CN220009870U - Child cart - Google Patents

Abstract

The utility model discloses a child stroller, which can move from an unfolding position to a folding position after a locking device is unlocked, and comprises a front leg and a rear leg which is rotationally connected to the front leg around a first axis A, wherein the lower end of the front leg is connected with a front wheel, the lower end of the rear leg is connected with a rear wheel, the front leg is rotationally connected with a stay bar assembly which can be rotationally unfolded or folded relative to the front leg around a second axis B, the front leg is also connected with a seat support piece which can be rotationally unfolded or folded relative to the front leg around a third axis C, and a transmission assembly which can drive the seat support piece to rotationally close to the front leg and drive the front leg and the rear leg to close when the stay bar assembly is rotationally folded relative to the front leg is arranged among the seat support piece, the rear leg and the stay bar assembly. When the folding bicycle is folded, the whole bicycle can be folded by pushing the stay bar assembly to rotate towards the front legs to be close after the locking device is unlocked, the folding operation is simple, and the folded whole bicycle is small in size and convenient to store.

Description

Child cart

[ field of technology ]

The utility model relates to a child stroller.

[ background Art ]

At present, the child cart has become an indispensable article for the child in the growth process. The children's barrow on the market can be folded or unfolded generally, but the existing children's barrow is complex in transmission structure, more in connecting rods and larger in volume after folding. Therefore, a child stroller with a simple structure and a small size after folding is very desirable.

[ utility model ]

The utility model aims to overcome the defects of the prior art and provide the child cart which is convenient to fold and unfold, simple in structure and small in volume after folding.

The utility model is realized by the following technical scheme:

the utility model provides a children's shallow, can follow the expansion position and remove to folding position after unlocking locking device, includes front leg 11 and rotates around first axis A and connect the back leg 12 on front leg 11, front leg 11 lower extreme be connected with front wheel 111, back leg 12 lower extreme be connected with rear wheel 121, front leg 11 on rotate around second axis B and be connected with the stay bar subassembly 13 that can rotate relative it and expand or fold, front leg 11 on still be connected with the seat support piece 2 that can rotate relative it around third axis C and expand or fold, seat support piece 2, back leg 12 and stay bar subassembly 13 between be equipped with and can drive seat support piece 2 and rotate the drive assembly 3 that draws close and drive front leg 11 and back leg 12 draw close to front leg 11 when stay bar subassembly 13 rotates relative front leg 11 and fold.

The transmission assembly 3 comprises a first transmission rod 31, the front end of which is rotationally connected to the front leg 11 around a fourth axis D, the first transmission rod 31 is fixedly connected with the seat support 2, the transmission assembly 3 further comprises a second transmission rod 32, the rear end of which is rotationally connected to the rear leg 12 around a fifth axis E, the front end of the second transmission rod 32 is rotationally connected with the rear end of the first transmission rod 31 around a sixth axis F, a third transmission rod 33 which can be rotationally connected with the front end of the second transmission rod 32 or the rear end of the first transmission rod 31 relative to the brace rod assembly 13 is arranged between the front end of the second transmission rod 32 or the rear end of the first transmission rod 31, the lower end of the third transmission rod 33 is rotationally connected with the front end of the second transmission rod 32 or the rear end of the first transmission rod 31 around a seventh axis G, and the upper end of the third transmission rod 33 is rotationally connected with the brace rod assembly around an eighth axis H.

The eighth axis H is offset from the second axis B.

The second transmission rod 32 includes a first connecting section 321 rotatably connected to the rear end of the first transmission rod 31 around a sixth axis F, and a second connecting section 322 rotatably connected to the rear leg 12 around a fifth axis E, and a first bending section 323 is disposed between the first connecting section 321 and the second connecting section 322.

The third transmission rod 33 includes a third connection section 331 rotatably connected to the rear end of the first transmission rod 31 or the front end of the second transmission rod 32 around the seventh axis G, and an arc-shaped bending section 332 rotatably connected to the stay bar assembly 13 around the eighth axis H, a fourth connection section 333 parallel to the second connection section 322 is connected to the lower end of the arc-shaped bending section 332, and a second bending section 334 parallel to the first bending section 323 is disposed between the fourth connection section 333 and the third connection section 331.

The front leg 11 comprises a front leg rod 112, a connecting seat 113 is arranged at the upper end of the front leg rod 112, a front wheel 111 is connected to the lower end of the front leg rod 112, a protruding portion 114 protruding outwards is arranged on the connecting seat 113, the rear leg 12 is connected to the protruding portion 114 in a rotating mode around a first axis A, a connecting portion 115 is further connected to the front leg rod 112, the seat support 2 is connected to the connecting portion 115 in a rotating mode around a third axis C, and the stay rod assembly 13 is connected to the connecting seat 113 in a rotating mode around a second axis B.

The stay bar assembly 13 comprises a rotating seat 131 which is rotatably connected to the connecting seat 113, the rotating seat 131 is connected with a stay bar 132, a locking assembly 4 which can lock the rotating seat 131 and the front leg 11 is arranged between the rotating seat 131 and the front leg 11, the stay bar 132 is connected with a push rod 133 which can slide relatively to unlock the locking assembly 4, and a locking assembly 5 which can lock the stay bar 132 and the push rod 133 is arranged between the stay bar 132 and the push rod 133.

The locking assembly 4 comprises a locking position 41 arranged on a connecting seat 113, a sliding piece 42 capable of sliding along the rotating seat 131 is arranged on the rotating seat 131, a clamping piece 43 capable of sliding relatively to the sliding piece to clamp in or separate from the locking position 41 is arranged on the sliding piece 42, a reset piece 44 capable of pushing the sliding piece 42 to reset is arranged between the sliding piece 42 and the rotating seat 131, a sliding block 45 capable of sliding relatively to the sliding piece to push the sliding piece 42 is arranged on a supporting rod 132, a pushing portion 46 capable of pushing the sliding block 45 to slide is arranged at the bottom of the pushing rod 133, and a yielding groove 1131 capable of yielding for the clamping piece 43 is further arranged on the connecting seat 113.

The sliding member 42 is provided with a first inclined sliding surface 421, and the sliding block 45 is provided with a second inclined sliding surface 451 capable of being matched with the first inclined sliding surface 421.

The locking assembly 5 comprises a locking position 51 arranged on a supporting rod 132, a clamping piece 52 which can slide relatively to the pushing rod 133 and is clamped in or separated from the locking position 51 is arranged on the pushing rod 133, a sliding seat 53 which can slide relatively to the pushing rod 132 and drive the clamping piece 52 to move is arranged in the supporting rod 132, a chute 531 is arranged on the sliding seat 53, a third chute 532 is arranged on the chute 531, a protruding shaft 521 which protrudes into the chute 531 and can slide relatively to the supporting rod 132 when being pushed by the third chute 532 is arranged on the clamping piece 52, a guide groove 1331 which can guide the protruding shaft 521 to slide transversely is arranged on the pushing rod 133, an unlocking piece 54 which can rotate relatively to the pushing rod 133 is arranged on the pushing rod 133, a guy cable 55 is arranged between the unlocking piece 54 and the sliding seat 53, a first spring 56 which can push the clamping piece 52 to reset is arranged on the unlocking piece 54 and the pushing rod 133, and a second spring 57 which can push the clamping piece 52 to reset is arranged on the locking piece 52 and the pushing rod 133.

Compared with the prior art, the utility model has the following advantages:

1. when the child car needs to be folded, the locking device is unlocked firstly, then the stay bar assembly is rotated forwards, the stay bar assembly is rotated and folded around the second axis B relative to the front leg, the stay bar assembly drives the transmission assembly to move in the process that the stay bar assembly is rotated and folded towards the front leg, the transmission assembly drives the seat assembly to rotate towards the front leg and enables the front leg and the rear leg to be folded towards each other when moving, and when the stay bar assembly is folded towards the front leg, the seat assembly is folded towards the front leg and the rear leg is folded towards the front leg, the whole child car is completely folded, and the folded child car is small in size. When the folding bicycle is folded, the whole bicycle can be folded by pushing the stay bar assembly to rotate towards the front legs to be close after the locking device is unlocked, the folding operation is simple, and the folded whole bicycle is small in size and convenient to store.

2. When the supporting rod assembly is rotated and folded around the second axis B relative to the front leg, the supporting rod assembly drives the upper end of the third transmission rod to move, the upper end of the third transmission rod rotates around the eighth axis H relative to the supporting rod assembly, the lower end of the third transmission rod drives the front end of the second transmission rod and the rear end of the first transmission rod to move upwards when the third transmission rod moves, at the moment, the front end of the second transmission rod and the rear end of the first transmission rod rotate around the sixth axis F, and meanwhile, the front end of the first transmission rod rotates around the fourth axis D relative to the front leg, at the moment, the seat assembly is rotated and closed like the front leg, the rear end of the second transmission rod rotates around the fifth axis E relative to the rear leg, and the front leg and the rear leg rotate and are closed under the matched pulling of the first transmission rod and the second transmission rod.

[ description of the drawings ]

FIG. 1 is one of the perspective views of the child stroller of the present utility model;

FIG. 2 is a second perspective view of the child stroller of the present utility model;

FIG. 3 is a side view of the child stroller of the present utility model;

FIG. 4 is a cross-sectional view of the child stroller of the present utility model;

FIG. 5 is an enlarged view of region I of FIG. 4;

FIG. 6 is one of the exploded views of the child stroller of the present utility model;

FIG. 7 is a second exploded view of the child stroller of the present utility model;

FIG. 8 is a third exploded view of the child stroller of the present utility model;

FIG. 9 is a fourth exploded view of the child stroller of the present utility model;

FIG. 10 is a fifth exploded view of the child stroller of the present utility model;

FIG. 11 is an enlarged view of the J area of FIG. 4;

FIG. 12 is one of the exploded views of the locking assembly of the child stroller of the present utility model;

FIG. 13 is a second exploded view of the locking assembly of the child stroller of the present utility model;

FIG. 14 is a third exploded view of the locking assembly of the child stroller of the present utility model;

FIG. 15 is a perspective view of the child stroller of the present utility model folded;

FIG. 16 is a side view of the child stroller of the present utility model folded;

FIG. 17 is a perspective view of the child stroller of the present utility model shown in its fully folded configuration;

fig. 18 is a side view of the child stroller of the present utility model with the stroller folded.

[ detailed description ] of the utility model

The utility model is further described below with reference to the accompanying drawings:

as shown in fig. 1 to 18, the present utility model provides a stroller capable of moving from an unfolded position to a folded position after unlocking a locking device, comprising a front leg 11 and a rear leg 12 rotatably connected to the front leg 11 around a first axis a, wherein a front wheel 111 is connected to the lower end of the front leg 11, a rear wheel 121 is connected to the lower end of the rear leg 12, a strut assembly 13 capable of being unfolded or folded rotatably is rotatably connected to the front leg 11 around a second axis B, a seat support 2 capable of being unfolded or folded rotatably around a third axis C is further connected to the front leg 11, and a transmission assembly 3 capable of driving the seat support 2 to rotate towards the front leg 11 and driving the front leg 11 and the rear leg 12 to be folded when the strut assembly 13 is folded rotatably relative to the front leg 11 is provided between the seat support 2, the rear leg 12 and the strut assembly 13. When the child needs to be folded, the locking device is unlocked firstly, the stay bar assembly 13 is rotated forwards, the stay bar assembly 13 is rotated and folded relative to the front leg 11 around the second axis B, the stay bar assembly 13 drives the transmission assembly 3 to move in the process that the stay bar assembly 13 is rotated and folded towards the front leg 11, the seat assembly 2 is driven to rotate towards the front leg 11 and the rear leg 12 are folded towards each other when the transmission assembly 3 moves, and when the stay bar assembly 13 is folded towards the front leg 11, the seat assembly 2 is folded towards the front leg 11 and the rear leg 12 is folded towards the front leg 11, the whole child cart is completely folded, and the folded volume is small. When the folding device is folded, the whole vehicle can be folded by pushing the stay bar assembly 13 to rotate towards the front legs 11 after the locking device is unlocked, the folding operation is simple, and the folded whole vehicle has small volume and is convenient to store.

As shown in fig. 3 to 4, the transmission assembly 3 includes a first transmission rod 31 whose front end is rotatably connected to the front leg 11 around a fourth axis D, the first transmission rod 31 is fixedly connected to the seat assembly 2, the transmission assembly 3 further includes a second transmission rod 32 whose rear end is rotatably connected to the rear leg 12 around a fifth axis E, the front end of the second transmission rod 32 is rotatably connected to the rear end of the first transmission rod 31 around a sixth axis F, a third transmission rod 33 capable of being rotatably connected to the front end of the second transmission rod 32 or the rear end of the first transmission rod 31 and the brace assembly 13 is disposed between the front end of the second transmission rod 32 or the rear end of the first transmission rod 31, the lower end of the third transmission rod 33 is rotatably connected to the front end of the second transmission rod 32 or the rear end of the first transmission rod 31 around a seventh axis G, and the upper end of the third transmission rod 33 is rotatably connected to the rear end of the brace assembly around an eighth axis H. When the supporting rod assembly 13 is folded around the second axis B relative to the front leg 11, the supporting rod assembly 13 drives the upper end of the third transmission rod 33 to move, the upper end of the third transmission rod 33 rotates around the eighth axis H relative to the supporting rod assembly 13, the lower end of the third transmission rod 33 drives the front end of the second transmission rod 32 and the rear end of the first transmission rod 31 to move upwards when moving, at the same time, the front end of the second transmission rod 32 and the rear end of the first transmission rod 31 rotate around the sixth axis F, at the same time, the front end of the first transmission rod 31 rotates around the fourth axis D relative to the front leg 11, at the same time, the seat assembly 2 rotates as the front leg 11, the rear end of the second transmission rod 32 rotates around the fifth axis E relative to the rear leg 12, and the front leg 11 and the rear leg 12 rotate together when the first transmission rod 31 and the second transmission rod 32 are pulled together.

As shown in fig. 4, the eighth axis H is disposed offset from the second axis B. The arrangement is such that the front end of the second transmission rod 32 and the rear end of the first transmission rod 31 can be pulled to move and the second transmission rod 32 and the first transmission rod 31 can be brought close to each other when the upper end of the third transmission rod 33 rotates.

As shown in fig. 8 to 10, the second transmission rod 32 includes a first connecting section 321 rotatably connected to the rear end of the first transmission rod 31 about a sixth axis F, and a second connecting section 322 rotatably connected to the rear leg 12 about a fifth axis E, and a first bending section 323 is disposed between the first connecting section 321 and the second connecting section 322.

As shown in fig. 8 to 10, the third transmission rod 33 includes a third connection section 331 rotatably connected to the rear end of the first transmission rod 31 or the front end of the second transmission rod 32 around the seventh axis G, and an arc-shaped bending section 332 rotatably connected to the brace assembly 13 around the eighth axis H, wherein a fourth connection section 333 parallel to the second connection section 322 is connected to the lower end of the arc-shaped bending section 332, and a second bending section 334 parallel to the first bending section 323 is disposed between the fourth connection section 333 and the third connection section 331. The arrangement of the fourth connecting section 333 and the second bending section 334 enables the third transmission rod 33 to be arranged in parallel with the second transmission rod 32.

As shown in fig. 1, the front leg 11 includes a front leg rod 112, a connecting seat 113 is provided at an upper end of the front leg rod 112, a front wheel 111 is connected to a lower end of the front leg rod 112, a protruding portion 114 protruding outwards is provided on the connecting seat 113, the rear leg 12 is rotatably connected to the protruding portion 114 around a first axis a, a connecting portion 115 is further connected to the front leg rod 112, the seat support 2 is rotatably connected to the connecting portion 115 around a third axis C, and the stay bar assembly 13 is rotatably connected to the connecting seat 113 around a second axis B.

As shown in fig. 5, the brace rod assembly 13 includes a rotating seat 131 rotatably connected to the connecting seat 113, the rotating seat 131 is connected with a brace rod 132, a locking assembly 4 capable of locking the rotating seat 131 and the front leg 11 is arranged between the rotating seat 132 and the front leg 11, the brace rod 132 is connected with a push rod 133 capable of sliding relative to the brace rod to unlock the locking assembly 4, and a locking assembly 5 capable of locking the brace rod 132 and the push rod 133 is arranged between the brace rod 132 and the push rod 133. When the child stroller needs to be folded, the locking assembly 5 is unlocked firstly, and then the push rod 133 is operated to slide downwards to push the locking assembly 4 to unlock.

As shown in fig. 5, the locking assembly 4 includes a locking position 41 disposed on a connecting seat 113, the rotating seat 131 is provided with a sliding member 42 capable of sliding along with the sliding member, the sliding member 42 is provided with a clamping member 43 capable of sliding relative to the sliding member to clamp or separate from the locking position 41, a reset member 44 capable of pushing the sliding member 42 to reset is disposed between the sliding member 42 and the rotating seat 131, the supporting rod 132 is provided with a sliding block 45 capable of sliding relative to the supporting rod to push the sliding member 42, the bottom of the pushing rod 133 is provided with a pushing portion 46 capable of pushing the sliding block 45, and the connecting seat 113 is also provided with a yielding groove 1131 capable of yielding for the clamping member 43. The yielding groove 1131 is used for yielding the clamping piece 43, so as to prevent the clamping piece 43 from clamping the push rod assembly 13 and the front leg 11. When the push rod 133 slides downwards relative to the supporting rod 132, at this time, the pushing part at the bottom of the push rod 133 pushes the sliding block 45 to slide downwards, the inclined plane at the bottom of the sliding block 45 gradually pushes against the sliding piece 42, when the sliding block 45 moves, the sliding piece 42 is pushed to slide, the clamping piece 43 on the sliding piece 42 is driven to slide when the sliding piece 42 slides, the clamping piece 43 is separated from the locking position 41 on the connecting seat 113 when sliding, and at this time, the supporting rod assembly 13 can rotate relative to the front leg 11.

As shown in fig. 5, the sliding member 42 is provided with a first inclined sliding surface 421, and the sliding block 45 is provided with a second inclined sliding surface 451 capable of being matched with the first inclined sliding surface 421. The first inclined slide surface 421 and the second inclined slide surface 451 are abutted against each other so that the slider 42 is pushed to slide by the slider 45.

As shown in fig. 12 to 13, the locking assembly 5 includes a locking position 51 disposed on a supporting rod 132, the pushing rod 133 is provided with a locking piece 52 capable of sliding relatively to the locking piece to be locked or separated from the locking position 51, the supporting rod 132 is also provided with a sliding seat 53 capable of sliding relatively to the locking piece to drive the locking piece 52 to move, the sliding seat 53 is provided with a chute 531, the chute 531 is provided with a third chute 532, the locking piece 52 is provided with a protruding shaft 521 protruding into the chute 531 and capable of sliding relatively to the supporting rod 132 when being pushed by the third chute 532, the pushing rod 133 is further provided with a guide slot 1331 for guiding the protruding shaft 521 to slide transversely, the pushing rod 133 is further provided with an unlocking piece 54 capable of rotating relatively to the locking piece 54, a first spring 56 capable of pushing the locking piece 52 is disposed between the unlocking piece 54 and the sliding seat 53, and the pushing rod 133 is provided with a second spring 57 capable of pushing the locking piece 52, and the locking piece 52 is provided with a second spring 57 capable of pushing the locking piece 133. When the locking assembly 5 needs to be unlocked, the unlocking member 54 is operated, the unlocking member 54 rotates relative to the push rod 133, the pull cable 55 is pulled when the push rod 133 rotates, the pull cable 55 drives the sliding seat 53 to slide upwards, at this time, the third inclined sliding surface 532 on the sliding seat 53 pushes the protruding shaft 521 on the clamping member 52, the whole clamping member 52 is separated from the locking position 51 on the supporting rod 132 under the guidance of the guide groove 1331 on the push rod 133, and at this time, the push rod 133 can slide relative to the supporting rod 132 to unlock the locking assembly 4.

A seat cloth cover 6 which can be unfolded or folded along with the baby stroller is arranged between the seat assembly 2 and the stay bar assembly 13. The seat cloth cover 6 can be unfolded following the unfolding of the stroller and folded following the folding of the stroller.

Claims (10)

1. A child stroller movable from an unfolded position to a folded position upon unlocking a locking device, characterized in that: including preceding leg (11) and around first axis (A) rotate rear leg (12) of being connected on preceding leg (11), preceding leg (11) lower extreme be connected with front wheel (111), rear leg (12) lower extreme be connected with rear wheel (121), preceding leg (11) on rotate around second axis (B) and be connected with can rotate relative expansion or folding vaulting pole subassembly (13), preceding leg (11) on still be connected with can rotate relative around third axis (C) and expand or folding seat support piece (2), rear leg (12) and vaulting pole subassembly (13) between be equipped with can drive seat support piece (2) to preceding leg (11) rotate and draw close and drive preceding leg (11) and rear leg (12) and draw close drive assembly (3) when preceding leg (11) rotate folding.

2. The stroller of claim 1, wherein: the transmission assembly (3) comprises a first transmission rod (31) with the front end connected to the front leg (11) in a rotating mode around a fourth axis (D), the first transmission rod (31) is fixedly connected with the seat support (2), the transmission assembly (3) further comprises a second transmission rod (32) with the rear end connected to the rear leg (12) in a rotating mode around a fifth axis (E), the front end of the second transmission rod (32) is connected with the rear end of the first transmission rod (31) in a rotating mode around a sixth axis (F), a third transmission rod (33) capable of being connected with the front end of the second transmission rod (32) or the rear end of the first transmission rod (31) in a rotating mode relative to the first transmission rod and the support rod assembly (13) is arranged between the front end of the third transmission rod (33), the lower end of the third transmission rod (33) is connected with the front end of the second transmission rod (32) or the rear end of the first transmission rod (31) in a rotating mode around a seventh axis (G), and the upper end of the third transmission rod (33) is connected with the front end of the second transmission rod (32) in a rotating mode around an eighth axis (H).

3. The stroller of claim 2, wherein: the eighth axis (H) is offset from the second axis (B).

4. The stroller of claim 2, wherein: the second transmission rod (32) comprises a first connecting section (321) rotationally connected to the rear end of the first transmission rod (31) around a sixth axis (F) and a second connecting section (322) rotationally connected to the rear leg (12) around a fifth axis (E), and a first bending section (323) is arranged between the first connecting section (321) and the second connecting section (322).

5. The stroller of claim 2, wherein: the third transmission rod (33) comprises a third connecting section (331) which is rotationally connected to the rear end of the first transmission rod (31) or the front end of the second transmission rod (32) around a seventh axis (G) and an arc-shaped bending section (332) which is rotationally connected to the stay rod assembly (13) around an eighth axis (H), the lower end of the arc-shaped bending section (332) is connected with a fourth connecting section (333) parallel to the second connecting section (322), and a second bending section (334) parallel to the first bending section (323) is arranged between the fourth connecting section (333) and the third connecting section (331).

6. The stroller of claim 1, wherein: the front leg (11) include front leg pole (112), front leg pole (112) upper end be equipped with connecting seat (113), front leg pole (112) lower extreme be connected with front wheel (111), connecting seat (113) on be equipped with outside convex bulge (114), rear leg (12) around first axis (A) pivoted connection on bulge (114), front leg pole (112) on still be connected with connecting portion (115), seat support (2) around third axis (C) rotate and be connected on connecting portion (115), vaulting pole subassembly (13) around second axis (B) pivoted connection on connecting seat (113).

7. The stroller of claim 1, wherein: the stay bar assembly (13) comprises a rotating seat (131) which is rotationally connected to a connecting seat (113), the rotating seat (131) is connected with a stay bar (132), a locking assembly (4) which can lock the rotating seat (131) and the front leg (11) is arranged between the rotating seat (131) and the front leg (11), the stay bar (132) is connected with a push rod (133) which can slide relatively to unlock the locking assembly (4), and a locking assembly (5) which can lock the stay bar (132) and the push rod (133) is arranged between the stay bar (132) and the push rod.

8. The stroller of claim 7, wherein: the locking assembly (4) comprises a locking position (41) arranged on a connecting seat (113), a sliding part (42) capable of following the sliding part is arranged on the rotating seat (131), a clamping part (43) capable of sliding relatively to the sliding part to clamp or separate from the locking position (41) is arranged on the sliding part (42), a reset part (44) capable of pushing the sliding part (42) to reset is arranged between the sliding part (42) and the rotating seat (131), a sliding block (45) capable of sliding relatively to push the sliding part (42) to slide is arranged on a supporting rod (132), a pushing part (46) capable of pushing the sliding block (45) is arranged at the bottom of the pushing rod (133), and a yielding groove (1131) capable of yielding for the clamping part (43) is further arranged on the connecting seat (113).

9. The stroller of claim 8, wherein: the sliding piece (42) is provided with a first inclined sliding surface (421), and the sliding block (45) is provided with a second inclined sliding surface (451) which can be matched with the first inclined sliding surface (421).

10. The stroller of claim 7, wherein: the locking assembly (5) comprises a locking position (51) arranged on a supporting rod (132), a clamping piece (52) which can slide relatively to the pushing rod and clamp or separate from the locking position (51) is arranged on the pushing rod (133), a sliding seat (53) which can slide relatively to the supporting rod and drive the clamping piece (52) to move is further arranged in the supporting rod (132), an inclined sliding groove (531) is arranged on the sliding seat (53), a third inclined sliding surface (532) is arranged on the inclined sliding groove (531), a protruding shaft (521) which protrudes into the inclined sliding groove (531) and can slide relatively to the supporting rod (132) when being pushed by the third inclined sliding surface (532) is arranged on the clamping piece (52), a guide groove (1331) which can guide the protruding shaft (521) to slide transversely is further arranged on the pushing rod (133), an unlocking piece (54) which can rotate relatively to the sliding seat (53), a sliding cable (55) is arranged between the unlocking piece (54) and the sliding seat (53), and a restoring piece (52) can be pushed by the restoring piece (52), and the pushing piece (133) can be pushed by the restoring piece (52).