CN110481621B - Child cart - Google Patents

Abstract

The invention discloses a baby stroller, which comprises a front bracket, a rear bracket, a push rod bracket, a stay rod bracket, a front connecting bracket, a rear connecting bracket, a front connecting rod and a rear connecting rod, wherein the front bracket comprises a front upper bracket and a front lower bracket which slide and stretch relatively along the length direction, the rear bracket comprises a rear upper bracket and a rear lower bracket which slide and stretch relatively along the length direction, the front connecting bracket and the rear connecting bracket rotate relatively and fold relatively in the folding process of the stroller frame, the front connecting rod and the rear connecting rod drive the front upper bracket and the front lower bracket to shrink respectively along the length direction, and the rear upper bracket and the rear lower bracket are respectively contracted along the length direction, so that the length of the front bracket and the rear bracket is reduced, the overall height of the folded stroller frame is greatly reduced, the overall size of the folded stroller frame is further reduced, and convenience is brought to daily carrying and storage of users.

Description

Strollers

Technical Field

The invention relates to a baby stroller.

Background technique

Strollers play an important role in helping users carry infants and young children in their daily lives, and have become one of the indispensable children's products in the process of children's growth. In the prior art, the structures of strollers are various, the connection relationships of the various rods are also different, the folding methods and folding principles of the frames are also different, and the shapes and volumes after folding are also different. The stroller frame of a conventional stroller includes a front bracket, a rear bracket and a push rod frame. When the stroller frame is folded, the front bracket, the rear bracket and the push rod frame are folded together, so the length of the front bracket and the rear bracket completely affects the size of the entire stroller after folding. However, if the lengths of the front bracket and the rear bracket are reduced in order to reduce the height of the frame after folding, the height of the seat on the frame will be reduced, affecting the riding comfort.

Summary of the invention

The purpose of the present invention is to provide a novel baby stroller.

To achieve the above object, the technical solution adopted by the present invention is: a child stroller, comprising a stroller frame having an unfolded state and a folded state, a front wheel assembly provided at the front bottom of the stroller frame, a rear wheel assembly provided at the rear bottom of the stroller frame, and a locking mechanism for locking the stroller frame in the unfolded state, wherein the stroller frame comprises:

A front bracket, comprising a front upper bracket and a front lower bracket that are relatively slidable and telescopic along the length direction;

A rear bracket, comprising a rear upper bracket and a rear lower bracket that are relatively slidable and retractable along the length direction;

A push rod frame, comprising a lower push rod frame, an upper push rod frame whose lower part is rotatably connected to the upper part of the lower push rod frame, wherein two of the upper part of the front upper frame, the upper part of the rear upper frame and the lower part of the lower push rod frame are rotatably connected and the third is rotatably connected to one of the two, or the three are rotatably connected together;

A connecting frame assembly, comprising a front connecting frame and a rear connecting frame respectively arranged along the front-to-back direction, the front connecting frame and the rear connecting frame are rotatably connected to each other, the front portion of the front connecting frame is rotatably connected to the front upper bracket, and the rear portion of the rear connecting frame is rotatably connected to the rear upper bracket;

A front connecting rod, one end of which is rotatably connected to the front lower bracket, and the other end of which is rotatably connected to the front portion of the rear connecting frame;

A rear connecting rod, one end of which is rotatably connected to the rear lower bracket, and the other end of which is rotatably connected to the rear of the front connecting frame;

A support rod frame, the support rod frame is rotatably connected to the rear upper bracket, the upper part of the support rod frame is rotatably connected to the lower part of the upper push rod frame, and the lower part of the support rod frame can be relatively rotated and relatively slidably connected to the rear connecting frame along the length extension direction of the rear connecting frame.

Preferably, when the cart frame is in a folded state, the push rod frame and the support rod frame are flipped and folded at the rear side of the rear bracket, the front connecting frame and the rear connecting frame are relatively rotated and folded, and the front bracket and the rear bracket are respectively shortened in length and folded together in the front-to-back direction.

Preferably, when the cart frame is folded, the front connecting frame and the rear connecting frame rotate relative to each other and are folded together in the front-to-back direction, wherein the rear portion of the front connecting frame and the front portion of the rear connecting frame move upward respectively.

Preferably, the front connecting frame is rotatably connected to the rear connecting frame via a first axis, the front connecting rod is rotatably connected to the rear connecting frame via a second axis, the rear connecting rod is rotatably connected to the front connecting frame via a third axis, and when the cart frame is in an unfolded state, the first axis is located between the second axis and the third axis in the front-to-back direction.

Preferably, the support rod frame is rotatably connected to the rear upper bracket via a fourth axis, the rear portion of the rear connecting frame is rotatably connected to the rear upper bracket via a fifth axis, and the fourth axis is located above the fifth axis on the rear upper bracket.

Preferably, the upper portion of the upper push rod frame is rotatably connected to the lower push rod frame via a sixth axis, the upper portion of the support rod frame is rotatably connected to the lower portion of the lower push rod frame via a seventh axis, and the sixth axis and the seventh axis are two axes whose axis centers are parallel to each other.

Preferably, the cart frame further comprises a seat frame arranged along the front-rear direction, the rear portion of the seat frame is rotatably connected to the support rod frame, and the front portion of the seat frame is relatively slidably connected to the lower push rod frame along its own length direction.

Preferably, the upper part of the front upper bracket, the upper part of the rear upper bracket and the lower part of the lower push rod bracket are rotatably connected together around the same rotation center line, and the locking mechanism includes a main locking joint arranged between the upper part of the front upper bracket, the upper part of the rear upper bracket and the lower part of the lower push rod bracket for relative locking of the three, and a push rod locking joint arranged between the upper push rod bracket and the lower push rod bracket for relative locking of the two, the main locking joint and the push rod locking joint are arranged to be unlocked in a linked manner, and the push rod bracket is also provided with an unlocking operating member for unlocking the push rod locking joint.

Preferably, the front wheel assembly is arranged at the bottom of the front lower bracket, and the rear wheel assembly is arranged at the bottom of the rear lower bracket. When the cart frame is in a folded state, the front wheel assembly and the rear wheel assembly are jointly supported on the ground, and the upper end of the upper push rod frame is not higher than the top ends of the front bracket and the rear bracket.

Furthermore, the cart frame includes two groups of side brackets arranged on the left and right sides, and the side bracket on each side includes the front bracket, the rear bracket, the push rod bracket and the support rod bracket, and the front connecting frame, the rear connecting frame, the front connecting rod and the rear connecting rod are arranged between the two groups of side brackets.

Furthermore, the front connecting frame has two front side rods respectively arranged on the left and right sides and extending in the front-to-back direction, and the rear connecting frame has two rear side rods respectively arranged on the left and right sides and extending in the front-to-back direction. On the left and right sides of the cart frame, the front side rods are rotatably connected to the rear side rods, the front part of the front side rods is rotatably connected to the front upper bracket on the same side, and the rear part of the rear side rods is rotatably connected to the rear upper bracket on the same side.

Furthermore, the front link and the rear link each have two groups arranged on the left and right sides. On the left and right sides of the cart frame, the front link is rotatably connected between the front lower bracket and the front part of the rear side rod, and the rear link is rotatably connected between the rear lower bracket and the rear part of the front side rod.

Furthermore, the front connecting frame also has a front connecting rod extending in the left-right direction and located between the rear portions of the two front side rods, and the rear connecting frame also has a rear connecting rod extending in the left-right direction and located between the front portions of the two rear side rods. A front cross bar is provided between the front lower brackets on both sides, and a rear cross bar is provided between the rear lower brackets on both sides. The front connecting rod is rotatably provided between the front cross bar and the rear connecting rod, and the rear connecting rod is rotatably provided between the rear cross bar and the front connecting rod.

Furthermore, the lower part of the support rod frame on each side is rotatably connected to a sliding member, and the sliding member can be slidably arranged on the rear side rod along the length extension direction of the rear side rod, and the sliding member is located on the rear side rod behind the rotational connection position of the front side rod and the rear side rod.

Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: the child stroller of the present invention has a simple stroller frame structure and a simple folding operation, and during the folding process, the front bracket and the rear bracket can be synchronously contracted along their respective length directions to reduce the length, so that the overall height of the stroller frame after folding is greatly reduced, and the overall size of the stroller frame after folding is further reduced, which brings convenience to the user's daily carrying and storage.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a perspective view of the child stroller of Example 1 in an unfolded state;

FIG2 is a side view of the child stroller of Example 1 in the unfolded state;

FIG3 is a side view of the child stroller of Example 1 in a semi-folded state;

FIG4 is a side view of the child stroller of Example 1 in a folded state;

FIG5 is a perspective view of the child stroller of Example 2 in an unfolded state;

FIG6 is a side view of the child stroller of Example 2 in the unfolded state;

FIG. 7 is a side view of the child stroller of Example 2 in a semi-folded state;

FIG8 is a side view of the child stroller of Example 2 in a folded state;

Among them: 1, front bracket; 11, front upper bracket; 12, front lower bracket; 100, front crossbar;

2. Rear bracket; 21. Rear upper bracket; 22. Rear lower bracket; 200. Rear cross bar;

3. Push rod rack; 31. Upper push rod rack; 311. Upper push rod; 312. Push handle; 32. Lower push rod rack;

4. Support rod frame; 5. Front connecting frame; 51. Front connecting rod; 52. Front side rod; 6. Rear connecting frame; 61. Rear connecting rod; 62. Rear side rod; 7. Front connecting rod; 8. Rear connecting rod; 9. Sliding member; 10. Seat frame; 20. Sliding sleeve; 201. Sliding sleeve cross bar; 30. Push rod locking joint; 40. Main locking joint; 50. Unlocking operating member; 60. Front wheel assembly; 70. Rear wheel assembly; a. First axis; b. Second axis; c. Third axis; d. Fourth axis; e. Fifth axis; f. Sixth axis; g. Seventh axis.

Detailed ways

The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

Example 1

1 to 4 , the stroller includes a stroller frame having an unfolded state and a folded state, a front wheel assembly 60 disposed at the front bottom of the stroller frame, a rear wheel assembly 70 disposed at the rear bottom of the stroller frame, and a locking mechanism for locking the stroller frame in the unfolded state.

The cart frame includes side brackets arranged on the left and right sides, and each side bracket includes a front bracket 1, a rear bracket 2, a push rod bracket 3, and a support rod bracket 4. A connecting frame assembly, a front connecting rod 7 and a rear connecting rod 8 are also arranged between the side brackets on both sides.

Among them, on the left and right sides of the cart frame, the front bracket 1 gradually extends upward from the front to the back when the cart frame is in the unfolded state, and includes a front upper bracket 11 and a front lower bracket 12 that can slide and retract relatively along the length direction, and the front wheel assembly 60 is arranged at the bottom of the front lower bracket 12; the rear bracket 2 gradually extends upward from the back to the front when the cart frame is in the unfolded state, and includes a rear upper bracket 21 and a rear lower bracket 22 that can slide and retract relatively along the length direction, and the rear wheel assembly 70 is arranged at the bottom of the rear lower bracket 22; the push rod frame 3 includes a lower push rod frame 32, an upper push rod frame 31 whose lower part is rotatably connected to the upper part of the lower push rod frame 32, and the upper push rod frame 31 includes an upper push rod 311 and a push handle rod 312 that can slide and retract relatively, and the push handle rods 312 on both sides are integrally arranged to form a U-shaped rod. On the left and right sides of the cart frame, among the upper part of the front upper bracket 11, the upper part of the rear upper bracket 21 and the lower part of the lower push rod bracket 32, two of them are rotatably connected and the third is rotatably connected to one of the above two, or the above three are rotatably connected together. Specifically in this embodiment, the upper part of the front upper bracket 11, the upper part of the rear upper bracket 21 and the lower part of the lower push rod bracket 32 are rotatably connected together around the same rotation center line.

The connecting frame assembly includes a front connecting frame 5 and a rear connecting frame 6, each of which is arranged along the front-to-back direction. The front connecting frame 5 and the rear connecting frame 6 are rotatably connected to each other. The front portion of the front connecting frame 5 is rotatably connected to the front upper bracket 11, and the rear portion of the rear connecting frame 6 is rotatably connected to the rear upper bracket 21; one end of the front connecting rod 7 is rotatably connected to the front lower bracket 12, and the other end thereof is rotatably connected to the front portion of the rear connecting frame 6; one end of the rear connecting rod 8 is rotatably connected to the rear lower bracket 22, and the other end thereof is rotatably connected to the rear portion of the front connecting frame 5. Among them, the front connecting frame 5 and the rear connecting frame 6 are rotatably connected through a first axis a, the front connecting rod 7 and the rear connecting frame 6 are rotatably connected through a second axis b, and the rear connecting rod 8 and the front connecting frame 5 are rotatably connected through a third axis c. When the cart frame is in an unfolded state, the first axis a is located between the second axis b and the third axis c along the front-to-back direction.

On the left and right sides of the cart frame, the support rod frame 4 is rotatably connected to the rear upper bracket 21 through the fourth axis d, and the fourth axis d is located on the rear upper bracket 21 above the fifth axis e, which is the rotating axis between the rear upper bracket 21 and the rear part of the rear connecting frame 6; the upper part of the support rod frame 4 is rotatably connected to the lower part of the upper push rod frame 31 through the seventh axis g, and the seventh axis g and the sixth axis f, which is the rotating connection axis between the upper push rod frame 31 and the lower push rod frame 32, are two axes whose center lines are parallel to each other, and here, the sixth axis f is located on the upper push rod frame 31 above the seventh axis g; the lower part of the support rod frame 4 is connected to the rear connecting frame 6 so as to be relatively rotatable and relatively slidable along the length extension direction of the rear connecting frame 6.

Specifically, in this embodiment, a front cross bar 100 is provided between the front lower brackets 12 on both sides, and a rear cross bar 200 is provided between the rear lower brackets 22 on both sides; the front connecting frame 5 has two front side bars 52 respectively arranged on the left and right sides and extending in the front-to-back direction, and a front connecting rod 51 located between the two front side bars 52 and extending in the left-to-right direction, where the front connecting rod 51 and the two front side bars 52 are integrally arranged to form a U-shaped bar with an opening facing forward; the rear connecting frame 6 has two rear side bars 62 respectively arranged on the left and right sides and extending in the front-to-back direction, and a rear connecting rod 61 located between the two rear side bars 62 and extending in the left-to-right direction. On the left and right sides of the cart frame, the front side bar 52 and the rear side bar 62 are rotatably connected around the first axis a, the front part of the front side bar 52 is rotatably connected to the front upper bracket 11 on the same side, and the rear part of the rear side bar 62 is rotatably connected to the rear upper bracket 21 on the same side. The lower part of the support rod frame 4 on each side is rotatably connected to a sliding member 9, where the sliding member 9 is a sliding sleeve, which is slidably arranged on the rear side rod 62 along the length extension direction of the rear side rod 62, and the sliding sleeve 9 is located on the rear side rod 62 behind the first axis a.

The front link 7 is rotatably arranged between the front cross bar 100 and the rear connecting rod 61, and the rear link 8 is rotatably arranged between the rear cross bar 200 and the front connecting rod 51. Here, the two ends of the front link 7 are respectively provided with annular sleeve portions, so that they are respectively rotatably mounted on the front cross bar 100 and the rear connecting rod 61 and directly rotate around the axis of the front cross bar 100 or the axis of the rear connecting rod 61; similarly, the two ends of the rear link 8 are also respectively provided with annular sleeves, so that they are respectively rotatably mounted on the rear cross bar 200 and the front connecting rod 51 and directly rotate around the axis of the rear cross bar 200 or the axis of the front connecting rod 51.

As shown in the accompanying drawings, the cart frame also includes a seat frame 10 arranged along the front and rear directions. On the left and right sides of the cart frame, the rear portion of the seat frame 10 is rotatably connected to the support rod frame 4, and the front portion of the seat frame 10 can be relatively slidably connected to the lower push rod frame 32 along its own length direction. Here, the front portion of the seat frame 10 is slidably provided with a sliding sleeve 20, and the sliding sleeve 20 is fixedly connected to the lower push rod frame 32.

On the cart frame of this embodiment, the locking mechanism includes a main locking joint 40 arranged between the upper part of the front upper bracket 11, the upper part of the rear upper bracket 21 and the lower part of the lower push rod bracket 32 for relative locking of the three, and a push rod locking joint 30 arranged between the upper push rod bracket 31 and the lower push rod bracket 32 for relative locking of the two. The above-mentioned main locking joint 40 and the push rod locking joint 30 are arranged to be unlocked in a linked manner, and an unlocking operating member 50 for unlocking the push rod locking joint 30 is also arranged on the push rod bracket 3. Here, the unlocking operating member 50 is arranged at the top of the push rod bracket 3.

When the stroller frame is locked in the unfolded state, as shown in Fig. 1 and Fig. 2, the front bracket 1, the rear bracket 2 and the push rod bracket 3 are relatively unfolded, the front upper bracket 11 and the front lower bracket 12 are in a relatively extended state; the rear upper bracket 21 and the rear lower bracket 22 are in a relatively extended state, the front connecting frame 5 and the rear connecting frame 6 are supported between the front bracket 1 and the rear bracket 2 in the front-to-back direction, and the height of the seat frame 10 is at a relatively high position, meeting the use requirements. The stroller frame structure is simple, stable, and has good load-bearing capacity.

When the stroller frame needs to be folded up, as shown in Figure 3, the unlocking operating member 50 is operated to unlock the push rod locking joint 30, driving the main locking joint 40 to be unlocked in linkage, the upper push rod frame 31 itself is first shortened in length and flipped relative to the lower push rod frame 32, and the entire push rod frame 30 is flipped backward, so that the support rod frame 4 is also flipped backward relative to the rear upper bracket 21 around the fourth axis d. In this way, the lower part of the support rod frame 4 moves forward and upward, so that the front connecting frame 5 and the rear connecting frame 6 rotate around the first axis a and gradually close together in the front and rear directions, wherein the rear part of the front connecting frame 5 and the front part of the rear connecting frame 6 move upward respectively, driving the front connecting rod 7 and the rear connecting rod 8 to move upward; subsequently, under the action of the front connecting rod 7 and the rear connecting rod 8, the front upper bracket 11 and the front lower bracket 12, the rear upper bracket 21 and the rear lower bracket 22 are respectively contracted in the length direction, so that the front bracket 1 and the rear bracket 2 are synchronously shortened in length, and the front bracket 1 and the rear bracket 2 gradually move closer together in the front and rear directions.

The cart frame is finally folded as shown in FIG. 4 , with the front bracket 1, the rear bracket 2, the support rod frame 4, the lower push rod frame 32 and the upper push rod frame 31 close to each other in the front-to-back direction, the front connecting frame 5, the rear connecting frame 6, the front connecting rod 7 and the rear connecting rod 8 folded between the front bracket 1 and the rear bracket 2, and the seat frame 10 also folded between the support rod frame 4 and the lower push rod frame 32. The rods are closely close to each other, making the structure of the cart frame in the folded state very compact. In the folded state, the front wheel assembly 60 and the rear wheel assembly 70 are jointly supported on the ground, and the upper end of the upper push rod frame 31 is not higher than the top of the front bracket 1 and the rear bracket 2. The overall height after folding is very small, and it is easy to carry and store.

Example 2

Referring to the stroller shown in FIGS. 5 to 8 , the difference between the stroller frame and the embodiment 1 is mainly that: in the embodiment, the front connecting frame 5 has two groups of front side rods 52 respectively arranged on the left and right sides and extending in the front-back direction, the rear connecting frame 6 has two groups of rear side rods 62 respectively arranged on the left and right sides and extending in the front-back direction, and the front connecting rod 7 and the rear connecting rod 8 each have two groups respectively arranged on the left and right sides. On the left and right sides of the stroller frame, the middle part of the front side rod 52 and the rear side rod 62 are rotatably connected, the front part of the front side rod 52 is rotatably connected to the front upper bracket 11 on the same side, and the rear part of the rear side rod 62 is rotatably connected to the rear upper bracket 21 on the same side. The sliding member 9 at the lower part of the support rod frame 4 is slidably arranged on the rear side rod 62. The front connecting rod 7 is rotatably connected between the front lower bracket 12 and the front part of the rear side rod 62, and the rear connecting rod 8 is rotatably connected between the rear lower bracket 22 and the rear part of the front side rod 52. In this embodiment, a sliding sleeve cross bar 201 is further fixedly disposed between the sliding sleeves 20 on both sides to provide lateral auxiliary support for the seat frame 10 .

The folding principle of the cart frame is similar to that of the cart frame of Example 1, which will not be described again here. The folded cart frame is shown in FIG8 , and its size is also very small.

The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims (14)

1. A stroller for children, comprising a stroller frame having an unfolded state and a folded state, a front wheel assembly provided at the front bottom of the stroller frame, a rear wheel assembly provided at the rear bottom of the stroller frame, and a locking mechanism for locking the stroller frame in the unfolded state, characterized in that: the stroller frame comprises: A front bracket, comprising a front upper bracket and a front lower bracket that are relatively slidable and telescopic along the length direction; A rear bracket, comprising a rear upper bracket and a rear lower bracket that are relatively slidable and retractable along the length direction; A push rod frame, comprising a lower push rod frame, an upper push rod frame whose lower part is rotatably connected to the upper part of the lower push rod frame, wherein two of the upper part of the front upper frame, the upper part of the rear upper frame and the lower part of the lower push rod frame are rotatably connected and the third is rotatably connected to one of the two, or the three are rotatably connected together; A connecting frame assembly, comprising a front connecting frame and a rear connecting frame respectively arranged along the front-to-back direction, the front connecting frame and the rear connecting frame are rotatably connected to each other, the front portion of the front connecting frame is rotatably connected to the front upper bracket, and the rear portion of the rear connecting frame is rotatably connected to the rear upper bracket; A front connecting rod, one end of which is rotatably connected to the front lower bracket, and the other end of which is rotatably connected to the front portion of the rear connecting frame; A rear connecting rod, one end of which is rotatably connected to the rear lower bracket, and the other end of which is rotatably connected to the rear of the front connecting frame; A support rod frame, the support rod frame is rotatably connected to the rear upper bracket, the upper part of the support rod frame is rotatably connected to the lower part of the upper push rod frame, and the lower part of the support rod frame can be relatively rotated and relatively slidably connected to the rear connecting frame along the length extension direction of the rear connecting frame. 2. The stroller according to claim 1 is characterized in that: when the stroller frame is in a folded state, the push rod frame and the support rod frame are flipped and folded at the rear side of the rear bracket, the front connecting frame and the rear connecting frame are relatively rotated and folded, and the front bracket and the rear bracket are respectively shortened in length and folded together in the front-to-back direction. 3. The stroller according to claim 1, characterized in that: when the stroller frame is folded, the front connecting frame and the rear connecting frame rotate relative to each other and fold together in the front-to-back direction, wherein the rear portion of the front connecting frame and the front portion of the rear connecting frame move upward respectively. 4. The stroller according to claim 1 is characterized in that: the front connecting frame and the rear connecting frame are rotatably connected via a first axis, the front connecting rod and the rear connecting frame are rotatably connected via a second axis, the rear connecting rod and the front connecting frame are rotatably connected via a third axis, and when the stroller frame is in an unfolded state, the first axis is located between the second axis and the third axis along the front-to-back direction. 5. The stroller according to claim 1 is characterized in that: the support rod frame is rotatably connected to the rear upper bracket through a fourth axis, the rear part of the rear connecting frame is rotatably connected to the rear upper bracket through a fifth axis, and the fourth axis is located above the fifth axis on the rear upper bracket. 6. The stroller according to claim 1 is characterized in that the upper part of the upper push rod frame is rotatably connected to the lower push rod frame through a sixth axis, the upper part of the support rod frame is rotatably connected to the lower part of the lower push rod frame through a seventh axis, and the sixth axis and the seventh axis are two axes whose axis center lines are parallel to each other. 7. The stroller according to claim 1 is characterized in that: the stroller frame also includes a seat frame arranged along the front-to-back direction, the rear portion of the seat frame is rotatably connected to the support rod frame, and the front portion of the seat frame can be relatively slidably connected to the lower push rod frame along its own length direction. 8. The stroller according to claim 1 is characterized in that: the upper part of the front upper bracket, the upper part of the rear upper bracket and the lower part of the lower push rod bracket are rotatably connected together around the same rotation center line, and the locking mechanism includes a main locking joint arranged between the upper part of the front upper bracket, the upper part of the rear upper bracket and the lower part of the lower push rod bracket for relative locking of the three, and a push rod locking joint arranged between the upper push rod bracket and the lower push rod bracket for relative locking of the two, the main locking joint and the push rod locking joint are arranged to be unlocked in a linked manner, and the push rod bracket is also provided with an unlocking operating member for unlocking the push rod locking joint. 9. The stroller according to claim 1 is characterized in that: the front wheel assembly is arranged at the bottom of the front lower bracket, the rear wheel assembly is arranged at the bottom of the rear lower bracket, when the stroller frame is in a folded state, the front wheel assembly and the rear wheel assembly are jointly supported on the ground, and the upper end of the upper push rod frame is not higher than the top ends of the front bracket and the rear bracket. 10. The stroller according to any one of claims 1 to 9, characterized in that: the stroller frame includes two groups of side brackets respectively arranged on the left and right sides, the side bracket on each side includes the front bracket, the rear bracket, the push rod bracket and the support rod bracket, and the front connecting frame, the rear connecting frame, the front connecting rod and the rear connecting rod are arranged between the two groups of side brackets. 11. The stroller according to claim 10 is characterized in that: the front connecting frame has two front side rods respectively arranged on the left and right sides and extending along the front-to-back direction, the rear connecting frame has two rear side rods respectively arranged on the left and right sides and extending along the front-to-back direction, on the left and right sides of the stroller frame, the front side rods are rotatably connected to the rear side rods, the front part of the front side rods is rotatably connected to the front upper bracket on the same side, and the rear part of the rear side rods is rotatably connected to the rear upper bracket on the same side. 12. The stroller according to claim 11, characterized in that: the front connecting rod and the rear connecting rod each have two groups arranged on the left and right sides, and on the left and right sides of the stroller frame, the front connecting rod is rotatably connected between the front lower bracket and the front part of the rear side rod, and the rear connecting rod is rotatably connected between the rear lower bracket and the rear part of the front side rod. 13. The stroller according to claim 11 is characterized in that: the front connecting frame also has a front connecting rod extending in the left-right direction and located between the rear portions of the two front side rods, the rear connecting frame also has a rear connecting rod extending in the left-right direction and located between the front portions of the two rear side rods, a front cross bar is arranged between the front lower brackets on both sides, a rear cross bar is arranged between the rear lower brackets on both sides, the front connecting rod is rotatably arranged between the front cross bar and the rear connecting rod, and the rear connecting rod is rotatably arranged between the rear cross bar and the front connecting rod. 14. The stroller according to claim 11 is characterized in that: the lower part of the support rod frame on each side is rotatably connected to a sliding member, the sliding member can be slidably arranged on the rear side rod along the length extension direction of the rear side rod, and the sliding member is located on the rear side rod behind the rotational connection position of the front side rod and the rear side rod.