Extension plate structure and trolley

Abstract

The invention relates to an extension plate structure and a trolley, and belongs to the field of transportation. An extension plate structure comprises a connecting support, the connecting support is provided with a connecting space, a first connecting notch, a second connecting notch and a mounting hole, the connecting support is matched with a trolley body through the second connecting notch, and the connecting support can be connected with the trolley body through the mounting hole; the extension assembly is arranged on the connecting support and located at the connecting space, the extension assembly is matched with the first connecting notch, and the extension assembly is provided with a third connecting notch; the mounting assembly is arranged on the extension assembly and located at the third connecting notch; and the plate piece is arranged on the mounting assembly. The invention discloses an extension plate structure which can be applied to structures such as a trolley. According to the structure, the loading space is expanded through the extension assembly, the plates can bear goods exceeding an original trolley body according to requirements, and the adaptability of the trolley to special-shaped and large-sized goods is greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of transportation, and in particular to an extension plate structure and a trolley. Background Art

[0002] In the existing technology, the trolley lacks an extension plate structure, resulting in a fixed carrying space and a single function, which makes it difficult to meet diverse transportation needs: when faced with long, wide or large items, it is impossible to adapt by expanding the carrying area. Either the items need to be transported in multiple times, increasing the number of round trips and labor intensity, or the items are forced to be suspended outside the vehicle body, which not only makes it easy for the items to fall and be damaged, but also may cause the trolley to tilt or overturn due to the shift of the center of gravity, posing a safety hazard. Summary of the Invention

[0003] Based on this, it is necessary to provide an extension plate structure and a trolley to address the problem that the trolley lacks an extension plate structure.

[0004] An extension plate structure, the extension plate structure includes: a connecting bracket, the connecting bracket is used to connect to the trolley body, the connecting bracket is provided with a connecting space; an extension component, the extension component is movably arranged on the connecting bracket and the extension component extends toward a side away from the connecting bracket, the movable connection between the extension component and the connecting bracket is located in the connecting space, and the extension component is provided with a third connecting notch; an installation component, the installation component is arranged on the extension component and is adapted to be installed in the third connecting notch, the installation component is located at one end of the extension component away from the connecting bracket; a plate, the plate is arranged on the installation component and / or the extension component.

[0005] The above discloses an extension plate structure that can be applied to structures such as trolleys. Trolleys without extension plates are limited by fixed dimensions and are difficult to carry extra-long and extra-wide items. The items are prone to exceeding the vehicle body, resulting in unstable transportation. However, this structure expands the loading space by extending the components. The panels can take on goods that exceed the original vehicle body according to demand, greatly improving the adaptability of the trolley to special-shaped and large items, avoiding the increase in the number of transportations due to loading restrictions, and improving transportation efficiency. The installation component firmly fixes the panel, and the connecting bracket is tightly connected to the trolley through the installation hole. The notch adaptation design of each component enhances the overall stability, ensuring that the goods are not easily displaced during transportation, reducing the risk of items falling, and reducing the cost of manual intervention. The connection space and the first connection notch provide precise positioning for the extension component to prevent it from shifting left and right during transportation. In conjunction with the fixing of the panel by the installation component, a stable bearing surface can be formed. Even if the transportation is bumpy, the goods are not easy to shake, solving the instability problem of traditional trolleys when loading large items. Moreover, the connection space limit extends the range of motion of the components, making the force more evenly distributed, reducing component wear, extending the overall service life of the trolley, and reducing maintenance costs. At the same time, it maintains the adaptability to goods of different specifications, allowing the trolley to continue to function stably during long-term use.

[0006] In one embodiment, the connecting bracket includes a bracket body and a connecting body. The bracket body is configured to connect to the trolley body, the connecting body being mounted on the bracket body, and the extension assembly being mounted on the connecting body. By placing the connecting body on the bracket body, the bracket body is focused on connecting to the trolley body, enhancing overall stability through a more compatible connection method. Compared to trolleys without an extension plate structure, this avoids the problem of loose connections when temporarily adding components. The force applied to the extension assembly when carrying cargo is evenly transferred to the trolley body through the bracket body, reducing the risk of local structural damage due to excessive force and extending the trolley's service life. The connecting body serves as a mounting support for the extension assembly, providing more precise installation and positioning. Combined with the limiting function of the connecting space, this further reduces the extent of the extension assembly's wobbling during transportation. Compared to trolleys without this design, this design more reliably ensures the safe transportation of overlong cargo, while also allowing for smoother operation of the extension assembly, reducing issues caused by component misalignment, and improving ease of use. The bracket body can be specifically adapted according to the structural characteristics of the trolley, and the connecting body ensures the installation accuracy of the extension component, so that the same extension plate structure can be applied to more types of trolleys. Compared with trolleys that lack extension plate structures and can only rely on their own fixed dimensions, it greatly expands the usage scenarios and practicality.

[0007] In one embodiment, the bracket body includes a bracket main board and a bracket side panel. The number of the bracket side panels is two. The two bracket side panels are arranged on the bracket main board and located on both sides of the bracket main board. The connecting body is arranged on the bracket main board. The bracket main board is provided with the second connecting notch and the mounting holes. The number of the mounting holes is multiple, and the multiple mounting holes are distributed around the second connecting notch. By arranging the two bracket side panels on both sides of the bracket main board, the bracket side panels on both sides can form a stable support for the bracket main board from the lateral direction, greatly enhancing the overall rigidity and torsional resistance of the bracket body, effectively avoiding deformation problems when carrying heavy objects or being impacted by external forces, and providing a solid foundation for the stable installation of the connecting body and subsequent extension components and panels. The second connecting notch provided on the bracket main board can form a precise interlocking connection with the trolley body. In combination with the multiple mounting holes distributed around it, the firmness of the connection with the trolley body can be further improved through multi-point fixation, solving the problem of easy loosening and poor adaptability of the traditional single connection method. The design of multiple mounting holes distributed around the second connection notch allows the extension plate to flexibly adapt to different sizes of trolleys and other trolley bodies. Users can select the appropriate mounting point based on their actual needs, significantly expanding the product's applicability. Furthermore, the bracket mainboard and side panels are integrally molded, eliminating the gaps and stress concentration points found in traditional split-type structures. This significantly enhances the overall structural strength and deformation resistance of the bracket body, allowing it to more stably bear the weight of the extension components and panels, while effectively dissipating the impact forces generated by the trolley during movement, extending the device's service life.

[0008] In one embodiment, the connecting body includes a connecting main shell, a connecting base, and a first connecting shaft. The connecting main shell is disposed on the bracket body, and the connecting base is disposed on the connecting main shell and located on a side of the connecting base away from the bracket body. The bracket body, the connecting main shell, and the connecting base cooperate to form a connecting space. The first connecting shaft is disposed on the connecting main shell and passes through the connecting space. The extension assembly abuts against the connecting main shell and the connecting base, and the connecting base is provided with a first connecting notch. The connecting main shell, the connecting base, and the bracket body cooperate to form a connecting space, providing a stable installation environment for the extension assembly. This fixed space ensures its position is stable and will not be arbitrarily shifted by external forces during use, laying a solid foundation for subsequent load-bearing operations. The connecting main shell and the connecting base abut against the extension assembly, providing support and position restraint for the extension assembly from different directions. The connecting main shell provides side blocking to prevent the extension assembly from drifting to the sides, while the connecting base provides bottom support to prevent the extension assembly from falling downward. This dual effect allows the extension assembly to be firmly fixed in the connection space. Even if the trolley encounters bumps during driving, the extension assembly can remain stable, ensuring the safety of the load. The first connecting shaft is set on the connecting main shell and passes through the connecting space, further enhancing the fixing effect of the extension assembly. It cooperates with the connecting main shell and the connecting base plate to form a three-dimensional fixed frame, which wraps the extension assembly in all directions and limits it, greatly improving the stability and firmness of the overall structure. The first connecting notch on the connecting base plate is particularly critical to the limiting effect of the extension assembly. The precise adaptation of the first connecting notch can firmly clamp the extension assembly to prevent it from shifting in the horizontal direction. This ensures that the relative position of the extension assembly and the connecting body remains constant at all times, thereby ensuring that the extended load-bearing surface formed by the plate is flat and stable.

[0009] In one embodiment, the connecting bracket is provided with a first connecting notch, a second connecting notch and a mounting hole, the second connecting notch is used to adapt to the trolley body, the mounting hole is used to cooperate with the trolley body, and the extension assembly is adapted to the first connecting notch. The first connecting notch, the second connecting notch and the mounting hole on the connecting bracket have clear division of labor and synergy, providing key support for the adaptation and stable operation of the extension plate structure and the trolley: the second connecting notch achieves preliminary positioning of the extension plate structure and the trolley by precise adaptation to the trolley body, ensuring the accuracy of the connection direction and position of the two, laying the foundation for subsequent fixation; the mounting hole is closely matched with the trolley body through fasteners, converting the preliminary positioning into a rigid connection, avoiding loosening due to vibration during transportation, and enhancing the stability of the overall structure; and the adaptation of the first connecting notch to the extension assembly forms a precise limit for the extension assembly, preventing it from displacing in the horizontal or vertical direction.

[0010] In one embodiment, the trolley further includes a reinforcing rib, wherein the first end face of the reinforcing rib is disposed on the bracket body, and the second end face of the reinforcing rib is disposed on the connecting body. By connecting the first end face of the reinforcing rib to the bracket body and the second end face to the connecting body, a stable triangular support structure is formed. This structure effectively distributes stress at the connection between the bracket body and the connecting body, preventing deformation and loosening of the connection caused by long-term heavy loads or frequent use. Compared to structures without reinforcing ribs, the connection between the bracket body and the connecting body is more secure when transporting heavy cargo, reducing the risk of displacement of the extension assembly and tilting of the panel due to structural deformation, thereby ensuring stable cargo transportation. When the extension plate structure is added, the extension portion increases the overall load bearing capacity. The presence of the reinforcing ribs strengthens the connection between the connecting body and the bracket body, enabling the connecting body to more stably support the extension assembly and cargo on the panel, thereby increasing the load-bearing capacity of the entire extension plate structure. This not only expands the loading space of the trolley but also allows it to safely carry heavier items. Compared to structures without reinforcing ribs, this reduces the risk of component damage due to insufficient load bearing capacity, thereby extending the trolley's service life. Furthermore, the reinforcing ribs enhance the structure's impact resistance. When the trolley encounters road bumps or makes an emergency stop while driving, the extension plate structure will be subjected to a large impact force. The reinforcing ribs can buffer part of the impact force through their own rigidity, reduce the relative displacement between the bracket body and the connecting body caused by the impact, and thus ensure that the limiting effect of the first connecting notch on the extension component is not affected, ensuring that the goods on the plate are always in a stable state.

[0011] In one embodiment, the connecting brackets are multiple. By providing multiple connecting brackets, they can be connected to the trolley from different locations, creating a multi-point fixation. Compared to a single connecting bracket, this multi-point fixation provides a more stable connection between the extension plate structure and the trolley, reducing sway caused by uneven force. When the plate is carrying heavy objects, the multiple connecting brackets can share the pressure, preventing damage to a single connecting bracket due to excessive load, enhancing the overall structure's resistance to deformation, and ensuring the stability of the goods during transportation.

[0012] In one embodiment, the extension assembly includes an extension bracket and an extension connector. There are multiple extension connectors, and multiple extension connectors are arranged on the extension bracket. There are multiple connecting brackets, and multiple extension connectors are placed one-to-one in the connecting spaces of the multiple connecting brackets. The installation assembly is arranged on the extension bracket and is located at the end of the extension bracket away from the multiple extension connectors. By matching multiple extension connectors with the connecting spaces of multiple connecting brackets in a one-to-one correspondence, a stable structure with multi-point synchronous connection is formed. This distributed connection method greatly improves the connection strength and torsional resistance between the extension assembly and the connecting bracket, avoids the problem of force concentration that is prone to occur in single-point connection, and even when the plate carries heavier objects, the load can be evenly distributed to each connecting bracket, effectively reducing the pressure at a single connection point, and significantly enhancing the load-bearing stability and service life of the entire extension plate. As a core load-bearing component, the extension bracket not only provides a stable mounting base for multiple extension connectors and mounting components, but also further strengthens its structural rigidity by incorporating an intermediate bracket within the extension bracket. The intermediate bracket effectively resists bending deformation caused by the extension bracket under load, ensuring that the extension bracket maintains structural strength under all circumstances, providing a flat load-bearing surface for the panel and improving its adaptability to objects of different shapes. The mounting assembly is positioned at the end of the extension bracket away from the extension connector, creating a reasonable force arm distribution between the panel's load points and the support points of the connecting bracket. Combined with the stability of the multi-point connection, this further optimizes the overall structural force balance and reduces shaking or deformation during use.

[0013] In one embodiment, the extension bracket includes an extension body and a matching bracket, a plurality of the extension connectors are provided on the extension body, the number of the matching brackets is multiple, and the matching brackets are provided on the extension body and are located at one end of the extension bracket away from the plurality of extension connectors. The installation assembly is provided on the plurality of matching brackets, and the matching bracket is provided with the third connection notch. A stable connection is formed between the plurality of extension connectors and the connection body, ensuring that the entire extension assembly can stably withstand the pressure from the plate. The distribution design of the plurality of extension connectors can evenly distribute the force to the extension body, avoiding structural deformation caused by excessive force at a single point. Compared with the design of a single connection point, the load-bearing stability of the extension assembly is greatly improved, making the trolley more reliable when transporting heavier items. A plurality of matching brackets are provided at one end of the extension body away from the extension connector, providing multi-point support for the installation assembly. This multi-point distributed support method can make the connection between the installation assembly and the matching bracket more secure, and reduce the shaking of the installation assembly caused by uneven force. When the cart travels over bumpy roads, the impact force generated by the cargo on the panel is transmitted through the mounting assembly to the multiple mating brackets, where it is then dispersed and absorbed by the extended main body, reducing the risk of localized component damage and extending the service life of the structure. The third connecting notch on the mating bracket mates with the mounting assembly, precisely securing it in place. This retaining design ensures that the relative position of the mounting assembly and mating bracket is fixed, ensuring that the panel's bearing surface remains flat.

[0014] In one embodiment, the extended connector includes a second connecting shaft and a connecting hook, the second connecting shaft is arranged on the extended bracket, the connecting hook is arranged on the second connecting shaft, the connecting hook is arranged on the connecting bracket and is located at the connecting space, the connecting hook is against the connecting bracket, and the connecting hook is adapted to the first connecting notch. By arranging the second connecting shaft on the extended bracket, a stable installation foundation is provided for the connecting hook, ensuring that the connecting hook can stably play a connecting and limiting role. The connecting hook is arranged at the connecting space and is against the connecting bracket, which can limit the extended connector and avoid loose gaps. The adaptation design of the connecting hook and the first connecting notch is the key to achieving precise limitation. This adaptation can firmly lock the extension component in a preset position to prevent it from shifting in the horizontal direction. Compared with a trolley that lacks this structure, this design can significantly improve the impact resistance of the extension plate. When traditional trolleys are equipped with simple extension components, the extension parts often shake or even fall off due to loose connections. However, the tight fit between the connecting hook and the first connecting notch, combined with the mutual resistance between the connecting hook and the connecting bracket, forms multiple insurances, allowing the extension component to remain stable under various complex road conditions.

[0015] In one embodiment, the mounting assembly includes a mounting plate and a limiting pipe fitting, and the number of the mounting plates is multiple, and the multiple mounting plates are arranged on the extension assembly, the limiting pipe fitting is arranged between the multiple mounting plates, and the plate is arranged on the multiple mounting plates and the limiting pipe fitting. By arranging multiple mounting plates on the extension assembly, a multi-point support foundation is provided for the plate, and the weight of the plate can be evenly distributed to the extension assembly, avoiding local deformation caused by single-point force, and enhancing the load-bearing stability of the overall structure. The limiting pipe fitting is arranged between multiple mounting plates, which not only forms a lateral connection and support for the mounting plates, and improves the structural rigidity between the mounting plates, but also plays a lateral limiting role for the plates placed on the mounting plates, effectively preventing the plates from being displaced or slipping due to vibration or external force during use, and solving the problem of traditional plate installation being easy to loosen. The panels are simultaneously arranged on multiple mounting plates and limiting pipes. Through the dual cooperation of surface contact and lateral limitation, a stable installation structure is formed, ensuring that the panels remain stable during the expansion or storage of the extended components, thereby improving the adaptability to panels of different specifications and shapes.

[0016] In one embodiment, the mounting plate includes a mounting plate body and a bent plate. There are two bent plates, and the two bent plates are arranged on the mounting plate body and located on both sides of the mounting plate body. The mounting plate body is arranged on the extension assembly and located at the third connection notch. The limiting pipe is arranged on the mounting plate body and passes through the bent plate. The side of the bent plate away from the mounting plate body abuts against the plate. By arranging the mounting plate body at the third connection notch of the extension assembly, a precise fitting connection with the extension assembly is achieved, providing a stable installation foundation for the entire mounting assembly. The two bent plates are located on both sides of the mounting plate body. When the plate is arranged on the mounting assembly, the side of the bent plate away from the mounting plate body abuts against the plate, providing support for the plate. Combined with the limiting pipe fittings arranged on the main body of the mounting plate and passing through the bending plate, not only can multiple mounting plates form an organic whole through the limiting pipe fittings, greatly improving the overall rigidity and deformation resistance of the mounting assembly, but also making the force transmission more uniform. The force exerted on the plate can be transmitted to the main body of the mounting plate through the bending plate, and then dispersed to other mounting plates through the limiting pipe fittings, and finally transmitted to the extension assembly, avoiding structural damage caused by excessive local force, and significantly improving the load-bearing stability and service life of the entire extension plate.

[0017] In one embodiment, the panel is provided with a panel mounting hole, and the number of the panel mounting holes is multiple, and the multiple panel mounting holes are located on both sides of the panel, and the panel is connected to the mounting assembly through the multiple panel mounting holes. By providing multiple panel mounting holes located on both sides of the panel and connecting it to the mounting assembly, the force can be evenly dispersed from both sides of the panel, avoiding the problem of force concentration caused by a single point or single-sided connection, and greatly enhancing the stability of the connection between the panel and the mounting assembly. Even when carrying heavy objects or being subjected to lateral forces, it can effectively prevent the panel from tilting, loosening or even falling off, solving the pain point of insufficient stability of the traditional connection method. This multi-point double-sided layout design allows the panel to select different mounting hole positions according to actual needs during installation, flexibly adapting to the size and spacing of the mounting assembly, and is not only compatible with mounting assemblies of different specifications.

[0018] In one embodiment, the trolley further includes wheels, wherein the number of wheels is multiple and the wheels are mounted on the mounting assembly. With multiple wheels mounted on the mounting assembly, when the panel on the mounting assembly is used to carry heavy or bulky cargo, the wheels alone cannot balance the weight of the extension, which can easily cause the mounting assembly and extension assembly to be subjected to excessive stress and deform. The multiple wheels provide additional support for the mounting assembly, distributing some of the weight of the cargo on the panel to the ground, reducing the load-bearing pressure at the connection between the extension assembly and the connecting bracket, preventing structural damage caused by long-term loads, and extending the service life of the entire extension panel structure. Furthermore, an extension panel structure without wheels can cause friction between the extension and the ground during transport, increasing pushing resistance, especially on uneven surfaces. Multiple wheels, however, convert sliding friction into rolling friction, significantly reducing pushing resistance and making the trolley easier to control. Even when the panel is carrying heavy cargo, the rolling wheels ensure smooth movement, reducing labor and improving transportation efficiency.

[0019] A second aspect of the present application discloses a trolley, comprising: the above-mentioned extension plate structure; and a trolley body, wherein the extension plate structure is detachably mounted on the trolley body.

[0020] The above-mentioned second aspect discloses a trolley, in which the extension plate structure can be detachably mounted on the trolley body. When it is necessary to transport items of larger volume or a large number, the extension plate can be mounted on the trolley body, and the load-bearing area can be expanded by unfolding the extension component to meet diverse load-bearing requirements. When transporting small items or when no additional load-bearing space is required, the extension plate can be conveniently removed from the trolley body to avoid increasing the overall volume and weight of the trolley when the extension plate is idle, thereby improving the mobility of the trolley in narrow spaces and solving the problem that traditional trolleys have a fixed load-bearing area and are difficult to adapt to different loading scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a first perspective view of the trolley;

[0022] Figure 2 is a second perspective view of the trolley;

[0023] Figure 3 is a first perspective view of the extended plate structure;

[0024] Figure 4 is a second perspective view of the extended plate structure;

[0025] Figure 5 is a first stereoscopic view of the connecting bracket;

[0026] Figure 6 is a second stereoscopic view of the connecting bracket;

[0027] Figure 7 is a third perspective view of the connecting bracket;

[0028] Figure 8 is a third perspective view of the extended plate structure;

[0029] Figure 9 is a perspective view of the extended assembly;

[0030] Figure 10 is a fourth perspective view of the extended plate structure;

[0031] Figure 11 is a fifth perspective view of the extended plate structure;

[0032] Figure 12 A perspective view of the installed components;

[0033] Figure 13 A three-dimensional diagram of the panel.

[0034] The corresponding relationship between the reference numerals and component names is as follows:

[0035] 1 connecting bracket, 11 bracket body, 111 bracket main board, 112 bracket side plate, 12 connecting body, 121 connecting main shell, 122 connecting bottom plate, 123 first connecting axis, 13 reinforcing ribs, 101 connecting space, 102 first connecting notch, 103 second connecting notch, 104 mounting hole;

[0036] 2 extension assembly, 21 extension bracket, 211 extension body, 212 matching bracket, 22 extension connector, 221 second connecting shaft, 222 connecting hook, 201 third connecting notch;

[0037] 3 mounting assembly, 31 mounting plate, 311 mounting plate body, 312 bending plate, 32 limiting pipe fitting;

[0038] 4 plates, 401 plate mounting holes;

[0039] 5 wheels. DETAILED DESCRIPTION

[0040] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0041] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0042] The following describes the extension plate structure and the trolley according to some embodiments of the present invention with reference to the accompanying drawings.

[0043] Example 1

[0044] like Figures 1 to 13 As shown, this embodiment discloses an extension plate structure, including: a connecting bracket 1, the connecting bracket 1 is used to be connected to the trolley body, and the connecting bracket 1 is provided with a connecting space 101; an extension component 2, the extension component 2 is movably arranged on the connecting bracket 1 and the extension component 2 extends toward a side away from the connecting bracket 1, and the movable connection between the extension component 2 and the connecting bracket 1 is located in the connecting space 101, and the extension component 2 is provided with a third connecting notch 201; an installation component 3, the installation component 3 is arranged on the extension component 2 and is adapted to be installed in the third connecting notch 201, and the installation component 3 is located at an end of the extension component 2 away from the connecting bracket 1; a plate 4, the plate 4 is arranged on the installation component 3 and / or the extension component 2.

[0045] This application discloses an extension plate structure that can be applied to structures such as trolleys. Trolleys without extension plates are limited by fixed dimensions and have difficulty carrying overlong or overwide items. This can easily lead to items extending beyond the vehicle body, causing unstable transportation. This structure, however, expands the loading space by extending the assembly 2. The plate 4 can accommodate cargo that exceeds the original vehicle body as needed, significantly improving the trolley's adaptability to odd-shaped and large items, avoiding an increase in the number of transports due to loading restrictions, and improving transportation efficiency. The mounting assembly 3 securely fixes the plate 4, and the connecting bracket 1 is tightly connected to the trolley through the mounting hole 104. The adaptable notches of each component enhance overall stability, ensuring that cargo is not easily displaced during transportation, reducing the risk of items falling, and reducing manual intervention costs. The connecting space 101 and the first connecting notch 102 provide precise positioning for the extension assembly 2, preventing it from shifting left or right during transportation. The mounting assembly 3, in conjunction with the fixing of the plate 4, forms a stable load-bearing surface. Even during bumpy transportation, the cargo is not easily shaken, solving the instability problem of traditional trolleys when loading large items. Moreover, the connection space 101 limits the range of motion of the extension component 2, making the force more uniform, reducing component wear, extending the overall service life of the trolley, and reducing maintenance costs, while maintaining the adaptability to goods of different specifications, allowing the trolley to continue to function stably during long-term use.

[0046] like Figure 3 、 Figure 4 and Figure 5 As shown, in addition to the features of the above-mentioned embodiment, this embodiment further defines that: the connecting bracket 1 includes a bracket body 11 and a connecting body 12. The bracket body 11 is used to connect to the trolley body. The connecting body 12 is arranged on the bracket body 11, and the extension assembly 2 is arranged on the connecting body 12. By arranging the connecting body 12 on the bracket body 11, the bracket body 11 is focused on connecting to the trolley body, etc., and the overall stability can be enhanced through a more suitable connection method. Compared with trolleys without an extension plate structure, it avoids the problem of loose connections when temporarily adding components. The force applied to the extension assembly 2 when carrying goods can be evenly transmitted to the trolley body through the bracket body 11, reducing the risk of local structural damage due to excessive force and extending the service life of the trolley. The connecting body 12 serves as the mounting carrier for the extension assembly 2, providing it with more precise installation positioning. In conjunction with the limiting function of the connection space 101, the extension assembly 2 further reduces the shaking amplitude during transportation. Compared to trolleys without this design, this design more reliably ensures the safe transportation of overlong cargo, while also making the operation of the extension assembly 2 smoother, reducing jamming caused by component misalignment, and improving ease of use. The bracket body 11 can be specifically adapted to the structural characteristics of the trolley, while the connecting body 12 ensures the installation accuracy of the extension assembly 2. This allows the same extension plate structure to be applied to a wider range of trolley types. Compared to trolleys without an extension plate structure that rely solely on fixed dimensions, this significantly expands the scope of use and practicality.

[0047] like Figure 5 and Figure 6 As shown, in addition to the features of the above embodiment, this embodiment further defines that: the bracket body 11 includes a bracket main plate 111 and bracket side plates 112. There are two bracket side plates 112, which are arranged on the bracket main plate 111 and located on both sides of the bracket main plate 111. The connecting body 12 is arranged on the bracket main plate 111. The bracket main plate 111 is provided with a second connecting notch 103 and mounting holes 104. There are multiple mounting holes 104, which are distributed around the second connecting notch 103. By arranging the two bracket side plates 112 on both sides of the bracket main plate 111, the bracket side plates 112 on both sides can provide stable support for the bracket main plate 111 from the lateral direction, significantly enhancing the overall rigidity and torsional resistance of the bracket body 11, effectively preventing deformation when carrying heavy objects or being subjected to external impact, and providing a solid foundation for the stable installation of the connecting body 12 and the subsequent extension assembly 2 and plate 4. The second connection notch 103 provided on the bracket main board 111 can form a precise interlocking connection with the trolley body. In conjunction with the multiple mounting holes 104 distributed around it, the firmness of the connection with the trolley body can be further improved through multi-point fixation, solving the problem of easy loosening and poor adaptability of the traditional single connection method. The design of multiple mounting holes 104 distributed around the second connection notch 103 allows the extension plate to flexibly adapt to trolley bodies such as trolleys of different specifications. Users can choose the appropriate installation point according to actual needs, which significantly broadens the scope of application of the product. At the same time, the bracket main board 111 and the bracket side panels 112 on both sides adopt an integrated molding design, eliminating the gaps and stress concentration points in the connection of components in the traditional split structure, greatly enhancing the overall structural strength and deformation resistance of the bracket main body 11, and can more stably bear the weight of the extension component 2 and the plate 4. At the same time, it effectively disperses the impact force generated by the trolley during movement, extending the service life of the device.

[0048] like Figure 5 、 Figure 6 and Figure 7As shown, in addition to the features of the above-mentioned embodiment, this embodiment further defines: the connecting body 12 includes a connecting main shell 121, a connecting base 122, and a first connecting shaft 123. The connecting main shell 121 is disposed on the bracket body 11, and the connecting base 122 is disposed on the connecting main shell 121 and is located on the side of the connecting base 122 away from the bracket body 11. The bracket body 11, the connecting main shell 121, and the connecting base 122 cooperate to form a connecting space 101. The first connecting shaft 123 is disposed on the connecting main shell 121 and passes through the connecting space 101. The extension assembly 2 abuts against the connecting main shell 121 and the connecting base 122, and the connecting base 122 is provided with a first connecting notch 102. By utilizing the connecting main shell 121, the connecting base 122, and the bracket body 11 to form the connecting space 101, a stable installation environment is provided for the extension assembly 2. This fixed space ensures its stable position and will not be arbitrarily changed by external forces during use, laying a solid foundation for subsequent load-bearing work. The main connecting shell 121 and the connecting base 122 counteract the extension assembly 2, providing support and restraint from different directions. The main connecting shell 121 provides lateral support to prevent the extension assembly 2 from drifting sideways, while the connecting base 122 provides support from the bottom to prevent it from falling downward. This dual function secures the extension assembly 2 within the connecting space 101, ensuring stability and load safety even when the trolley encounters bumps during travel. A first connecting shaft 123, located on the main connecting shell 121 and extending through the connecting space 101, further secures the extension assembly 2. It cooperates with the main connecting shell 121 and the connecting base 122 to form a three-dimensional fixed frame that fully encloses and restrains the extension assembly 2, significantly enhancing the stability and robustness of the overall structure. The first connecting notch 101 on the connecting base 122 is particularly crucial for restraining the extension assembly 2. The precise fit of the first connecting notch 102 securely locks the extension assembly 2 in place, preventing it from shifting horizontally. This ensures that the relative position of the extension component 2 and the connecting body 12 remains constant, thereby ensuring that the extended bearing surface formed by the plate 4 is flat and stable.

[0049] like Figure 2 and Figure 5As shown, in addition to the features of the above embodiments, this embodiment further defines: the connecting bracket 1 is provided with a first connecting notch 102, a second connecting notch 103 and a mounting hole 104, the second connecting notch 103 is used to adapt to the trolley body, the mounting hole 104 is used to cooperate with the trolley body, and the extension component 2 is adapted to the first connecting notch 102. The first connecting notch 102, the second connecting notch 103 and the mounting hole 104 on the connecting bracket 1 have clear division of labor and synergistic effect, providing key support for the adaptation and stable operation of the extension plate structure and the trolley: the second connecting notch 103 achieves the initial positioning of the extension plate structure and the trolley through precise adaptation to the trolley body, ensuring the accuracy of the connection direction and position between the two, laying the foundation for subsequent fixation; the mounting hole 104 closely cooperates with the trolley body through fasteners, converting the initial positioning into a rigid connection, avoiding loosening due to vibration during transportation, and enhancing the stability of the overall structure; and the adaptation of the first connecting notch 102 to the extension component 2 forms a precise limit for the extension component 2 to prevent it from moving in the horizontal or vertical direction.

[0050] like Figure 5 and Figure 6As shown, in addition to the features of the above-mentioned embodiment, this embodiment further comprises a reinforcing rib 13, the first end face of which is disposed on the bracket body 11, and the second end face of which is disposed on the connecting body 12. By connecting the first end face of the reinforcing rib 13 to the bracket body 11 and the second end face to the connecting body 12, a stable triangular support structure is formed. This structure effectively distributes stress at the connection between the bracket body 11 and the connecting body 12, preventing deformation and loosening of the connection caused by long-term heavy loads or frequent use. Compared to a structure without reinforcing ribs 13, the connection between the bracket body 11 and the connecting body 12 is more secure when transporting heavy cargo, reducing the risk of displacement of the extension assembly 2 and tilting of the panel 4 due to structural deformation, thereby ensuring the stability of cargo transportation. After adding the extension plate structure, the extension portion increases the overall load bearing capacity. The presence of reinforcing ribs 13 strengthens the connection strength between the connecting body 12 and the bracket body 11, enabling the connecting body 12 to more stably support the extension assembly 2 and the cargo on the panel 4, thereby increasing the load-bearing capacity of the entire extension plate structure. This not only expands the cart's loading space but also allows it to safely carry heavier items. Compared to a structure lacking the reinforcing ribs 13, this reduces the probability of component damage due to insufficient load-bearing capacity, thereby extending the cart's service life. Furthermore, the reinforcing ribs 13 enhance the structure's impact resistance. When the cart encounters a bumpy road or makes an emergency stop while driving, the extension plate structure is subject to significant impact. The reinforcing ribs 13, through their inherent rigidity, can partially cushion this impact, reducing the relative displacement between the bracket body 11 and the connecting body 12 caused by the impact. This, in turn, ensures that the first connecting notch 102 retains its positional restraint on the extension assembly 2, ensuring that the cargo on the plate 4 remains stable.

[0051] like Figures 1 to 4 As shown, in addition to the features of the above-mentioned embodiment, this embodiment further provides for the provision of multiple connecting brackets 1. Multiple connecting brackets 1 can be connected to the trolley from different positions, forming a multi-point fixation. Compared to a single connecting bracket, this multi-point fixation provides a more stable connection between the extension plate structure and the trolley, reducing swaying caused by uneven force. When the plate 4 carries a heavy load, the multiple connecting brackets 1 can share the pressure, preventing damage to a single connecting bracket due to excessive load, enhancing the overall structure's resistance to deformation, and ensuring the stability of the goods during transportation.

[0052] like Figure 4 、 Figure 5 and Figure 8As shown, in addition to the features of the above-mentioned embodiment, this embodiment further defines that: the extension assembly 2 includes an extension bracket 21 and an extension connector 22, the number of the extension connectors 22 is multiple, and the multiple extension connectors 22 are arranged on the extension bracket 21, the number of the connecting bracket 1 is multiple, and the multiple extension connectors 22 are placed in a one-to-one correspondence at the connection spaces 101 of the multiple connecting brackets 1, and the installation assembly 3 is arranged on the extension bracket 21 and is located at the end of the extension bracket 21 away from the multiple extension connectors 22. By matching the multiple extension connectors 22 with the connection spaces 101 of the multiple connecting brackets 1 in a one-to-one correspondence, a stable structure with multi-point synchronous connection is formed. This distributed connection method greatly improves the connection strength and torsional resistance between the extension assembly 2 and the connecting bracket 1, avoids the problem of force concentration that is prone to single-point connection, and even when the plate 4 carries heavy objects, the load can be evenly distributed to each connecting bracket 1, effectively reducing the pressure at a single connection point and significantly enhancing the load-bearing stability and service life of the entire extension plate. As the core load-bearing component, the extension bracket 21 not only provides a stable installation foundation for multiple extension connectors 22 and the installation assembly 3, but also further strengthens its own structural rigidity by providing an intermediate bracket on the extension bracket 21. The intermediate bracket can effectively resist the bending deformation caused by the extension bracket 21 when it is stressed, ensuring that the extension bracket 21 always maintains its structural strength under all circumstances, providing a flat load-bearing surface for the plate 4, and improving its adaptability to objects of different shapes. The installation assembly 3 is set at the end of the extension bracket 21 away from the extension connector 22, so that the force point of the plate 4 and the support point of the connecting bracket 1 form a reasonable force arm distribution. Combined with the stability of the multi-point connection, it further optimizes the force balance of the overall structure and reduces shaking or deformation during use.

[0053] like Figure 8 and Figure 9As shown, in addition to the features of the above-mentioned embodiment, this embodiment further defines: the extension bracket 21 includes an extension body 211 and a mating bracket 212. Multiple extension connectors 22 are disposed on the extension body 211. There are multiple mating brackets 212, each located on the extension body 211 at an end of the extension bracket 21 remote from the multiple extension connectors 22. The mounting assembly 3 is disposed on the multiple mating brackets 212, each having a third connection notch 201. The multiple extension connectors 22 form a secure connection with the connecting body 12, ensuring that the entire extension assembly can stably withstand pressure from the plate 4. The distributed design of the multiple extension connectors 22 evenly distributes force across the extension body, preventing structural deformation caused by excessive force at a single point. Compared to a single connection point design, this significantly improves the load-bearing stability of the extension assembly, making the cart more reliable when transporting heavy items. The multiple mating brackets 212 are disposed at the end of the extension body 211 remote from the extension connectors 22, providing multi-point support for the mounting assembly 3. This multi-point distributed support method can make the connection between the installation component 3 and the matching bracket 212 more secure, and reduce the shaking of the installation component 3 due to uneven force. When the cart is traveling on a bumpy road, the impact force generated by the goods on the plate 4 will be transmitted to the multiple matching brackets 212 through the installation component 3, and then dispersed and resolved by the extended main body 211, reducing the risk of damage to local components and extending the service life of the structure. The third connection notch 201 on the matching bracket 212 is adapted to the installation component 3 and can form a precise limit for the installation component 3. This limit design can ensure that the relative position of the installation component 3 and the matching bracket 212 is fixed, thereby ensuring that the bearing surface of the plate 4 always remains flat.

[0054] like Figure 5 、 Figure 8 and Figure 10As shown, in addition to the features of the above-described embodiment, this embodiment further defines that the extended connector 22 includes a second connecting shaft 221 and a connecting hook 222. The second connecting shaft 221 is disposed on the extended bracket 21, and the connecting hook 222 is disposed on the second connecting shaft 221. The connecting hook 222 is disposed on the connecting bracket 1 and located in the connecting space 101. The connecting hook 222 abuts against the connecting bracket 1 and fits into the first connecting notch 102. The placement of the second connecting shaft 221 on the extended bracket 21 provides a stable mounting base for the connecting hook 222, ensuring that the connecting hook 222 can stably perform its connecting and retaining functions. The connecting hook 222 is disposed in the connecting space 101 and abuts against the connecting bracket 1, thereby limiting the position of the extended connector 22 and preventing any loose gaps. The adaptable design of the connecting hook 222 and the first connecting notch 102 is key to achieving precise positioning. This fit securely locks the extended assembly 2 in its preset position, preventing horizontal displacement. Compared to trolleys without this structure, this design significantly improves the impact resistance of the extension plate. When adding simple extension components to conventional trolleys, the extension often wobble or even fall off due to loose connections. However, the tight fit between the connecting hook 222 and the first connecting notch 102, combined with the contact between the connecting hook 222 and the connecting bracket 1, provides multiple safeguards, ensuring that the extension assembly 2 remains stable even in complex road conditions.

[0055] like Figure 3 and Figure 11 As shown, in addition to the features of the above-mentioned embodiment, this embodiment further defines that: the mounting assembly 3 includes a mounting plate 31 and a position-limiting pipe 32. The number of mounting plates 31 is multiple, and the multiple mounting plates 31 are arranged on the extension assembly 2. The position-limiting pipe 32 is arranged between the multiple mounting plates 31. The panel 4 is arranged on the multiple mounting plates 31 and the position-limiting pipe 32. By arranging multiple mounting plates 31 on the extension assembly 2, a multi-point support foundation is provided for the panel 4, which can evenly distribute the weight of the panel 4 to the extension assembly 2, avoid local deformation caused by single-point force, and enhance the load-bearing stability of the overall structure. The position-limiting pipe 32 is arranged between the multiple mounting plates 31, not only forming a lateral connection and support for the mounting plates 31, improving the structural rigidity between the mounting plates 31, but also acting as a lateral limiter for the panel 4 placed on the mounting plates 31, effectively preventing the panel 4 from shifting or sliding due to vibration or external impact during use, and solving the problem of the traditional panel 4 being easily loosened during installation. The panel 4 is simultaneously arranged on multiple mounting plates 31 and limiting pipes 32. Through the dual cooperation of surface contact and lateral limitation, a stable mounting structure is formed, ensuring that the panel 4 always remains stable during the expansion or storage of the extension component 2, thereby improving the adaptability to panels of different specifications and shapes.

[0056] like Figure 11 and Figure 12As shown, in addition to the features of the above-mentioned embodiment, this embodiment further defines that: the mounting plate 31 includes a mounting plate body 311 and a bent plate 312. There are two bent plates 312, which are disposed on the mounting plate body 311 and located on either side of the mounting plate body 311. The mounting plate body 311 is disposed on the extension assembly 2 and located at the third connection notch 201. The limiting pipe 32 is disposed on the mounting plate body 311 and passes through the bent plate 312. The side of the bent plate 312 facing away from the mounting plate body 311 abuts against the panel 4. By positioning the mounting plate body 311 at the third connection notch 201 of the extension assembly 2, a precise fit and connection with the extension assembly 2 is achieved, providing a stable installation foundation for the entire mounting assembly 3. The two bent plates 312 are located on either side of the mounting plate body 311. When the panel 4 is mounted on the mounting assembly 3, the side of the bent plate 312 facing away from the mounting plate body 311 abuts against the panel 4, providing support for the panel 4. In addition, the limiting pipe 32 is set on the mounting plate body 311 and passes through the bending plate 312, which not only allows multiple mounting plates 31 to form an organic whole through the limiting pipe 32, greatly improving the overall rigidity and deformation resistance of the mounting assembly 3, but also makes the force transmission more uniform. The force exerted on the plate 4 can be transmitted to the mounting plate body 311 through the bending plate 312, and then dispersed to other mounting plates through the limiting pipe 32, and finally transmitted to the extension assembly 2, avoiding structural damage caused by excessive local force, and significantly improving the load-bearing stability and service life of the entire extension plate.

[0057] like Figure 3 and Figure 13 As shown, in addition to the features of the above-mentioned embodiment, this embodiment further defines that: the plate 4 is provided with a plurality of plate mounting holes 401, the plurality of plate mounting holes 401 being located on both sides of the plate 4, and the plate 4 is connected to the mounting assembly 3 via the plurality of plate mounting holes 401. By providing the plate 4 with a plurality of plate mounting holes 401 located on both sides and connecting the plate 4 to the mounting assembly 3 through the plurality of plate mounting holes 401, the force can be evenly distributed from both sides of the plate 4, avoiding the force concentration problem caused by a single-point or single-sided connection, and significantly enhancing the stability of the connection between the plate 4 and the mounting assembly 3. Even when carrying heavy objects or subjected to lateral forces, the plate 4 can be effectively prevented from tilting, loosening, or even falling off, thus resolving the pain point of insufficient stability of traditional connection methods. This multi-point, double-sided layout design allows the plate 4 to select different mounting hole positions according to actual needs during installation, flexibly adapting to the size and spacing of the mounting assembly 3, and not only being compatible with mounting assemblies 3 of different specifications.

[0058] like Figure 3 and Figure 4As shown, in addition to the features of the above-mentioned embodiment, this embodiment further provides the following features: It also includes wheels 5, with multiple wheels 5 being provided on the mounting assembly 3. With multiple wheels 5 provided on the mounting assembly 3, when the panel 4 on the mounting assembly 3 is used to carry heavy or bulky cargo, the wheels alone cannot balance the weight of the extension, which can easily cause the mounting assembly 3 and the extension assembly 2 to be subjected to excessive force and deform. The multiple wheels 5 provide additional support for the mounting assembly 3, distributing some of the weight of the cargo on the panel 4 to the ground, reducing the load-bearing pressure at the connection between the extension assembly 2 and the connecting bracket 3, preventing structural damage caused by long-term loads, and extending the service life of the entire extension panel structure. Furthermore, an extension panel structure without wheels 5 would cause friction between the extension and the ground during transport, increasing pushing resistance, especially on uneven surfaces. However, multiple wheels 5 convert sliding friction into rolling friction, significantly reducing pushing resistance and making it easier for users to control the cart. Even if the plate 4 carries heavy goods, it can still move smoothly through the rolling of the wheels 5, reducing manpower consumption and improving transportation efficiency.

[0059] Example 2

[0060] like Figures 1 to 13 As shown, this embodiment discloses a trolley, comprising: the above-mentioned extension plate; a trolley body, and the extension plate structure can be detachably mounted on the trolley body.

[0061] The second aspect of the present application discloses a trolley, in which an extension plate structure can be detachably mounted on the trolley body. When it is necessary to transport large items or a large number of items, the extension plate can be mounted on the trolley body, and the load-bearing area can be expanded by unfolding the extension component 2 to meet diverse load-bearing requirements. When transporting small items or when no additional load-bearing space is required, the extension plate can be conveniently removed from the trolley body to avoid increasing the overall volume and weight of the trolley when the extension plate is idle, thereby improving the mobility of the trolley in narrow spaces and solving the problem that traditional trolleys have a fixed load-bearing area and are difficult to adapt to different loading scenarios.

[0062] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. An extension plate structure, characterized in that: The extension plate structure includes: A connecting bracket (1), the connecting bracket (1) being used to connect to the trolley body, the connecting bracket (1) being provided with a connecting space (101); An extension component (2), the extension component (2) being movably arranged on the connecting bracket (1) and extending toward a side away from the connecting bracket (1), the movable connection between the extension component (2) and the connecting bracket (1) being located in the connecting space (101), and the extension component (2) being provided with a third connecting notch (201); a mounting assembly (3), the mounting assembly (3) being arranged on the extension assembly (2) and being adapted to be mounted in the third connection notch (201), the mounting assembly (3) being located at an end of the extension assembly (2) away from the connection bracket (1); A plate (4), wherein the plate (4) is arranged on the mounting component (3) and / or the extension component (2).

2. The extension plate structure according to claim 1, characterized in that: The connecting bracket (1) comprises a bracket body (11) and a connecting body (12); the bracket body (11) is used to be connected to the trolley body; the connecting body (12) is arranged on the bracket body (11); and the extension component (2) is movably arranged on the connecting body (12).

3. The extension plate structure according to claim 2, characterized in that: The bracket body (11) comprises a bracket main board (111) and a bracket side board (112), the number of the bracket side boards (112) is two, the two bracket side boards (112) are arranged on the bracket main board (111) and are located on both sides of the bracket main board (111), the connecting body (12) is arranged on the bracket main board (111), the bracket main board (111) is provided with a second connecting notch (103) and a mounting hole (104), the number of the mounting holes (104) is multiple, and the multiple mounting holes (104) are distributed around the second connecting notch (103); and / or the connecting body (12) comprises a connecting main shell (121), a connecting bottom plate (122) and a first connecting shaft (123); the connecting main shell (121) is arranged on the bracket body (11); the connecting bottom plate (122) is arranged on the connecting main shell (121) and is located on a side of the connecting bottom plate (122) away from the bracket body (11); the bracket body (11), the connecting main shell (121) and the connecting bottom plate (122) cooperate to form the connecting space (101); the first connecting shaft (123) is arranged on the connecting main shell (121) and passes through the connecting space (101); the extension component (2) abuts against the connecting main shell (121) and the connecting bottom plate (122); and the connecting bottom plate (122) is provided with a first connecting notch (102); And / or the connecting bracket (1) is provided with a first connecting notch (102), a second connecting notch (103) and a mounting hole (104), the second connecting notch (103) is used to match the trolley body, the mounting hole (104) is used to cooperate with the trolley body, and the extension component (2) is adapted to the first connecting notch (102).

4. The extension plate structure according to claim 2, characterized in that: It also includes a reinforcing rib (13), wherein a first end surface of the reinforcing rib (13) is arranged on the bracket body (11), and a second end surface of the reinforcing rib (13) is arranged on the connecting body (12); And / or the number of the connecting brackets (1) is multiple.

5. The extension plate structure according to claim 1, characterized in that: The extension assembly (2) comprises an extension bracket (21) and an extension connecting piece (22), the number of the extension connecting pieces (22) is plural, and the plural extension connecting pieces (22) are arranged on the extension bracket (21), the number of the connection bracket (1) is plural, and the plural extension connecting pieces (22) are placed one-to-one in the connection spaces (101) of the plural connection brackets (1), and the mounting assembly (3) is arranged on the extension bracket (21) and is located at an end of the extension bracket (21) away from the plural extension connecting pieces (22).

6. The extension plate structure according to claim 5, characterized in that: The extension bracket (21) comprises an extension body (211) and a matching bracket (212), a plurality of the extension connecting members (22) are arranged on the extension body (211), the number of the matching brackets (212) is multiple, the plurality of matching brackets (212) are arranged on the extension body (211) and are located at one end of the extension body (211) away from the plurality of the extension connecting members (22), the mounting assembly (3) is arranged on the plurality of matching brackets (212), and the matching brackets (212) are provided with the third connection notch (201); And / or the extended connecting member (22) includes a second connecting shaft (221) and a connecting hook (222), the second connecting shaft (221) is arranged on the extended bracket (21), the connecting hook (222) is arranged on the second connecting shaft (221), the connecting hook (222) is arranged on the connecting bracket (1) and is located at the connecting space (101), the connecting hook (222) is against the connecting bracket (1), the connecting bracket (1) is provided with a first connecting notch (102), and the connecting hook (222) is adapted to the first connecting notch (102).

7. The extension plate structure according to claim 1, characterized in that: The mounting assembly (3) comprises a mounting plate (31) and a position-limiting pipe member (32). The number of the mounting plates (31) is multiple, and the multiple mounting plates (31) are arranged on the extension assembly (2). The position-limiting pipe member (32) is arranged between the multiple mounting plates (31), and the plate member (4) is arranged on the multiple mounting plates (31) and the position-limiting pipe member (32).

8. The extension plate structure according to claim 7, characterized in that: The mounting plate (31) comprises a mounting plate body (311) and a bending plate (312), wherein the number of the bending plates (312) is two, and the two bending plates (312) are arranged on the mounting plate body (311) and located on both sides of the mounting plate body (311). The mounting plate body (311) is arranged on the extension component (2) and located at the third connection notch (201). The limiting pipe member (32) is arranged on the mounting plate body (311) and passes through the bending plate (312), and the side of the bending plate (312) away from the mounting plate body (311) abuts against the plate member (4).

9. The extension plate structure according to claim 1, characterized in that: The plate (4) is provided with a plate mounting hole (401), the number of the plate mounting holes (401) is multiple, and the multiple plate mounting holes (401) are respectively provided on both sides of the plate (4), and the plate (4) is connected to the mounting assembly (3) through the multiple plate mounting holes (401); And / or further comprises wheels (5), the number of the wheels (5) is plural, and the plural wheels (5) are arranged on the mounting assembly (3).

10. A trolley, characterized in that: The trolley comprises: The extension plate structure according to any one of claims 1 to 9; A trolley body, wherein the connecting bracket (1) is arranged on the trolley body.

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