorbing casters mounted on the bottom of the trolley provide basic mobility, allowing it to move freely within the work area.

[0122] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A movable and limitable logistics trolley, characterized in that, include: The frame body has an opening for lateral loading and unloading of workpieces. The frame body includes a base, uprights at the four corners of the base, and crossbeams connecting the uprights. Multiple shock-absorbing casters are installed at the bottom of the base. A carrying rack includes a first carrying rack vertically mounted on the base and multiple second carrying racks horizontally disposed inside the frame body. The multiple second carrying racks are arranged in layers along the vertical direction to form multiple accommodating spaces. One end of each second carrying rack is hinged to the uprights and can be flipped upwards. A limiting mechanism is located at the hinged end of the second carrying rack and is used to keep the second carrying rack in an active or locked state. A card holder assembly is disposed on the first and second carrying racks and has a limiting groove adapted to the edge of the workpiece.

2. The movable and limited logistics trolley according to claim 1, characterized in that: The card holder assembly includes a bottom support card holder and a side limiting card holder; the bottom support card holder is installed on the upper end face of the first carrier and has an upward-opening limiting groove adapted to the bottom surface of the workpiece; the side limiting card holder is installed on the top or bottom of the second carrier; wherein, the side limiting card holder installed on the bottom of the second carrier has a downward-opening limiting groove adapted to the upper edge of the workpiece; the side limiting card holder installed on the top of the second carrier has an upward-opening limiting groove adapted to the lower edge of the workpiece.

3. The movable and limited logistics trolley according to claim 1, characterized in that: The second shelf includes a frame and several strip connecting plates. The frame is used to install lateral limiting brackets. One end of each strip connecting plate is fixedly connected to the frame, and the other end is provided with a straight groove. The straight groove is hinged to the limiting mechanism. The limiting mechanism includes a receiving block, a hinge, and a limiting lock provided on the column. The receiving block is used to support or limit the second shelf during the flipping process. One end of the hinge is fixedly connected to the column, forming the flipping axis of the second shelf, so that the second shelf can flip upward. The other end of the hinge is provided with a limiting part, and the straight groove is provided between the column and the limiting part.

4. The movable and limited logistics trolley according to claim 3, characterized in that: The limiting lock includes a plug portion fixed to the column and a pin shaft that cooperates with the plug portion; when the pin shaft is plugged into the plug portion, one end of the pin shaft abuts against the second shelf.

5. A movable and limited logistics trolley according to claim 3, characterized in that: The other end of the strip connecting plate has a right-angle portion and an arc portion, the arc portion forming the flipping trajectory of the second shelf; when the straight slot engages with the hinge, the pin shaft disengages from the insertion portion, causing the second shelf to be in a movable state, and the second shelf flips upward along the arc portion; when the limiting mechanism limits the second shelf, the receiving block abuts against the strip connecting plate and engages with the right-angle portion, locking the second shelf in a locked state.

6. A movable and limited logistics trolley according to claim 2, characterized in that: The inner surface of the limiting groove is provided with anti-slip texture.

7. A movable and limited logistics trolley according to claim 2, characterized in that: Both the bottom support bracket and the side limiting bracket adopt a hollow design, and the bracket assembly is made of polyurethane material.

8. A movable and limited logistics trolley according to claim 1, characterized in that, The shock-absorbing caster includes: a wheel body made of high-elasticity rubber; and a shock absorber located between the bottom of the frame body and the wheel body.

9. A movable and limited logistics trolley according to claim 1, characterized in that, It also includes a traction mechanism: the traction mechanism is installed on the frame body, and the traction mechanism includes a traction hook and a pin, the traction hook being installed on the frame body via the pin.

10. A movable and limited logistics trolley according to claim 1, characterized in that: Each of the four columns is provided with a positioning part at its top, and the lower end of the base is provided with a stacking positioning foot. The stacking positioning foot is a rectangular block structure, and the center of the bottom of the stacking positioning foot is provided with a positioning groove. When multiple trolleys are stacked, the positioning part of the next trolley is embedded into the positioning groove of the stacking positioning foot of the previous trolley.

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