CN223275201U - Folding type device multifunctional baby crib - Google Patents

Abstract

The utility model belongs to the technical field of folding cribs, and particularly relates to a folding multifunctional crib. The foldable frame is lifted upwards to drag the four groups of frames to the middle to gather into a cylindrical structure, and meanwhile, each foldable fence is folded downwards and hidden on the inner side of the arc-shaped frame and is fastened and fixed through a top cover and a bottom cover. The folding structure of gathering is adopted, so that the crib can be folded into a columnar structure, the occupied space is greatly reduced, meanwhile, the switching of the structure is realized by adopting various rails and movable fasteners, the functionality of the crib is greatly improved, and the diversified requirements are met.

Description

Folding type device multifunctional baby crib

Technical Field

The utility model belongs to the technical field of folding cribs, and particularly relates to a folding multifunctional crib.

Background

The crib is a necessary object for family inoculation baby, at present, the guardrail of the crib is higher than the crib, the holding child needs to stand up, the movable guardrail is used for holding conveniently, but the two doors are opened and closed mostly, the lock is adopted, the lock is opened or locked to push the guardrail open during adjustment, the active child likes to play the lock or locked, and the potential safety hazard is formed by the unintentional opening of the lock. In addition, the double-door opening and closing type safety barrier is easy to operate, occupies a relatively large space, and is easy to move, so that potential safety hazards are caused.

In addition, the bedside crib can be connected with the adult bed by changing the structure of the crib into a fence, but because the structure of the crib is small and exquisite, the height of the crib cannot be kept consistent with that of the adult bed, and certain potential safety hazards exist in the overturning process due to the height difference.

Meanwhile, the traditional crib folding structure and design are unreasonable, and the adoption is all the stacked folding structure, so that the crib after folding still needs to occupy space, and is unfavorable for storage and carrying.

In view of the above, the present application provides a foldable multi-functional crib.

Disclosure of utility model

The folding type multifunctional baby crib is simple in structure, reasonable in design and convenient to use, adopts a gathering type folding structure, can enable the baby crib to be folded into a columnar structure, greatly reduces space occupation, and meanwhile, adopts various rails and movable fasteners to switch the structure, so that the functionality of the baby crib is greatly improved, and diversified requirements are met.

The foldable frame comprises a first quadrant arc-shaped enclosing frame, a second quadrant arc-shaped enclosing frame, a third quadrant arc-shaped enclosing frame, a fourth quadrant arc-shaped enclosing frame, a folding underframe, folding fences, a two-layer bedstead, a top cover and a bottom cover, wherein the bottoms of the first quadrant arc-shaped enclosing frame, the second quadrant arc-shaped enclosing frame, the third quadrant arc-shaped enclosing frame and the fourth quadrant arc-shaped enclosing frame are connected through the folding underframe, the inner sides of the upper ends of adjacent edges of the four groups of enclosing frames are connected with the folding fences, meanwhile, the middle of the four groups of enclosing frames is movably connected with the detachable and liftable two-layer bedstead, the folding underframe is lifted upwards to drag the first quadrant arc-shaped enclosing frame, the second quadrant arc-shaped enclosing frame, the third quadrant arc-shaped enclosing frame and the fourth quadrant arc-shaped enclosing frame to the middle to drag and gather to form a cylindrical structure, and meanwhile, the folding fences are folded downwards to be hidden inside the arc-shaped enclosing frames and are folded and fixed through buckling of the top cover and the bottom cover and the arc-shaped enclosing frames.

Preferably, the first quadrant arc-shaped enclosing frame and the second quadrant arc-shaped enclosing frame have the same structure, the first quadrant arc-shaped enclosing frame comprises a top angle, a bottom angle, column pipes, folding rod plug connectors, a bottom frame fixing seat, buckles, rollers, lifting rails, limiting jacks and lifting sliding blocks, two sides of the inner side of the upper end of the top angle are respectively connected with a pair of movable folding rod plug connectors, an integral bottom frame fixing seat is arranged in the middle of the inner side of the bottom angle, the two sides of the inner side of the bottom angle are provided with integral buckles, the rollers are inserted in the middle of the bottom angle, a plurality of column pipes are inserted between the top angle and the bottom angle, the middle column pipe is provided with a lifting rail, the inner wall of the lifting rail is provided with the limiting jacks, and the lifting sliding blocks are movably clamped in the lifting rail.

The lifting sliding block comprises a base, a splicing convex seat, track pulleys, positioning pin sheets, pull buckles, clamping grooves and fixing bolts, wherein the outer side of the base is provided with an integrated splicing convex seat, the upper end and the lower end of the splicing convex seat are respectively connected with a pair of track pulleys, the middle of the splicing convex seat is spliced with the positioning pin sheets with reset springs, the tail parts of the positioning pin sheets are connected with the pull buckles movably fastened at the upper end of the base through the fixing bolts to realize unlocking linkage of the positioning pin sheets, and the tail parts of the base are provided with the clamping grooves.

Preferably, the third-quadrant arc-shaped enclosing frame and the fourth-quadrant arc-shaped enclosing frame have the same structure, a second lifting rail and a rail lifting joint are added on the basis of the first-quadrant arc-shaped enclosing frame, a second lifting rail is arranged in the middle of a column tube on the side edge, and the rail lifting joint is movably clamped in the second lifting rail.

The rail lifting joint comprises an outer shell, a rail clamping seat, a driving sliding block, a finger pull buckle, a positioning pin shaft, a reset spring and a ladder slope, wherein the inner side of the front end of the outer shell is provided with the integrated rail clamping seat, the positioning pin shaft is inserted into the rail clamping seat through the reset spring, the driving sliding block is movably arranged in the outer shell, the front end of the driving sliding block is provided with the ladder slope, the ladder slope is attached to the tail part of the positioning pin shaft to realize telescopic jacking, and the tail part of the driving sliding block is connected with the finger pull buckle at the lower end of the tail part of the outer shell.

The folding underframe comprises a middle base pier seat, cross connecting rods, auxiliary connecting rods, connecting pieces, a folding pier seat, check blocks, rotating seats and handles, wherein the outer sides of the middle base pier seat are symmetrically connected with four groups of cross connecting rods through pin shafts, the check blocks are connected to the top ends of the second cross connecting rods and the fourth cross connecting rods of the four groups of cross connecting rods, the check blocks are clamped in reserved grooves in the middle of the middle base pier seat, the first quadrants and the third quadrants of the four groups of cross connecting rods are transversely connected with the auxiliary connecting rods through the connecting pieces, the middle of the auxiliary connecting rods are provided with the folding pier seat, the middle of the middle base pier seat is connected with the rotating seat through spring shafts, the handles are clamped in the middle of the rotating seat, and the outer sides of the rotating seat are provided with symmetrical meshing grooves which are kept meshed with tooth grooves on the inner sides of the end heads of the check blocks.

Preferably, the top ends of the cross connecting rods are connected with the first quadrant arc-shaped enclosing frame, the second quadrant arc-shaped enclosing frame, the third quadrant arc-shaped enclosing frame and the chassis fixing seat at the bottom of the fourth quadrant arc-shaped enclosing frame through pin shafts, so that the movable connection between the folding chassis and the four groups of arc-shaped enclosing frames is realized.

Preferably, the folding fence comprises a left connecting rod, a right connecting rod and a folding joint, wherein the left connecting rod and the right connecting rod are movably connected to the two sides of the folding joint through rivets, a pressing switch with a reset spring is movably clamped on the inner side of the lower end of the folding joint, a pair of linkage limiting rods are inserted into a guide chute in the middle of the pressing switch, and the pressing switch is used for shrinking the linkage limiting rods inwards to unlock the limiting of the ends of the left connecting rod and the right connecting rod through pressing.

Preferably, two ends of the folding fence are spliced in the folding rod splicing heads to form a fixed fence, and two ends of the folding fence are spliced in the fence lifting joints to form a liftable fence.

Preferably, the two-layer bedstead comprises a left bedstead and a right bedstead, wherein the left bedstead and the right bedstead are connected in a pin shaft inserting and matching mode, and four corners of the two-layer bedstead are connected with clamping grooves at the tail parts of the lifting sliding blocks through outward expanding support arms.

After the structure is adopted, the utility model has the beneficial effects that:

The folded structure is adopted, so that the volume after folding is greatly reduced, the occupied space is reduced, and the portability is improved.

The two-layer bedstead can be used for lifting and adjusting gears, and the two-layer bedstead can be matched with the mattress to enable the crib to be kept flush with the adult bed, so that the use safety is improved.

The mattress on the two-layer bed frame is replaced by a hard table plate, so that the traditional baby crib is changed into a child table, and the functional diversity is greatly improved to meet the living game requirement.

Drawings

For a clearer description of embodiments of the present utility model or technical solutions in the prior art, the present utility model is described in detail by the following detailed description and the accompanying drawings.

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic view of the folded state of the present utility model;

FIG. 3 is a second schematic view of the folded state of the present utility model;

Fig. 4 is a schematic structural view of a first quadrant arc enclosure 1 and a second quadrant arc enclosure 2 of the present utility model;

Fig. 5 is a schematic structural view of the lifting slider 19 according to the present utility model;

fig. 6 is a schematic diagram of the internal linkage structure of the lifting slider 19 according to the present utility model;

fig. 7 is a schematic structural view of a third quadrant arc enclosure 1 and a fourth quadrant arc enclosure 2 of the present utility model;

fig. 8 is a schematic view of the structure of the rail lifting joint 32 of the present utility model;

fig. 9 is a schematic view of the internal structure of the rail lift fitting 32 of the present utility model;

Fig. 10 is a cross-sectional view of the rail lift tab 32 of the present utility model;

fig. 11 is a schematic structural view of the folding chassis 5 of the present utility model;

fig. 12 is a schematic view of the middle pier seat 51 of the middle pier seat structure of the present utility model;

fig. 13 is a schematic view of the structure of the folding fence 6 of the present utility model;

Fig. 14 is a schematic structural view of a two-layer bed frame 7 according to the present utility model;

The reference numerals indicate that the first quadrant arc enclosure 1, the second quadrant arc enclosure 2, the third quadrant arc enclosure 3, the fourth quadrant arc enclosure 4, the folding chassis 5, the folding rail 6, the two-layer bed frame 7, the top cover 8, the bottom cover 9, the top corner 10, the bottom corner 11, the pillar 12, the folding bar plug 13, the chassis fixing seat 14, the buckle 15, the roller 16, the lifting rail 17, the limit jack 18, the lifting slide 19, the base 191, the plug boss 192, the rail pulley 193, the locating pin 194, the pull buckle 195, the clamping groove 196, the fixing pin 197, the second lifting rail 31, the rail lifting joint 32, the outer shell 33, the rail clamping seat 34, the driving slide block 35, the finger pull buckle 36, the locating pin 37, the return spring 38, the ladder slope 39, the middle pier seat 51, the cross connecting rod 52, the auxiliary connecting rod 53, the connecting piece 54, the folding pier seat 55, the stop 56, the rotating seat 57, the handle 58, the groove 59, the left and right connecting rod 61, the folding joint 62, the pressing switch 63, the limit bar 64, the left and the right bed frame 71, and the right bed frame 72.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the present utility model is described below by means of specific embodiments shown in the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the utility model. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present utility model.

It should be noted here that, in order to avoid obscuring the present utility model due to unnecessary details, only structures and/or processing steps closely related to the solution according to the present utility model are shown in the drawings, while other details not greatly related to the present utility model are omitted.

Referring to fig. 1-3, the specific embodiment adopts the following technical scheme that the foldable frame comprises a first quadrant arc-shaped frame 1, a second quadrant arc-shaped frame 2, a third quadrant arc-shaped frame 3, a fourth quadrant arc-shaped frame 4, a folding underframe 5, folding fences 6, a two-layer bedstead 7, a top cover 8 and a bottom cover 9, wherein the bottoms of the first quadrant arc-shaped frame 1, the second quadrant arc-shaped frame 2, the third quadrant arc-shaped frame 3 and the fourth quadrant arc-shaped frame 4 are connected through the folding underframe 5, the inner sides of the upper ends of adjacent sides of the four groups of frames are connected with the folding fences 6, meanwhile, the middle of the four groups of frames is movably connected with a detachable liftable two-layer bedstead 7, the folding underframe 5 is lifted upwards to drag the first quadrant arc-shaped frame 1, the second quadrant arc-shaped frame 2, the third quadrant arc-shaped frame 3 and the fourth quadrant arc-shaped frame 4 to the middle to form a cylindrical structure, and simultaneously, the folding fences 6 are hidden downwards on the inner sides of the arc-shaped frames, and are fixed with the arc-shaped frame through the top cover 8 and the bottom cover 9.

Furthermore, the two-layer bed frame 7 belongs to an external expansion structure and needs to be stored independently, a mattress can be paved at the upper end of the two-layer bed frame 7 for sleeping, the surface of the folding underframe 5 can be paved with the mattress as a standby bed to form an upper double-layer bed and a lower double-layer bed, in addition, a hard table plate can be paved at the upper end of the two-layer bed frame 7, and the unilateral folding fence 6 can be lowered to be switched into a child table for use. The folding fence 6 is wrapped with an elastic net hung downwards for peripheral protection. The lower edge of the elastic net is connected to an arc-shaped enclosure frame or a folding underframe 5, and an expansion storage frame can be hung on the folding fence 6.

Referring to fig. 4 and 7, the first quadrant arc enclosure frame 1 and the second quadrant arc enclosure frame 2 have the same structure, the third quadrant arc enclosure frame 3 and the fourth quadrant arc enclosure frame 4 have the same structure, the third quadrant arc enclosure frame 3 is provided with a second lifting rail 31 on the basis of the first quadrant arc enclosure frame 1, and a part of folding rod plug-in connectors 13 are replaced by rail lifting connectors 32 so that the single-side rail can be lifted.

Further, the first quadrant arc-shaped enclosing frame 1 and the second quadrant arc-shaped enclosing frame 2 comprise a top angle 10, a bottom angle 11, column pipes 12, folding rod plug connectors 13, a bottom frame fixing seat 14, buckles 15, rollers 16, lifting rails 17, limiting plug holes 18 and lifting sliding blocks 19, two sides of the inner side of the upper end of the top angle 10 are respectively connected with a pair of movable folding rod plug connectors 13, an integrated bottom frame fixing seat 14 is arranged in the middle of the inner side of the bottom angle 11, two sides of the inner side of the bottom angle 11 are provided with integrated buckles 15, the rollers 16 are inserted in the middle of the bottom angle 11, a plurality of column pipes 12 are inserted between the top angle 10 and the bottom angle 11, the middle column pipes 12 are provided with lifting rails 17, limiting plug holes 18 are formed in the inner wall of the lifting rails 17, and lifting sliding blocks 19 are movably clamped in the lifting rails 17. The middle of the column tube 12 at the side is provided with a second lifting rail 31, and a fence lifting joint 32 is movably clamped in the second lifting rail 31. The top cover 8 is matched and inserted with the round caulking grooves at the top end of the top angle 10 through four groups of hollow columns at the lower edge to realize the fixation of the top cover 8, the bottom cover 9 is matched and inserted with the buckles 15 at the inner side of the bottom angle 11 through the upturned lug edges at the upper edge to realize the fixation of the bottom cover 9, the first quadrant arc-shaped enclosing frame 1 and the second quadrant arc-shaped enclosing frame 2 have the same structure, and the third quadrant arc-shaped enclosing frame 3 and the fourth quadrant arc-shaped enclosing frame 4 are kept in close fit.

Referring to fig. 5 and 6, the lifting slider 19 comprises a base 191, a plug convex seat 192, a track pulley 193, a positioning pin piece 194, a pull buckle 195, a clamping groove 196 and a connecting rod 197, wherein the outer side of the base 191 is provided with an integrated plug convex seat 192, the upper end and the lower end of the plug convex seat 192 are respectively connected with a pair of track pulleys 193, the middle of the plug convex seat 192 is plugged with the positioning pin piece 194 with a reset spring, the tail part of the positioning pin piece 194 is connected with the pull buckle 195 movably buckled at the upper end of the base 191 through a fixed plug 197 to realize the unlocking linkage of the positioning pin piece 194, and the tail part of the base 191 is provided with the clamping groove 196. The side walls of the base 191 are respectively provided with a pair of sliding grooves, the fixing bolts 197 are inserted into the sliding grooves and are fixed through end bolts, so that the pull buckle 195 can slide left and right on the surface of the base 191, and the locating pin piece 194 moves backwards simultaneously and is separated from the limiting jack 18 due to the linkage action of the fixing bolts 197 when the pull buckle 195 is pulled backwards manually, at the moment, the lifting slide blocks 19 can slide along the lifting track 17, and the other three groups of lifting slide blocks 19 can synchronously adjust, so that the height adjustment of the two-layer bed frame 7 is realized.

Referring to fig. 8-9, the rail lifting joint 32 comprises an outer shell 33, a rail clamping seat 34, a driving sliding block 35, a finger pull buckle 36, a positioning pin shaft 37, a reset spring 38 and a step slope 39, wherein the inner side of the front end of the outer shell 33 is provided with the integrated rail clamping seat 34, the positioning pin shaft 37 is inserted into the rail clamping seat 34 through the reset spring 38, the driving sliding block 35 is movably arranged in the outer shell 33, the step slope 39 is arranged at the front end of the driving sliding block 35 and attached to the tail of the positioning pin shaft 37 to realize telescopic jacking, and the tail of the driving sliding block 35 is connected with the finger pull buckle 36 at the lower end of the tail of the outer shell 33. When the lifting fence is adjusted, the finger pull buckles 36 at the lower ends of the left fence lifting joint 32 and the right fence lifting joint 32 are simultaneously buckled to pull the driving sliding blocks 35 backwards, at the moment, the contact surface between the tail parts of the positioning pins 37 and the step slope 39 changes (the step slope slides from a high platform to a low platform), the positioning pins 37 retract inwards under the action of the reset springs 38 to unlock the fixing of the fence lifting joint 32, and the front fence can lift along the second lifting track 31.

Referring to fig. 11 and 12, the folding chassis 5 comprises a middle pier seat 51, cross connecting rods 52, auxiliary connecting rods 53, connecting pieces 54, a folding pier seat 55, a stop 56, a rotating seat 57 and a handle 58, wherein four groups of cross connecting rods 52 are symmetrically connected to the outer side of the middle pier seat 51, the stop 56 is connected to the top ends of the second cross connecting rods 52 and the fourth cross connecting rods 52 of the four groups of cross connecting rods 52 and clamped in reserved grooves in the middle of the middle pier seat 51, the auxiliary connecting rods 53 are transversely connected between the first quadrants and the third quadrants of the four groups of cross connecting rods 52 through the connecting pieces 54, a folding pier seat 55 is arranged in the middle of the auxiliary connecting rods 53, the middle of the middle pier seat 51 is connected with the rotating seat 57 through a spring shaft, the handle 58 is clamped in the middle of the rotating seat 57, a pair of symmetrical engagement grooves 59 are formed in the outer side of the rotating seat 57, and the engagement grooves 59 are kept with the stop 56 at the top ends of the cross connecting rods 52 through tooth grooves. The lower ends of the middle pier seat 51 and the folding pier seat 55 are connected with integral supporting legs, so that enough support is provided for the folding underframe 5 to avoid deformation and collapse.

Further, the top ends of the cross connecting rods 52 are connected with the first quadrant arc enclosing frame 1, the second quadrant arc enclosing frame 2, the third quadrant arc enclosing frame 3 and the bottom chassis fixing seat 14 at the bottom of the fourth quadrant arc enclosing frame 4, so that the connection and fixation between the folding chassis 5 and the four groups of arc enclosing frames are realized. When the folding chassis 5 is folded, the handle 58 drives the rotating seat 57 to rotate to one side, so that the engagement groove 59 is disengaged from the block 56, then the folding pier seat 55 is lifted upwards by the handle 58, and in the process of upwards moving the folding pier seat 55, the cross connecting rods 52 synchronously upwards and pull the four groups of outer arc-shaped surrounding frames inwards, and at the moment, the auxiliary connecting rods 53 synchronously bend the folding pier seat 55 to be jacked upwards.

Referring to fig. 13, the folding fence 6 comprises a left connecting rod 61, a right connecting rod 61 and a folding joint 62, wherein the two sides of the folding joint 62 are movably connected with the left connecting rod 61 and the right connecting rod 61 through rivets, the inner side of the lower end of the folding joint 62 is movably clamped with a pressing switch 63, a pair of linkage limiting rods 64 are inserted into a guide chute in the middle of the pressing switch 63, the pressing switch 63 is used for inwards contracting and unlocking the linkage limiting rods 64 to limit the ends of the left connecting rod 61 and the right connecting rod 61 through pressing, the left connecting rod 61 and the right connecting rod 61 can be folded downwards, the two ends of the folding fence 6 are inserted into a folding rod inserting joint 13 and are fixed by matching bolts to form a fixed fence, and the two ends of the folding fence 6 are inserted into a fence lifting joint 32 and are fixed by matching bolts to form a lifting fence.

Referring to fig. 14, the two-layer bed frame 7 comprises a left bed frame 71 and a right bed frame 72, wherein the left bed frame 71 and the right bed frame 72 are connected by way of plug-in matched pin shafts, and four corners of the two-layer bed frame 7 are connected with clamping grooves 196 at the tail of the lifting slide block 19 by outward expanding support arms. The two layers of bed frames 7 and the clamping grooves 196 are limited and fixed through ribs on the inner walls of the clamping grooves 196.

The two-layer bed frame has the advantages that the foldable baby bed adopts a gathering type folding structure, the volume after folding is greatly reduced, the occupied space is reduced, the portability is improved, the two-layer bed frame can be used for lifting and adjusting gears, the two-layer bed frame can be matched with a mattress to enable the baby bed to be kept flush with an adult bed, the use safety is improved, the mattress on the two-layer bed frame is replaced by a hard table plate, the traditional baby bed is changed into a child table, and the functional diversity is greatly improved, so that the living game requirement is met.

Claims (10)

1. A folding multifunctional baby crib is characterized by comprising a first quadrant arc-shaped enclosing frame, a second quadrant arc-shaped enclosing frame, a third quadrant arc-shaped enclosing frame, a fourth quadrant arc-shaped enclosing frame, a folding underframe, folding fences, two-layer bed frames, a top cover and a bottom cover, wherein the bottoms of the first quadrant arc-shaped enclosing frame, the second quadrant arc-shaped enclosing frame, the third quadrant arc-shaped enclosing frame and the fourth quadrant arc-shaped enclosing frame are connected through the folding underframe, the inner sides of the upper ends of adjacent edges of the four groups of enclosing frames are connected with the folding fences, meanwhile, the middle of the four groups of enclosing frames is movably connected with a detachable liftable two-layer bed frame, the folding underframe is pulled upwards to drag the first quadrant arc-shaped enclosing frame, the second quadrant arc-shaped enclosing frame, the third quadrant arc-shaped enclosing frame and the fourth quadrant arc-shaped enclosing frame towards the middle to form a cylindrical structure, and meanwhile, each folding fence is folded downwards and hidden on the inner sides of the arc-shaped enclosing frames and is folded and fixed through buckling of the top cover and the bottom cover and the arc-shaped enclosing frames.

2. The foldable multifunctional crib of claim 1, wherein the first quadrant arc-shaped enclosing frame and the second quadrant arc-shaped enclosing frame have the same structure, the first quadrant arc-shaped enclosing frame comprises a top angle, a bottom angle, a column tube, a folding rod plug-in connector, a bottom frame fixing seat, a buckle, rollers, lifting rails, limiting plug holes and lifting sliding blocks, two movable folding rod plug-in connectors are respectively connected to two sides of the inner side of the upper end of the top angle, an integrated bottom frame fixing seat is arranged in the middle of the inner side of the bottom angle, an integrated buckle is arranged on two sides of the inner side of the bottom angle, rollers are inserted in the middle of the bottom angle, a plurality of column tubes are inserted between the top angle and the bottom angle, lifting rails are arranged in the middle of the column tubes, limiting plug holes are formed in the inner wall of the lifting rails, and lifting sliding blocks are movably clamped in the lifting rails.

3. The folding multifunctional crib of claim 2, wherein the lifting sliding block comprises a base, a splicing convex seat, track pulleys, a positioning pin sheet, a pull buckle, a clamping groove and a fixing bolt, the outer side of the base is provided with an integrated splicing convex seat, the upper end and the lower end of the splicing convex seat are respectively connected with a pair of track pulleys, the middle of the splicing convex seat is spliced with a positioning pin sheet with a reset spring, the tail of the positioning pin sheet is connected with the pull buckle movably buckled at the upper end of the base through the fixing bolt to realize the unlocking linkage of the positioning pin sheet, and the tail of the base is provided with the clamping groove.

4. The foldable multifunctional crib of claim 1, wherein the third quadrant arc-shaped enclosing frame and the fourth quadrant arc-shaped enclosing frame have the same structure, the third quadrant arc-shaped enclosing frame is provided with a second lifting rail and a rail lifting joint on the basis of the first quadrant arc-shaped enclosing frame, the middle of a column tube on the side edge is provided with the second lifting rail, and the rail lifting joint is movably clamped in the second lifting rail.

5. The foldable multifunctional crib of claim 4, wherein the rail lifting joint comprises an outer shell, a rail clamping seat, a driving sliding block, a finger pull buckle, a positioning pin shaft, a reset spring and a step slope, wherein the inner side of the front end of the outer shell is provided with the integrated rail clamping seat, the positioning pin shaft is inserted into the rail clamping seat through the reset spring, the driving sliding block is movably arranged in the outer shell, the step slope at the front end of the driving sliding block is attached to the tail part of the positioning pin shaft to realize telescopic jacking, and the tail part of the driving sliding block is connected with the finger pull buckle at the lower end of the tail part of the outer shell.

6. The foldable multifunctional crib of claim 1, wherein the foldable underframe comprises a middle base pier seat, cross connecting rods, auxiliary connecting rods, connecting pieces, a foldable pier seat, a stop block, a rotating seat and a handle, four groups of cross connecting rods are symmetrically connected to the outer side of the middle base pier seat through pin shafts, the top ends of the second cross connecting rod and the fourth cross connecting rod of the four groups of cross connecting rods are connected with the stop block, the stop block is clamped in a reserved groove in the middle of the middle base pier seat, the first quadrant and the third quadrant of the four groups of cross connecting rods are transversely connected with the auxiliary connecting rods through the connecting pieces, the middle of the auxiliary connecting rods is provided with the foldable pier seat, the middle of the middle base pier seat is connected with the rotating seat through a spring shaft, the handle is clamped in the middle of the rotating seat, a pair of symmetrical meshing grooves are formed in the outer side of the rotating seat, and the meshing grooves are kept meshed with tooth grooves on the inner sides of the end heads of the stop block.

7. The foldable multi-functional crib of claim 6, wherein the top ends of the cross connecting rods are connected with the underframe fixing seats at the bottoms of the first quadrant arc enclosing frame, the second quadrant arc enclosing frame, the third quadrant arc enclosing frame and the fourth quadrant arc enclosing frame through pin shafts, so that movable connection between the foldable underframe and the four groups of arc enclosing frames is realized.

8. The folding multifunctional crib of claim 1, wherein the folding fence comprises a left connecting rod, a right connecting rod and a folding joint, wherein the left connecting rod and the right connecting rod are movably connected to two sides of the folding joint through rivets, a pressing switch with a reset spring is movably clamped on the inner side of the lower end of the folding joint, a pair of linkage limiting rods are inserted into a middle guide chute of the pressing switch, and the pressing switch is used for limiting the ends of the left connecting rod and the right connecting rod by inwards shrinking and unlocking the linkage limiting rods through pressing.

9. The foldable multi-functional crib of claim 8, wherein the two ends of the foldable rail are inserted into the folding rod insertion connector to form a fixed rail, and the two ends of the foldable rail are inserted into the rail lifting connector to form a liftable rail.

10. The foldable multifunctional crib of claim 1, wherein the two-layer bed frame comprises a left bed frame and a right bed frame, the left bed frame and the right bed frame are connected through pin shafts in a plug-in fit manner, and four corners of the two-layer bed frame are connected with clamping grooves at the tail parts of the lifting sliding blocks through outward-expanding support arms.