Supporting wheel structure and box body

Abstract

The utility model discloses a supporting wheel structure and a box body. According to the scheme, the supporting wheel structure comprises a first positioning frame and a second positioning frame which are sequentially arranged in the vertical direction; the transmission rod extends in the vertical direction, the transmission rod is in threaded connection with the first positioning frame, and the transmission rod can rotate relative to the first positioning frame so that the transmission rod can ascend and descend in the vertical direction relative to the first positioning frame; the supporting rod extends in the vertical direction and is slidably connected to the second positioning frame in the vertical direction, and the top end of the supporting rod is connected with or abuts against the bottom end of the transmission rod; the trundles are arranged at the bottoms of the supporting rods; the trundles can ascend and descend along with ascending and descending of the transmission rod. By rotating the transmission rod, the transmission rod can vertically ascend or descend along the first positioning frame, then force is transmitted to the supporting rod connected to or abutting against the bottom of the transmission rod, then the supporting rod is driven to slidably ascend or descend along the second positioning frame, ascending or descending of the trundle arranged at the bottom of the supporting rod is achieved, the service life of the trundle is prolonged, and the service life of the trundle is prolonged. The bending risk of the transmission rod can be reduced, and the service life of the transmission rod is prolonged.

Description

Technical Field

[0001] This application relates to the field of support wheels, and in particular to a support wheel structure and housing. Background Technology

[0002] Some enclosures used to house and protect heavy items, equipment, or supplies are typically equipped with heavy-duty doors. To facilitate opening these doors and protect the hinges connecting the doors to the enclosure, casters are installed at the bottom of the doors. These casters directly contact the ground, distributing the weight of the door evenly and ensuring smooth opening and closing, thus protecting the door, the enclosure, and the connecting structure. However, since the casters are always in contact with the ground, they are prone to wear and tear, affecting their lifespan. Utility Model Content

[0003] To address the aforementioned problems, this application provides a support wheel structure.

[0004] According to one aspect of the embodiments of this application, a support wheel structure is disclosed, the support wheel structure including a first positioning frame and a second positioning frame arranged sequentially along the vertical direction;

[0005] A transmission rod extends vertically and is threadedly connected to the first positioning frame. The transmission rod is rotatable relative to the first positioning frame so that it can move vertically up and down relative to the first positioning frame.

[0006] A strut extends vertically and is slidably connected to the second positioning frame, the top end of the strut being connected to or abutting against the bottom end of the transmission rod;

[0007] Casters are located at the bottom of the support rod;

[0008] The casters are able to rise and fall with the movement of the transmission rod.

[0009] In one exemplary embodiment, a reset member, connected between the second positioning frame and the support rod, is configured to provide an upward force to the support rod so that the top end of the support rod remains in contact with the bottom end of the transmission rod.

[0010] In one exemplary embodiment, the outer periphery of the support rod is provided with a limiting structure, the limiting structure is spaced above the second positioning frame, and the reset member is located between the limiting structure and the second positioning frame;

[0011] The reset component is sleeved on the outer periphery of the support rod;

[0012] The reset element includes a compression spring.

[0013] In one exemplary embodiment, the reset member further includes a baffle connected to the top end of the compression spring; and / or

[0014] The limiting structure includes a pin that is detachably mounted on the support rod. At least one end of the pin extends axially from the outer wall of the support rod and is abutted by the reset member.

[0015] In one exemplary embodiment, the axial length of the transmission rod is less than the axial length of the support rod; and / or

[0016] The axial extension direction of the transmission rod coincides with the axial extension direction of the support rod.

[0017] In one exemplary embodiment, the support rod is hollow inside;

[0018] The inner bottom end of the support rod is fitted with a bushing, and the caster is threadedly connected to the bushing;

[0019] The top of the inner end of the support rod is sealed with a plug, and the transmission rod abuts against the plug.

[0020] In an exemplary embodiment, the second positioning frame includes an upper fixing plate and a lower fixing plate spaced apart vertically. The upper fixing plate and the lower fixing plate are used to be mounted on the door. The upper fixing plate is provided with an upper guide hole, and the lower fixing plate is provided with a lower guide hole. One axial end of the support rod extends upward through the upper guide hole and is connected to or abuts against the transmission rod. The other axial end of the support rod extends downward through the lower guide hole and is connected to the caster. The support rod can slide up and down relative to the upper guide hole and the lower guide hole.

[0021] In one exemplary embodiment, the first positioning frame includes a mounting plate spaced apart from the second positioning frame. The mounting plate is used to be mounted on the door and has a screw hole that engages with the transmission rod.

[0022] In one exemplary embodiment, a handle is provided at the end of the transmission rod away from the support rod;

[0023] The handle includes a base plate and a handle. The transmission rod and the handle are respectively connected to the two sides of the base plate along the vertical direction. The axis of the transmission rod and the axis of the handle are offset vertically.

[0024] According to one aspect of the embodiments of this application, a box body is disclosed, the box body including a box body structure having a door frame;

[0025] A door hinged to the door frame and used to open or close the door frame;

[0026] In the aforementioned support wheel structure, the first positioning frame and the second positioning frame are arranged vertically in sequence on the switch door, and the caster is located at the bottom of the switch door.

[0027] The technical solutions provided by the embodiments of this application have at least the following beneficial effects:

[0028] The support wheel structure disclosed in this application includes a first positioning frame, a second positioning frame, a transmission rod, a support rod, and casters. The first and second positioning frames are used to mount on external opening and closing doors. The transmission rod is threadedly connected to the first positioning frame and can be vertically raised and lowered relative to the first positioning frame by rotation. The top end of the support rod is connected to or abuts against the bottom end of the transmission rod, and the support rod can slide vertically to the second positioning frame. The casters are located at the bottom of the support rod. Workers can rotate the transmission rod to raise or lower it vertically along the first positioning frame, thereby transmitting force to the support rod connected to or abutting against the bottom of the transmission rod. This causes the support rod to slide up or down along the second positioning frame, thus raising or lowering the casters located at the bottom of the support rod. When the casters are needed, they can be lowered; when not needed, they can be raised and retracted, improving the service life of the casters. This application separates the transmission rod and the support rod. The support rod can extend and slide up and down to transmit the stroke of the transmission rod, thereby converting the lifting distance caused by rotating the transmission rod into the stroke of the support rod sliding up and down. This eliminates the need to make the transmission rod too long, reduces the risk of bending of the transmission rod, and improves the service life of the transmission rod.

[0029] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0030] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the specification, serve to explain the principles of this application.

[0031] Figure 1 This is a schematic diagram of the composition of a support wheel structure provided in an embodiment of this application.

[0032] Figure 2 This is an exploded structural diagram of a support wheel structure provided in an embodiment of this application.

[0033] Figure 3 This is a structural diagram of a box provided in an embodiment of this application, showing the door in a closed frame state.

[0034] Figure 4 This is a structural diagram of a box provided in an embodiment of this application, showing the door in the open frame state.

[0035] The reference numerals in the attached drawings are explained as follows: 1-Support wheel structure, 11-First positioning frame, 111-Mounting plate, 1111-Screw hole, 12-Transmission rod, 121-Handle, 1211-Seat plate, 1212-Handle, 13-Second positioning frame, 131-Upper fixing plate, 1311-Upper guide hole, 132-Lower fixing plate, 1321-Lower guide hole, 14-Support rod, 141-Plug, 142-Busset, 15-Cast wheel, 16-Reset component, 161-Compression spring, 162-Baffle, 17-Limiting structure, 171-Pin, 2-Box structure, 21-Door frame, 3-Opening and closing door. Detailed Implementation

[0036] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that the description of this application will be more complete and fully convey the concept of the exemplary embodiments to those skilled in the art.

[0037] In the description of this utility model, all the connection relationships mentioned do not refer to direct connection of components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this utility model can be combined interactively without contradicting each other.

[0038] In the description of this utility model, unless otherwise explicitly defined, terms such as setting, installing, and connecting should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0039] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than", "less than", "exceeding" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself.

[0041] This application provides a support wheel structure 1, which enables the caster 15 to be raised and lowered, thereby improving the service life of the caster 15.

[0042] The support wheel structure 1 includes a first positioning frame 11, a second positioning frame 13, a transmission rod 12, a support rod 14, and a caster 15. The first positioning frame 11 and the second positioning frame 13 are vertically spaced apart. The transmission rod 12 extends vertically and is threadedly connected to the first positioning frame 11. The transmission rod 12 can rotate relative to the first positioning frame 11, allowing it to rise and fall vertically relative to the first positioning frame 11. The support rod 14 extends vertically and is slidably connected to the second positioning frame 13. The support rod 14 is located at the bottom of the transmission rod 12. The top end of the support rod 14 connects to or abuts against the bottom end of the transmission rod 12. The caster 15 is located at the bottom of the support rod 14 and can rise and fall with the movement of the transmission rod 12.

[0043] Workers can rotate the transmission rod 12, causing it to rise or fall vertically along the first positioning frame 11. This transmits force to the support rod 14 connected to or abutting the bottom of the transmission rod 12, causing the support rod 14 to slide up or down along the second positioning frame 13. This allows the casters 15 located at the bottom of the support rod 14 to rise or fall. When the casters 15 are needed, they can be lowered; when not needed, they can be raised, extending their service life. This application separates the transmission rod 12 and the support rod 14. The support rod 14 has an extension function and can slide up and down to transmit the stroke of the transmission rod 12. This converts the lifting distance caused by rotating the transmission rod 12 into the stroke of the support rod 14 sliding up and down. This eliminates the need for an excessively long transmission rod 12, reducing the risk of bending and extending its service life.

[0044] Figure 1 A schematic diagram of the support wheel structure 1 is shown. Figure 2 An exploded view of the support wheel structure 1 is shown. For ease of description, the vertical direction in the following text refers to the up-down direction shown in the figure.

[0045] like Figure 1 As shown, the support wheel structure 1 includes a first positioning frame 11 and a second positioning frame 13 arranged vertically in sequence. The first positioning frame 11 is located above the second positioning frame 13. A transmission rod 12 is threadedly connected to the first positioning frame 11, and a support rod 14 is slidably connected to the second positioning frame 13 vertically, that is, the transmission rod 12 is located above the support rod 14, and the bottom end of the transmission rod 12 is connected to or abuts against the top end of the support rod 14. The first positioning frame 11 and the second positioning frame 13 can be used to install on the switch door 3, thereby positioning and supporting the transmission rod 12 and the support rod 14 on the switch door 3.

[0046] like Figure 2As shown, in this embodiment, the first positioning frame 11 includes a mounting plate 111, which is used to mount on the switch door 3. The mounting plate 111 has a screw hole 1111 that connects to the transmission rod 12. Specifically, the screw hole 1111 extends through the mounting plate 111 in the vertical direction, and the transmission rod 12 is threaded into the screw hole 1111. By rotating the transmission rod 12, the transmission rod 12 can move up and down relative to the mounting plate 111. Furthermore, the mounting plate 111 and the second positioning frame 13 are spaced apart to facilitate the installation of the transmission rod 12 and the support rod 14.

[0047] In addition, the first positioning frame 11 can also be other structures, such as a frame, a cylinder, or at least two mounting plates 111 spaced apart from top to bottom, as long as the first positioning frame 11 has a screw hole 1111 for the transmission rod 12 to pass through or is fixed with a nut that can cooperate with the transmission rod 12.

[0048] In this embodiment, the transmission rod 12 has a vertically extending rod-like structure and is threaded on its outer periphery. Specifically, the transmission rod 12 can be a screw or a lead screw. In other embodiments, the transmission rod 12 may also have a threaded groove structure on its outer periphery.

[0049] Furthermore, a handle 121 is provided at the end of the transmission rod 12 away from the support rod 14. The handle 121 is located at the top of the transmission rod 12, making it easy for the operator to rotate the transmission rod 12, reducing interference, and making it convenient and labor-saving.

[0050] In this embodiment, the handle 121 includes a base plate 1211 and a handle 1212. The transmission rod 12 and the handle 121 are respectively connected to the two vertical sides of the base plate 1211. The handle 1212 extends vertically, and the axis of the transmission rod 12 is vertically offset from the axis of the handle 1212. Specifically, the handle 1212 and the transmission rod 12 are respectively located on the horizontally opposite sides of the handle 121, and the handle 1212 and the transmission rod 12 are respectively located on the upper and lower sides of the base plate 1211. The handle 1212 is located on the top surface of the base plate 1211, and the transmission rod 12 is connected to the bottom surface of the base plate 1211. By shaking the handle 1212, the base plate 1211 is pushed to drive the transmission rod 12 to rotate, thereby adjusting the vertical position of the transmission rod 12. Furthermore, the handle 1212 is fixedly connected to the transmission rod 12 through the base plate 1211, extending the power arm of the handle 1212, which saves effort and makes it convenient for workers to use.

[0051] The transmission rod 12 and the handle 1212 can be connected to the base plate 1211 by fixed connection methods such as welding and gluing, or by detachable connection methods such as threaded connection.

[0052] In addition, the handle 121 can also be set on the top side wall of the transmission rod 12 and extended horizontally to facilitate operation by the staff.

[0053] In this embodiment, the second positioning frame 13 is spaced apart from the first positioning frame 11. The second positioning frame 13 includes an upper fixing plate 131 and a lower fixing plate 132 spaced apart vertically. The upper fixing plate 131 and the lower fixing plate 132 are used to mount on the switch door 3. The upper fixing plate 131 is provided with an upper guide hole 1311, and the lower fixing plate 132 is provided with a lower guide hole 1321. One axial end of the support rod 14 extends upward through the upper guide hole 1311 and is connected to the transmission rod 12. The other axial end of the support rod 14 extends downward through the lower guide hole 1321 and is connected to the caster 15. The support rod 14 can slide up and down relative to the upper guide hole 1311 and the lower guide hole 1321.

[0054] Specifically, the upper guide hole 1311 is vertically through the upper fixed plate 131, and the lower guide hole 1321 is vertically through the lower fixed plate 132. The axes of the upper guide hole 1311 and the lower guide hole 1321 coincide, forming a sliding channel for installing the support rod 14. The upper fixed plate 131 and the lower fixed plate 132 are spaced vertically, so that the upper guide hole 1311 and the lower guide hole 1321 provide two positioning points for the support rod 14 in the axial direction. The support rod 14 can slide up and down along the upper guide hole 1311 and the lower guide hole 1321, improving the stability of the support rod 14 and reducing the shaking during the sliding process. In fact, the inner diameter of the upper guide hole 1311 and the lower guide hole 1321 is slightly larger than that of the support rod 14, so that the support rod 14 can pass through the upper guide hole 1311 and the lower guide hole 1321 and slide smoothly within them.

[0055] In other embodiments, the second positioning frame 13 may also take other forms, such as a sleeve, a frame, a single fixing plate, or three or more fixing plates arranged at intervals between the upper and lower parts, as long as the second positioning frame 13 has a sliding channel that runs through it from top to bottom for the support rod 14 to pass through.

[0056] In this embodiment, the support rod 14 is a rod-shaped structure that extends vertically. The top end of the support rod 14 is connected to or abuts against the bottom end of the transmission rod 12. By rotating the transmission rod 12, the vertical sliding position of the support rod 14 along the second positioning frame 13 can be adjusted, thereby realizing the lifting and lowering of the caster 15.

[0057] Specifically, the support rod 14 is hollow inside, meaning it has a through hole running vertically through it. This reduces the weight of the support rod 14 and makes it easier for workers to rotate it via the transmission rod 12. Alternatively, the support rod 14 can be a solid structure if weight is not a concern.

[0058] Furthermore, a bushing 142 is fitted inside the bottom of the support rod 14, and the caster 15 is threaded into the bushing 142. The bushing 142 provides an installation position for the caster 15, which is detachably connected to the support rod 14, facilitating the overall assembly and disassembly of the support wheel structure 1. The caster 15 in this application can be a swivel wheel for easy opening and closing of the door 3.

[0059] Furthermore, the top of the inner end of the strut 14 is sealed with a plug 141, and the transmission rod 12 abuts against the plug 141. The plug 141 can cover the top opening of the strut 14, and the transmission rod 12 transmits force to the strut 14 through the plug 141, increasing the contact area with the transmission rod 12, preventing misalignment of the transmission rod 12, and improving the stability of stroke transmission.

[0060] Furthermore, the axial extension direction of the support rod 14 coincides with the axial extension direction of the transmission rod 12, ensuring that the transmission rod 12 can accurately act on the support rod 14, thus improving structural reliability. In actual installation, the axes of the transmission rod 12 and the support rod 14 can be slightly offset, as long as the transmission rod 12 can connect or abut against the support rod 14.

[0061] Furthermore, the support wheel structure 1 also includes a reset member 16. The reset member 16 is connected between the second positioning frame 13 and the support rod 14, and is configured to provide an upward force to the support rod 14 so that the top end of the support rod 14 remains in contact with the bottom end of the transmission rod 12.

[0062] The bottom end of the transmission rod 12 abuts against the top end of the support rod 14. The reset member 16 can store and release energy through the elastic deformation of the material, so that the support rod 14 always abuts against the bottom end of the transmission rod 12, maintaining the continuous fit between the transmission rod 12 and the support rod 14 in the axial length, which facilitates the transmission rod 12 to transmit its stroke to the support rod 14 by rotating relative to the first positioning frame 11.

[0063] Furthermore, a limiting structure 17 protrudes outward from the outer periphery of the support rod 14. The limiting structure 17 is spaced above the second positioning frame 13, and the reset member 16 is located between the limiting structure 17 and the second positioning frame 13. Specifically, the top end of the reset member 16 contacts the limiting structure 17, and the bottom end of the reset member 16 contacts the second positioning frame 13. By providing a connecting position for the reset member 16 through the limiting structure 17 protruding from the outer periphery of the support rod 14, the connection of the reset member 16 is facilitated.

[0064] In fact, the limiting structure 17 is located between the upper fixing plate 131 and the lower fixing plate 132, and the limiting structure 17 and the lower fixing plate 132 are spaced apart. The reset member 16 is connected between the limiting structure 17 and the lower fixing plate 132.

[0065] Specifically, the reset component 16 of this application includes a compression spring 161. The top end of the compression spring 161 abuts against the limiting structure 17, and the bottom end of the compression spring 161 abuts against the top surface of the lower fixed plate 132. The compression spring 161 is in a compressed state, continuously providing an upward reset force to the limiting structure 17, thereby ensuring that the support rod 14 always abuts against the bottom end of the transmission rod 12. The support rod 14 can slide up and down as the position of the transmission rod 12 is adjusted to achieve lifting and lowering. In other embodiments, the limiting structure 17 on the support rod 14 may be positioned above the upper fixed plate 131, with the top end of the compression spring 161 abutting against the limiting structure 17 and the bottom end of the compression spring 161 abutting against the top surface of the upper fixed plate 131.

[0066] In some other embodiments, the reset member 16 can also be a tension spring. In this case, the limiting structure 17 is spaced below the second positioning frame 13. The top end of the tension spring is connected to the second positioning frame 13, and the bottom end of the tension spring is connected to the limiting structure 17. The tension spring is in a stretched state and has a tendency to continuously pull the limiting structure 17 upward, thereby ensuring that the support rod 14 always abuts against the bottom end of the transmission rod 12. In a specific embodiment, the limiting structure 17 can be spaced between the upper fixed plate 131, with the top end of the upper tension spring connected to the upper fixed plate 131 and the bottom end connected to the limiting structure 17. Alternatively, the limiting structure 17 can be spaced between the upper fixed plate 131 and the lower fixed plate 132, with the top end of the tension spring connected to the lower fixed plate 132 and the bottom end connected to the limiting structure 17.

[0067] In addition, the reset element 16 can also be other elastic elements, such as rubber, rubber band, gas spring, bellows, etc. The reset element 16 can also use a magnetic attraction structure to provide a vertical magnetic attraction or repulsion force to achieve the abutment between the support rod 14 and the transmission rod 12.

[0068] Furthermore, the reset member 16 is sleeved on the outer periphery of the support rod 14. This improves the stability of the reset member 16 during force transmission. Specifically, in this embodiment, the compression spring 161 is sleeved on the outer periphery of the support rod 14 to prevent misalignment and deformation of the compression spring 161, thereby improving its stability and reducing space occupation.

[0069] It should be noted that the limiting structure 17 can be a ring structure arranged around the outer peripheral wall of the support rod 14, specifically a limiting step or a limiting ring sleeved and fixed to the outer peripheral wall of the support rod 14. Alternatively, the limiting structure 17 can be a protruding structure on the side wall of the support rod 14, specifically a protrusion or a protruding strip on the side wall of the support rod 14.

[0070] In this embodiment, the reset member 16 further includes a baffle 162, which is connected to the top end of the compression spring 161. The baffle 162 connects to the top end of the compression spring 161, increasing the contact area between the reset member 16 and the limiting structure 17 and improving the installation stability of the reset member 16. The top end of the compression spring 161 may be welded to the baffle 162.

[0071] The limiting structure 17 includes a pin 171, which is detachably mounted on the support rod 14. At least one end of the pin 171 extends axially from the outer wall of the support rod 14 and is abutted by the reset member 16. The pin 171 is detachably mounted on the support rod 14. After the reset member 16 is placed in the corresponding position, the reset member 16 can be installed by passing the pin 171 through it. Furthermore, the reset member 16 can be disassembled by removing the pin 171 from the support rod 14, facilitating the installation and removal of the reset member 16 and aiding in maintenance and replacement.

[0072] In this application, the compression spring 161 is abutted against the pin 171 at the position protruding from the support rod 14 by the baffle 162. This not only improves the connection reliability of the compression spring 161 and prevents the top of the compression spring 161 from coming out of the limiting structure 17, but also prevents the pin 171 from getting stuck in the spring opening by the baffle 162 abutting between the compression spring 161 and the pin 171.

[0073] In this embodiment, the two axial ends of the pin 171 protrude through the radially opposite side walls of the support rod 14, further improving the installation stability of the reset member 16. Alternatively, only one axial end of the pin 171 may protrude through the outer wall of the support rod 14.

[0074] In addition, in some other embodiments, the compression spring 161 may directly abut against the limiting structure 17.

[0075] The separate design of the transmission rod 12 and the support rod 14 in this embodiment facilitates disassembly, maintenance, and replacement. In other embodiments, the bottom end of the transmission rod 12 and the top end of the support rod 14 can be connected by bearings, bushings 142, or spacers to prevent the transmission rod 12 from driving the support rod 14 to rotate, while allowing the vertical sliding distance of the support rod 14 to be controlled by the engagement position of the transmission rod 12 relative to the first positioning frame 11, thereby ensuring that rotating the transmission rod 12 can drive the support rod 14 to rise and fall.

[0076] Figure 3 , Figure 4 A structural diagram of the box is shown.

[0077] Reference Figure 3 and Figure 4This application also discloses a box, which includes a box structure 2, a switch door 3, and the aforementioned support wheel structure 1. The box structure 2 has a receiving space, and the side wall of the box structure 2 has an opening communicating with the receiving space to form a door frame 21. One side of the switch door 3 is hinged to the door frame 21 and can be used to open or close the door frame 21. The support wheel structure 1 is disposed on the switch door 3. Specifically, the first positioning frame 11 and the second positioning frame 13 of the support wheel structure 1 are arranged vertically in sequence on the switch door 3. The caster 15 is located at the bottom of the switch door 3 and can be used to roll on the ground when the switch door 3 opens or closes the door frame 21. After the switch door 3 closes the door frame 21, the support rod 14 can be raised by rotating the transmission rod 12, so that the caster 15 is raised with the transmission rod 12 and leaves the ground.

[0078] In order to further achieve smooth opening and closing of the switch door 3, the hinge position of the switch door 3 and the housing structure 2 and the setting position of the support wheel structure 1 are respectively located on opposite sides of the switch door 3, thereby improving the support effect of the caster 15 on the switch door 3.

[0079] In actual use, the support wheel structure 1 is set on the side of the switch door 3 facing away from the door frame 21, so that the first positioning frame 11 and the second positioning frame 13 are on the outside of the switch door 3. Specifically, the mounting plate 111, the upper fixing plate 131, and the lower fixing plate 132 can all be fixed to the switch door 3 by welding, and the screw holes 1111, the upper guide hole 1311, and the lower guide hole 1321 on the mounting plate 111 are all aligned vertically. Furthermore, when in use, the caster 15 can be flush with the bottom of the housing structure 2.

[0080] The support wheel structure of this application allows for adjustment of the position of the lifting caster 15 supporting the ground, thus facilitating the adjustment of the height of the opening and closing door 3. Furthermore, only one worker needs to rotate the transmission rod 12 to adjust the height of the caster 15, saving manpower and eliminating the need for additional auxiliary tools or equipment.

[0081] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the appended claims.

Claims

1. A support wheel structure, characterized in that, include: The first positioning frame and the second positioning frame are arranged vertically in sequence; A transmission rod extends vertically and is threadedly connected to the first positioning frame. The transmission rod is rotatable relative to the first positioning frame so that it can move vertically up and down relative to the first positioning frame. A strut extends vertically and is slidably connected to the second positioning frame, the top end of the strut being connected to or abutting against the bottom end of the transmission rod; Casters are located at the bottom of the support rod; The casters are able to rise and fall with the movement of the transmission rod.

2. The support wheel structure according to claim 1, characterized in that, Also includes: A reset element, connected between the second positioning frame and the support rod, is configured to provide an upward force to the support rod so that the top end of the support rod remains in contact with the bottom end of the transmission rod.

3. The support wheel structure according to claim 2, characterized in that, The outer periphery of the support rod is provided with a limiting structure, which is spaced above the second positioning frame, and the reset member is located between the limiting structure and the second positioning frame; The reset component is sleeved on the outer periphery of the support rod; The reset element includes a compression spring.

4. The support wheel structure according to claim 3, characterized in that, The reset element further includes a baffle plate connected to the top end of the compression spring; and / or The limiting structure includes a pin that is detachably mounted on the support rod. At least one end of the pin extends axially from the outer wall of the support rod and is abutted by the reset member.

5. The support wheel structure according to claim 1, characterized in that, The axial length of the transmission rod is less than the axial length of the support rod; and / or The axial extension direction of the transmission rod coincides with the axial extension direction of the support rod.

6. The support wheel structure according to claim 2, characterized in that, The support rod is hollow inside; The inner bottom end of the support rod is fitted with a bushing, and the caster is threadedly connected to the bushing; The top of the inner end of the support rod is sealed with a plug, and the transmission rod abuts against the plug.

7. The support wheel structure according to claim 1 or 2, characterized in that, The second positioning frame includes an upper fixing plate and a lower fixing plate spaced apart vertically. The upper fixing plate and the lower fixing plate are used to be mounted on the door. The upper fixing plate is provided with an upper guide hole, and the lower fixing plate is provided with a lower guide hole. One axial end of the support rod extends upward through the upper guide hole and is connected to or abuts against the transmission rod. The other axial end of the support rod extends downward through the lower guide hole and is connected to the caster. The support rod can slide up and down relative to the upper guide hole and the lower guide hole.

8. The support wheel structure according to claim 1, characterized in that, The first positioning frame includes a mounting plate spaced apart from the second positioning frame. The mounting plate is used to be mounted on the door and has screw holes that cooperate with the transmission rod.

9. The support wheel structure according to claim 1, characterized in that, The transmission rod is provided with a handle at the end away from the support rod; The handle includes a base plate and a handle. The transmission rod and the handle are respectively connected to the two sides of the base plate along the vertical direction. The axis of the transmission rod and the axis of the handle are offset vertically.

10. A box, characterized in that, include: The box-like structure forms a door frame; A door hinged to the door frame and used to open or close the door frame; At least one support wheel structure as described in any one of claims 1 to 9, wherein the first positioning frame and the second positioning frame are sequentially arranged vertically on the switch door, and the caster is located at the bottom of the switch door.

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