Trundle mechanism and household appliance

Abstract

The utility model relates to a trundle mechanism and a household appliance. The trundle mechanism comprises a shell, a mounting piece and a ball. A first mounting groove is formed in the bottom of the shell; the mounting piece is detachably connected to the first mounting groove; the mounting piece is provided with a cavity and a through hole communicated with the cavity, and the through hole is located at the bottom of the mounting piece; a limiting boss is arranged in the cavity and extends towards the bottom of the mounting part, and a containing groove is formed in the side, facing the bottom of the mounting part, of the limiting boss; the accommodating groove corresponds to the through hole; the ball movably penetrates through the through hole, so that one part of the ball is limited in the accommodating groove, and the other part of the ball is positioned outside the cavity; therefore, rotation and sliding of the trundle mechanism are not affected, and meanwhile, the ground clearance of the household appliance can be effectively reduced, so that the passing rate of the inclination rate test is increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of household appliances, in particular to a caster mechanism and a household appliance. BACKGROUND

[0002] With the continuous development of economic level, various household appliances have entered people's vision, which can effectively improve the living standard.

[0003] In daily life, in order to make the household appliance convenient to move indoors, the caster mechanism is designed on the household appliance, which becomes a better choice. The ball type caster sold on the market at present is not suitable for small household appliances (electric heater, humidifier, air purifier, electric fan, etc.), because the caster mechanism in the prior art will make the ground clearance of the household appliance too large, so that when testing whether the inclination rate is qualified, the household appliance installed with the caster mechanism will have the problem of low test pass rate due to the too high ground clearance. CONTENT OF THE INVENTION

[0004] The present application provides a caster mechanism and a household appliance to solve the problem of high ground clearance leading to easy tipping of household appliances.

[0005] In a first aspect, the present application provides a caster mechanism, comprising:

[0006] a housing, the bottom of the housing having a first mounting slot;

[0007] a mounting piece, which is detachably connected to the first mounting slot; the mounting piece has a cavity and a through hole in communication with the cavity, the through hole being located at the bottom of the mounting piece; a limiting boss is arranged in the cavity, the limiting boss extending towards the bottom of the mounting piece, and one side of the limiting boss facing the bottom of the mounting piece is provided with a receiving slot; the receiving slot is arranged corresponding to the through hole;

[0008] a ball, which is movably arranged in the through hole, so that a part of the ball is limited in the receiving slot and the other part is located outside the cavity.

[0009] Further, the ball is spherical; the groove wall of the receiving slot is arc-shaped.

[0010] And / or, the hole wall of the through hole is arc-shaped and is adapted to the outer wall surface of the ball; the center of the ball is located above the through hole; or the center of the ball coincides with the center of the through hole.

[0011] Further, the mounting piece comprises:

[0012] A first supporting assembly is arranged in the first mounting groove and is clamped with the shell; a second mounting groove is arranged on the side of the first supporting assembly away from the first mounting groove; and the limiting boss is arranged in the second mounting groove.

[0013] A second supporting assembly is inserted into the second mounting groove and is clamped with the first supporting assembly to enclose the cavity; the second supporting assembly is provided with the through hole on the side away from the first supporting assembly; and one end of the limiting boss is connected with the first supporting assembly and the other end is abutted against the second supporting assembly.

[0014] Further, a reinforcing member is arranged on the side of the limiting boss away from the accommodating groove, and the reinforcing member extends to be connected with the groove wall of the second mounting groove.

[0015] Further, the reinforcing member is provided with a plurality of clamping holes.

[0016] The second supporting assembly is provided with a clamping leg corresponding to the clamping hole; the clamping leg is arranged in the clamping hole and is clamped with the reinforcing member.

[0017] Further, the first supporting assembly comprises a clamping member and a connecting member, the clamping member and the connecting member enclose the second mounting groove; the clamping member is in a cylindrical shape and is clamped with the groove wall of the first mounting groove; the connecting member is connected with the side of the limiting boss away from the accommodating groove; and the second supporting assembly is inserted into the second mounting groove from the side away from the connecting member and is clamped with the clamping member.

[0018] Further, the clamping member is provided with a first clamping part on the side away from the second mounting groove, the first mounting groove is provided with a second clamping part, and the first clamping part is clamped and matched with the second clamping part.

[0019] And / or, the clamping member is provided with a positioning groove on the side away from the second mounting groove, the first mounting groove is provided with a positioning boss, and the positioning groove is positioned and matched with the positioning boss.

[0020] Further, a plurality of steel balls are arranged in the accommodating groove; each steel ball is filled between the steel ball and the limiting boss.

[0021] Further, a damping gasket is arranged on the bottom of the first mounting groove and is located between the shell and the mounting member.

[0022] In a second aspect, the application provides a household appliance, comprising:

[0023] An electrical body;

[0024] The caster mechanism as described above, and the shell of the caster mechanism is arranged on the bottom of the electrical body.

[0025] The above technical solutions provided by the present application have the following advantages compared with the prior art:

[0026] In the technical solutions of the present application, the first mounting groove is arranged at the bottom of the shell, and the first mounting groove forms a concave cavity at the bottom of the shell. In this way, when the mounting member is mounted on the shell, most parts of the mounting member are always in the first mounting groove, thereby reducing the overall height of the caster mechanism. Then, the limiting boss for limiting the ball is arranged in the mounting member, the ball can pass through the through hole outside the mounting member, and the ball always has a part in the accommodating groove of the limiting boss and another part outside the through hole. The part outside the through hole can be used to contact the ground. When the caster mechanism is pushed, the part of the ball outside the through hole will start to rotate due to friction. In this way, the ground clearance can be effectively reduced without affecting the rotation and sliding of the caster mechanism, thereby increasing the passing rate of the inclination rate test. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate an embodiment consistent with the present application and, together with the description, serve to explain the principles of the application.

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0029] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings, and these exemplary illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, unless otherwise specified. The drawings in the drawings do not constitute a proportional limitation.

[0030] Figure 1 A cross-sectional view of a caster mechanism and a household appliance according to an embodiment of the present application is shown in the accompanying drawings.

[0031] Figure 2 A cross-sectional view of a caster mechanism and a household appliance according to an embodiment of the present application is shown in the accompanying drawings. Figure 1 An enlarged view of the A view shown in the accompanying drawings is shown.

[0032] Figure 3 An enlarged view of the A view shown in the accompanying drawings is shown. Figure 2 A front view of a first support assembly according to an embodiment of the present application is shown in the accompanying drawings.

[0033] Figure 4 A front view of a first support assembly according to an embodiment of the present application is shown in the accompanying drawings. Figure 3 A back view of a first support assembly according to an embodiment of the present application is shown in the accompanying drawings.

[0034] Figure 5For Figure 2 The structural schematic view of the second support assembly shown in FIG. 1 is shown in FIG. 2.

[0035] Figure 6 For Figure 2 The exploded view structural schematic view of the mounting member and the housing shown in FIG. 1 is shown in FIG. 3.

[0036] Explanation of reference numerals:

[0037] Housing 1, first mounting groove 11a, second clamping portion 111a, positioning boss 111b, mounting member 2, through hole 21b, limiting boss 22, accommodating groove 22a, reinforcing member 221, clamping hole 221a, first inclined surface 2211a, first support assembly 23, second mounting groove 23a, connecting member 231, clamping member 232, first clamping portion 232a, positioning groove 232b, second support assembly 24, clamping leg 241, second inclined surface 241a, steel ball 3, steel ball 4, shock pad 5, caster mechanism 100, electric appliance body 200. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0039] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplifying the present application, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the present application. In addition, reference numerals and / or letters can be repeated in different examples in the present application. Such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0040] For the convenience of description, spatial relative terms can be used in the specification to describe the relative position relationship or movement condition of one element or feature with respect to another element or feature as shown in the drawings, such as "inner", "outer", "inboard", "outboard", "under", "below", "on", "above", "front", "back", and the like. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over or reversed, or the orientation of the device is changed, the directional indications are also changed accordingly, for example: the element described as "under" or "below" another element or feature will be subsequently oriented as "above" or "above" another element or feature. Therefore, the example term "below" can include both upward and downward positions. The device can be additionally oriented (rotated by 90 degrees or in other directions) and the spatial relative relationship descriptors used in the specification are interpreted accordingly.

[0041] In order to solve the technical problem of high ground clearance in the prior art, the application provides a caster mechanism which can reduce the ground clearance of a household appliance.

[0042] The first aspect, Figures 1 to 6 A caster mechanism 100 provided by the embodiment of the application comprises a shell 1, a mounting piece 2, and a ball 3. The bottom of the shell 1 is provided with a first mounting groove 11a. The mounting piece 2 is detachably connected to the first mounting groove 11a. The mounting piece 2 is provided with a cavity and a through hole 21b in communication with the cavity. The through hole 21b is located at the bottom of the mounting piece 2. A limiting boss 22 is arranged in the cavity. The limiting boss 22 extends towards the bottom of the mounting piece 2, and one side of the limiting boss 22 facing the bottom of the mounting piece 2 is provided with a receiving groove 22a. The receiving groove 22a is arranged in correspondence with the through hole 21b. The ball 3 is movably arranged in the through hole 21b, so that a part of the ball 3 is limited in the receiving groove 22a, and the other part is located outside the cavity.

[0043] It can be understood that the overall shape of the first mounting groove 11a is cylindrical, but from the perspective of the shell 1, the first mounting groove 11a is a circular hole. Figure 2The cross-sectional shape of the first mounting groove 11a is rectangular, so the overall shape of the first mounting groove 11a can also be cubic. The bottom of the shell 1 forms a recessed space for mounting the mounting member 2, and when the mounting member 2 is mounted in the first mounting groove 11a, part of the mounting member 2 does not protrude from the shell 1. In order to make the connection between the mounting member 2 and the first mounting groove 11a more secure and prevent the mounting member 2 from coming off the first mounting groove 11a, the overall shape of the mounting member 2 needs to be the same as that of the first mounting groove 11a. The mounting member 2 is detachably mounted in the first mounting groove 11a, which facilitates disassembly and replacement. When the ball 3 is mounted in the containing groove 22a, the limiting boss 22 cooperates with the through hole 21b to allow part of the ball 3 to be in the containing groove 22a and part of the ball 3 to be outside the through hole 21b. This part outside the through hole 21b needs to be in contact with the ground. When this part of the ball 3 is in contact with the ground, the shell 1 will be affected by gravity and will fall towards the ground. At this time, the limiting boss 22 can keep part of the ball 3 in contact with the ground at all times. Therefore, the limiting boss 22 not only has a limiting effect but also has a load-bearing effect. When the caster mechanism 100 needs to be moved, the ball 3 will start to rotate in the containing groove 22a due to friction with the ground. In this way, the caster mechanism 100 can rotate and slide without affecting the caster mechanism 100, effectively reducing the ground clearance and increasing the pass rate of the inclination test.

[0044] As shown in Figure 2 and Figure 3 In the technical solution of the embodiment, the ball 3 is spherical in shape, and the groove wall of the containing groove 22a is arc-shaped.

[0045] It can be understood that the ball 3 is designed to be spherical in shape, and the groove wall of the containing groove 22a is also designed to be arc-shaped. When designing the containing groove 22a and the ball 3, the curvature of the arc-shaped groove wall of the containing groove 22a and the curvature of the ball 3 can be designed to be consistent. In this way, when the ball 3 rotates in the containing groove 22a, the friction between the ball 3 and the containing groove 22a is smaller, allowing the ball 3 to slide more smoothly.

[0046] As shown in Figure 2 In the technical solution of the embodiment, the hole wall of the through hole 21b is arc-shaped and fits the outer wall of the ball 3. The center of the ball 3 is located above the through hole 21b, or the center of the ball 3 coincides with the center of the through hole 21b.

[0047] It can be understood that the hole wall of the through hole 21b is arc-shaped, and the structure that the hole wall is matched with the outer wall surface of the ball 3 can reduce the friction between the ball 3 and the hole wall of the through hole 21b, so that the through hole 21b does not affect the rotation of the ball 3; or the center of the ball 3 is located above the through hole 21b; or the center of the ball 3 coincides with the center of the through hole 21b, so that part of the ball 3 is always in the accommodating groove 22a, and another part of the ball 3 is outside the through hole 21b and in contact with the ground.

[0048] As shown in Figures 2 to 6 , in the technical scheme of the embodiment, the mounting piece 2 comprises: a first support assembly 23 and a second support assembly 24; the first support assembly 23 is arranged in the first mounting groove 11a and is clamped with the shell 1; the first support assembly 23 is provided with a second mounting groove 23a on the side away from the first mounting groove 11a; the limiting boss 22 is arranged in the second mounting groove 23a; the second support assembly 24 is inserted into the second mounting groove 23a and is clamped with the first support assembly 23 to form a cavity; the second support assembly 23 is provided with a through hole 21b on the side away from the first support assembly 23; one end of the limiting boss 22 is connected with the first support assembly 23, and the other end is abutted against the second support assembly 23.

[0049] It can be understood that the first support assembly 23 and the second support assembly 24 are connected in a clamping manner, which can make the ball 3 more convenient to install into the accommodating groove 22a, and because the clamping structure has the characteristics of quick disassembly and assembly, when the part needs to be replaced, only the damaged part needs to be replaced, without replacing the whole mounting piece 2, thereby saving the maintenance cost after use.

[0050] As shown in Figure 3 and Figure 4 , in the technical scheme of the embodiment, the limiting boss 22 is provided with a reinforcing piece 221 on the side away from the accommodating groove 22a, and the reinforcing piece 221 extends to be connected with the groove wall of the second mounting groove 23a.

[0051] It can be understood that the reinforcing piece 221 can enhance the bearing capacity of the limiting boss 22, so that the limiting boss 22 does not deform due to insufficient bearing capacity, thereby preventing the problem that the caster mechanism 100 cannot move.

[0052] As shown in Figure 3 and Figure 4 , in the technical scheme of the embodiment, the reinforcing piece 221 is provided with a plurality of clamping holes 221a; the second support assembly 23 is provided with a clamping leg 241 corresponding to the clamping hole 221a; the clamping leg 241 is arranged in the clamping hole 221a and is clamped with the reinforcing piece 221.

[0053] It can be understood that the clamping foot 241 matches the card hole 221a, and the second support assembly 23 can be stably positioned on the first support assembly 23, so that the second support assembly 23 is not easy to fall off from the first support assembly 23.

[0054] As shown in the technical scheme of the embodiment, the first inclined surface 2211a is arranged on one side of the second mounting groove 23a, and the second inclined surface 241a matched with the first inclined surface 2211a is arranged on the end of the clamping foot 241 away from the second support assembly 23. Figure 2 Figure 5 As shown in the technical scheme of the embodiment, the first inclined surface 2211a is arranged on one side of the second mounting groove 23a, and the second inclined surface 241a matched with the first inclined surface 2211a is arranged on the end of the clamping foot 241 away from the second support assembly 23.

[0055] It can be understood that the first inclined surface 2211a and the second inclined surface 241a cooperate with each other, so that the second support assembly 23 is more convenient to install on the first support assembly 23.

[0056] As shown in the technical scheme of the embodiment, the first support assembly comprises the clamping piece 232 and the connecting piece 231, and the clamping piece 232 and the connecting piece 231 enclose the second mounting groove 23a; the clamping piece 232 is in a cylindrical shape and is clamped with the groove wall of the first mounting groove 11a; the connecting piece 231 is connected to the side of the limiting boss 22 away from the containing groove 22a; and the second support assembly 24 is inserted into the second mounting groove 23a from the side away from the connecting piece 231 and is clamped with the clamping piece 232. Figures 2 to 4 It can be understood that the connecting piece 231 and the clamping piece 232 are in an integral molding structure, the connecting piece 231 can reinforce the position of the limiting boss 22 in the second mounting groove 23a, and the clamping piece 232 plays a role of a side wall on the first support assembly 23, so that the first support assembly 23 is in a whole cover shape and can bear the weight from the shell 1 together with the limiting boss 22.

[0057] As shown in the technical scheme of the embodiment, the clamping piece 232 is provided with the first clamping part 232a on the side away from the second mounting groove 23a, the first mounting groove 11a is provided with the second clamping part 111a, and the first clamping part 232a is clamped and matched with the second clamping part 111a.

[0058] Figures 2 to 6 It can be understood that the first clamping part 232a and the second clamping part 111a cooperate with each other, so that the position of the first support assembly 23 in the first mounting groove 11a is stable.

[0059] As shown in the technical scheme of the embodiment, the clamping piece 232 is provided with the first clamping part 232a on the side away from the second mounting groove 23a, the first mounting groove 11a is provided with the second clamping part 111a, and the first clamping part 232a is clamped and matched with the second clamping part 111a.

[0060] As shown in the technical scheme of the embodiment, the clamping piece 232 is provided with the first clamping part 232a on the side away from the second mounting groove 23a, the first mounting groove 11a is provided with the second clamping part 111a, and the first clamping part 232a is clamped and matched with the second clamping part 111a. Figures 2 to 6 ​​As shown, in the technical solution of this embodiment, the snap-fit ​​member 232 is provided with a positioning groove 232b on the side opposite to the second mounting groove 23a, and the positioning groove 232b extends along a direction parallel to the axis of the snap-fit ​​member 232; the positioning groove 232b passes through one end of the snap-fit ​​member 232 near the connector 231; the first mounting groove 11a is provided with a positioning boss 111b, and the positioning groove 232b and the positioning boss 111b are positioned and engaged.

[0061] Understandably, the positioning groove 232b and the positioning boss 111b cooperate with each other to prevent the first support component 23 from rotating within the first mounting groove 11a, thus ensuring the smooth operation of the caster mechanism 100.

[0062] like Figure 2 and Figure 3 As shown, in the technical solution of this embodiment, a plurality of steel balls 4 are provided in the receiving groove 22a; each steel ball 4 is filled between the ball 3 and the limiting boss 22.

[0063] Understandably, the arrangement of the steel ball 4 can further reduce the friction between the ball 3 and the receiving groove 22a, thus requiring less thrust when pushing the caster mechanism 100.

[0064] like Figure 6 As shown, in the technical solution of this embodiment, the bottom of the first mounting groove 11a is provided with a shock-absorbing pad 5, which is located between the housing 1 and the mounting component 2.

[0065] Understandably, when the caster mechanism 100 encounters bumpy road sections during operation, the shock-absorbing pads 5 can effectively reduce the vibration force, making the reaction force on the mounting component 2 smaller and extending the service life of the mounting component 2.

[0066] Secondly, such as Figure 1 As shown, this application also provides a household appliance, including an electrical body and the caster mechanism 100 as described above. The specific structure of the caster mechanism 100 is as described in the above embodiments. Since the household appliance adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The housing 1 of the caster mechanism 100 is located at the bottom of the appliance body 200.

[0067] It is understandable that household appliances can be any of the following: electric heaters, humidifiers, air purifiers, and electric fans.

[0068] like Figure 6 As shown, in the technical solution of this embodiment, the housing 1 is provided with a plurality of first mounting grooves 11a, each first mounting groove 11a is provided with a mounting component 2, and each mounting component 2 is provided with a ball bearing 3; the bottom shell of the household appliance is provided with a plurality of caster mechanisms 100.

[0069] In the above-described embodiments, the description of each embodiment focuses on different aspects, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0070] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only intended to facilitate the description of the present application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0071] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0072] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be connected, or detachable, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0073] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0074] In the description of the application, reference to "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the application. The appearances of the above expressions in various places in the description are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Moreover, the terms "first", "second", "third", etc. are used herein merely as identifiers that identify a particular order or pattern, rather than to denote a physical, logical, and / or chronological order or pattern. Furthermore, the terms "comprise", "comprising", "include", "including", and the like, specify the presence of stated features, structures, materials, and / or characteristics, but do not preclude the presence or addition of one or more other features, structures, materials, and / or characteristics.

[0075] Obviously, various modifications and changes can be made to the present application by those skilled in the art without departing from the spirit and scope of the application. Accordingly, such modifications and changes are intended to fall within the scope of the application as defined by the appended claims and their equivalents.

[0076] The above descriptions are specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A caster mechanism characterized by, The utility model relates to a shell (1) bottom has first installation groove (11a); Mounting piece (2) is detachably connected with first installation groove (11a);Mounting piece (2) has cavity and the through -hole (21b) that communicates with the cavity, and the through -hole (21b) is located at the bottom of mounting piece (2);The limiting boss (22) in the cavity extends towards the bottom of mounting piece (2), and the side of the limiting boss (22) facing the bottom of mounting piece (2) is provided with accommodating groove (22a);Accommodating groove (22a) is correspondingly arranged with the through -hole (21b); Ball (3) is movably arranged in the through -hole (21b), so that the part of ball (3) is limited in accommodating groove (22a), and the other part is located outside the cavity. Ball (3) is spherical;The groove wall of accommodating groove (22a) is arc surface; 2. The caster mechanism of claim 1, wherein, And / or, the hole wall of the through -hole (21b) is arc surface, and is matched with the outer wall surface of ball (3);The center of ball (3) is located above the through -hole (21b);Or the center of ball (3) coincides with the center of the through -hole (21b). Mounting piece (2) includes:

3. The caster mechanism of claim 1, wherein, First support assembly (23) is arranged in first installation groove (11a) and is clamped with shell (1);The second installation groove (23a) is arranged on the side of first support assembly (23) away from first installation groove (11a);The limiting boss (22) is arranged in the second installation groove (23a); Second support assembly (24) is inserted into the second installation groove (23a) and is clamped with first support assembly (23), to form the cavity;The through -hole (21b) is arranged on the side of second support assembly (24) away from first support assembly (23);One end of the limiting boss (22) is connected with first support assembly (23), and the other end is abutted on second support assembly (24). The side of the limiting boss (22) away from accommodating groove (22a) is provided with reinforcing part (221), and the reinforcing part (221) extends to the groove wall of the second installation groove (23a) and is connected.

4. The caster mechanism of claim 3, wherein, Reinforcing part (221) is provided with a plurality of clamping holes (221a); 5. The caster mechanism of claim 3, wherein, Second support assembly (24) is provided with clamping leg (241) corresponding to clamping hole (221a);Clamping leg (241) is arranged in clamping hole (221a) and is clamped with reinforcing part (221). ​ 6. The caster mechanism of claim 3, wherein, The first support assembly comprises a clamping piece (232) and a connecting piece (231), the clamping piece (232) and the connecting piece (231) enclose the second mounting groove (23a); the clamping piece (232) is cylindrical and clamped with the groove wall of the first mounting groove (11a); the connecting piece (231) is connected to the side of the limiting boss (22) away from the containing groove (22a); the second support assembly (24) is inserted into the second mounting groove (23a) from the side away from the connecting piece (231) and clamped with the clamping piece (232).

7. The caster mechanism of claim 6, wherein, The side of the clamping piece (232) away from the second mounting groove (23a) is provided with a first clamping part (232a), and the first mounting groove (11a) is provided with a second clamping part (111a), the first clamping part (232a) is clamped and matched with the second clamping part (111a); And / or, the side of the clamping piece (232) away from the second mounting groove (23a) is provided with a positioning groove (232b), the positioning groove (232b) extends along the axis direction parallel to the clamping piece (232); the positioning groove (232b) penetrates the end of the clamping piece (232) close to the connecting piece (231); the first mounting groove (11a) is provided with a positioning boss (111b), the positioning groove (232b) is positioned and matched with the positioning boss (111b).

8. The caster mechanism of claim 1, wherein, The containing groove (22a) is provided with a plurality of steel balls (4); each steel ball (4) is filled between the ball (3) and the limiting boss (22).

9. The caster mechanism of claim 1, wherein, The bottom of the first mounting groove (11a) is provided with a shock pad (5) and located between the shell (1) and the mounting piece (2).

10. A domestic appliance characterized in that, Comprise: An electric appliance body (200); The shell (1) of the caster mechanism as claimed in any one of claims 1-9 is arranged at the bottom of the electric appliance body (200).

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