Grass turning machine

Abstract

The utility model provides a grass turning machine, relates to agricultural machinery technical field, the grass turning machine includes support mechanism, grass turning mechanism and swing angle adjustment mechanism, the grass turning mechanism includes swing arm and grass turning wheel, the swing arm is rotatablely arranged on the support mechanism along the horizontal plane, and the swing arm is rotatably arranged on the support mechanism along the horizontal plane. The grass turning wheel is rotatably arranged on the swinging arm along a vertical surface; the swing angle adjusting mechanism comprises a telescopic rod assembly, the first end of the telescopic rod assembly is rotationally connected with the swing arm, the second end of the telescopic rod assembly is rotationally connected with the supporting mechanism, and the telescopic rod assembly stretches out and draws back in the axial direction and can adjust the swing angle of the swing arm relative to the supporting mechanism. Through mutual cooperation of the swing arm and the swing angle adjusting mechanism, the horizontal swing angle of the grass turning wheel can be adjusted according to actual requirements, so that the effects of tedding, raking and the like are effectively guaranteed, the structure is flexible, and the application range is wide.

Description

Technical Field

[0001] The utility model relates to the technical field of agricultural machinery, and particularly relates to a hayturner. Background Art

[0002] A hayturner is an agricultural machinery device mainly used for processing crop straws, forages, etc. Through the methods of turning and combing, functions such as turning and drying, raking, and spreading of the straws are realized. The hayturner can be used behind a traction device such as a tractor or can operate independently, and is applicable to various environments and crops, such as corn straws, rice straws, forages, etc.

[0003] Existing hayturners usually are provided with a hayturning wheel, and hayturning teeth are arranged on the hayturning wheel. As the hayturner moves forward, the hayturning wheel rotates to realize functions such as turning and drying, raking, and spreading. However, the existing hayturning wheel cannot adjust the swinging angle in the horizontal direction, and the structure is not flexible enough, affecting its working effect. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a hayturner to solve the above-mentioned technical problems existing in the prior art; the preferred technical solutions provided by the utility model can produce many technical effects; see the following for details.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A hayturner provided by the utility model includes a support mechanism, a hayturning mechanism, and a swing angle adjustment mechanism, wherein: the hayturning mechanism includes a swing arm and a hayturning wheel. The swing arm is rotatably arranged on the support mechanism along the horizontal plane, and the hayturning wheel is rotatably arranged on the swing arm along the vertical plane; the swing angle adjustment mechanism includes a telescopic rod assembly. The first end of the telescopic rod assembly is rotatably connected to the swing arm, the second end of the telescopic rod assembly is rotatably connected to the support mechanism, and the telescopic rod assembly expands and contracts along the axial direction to adjust the swing angle of the swing arm relative to the support mechanism.

[0007] Preferably, the telescopic rod assembly includes a threaded shaft sleeve and a threaded connecting piece, wherein: internal threads that are threadedly matched with the threaded connecting piece are arranged on the inner walls of both ends of the threaded shaft sleeve; the number of the threaded connecting pieces is set to two, and the two threaded connecting pieces are respectively threadedly connected to both ends of the threaded shaft sleeve; by rotating the threaded shaft sleeve, the threaded connecting piece can expand and contract along the axial direction relative to the threaded shaft sleeve.

[0008] Preferably, the threaded connector includes a hinge member and a stud integrally provided, and the telescopic rod assembly further includes two locking nuts, wherein: the hinge member is rotatably connected to the swing arm or the support mechanism; the stud is inserted into the threaded sleeve along the port of the threaded sleeve and is threadedly connected to the threaded sleeve; the locking nut is threadedly connected to the corresponding stud for locking the position of the threaded connector relative to the threaded sleeve.

[0009] Preferably, the support mechanism includes a support arm, a fixed arm and a shock absorber, wherein: the swing arm is rotatably arranged on the support arm along the horizontal plane, and the second end of the telescopic rod assembly is rotatably connected to the support arm; the support arm is rotatably arranged on the fixed arm along the vertical plane; both ends of the shock absorber are rotatably connected to the fixed arm and the support arm respectively.

[0010] Preferably, the hay turning wheel includes a wheel body, and the wheel body is rotatably arranged on the swing arm along the vertical plane; a plurality of hay turning tooth rods are uniformly arranged on the wheel body along the circumferential direction.

[0011] Preferably, the hay turner includes a movable towing frame, and the support mechanism is arranged on the movable towing frame; the movable towing frame is used for connecting a towing device.

[0012] Preferably, the support mechanism is rotatably arranged on the movable towing frame along the vertical plane; the hay turner includes an inclination adjusting mechanism, the inclination adjusting mechanism is arranged on the movable towing frame and is connected to the support mechanism, and the inclination adjusting mechanism can adjust the inclination of the support mechanism relative to the movable towing frame.

[0013] Preferably, the support mechanism includes a connecting beam, the movable towing frame is provided with a horizontal support frame, and the connecting beam is rotatably arranged on the horizontal support frame along the vertical plane through a rotating assembly; the rotating assembly includes a fixed sleeve plate, a clamping plate and a movable sleeve plate, wherein the fixed sleeve plate is fixedly connected to the horizontal support frame, the two clamping plates are clamped at both ends of the fixed sleeve plate and enclose an installation cavity with the fixed sleeve plate, the movable sleeve plate is rotatably arranged in the installation cavity, the movable sleeve plate is fixedly sleeved on the connecting beam and rotates synchronously with the connecting beam.

[0014] Preferably, the inclination adjusting mechanism includes a hand-operated self-locking winch, a towing cable, a movable pulley and a fixed pulley, wherein: the hand-operated self-locking winch is arranged on the movable towing frame; the movable pulley is arranged on the support mechanism; the fixed pulley is arranged on the movable towing frame; one end of the towing cable is connected to the hand-operated self-locking winch, and the other end of the towing cable sequentially bypasses the movable pulley and the fixed pulley and is fixedly connected to the movable towing frame.

[0015] Preferably, the movable towing frame includes a horizontal fixing rod, a wheel bracket, wheels and a locking assembly, wherein: the wheel bracket is slidably arranged on the horizontal fixing rod; the wheels are rotatably arranged on the wheel bracket; the locking assembly is arranged on the wheel bracket and can lock the position of the wheel bracket relative to the horizontal fixing rod.

[0016] The hay tedding machine provided by the utility model has at least the following beneficial effects:

[0017] The hay tedding machine includes a support mechanism, a hay tedding mechanism and a swing angle adjustment mechanism. The support mechanism can stably support the hay tedding mechanism, the swing angle adjustment mechanism, etc. The hay tedding mechanism is an actuator for functions such as hay tedding and raking. The swing angle adjustment mechanism can adjust the swing angle of the hay tedding mechanism according to actual needs.

[0018] The hay tedding mechanism includes a swing arm and a hay tedding wheel. The swing arm is rotatably arranged on the support mechanism along the horizontal plane. The hay tedding wheel is rotatably arranged on the swing arm along the vertical plane. The swing adjustment mechanism includes a telescopic rod assembly. The first end of the telescopic rod assembly is rotatably connected to the swing arm. The second end of the telescopic rod assembly is rotatably connected to the support mechanism. When adjusting the swing angle of the hay tedding wheel, the telescopic rod assembly is telescoped along the axial direction so as to adjust it to a specified axial length. During this process, the telescopic rod assembly drives the swing arm to swing relative to the support mechanism, so as to adjust it to a specified swing angle.

[0019] Through the mutual cooperation of the swing arm and the swing angle adjustment mechanism, the utility model can adjust the horizontal swing angle of the hay tedding wheel according to actual needs, thereby effectively ensuring the effects of hay tedding, raking, etc. It not only has a flexible structure, but also has a wide range of applications. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 is a structural schematic diagram of the present utility model;

[0022] Figure 2 is a structural schematic diagram of the hay tedding mechanism and the swing angle adjustment mechanism of the present utility model;

[0023] Figure 3 is a structural schematic diagram of the telescopic rod assembly of the present utility model;

[0024] Figure 4 is a schematic structural diagram of the movable towing rack and the inclination angle adjusting mechanism (excluding the towing cable) of the present utility model;

[0025] Figure 5 is a schematic structural diagram of the movable towing rack and the inclination angle adjusting mechanism (excluding the towing cable) of the present utility model;

[0026] Figure 6 is Figure 4 an enlarged view of part A of

[0027] Figure 7 is a schematic structural diagram of the rotating assembly of the present utility model.

[0028] Reference numerals

[0029] 1, support mechanism; 11, support arm; 12, fixed arm; 13, shock absorber; 14, connecting beam; 15, connecting arm; 2, hay turning mechanism; 21, swing arm; 22, hay turning wheel; 221, hay turning tooth bar; 222, wheel body; 3, swing angle adjusting mechanism; 31, telescopic rod assembly; 311, threaded shaft sleeve; 312, threaded connecting piece; 3121, hinge piece; 3122, stud; 313, locking nut; 4, movable towing rack; 41, horizontal fixing rod; 42, wheel bracket; 43, wheel; 44, locking assembly; 45, horizontal support frame; 46, rotating assembly; 461, fixed sleeve plate; 462, movable sleeve plate; 463, clamping plate; 5, inclination angle adjusting mechanism; 51, hand-operated self-locking winch; 52, towing cable; 53, movable pulley; 54, fixed pulley. Detailed implementation manners

[0030] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions of the present utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other implementation manners obtained by those of ordinary skill in the art without creative efforts shall fall within the scope protected by the present utility model.

[0031] Embodiment 1:

[0032] The present utility model provides a hay turning machine. Referring to Figures 1 to 6 as shown, the hay turning machine includes a support mechanism 1, a hay turning mechanism 2 and a swing angle adjusting mechanism 3.

[0033] The raking mechanism 2 includes a swing arm 21 and a raking wheel 22. The swing arm 21 is rotatably arranged on the support mechanism 1 along the horizontal plane, and the raking wheel 22 is rotatably arranged on the swing arm 21 along the vertical plane; the swing angle adjustment mechanism 3 includes a telescopic rod assembly 31. The first end of the telescopic rod assembly 31 is hinged to the swing arm 21, and the second end of the telescopic rod assembly 31 is hinged to the support mechanism 1.

[0034] During operation, the hay rake moves driven by a traction device such as a tractor, and the raking wheel 22 rotates, thereby realizing functions such as turning and raking the hay.

[0035] In the above process, the user can adjust the telescopic rod assembly 31 to make it telescopic along the axis according to actual needs and adjust it to a specified axial length. The telescopic rod assembly 31 drives the swing arm 21 to swing relative to the support mechanism 1, thereby adjusting the raking wheel 22 to a specified swing angle. In this way, the effects of turning and raking the hay can be effectively guaranteed.

[0036] Through the mutual cooperation of the swingable swing arm 21 and the swing angle adjustment mechanism 3, the present utility model can adjust the swing angle of the raking wheel 22 according to actual needs, which can not only effectively guarantee the effects of turning and raking the hay, but also has a flexible structure and a wide range of applications.

[0037] Embodiment 2:

[0038] Embodiment 2 is based on Embodiment 1:

[0039] As shown in Figures 1 to 6 , the telescopic rod assembly 31 includes a threaded shaft sleeve 311 and a threaded connector 312.

[0040] Inner threads for threaded engagement with the threaded connector 312 are provided on the inner walls of both ends of the threaded shaft sleeve 311; the number of threaded connectors 312 is set to two. The two threaded connectors 312 are respectively threadedly connected to both ends of the threaded shaft sleeve 311, and the two threaded connectors 312 are respectively connected to the support mechanism 1 and the swing arm 21.

[0041] When adjusting the swing angle, the user holds the threaded shaft sleeve 311 and rotates it. At this time, the two threaded connectors 312 synchronously retract and extend along the axis of the threaded shaft sleeve 311. During this process, the threaded connector 312 drives the swing arm 21 to swing, thereby realizing the adjustment of the swing angle.

[0042] The threaded shaft sleeve 311 and the threaded connector 312 cooperate with each other. On the one hand, axial telescoping can be achieved only by rotation, and the adjustment operation is convenient. On the other hand, it has a self-locking function, which can effectively lock the axial length and thus lock the swing angle.

[0043] As an optional implementation manner, the threaded connector 312 includes an integrally provided hinge member 3121 and a stud 3122.

[0044] The hinge member 3121 is hingedly connected to the swing arm 21 or the support mechanism 1; the stud 3122 is inserted into the threaded bushing 311 along the port of the threaded bushing 311 and is threadedly connected to the threaded bushing 311.

[0045] The integrally provided hinge member 3121 and stud 3122 are firmly connected and will not rotate radially during the process of adjusting the swing angle, which can effectively ensure the telescopic adjustment effect.

[0046] As an optional embodiment, the telescopic rod assembly 31 further includes two locking nuts 313, and the locking nuts 313 are threadedly connected to the corresponding threaded connectors 312.

[0047] After the axial length adjustment is completed, rotate the locking nut 313 to make it abut against the threaded bushing 311, further locking the relative position between the threaded bushing 311 and the stud 3122 and locking the swing angle.

[0048] As an optional embodiment, the support mechanism 1 includes a support arm 11, the swing arm 21 is rotatably arranged at the end of the support arm 11 along the horizontal plane, the second end of the telescopic rod assembly 31 is rotatably connected to the support arm 11, and the support arm 11 can firmly support the swing arm 21.

[0049] As an optional embodiment, the support mechanism 1 includes a fixed arm 12 and a shock absorber 13.

[0050] The support arm 11 is rotatably arranged on the fixed arm 12 along the vertical plane; both ends of the shock absorber 13 are hingedly connected to the fixed arm 12 and the support arm 11 respectively.

[0051] During the operation of the hayturner, the shock absorber 13 has a buffering and shock-absorbing effect, enabling the support arm 11 to swing up and down adaptively, further improving the hay turning and raking effects; the shock absorber 13 is a prior art and its internal structure will not be elaborated.

[0052] As an optional embodiment, the hay turning wheel 22 includes a wheel body 222, and the wheel body 222 is rotatably arranged on the swing arm 21 along the vertical plane; a plurality of hay turning tooth rods 221 are uniformly arranged on the wheel body 222 along the circumferential direction.

[0053] The fixed end of the hay turning tooth rod 221 is arranged on the wheel body 222 and is further fixed by U-shaped connection.

[0054] As an optional embodiment, the number of the hay turning mechanism 2, the swing angle adjusting mechanism 3, the support arm 11, the fixed arm 12 and the shock absorber 13 is set to be multiple.

[0055] As an alternative embodiment, the hay tedding machine includes a movable towing frame 4. The support mechanism 1 includes a connecting beam 14. The fixed arm 12 is installed on the connecting beam 14 through a U-shaped connecting member. The connecting beam 14 is arranged on the movable towing frame 4. The movable towing frame 4 is used to connect the towing equipment.

[0056] As an alternative embodiment, the movable towing frame 4 is provided with a horizontal support frame 45. The connecting beam 14 is rotatably arranged on the horizontal support frame 45 along a vertical plane.

[0057] The hay tedding machine includes an inclination angle adjusting mechanism 5. The inclination angle adjusting mechanism 5 is arranged on the movable towing frame 4. A connecting arm 15 is vertically arranged on the connecting beam 14. The inclination angle adjusting mechanism 5 is connected to the connecting arm 15.

[0058] During use, the user can, according to actual needs, adjust the inclination angle of the support mechanism 1 relative to the movable towing frame 4 through the inclination angle adjusting mechanism 5, further improving the working effect of the hay tedding machine, and enhancing its structural flexibility and wide applicability.

[0059] As an alternative embodiment, the connecting beam 14 is rotatably arranged on the horizontal support frame 45 along a vertical plane through a rotating assembly 46.

[0060] The rotating assembly 46 includes a fixed sleeve plate 461, a clamping plate 463 and a movable sleeve plate 462. The fixed sleeve plate 461 is fixedly connected to the horizontal support frame 45. Two clamping plates 463 are clamped at both ends of the fixed sleeve plate 461 and enclose an installation cavity with the fixed sleeve plate 461. The movable sleeve plate 462 is rotatably arranged in the installation cavity and is in sliding fit with the cavity wall of the movable cavity. The movable sleeve plate 462 is fixedly sleeved on the connecting beam 14 and rotates synchronously with the connecting beam 14.

[0061] The fixed sleeve plate 461, the movable sleeve plate 462 and the clamping plate 463 cooperate with each other. The connecting beam 14 and the horizontal support frame 45 are not only firmly connected, but also have a remarkable rotating effect, thus effectively ensuring the inclination angle adjustment effect.

[0062] As an alternative embodiment, the inclination angle adjusting mechanism 5 includes a hand-operated self-locking winch 51, a towing cable 52, a movable pulley 53 and a fixed pulley 54.

[0063] The hand-operated self-locking winch 51 is arranged on the movable towing frame 4. The movable pulley 53 is rotatably arranged on the connecting arm 15. The fixed pulley 54 is rotatably arranged on the movable towing frame 4. One end of the towing cable 52 is connected to the hand-operated self-locking winch 51. The other end of the towing cable 52 sequentially bypasses the movable pulley 53 and the fixed pulley 54 and is fixedly connected to the movable towing frame 4.

[0064] When adjusting the inclination angle, the user rotates the handle of the hand-cranked self-locking winch 51, and the traction cable 52 pulls the connecting arm 15 to swing, thereby adjusting the inclination angle of the connecting beam 14 relative to the movable traction frame 4, and further realizing the adjustment of the inclination angle of the hay turning wheel 22.

[0065] In the above process, the setting of the movable pulley 53 makes the operation more labor-saving. Preferably, the number of movable pulleys 53 is set to two, namely the upper movable pulley and the lower movable pulley. The traction cable 52 led out by the hand-cranked self-locking winch 51 successively bypasses the upper movable pulley, the fixed pulley 54 and the lower movable pulley and is connected to the movable traction frame 4; in the actual application process, the number of movable pulleys 53 is set according to requirements.

[0066] As an alternative embodiment, the movable traction frame 4 includes a horizontal fixed rod 41, a wheel bracket 42, wheels 43 and a locking assembly 44.

[0067] The wheel bracket 42 is slidably arranged on the horizontal fixed rod 41; the wheel 43 is rotatably arranged on the wheel bracket 42; the locking assembly 44 adopts a bolt, which is arranged on the wheel bracket 42; by rotating the bolt, its end can abut against the horizontal fixed rod 41, thereby locking the relative position of the wheel bracket 42 and the horizontal fixed rod 41 and realizing the adjustment of the distance between the two wheels 43.

[0068] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.

[0069] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, the meanings of "a plurality" and "several" are at least two, such as two, three, etc., unless otherwise specifically defined.

[0070] In the present application, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0071] As described above, it is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the said claims.

Claims

1. A hay tedder, characterized in that, It includes a support mechanism, a hay turning mechanism, and a swing angle adjustment mechanism, where: The hay turning mechanism includes a swing arm and a hay turning wheel. The swing arm is rotatably arranged on the support mechanism along the horizontal plane, and the hay turning wheel is rotatably arranged on the swing arm along the vertical plane; The swing angle adjustment mechanism includes a telescopic rod assembly. The first end of the telescopic rod assembly is rotatably connected to the swing arm, and the second end of the telescopic rod assembly is rotatably connected to the support mechanism. The telescopic rod assembly can be axially telescoped to adjust the swing angle of the swing arm relative to the support mechanism.

2. The hay tedder according to claim 1, characterized in that, The telescopic rod assembly includes a threaded shaft sleeve and a threaded connecting piece, where: Inner threads that are thread - mated with the threaded connecting piece are provided on the inner walls of both ends of the threaded shaft sleeve; The number of the threaded connecting pieces is set to two, and the two threaded connecting pieces are respectively thread - connected to both ends of the threaded shaft sleeve; By rotating the threaded shaft sleeve, the threaded connecting piece can axially expand and contract relative to the threaded shaft sleeve.

3. The hay tedder according to claim 2, characterized in that, The threaded connecting piece includes a hinge piece and a stud that are integrally arranged. The telescopic rod assembly also includes two locking nuts, where: The hinge piece is rotatably connected to the swing arm or the support mechanism; The stud is inserted into the threaded shaft sleeve along the port of the threaded shaft sleeve and is thread - connected to the threaded shaft sleeve; The locking nut is thread - connected to the corresponding stud for locking the position of the threaded connecting piece relative to the threaded shaft sleeve.

4. The hay tedder according to claim 3, characterized in that, The support mechanism includes a support arm, a fixed arm, and a shock absorber, where: The swing arm is rotatably arranged on the support arm along the horizontal plane, and the second end of the telescopic rod assembly is rotatably connected to the support arm; The support arm is rotatably arranged on the fixed arm along the vertical plane; Both ends of the shock absorber are respectively rotatably connected to the fixed arm and the support arm.

5. The hay tedder according to claim 1, characterized in that, The hay turning wheel includes a wheel body, and the wheel body is rotatably arranged on the swing arm along the vertical plane; A plurality of hay turning tooth rods are evenly arranged on the wheel body along the circumferential direction.

6. The hay tedder according to claim 1, characterized in that, The hay turning machine includes a movable towing frame, and the support mechanism is arranged on the movable towing frame; The movable towing frame is used to connect the towing equipment.

7. The hay tedder according to claim 6, wherein, The support mechanism is rotatably arranged on the movable towing frame along the vertical plane; The hay turning machine includes an inclination angle adjustment mechanism. The inclination angle adjustment mechanism is arranged on the movable towing frame and is connected to the support mechanism. The inclination angle adjustment mechanism can adjust the inclination angle of the support mechanism relative to the movable towing frame.

8. The hay tedder according to claim 7, wherein The support mechanism includes a connecting beam. The movable towing frame is provided with a horizontal support frame, and the connecting beam is rotatably arranged on the horizontal support frame along the vertical plane through a rotating component; The rotating component includes a fixed sleeve plate, a clamping plate, and a movable sleeve plate. Among them, the fixed sleeve plate is fixedly connected to the horizontal support frame. The two clamping plates are clamped at both ends of the fixed sleeve plate and enclose an installation cavity with the fixed sleeve plate. The movable sleeve plate is rotatably arranged in the installation cavity. The movable sleeve plate is fixedly sleeved on the connecting beam and rotates synchronously with the connecting beam.

9. The turning machine for forage according to claim 7, characterized in that, The inclination angle adjusting mechanism includes a hand-cranked self-locking winch, a traction cable, a movable pulley and a fixed pulley, where: The hand-cranked self-locking winch is arranged on the movable traction frame; The movable pulley is arranged on the support mechanism; The fixed pulley is arranged on the movable traction frame; One end of the traction cable is connected to the hand-cranked self-locking winch, and the other end of the traction cable sequentially bypasses the movable pulley and the fixed pulley and is fixedly connected to the movable traction frame.

10. The hay tedder according to claim 7, characterized in that, The movable traction frame includes a horizontal fixed rod, a wheel bracket, wheels and a locking assembly, where: The wheel bracket is slidably arranged on the horizontal fixed rod; The wheels are rotatably arranged on the wheel bracket; The locking assembly is arranged on the wheel bracket and can lock the position of the wheel bracket relative to the horizontal fixed rod.

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