CN217408332U - Unfolding and folding device and child game bed - Google Patents

Abstract

The utility model relates to a children's recreation bed technical field discloses an expand to close and receive device and children's recreation bed, should expand to close the device and have the expansion state and close the state of closing, and can open the state and close and switch between the state, and the device includes: a first upright and a second upright; the connecting rod mechanism is arranged between the first upright post and the second upright post, and comprises a locking part arranged on a vertical connecting rod of a vertical connecting rod; the locking mechanism is arranged on the vertical connecting rod and comprises a locking piece; when the unfolding and folding device is switched to the unfolding state from the folding state, the first stand column and the second stand column are both outwards far away from the vertical connecting rod, and the locking piece is locked on the locking part so as to lock the unfolding and folding device in the unfolding state; when the unfolding and folding device is switched to be in a folding state from the unfolding state, the locking piece is unlocked from the locking part, and the first stand column and the second stand column are both inwards closed towards the vertical connecting rod. The utility model has the advantages of, this expansion closing device's receipts are closed, are expanded conveniently, and the structural stability after expanding is high.

Description

Unfolding and folding device and child game bed

Technical Field

The utility model relates to a children's recreation bed technical field especially relates to an expand to receive closing device and children's recreation bed.

Background

The child game bed is a special bed for safe activities of infants, and mainly comprises a support bottom and side walls arranged around the support bottom, wherein the support bottom and the surrounding side walls surround a safe game space, and the infants can move in the safe game space.

The integral game bed occupies a large space when not in use, and when the integral game bed needs to be folded, all joints need to be gradually disassembled; when the joint needs to be used next time, all joints need to be assembled again, and the joint is inconvenient to disassemble and assemble. Therefore, foldable play beds are available in the market, the unfolding and folding device is a core mechanism for realizing the folding and unfolding of the play bed, and the existing unfolding and folding device of the play bed still has the problems of folding trouble in the using process and poor stability after being unfolded.

SUMMERY OF THE UTILITY MODEL

The above-mentioned not enough to prior art exists, the utility model aims to solve the technical problem lie in that, provide one kind to receive to close, expand the convenience, and expand that back stability is high expansion receipts and close device and children's recreation bed.

The technical solution adopted by the present invention is to provide an unfolding and folding device, which has an unfolding state and a folding state, and can be switched between the unfolding state and the folding state; the unfolding and folding device comprises:

the first upright column and the second upright column are arranged at intervals;

the connecting rod mechanism is arranged between the first stand column and the second stand column, comprises a vertical connecting rod, and is provided with a locking part;

the locking mechanism is arranged on the vertical connecting rod and comprises a locking piece;

when the unfolding and folding device is switched from the folding state to the unfolding state, the first stand column and the second stand column are both away from the vertical connecting rod outwards, and the locking piece is locked on the locking part so as to lock the unfolding and folding device in the unfolding state; when the unfolding and folding device is switched from the unfolding state to the folding state, the locking piece is unlocked from the locking part, and the first stand column and the second stand column are both inwards closed towards the vertical connecting rod.

Furthermore, an upper connecting structure and a lower connecting structure are respectively arranged on the vertical connecting rod;

the connecting rod mechanism further comprises a first upper connecting rod, a second upper connecting rod, a first lower connecting rod and a second lower connecting rod, wherein one ends of the first upper connecting rod and the first lower connecting rod are hinged to the first upright post, and the other ends of the first upper connecting rod and the first lower connecting rod are respectively hinged to the upper connecting structure and the lower connecting structure; one ends of the second upper connecting rod and the second lower connecting rod are hinged to the second upright post, and the other ends of the second upper connecting rod and the second lower connecting rod are hinged to the upper connecting structure and the lower connecting structure respectively.

Furthermore, the upper connecting structure and the lower connecting structure are respectively an upper hinge seat and a lower hinge seat which are fixedly connected to the upper end and the lower end of the vertical connecting rod; the first upper connecting rod and the second upper connecting rod are respectively hinged at two ends of the upper hinge seat, and the first lower connecting rod and the second lower connecting rod are respectively hinged at two ends of the lower hinge seat;

when the unfolding and folding device is in the unfolding state, the first upper connecting rod and the second upper connecting rod are horizontally arranged, and the first lower connecting rod and the second lower connecting rod are horizontally arranged; when the unfolding and folding device is in the folding state, the first upper connecting rod, the second upper connecting rod, the first lower connecting rod and the second lower connecting rod are vertically arranged.

Furthermore, the locking mechanism further comprises a sliding seat which is arranged on the vertical connecting rod in a lifting and sliding manner, and the locking piece is movably arranged in the sliding seat.

The sliding seat further comprises a first support rod and a second support rod, one end of the first support rod is hinged to the first upper connecting rod, and the other end of the first support rod is hinged to the sliding seat; one end of the second support rod is hinged to the second upper connecting rod, and the other end of the second support rod is hinged to the sliding seat;

when the unfolding and folding device is in the unfolding state, the first support rod, the first upper connecting rod and the vertical connecting rod enclose a first right triangle, and the second support rod, the second upper connecting rod and the vertical connecting rod enclose a second right triangle.

Furthermore, the locking piece comprises a locking seat and a locking pin fixedly connected with the locking seat, and the locking part is a locking hole formed in the vertical connecting rod;

when the unfolding and folding device is in the unfolding state, the lock pin is locked in the lock position hole.

Furthermore, the locking mechanism further comprises an unlocking key which is arranged on the sliding seat, a first inclined wall is arranged on the locking seat, a second inclined wall is arranged on the unlocking key, and the second inclined wall is movably attached to the first inclined wall;

the unlocking button can drive the lock pin to be disengaged from the lock position hole.

Furthermore, the sliding seat comprises a bottom shell and a face shell fixedly connected with the bottom shell, and the locking piece and the unlocking key are arranged between the bottom shell and the face shell;

a spring is further arranged on the locking piece, one end of the spring abuts against the locking piece, and the other end of the spring abuts against the face shell; the bottom shell is provided with a through groove, and the vertical connecting rod penetrates through the through groove.

Further, the lengths of the first upright post and the second upright post are the same;

the sum of the lengths of the first upper connecting rod and the first lower connecting rod is smaller than the length of the first upright post, and the sum of the lengths of the second upper connecting rod and the second lower connecting rod is smaller than the length of the second upright post.

The technical proposal of the utility model for solving the technical problem is that a children game bed is also provided, which comprises:

the two groups of unfolding and folding devices are connected with each other.

Compared with the prior art, the utility model discloses following beneficial effect has at least:

the utility model discloses in, connect through link mechanism between first stand and the second stand, when needs will expand to receive the device expansion, outwards draw first stand and second stand, make first stand and second stand outwards expand for vertical connecting rod, reach the farthest distance between first stand and the second stand, the state expandes completely promptly, locking mechanism on the vertical connecting rod this moment is with whole device locking, under the condition of not with the locking mechanism unblock, whole device remains the expansion state all the time, guarantee to expand the structural stability in the use. When need not use or pack the transportation, press the unblock button, with the locking mechanical system unblock, the slide can slide along vertical connecting rod, inwards push away first stand and second stand, make first stand and second stand inwards receive for vertical connecting rod and close, make the volume that expandes to receive the device greatly reduce, and the space that occupies is little, makes things convenient for packing, transportation and accomodates. The whole unfolding and folding process of the unfolding and folding device is very simple and convenient, any part does not need to be disassembled and assembled, the unfolding and folding efficiency is high, the structural stability after the unfolding is high, and the occupied space after the folding is small.

In the utility model, the first upright post and the first upper connecting rod, the first lower connecting rod and the vertical connecting rod in the connecting rod mechanism form a plane four-bar mechanism, and the second upright post and the second upper connecting rod, the second lower connecting rod and the vertical connecting rod in the connecting rod mechanism form another plane four-bar mechanism, so that the device can be easily deformed and folded under the condition that the device is not locked; the device expandes completely, after the locking, connecting rod is the level setting on first last connecting rod and the second, connecting rod also is the level setting under first lower connecting rod and the second, the pin joint of the above-mentioned a set of connecting rod is in on the same water flat line promptly, the pin joint of the following a set of connecting rod also is in on the same water flat line, all be in the dead point position, and simultaneously, first vaulting pole and second vaulting pole strut are propped open, the lockpin locking in the locking position hole among the locking mechanism, guarantee that first vaulting pole and second vaulting pole can not fold up, first vaulting pole and second vaulting pole and first last connecting rod, connecting rod and vertical connecting rod become two right angled triangle bearing structure on the second, structural stability is high, the condition that the mistake was closed can not take place.

Drawings

Fig. 1 is a schematic structural view of the unfolding and folding device of the present invention in an unfolded state;

FIG. 2 is an exploded view of FIG. 1;

fig. 3 is a half-sectional view of the unfolding and folding device along the vertical connecting rod;

FIG. 4 is a schematic view of the slide seat upper chute;

fig. 5 is a force application diagram of the unfolding and folding device when folded;

fig. 6 is a schematic view of the unfolding and folding device during the folding process (half-unfolded state);

fig. 7 is a schematic structural view of the unfolding and folding device in a folded state;

fig. 8 is a schematic structural view of the children game bed.

In the figure:

1. a first upright post;

2. a second upright post;

3. a link mechanism; 30. a vertical connecting rod; 301. a lock section; 302. an upper connecting structure; 303. a lower connecting structure; 31. a first upper link; 32. a second upper link; 33. a first lower link; 34. a second lower link;

4. a locking mechanism; 40. a locking member; 401. a lock seat; 401A, a first inclined wall; 402. a lock pin; 41. a slide base; 410. a bottom case; 410A, a through groove; 411. a face shell; 42. an unlocking key; 420. a second inclined wall; 43. a spring;

5. a first stay bar;

6. a second brace bar.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

It should be noted that all the directional indicators (such as upper, lower, left, right, front, rear … …) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

Furthermore, the descriptions in the present application as to "first," "second," "a," etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating a number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present application, unless expressly stated or limited otherwise, the terms "connected" and "secured" are to be construed broadly, and thus, for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In addition, the technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are contradictory or cannot be realized, the combination of such technical solutions should be considered to be absent, and is not within the protection scope of the present invention.

The first embodiment is as follows:

as shown in fig. 1 to 7, an unfolding and folding device has an unfolding state (shown in fig. 1 and 5) and a folding state (shown in fig. 7), and the unfolding and folding device can be switched between the unfolding state and the folding state, and the unfolding and folding device includes: the device comprises a first upright 1, a second upright 2, a link mechanism 3, a locking mechanism 4, a first support rod 5 and a second support rod 6.

First stand 1 and the second stand 2 that the interval set up, first stand 1 and second stand 2 are two supporting legss of children's recreation bed in the use of reality, and whole children's recreation bed includes two first stands 1 and two second stands 2, is four supporting legss of children's recreation bed promptly. Wherein, first stand 1 and second stand 2 are split type setting, including stand pipe (do not mark in the picture), set up at stand socle, stand side tube, go up joint and articulated seat of stand pipe bottom, split type stand mainly makes things convenient for the equipment after the shaping, adopts the inconvenient shaping of stand of integral type.

As shown in fig. 1-2, the link mechanism 3 is disposed between the first column 1 and the second column 2, and includes a vertical link 30, and the vertical link 30 has a locking portion 301 thereon. Specifically, an upper connecting structure 302 and a lower connecting structure 303 are respectively arranged on the vertical connecting rod 30; in this embodiment, the upper connecting structure 302 and the lower connecting structure 303 are respectively an upper hinged seat and a lower hinged seat fixedly connected to the upper end and the lower end of the vertical connecting rod 30, and the specific fixed connection manner may be a bolt or a screw connection, so as to facilitate the disassembly and assembly. The link mechanism 3 further includes a first upper link 31, a second upper link 32, a first lower link 33 and a second lower link 34, wherein one end of each of the first upper link 31 and the first lower link 33 is hinged to the first upright 1, and the other end of each of the first upper link 31 and the first lower link 33 is hinged to the upper connecting structure 302 and the lower connecting structure 303 respectively; one ends of the second upper connecting rod 32 and the second lower connecting rod 34 are both hinged on the second upright 2, and the other ends of the second upper connecting rod 32 and the second lower connecting rod 34 are respectively hinged on the upper connecting structure 302 and the lower connecting structure 303.

In an actual using process, the first upright 1, the first upper connecting rod 31, the first lower connecting rod 33 and the vertical connecting rod 30 in the connecting rod mechanism 3 form a planar four-bar mechanism, the second upright 2, the second upper connecting rod 32, the second lower connecting rod 34 and the vertical connecting rod 30 in the connecting rod mechanism 3 form another planar four-bar mechanism, and under the condition that the device is not locked, the device is simple in deformation, namely, the device is simple in folding.

The upper and lower ends of the vertical connecting rod 30 are respectively provided with an upper hinge seat and a lower hinge seat, instead of directly adopting a pin connection mode, when the unfolding and folding device is folded, the first upper connecting rod 31, the second upper connecting rod 32, the first lower connecting rod 33 and the second lower connecting rod 34 are basically in a vertical state (namely vertical to the horizontal direction), the folding rate of the whole device is improved, and the first upper connecting rod 31, the second upper connecting rod 32, the first lower connecting rod 33 and the second lower connecting rod 34 can be manufactured into straight rods, so that bent joints do not need to be manufactured on the four parts. Specifically, the first upper connecting rod 31 and the second upper connecting rod 32 are respectively hinged at two ends of the upper hinged seat, and the first lower connecting rod 33 and the second lower connecting rod 34 are respectively hinged at two ends of the lower hinged seat. When the unfolding and folding device is in the unfolding state, the first upper connecting rod 31 and the second upper connecting rod 32 are horizontally arranged, and the first lower connecting rod 33 and the second lower connecting rod 34 are both horizontally arranged.

In the actual use process, after the unfolding and folding device is completely unfolded and locked, the first upper connecting rod 31 and the second upper connecting rod 32 are horizontally arranged, the first lower connecting rod 33 and the second lower connecting rod 34 are also horizontally arranged, that is, the hinge points of the upper group of connecting rods are on the same horizontal line, the hinge points of the lower group of connecting rods are also on the same horizontal line and are both in dead point positions, the device cannot be folded by the force in the horizontal direction, namely, the device is in a dead point locking state, the device can be folded only by the force in the vertical direction, and when the unfolding and folding device is in the completely unfolded state, the locking piece 40 is locked in the locking hole, the movement in the vertical direction is locked, that is, the device cannot be folded under the condition that the device is not unlocked, the structural stability during unfolding is ensured, and the folding is prevented from being mistakenly folded. When the unfolding and folding device is in the folding state, the first upper connecting rod 31, the second upper connecting rod 32, the first lower connecting rod 33 and the second lower connecting rod 34 are vertically arranged, so that the folding rate of the unfolding and folding device is improved to the greatest extent, the occupied space is reduced, and the packaging and transportation cost can be reduced.

Preferably, as shown in fig. 5-7, the lengths of the first upright 1 and the second upright 2 in the present embodiment are the same; the sum of the lengths of the first upper link 31 and the first lower link 33 is smaller than the length of the first upright 1, and the sum of the lengths of the second upper link 32 and the second lower link 34 is smaller than the length of the second upright 2. Specifically, the four first upper link 31, the second upper link 32, the first lower link 33, and the second lower link 34 are equal in length and are each shorter than half of the first column 1. The benefits of this length relationship setting are explained below: in two hinged positions on the first upright 1 and the second upright 2, one is at the top, and one is at the middle part, in the folding process of the device, the first upper connecting rod 31, the second upper connecting rod 32, the first lower connecting rod 33 and the second lower connecting rod 34 both rotate downwards relative to the first upright 1 or the second upright 2, after the device is completely folded, the sum of the lengths of the two connecting rods is shorter than that of the first upright 1 and the second upright 2, so that after the device is folded, the first lower connecting rod 33 and the second lower connecting rod 34 cannot protrude downwards below the first upright 1 and the second upright 2, namely, in the folding process, the first upright 1 and the second upright 2 can always stand on the ground, and the deformation of the connecting rod mechanism 3 is always in the space enclosed by the first upright 1 and the second upright 2.

As shown in fig. 5-7, a specific folding process of the unfolding and folding device is shown, whereas the unfolding process is opposite to the folding process, and F is a force application direction. The locking mechanism 4 is arranged on the vertical connecting rod 30 and comprises a locking piece 40, when the unfolding and folding device is switched from the folding state to the unfolding state, the first stand column 1 and the second stand column 2 are both away from the vertical connecting rod 30, and the locking piece 40 is locked at the locking part 301 to lock the unfolding and folding device in the unfolding state; when the unfolding and folding device is switched to the folding state from the unfolding state, the locking piece 40 is unlocked from the locking part 301, and the first upright 1 and the second upright 2 are both drawn together inwards towards the vertical connecting rod 30.

As shown in fig. 1, 3, and 4, the lock mechanism 4 of the present embodiment is most preferable but not limited to this structure, and for example, it may simplify the structure of the lock mechanism 4 as long as it can prevent the upper and lower four links from not being unlocked from the dead point position in the expanded state. The most preferred locking mechanism 4 of the present embodiment is described in detail below: the locking mechanism 4 further comprises a sliding seat 41, an unlocking button 42 and a spring 43, the sliding seat 41 is arranged on the vertical connecting rod 30 in a lifting and sliding manner, and the locking piece 40 is movably arranged in the sliding seat 41.

The locking member 40 includes a lock base 401 and a lock pin 402 fixedly connected to the lock base 401, and the locking portion 301 is a locking hole (i.e., a locking portion 301) formed in the vertical link 30; when the unfolding and folding device is in the unfolding state, the lock pin 402 is locked in the lock position hole.

The sliding base 41 comprises a bottom shell 410 and a face shell 411 fixedly connected with the bottom shell 410, the sliding base 41 is arranged into a front half and a rear half so as to be convenient for installing other components, and the locking piece 40 and the unlocking key 42 are arranged between the bottom shell 410 and the face shell 411.

One end of the spring 43 abuts against the locking member 40, and the other end of the spring 43 abuts against the face shell 411; a through groove 410A is formed in the bottom case 410, and the vertical connecting rod 30 is inserted into the through groove 410A. In the manual operation state, the spring 43 has a pushing force against the locking member 40, the pushing force is provided by an elastic force, when the lock pin 402 on the locking member 40 is aligned with the lock position hole, the lock pin 402 is locked in the lock position hole under the action of the pushing force of the spring 43, and after the lock pin 402 is locked in the lock position hole, the spring 43 can prevent the lock pin 402 from being separated from the lock position hole.

The unlocking key 42 is arranged on the sliding seat 41, a first inclined wall 401A is arranged on the lock seat 401, a second inclined wall 420 is arranged on the unlocking key 42, and the second inclined wall 420 is movably attached to the first inclined wall 401A; the unlock button 42 may actuate the locking pin 402 to disengage from the capture aperture. In the using process, the unlocking button 42 is pressed upwards, the second inclined wall 420 of the unlocking button 42 presses the first inclined wall 401A on the lock seat 401, the lock seat 401 moves to the side far away from the lock position hole, the lock pin 402 is pulled out of the lock position hole and unlocked, and meanwhile, the spring 43 is further compressed. After releasing the unlocking button 42, the lock seat 401 is reset under the action of the spring 43, so that the unlocking button 42 is driven to reset.

Preferably, as shown in fig. 1 and 5, the unfolding and folding device further includes a first stay bar 5 and a second stay bar 6, wherein one end of the first stay bar 5 is hinged to the first upper link 31, and the other end of the first stay bar 5 is hinged to the sliding base 41; one end of the second stay bar 6 is hinged on the second upper connecting rod 32, and the other end of the second stay bar 6 is hinged on the sliding seat 41; when the unfolding and folding device is in the unfolding state, the first stay bar 5, the first upper connecting rod 31 and the vertical connecting rod 30 enclose a first right triangle, and the second stay bar 6, the second upper connecting rod 32 and the vertical connecting rod 30 enclose a second right triangle. When the device is in a completely unfolded state, the locking mechanism 4 is locked, the four connecting rods are in four-point positions, meanwhile, the first support rod 5 and the second support rod 6 are opened, the lock pin 402 in the locking mechanism 4 is locked in the locking hole, it is guaranteed that the first support rod 5 and the second support rod 6 cannot be folded, the first support rod 5 and the second support rod 6, the first upper connecting rod 31, the second upper connecting rod 32 and the vertical connecting rod 30 form a double right-angled triangle supporting structure, the structural stability is high, and the condition of mistaken folding cannot occur.

In a whole, in the unfolding and folding device, the first stand column 1 and the second stand column 2 are connected through the link mechanism 3, when the unfolding and folding device is required to be unfolded, the first stand column 1 and the second stand column 2 are pulled outwards, so that the first stand column 1 and the second stand column 2 are unfolded outwards relative to the vertical connecting rod 30, the farthest distance is achieved between the first stand column 1 and the second stand column 2, namely, the complete unfolding state is achieved, the locking mechanism 4 on the vertical connecting rod 30 locks the whole device, under the condition that the locking mechanism 4 is not unlocked, the whole device is always kept in the unfolding state, and the structural stability in the unfolding and using process is ensured. When the folding device is not used or packaged and transported, the unlocking key 42 is pressed to unlock the locking mechanism 4, the sliding seat 41 can slide along the vertical connecting rod 30 and inwards push the first stand column 1 and the second stand column 2, so that the first stand column 1 and the second stand column 2 are inwards folded relative to the vertical connecting rod 30, the size of the unfolding folding device is greatly reduced, the occupied space is small, and the folding device is convenient to package, transport and store. The whole unfolding and folding process of the unfolding and folding device is very simple and convenient, any part does not need to be disassembled and assembled, the unfolding and folding efficiency is high, the structural stability after the unfolding is high, the occupied space after the folding is small, and the vertical connecting rod 30 is always in a vertical state in the unfolding and folding processes.

Example two:

as shown in fig. 8, a children's play yard comprises: the two unfolding and folding devices in the first embodiment are connected with each other. Specifically, the two sets of unfolding and folding devices can be connected in a manner of being not limited to being conveniently folded, so that the children game bed can be folded transversely and also can be folded longitudinally.

In the scheme, the unfolding and folding device and the child game bed are convenient to fold and unfold, and the unfolded structure is high in stability.

Claims (10)

1. An unfolding and folding device which has an unfolding state and a folding state and can be switched between the unfolding state and the folding state, and is characterized by comprising:

the first upright column and the second upright column are arranged at intervals;

the connecting rod mechanism is arranged between the first stand column and the second stand column, comprises a vertical connecting rod, and is provided with a locking part;

the locking mechanism is arranged on the vertical connecting rod and comprises a locking piece;

when the unfolding and folding device is switched from the folding state to the unfolding state, the first stand column and the second stand column are both away from the vertical connecting rod outwards, and the locking piece is locked on the locking part so as to lock the unfolding and folding device in the unfolding state; when the unfolding and folding device is switched from the unfolding state to the folding state, the locking piece is unlocked from the locking part, and the first stand column and the second stand column are both inwards closed towards the vertical connecting rod.

2. The unfolding and folding device according to claim 1, wherein said vertical connecting rods are respectively provided with an upper connecting structure and a lower connecting structure;

the connecting rod mechanism further comprises a first upper connecting rod, a second upper connecting rod, a first lower connecting rod and a second lower connecting rod, wherein one ends of the first upper connecting rod and the first lower connecting rod are hinged to the first upright post, and the other ends of the first upper connecting rod and the first lower connecting rod are respectively hinged to the upper connecting structure and the lower connecting structure; one ends of the second upper connecting rod and the second lower connecting rod are hinged to the second upright post, and the other ends of the second upper connecting rod and the second lower connecting rod are hinged to the upper connecting structure and the lower connecting structure respectively.

3. The unfolding and folding device according to claim 2, wherein said upper connecting structure and said lower connecting structure are respectively an upper hinge seat and a lower hinge seat fixedly connected to the upper and lower ends of said vertical connecting rod; the first upper connecting rod and the second upper connecting rod are respectively hinged at two ends of the upper hinge seat, and the first lower connecting rod and the second lower connecting rod are respectively hinged at two ends of the lower hinge seat;

when the unfolding and folding device is in the unfolding state, the first upper connecting rod and the second upper connecting rod are horizontally arranged, and the first lower connecting rod and the second lower connecting rod are horizontally arranged; when the unfolding and folding device is in the folding state, the first upper connecting rod, the second upper connecting rod, the first lower connecting rod and the second lower connecting rod are vertically arranged.

4. A folding and unfolding apparatus according to any one of claims 2 or 3, wherein said locking mechanism further comprises a sliding base slidably disposed on said vertical link in a lifting manner, and said locking member is movably disposed in said sliding base.

5. The unfolding and folding device according to claim 4, further comprising a first stay and a second stay, wherein one end of said first stay is hinged to said first upper link, and the other end of said first stay is hinged to said slide; one end of the second support rod is hinged to the second upper connecting rod, and the other end of the second support rod is hinged to the sliding seat;

when the unfolding and folding device is in the unfolding state, the first support rod, the first upper connecting rod and the vertical connecting rod enclose a first right triangle, and the second support rod, the second upper connecting rod and the vertical connecting rod enclose a second right triangle.

6. The unfolding and folding device according to claim 4, wherein the locking member includes a locking seat and a locking pin fixedly connected to the locking seat, and the locking portion is a locking hole formed in the vertical connecting rod;

when the unfolding and folding device is in the unfolding state, the lock pin is locked in the lock position hole.

7. The unfolding and folding device according to claim 6, wherein said locking mechanism further comprises an unlocking button disposed on said sliding seat, said locking seat is provided with a first inclined wall, said unlocking button is provided with a second inclined wall, and said second inclined wall is movably attached to said first inclined wall;

the unlocking button can drive the lock pin to be disengaged from the lock position hole.

8. The unfolding and folding device according to claim 7, wherein said sliding base includes a bottom shell and a front shell fixedly connected to said bottom shell, and said locking member and said unlocking button are disposed between said bottom shell and said front shell;

a spring is further arranged on the locking piece, one end of the spring abuts against the locking piece, and the other end of the spring abuts against the face shell; a through groove is formed in the bottom shell, and the vertical connecting rod penetrates through the through groove.

9. The unfolding and folding device according to claim 2, wherein said first upright and said second upright are of the same length;

the sum of the lengths of the first upper connecting rod and the first lower connecting rod is smaller than the length of the first upright post, and the sum of the lengths of the second upper connecting rod and the second lower connecting rod is smaller than the length of the second upright post.

10. A children's play yard, comprising:

two collapsible devices according to any one of claims 1-9, wherein the two collapsible devices are connected to each other.

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