A hinge door guide wheel

Abstract

The utility model discloses a pivot door guide wheel, aim at solving pivot door bottom support, guide and height adaptation problem. The guide wheel contains the assembly board, and its clamping edge can be connected with pivot door bottom clamping, the base is located on the side of the assembly board away from the door body, has the guide wheel assembly hole, height adjusting hole and avoidance hole, the assembly piece passes through the avoidance hole and locks the assembly board with the bottom of the door body, the universal wheel mechanism is installed in the guide wheel assembly hole, can adjust flexibly according to the door body rotation direction, provides stable support for the bottom of the door body, disperses gravity, avoids shaking, guarantees the smooth opening and closing, reduces the damage to the door body structure, prolongs the life, the height adjusting hole is passed through with the assembly board axial location connection of height -adjusting mechanism, its threaded portion is connected with height adjusting hole screw thread, by rotating the height -adjusting mechanism to adjust the interval distance between the base and the assembly board, can adapt to pivot door of different height, need not to transform the door body, reduce the installation difficulty and cost, improve the installation adaptation degree.

Description

Technical Field

[0001] This utility model relates to the field of guide wheel technology, and in particular to a guide wheel for a rotating door. Background Technology

[0002] In modern architecture, hinged doors are widely used in various venues, such as shopping malls, hotels, office buildings, and high-end residences, due to their unique opening mechanism and elegant appearance. Hinged doors typically use a central or edge hinge to support the entire door, enabling the door to open and close by rotation. This design gives hinged doors a smooth, dynamic effect during opening and closing, adding a touch of dynamism and style to the architecture.

[0003] Most common hinged door guide structures are located at the top of the door, while the bottom is left unsupported. This design simplifies the bottom structure of the door to some extent, reduces friction between the bottom and the ground, and makes the door easier to rotate. When the hinge of a hinged door is located on one side of the door, this structure can generally meet the normal opening and closing needs during initial use.

[0004] However, with increased usage time, existing hinged doors have gradually revealed some problems that cannot be ignored. Due to the lack of effective support and guiding devices at the bottom of the door, relying solely on the top guide structure to maintain stability, when the hinge is located on one side of the door, the weight distribution is uneven, and the other side is subjected to continuous gravity. Over long-term use, this gravitational influence gradually accumulates, causing swaying on the other side. This swaying not only affects the smoothness of opening and closing the door, causing jamming and abnormal noises, reducing the user experience, but also damages the door structure, accelerates the wear of door components, and shortens the door's lifespan. Furthermore, in some mechanisms that install guide wheels at the bottom of the door, due to the varying heights of different hinged doors, traditional guide wheels are usually designed with a fixed height and cannot be adjusted according to the actual height of the installed hinged door. This means that if the guide wheel height does not match the door height during installation, additional modifications to the door are required, increasing installation difficulty and cost. Utility Model Content

[0005] The purpose of this utility model is to disclose a pivot door guide wheel, which is installed at the bottom of the door body and uses a universal wheel mechanism to provide support and guidance when the door body rotates. It also has a height adjustment function, which can meet the needs of pivot doors of various heights and improve the installation adaptability.

[0006] To achieve the above objectives, this utility model discloses a guide wheel for a pivot door, comprising: an assembly plate having a snap-fit ​​edge for engaging with the bottom of a pivot door; a base located on the side of the assembly plate away from the pivot door, the base having a guide wheel assembly hole, a height adjustment hole, and a clearance hole; an assembly fitting passing through the clearance hole and used to lock the assembly plate to the bottom of the pivot door; a caster wheel mechanism installed in the guide wheel assembly hole; and a height adjustment mechanism including a threaded portion threadedly connected to the height adjustment hole, the height adjustment mechanism being axially limited by the assembly plate, and the distance between the base and the assembly plate being adjusted by rotating the height adjustment mechanism.

[0007] By adopting the above solution, the caster wheel mechanism can flexibly adjust according to the rotation direction of the door, providing stable support for the bottom of the door, effectively distributing the weight of the door, and avoiding swaying due to excessive force on one side. This ensures the smoothness of the door opening and closing process, reduces jamming and abnormal noise, improves the user experience, and at the same time reduces damage to the door structure and extends the service life of the door. The height adjustment mechanism passes through the height adjustment hole on the base and is axially limited to the mounting plate. Rotating the height adjustment mechanism can adjust the interval distance between the base and the mounting plate. It can flexibly adjust the overall height of the guide wheels according to the different heights of the hinge doors, so that it matches the height of the door. There is no need to modify the door, which reduces the difficulty and cost of installation and improves the installation adaptability.

[0008] Furthermore, the height adjustment mechanism includes: an abutment member abutting against the side of the assembly plate away from the base; an adjustment rod including a first columnar segment, a second columnar segment, and a third columnar segment connected in sequence with decreasing diameters, the threaded portion being located on the first columnar segment, and a stepped portion between the first and second columnar segments for abutting against the side of the assembly plate near the base; the third columnar segment being fixedly connected to the abutment member.

[0009] By adopting the above solution, the gap between the base and the mounting plate can be precisely adjusted by simply rotating the adjusting rod. In practical applications, the height of the guide wheels can be flexibly adjusted according to the actual installation conditions of different hinged doors, differences in ground flatness, and the condition of the door itself. This ensures good contact between the guide wheels and the ground, providing stable and reliable support and guidance for the door. It effectively solves problems such as door swaying and unevenness caused by height mismatch, greatly enhancing the versatility and adaptability of the guide wheels and improving the overall stability and safety of the hinged door operation.

[0010] Furthermore, the mounting plate has a receiving groove on the side away from the base for accommodating the abutment, and the abutment does not protrude from the receiving groove.

[0011] By adopting the above solution, a certain limiting effect can be provided for the abutting parts, while avoiding vertical space occupation and improving space utilization.

[0012] Furthermore, the first columnar segment is provided with an operating part, which is a plurality of vertical anti-slip stripes, planes or grooves arranged along the circumference of the first columnar segment.

[0013] By adopting the above solution, the multiple vertical anti-slip stripes, planes or grooves in the circumference can greatly increase the friction between the hand and the operating section, effectively preventing slippage during rotation, ensuring that the operator can apply force accurately and stably, and quickly and accurately complete the height adjustment, greatly improving the adjustment efficiency and operating experience, and enabling the pivot door guide wheel to better adapt to different installation environments and usage needs.

[0014] Furthermore, it also includes a guide member, which is fixedly connected to the base. The guide member has a guide post protruding from the side facing the assembly plate. The assembly plate has a guide hole corresponding to the guide post. The guide post is parallel to the adjusting rod.

[0015] By adopting the above solution, the guide column provides precise guidance for the vertical movement of the assembly plate relative to the base, ensuring that when the height is adjusted by rotating the adjustment rod, the assembly plate can only move smoothly in the vertical direction without deviation or shaking, which greatly improves the accuracy and stability of height adjustment.

[0016] Furthermore, the relative displacement between the first columnar segment and the height adjustment hole is not greater than the relative displacement between the guide post and the guide hole.

[0017] By adopting the above solution, the height adjustment mechanism is prevented from detaching from the guide column when adjusting the height, thus maintaining a continuous guiding effect.

[0018] Furthermore, the height adjustment hole is located in the center of the base, and the guide wheel mounting hole and the clearance hole are respectively located on both sides of the height adjustment hole.

[0019] By adopting the above scheme, the height adjustment mechanism, being located in the center of the base, maintains stable weight on both sides when adjusting the height, thereby improving the stability and smoothness of the base during height adjustment.

[0020] Furthermore, the bottom surface of the base is configured such that the distance between the bottom surface and the top surface gradually increases from the side with the guide wheel mounting hole to the side with the clearance hole, and the maximum distance between the top surface and the bottom surface of the base is not greater than the sum of the longitudinal heights of the base and the caster wheel mechanism.

[0021] By adopting the above solution, the stability of the structure is greatly optimized. This gradual structure causes the center of gravity of the base to naturally shift away from the guide wheel mounting holes. When the caster mechanism is mounted in the guide wheel mounting holes, it can form a balance with the base, keeping the weight distribution on both sides of the base relatively stable. In this way, the weight distribution of the base and the supporting effect of the caster mechanism form a clever balance, optimizing the center of gravity distribution of the overall structure and making it more reasonable and stable.

[0022] Furthermore, a weight-reducing groove is provided on the side of the base near the universal wheel mechanism.

[0023] By adopting the above solution, the overall weight of the base is reduced, making the guide wheels lighter and reducing the load on the entire hinge door. This reduces the power required for the door to rotate, making operation easier and smoother. Functionally, the reduced weight prevents the base from tilting due to excessive weight on the caster mechanism, ensuring the casters rotate freely and better perform their supporting and guiding functions. This effectively prevents door wobbling and jamming caused by base swaying, improving the stability and reliability of the hinge door's operation and extending its service life.

[0024] Furthermore, the omnidirectional wheel mechanism includes: a wheel frame; a wheel body rotatably connected to the wheel frame; a wheel frame nut disposed on the top surface of the base; a wheel frame fixing member passing through the wheel frame and the base, and threadedly connected to the wheel frame nut; and a bearing disposed between the wheel frame fixing member and the base for providing rotational lubrication.

[0025] By adopting the above solution, the wheel body is rotatably connected within the wheel frame, giving it flexible rotation characteristics and easily adapting to the movement requirements of the swivel door in different directions. The wheel frame nut is located on the top surface of the base, and the wheel frame fixing component passes through the wheel frame and the base and is threadedly connected to it. This connection method is stable and reliable, ensuring that the wheel frame and the base are tightly connected, providing stable support for the universal wheel mechanism. The bearing is located between the wheel frame fixing component and the base to provide rotational lubrication, greatly reducing the frictional resistance between components, making the wheel body rotate more smoothly and effortlessly, effectively reducing wear, extending the service life of the universal wheel mechanism, and thus ensuring the long-term stable and efficient operation of the swivel door.

[0026] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. By placing the caster wheel mechanism at the bottom of the pivot door, it provides effective bottom support and flexible guidance for the door body, which can significantly improve the problem of sinking and shaking on the other side of the door body caused by long-term use, improve the stability and smoothness of the door body operation, and extend the service life. 2. A height adjustment mechanism is designed, allowing for precise adjustment of the distance between the base and the mounting plate through a simple rotation, thus adapting to hinged doors of different heights and uneven ground. This greatly improves the product's versatility and ease of installation, eliminating the need for additional door modifications and reducing installation costs; 3. The guide wheel is an independent modular component, which eliminates the need for pre-embedded tracks or grooves in the ground during installation, greatly simplifying the installation process and reducing the requirements for modifying the building foundation and the installation cost. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model; Figure 2 This is a partial exploded structural diagram of an embodiment of the present invention; Figure 3 This is a partial exploded structural diagram of an embodiment of the present invention; Figure 4 This is an exploded view of the universal wheel mechanism according to an embodiment of the present utility model; Figure 5 This is a cross-sectional structural diagram of an embodiment of the present utility model.

[0029] Explanation of key figure labels: 100. Base; 110. Guide wheel mounting hole; 120. Height adjustment hole; 130. Weight reduction groove; 140. Clearance hole; 150. Guide hole; 160. Receiving groove; 200. Assembly plate; 210. Snap-fit ​​edge; 300. Assembly parts; 400. Universal wheel mechanism; 410. Wheel frame; 420. Wheel body; 430. Wheel frame nut; 440. Wheel frame fixing part; 450. Bearing; 500. Height adjustment mechanism; 510. Abutment part; 520. Adjusting rod; 521. First columnar section; 522. Second columnar section; 523. Third columnar section; 524. Stepped part; 525. Operating part; 530. Guide part; 531. Guide column. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0032] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0033] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0034] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0035] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0036] See Embodiment 1 of this utility model. Figure 1-5As shown, a pivot door guide wheel is disclosed, including a base 100, an assembly plate 200, an assembly part 300, a caster wheel mechanism 400, and a height adjustment mechanism 500. The assembly plate 200 is used to directly connect to the bottom of the pivot door (not shown in the figure). The edges on both sides of the assembly plate 200 are provided with outwardly extending snap-fit ​​edges 210, which are used to snap the bottom edge of the door or snap with the profile at the bottom of the door body during installation for initial positioning and limiting.

[0037] The base 100 is located below the mounting plate 200, on the side away from the pivot door. The base 100 has three main functional holes: a guide wheel mounting hole 110 for mounting the caster wheel mechanism 400, a height adjustment hole 120 for mounting the height adjustment mechanism 500, and a clearance hole 140 for the assembly 300 to pass through. Preferably, the height adjustment hole 120 is located in the center of the base 100, while the guide wheel mounting hole 110 and the clearance hole 140 are respectively located on either side of the height adjustment hole 120. This symmetrical layout helps maintain stability during adjustment. Furthermore, the bottom surface of the base 100 is designed as a slope or stepped shape. From the guide wheel mounting hole 110 towards the clearance hole 140, the thickness of the base, i.e., the distance between the bottom and top surfaces, gradually increases, forming a stable wedge-shaped structure.

[0038] In some embodiments, lightweight design can be implemented for parts of the base 100. A weight-reducing groove 130 is provided on the side of the base 100 near the universal wheel mechanism 400. This weight-reducing groove 130 can effectively reduce material usage and overall weight while maintaining the structural strength of the base 100. Simultaneously, it reduces the counterweight on the side of the base 100 near the universal wheel mechanism 400, thereby balancing the weight of the entire guide wheel around the adjusting rod 520. This not only makes the product lighter, reducing transportation and installation costs, but also reduces the additional load on the door, making the universal wheel mechanism rotate more flexibly and respond more quickly.

[0039] It should be noted that either the weight-reducing groove 130 or the wedge structure can be selected or both can coexist.

[0040] In this embodiment 1, the assembly 300 is usually a screw or bolt, which passes through the clearance hole 140 on the base 100 and is screwed or interference-fitted to the corresponding hole on the assembly plate 200, and finally abuts and fixes to the bottom of the pivot door or the bottom profile, so as to firmly lock the entire guide wheel on the door body.

[0041] The universal wheel mechanism 400 mainly includes a wheel frame 410, a wheel body 420, a wheel frame nut 430, a wheel frame fixing member 440, and a bearing 450. The wheel body 420 is rotatably connected to the wheel frame 410 via components such as a pin, allowing it to rotate around its own axis. The wheel frame nut 430 is fixedly disposed on the top surface of the base 100. In this embodiment 1, the wheel frame nut 430 is embedded in the top surface of the base 100. Its position corresponds to the guide wheel mounting hole 110. Care should be taken to avoid any protrusions on the top surface. The wheel frame fixing member 440 can be a bolt, which passes through the through holes in the wheel frame 410 and the base 100 sequentially from bottom to top, and finally is threadedly connected to the wheel frame nut 430, thereby fastening the entire universal wheel mechanism 400 to the base 100.

[0042] The bearing 450 is disposed between the head of the wheel frame fixing member 440 and the bottom surface of the base 100, or integrated at the contact interface between the wheel frame 410 and the base 100. The function of the bearing 450 is to reduce the frictional resistance of the universal wheel mechanism 400 when it rotates in the horizontal plane, making its steering more flexible and smooth, and extending its service life.

[0043] The height adjustment mechanism 500 is a core component, and in this embodiment 1, it mainly includes an abutment member 510 and an adjusting rod 520. The adjusting rod 520 has a three-section structure: a first columnar section 521, a second columnar section 522, and a third columnar section 523 with successively decreasing diameters. The first columnar section 521 is threadedly connected to the height adjustment hole 120 on the base 100. A stepped portion 524 is formed between the first columnar section 521 and the second columnar section 522. A through hole is opened on the mounting plate 200, through which the second columnar section 522 passes, allowing the stepped portion 524 to abut against the side of the mounting plate 200 near the base 100. The end of the third columnar section 523 is fixedly connected to the abutment member 510, including but not limited to threaded connection, riveting, or pin connection, while the abutment member 510 abuts against the side of the mounting plate 200 away from the base 100. In this way, the adjusting rod 520, the stepped part 524 and the abutting part 510 together form an "I"-shaped snap-fit ​​limiting structure on the upper and lower sides of the assembly plate 200, limiting the assembly plate 200 therein, while the adjusting rod 520 can rotate relative to the assembly plate 200.

[0044] When height adjustment is required, use a tool or manually rotate the adjusting rod 520. Since the adjusting rod 520 is threadedly connected to the base 100, rotation causes axial movement of the adjusting rod 520. Because the mounting plate 200 is limited by the abutment 510 and the stepped portion 524, the axial movement of the adjusting rod 520 pushes or pulls the mounting plate 200, thereby changing the distance between the base 100 and the mounting plate 200, achieving stepless adjustment of the overall height. For ease of operation, an operating portion 525 is provided on the outer periphery of the first columnar section 521, such as multiple vertical anti-slip stripes, a flat surface, or a groove.

[0045] In some embodiments, a guide member 530 is provided to ensure that the assembly plate 200 can only move vertically without deflection during adjustment. The guide member 530 is fixedly connected to the base 100, and a guide post 531 parallel to the adjusting rod 520 is protruding on it. A guide hole 150 is correspondingly opened on the assembly plate 200, and the guide post 531 is inserted into the guide hole 150. To ensure that the guiding effect is always effective, the design ensures that the maximum adjustable relative displacement between the first columnar segment 521 and the height adjustment hole 120 is not greater than the effective engagement stroke of the guide post 531 within the guide hole 150.

[0046] Alternatively, a receiving groove 160 can be provided on the side of the mounting plate 200 away from the base 100 to receive the abutment 510, ensuring that the abutment 510 does not protrude from the receiving groove, so that the mounting plate 200 can be flatly attached to the bottom of the hinge door.

[0047] In some embodiments, the top surface of the base 100 is optionally recessed inward to form a mounting groove. The thickness of the mounting plate 200 is precisely designed to match the depth of the mounting groove. This ensures that when the mounting plate 200 is installed into the mounting groove, its top surface is flush with the top surface of the base 100. This design results in a smoother connection between the guide wheel and the bottom of the door, not only improving the appearance and reducing the risk of interference or scratches caused by protrusions, but also enhancing the stability and integrity of the entire assembly's connection to the door.

[0048] The installation and adjustment process of this utility model is as follows: First, screw the adjusting rod 520 of the height adjustment mechanism 500 into the base 100, and pass it through the mounting plate 200 to connect with the abutment 510 above it. At this time, a fixed limiting space is formed between the abutment 510 and the stepped portion 524 on the adjusting rod 520, so that the mounting plate 200 is just limited within the limiting space. At this time, the distance between the mounting plate 200 and the base 100 can be adjusted by rotating the adjusting rod 520. First, adjust it to the minimum distance between the base 100 and the mounting plate 200. Then, snap the snap-fit ​​edge 210 of the mounting plate 200 into the bottom of the pivot door. After sliding to the appropriate position, pass the fitting 300 through the clearance hole 140 and the mounting plate 200 in sequence, and initially screw it into the bottom of the pivot door, but do not fully lock it yet. Rotate the adjusting rod 520 of the height adjustment mechanism 500 so that the wheel 420 of the universal wheel mechanism 400 contacts the ground and reaches a suitable support height, so that the door remains vertical and stable. Finally, fully lock the fitting 300 to complete the installation.

[0049] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A pivot door guide wheel, characterized in that, include: Assembly plate (200) having a snap-fit ​​edge (210) for snapping into the bottom of the pivot door; A base (100) is provided on the side of the mounting plate (200) away from the pivot door. The base (100) is provided with a guide wheel mounting hole (110), a height adjustment hole (120) and a clearance hole (140). Assembly (300) passes through the clearance hole (140) and is used to lock the assembly plate (200) to the bottom of the pivot door; A caster wheel mechanism (400) is mounted in the guide wheel mounting hole (110); The height adjustment mechanism (500) includes a threaded portion that is threadedly connected to the height adjustment hole (120). The height adjustment mechanism (500) is axially limited to the mounting plate (200). The distance between the base (100) and the mounting plate (200) can be adjusted by rotating the height adjustment mechanism (500).

2. A pivot door guide wheel according to claim 1, characterized in that, The height adjustment mechanism (500) includes: Abutting member (510) abuts against the side of the mounting plate (200) away from the base (100); An adjusting rod (520) includes a first columnar segment (521), a second columnar segment (522), and a third columnar segment (523) connected in sequence with decreasing diameters. The threaded portion is located on the first columnar segment (521). A stepped portion (524) is provided between the first columnar segment (521) and the second columnar segment (522) for abutting against the side of the mounting plate (200) near the base (100). The third columnar segment (523) is fixedly connected to the abutting member (510).

3. A pivot door guide wheel according to claim 2, characterized in that, The mounting plate (200) has a receiving groove (160) on the side away from the base (100) for accommodating the abutment (510), and the abutment (510) does not protrude from the receiving groove (160).

4. A pivot door guide wheel according to claim 2, characterized in that, The first columnar segment (521) is provided with an operating part (525), which is a plurality of vertical anti-slip stripes, planes or grooves arranged circumferentially along the first columnar segment (521).

5. A pivot door guide wheel according to claim 2, characterized in that, It also includes a guide member (530), which is fixedly connected to the base (100). The guide member (530) has a guide post (531) protruding on the side facing the assembly plate (200). The assembly plate (200) has a guide hole (150) corresponding to the guide post (531). The guide post (531) is parallel to the adjusting rod (520).

6. A pivot door guide wheel according to claim 5, characterized in that, The relative displacement between the first columnar segment (521) and the height adjustment hole (120) is not greater than the relative displacement between the guide post (531) and the guide hole (150).

7. A pivot door guide wheel according to claim 1, characterized in that, The height adjustment hole (120) is located in the center of the base (100), and the guide wheel mounting hole (110) and the clearance hole (140) are respectively provided on both sides of the height adjustment hole (120).

8. A pivot door guide wheel according to claim 7, characterized in that, The bottom surface of the base (100) is configured such that the distance between the bottom surface and the top surface gradually increases from the side with the guide wheel mounting hole (110) to the side with the clearance hole (140), and the maximum distance between the top surface and the bottom surface of the base (100) is not greater than the sum of the longitudinal height of the base (100) and the universal wheel mechanism (400).

9. A pivot door guide wheel according to claim 1, characterized in that, The base (100) has a weight-reducing groove (130) on the side near the universal wheel mechanism (400).

10. A pivot door guide wheel according to claim 1, characterized in that, The universal wheel mechanism (400) includes: Wheel frame (410); Wheel body (420), the wheel body (420) is rotatably connected to the wheel frame (410); Wheel frame nut (430), the wheel frame nut (430) is disposed on the top surface of the base (100); A wheel frame fixing member (440) passes through the wheel frame (410) and the base (100) and is threadedly connected to the wheel frame nut (430); A bearing (450) is disposed between the wheel frame fixing member (440) and the base (100) for providing rotational lubrication.

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