Connecting structure and child dining chair

Abstract

The utility model discloses a connecting structure and a child dining chair, belongs to the technical field of child products, and aims to solve the problem that an existing locking piece can automatically reset under the action of an elastic piece after being unlocked. The connecting structure comprises a first connecting piece and a second connecting piece, a second connector; when the locking assembly is located at the locking position, the first connecting piece and the second connecting piece are relatively fixed; when the locking assembly is located at the unlocking position, the first connecting piece and the second connecting piece can rotate relatively; and the limiting assembly comprises a first limiting piece and a second limiting piece, and the limiting assembly can enable the locking assembly to be in the state of the unlocking position continuously. According to the connecting structure and the child dining chair, when the connecting structure is located at the unlocking position, the limiting assembly enables the locking piece to be in the unlocking state continuously, that is, the locking piece is in the state that the locking piece retreats from the locking groove continuously, the end of the locking piece cannot stretch out and cannot interfere with or collide with surrounding structures, and use is safer.

Description

TECHNICAL FIELD

[0001] The utility model relates to children's products technical field, especially connecting structure and children's dining chair. BACKGROUND

[0002] In order to facilitate use, the many children's dining chair seat's table board is the structure of turnover. The table board is just located in the front of children when lying flat, and convenient to use, the table board increases the space of seat when standing, and it is convenient for children to go in and out.

[0003] The table board can switch between lying flat state and standing state, so the rotatable structure is set on the table board. In order to improve the stability when the table board lies flat, the locking piece is usually set on the table board. When the table board lies flat, the locking piece is inserted into the limiting hole, so that the table board is continuously and stably in the lying flat state. When the table board needs to be erected, the locking piece is pulled out of the limiting hole first, and the table board is rotated until the standing state is reached.

[0004] The defects of the children's dining chair seat include that the locking piece will reset under the action of the elastic piece after unlocking, resulting in the locking tongue exposed, easy to collide with surrounding articles, poor in appearance and having safety hazards. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing connecting structure and children's dining chair, solve the problem that the existing locking piece resets under the action of the elastic piece after unlocking, and is safer to use.

[0006] To achieve this purpose, on the one hand, the utility model adopts the following technical scheme:

[0007] The connecting structure comprises: a first connecting piece; a second connecting piece movably connected with the first connecting piece; a locking assembly, when the locking assembly is in a locking position, the first connecting piece and the second connecting piece are relatively fixed; when the locking assembly is in an unlocking position, the first connecting piece and the second connecting piece can relatively rotate; and a limiting assembly comprising a first limiting piece and a second limiting piece, the first limiting piece is arranged on one of the first connecting piece and the second connecting piece, the second limiting piece is arranged on the other one of the first connecting piece and the second connecting piece, and the limiting assembly can continuously keep the locking assembly in the unlocking position.

[0008] In one preferred embodiment, the locking assembly comprises a locking piece and a locking groove, the locking piece is arranged on one of the first connecting piece and the second connecting piece, and the locking groove is arranged on the other one of the first connecting piece and the second connecting piece; when the locking piece is at least partially inserted into the locking groove, the connecting structure is in a locked position; when the locking piece is completely withdrawn from the locking groove, the connecting structure is in an unlocked position; when the connecting structure is in the unlocked position, the limiting assembly can keep the locking piece in the state of being withdrawn from the locking groove.

[0009] In one preferred embodiment, the first limiting piece comprises a first limiting piece main body and a hook boss connected with each other, the second limiting piece is provided with a straight section and an arc section connected with each other, and the hook boss can be embedded in and moved along the straight section and the arc section; when the hook boss is embedded in the arc section, the limiting assembly keeps the locking piece in the state of being withdrawn from the locking groove.

[0010] In one preferred embodiment, the first limiting piece is provided with a moving limiting groove, and the connecting structure is provided with a moving limiting boss embedded in the moving limiting groove, and the first limiting piece can move along the extension direction of the moving limiting boss.

[0011] In one preferred embodiment, the locking piece comprises a lock tongue, a sliding block and a reset elastic piece, the lock tongue and the sliding block are fixedly connected, and the reset elastic piece has a tendency to move the lock tongue and the sliding block towards the locking groove.

[0012] In one preferred embodiment, the first limiting piece comprises a first limiting piece main body, the first limiting piece main body is formed with an unlocking limiting inclined surface, the sliding block is formed with a sliding block limiting inclined surface matched with the unlocking limiting inclined surface, and when unlocking, the first limiting piece pushes the sliding block to move away from the locking groove through the unlocking limiting inclined surface.

[0013] In one preferred embodiment, the sliding block is provided with a penetrating groove and a lock tongue connecting groove, the lock tongue is partially penetrated in the penetrating groove, and a set included angle is formed between the extension directions of the penetrating groove and the lock tongue connecting groove.

[0014] In one preferred embodiment, the first connecting piece comprises a horizontal pipe and a rotating block fixedly connected, and the rotating block can rotate around the axis of the horizontal pipe.

[0015] In one preferred embodiment, the second connecting member is provided with a plug-in part for plugging with the horizontal pipe, the plug-in part is provided with a plug-in locking hole, a plug-in locking member is partially arranged in the plug-in locking hole, the rotating block is provided with a limiting long hole, and the plug-in locking member can relatively move along the extending direction of the limiting long hole when the rotating block rotates around the axis of the horizontal pipe.

[0016] In one preferred embodiment, the connecting structure is in the locked position when the plug-in locking member abuts against one end of the limiting long hole, and the connecting structure is in the unlocked position when the plug-in locking member abuts against the other end of the limiting long hole.

[0017] In another aspect, the utility model adopts the following technical scheme:

[0018] The child dining chair comprises the connecting structure, the first connecting member is a rotating block connected to the bottom plate surface, and the second connecting member is a sliding assembly.

[0019] The connecting structure disclosed by the utility model comprises a first connecting member, a second connecting member, a locking assembly and a limiting assembly, the limiting assembly can keep the locking assembly in the unlocked position, the end of the locking member cannot protrude, interference or collision with surrounding structures cannot occur, and use is safer.

[0020] The child dining chair disclosed by the utility model comprises the connecting structure, the locking member keeps in the retracted state after being unlocked, interference or collision with surrounding structures caused by the end of the locking member protruding outward is avoided, and use experience is better. DRAWINGS

[0021] Figure 1 is a structural schematic view of a child dining chair provided by the embodiment of the utility model;

[0022] Figure 2 is a structural schematic view of a child dining chair when the bottom plate surface is in the use state;

[0023] Figure 3 is a side view of a child dining chair when the bottom plate surface is in the use state;

[0024] Figure 4 is a structural schematic view of a child dining chair when the bottom plate surface is in the folded state;

[0025] Figure 5 is a side view of a child dining chair when the bottom plate surface is in the folded state;

[0026] Figure 6is one of structural schematic diagrams of the first connecting piece and the second connecting piece provided in the embodiment of the utility model;

[0027] Figure 7 is two of structural schematic diagrams of the first connecting piece and the second connecting piece provided in the embodiment of the utility model;

[0028] Figure 8 is an explosion view of the bottom plate surface and the connecting structure provided in the embodiment of the utility model;

[0029] Figure 9 is Figure 8 is a local enlarged view of A in the middle;

[0030] Figure 10 is one of structural schematic diagrams of the first limiting piece provided in the embodiment of the utility model;

[0031] Figure 11 is two of structural schematic diagrams of the first limiting piece provided in the embodiment of the utility model;

[0032] Figure 12 is a combined structural schematic diagram of the second limiting piece and the plug-in part provided in the embodiment of the utility model;

[0033] Figure 13 is a structural schematic diagram of the sliding block provided in the embodiment of the utility model;

[0034] Figure 14 is a position schematic diagram of the pull hook boss in the straight section in the locked state provided in the embodiment of the utility model;

[0035] Figure 15 is a local structural schematic diagram of the connecting structure in the locked state provided in the embodiment of the utility model;

[0036] Figure 16 is a local structural sectional view of the connecting structure in the locked state provided in the embodiment of the utility model;

[0037] Figure 17 is a schematic diagram of the connecting structure in the unlocked state provided in the embodiment of the utility model;

[0038] Figure 18 is the relative position relation between the second connecting piece and the rotating block in the unlocked state provided in the embodiment of the utility model;

[0039] Figure 19 is a position schematic diagram of the pull hook boss in the straight section in the unlocked state provided in the embodiment of the utility model;

[0040] Figure 20is the partial structure schematic view of the connecting structure in the unlocking state provided by the embodiment of the utility model;

[0041] Figure 21 is the partial structure sectional view of the connecting structure in the unlocking state provided by the embodiment of the utility model;

[0042] Figure 22 is the connecting structure schematic view in the rotating state provided by the embodiment of the utility model;

[0043] Figure 23 is the relative position relation between the second connecting piece and the rotating block in the rotating state provided by the embodiment of the utility model;

[0044] Figure 24 is the position schematic view of the pull hook boss in the arc segment in the rotating state provided by the embodiment of the utility model.

[0045] In the drawing,

[0046] 1, first connecting piece;2, second connecting piece;11, moving limit boss;12, cross pipe;13, rotating block;14, lock tongue perforation;15, locking limit piece accommodating cavity;16, pull hook boss passes out hole;17, sliding block limit surface;21, locking recess;22, plug-in part;23, plug-in locking hole;24, plug-in locking piece;31, first limit piece;32, second limit piece;41, lock tongue;42, sliding block;43, reset elastic piece;44, bolt;100, bottom plate surface;131, limit long hole;311, first limit piece main body;312, pull hook boss;313, moving limit groove;314, unlocking limit inclined surface;321, straight segment;322, arc segment;421, sliding block limit inclined surface;422, pass through groove;423, lock tongue connecting groove;424, limit step. Specific embodiments

[0047] In order to make the above purpose, features and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model are explained in detail below in conjunction with the drawings. In the following description, a lot of specific details are set forth in order to fully understand the utility model. But the utility model can be implemented in many other ways different from the description, and those skilled in the art can make similar improvements without departing from the connotation of the utility model, so the utility model is not limited by the following disclosed specific embodiments.

[0048] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0049] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0050] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0051] In the utility model, unless otherwise specifically defined and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be that the first feature is directly above or 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 "below", "below" and "below" of the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0052] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0053] This embodiment discloses a connection structure and a children's high chair including the connection structure. Figures 1 to 5 The image shows the children's high chair in this embodiment. Figures 6 to 9 As shown, the connection structure includes a first connector 1, a second connector 2, a locking component, and a limiting component. The second connector 2 is movably connected to the first connector 1. When the locking component is in the locked position, the first connector 1 and the second connector 2 are relatively fixed, and the limiting component allows the locking component to remain in the unlocked position. When the locking component is in the unlocked position, the first connector 1 and the second connector 2 can rotate relative to each other. In this embodiment, the base plate 100 of the children's high chair is mounted on a rotating block that serves as the first connector 1. The second connector 2 is a sliding component, which can be, but is not limited to, mounted on the high chair support leg (not shown).

[0054] In this embodiment, the locking assembly includes a locking member and a locking groove 21. The locking member is disposed on one of the first connecting member 1 and the second connecting member 2, and the locking groove 21 is disposed on the other of the first connecting member 1 and the second connecting member 2. When the locking member is at least partially inserted into the locking groove 21, the connecting structure is in the locked position; when the locking member is completely withdrawn from the locking groove 21, the connecting structure is in the unlocked position. In this embodiment, the locking member is disposed on the first connecting member 1, and the locking groove 21 is disposed on the second connecting member 2. The limiting assembly includes a first limiting member 31 and a second limiting member 32. The first limiting member 31 is disposed on one of the first connecting member 1 and the second connecting member 2, and the second limiting member 32 is disposed on the other of the first connecting member 1 and the second connecting member 2. In this embodiment, the first limiting member 31 is disposed on the first connecting member 1, and the second limiting member 32 is disposed on the second connecting member 2.

[0055] When the connecting structure is in the unlocked position, the limiting component keeps the locking member in the state of being out of the locking groove 21, that is, the locking member is always in the unlocked state, the end of the locking member will not protrude, and will not interfere with or collide with the surrounding structure, making it safer to use.

[0056] like Figure 10 and Figure 11 As shown, the first limiting member 31 includes a first limiting member body 311 and a hook boss 312 connected to each other.Figure 12 As shown, the second limiting member 32 is provided with a straight section 321 and an arc section 322 connected with each other, and the hook boss 312 can be embedded in and moved along the straight section 321 and the arc section 322. The first connecting member 1 is provided with a hook boss passing hole 16, and the hook boss 312 can extend out of the hook boss passing hole 16 to be embedded in the straight section 321 and the arc section 322, thus being more convenient to use.

[0057] When the hook boss 312 is embedded in the straight section 321, the end of the locking member will gradually move away from the locking groove 21 when the hook boss 312 moves upward, and the end of the locking member will gradually move close to the locking groove 21 when the hook boss 312 moves downward. When the hook boss 312 is embedded in the arc section 322, the end of the locking member will not move no matter how the hook boss 312 slides along the arc section 322, so that the locking member is kept in the state of exiting the locking groove 21.

[0058] In order to ensure that the first limiting member 31 will not move laterally, the first limiting member 31 is provided with a moving limiting groove 313, and the first connecting member 1 is provided with a locking limiting member accommodating cavity 15, and the side wall of the locking limiting member accommodating cavity 15 is provided with a moving limiting boss 11. After the first limiting member 31 is embedded in the locking limiting member accommodating cavity 15, the moving limiting boss 11 is embedded in the moving limiting groove 313, and the first limiting member 31 can move along the extension direction of the moving limiting boss 11. The side wall of the locking limiting member accommodating cavity 15 and the moving limiting boss 11 can prevent the first limiting member 31 from moving laterally, and only keep one direction (the extension direction of the moving limiting boss 11) of sliding freedom.

[0059] On the basis of the above structure, as shown in Figure 13 The locking member includes a locking tongue 41, a sliding block 42 and a reset elastic member 43, the locking tongue 41 and the sliding block 42 are fixedly connected, and the reset elastic member 43 has a tendency to move the locking tongue 41 and the sliding block 42 toward the locking groove 21. As shown in Figure 8 、 Figure 9 and Figure 13 The first connecting member 1 is provided with a locking tongue passing hole 14, after installation, the sliding block 42 and the reset elastic member 43 are located in the locking limiting member accommodating cavity 15, the locking tongue 41 is embedded in the locking tongue passing hole 14 and can move along the extension direction of the locking tongue passing hole 14. The end of the locking tongue 41 can be embedded in the locking groove 21 only after the end of the locking tongue 41 extends out of the locking tongue passing hole 14, so as to realize locking; the locking tongue 41 is completely out of the locking groove 21, so as to realize unlocking.

[0060] The slider 42 moves synchronously with the locking tongue 41. In order to prevent the slider 42 from deviating from its movement path, a limiting step 424 is provided on the top surface of the slider 42. A slider limiting surface 17 is provided in the locking limiting member receiving cavity 15. The limiting step 424 abuts against the slider limiting surface 17, so that the slider 42 can move horizontally in a straight line and cannot move upward.

[0061] like Figures 2 to 4 ,as well as Figure 10 and Figure 11 As shown, pressing the first limiting member 31 causes the locking tongue 41 and the slider 42 to retract. At this time, the base plate 100 of the children's high chair and the first connecting member 1 can rotate around the axis to achieve flip-folding. The specific method by which the first limiting member 31 drives the slider 42 to retract is not limited. In this embodiment, the first limiting member body 311 of the first limiting member 31 has an unlocking limiting slope 314, and the slider 42 has a slider limiting slope 421 that cooperates with the unlocking limiting slope 314. When unlocking, the first limiting member 31 moves upward, and the unlocking limiting slope 314 moves upward synchronously. The slider 42 cannot follow the first limiting member 31 to move upward due to the obstruction of the slider limiting surface 17. The unlocking limiting slope 314 pushes the slider 42 to move away from the locking groove 21 through the slider limiting slope 421. The structure is simple and reasonable, the friction between the unlocking limiting slope 314 and the slider limiting slope 421 is small, and the first limiting member 31 can more easily drive the slider 42 to retract.

[0062] The slider 42 and the locking tongue 41 can be an integral structure, but in order to make it easier to install into the locking limit member receiving cavity 15, the slider 42 and the locking tongue 41 are preferably separate structures.

[0063] The specific connection structure between the slider 42 and the latch 41 is not limited, as long as a stable connection between the slider 42 and the latch 41 can be achieved. In this embodiment, the slider 42 is provided with a through groove 422 and a latch connecting groove 423, and a set angle is formed between the extending directions of the through groove 422 and the latch connecting groove 423. During assembly, the slider 42 and the reset elastic member 43 are first placed into the locking limit member receiving cavity 15, and then the latch 41 is inserted into the latch through hole 14 from the outside until the latch 41 is partially inserted into the through groove 422, and the pin 44 is inserted into the through groove 422 from the side. A through hole (not shown) is provided on the latch 41 at the position corresponding to the through groove 422. After the pin 44 is inserted into the through groove 422 and the through hole on the latch 41, the slider 42 and the latch 41 are fixed together.

[0064] The specific structure of the first connector 1 is not limited; in this embodiment, for example... Figures 6 to 8 As shown, the first connecting member 1 includes a horizontal tube 12 and a rotating block 13 that are fixedly connected. The rotating block 13 can rotate around the axis of the horizontal tube 12, thereby realizing the bottom surface 100 of the children's high chair (as shown). Figures 2 to 4 (as shown) flip.

[0065] On the basis of the above structure, the second connecting piece 2 is provided with a plug-in part 22 plugged with the cross pipe 12, the plug-in part 22 is provided with a plug-in locking hole 23, the cross pipe 12 is provided with a through hole (not shown). The plug-in locking piece 24 is partially arranged in the plug-in locking hole 23 and the through hole of the cross pipe 12, and the tail end of the plug-in locking piece 24 protrudes from the cross pipe 12.

[0066] The rotating block 13 is provided with a limiting long hole 131, when the rotating block 13 rotates around the axis of the cross pipe 12, the tail end of the plug-in locking piece 24 can move along the extension direction of the limiting long hole 131. The length of the limiting long hole 131 is greater than the diameter of the plug-in locking piece 24, and the width of the limiting long hole 131 is equal to or slightly greater than the diameter of the plug-in locking piece 24, so as to allow the tail end of the plug-in locking piece 24 to move along the limiting long hole 131. The specific shape of the limiting long hole 131 is not limited, which can be but is not limited to a rectangle or an arc.

[0067] The first connecting piece 1 swings, when the plug-in locking piece 24 abuts against one end of the limiting long hole 131, the connecting structure is in a locked position; when the plug-in locking piece 24 abuts against the other end of the limiting long hole 131, the connecting structure is in an unlocked position. As shown in Figures 14 to 16 As shown in the locked state, the lock tongue 41 is arranged in the locking groove 21. As shown in Figures 17 to 21 As shown in the unlocked state, the slider 42 retreats with the lock tongue 41, the lock tongue 41 is separated from the locking groove 21, and at this time the rotating block 13 can rotate around the axis of the cross pipe 12. As shown in Figures 22 to 24 As shown in the rotating state, the hook protrusion 312 is embedded in the arc-shaped section 322. The arc-shaped section 322 prevents the hook protrusion 312 from moving downward without affecting the rotation of the rotating block 13, so the hook protrusion 312 cannot be reset, and the unlocking limiting inclined surface 314 and the slider limiting inclined surface 421 abut against each other, thereby preventing the slider 42 from moving outward under the pushing of the reset elastic member 43.

[0068] When the bottom plate surface 100 changes from the folded state to the use state, the hook protrusion 312 is embedded in the straight section 321 after being separated from the arc-shaped section 322, the slider 42 moves outward (moves in the direction of the locking groove 21) under the pushing of the reset elastic member 43, the unlocking limiting inclined surface 314 and the slider limiting inclined surface 421 abut against each other, and the slider 42 will push the first limiting piece 31 to move downward in the process of moving outward, the hook protrusion 312 slides downward along the straight section 321, until the lock tongue 41 is inserted into the locking groove 21, so that the rotating block 13 cannot rotate around the axis of the cross pipe 12, and it can be used safely.

[0069] When the bottom plate surface 100 is converted from the use state to the folding state, the first limiting piece 31 is pressed to move upward along the moving limiting boss 11, the limiting inclined surface 314 and the sliding block limiting inclined surface 421 are in abutment, the first limiting piece 31 moves upward, and the sliding block 42 is pushed to retreat (moves in the direction of the compression reset elastic piece 43) in the process, the lock tongue 41 retreats synchronously with the sliding block 42, and the lock tongue 41 is completely separated from the locking groove 21 until the lock tongue 41 is completely separated from the locking groove 21. In the process of the first limiting piece 31 moving upward, the pull hook boss 312 moves upward along the straight section 321 until the pull hook boss 312 reaches the top of the straight section 321 and enters the arc section 322. The arc section 322 can prevent the first limiting piece 31 from moving downward, the sliding block 42 and the lock tongue 41 cannot move outward, and the lock tongue 41 is always in the retreat unlocking state. When the tail end of the plug-in locking piece 24 abuts against the end of the limiting long hole 131, the rotating block 13 stops rotating around the axis of the horizontal pipe 12.

[0070] It should be noted that the above are only preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, readjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A connection structure, characterized by, The utility model relates to a connecting structure of a first connecting piece, a second connecting piece, a locking assembly, a limiting assembly and a locking piece, and the connecting structure is characterized in that the first connecting piece and the second connecting piece are movably connected, the locking assembly is used for fixing the first connecting piece and the second connecting piece relative when the locking assembly is in a locking position, the first connecting piece and the second connecting piece can rotate relative when the locking assembly is in an unlocking position, and the limiting assembly is used for enabling the locking assembly to be in the unlocking position continuously and comprises a first limiting piece and a second limiting piece. The locking assembly comprises a locking piece and a locking groove, the locking piece is arranged on one of the first connecting piece and the second connecting piece, the locking groove is arranged on the other one of the first connecting piece and the second connecting piece, the connecting structure is in the locking position when the locking piece is at least partially inserted into the locking groove, and the connecting structure is in the unlocking position when the locking piece is completely out of the locking groove. The limiting assembly can enable the locking piece to be in the state of being out of the locking groove continuously when the connecting structure is in the unlocking position. The first limiting piece comprises a first limiting piece main body and a hook convex platform connected with each other, the second limiting piece is provided with a straight section and an arc section connected with each other, the hook convex platform can be embedded into and moved along the straight section and the arc section, and the limiting assembly enables the locking piece to be in the state of being out of the locking groove continuously when the hook convex platform is embedded into the arc section. The first limiting piece is provided with a moving limiting groove, the connecting structure is provided with a moving limiting convex platform, the moving limiting convex platform is embedded into the moving limiting groove, and the first limiting piece can move along the extension direction of the moving limiting convex platform. The locking piece comprises a lock tongue, a sliding block and a reset elastic piece, the lock tongue and the sliding block are fixedly connected, and the reset elastic piece has a tendency of moving the lock tongue and the sliding block towards the locking groove. The first limiting piece comprises a first limiting piece main body, the first limiting piece main body is formed with an unlocking limiting inclined surface, the sliding block is formed with a sliding block limiting inclined surface matched with the unlocking limiting inclined surface, and the first limiting piece pushes the sliding block to move away from the locking groove when unlocking.

2. The connection structure according to claim 1, characterized by The sliding block is formed with a penetrating groove and a lock tongue connecting groove, the lock tongue is partially penetrated into the penetrating groove, and a set angle is formed between the extension directions of the penetrating groove and the lock tongue connecting groove. The first connecting piece comprises a horizontal pipe and a rotating block fixedly connected, and the rotating block can rotate around the axis line of the horizontal pipe.

3. The connection structure according to claim 2, characterized in that The second connecting piece is provided with a plug-in part plugged with the horizontal pipe, the plug-in part is formed with a plug-in locking hole, a plug-in locking piece is partially penetrated into the plug-in locking hole, the rotating block is formed with a limiting long hole, and the plug-in locking piece can relatively move along the extension direction of the limiting long hole when the rotating block rotates around the axis line of the horizontal pipe.

4. The connection structure according to claim 3, characterized in that ​ 5. The connection structure according to claim 2, wherein ​ 6. The connection structure according to claim 5, wherein ​ 7. The connection structure according to claim 5, wherein ​ 8. The connection structure according to any one of claims 1 to 7, characterized in that, ​ 9. The connection structure according to claim 8, characterized in that ​ When the plug-in locking member abuts against one end of the limiting long hole, the connecting structure is in a locked position; when the plug-in locking member abuts against the other end of the limiting long hole, the connecting structure is in an unlocked position.

10. A child's dining chair characterised in that, The connecting structure comprises a first connecting member and a second connecting member, and the first connecting member and the second connecting member are connected to each other through the connecting structure.

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