Trundle assembly for square tube and movable square tube frame

Abstract

The utility model relates to the field of casters, in particular to a caster assembly for a square tube and a movable square tube frame. The trundle assembly for the square tube comprises an assembly body, the assembly body comprises a shell and a trundle connected with the shell, the shell is provided with a fixing part, and the shell extends into an inner cavity of the square tube and is fixed in the inner cavity of the square tube through the fixing part. The caster assembly extends into the inner cavity of the square tube through the shell and is fixed with the inner cavity of the square tube through the fixing part, so that the installation process between the caster assembly and the square tube is simplified, external fixing pieces such as bolts and nuts are not used, and the installation complexity and time are reduced; in addition, the stability of the trundle assembly is further improved, the risk that the trundle falls off due to the fact that an external fixing piece is loosened is reduced, and then the safety and reliability of the whole equipment are improved.

Description

Technical Field

[0001] The utility model relates to the field of casters, in particular to a caster assembly for square tubes and a movable square tube rack. Background Art

[0002] As a key mobile auxiliary device, caster assemblies are widely used at the bottom of various mobile devices, such as furniture, trolleys, medical equipment, etc. Their main function is to enable items to be moved easily. The design of casters takes into account different usage environments and load-bearing requirements to ensure their applicability and durability. However, when installing caster assemblies onto square tube structures, the prior art faces some problems. Traditional installation techniques require the use of external fixing parts such as bolts and nuts to complete the connection between the caster and the square tube. This not only makes the installation process complex and time-consuming but also poses certain safety hazards. Additionally, over time, these external fixing parts may become loose, resulting in the caster being unstable or even falling off during use. This not only affects the normal use of the equipment but may also cause safety accidents, reducing the overall safety and reliability of the equipment.

[0003] Therefore, it is necessary to develop a caster assembly for square tubes and a movable square tube rack to simplify the installation method between the caster assembly and the square tube while ensuring safety and reliability during long-term use. Summary of the Utility Model

[0004] In view of the problems in the prior art that the installation of caster assemblies onto square tube structures is complex, time-consuming, and poses safety hazards, the technical solution adopted by the utility model to solve its technical problems is as follows:

[0005] A caster assembly for square tubes includes a component main body, wherein the component main body includes a housing and a caster connected to the housing. The housing is provided with a fixing part, and the housing extends into the inner cavity of the square tube and is fixed in the inner cavity of the square tube through the fixing part.

[0006] Further, in the caster assembly for square tubes according to the solution, the housing is provided with an inner cavity. The component main body further includes a fastener. One side of the housing is further provided with a mounting hole penetrating the housing, and the caster is provided with a connection hole. The mounting hole and the connection hole are connected through the fastener so that the caster is fixed in the inner cavity of the housing.

[0007] Further, in the caster assembly for square tubes according to the solution, the fixing part is located on both sides of the housing and protrudes from the surface of the housing. One end of the housing is further provided with a second positioning end, which is used to limit the depth of the housing extending into the inner cavity of the square tube. A chamfer is provided on the side of the fixing part away from the second positioning end. The cross-section of the fixing part is triangular, with the inclined surface widening from top to bottom, and the fixing part has elasticity.

[0008] Further, in a caster assembly for a square pipe according to the solution, the fastener is a rivet, and the mounting hole and the connecting hole are connected by riveting so that the caster is fixed in the inner cavity of the housing.

[0009] Further, in a caster assembly for a square pipe according to the solution, the fastener is a pin, and the mounting hole and the connecting hole are respectively tightly fitted with the pin so that the caster is fixed in the inner cavity of the housing.

[0010] Further, in a caster assembly for a square pipe according to the solution, a limiting end is provided on one side of the mounting hole, a limiting groove is provided at one end of the fastener, a first positioning end is provided on one side of the limiting groove, the limiting end and the limiting groove cooperate to fix the direction of the fastener, and the first positioning end abuts against the housing to fix the position of the fastener.

[0011] Further, in a caster assembly for a square pipe according to the solution, a reinforcing plate is further provided at one end of the housing away from the second positioning end.

[0012] Further, in a caster assembly for a square pipe according to the solution, first grooves are provided on both sides of the housing, the mounting hole is located in the first groove, and a plurality of ribs extending along the mounting direction of the housing are provided in the inner cavity of the housing.

[0013] Further, in a movable square pipe rack according to the solution, a square pipe rack is further included.

[0014] Further, in a movable square pipe rack according to the solution, a plurality of snap grooves are provided on both sides of the square pipe rack near the caster, and the snap grooves cooperate with the fixing parts so that the square pipe rack and the housing are connected.

[0015] The beneficial effects of the present utility model are as follows:

[0016] In the present utility model, the housing extends into the inner cavity of the square pipe and is fixed to the inner cavity of the square pipe by the fixing part. This setting simplifies the installation process between the caster assembly and the square pipe, avoids the use of external fixing parts such as bolts and nuts, thereby reducing the installation complexity and required time; in addition, the present utility model also improves the stability of the caster assembly, reduces the risk of caster detachment caused by loosening of external fixing parts, and further improves the safety and reliability of the overall equipment.

[0017] The following will further illustrate the present utility model in conjunction with the drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic external view of a caster assembly for a square pipe according to the present utility model.

[0019] Figure 2An exploded view of the appearance of a caster assembly for a square pipe according to the present utility model.

[0020] Figure 3 An exploded view of the appearance of a caster assembly for a square pipe according to the present utility model.

[0021] Figure 4 An exploded view of the appearance of a caster assembly for a square pipe according to the present utility model.

[0022] Figure 5 An exploded view of the appearance of a caster assembly for a square pipe according to the present utility model.

[0023] Figure 6 An exploded view of the appearance of a caster assembly for a square pipe according to the present utility model.

[0024] Figure 7 A schematic diagram of a fastener for a caster assembly for a square pipe according to the present utility model.

[0025] Figure 8 An external view of a movable square pipe rack according to the present utility model.

[0026] Figure 9 An enlarged view of part I of a movable square pipe rack according to the present utility model. Detailed implementation manners

[0027] The following will make a detailed description of the implementation manners of the present utility model with reference to the accompanying drawings.

[0028] As Figures 1-7 shown, a caster assembly for a square pipe includes a component main body 1, wherein the component main body 1 includes a housing 2 and a caster 3 connected to the housing 2. The housing 2 is provided with a fixing portion 23, and the housing 2 extends into the inner cavity of the square pipe and is fixed in the inner cavity of the square pipe through the fixing portion 23.

[0029] In the present utility model, the housing 2 extends into the inner cavity of the square pipe and is fixed to the inner cavity of the square pipe by using the fixing portion 23. This setting simplifies the installation process between the caster assembly and the square pipe, avoids the use of external fixing parts such as bolts and nuts, thereby reducing the complexity and time required for installation; in addition, the present utility model also improves the stability of the caster assembly, reduces the risk of caster detachment caused by the loosening of external fixing parts, and thus enhances the safety and reliability of the overall equipment.

[0030] Specifically, the caster assembly realizes the direct fixation of the housing 2 to the square tube by providing a fixing portion 23 on the housing 2 and inserting the housing 2 into the inner cavity of the square tube. Through the cooperation between the inner cavity of the square tube and the fixing portion 23, no additional external fixing parts such as bolts or nuts are required. This setting not only simplifies the installation process, reduces the installation cost, but also improves the installation efficiency. Further, by not using external fixing parts, maintenance problems and potential safety hazards caused by the loosening or damage of external fixing parts are reduced. Further, this setting also enhances the stability and durability of the caster assembly during long-term use, ensuring the reliability of the equipment movement in various use environments.

[0031] Further, as Figures 1-7 shown, a caster assembly for a square tube, wherein the housing 2 is provided with a housing inner cavity 21, the assembly main body 1 further includes a fastener 4, one side of the housing 2 is further provided with a mounting hole 22 penetrating through the housing 2, the caster 3 is provided with a connection hole 31, and the mounting hole 22 and the connection hole 31 are connected by the fastener 4 so that the caster 3 is fixed in the housing inner cavity 21.

[0032] The utility model realizes the firm connection between the caster 3 and the housing 2 by fixing the caster 3 in the housing inner cavity 21. This setting not only improves the structural stability of the caster assembly, reduces the relative movement of the caster 3 during use, but also avoids the loosening problem that may be caused by the traditional fixing method, thereby ensuring the safety and reliability of the caster assembly during long-term use.

[0033] Further, as Figures 1-7 shown, a caster assembly for a square tube, wherein the fixing portion 23 is located on both sides of the housing 2 and protrudes from the surface of the housing 2. One end of the housing 2 is further provided with a second positioning end 24, and the second positioning end 24 is used to limit the depth of the housing 2 inserted into the inner cavity of the square tube. A chamfer is provided on the side of the fixing portion 23 away from the second positioning end 24. The cross-section of the fixing portion 23 is triangularly arranged, and the inclined surface becomes wider from top to bottom. The fixing portion 23 has elasticity.

[0034] In the present utility model, the fixing portion 23 is provided with a chamfer and the cross-section of the fixing portion 23 is triangular. At the same time, the elastic fixing portion 23 cooperates with the gradually widening inclined surface. This setting provides a better assembly effect and an elastic fixing effect. Not only can the housing 2 conform to the structure of the inner cavity of the square tube during the process of inserting the housing 2 into the inner cavity of the square tube, making it easier to install the housing 2 into the inner cavity of the square tube, but also the fixing portion 23 can be closely abutted against the inner wall of the inner cavity of the square tube after the housing 2 is inserted, thereby firmly fixing the housing 2 in the inner cavity of the square tube, improving the installation efficiency and the durability of the components. Further, the setting of the second positioning end 24 effectively limits the insertion depth of the housing 2. When the housing 2 extends into the inner cavity of the square tube, the second positioning end 24 abuts against the housing 2, effectively limiting the depth of the housing 2 extending into the inner cavity of the square tube, ensuring the accurate installation and stability of the caster assembly.

[0035] Further, as Figure 1 、 Figure 2 and Figure 5 shown, a caster assembly for a square tube, wherein the fastener 4 is a rivet, and the mounting hole 22 and the connection hole 31 are connected by riveting so that the caster 3 is fixed in the inner cavity 21 of the housing.

[0036] The present utility model connects the housing 2 and the caster 3 by riveting. This setting provides a more firm connection method for the housing 2 and the caster 3, reduces the possibility of loosening at the connection, thereby enhancing the overall stability and durability of the caster assembly, and ensuring the safety and reliability of the equipment during the moving process.

[0037] Further, as Figure 3 、 Figure 4 、 Figure 6 and Figure 7 shown, a caster assembly for a square tube, wherein the fastener 4 is a pin, and the mounting hole 22 and the connection hole 31 are respectively in tight fit connection with the pin so that the caster 3 is fixed in the inner cavity 21 of the housing.

[0038] The present utility model only needs to pass the pin through the mounting hole 22 and the connection hole 31 to realize the fixed connection between the caster 3 and the housing 2. This setting simplifies the installation and disassembly process of the caster assembly, improves the installation and maintenance efficiency. Further, the pin ensures the accuracy and firmness of the connection through the tight fit connection with the mounting hole 22 and the connection hole 31, thereby enhancing the stability and durability of the caster assembly, avoiding the problem of loosening or falling off of the caster 3 caused by insecure connection, and further improving the safety and reliability of the overall equipment.

[0039] Further, as Figure 3 、 Figure 4 、 Figure 6 and Figure 7A caster assembly for a square tube is shown, wherein a limiting end 221 is further provided on one side of the mounting hole 22, a limiting groove 41 is provided at one end of the fastener 4, and a first positioning end 42 is provided on one side of the limiting groove 41. The limiting end 221 cooperates with the limiting groove 41 to fix the direction of the fastener 4, and the first positioning end 42 abuts against the housing 2 to fix the position of the fastener 4.

[0040] Through the cooperation of the limiting end 221 and the limiting groove 41, the present utility model can effectively fix the direction of the fastener 4, prevent it from rotating during use, thereby ensuring the stability and reliability of the caster assembly; further, during the connection of the housing 2 and the caster 3, through the abutment of the first positioning end 42 of the fastener 4 against the inner wall of the inner cavity 21 of the housing 2, the relative position of the fastener 4 is ensured to be fixed, ensuring that the fastener 4 is installed in place, avoiding the risk of the caster 3 falling off due to the loosening of the fastener 4, and improving the safety and durability of the overall equipment.

[0041] Further, as Figure 5 and Figure 6 shown, a caster assembly for a square tube, wherein a reinforcing plate 25 is further provided at one end of the housing 2 away from the second positioning end 24.

[0042] By providing the reinforcing plate 25 on one side of the housing 2 that first extends into the inner cavity of the square tube, the present utility model strengthens the structure of the housing 2, preventing the deformation of the housing 2 caused by the elastic deformation of the fixing portion 23 during the process of the housing 2 extending into the inner cavity of the square tube, thereby ensuring the shape stability and strength of the housing 2 during the fixing process, and improving the overall load-bearing capacity and long-term use reliability of the caster assembly.

[0043] Further, as Figures 1-7 shown, a caster assembly for a square tube, wherein first grooves 27 are provided on both sides of the housing 2, the mounting holes 22 are located in the first grooves 27, and a plurality of ribs 26 extending along the mounting direction of the housing 2 are provided in the inner cavity 21 of the housing.

[0044] By providing the first grooves 27 on both sides of the housing 2, the present utility model can effectively prevent the fastener 4 from protruding from the surface of the housing 2, thereby avoiding interference between the fastener 4 and the square tube, and reducing the risk of installation difficulties or damage caused by interference; further, by providing a plurality of ribs 26 along the mounting direction of the housing 2 in the inner cavity 21 of the housing, the present utility model can further enhance the structural strength of the housing 2, which helps to improve the load-bearing capacity and durability of the caster assembly, ensure stability during long-term use, and thus improve the safety and reliability of the overall equipment.

[0045] Further, as Figures 1-7A caster assembly for square tubes as shown, wherein the external shape of the housing 2 is adapted to the shape of the inner cavity of the square tube.

[0046] In the present utility model, the external shape of the housing 2 is adapted to the shape of the inner cavity of the square tube, enabling the caster assembly to be more closely combined with the square tube. This setting enhances the fixing effect between the caster assembly and the square tube, reduces the risk of loosening or detachment caused by mismatch, and further ensures the safety and stability of equipment use.

[0047] Furthermore, as Figure 1 、 Figure 2 and Figure 5 shown, a caster assembly for square tubes, wherein a second groove 28 is further provided on one side of the mounting hole 22.

[0048] In the present utility model, by providing the second groove 28 on one side of the mounting hole 22, it can effectively prevent the problem that after the caster 3 and the housing 2 are connected by press riveting, the punched rivet protrudes from the surface of the housing 2, thus scratching or damaging users or articles.

[0049] Furthermore, as Figure 3 、 Figure 4 and Figure 6 shown, a caster assembly for square tubes, wherein reinforcing blocks 29 are further provided at the mounting holes 22 on both sides of the housing 2.

[0050] In the present utility model, the reinforcing blocks 29 are provided at the mounting holes 22 on both sides of the housing 2. When using a pin to connect the caster 3 and the housing 2, it can enhance the strength of the connection between the housing 2 and the caster 3, ensure the stability and durability of the caster assembly during long-term use, and reduce the risk of damage or detachment caused by insufficient housing strength.

[0051] Furthermore, as Figures 1-9 shown, a movable square tube rack, which further includes a square tube rack 5.

[0052] In the present utility model, the combination of the square tube rack 5 and the caster assembly improves the flexibility of the square tube rack 5, enabling the square tube rack 5 to be easily pushed to different positions. This setting not only reduces the physical labor of the staff but also improves the operation efficiency; furthermore, this setting enhances the applicable range of the square tube rack 5, enabling it to adapt to a variety of different application scenarios, thus enhancing the practicality of the square tube rack 5.

[0053] Furthermore, as Figures 1-9 shown, a movable square tube rack, wherein a plurality of snap grooves 51 are provided on both sides of the square tube rack 5 near one end of the caster 3, and the snap grooves 51 cooperate with the fixing portion 23 to connect the square tube rack 5 and the housing 2.

[0054] On both sides of the square tube frame 5 near one end of the caster 3, there are snap grooves 51. Through the snap fit between the fixing part 23 and the snap grooves 51, the quick connection and disassembly of the square tube frame 5 and the housing 2 are realized. This setting simplifies the installation process, improves the flexibility of the overall structure, and maintains the stability of the connection.

[0055] As Figures 1-9 shown, the implementation method of this embodiment is as follows:

[0056] Embodiment 1:

[0057] In this embodiment, the fastener 4 is a pin. There are first grooves 27 on both sides of the housing 2, and the mounting holes 22 are located in the first grooves 27 to prevent the fastener 4 from protruding from the surface of the housing 2 and interfering with the square tube. There are multiple ribs 26 in the inner cavity 21 of the housing to enhance the overall strength of the housing 2. The external shape of the housing 2 is adapted to the shape of the inner cavity of the square tube to prevent the caster assembly from loosening after being installed in the inner cavity of the square tube. There are reinforcement blocks 29 at the mounting holes 22 on both sides of the housing 2, which can enhance the strength of the connection between the housing 2 and the caster 3 when using a pin to connect the caster 3 and the housing 2.

[0058] During the installation of the caster assembly, first insert the caster 3 into the inner cavity 21 of the housing to ensure that the mounting hole 22 is aligned with the connection hole 31. Then, insert the pin through the mounting hole 22 and the connection hole 31 to realize the connection between the caster 3 and the housing 2. During the process of connecting the caster 3 and the housing 2 with a pin, it is necessary to ensure that the limiting end 221 cooperates with the limiting groove 41 to fix the direction of the fastener 4, and push the first positioning end 42 of the pin to the inner wall of the inner cavity 21 of the housing so that the first positioning end 42 abuts against the inner wall of the inner cavity 21 of the housing to ensure that the fastener 4 will not easily come out. After completing the above steps, insert the housing 2 into the inner cavity of the square tube until the second positioning end 24 contacts the square tube, thus completing the installation. During the process of inserting the housing 2 into the inner cavity of the square tube, the fixing part 23 will elastically deform towards the inner cavity 21 of the housing. Since the fixing part 23 is provided with a chamfer, the housing 2 can be more easily installed into the inner cavity of the square tube. When the housing 2 is inserted into the inner cavity of the square tube, the fixing part 23 will always apply a force to the inner cavity of the square tube to ensure that the housing 2 is in close contact with the inner wall of the inner cavity of the square tube, thereby firmly fixing the housing 2 in the inner cavity of the square tube.

[0059] Embodiment 2:

[0060] This embodiment is similar to the features and installation steps in Embodiment 1, the difference being that there is a reinforcing plate 25 on one side of the housing 2 where it first extends into the inner cavity of the square tube. This setting strengthens the structure of the housing 2 and prevents the housing 2 from deforming when the fixing part 23 applies a force to the inner wall of the inner cavity of the square tube during the process of the housing 2 extending into the inner cavity of the square tube.

[0061] Embodiment 3:

[0062] This embodiment is similar to the features in Embodiment 1, except that in this embodiment, the fastener 4 is a rivet, and the housing 2 and the caster 3 are connected by riveting. Moreover, no reinforcing blocks 29 are provided on both sides of the housing 2. Instead, a second groove 28 is provided on one side of the mounting hole 22. The limiting end 221 is not provided in the mounting hole 22 either.

[0063] During the installation process of the caster assembly, first, insert the caster 3 into the inner cavity 21 of the housing to ensure that the mounting hole 22 is aligned with the connection hole 31. Subsequently, pass the rivet through the mounting hole 22 and the connection hole 31 and then perform riveting to realize the connection between the caster 3 and the housing 2. The subsequent cooperation process between the caster assembly and the square pipe is the same as that in Embodiment 1.

[0064] Embodiment 4:

[0065] This embodiment is similar to the features and installation steps in Embodiment 3, except that a reinforcing plate 25 is provided on one side of the housing 2 that first extends into the inner cavity of the square pipe. This setting strengthens the structure of the housing 2 and prevents the housing 2 from deforming when the fixing portion 23 exerts a force on the inner wall of the inner cavity of the square pipe during the process of the housing 2 extending into the inner cavity of the square pipe.

[0066] Embodiment 5:

[0067] This embodiment is similar to the features and the installation steps of the caster assembly in Embodiment 1, except that this embodiment further includes a square pipe frame 5. Clamping grooves 51 are provided on both sides of the square pipe frame 5. When the housing 2 is inserted into the inner cavity of the square pipe, the fixing portion 23 on the housing will cooperate with the clamping grooves 51 to realize the fixed connection between the housing 2 and the square pipe frame 5.

[0068] Embodiment 6:

[0069] This embodiment is similar to the features and the installation steps of the caster assembly in Embodiment 2, except that this embodiment further includes a square pipe frame 5. Clamping grooves 51 are provided on both sides of the square pipe frame 5. When the housing 2 is inserted into the inner cavity of the square pipe, the fixing portion 23 on the housing will cooperate with the clamping grooves 51 to realize the fixed connection between the housing 2 and the square pipe frame 5.

[0070] Embodiment 7:

[0071] This embodiment is similar to the features and the installation steps of the caster assembly in Embodiment 3, except that this embodiment further includes a square pipe frame 5. Clamping grooves 51 are provided on both sides of the square pipe frame 5. When the housing 2 is inserted into the inner cavity of the square pipe, the fixing portion 23 on the housing will cooperate with the clamping grooves 51 to realize the fixed connection between the housing 2 and the square pipe frame 5.

[0072] Embodiment 8:

[0073] This embodiment is similar to the features in Embodiment 4 and the installation steps of the caster assembly. The difference is that this embodiment further includes a square pipe frame 5. Clamping grooves 51 are provided on both sides of the square pipe frame 5. When the housing 2 is inserted into the inner cavity of the square pipe, the fixing part 23 on the housing will cooperate with the clamping grooves 51 to achieve the fixed connection between the housing 2 and the square pipe frame 5.

[0074] The above only uses embodiments to further illustrate the technical content of the present invention to make it easier for readers to understand, but it does not mean that the implementation modes of the present invention are limited to this. Any technical extension or re-creation based on the present invention is protected by the present invention. The protection scope of the present invention is subject to the claims.

Claims

1. A caster assembly for a square tube, comprising a component body (1), characterized in that: The component body (1) includes a housing (2) and casters (3) connected to the housing (2). The housing (2) is provided with a fixing portion (23). The housing (2) extends into the inner cavity of the square tube and is fixed in the inner cavity of the square tube through the fixing portion (23).

2. The caster assembly for a square pipe according to claim 1, wherein: The housing (2) is provided with an inner cavity (21) of the housing. The component body (1) further includes a fastener (4). One side of the housing (2) is further provided with a mounting hole (22) penetrating through the housing (2). The caster (3) is provided with a connection hole (31). The mounting hole (22) and the connection hole (31) are connected through the fastener (4) so that the caster (3) is fixed in the inner cavity (21) of the housing.

3. The caster assembly for square tubes according to claim 1, characterized in that: The fixing portion (23) is located on both sides of the housing (2) and protrudes from the surface of the housing (2). One end of the housing (2) is further provided with a second positioning end (24). The second positioning end (24) is used to limit the depth of the housing (2) extending into the inner cavity of the square tube. A chamfer is provided on the side of the fixing portion (23) away from the second positioning end (24). The cross-section of the fixing portion (23) is triangularly arranged, and the inclined surface becomes wider from top to bottom. The fixing portion (23) has elasticity.

4. The caster assembly for square tubes according to claim 2, characterized in that: The fastener (4) is a rivet. The mounting hole (22) and the connection hole (31) are connected by riveting so that the caster (3) is fixed in the inner cavity (21) of the housing.

5. The caster assembly for a square tube according to claim 2, characterized in that: The fastener (4) is a pin. The mounting hole (22) and the connection hole (31) are respectively tightly fitted with the pin so that the caster (3) is fixed in the inner cavity (21) of the housing.

6. The caster assembly for square tubes according to claim 2, characterized in that: A limiting end (221) is further provided on one side of the mounting hole (22). One end of the fastener (4) is provided with a limiting groove (41). A first positioning end (42) is provided on one side of the limiting groove (41). The limiting end (221) and the limiting groove (41) cooperate to fix the direction of the fastener (4). The first positioning end (42) abuts against the housing (2) to fix the position of the fastener (4).

7. The caster assembly for square tubes according to claim 3, characterized in that: A reinforcing plate (25) is further provided at one end of the housing (2) away from the second positioning end (24).

8. The caster assembly for square tubes according to claim 2, wherein: First grooves (27) are provided on both sides of the housing (2). The mounting hole (22) is located in the first groove (27). A plurality of ribs (26) extending along the mounting direction of the housing (2) are provided in the inner cavity (21) of the housing.

9. A movable square pipe rack, characterized in that: It includes a caster assembly for a square tube according to any one of claims 1-8, and further includes a square tube frame (5).

10. The movable square pipe frame according to claim 9, characterized in that: A plurality of buckle grooves (51) are provided on both sides of one end of the square tube frame (5) close to the caster (3). The buckle grooves (51) cooperate with the fixing portion (23) so that the square tube frame (5) is connected to the housing (2).

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