CN219382116U - Caster device and energy storage equipment - Google Patents

Abstract

The utility model relates to the technical field of energy storage equipment, and discloses a trundle device and the energy storage equipment. The caster device comprises a wheel shaft, wheels and an outer end cover, wherein the wheels are rotatably arranged at the end parts of the wheel shaft, so that the energy storage equipment can be conveniently moved when the weight of the energy storage equipment is large. The outer end cover is buckled on one side of the wheel far away from the wheel shaft, so that the wheel body is protected, and the attractiveness of the wheel is improved. The inner ring side wall of the wheel is provided with a clamping groove, the periphery of the outer end cover is provided with a buckle, and the end part of the buckle can be inserted into the clamping groove, so that the outer end cover is clamped on the wheel. The inner ring side wall of the wheel is provided with a notch penetrating through the end face of the inner ring side wall, and the notch and the clamping groove are arranged at intervals along the axial direction of the wheel, so that the notch can be opposite to the buckle. When the outer end cover is detached, an operator only needs to stretch the tool into the notch and then press the buckle inwards, so that the buckle can be moved out of the clamping groove, the outer end cover is detached from the wheel, the operation is convenient and quick, and the outer end cover and the buckle cannot be damaged.

Description

Caster device and energy storage equipment

Technical Field

The utility model relates to the technical field of energy storage equipment, in particular to a trundle device and energy storage equipment.

Background

In general, the amount of energy stored by the energy storage device is proportional to the number of batteries, and in order to ensure the service time of the energy storage device, a large number of batteries are required to keep the amount of energy stored by the energy storage device in a high range. However, an increase in the number of batteries will increase the weight of the energy storage device. To facilitate movement of the energy storage device, a castor arrangement is typically provided at the bottom thereof.

The castor device mainly comprises a wheel shaft and wheels, wherein the wheel shaft is fixed on a shell of the energy storage equipment, the wheels are rotatably arranged on the wheel shaft, and the wheels can rotate around the wheel shaft when the energy storage equipment is pulled, so that the energy storage equipment can be conveniently moved. In the prior art, in order to protect the wheel, an outer end cover is usually arranged on the outer side of the wheel and clamped in a clamping groove on the side wall of the inner ring of the wheel through a buckle, so that the outer end cover is tightly buckled on the wheel. However, when maintenance or replacement of the wheel is required, the operator can only pry the outer end cap up along the edge of the outer end cap with a tool until the outer end cap is removed and then repair or replacement of the wheel is performed. The outer end cover is extremely easy to deform or damage by the disassembling mode, or the buckle is pried off, so that the outer end cover is scrapped, and the cost is additionally increased.

Accordingly, there is a need to provide a caster device and an energy storage apparatus to solve the above-mentioned problems.

Disclosure of Invention

According to one aspect of the present utility model, the present utility model provides a caster device, which can be conveniently and rapidly disassembled without damaging the outer cover and the buckle.

In order to achieve the purpose, the utility model is realized by the following technical scheme:

a caster device comprising:

the wheel is rotationally arranged at the end part of the wheel shaft, and a clamping groove is formed in the side wall of the inner ring of the wheel;

the outer end cover is buckled on one side, far away from the wheel axle, of the wheel, a buckle is arranged on the periphery of the outer end cover, and the end part of the buckle can be inserted into the clamping groove;

the inner ring side wall of the wheel is provided with a notch penetrating through the end face of the inner ring side wall, and the notch and the clamping groove are arranged at intervals along the axial direction of the wheel, so that the notch can be opposite to the buckle.

As a preferable scheme, the number of the buckles is multiple, and the multiple buckles are arranged at intervals along the circumferential direction of the outer end cover;

the number of the clamping grooves is multiple, the clamping grooves are arranged at intervals along the circumferential direction of the wheel, the clamping grooves are arranged in one-to-one correspondence with the clamping buckles, and the notch is located on one axial side of one clamping groove.

Preferably, the outer end cover comprises a protective cover and a decorative cover, the diameter of the protective cover is smaller than that of the decorative cover, the protective cover is arranged on one side, close to the wheels, of the decorative cover, and the buckle is arranged on the circumferential edge of the decorative cover.

As a preferable scheme, one of the protective cover and the decorative cover is provided with a positioning column, the other is provided with a positioning hole, and the positioning column is in plug-in fit with the positioning hole.

As a preferable scheme, the middle position of the decorative cover is hollowed out, and the hollowed-out edge of the decorative cover protrudes to one side close to the protective cover to form an arc-shaped limiting part;

the protection cover is provided with an arc-shaped bulge, and the arc-shaped bulge is annularly arranged on the outer side of the arc-shaped limiting part and is matched with the arc-shaped limiting part.

Preferably, the wheel comprises a bearing and a wheel body, wherein an inner ring of the bearing is fixedly connected with the wheel shaft, and an outer ring of the bearing is fixedly connected with the wheel body.

Preferably, the caster device further comprises an inner end cover, the inner end cover is located at one side of the wheel away from the outer end cover and is arranged at intervals with the wheel body, and the wheel shaft penetrates through the inner end cover.

As a preferable scheme, the inner end cover comprises a cover body and a mounting part which are coaxially arranged, the mounting part is penetrated through the inner ring of the bearing, the mounting part is provided with a mounting hole penetrated along the axial direction, and the wheel axle is penetrated in the mounting hole;

the caster device further comprises a locking piece, the locking piece is arranged on the wheel shaft in a penetrating mode and then is in threaded connection with the wheel shaft, and the head of the locking piece is respectively abutted to the end face of the mounting part and the end face of the inner ring of the bearing, so that the wheel shaft, the inner end cover and the inner ring of the bearing are fixedly connected.

Preferably, a limiting piece is arranged at one end, close to the cover body, of the mounting portion along the circumferential direction of the mounting portion, and the limiting piece abuts against the end face of the inner ring of the bearing.

According to another aspect of the present utility model, the present utility model further provides an energy storage device, by providing the caster device, the movement of the energy storage device can be facilitated, and the caster device is convenient to disassemble and assemble.

In order to achieve the purpose, the utility model is realized by the following technical scheme:

the energy storage device comprises a device body and any one of the caster devices, wherein the caster devices are arranged at the bottom of the device body.

The beneficial effects of the utility model are as follows:

the utility model provides a trundle device which comprises an axle, wheels and an outer end cover, wherein the wheels are rotatably arranged at the end parts of the axle, so that energy storage equipment can be conveniently moved when the weight of the energy storage equipment is large. The outer end cover is buckled on one side of the wheel far away from the wheel shaft, so that the wheel body is protected, and the attractiveness of the wheel is improved. The inner ring side wall of the wheel is provided with a clamping groove, the periphery of the outer end cover is provided with a buckle, and the end part of the buckle can be inserted into the clamping groove, so that the outer end cover is clamped on the wheel. The inner ring side wall of the wheel is provided with a notch penetrating through the end face of the inner ring side wall, and the notch and the clamping groove are arranged at intervals along the axial direction of the wheel, so that the notch can be opposite to the buckle. When the outer end cover needs to be detached, an operator only needs to stretch the tool into the notch, then presses the buckle inwards, the buckle can be moved out of the clamping groove, the outer end cover is detached from the wheel, the operation is convenient and fast, and damage to the outer end cover and the buckle is avoided.

The utility model also provides the energy storage equipment, and by applying the caster device, the energy storage equipment can be conveniently moved when the weight of the energy storage equipment is large, and the caster device is more convenient to maintain or replace.

Drawings

For a more obvious and understandable description of embodiments of the utility model or solutions according to the prior art, reference will be made to the accompanying drawings, which are used in the description of the embodiments or the prior art and which are examples of the utility model, and from which other drawings can be obtained without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of an energy storage device according to an embodiment of the present utility model;

FIG. 2 is an exploded view of a caster device provided in an embodiment of the present utility model;

FIG. 3 is a schematic view of a wheel according to an embodiment of the present utility model;

FIG. 4 is a schematic view of a protective cover according to an embodiment of the present utility model;

FIG. 5 is a schematic view of a decorative cover according to an embodiment of the present utility model;

FIG. 6 is a schematic view of an inner end cap according to an embodiment of the present utility model;

FIG. 7 is a schematic structural view of an axle provided by an embodiment of the present utility model;

fig. 8 is a schematic structural view of a locking member according to an embodiment of the present utility model.

In the figure:

100. a castor device; 200. an equipment body;

1. a wheel axle; 11. a plane; 12. a connection hole;

2. a wheel; 21. a wheel body; 211. an inner wheel; 212. an outer wheel; 213. a clamping groove; 214. a notch; 22. a bearing;

3. an inner end cap; 31. a cover body; 32. a mounting part; 321. a mounting hole; 33. a limiting piece;

4. an outer end cap; 41. a protective cover; 411. positioning columns; 412. arc-shaped bulges; 42. a decorative cover; 421. a buckle; 422. positioning holes; 423. an arc-shaped limit part;

5. a locking member; 51. a head; 52. a stem.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

As shown in fig. 1, the present embodiment provides an energy storage device, which includes a device body 200 and a caster device 100, wherein the caster device 100 is disposed at the bottom of the device body 200. The caster device 100 can facilitate movement of the apparatus body 200.

Specifically, as shown in fig. 2, the caster device 100 provided in this embodiment includes an axle 1 and wheels 2, the wheels 2 are respectively mounted at two ends of the axle 1, the wheels 2 are rotatably disposed at the ends of the axle 1, and when in use, the wheels 2 are rotated around the axle 1 by pulling the device body 200, so that the energy storage device can be conveniently moved.

Referring to fig. 2, the wheel 2 includes a bearing 22 and a wheel body 21, wherein an inner ring of the bearing 22 is fixedly connected with the wheel axle 1, and an outer ring of the bearing 22 is fixedly connected with the wheel body 21, so that the wheel body 21 can rotate around the wheel axle 1, and movement of the device body 200 is facilitated. Alternatively, the outer ring of the bearing 22 and the wheel body 21 are integrally formed by casting at the time of processing. Of course, the bearing 22 and the wheel 21 may be manufactured separately and then assembled together.

Specifically, as shown in fig. 3, the wheel body 21 includes an inner wheel 211 and an outer wheel 212, the outer wheel 212 is fitted over the outer ring of the inner wheel 211, the inner wheel 211 is made of hard material as a skeleton, and the outer wheel 212 is made of elastic material. It will be appreciated that the inner wheel 211, which is made of a hard material, gives the wheel 2 a better load-bearing capacity, and the outer wheel 212, which is made of an elastic material, gives the wheel 2 a better shock-absorbing capacity. Illustratively, the inner wheel 211 and the outer wheel 212 may be integrally formed by two-shot molding.

Further, as shown in fig. 2, 3 and 5, the caster device 100 provided in the present embodiment further includes an outer end cover 4, and the outer end cover 4 is located on one side of the wheel 2 away from the wheel axle 1 and is fastened to the inner wheel 211, so as to protect the wheel 2 and improve the aesthetic property of the wheel 2. Specifically, the inner ring side wall of the wheel 2 is provided with a clamping groove 213, that is, the inner side wall of the inner ring 211 is provided with a clamping groove 213, the periphery of the outer end cover 4 is provided with a buckle 421, the buckle 421 is a hook-type cantilever buckle, and the end part of the buckle 421 can be inserted into the clamping groove 213, so that the outer end cover 4 is tightly connected to the wheel body 21 and can rotate along with the wheel 2.

Further, as shown in fig. 2, 3 and 5, in order to facilitate the disassembly of the outer end cover 4, a notch 214 penetrating the end face of the inner wheel 211 is formed on the inner wall of the inner wheel 211, and the notch 214 and the slot 213 are disposed at intervals along the axial direction of the wheel 2, so that the notch 214 can be opposite to the buckle 421. When the outer end cover 4 needs to be disassembled, an operator only needs to extend the tool into the notch 214 and then press the buckle 421 inwards, so that the end part of the buckle 421 can be removed from the clamping groove 213. At this time, the outer cover 4 is disconnected from the inner wheel 211, and then the outer cover 4 is detached from the wheel 2, so as to facilitate daily maintenance or replacement of the wheel 2, such as cleaning dust accumulated in the wheel 2 due to regular use, repairing the wheel 2, etc. The operation is convenient and quick, and no damage is caused to the outer end cover 4 and the buckle 421.

Preferably, the number of the buckles 421 is multiple, the multiple buckles 421 are arranged along the circumferential edge of the outer end cover 4 at intervals, the number of the clamping grooves 213 is multiple, the multiple clamping grooves 213 are arranged along the circumferential edge of the inner wheel 211 at intervals, and the multiple clamping grooves 213 are arranged in one-to-one correspondence with the multiple buckles 421, so that the connection stability of the outer end cover 4 and the outer wheel 212 is improved. When the outer end cover 4 is detached, the buckle 421 is moved out of the clamping groove 213 through the notch 214, so that one side of the outer end cover 4 is disconnected from the inner wheel 211, and then other buckles 421 can be moved out of the corresponding clamping grooves 213 during the process of detaching the outer end cover 4.

Illustratively, in the present embodiment, the number of the buckles 421 is four, the four buckles 421 are uniformly arranged at intervals along the circumferential edge of the outer end cover 4, correspondingly, the number of the clamping grooves 213 is four, the four clamping grooves 213 are uniformly arranged at intervals along the circumferential edge of the inner wheel 211, and the four clamping grooves 213 are arranged in one-to-one correspondence with the four buckles 421, so that the stability of the connection between the outer end cover 4 and the outer wheel 212 is improved, and the notch 214 is located at one axial side of one of the clamping grooves 213. In other embodiments, the number of the buckles 421 and the slots 213 may be two, three or more, which is flexibly set according to practical requirements, and is not limited herein.

Specifically, as shown in fig. 2, the outer end cover 4 includes a protecting cover 41 and a decorating cover 42 coaxially disposed, the diameter of the protecting cover 41 is smaller than that of the decorating cover 42, the protecting cover 41 is disposed on one side of the decorating cover 42 near the wheel 2, and the buckle 421 is disposed on the circumferential edge of the decorating cover 42. The protection cover 41 is not connected with the inner wheel 211, and the protection cover 41 is matched with the decorative cover 42 and is clamped on the inner wheel 211 through a buckle 421 on the decorative cover 42. The protection cover 41 and the decoration cover 42 are round, the middle position of the decoration cover 42 is hollowed out, and after the protection cover 41 is matched with the decoration cover 42, the hollowed-out part in the middle of the decoration cover 42 can be blocked, so that the outer end cover 4 integrally forms a closed cover body structure, and a better protection effect can be achieved on the wheel 2. In practical application, the hollow in the middle of the decorative cover 42 can be processed into special shapes, and the protective cover 41 and the decorative cover 42 can be coated with different colors, so that different layering effects are formed on the outer end cover 4 visually, and the attractiveness of the wheel 2 is improved.

Further, as shown in fig. 4 and 5, one of the protective cover 41 and the decorative cover 42 is provided with a positioning column 411, and the other is provided with a positioning hole 422, and the positioning column 411 is in plug-in fit with the positioning hole 422, so that positioning between the protective cover 41 and the decorative cover 42 is realized, and installation is convenient. Meanwhile, the decorative cover 42 can form a supporting function to the protective cover 41 through the cooperation of the positioning posts 411 and the positioning holes 422.

Specifically, in the present embodiment, as shown in fig. 4, the positioning posts 411 are disposed on the protective cover 41, and as shown in fig. 5, the positioning holes 422 are disposed on the decorative cover 42. Of course, in other embodiments, the positioning posts 411 are disposed on the decorative cover 42, and the positioning holes 422 are disposed on the protective cover 41, which can achieve the above effects.

Preferably, the number of the positioning posts 411 is plural, the plurality of positioning posts 411 are spaced and uniformly arranged along the circumferential edge of the protective cover 41, the number of the positioning holes 422 is plural, the plurality of positioning holes 422 are spaced and uniformly arranged along the circumferential edge of the decorative cover 42, and the plurality of positioning posts 411 are arranged in one-to-one correspondence with the plurality of positioning holes 422, thereby improving the positioning effect and the supporting effect of the protective cover 41 and the decorative cover 42.

As shown in fig. 4 and 5, in the present embodiment, the number of the positioning posts 411 is four, the four positioning posts 411 are uniformly arranged at intervals along the circumferential edge of the protective cover 41, correspondingly, the number of the positioning holes 422 is four, the four positioning holes 422 are uniformly arranged at intervals along the circumferential edge of the decorative cover 42, and the four positioning posts 411 are arranged in one-to-one correspondence with the four positioning holes 422, thereby improving the positioning effect and the supporting effect of the protective cover 41 and the decorative cover 42. In other embodiments, the number of the positioning posts 411 and the positioning holes 422 may be two, three or more, which may be flexibly set according to actual needs, and is not specifically limited herein.

Further, with continued reference to fig. 4 and 5, the middle position of the decorative cover 42 is hollowed out, and the hollowed-out edge of the decorative cover 42 protrudes to a side close to the protective cover 41 to form an arc-shaped limiting part 423; the arc-shaped protrusion 412 is arranged on the protective cover 41 at a position close to the edge, and the arc-shaped protrusion 412 is annularly arranged on the outer side of the arc-shaped limiting part 423 and is matched with the arc-shaped limiting part 423, so that the positioning effect and the supporting effect of the protective cover 41 and the decorative cover 42 are further improved. The number of the arc-shaped protrusions 412 is four, the four arc-shaped protrusions 412 are uniformly arranged along the circumferential direction of the protective cover 41 at intervals, the arc-shaped protrusions 412 and the positioning columns 411 are alternately arranged, and the middle area of the protective cover 41 formed by surrounding the arc-shaped protrusions 412 and the positioning columns 411 can completely seal the hollow-out in the middle of the decorative cover 42.

Further, as shown in fig. 2, the caster device 100 provided in this embodiment further includes an inner end cover 3, the inner end cover 3 is located at a side of the wheel 2 away from the outer end cover 4 and is spaced from the wheel body 21, and the wheel axle 1 is disposed through the inner end cover 3 and is fixedly connected with the inner end cover 3, so that the inner end cover 3 does not rotate along with the wheel 2. The inner end cover 3 can protect the wheel body 21 and can not influence the rotation of the wheel 2.

Specifically, as shown in fig. 2 and 6, the inner end cover 3 includes a cover body 31 and an installation portion 32 coaxially arranged, the cover body 31 is disc-shaped, the cover body 31 is fastened on one side of the inner wheel 211 far away from the outer end cover 4 and is arranged at intervals with the inner wheel 211, the installation portion 32 is arranged on the inner ring of the bearing 22 in a penetrating manner, an installation hole 321 penetrating in the axial direction is arranged on the installation portion 32, and the wheel axle 1 is arranged in the installation hole 321 in a penetrating manner and is flush with the end face of the installation portion 32.

Further, as shown in fig. 2, 6, 7 and 8, the caster device 100 further includes a locker 5, the locker 5 including a stem 52 and a head 51 connected, the head 51 having a diameter larger than that of the stem 52. Preferably, the locking member 5 is in the form of a bolt, the shank 52 is a threaded portion, and the head 51 is a nut. The wheel axle 1 is provided with a connecting hole 12, the connecting hole 12 is a threaded hole, a rod 52 of the locking member 5 passes through the connecting hole 12 and is in threaded connection with the connecting hole 12, and a head 51 of the locking member 5 is respectively abutted with the end face of the mounting part 32 and the end face of the inner ring of the bearing 22 so as to compress the mounting part 32 and the bearing 22, thereby fixedly connecting the wheel axle 1, the inner end cover 3 and the inner ring of the bearing 22.

It will be appreciated that the locking member 5 is an important component of the wheel 2 and axle 1 in a coupled relationship, and that exposure of the locking member 5 to the outside is easily contacted by water, dust, etc., which may affect the function of the locking member 5, and exposure of the locking member 5 may affect the aesthetic appearance of the caster device 100. In the present embodiment, the outer end cover 4 covers the outer side of the locking member 5, so that the locking member 5 can be effectively protected, and the aesthetic property of the caster device 100 can be improved. When dismantling, dismantle outer end cover 4 back through breach 214 earlier, loosen retaining member 5 again, can accomplish whole truckle device 100 dismantlement, convenient operation is swift, and can not destroy spare part.

Preferably, as shown in fig. 6, one end of the mounting portion 32, which is close to the cover 31, is provided with a limiting member 33 along the circumferential direction thereof, the limiting member 33 is specifically a plurality of limiting teeth which are circumferentially spaced along the mounting portion 32, and the limiting member 33 abuts against the inner ring end surface of the bearing 22. Because the length of the mounting portion 32 is greater than that of the bearing 22, when the mounting portion 32 is arranged in the bearing 22 in a penetrating manner, the limiting piece 33 can limit the bearing 22, so that the end face of the mounting portion 32 is flush with the end face of the bearing 22, after locking, one side face of the inner ring of the bearing 22 is abutted with the limiting piece 33, and the other side face is abutted with the locking piece 5, so that the inner end cover 3 is fixedly connected with the inner ring of the bearing 22.

Preferably, as shown in fig. 7, the side surface of the wheel axle 1 is formed with two oppositely disposed flat surfaces 11, and the shape of the mounting hole 321 is the same as the cross-sectional shape of the wheel axle 1, so that the relative fixation of the wheel axle 1 and the inner end cap 3 can be ensured, preventing the wheel axle 1 from rotating in the mounting hole 321. Of course, the cross section of the wheel axle 1 may be other shapes, such as oval, triangle, etc., and is not particularly limited in this embodiment, as long as the wheel axle 1 is prevented from rotating in the mounting hole 321.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. A caster device, comprising:

the wheel (2) is rotatably arranged at the end part of the wheel axle (1), and a clamping groove (213) is formed in the side wall of the inner ring of the wheel (2);

the outer end cover (4) is buckled on one side, far away from the wheel axle (1), of the wheel (2), a buckle (421) is arranged on the periphery of the outer end cover (4), and the end part of the buckle (421) can be inserted into the clamping groove (213);

the inner ring side wall of the wheel (2) is provided with a notch (214) penetrating through the end face of the inner ring side wall, and the notch (214) and the clamping groove (213) are arranged at intervals along the axial direction of the wheel (2), so that the notch (214) can be opposite to the buckle (421).

2. The castor device according to claim 1, characterized in that the number of the catches (421) is plural, the plurality of catches (421) being arranged at intervals along the circumference of the outer end cap (4);

the number of the clamping grooves (213) is multiple, the clamping grooves (213) are arranged at intervals along the circumferential direction of the wheel (2), the clamping grooves (213) and the clamping buckles (421) are arranged in one-to-one correspondence, and the notch (214) is located on one axial side of one clamping groove (213).

3. The castor device according to claim 1, wherein the outer end cap (4) comprises a protective cap (41) and a decorative cap (42), the protective cap (41) having a diameter smaller than the decorative cap (42), the protective cap (41) being arranged on a side of the decorative cap (42) close to the wheel (2), the catch (421) being arranged on a circumferential edge of the decorative cap (42).

4. A castor arrangement according to claim 3, characterized in that one of the protective cover (41) and the decorative cover (42) is provided with a positioning post (411) and the other is provided with a positioning hole (422), the positioning post (411) being in a plug-in fit with the positioning hole (422).

5. A castor device according to claim 3, wherein the middle position of the decorative cover (42) is hollowed out, and the hollowed-out edge of the decorative cover (42) protrudes to a side close to the protective cover (41) to form an arc-shaped limiting part (423);

arc-shaped protrusions (412) are arranged on the protective cover (41), and the arc-shaped protrusions (412) are arranged on the outer side of the arc-shaped limiting portions (423) in a surrounding mode and are matched with the arc-shaped limiting portions (423).

6. The castor device according to claim 1, characterized in that the wheel (2) comprises a bearing (22) and a wheel body (21), the inner ring of the bearing (22) is fixedly connected to the wheel axle (1), and the outer ring of the bearing (22) is fixedly connected to the wheel body (21).

7. The castor device according to claim 6, further comprising an inner end cap (3), wherein the inner end cap (3) is located on a side of the wheel (2) remote from the outer end cap (4) and spaced from the wheel body (21), and wherein the wheel axle (1) is provided through the inner end cap (3).

8. The castor device according to claim 7, wherein the inner end cap (3) comprises a cap body (31) and a mounting portion (32) coaxially arranged, the mounting portion (32) is arranged to penetrate through an inner ring of the bearing (22), a mounting hole (321) penetrating through the mounting portion (32) along an axial direction is formed, and the wheel axle (1) is arranged to penetrate through the mounting hole (321);

the caster device further comprises a locking piece (5), the locking piece (5) is arranged on the wheel shaft (1) in a penetrating mode and then is in threaded connection with the wheel shaft (1), and the head (51) of the locking piece (5) is respectively abutted to the end face of the mounting part (32) and the end face of the inner ring of the bearing (22) so that the wheel shaft (1), the inner end cover (3) and the inner ring of the bearing (22) are fixedly connected.

9. The caster device according to claim 8, wherein one end of the mounting portion (32) near the cover body (31) is provided with a stopper (33) along a circumferential direction thereof, the stopper (33) abutting against an inner ring end face of the bearing (22).

10. Energy storage device, characterized by comprising a device body (200) and a castor arrangement according to any of claims 1-9, which castor arrangement is arranged at the bottom of the device body (200).