CN219493976U - Concatenation formula iron wire floor decorating lamp - Google Patents

Abstract

The utility model discloses a spliced iron wire floor type decorative lamp, which comprises a floor type bracket, a supporting bracket and a lamp body, wherein the floor type bracket is vertically arranged on the ground or a table top; the floor stand comprises a plurality of sub-stand bodies, wherein every two adjacent sub-stand bodies are circumferentially closed and detachably connected through an alignment locking structure; the floor support is axially divided into a supporting part, an assembling part and a bearing part; the supporting part is vertically arranged on the ground or the table top; the assembly part is used for installing the bearing piece and limiting the radial movement and circumferential distortion of each sub-frame body; the bearing part is used for placing objects; the bearing piece comprises a bracket and a plurality of overlap arms, and each overlap arm radially extends outwards from the periphery of the bracket at intervals and is combined with the assembly part on each sub-frame body; the bracket is used for placing objects or mounting a lamp body; a lamp body disposed on the ground, the bracket, or the receiving portion; the floor decorating lamp solves the problems of large volume, high transportation cost and small application range of the existing floor decorating lamp.

Description

Concatenation formula iron wire floor decorating lamp

Technical Field

The utility model relates to the field of lamp manufacturing, in particular to a spliced iron wire floor type decorative lamp.

Background

The existing lamps are divided into a plurality of common modes, such as a desk lamp, a pendant lamp, a floor lamp and the like, and the lamps are configured in different occasions to show different visual effects; currently, conventional floor lamps are often placed beside indoor sofas, study rooms and other areas, and are popular in europe as illumination during reading; in China, the requirements of people on interior decoration are continuously improved, and the floor lamp is also deeply favored;

however, most of the existing floor lamps are integrated large-volume lamps, the occupied space is large, the transportation cost is high, especially for overseas export transportation, the overseas transportation cost is calculated by cubic meters, the huge volume causes high transportation cost, the production party and the sales party have no profit space, and most of the production parties can only reduce the quality in terms of raw materials and manufacturing; in addition, the existing floor lamp only has a conventional lighting function, cannot be combined with other decorations, and is more difficult to use outdoors; besides, the manufacturing difficulty is high, a large number of welding and other processes are needed for fixing, then polishing, paint spraying and the like are needed, and the combination with the lighting assembly is difficult to assemble;

in summary, the existing floor lamp needs to be further improved to meet the requirements of transportation, production and assembly and improvement of application range.

Disclosure of Invention

The utility model aims to overcome the defects or problems in the background art and provide the spliced iron wire floor decorating lamp which has the advantages of simple structure, simple and convenient manufacture, easy realization and low cost, and solves the problems of large volume, high transportation cost and small application range of the existing floor lamp.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

a spliced iron wire floor decorative lamp comprises a floor bracket, a bearing piece and a lamp body;

the floor bracket is vertically arranged on the ground or the table top; the floor stand comprises a plurality of sub-stand bodies, wherein every two adjacent sub-stand bodies are circumferentially closed and detachably connected through an alignment locking structure; the floor support is axially divided into a supporting part, an assembling part and a bearing part; the supporting part is vertically arranged on the ground or the table top; the assembly part is used for installing the bearing piece and limiting the radial movement and circumferential distortion of each sub-frame body; the bearing part is used for placing objects;

the bearing piece comprises a bracket and a plurality of overlap arms, and each overlap arm radially extends outwards from the periphery of the bracket at intervals and is combined with the assembly part on each sub-frame body; the bracket is used for placing objects or mounting a lamp body;

and a lamp body configured on the ground, the bracket or the bearing part.

Further, the alignment locking structure comprises a butt joint groove and a joint part which are matched with each other; the butt joint groove and the combination groove are respectively arranged at two side ends of the split frame body in the circumferential direction; the butt joint groove on the two split frames connected with each other is connected with the joint part, and the two split frames are spanned by a buckling piece and nested at the joint part of the butt joint groove and the joint part so as to limit the joint part from falling out of the butt joint groove.

Further, the buckling piece is hinged to the split frame body and is close to one end of the butt joint groove; the buckling piece comprises a hinge part and a limit part which are connected into a whole, and the limit part is formed into a U shape by surrounding three limit surfaces; the buckling piece rotates through the hinge part to drive the limiting part to be nested relative to the joint of the butt joint groove and the combining part, so that the combining part is limited to be separated from the butt joint groove.

Further, the butt joint groove is in a dovetail shape, the opening of the butt joint groove is inclined from the free end towards the inside of the groove to form a matching surface, and the position, corresponding to the matching surface, of the combining part forms an abutting surface.

Further, each split frame body comprises at least three connecting arms and a plurality of supporting rods; each connecting arm is arc-shaped and is arranged at intervals in parallel along the axial direction; each supporting rod is distributed at intervals along the circumferential direction and is respectively connected and fixed with each connecting arm so as to form a hollowed-out sub-frame body; the butt joint groove and the combination groove are respectively formed at two ends of the connecting arm in the length direction.

Further, the portion of the support rod between the assembly portion and the bearing portion is outwards curved in an arc shape, and the portion of the support rod between the assembly portion and the support portion is vertically arranged.

Further, the connecting arms and the supporting rods are made of iron or copper.

Further, the lamp body comprises a lamp holder, a lamp shade, a luminous body and an electric control component, wherein the electric control component and the luminous body are respectively arranged in the lamp holder and are covered by the lamp cover; the lamp holder is also provided with a screw connection part and/or a clamping connection part which are assembled with the bracket.

Further, the device also comprises a limiting structure for limiting and connecting the overlap arm and the assembly part; the limiting structure comprises an assembly groove and a locking post, wherein the locking post is formed on the assembly part and is arranged in a dislocation manner with the alignment locking structure; the assembly groove is in a calabash shape and is formed on the overlap arm; each overlap joint arm is sleeved corresponding to the corresponding lock catch column and rotates by a certain angle along the circumferential direction, so that the lock catch column is clamped into the small groove from the large groove in the assembly groove to be limited.

From the above description of the present utility model, compared with the prior art, the present utility model has the following advantages:

the utility model provides a spliced iron wire floor decorating lamp which is simple in structure, simple and convenient to manufacture, easy to implement and low in cost, and solves the problems of large size, high transportation cost and small application range of the existing floor decorating lamp; the floor stand is divided into a plurality of split stand bodies, the original volume is reduced to below 1/5, meanwhile, the split stand bodies are easily connected through the alignment locking structures, each alignment locking structure has clear directivity, is not easy to be assembled by mistake or is not assembled by mistake, the transportation cost of an overseas outlet is reduced, the split stand is more convenient to assemble and disassemble, can be detached and placed, occupies less space and can be carried outdoors, a lamp with illumination, storage and attractive decoration can be easily built, for example, transparent glass is placed on a bearing part, the split stand can be used as a glass table, the split stand also has an illumination function in the position of an assembling part, and the split stand is combined to present light vision with aesthetic feeling; the novel bearing piece not only can be used for installing the lamp body and bearing articles, but also has the functions of preventing distortion and stabilizing the floor support, so that the strength and the supporting capacity of the whole floor decorative lamp are comparable with those of an integrated forming or fixedly connecting mode; the floor decorating lamp has the advantages of small volume, easy installation, wide application range, high aesthetic degree, high strength, stability and the like.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required to be used in the description of the embodiments below are briefly introduced, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a three-dimensional exploded structure of a wire floor decorating lamp according to the present utility model;

FIG. 2 is a schematic perspective view of a wire-falling decorative lamp according to the present utility model;

FIG. 3 is an enlarged view of portion A of FIG. 1 in accordance with the present utility model;

FIG. 4 is a schematic perspective view of a carrier according to the present utility model;

FIG. 5 is a schematic perspective view of a lamp body according to the present utility model;

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It is to be understood that the described embodiments are preferred embodiments of the utility model and should not be taken as excluding other embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without creative efforts, are within the protection scope of the present utility model.

In the claims, specification and drawings hereof, unless explicitly defined otherwise, the terms "first," "second," or "third," etc., are used for distinguishing between different objects and not for describing a particular sequential order.

In the claims, specification and drawings hereof, unless explicitly defined otherwise, references to orientation terms such as "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counter-clockwise", etc., are based on the orientation and positional relationship shown in the drawings and are for convenience of description and simplicity of description only, and do not indicate or imply that the apparatus or element referred to must have or be constructed and operated in a particular orientation, nor should it be construed as limiting the particular scope of protection of the utility model.

In the claims, specification and drawings of the present utility model, unless explicitly defined otherwise, the term "fixedly connected" or "fixedly connected" should be construed broadly, i.e. any connection between them without a displacement relationship or a relative rotation relationship, that is to say includes non-detachably fixedly connected, integrally connected and fixedly connected by other means or elements.

In the claims, specification and drawings of the present utility model, the terms "comprising," having, "and variations thereof as used herein, are intended to be" including but not limited to.

Referring to fig. 1-5, the spliced iron wire floor decorating lamp comprises a floor bracket 1, a bearing piece 2 and a lamp body 3;

the floor stand 1 is vertically arranged on the ground or a table top; the table top can be a table top, a storage table, a television cabinet and the like;

the floor stand 1 comprises a plurality of sub-stand bodies 4, wherein each two adjacent sub-stand bodies 4 are respectively circumferentially combined and detachably connected through an alignment locking structure 5;

it should be noted that each of the split frame bodies 4 in the present utility model includes at least three connecting arms 41 and a plurality of supporting rods 42 (in the present utility model, the connecting arms 41 and the supporting rods 42 are made of iron or copper, preferably iron); each of the three connecting arms 41 is arc-shaped and arranged in parallel and at intervals along the axial direction (i.e. vertically); the struts 42 are circumferentially spaced and fixed with the connecting arms 41 respectively to form hollow-out sub-frames 4; wherein the butt groove 51 and the combining part 52 of the alignment locking structure 5 are respectively formed at two ends of the connecting arm 41 in the length direction;

the floor stand 1 is axially divided into a supporting part 11, an assembling part 12 and a bearing part 13;

the supporting part 11 is vertically arranged on the ground or the table top; the assembling part 12 is used for installing the bearing piece 2 and is used for limiting the radial movement and circumferential distortion of each sub-frame body 4; the bearing part 13 is used for placing objects, such as a glass table top or a plant pot, etc.; the portion of the strut 42 between the assembly portion 12 and the bearing portion 13 is curved outwards in an arc shape (i.e. rounded into a sphere or ellipse), and the portion between the assembly portion 12 and the support portion 11 is disposed vertically.

A carrier 2 including a bracket 21 and a plurality of bridging arms 22, each bridging arm 22 extending radially from the outer circumference of the bracket 21 and being coupled to the fitting portion 12 of each sub-frame 4; the bracket 21 is used for placing objects or installing the lamp body 3; the bearing piece 2 is also connected with the assembling part 12 through the limiting structure 6 so as to improve the stability of the bearing piece and prevent distortion, stress loosening and the like; specifically, the limiting structure 6 is used for limiting and connecting the overlap arm 22 and the assembly part 12; the limiting structure 6 comprises an assembly groove 61 and a locking post 62, wherein the locking post 62 is formed on the assembly part 12 and is arranged in a dislocation manner with the alignment locking structure 5; the assembly groove 61 is shaped like a gourd and is formed on the overlap arm 22; wherein, each overlap arm 22 is sleeved corresponding to the lock post 62, and rotates a certain angle along the circumferential direction, so that the lock post 62 is limited by being clamped into the small groove 612 by the large groove 611 in the gourd-shaped assembly groove.

A lamp body 3 provided on the ground, the bracket 21, or the receiving portion 13; it should be noted that, the lamp body 3 of the present utility model includes a lamp holder 31, a lamp cover 32, a light emitting body (not shown in the figure) and an electric control assembly 33, wherein the electric control assembly 33 and the light emitting body (not shown in the figure) are respectively installed in the lamp holder 31 and are covered by the lamp cover 32; the lamp holder 31 is further formed with a screw portion 311 and/or a clip portion 312 assembled with the bracket 21;

more specifically, the alignment locking structure 5 includes a mating groove 51 and a coupling portion 52 that are matched with each other; the butt joint groove 51 and the combining part 52 are respectively arranged at two lateral ends of the split frame body 4 in the circumferential direction; in the present utility model, the butt-joint groove 51 is disposed in a dovetail shape, and the opening thereof is inclined from the free end toward the inside of the groove to form a mating surface 511, and the mating surface 511 is formed on the joint portion 52 in correspondence with the mating surface 511; wherein, the butt joint groove 51 on the two connected split frames 4 is butted with the joint part 52, and the butt joint groove 51 and the joint part 52 are nested by a buckling piece which spans the two split frames 4, so as to limit the joint part 52 from falling out of the butt joint groove 51.

More specifically, the fastener 7 is hinged to the split frame body 4 and is close to one end of the butt-joint groove 51; the buckling piece 7 comprises a hinge part 71 and a limiting part 72 which are connected into a whole, and the limiting part 72 is surrounded by three limiting surfaces to form a U-shaped piece; wherein, the fastener 7 rotates through the hinge 71 to drive the limiting portion 72 to nest with the junction of the abutting groove 51 and the combining portion 52, so as to limit the combining portion 52 from being separated from the abutting groove 51.

1-5, a spliced iron wire floor decorating lamp mainly comprises the following components: the floor stand 1, the supporting part 11, the assembling part 12, the bearing part 13, the bearing part 2, the bracket 21, the overlap arm 22, the lamp body 3, the lamp holder 31, the lamp shade 32, the illuminant (not shown in the figure), the electric control component 33, the sub-frame body 4, the connecting arm 41, the strut 42, the alignment locking structure 5, the docking slot 51, the combining part 52, the matching surface 511, the abutting surface 521, the assembling slot 61, the latch post 62, the buckling piece 7, the hinge part 71 and the limiting part 72;

the actual preparation and use are as follows:

(1) Preparing connecting arms 41, wherein each connecting arm 41 is distributed in equal parts in concentric circles with different diameters, for example, in equal parts of three, namely, 3 connecting arms 41 are combined into a whole circle; in the present utility model, the diameters of the receiving portion 13, the assembling portion 12 and the connecting arm 41 on the supporting portion 11 are different, and the diameter of the connecting arm 41 of the supporting portion 11 is the largest; then, preparing a butt-joint groove 51 and a joint part 52 at two ends of the connecting arm 41 in the length direction, and stamping and forming by a cold stamping die, wherein the butt-joint groove 51 is dovetail-shaped, and the side wall at the opening of the butt-joint groove 51 is obliquely provided with a matching surface 511, so that the assembly is easier, the manufacturing precision is reduced, and the matching surface 511 is matched with an abutting surface 521 which is obliquely arranged on the joint part 52, so that the anti-drop effect is better;

the connecting arm 41 is then marked in a position to mate with the strut 42;

the connecting arm 41 of the assembly part 12 is further fixed with a locking post 62 by welding, which is arranged in a dislocation manner with the butt joint groove 51 and the combining part 52, and is matched with the lap joint arm 22 on the bearing part 2 in the subsequent step;

(2) Preparing a strut 42, which is made of iron thin rods; each strut 42 is provided with a curved arc section and a vertical section, wherein the arc section is positioned between the bearing part 13 and the assembling part 12, and the vertical section is used for supporting and is positioned between the assembling part 12 and the supporting part 11; during assembly, one end of the supporting rod 42 is fixed on the connecting arm 41 at the position of the assembling part 12 on the connecting arm 41 at the position of the bearing part 13 in a welding mode, a through hole is formed in the connecting arm 41 for the supporting rod 42 to penetrate through and be fixed, and finally the connecting arm 41 at the position of the supporting part 11 is welded and fixed with the other free end of the supporting rod 42 to form a finished split frame body 4; in this way other sub-frames are prepared

(3) Assembling the buckling piece 7, wherein the buckling piece 7 is formed by pressing a metal sheet, namely a U-shaped piece formed by three limiting surfaces, and the hinge part 71 of the U-shaped piece is arranged on the connecting arm 41 through a hinge shaft and is close to the butt joint groove 51 (the arrangement ensures that the buckling cladding is easier to realize, the volume of the buckling piece 7 can be made smaller, and meanwhile, the buckling piece can also be spanned to the combining part 52, so that the appearance is more attractive, and the connecting position is not easy to see;

(4) The carrier 2 is prepared and comprises a bracket 21 and a lap joint arm 22, wherein a circular ring is taken as the bracket 21 in the novel model, and the bracket 21 with other shapes can be used for placing a lamp body or an object; in the present utility model, the ring is used for being screwed or clamped with the lamp body 3, the overlap joint arm 22 extends radially outwards from the peripheral wall of the ring 21 (preferably extends at equal intervals), then a gourd-shaped assembly groove 61 is formed on the overlap joint arm 22 by punching (the assembly groove 61 has a large groove position 611 and a small groove position 612 which are connected into a whole), and finally the ring is connected with the overlap joint arm 22 into a whole by welding;

(5) The lamp body 3 is assembled, the novel lamp body 3 comprises a lamp holder 31, a lampshade 32, a luminous body (not shown in the figure) and an electric control assembly 33, wherein the electric control assembly 33 and the luminous body (not shown in the figure) are respectively arranged in the lamp holder 31 and are covered by the lampshade 32; the lamp holder 31 is further formed with a screw portion 311 and/or a clip portion 312 assembled with the bracket 21; the electric control assembly 33 may be an electric control module connected to the mains supply, or may be an electric control module powered by a battery (i.e. used outdoors), which is not described in detail in the prior art;

when in use, the utility model is characterized in that: after the user purchases, the split frame bodies 4 which are equally divided can be automatically installed according to the requirements, and the split frame bodies 4 are taken out and correspond to the positions, the combining parts 52 in the two adjacent split frame bodies 4 correspond to the butt joint grooves 51, wherein the combining parts 52 are correspondingly arranged in the butt joint grooves 51, the buckling pieces 7 are rotated to enable the buckling pieces to rotate by taking the rotating shafts as axes, and the positions where the combining parts 52 are connected with the butt joint grooves 51 are embedded and covered; the rest sub-frames 4 are in butt joint one by one in the assembly mode and are enclosed into a floor stand 1; then, the lamp holder 31 is fixed on the bracket 21 of the bearing piece 2 in a threaded or snap-in mode, and then the snap-lock posts 62 on the assembly part 12 are sleeved by the lap joint arms 22 respectively, in the process, the snap-lock posts 62 are sleeved by the large groove 611 of the gourd-shaped assembly groove 61 correspondingly, and then the small groove 612 of the assembly groove 61 is circumferentially rotated for a certain angle to be in limited fit with the snap-lock posts 62, so that the installation is convenient, the stability is better, and looseness and shaking are not easy to generate; finally, the glass table can be placed indoors to serve as a reading lamp, and meanwhile, a glass table top can be placed at the position of the bearing part 13 to serve as a storage table; the plant pot culture and the like can be put between the bearing part 13 and the assembling part 12, so that the lamp is more beautiful under the irradiation of the lamp light (the lamp body can also be hung on the bearing piece, and the upper surface of the bearing piece can also be used for placing objects and the like); of course, the lamp is also conveniently taken to the open air or used on a balcony, is used as an outdoor camping lamp, and the like, is convenient to carry, wide in application range, and quite simple and convenient to assemble and disassemble, is multipurpose, and is popular with users.

The utility model provides a spliced iron wire floor decorating lamp which is simple in structure, simple and convenient to manufacture, easy to implement and low in cost, and solves the problems of large size, high transportation cost and small application range of the existing floor decorating lamp; the floor stand is divided into a plurality of split stand bodies, the original volume is reduced to below 1/5, meanwhile, the split stand bodies are easily connected through the alignment locking structures, each alignment locking structure has clear directivity, is not easy to be assembled by mistake or is not assembled by mistake, the transportation cost of an overseas outlet is reduced, the split stand is more convenient to assemble and disassemble, can be detached and placed, occupies less space and can be carried outdoors, a lamp with illumination, storage and attractive decoration can be easily built, for example, transparent glass is placed on a bearing part, the split stand can be used as a glass table, the split stand also has an illumination function in the position of an assembling part, and the split stand is combined to present light vision with aesthetic feeling; the novel bearing piece not only can be used for installing the lamp body and bearing articles, but also has the functions of preventing distortion and stabilizing the floor support, so that the strength and the supporting capacity of the whole floor decorative lamp are comparable with those of an integrated forming or fixedly connecting mode; the floor decorating lamp has the advantages of small volume, easy installation, wide application range, high aesthetic degree, high strength, stability and the like.

The foregoing description of the embodiments and description is presented to illustrate the scope of the utility model, but is not to be construed as limiting the scope of the utility model.

Claims (9)

1. The utility model provides a concatenation formula iron wire floor decorating lamp which characterized in that: the floor decorating lamp comprises a floor bracket, a bearing piece and a lamp body;

the floor bracket is vertically arranged on the ground or the table top; the floor stand comprises a plurality of sub-stand bodies, wherein every two adjacent sub-stand bodies are circumferentially closed and detachably connected through an alignment locking structure; the floor support is axially divided into a supporting part, an assembling part and a bearing part; the supporting part is vertically arranged on the ground or the table top; the assembly part is used for installing the bearing piece and limiting the radial movement and circumferential distortion of each sub-frame body; the bearing part is used for placing objects;

the bearing piece comprises a bracket and a plurality of overlap arms, and each overlap arm radially extends outwards from the periphery of the bracket at intervals and is combined with the assembly part on each sub-frame body; the bracket is used for placing objects or mounting a lamp body;

and a lamp body configured on the ground, the bracket or the bearing part.

2. A spliced wire floor decorating lamp as defined in claim 1, wherein: the alignment locking structure comprises a butt joint groove and a joint part which are matched with each other; the butt joint groove and the combination groove are respectively arranged at two side ends of the split frame body in the circumferential direction; the butt joint groove on the two split frames connected with each other is connected with the joint part, and the two split frames are spanned by a buckling piece and nested at the joint part of the butt joint groove and the joint part so as to limit the joint part from falling out of the butt joint groove.

3. A spliced wire floor decorating lamp as defined in claim 2, wherein: the buckling piece is hinged to the split frame body and is close to one end of the butt joint groove; the buckling piece comprises a hinge part and a limit part which are connected into a whole, and the limit part is formed into a U shape by surrounding three limit surfaces; the buckling piece rotates through the hinge part to drive the limiting part to be nested relative to the joint of the butt joint groove and the combining part, so that the combining part is limited to be separated from the butt joint groove.

4. A spliced wire floor decorating lamp as defined in claim 3, wherein: the butt joint groove is in a dovetail shape, the opening of the butt joint groove is inclined from the free end towards the inside of the groove to form a matching surface, and the position of the combining part corresponding to the matching surface forms an abutting surface.

5. A spliced wire floor decorating lamp as defined in claim 2, 3 or 4, wherein: each split frame body comprises at least three connecting arms and a plurality of supporting rods; each connecting arm is arc-shaped and is arranged at intervals in parallel along the axial direction; each supporting rod is distributed at intervals along the circumferential direction and is respectively connected and fixed with each connecting arm so as to form a hollowed-out sub-frame body; the butt joint groove and the combination groove are respectively formed at two ends of the connecting arm in the length direction.

6. A spliced wire floor decorating lamp as defined in claim 5, wherein: the part of the support rod between the assembly part and the bearing part is outwards curved in an arc shape, and the part from the assembly part to the supporting part is vertically arranged.

7. The spliced wire floor decorating lamp of claim 6, wherein: the connecting arms and the supporting rods are made of iron or copper.

8. A spliced wire floor decorating lamp as defined in claim 1, wherein: the lamp body comprises a lamp holder, a lamp shade, a luminous body and an electric control assembly, wherein the electric control assembly and the luminous body are respectively arranged in the lamp holder and are covered by the lamp cover; the lamp holder is also provided with a screw connection part and/or a clamping connection part which are assembled with the bracket.

9. A spliced wire floor decorating lamp as defined in claim 1, wherein: the device also comprises a limiting structure for limiting and connecting the overlap arm and the assembly part; the limiting structure comprises an assembly groove and a locking post, wherein the locking post is formed on the assembly part and is arranged in a dislocation manner with the alignment locking structure; the assembly groove is in a calabash shape and is formed on the overlap arm; each overlap joint arm is sleeved corresponding to the corresponding lock catch column and rotates by a certain angle along the circumferential direction, so that the lock catch column is clamped into the small groove from the large groove in the assembly groove to be limited.