CN115783025B - Child cart and seat assembly thereof - Google Patents

Abstract

The present invention relates to a child stroller and a seat assembly of the child stroller. The child stroller comprises a foldable stroller frame, a wheel assembly and a seat assembly arranged on the stroller frame. The stroller frame comprises side brackets located on the left and right sides of the child stroller. The seat assembly comprises seat connecting plates respectively connected to the side brackets on both sides and a seat plate arranged between the seat connecting plates on both sides. The left and right sides of the seat plate are respectively connected to the seat connecting plates on both sides in a sliding manner along the left and right directions of the child stroller. When the child stroller is converted from an unfolded state to a folded state, the side brackets on both sides move closer to each other, driving the seat connecting plates on both sides to slide in a direction close to the seat plate. The folding of the seat assembly is completed by the folding of the stroller frame. The folding operation is simple and convenient. The overall volume of the child stroller after folding is small. In addition, compared with the traditional seat form of a seat rod and a cloth cover, the seat assembly of the present invention is more comfortable for children to ride.

Description

A child stroller and a seat assembly of the child stroller

Technical Field

The invention relates to the field of children's products, and in particular to a child stroller and a seat assembly of the child stroller.

Background Art

Strollers provide convenience for adults to travel with children and engage in outdoor activities. Currently, most strollers are foldable, such as horizontally foldable or vertically foldable. In order to make the folded volume of horizontally foldable strollers small, the seat is usually supported only by a seat pole with a cloth cover on the seat pole, which is not comfortable, or the seat is directly grafted on the stroller frame, which needs to be removed when folding, which is inconvenient.

Summary of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a child stroller which has good seat comfort and is convenient to fold and has a small volume after folding.

A second object of the present invention is to provide a seat assembly for a child stroller which has good seat comfort and is convenient to fold and has a small volume after folding.

In order to solve the above technical problems, the present invention adopts the following technical solutions:

A child stroller has an unfolded state and a folded state, and comprises a foldable stroller frame, a wheel assembly arranged at the bottom of the stroller frame and a seat assembly arranged on the stroller frame, the stroller frame comprises side brackets located on the left and right sides of the child stroller, the seat assembly comprises seat connecting plates respectively connected to the side brackets on both sides and a seat plate arranged between the seat connecting plates on both sides, the left and right sides of the seat plate are respectively connected to the seat connecting plates on both sides for sliding along the left and right directions of the child stroller, and when the child stroller is converted from the unfolded state to the folded state, the side brackets on both sides move closer to each other, driving the seat connecting plates on both sides to slide in a direction close to the seat plate.

According to some implementation aspects of the present invention, when the child stroller is in the unfolded state, the seat plate is located between the seat connecting plates on both sides and above the seat connecting plates on both sides.

According to some implementation aspects of the present invention, when the child stroller is in a folded state, the seat connecting plates on both sides are close to the seat plate, and the seat connecting plates on both sides are folded under the seat plate.

According to some implementation aspects of the present invention, a slide groove unit is provided on one of the seat connecting plate and the seat plate in the left-right direction, and a slider unit slidably connected to the slide groove unit is provided on the other component.

Furthermore, the slide groove unit includes one or more T-slots respectively arranged on the upper surface of the seat connecting plate on each side along the left and right directions of the stroller, and the slider unit includes a T-block arranged on the lower surface of the seat plate and capable of slidingly connecting with one or more T-slots on the seat connecting plate on each side.

According to some preferred embodiments of the present invention, the slide groove unit also includes one or more strip grooves respectively arranged on the seat connecting plate on each side along the left and right directions of the child stroller and passing through the upper and lower surfaces of the seat connecting plate on the corresponding side, and the slider unit also includes a columnar block arranged on the seat plate and capable of slidingly connecting with one or more strip grooves on the seat connecting plate on each side.

Furthermore, a plurality of T-shaped slots are arranged on the seat connecting plate on each side, and the plurality of T-shaped slots are sequentially distributed along the front-to-back direction of the child stroller, and the strip slot is arranged between two adjacent T-shaped slots.

According to some implementation aspects of the present invention, the side brackets on each side include at least a seat bar extending along the front-rear direction of the child stroller, and the seat connecting plate on each side is connected to the seat bar on the corresponding side.

Furthermore, the stroller frame also includes one or more telescopic rod assemblies arranged between the side brackets on both sides, each of the telescopic rod assemblies includes a first telescopic rod extending along the left-right direction of the child stroller and a second telescopic rod slidably connected to the first telescopic rod along the length direction of the first telescopic rod, one end of the first telescopic rod and one end of the second telescopic rod are respectively connected to the side brackets on both sides, the other end of the first telescopic rod and the other end of the second telescopic rod are slidably connected, the first telescopic rod and the second telescopic rod of at least one telescopic rod assembly are respectively connected to the seat rods on both sides, and the seat connecting plates on both sides are also connected to the first telescopic rod and the second telescopic rod connected to the seat rods on both sides.

According to some implementation aspects of the present invention, the cart frame further includes a transverse bracket rotatably disposed between the side brackets on both sides.

Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

When the child stroller of the present invention is converted from an unfolded state to a folded state, the side brackets on both sides are brought close to each other, driving the seat connecting plates on both sides to slide in the direction close to the seat plate, so that the seat connecting plates on both sides are brought close to the seat plate, and the folding of the seat assembly is completed by the folding of the stroller frame. The folding operation is simple and convenient, and the overall volume of the child stroller after folding is small. In addition, compared with the traditional seat form of the seat rod and the cloth cover, the seat assembly of the present invention is more comfortable for children to sit.

BRIEF DESCRIPTION OF THE DRAWINGS

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

FIG2 is a side view of the child stroller of FIG1 in an unfolded state;

FIG3 is a perspective view of the child stroller of FIG1 in a semi-folded state;

FIG4 is a side view of the child stroller of FIG1 in a semi-folded state;

FIG5 is a side view of the child stroller of FIG1 in a folded state;

FIG6 is a perspective view of the child stroller of FIG1 in a folded state;

FIG7 is a three-dimensional view of the child stroller of FIG6 at another angle;

FIG8 is a perspective view of the seat assembly of the child stroller of FIG1 in an unfolded state;

FIG9 is a perspective view of the seat assembly of the child stroller of FIG1 in a folded state;

FIG10 is a perspective view of the seat assembly of FIG9 from another angle;

FIG11 is a front view of the backrest structure of the stroller of FIG1 in an unfolded state;

FIG12 is a front view of the backrest structure of the stroller of FIG1 in a semi-folded state;

FIG13 is a front view of the backrest structure of the stroller of FIG1 in a folded state;

FIG. 14 is a three-dimensional view of the child stroller of Embodiment 2 in the unfolded state.

In the figure: 100, seat assembly; 200, stroller frame; 300, front wheel assembly; 400, rear wheel assembly; 500, backrest structure;

1. Seat connecting plate; 1a. Sleeve part; 2. Seat plate; 3. T-slot; 4. T-block; 5. Strip groove; 6. Column block; 7. Front wheel bracket; 8. Rear wheel bracket; 9. Push rod; 10. Seat rod; 11. Handrail rod; 12. Frame connecting rod; 13. Frame support rod; 14. Sliding sleeve; 15. First cross bar; 16. Second cross bar; 17. First telescopic rod; 18. Second telescopic rod; 19. Backrest connecting plate; 20. Backrest plate; 21. First slide groove; 22. Second slide groove; 23. Third slide groove; 24. First rotating shaft; 25. First connecting member; 26. Second connecting member; 27. First backrest connecting rod; 28. Second backrest connecting rod; 29. Third connecting member; 30. Fourth connecting member; 31. Second rotating shaft.

DETAILED DESCRIPTION

The present invention is further described below with reference to the accompanying drawings and specific embodiments:

The child stroller as shown in FIGS. 1 to 13 has an unfolded state and a folded state, and includes a foldable stroller frame 200, a wheel assembly disposed at the bottom of the stroller frame 200, and a seat assembly 100 disposed on the stroller frame 200. The wheel assembly includes a front wheel assembly 300 disposed at the front of the bottom of the stroller frame 200 and a rear wheel assembly 400 disposed at the rear of the bottom of the stroller frame 200. The stroller frame 200 includes side brackets located on the left and right sides of the child stroller.

As shown in Fig. 1, Fig. 7 and Fig. 8 to Fig. 10, the seat assembly 100 includes a seat connecting plate 1 connected to the side brackets on both sides and a seat plate 2 arranged between the seat connecting plates 1 on both sides. The left and right sides of the seat plate 2 are respectively connected to the seat connecting plates 1 on both sides in a sliding manner along the left and right directions of the child stroller. When the child stroller is converted from an unfolded state to a folded state, the side brackets on both sides move closer to each other, driving the seat connecting plates 1 on both sides to slide toward the direction close to the seat plate 2. The seat assembly 100 is folded by folding the stroller frame 200. No additional operation is required to fold the seat assembly 100. The folding operation is simple and convenient. The unfolding of the seat assembly 100 can also be completed by unfolding the stroller frame 200.

Referring to Figures 1 and 8, when the child stroller is in the unfolded state, the seat plate 2 is located between and above the seat connecting plates 1 on both sides; referring to Figures 7 and 9-10, when the child stroller is in the folded state, the seat connecting plates 1 on both sides are close to the seat plate 2, and the seat connecting plates 1 on both sides are folded under the seat plate 2.

In this example, a slide groove unit is arranged on the seat connecting plates 1 on both sides along the left-right direction, and a slider unit is arranged on the seat plate 2 to be slidably connected with the slide groove unit. Specifically, the slide groove unit includes a plurality of T-slots 3 respectively arranged on the upper surface of the seat connecting plate 1 on each side along the left-right direction of the child stroller, and the slider unit includes a T-block 4 arranged on the lower surface of the seat plate 2 and capable of being slidably connected with the plurality of T-slots 3 on the seat connecting plate 1 on each side. The plurality of T-slots 3 on the seat connecting plate 1 on each side are distributed sequentially along the front-rear direction of the child stroller.

The slide groove unit also includes a plurality of strip grooves 5 which are respectively arranged on the seat connecting plate 1 on each side along the left-right direction of the stroller and penetrate the upper and lower surfaces of the seat connecting plate 1 on the corresponding side. The slider unit also includes a columnar block 6 which is arranged on the seat plate 2 and can be slidably connected with the plurality of strip grooves 5 on the seat connecting plate 1 on each side. On each side of the seat connecting plate 1, a strip groove 5 is arranged between two adjacent T-slots 4.

The structure of the stroller frame 200 of this example is shown in Figures 1 to 7. Specifically, the side bracket on each side includes a front wheel bracket 7 with a front wheel assembly 300 at the lower part, a rear wheel bracket 8 with a rear wheel assembly 400 at the lower part, a push rod 9, a seat rod 10 extending along the front-to-back direction of the child stroller, a handrail rod 11 extending obliquely from bottom to top along the front-to-back direction of the child stroller, a frame connecting rod 12 extending obliquely from bottom to top along the front-to-back direction of the child stroller, a frame support rod 13 extending along the up-and-down direction of the child stroller, and a sliding sleeve 14 slidably connected to the seat rod 10 along the length direction of the seat rod 10, wherein the push rod 9 includes a lower push rod 9a, an upper push rod 9b whose lower part is pivotally connected to the upper part of the lower push rod 9a, and a push handle rod 9c whose one end is pivotally connected to the upper part of the upper push rod 9b, and the other ends of the push handle rods 9c of the side brackets on both sides are pivotally connected.

In the side brackets on each side, the upper end of the front wheel bracket 7, the front end of the seat rod 10, and the lower end of the handrail rod 11 are rotatably connected through the first pivot; the upper part of the front wheel bracket 7 is also rotatably connected to the lower part of the frame connecting rod 12 through the second pivot; the lower end of the lower push rod 9a, the upper end of the frame connecting rod 12, and the upper end of the frame support rod 13 are rotatably connected through the third pivot, and the lower part of the lower push rod 9a is also rotatably connected to the upper end of the handrail rod 11 through the fourth pivot; the rear part of the seat rod 10 is rotatably connected to the middle part of the frame support rod 13 through the fifth pivot; the lower part of the frame support rod 13 is rotatably connected to the middle part of the rear wheel bracket 8 through the sixth pivot; the upper end of the rear wheel bracket 8 is rotatably connected to the sliding sleeve 14 through the seventh pivot. When the child stroller is in the unfolded state, the first pivot, the second pivot, the third pivot, the fourth pivot, the fifth pivot, the sixth pivot, and the seventh pivot extend in the left and right directions of the child stroller respectively.

As shown in Figure 3, the cart frame 200 also includes a cross bracket rotatably arranged between the side brackets on both sides, the cross bracket includes a first cross bar 15 and a second cross bar 16 cross-rotatably connected to the first cross bar 15 through an eighth pivot, one end of the first cross bar 15 and one end of the second cross bar 16 are respectively rotatably connected to the upper part of the rear wheel bracket 8 on both sides through a first connecting member 25, the other end of the first cross bar 15 and the other end of the second cross bar 16 are respectively rotatably connected to the rear end of the seat rod 10 on both sides through a second connecting member 26, and the first connecting member 25, the sliding sleeve 14 and the rear wheel bracket 8 are all rotatably connected through the seventh pivot, the second connecting member 26, the seat rod 10 and the frame support rod 13 are all rotatably connected through the fifth pivot, and the sliding sleeve 14 is located between the first pivot and the fifth pivot.

In order to make the stroller more stable in folding operation and avoid the side brackets on both sides from twisting when folding horizontally, as shown in FIG3 , the stroller frame 200 also includes one or more telescopic rod assemblies arranged between the side brackets on both sides. In this example, the telescopic rod assembly is arranged between the front wheel brackets 7 on both sides, and the telescopic rod assembly includes a first telescopic rod 17 extending in the left-right direction of the stroller and a second telescopic rod 18 slidably connected to the first telescopic rod 17 along the length direction of the first telescopic rod 17. One end of the first telescopic rod 17 and one end of the second telescopic rod 18 are respectively fixedly connected to the upper ends of the front wheel brackets 7 on both sides, and the other end of the first telescopic rod 17 and the other end of the second telescopic rod 18 are slidably connected. The front end of the seat rods 10 on both sides is rotatably sleeved on the first telescopic rod 17 or the second telescopic rod 18 on the corresponding side, and the rear end of the seat connecting plates 1 on both sides is fixedly connected to the rear end of the seat rods 10 on both sides. The front end of the seat connecting plates 1 on both sides has a sleeve portion 1a, and the sleeve portion 1a of the seat connecting plates 1 on both sides is rotatably sleeved on the first telescopic rod 17 and the second telescopic rod 18 on both sides. In other embodiments, the front end of the seat connecting plate 1 on both sides may also be connected to the front end of the seat rod 10 on both sides. In other embodiments, a telescopic rod assembly may also be provided between the rear wheel brackets 8 or the frame braces 13 on both sides.

The stroller further comprises a backrest structure 500 arranged between the side brackets. The backrest structure 500 can adopt the existing backrest form of backrest rod and cloth cover, and can also adopt the backrest structure as shown in Figures 1 and 11 to 13, so that the passengers can lean back more comfortably.

Specifically, as shown in FIG. 1 and FIG. 11 to FIG. 13 , the backrest structure 500 includes backrest connecting plates 19 respectively disposed on the frame stays 13 on both sides, a backrest connecting rod assembly connected between the backrest connecting plates 19 on both sides, and a backrest plate 20 .

The backrest connecting rod assembly includes a first backrest connecting rod 27 and a second backrest connecting rod 28 which is cross-rotated with the first backrest connecting rod 27 via a first rotating shaft 24. One end of the first backrest connecting rod 27 and one end of the second backrest connecting rod 28 are respectively pivotally connected to the backrest connecting plates 19 on both sides. The other end of the first backrest connecting rod 27 and the other end of the second backrest connecting rod 28 are respectively rotated with the backrest connecting plates 19 on both sides and slidably connected along a first sliding direction. The first sliding direction is an up and down extension direction.

The left and right sides of the backrest plate 20 are respectively connected to the backrest connecting plates 19 on both sides in a sliding direction. The second sliding direction is an up-down and left-right oblique extension direction along the child stroller. In this example, the second sliding direction is a direction extending from top to bottom and obliquely extending from the inner side to the outer side of the child stroller. When the child stroller is converted from the unfolded state to the folded state, the side brackets on both sides are brought closer to each other, driving the backrest connecting plates 19 on both sides to come closer. The backrest structure 500 is folded by the folding of the stroller frame 200. There is no need to fold the backrest structure 500 separately. The folding operation is simple and convenient. The unfolding of the backrest structure 500 can also be carried out by relying on the unfolding of the stroller frame 200.

In this example, the other end of the first backrest connecting rod 27 and the other end of the second backrest connecting rod 28 are respectively connected to the backrest connecting plates 19 on both sides by rotating and sliding through the second rotating shaft 31. The backrest connecting plates 19 on both sides are provided with first sliding grooves 21 along the first sliding direction, and the second rotating shaft 31 passes through the first sliding grooves 21; the left and right sides of the backrest plate 20 are provided with second sliding grooves 22 along the second sliding direction, and the backrest connecting plates 19 on both sides are respectively provided with third connecting members 29, and the third connecting members 29 on both sides respectively pass through the second sliding grooves 22 on the corresponding sides. When the stroller is in the unfolded state, the backrest connecting plates 19 on both sides are located behind the backrest plate 20, and the backrest connecting rod assembly is located behind the backrest connecting plates 19 on both sides.

On each side of the backrest connecting plate 19, the connection between the backrest plate 20 and the backrest connecting plate 19 (i.e., the third connecting member 29), and the connection between the other end of the first backrest link 27 or the other end of the second backrest link 28 and the backrest connecting plate 19 (i.e., the second rotating shaft 31) are respectively located above the connection between one end of the first backrest link 27 or one end of the second backrest link 28 and the backrest connecting plate 19.

In order to increase the stability of the backrest board 20 of the backrest structure 500, in this example, referring to FIG. 1 and FIG. 11 to FIG. 13, a third slide groove 23 is provided on the left and right sides of the backrest board 20 along the second sliding direction, and a fourth connecting member 30 is provided at the position corresponding to the third slide groove 23 on the backrest connecting plates 19 on both sides, and the fourth connecting member 30 passes through the third slide groove 23. In other embodiments, in order to increase the stability of the backrest board 20 of the backrest structure 500, a fourth slide groove may be provided on the backrest board along the first sliding direction, and the first rotating shaft passes through the fourth slide groove, or the backrest structure further includes a backrest support rod assembly located behind the backrest board, the backrest support rod assembly includes a first backrest support rod and a second backrest support rod having one end pivotally connected to one end of the first backrest support rod, and the other end of the first backrest support rod and the other end of the second backrest support rod are respectively pivotally connected to the backrest connecting plates on both sides.

When the stroller is in the unfolded state, the backrest structure 500 is unfolded, as shown in Figures 1 and 11, the second shaft 31 is located at the lower end of the first slide groove 21, the third connecting member 29 is located at the lower end of the second slide groove 22, and the fourth connecting member 30 is located at the lower end of the third slide groove 23; as shown in Figure 12, when the stroller is folded, the side brackets on both sides are close to each other, driving the backrest connecting plates 19 on both sides to move inwardly along the left and right directions of the stroller, respectively, driving the second shaft 31 to slide in the first slide groove 21 from the lower end of the first slide groove 21 to the upper end of the first slide groove 21, and the third connecting member 29 is in the second slide groove 22 from the lower end of the second slide groove 22 to the fourth slide groove 23. The upper end of the second slide groove 22 slides, and the fourth connecting member 30 slides in the third slide groove 23 from the lower end of the third slide groove 23 to the upper end of the third slide groove 23, so that the backrest board 20 slides from top to bottom and approaches the backrest connecting plates 19 on both sides, and finally completes the folding of the backrest structure 500. After folding, as shown in Figure 13, the backrest connecting plates 19 on both sides are close to the backrest boards 20, the first backrest connecting rod 27 and the second backrest connecting rod 28 are close to each other and close to the backrest connecting plates 19 on both sides, the second rotating shaft 31 is located at the upper end of the first slide groove 21, the third connecting member 29 is located at the upper end of the second slide groove 22, and the fourth connecting member 30 is located at the upper end of the third slide groove 23.

In order to make the angle of the backrest structure 500 adjustable, the bottoms of the backrest connecting plates 19 on both sides are rotatably disposed on the frame support rods 13 on the corresponding sides.

In this example, the bottom of the backrest connecting plate 19 of the backrest structure 500 is rotatably connected to the frame support rod 13 on the corresponding side through a backrest adjustment mechanism, and the specific structure of the backrest adjustment mechanism can adopt the existing backrest adjustment mechanism. In other embodiments, the backrest structure 500 can also be rotatably connected to the push rod 9 or other rods on the corresponding side through the backrest adjustment mechanism.

In this example, when the stroller is folded, the upper push rod 9b is folded toward the rear of the stroller and brought close to the lower push rod 9a, and then the lower push rod 9a and the upper push rod 9b are flipped forward together, and the backrest structure 500 is flipped backward, as shown in Figures 3 and 4. In the longitudinal direction: the upper end of the handrail rod 11, the upper end of the frame connecting rod 12 and the upper end of the frame support rod 13 are flipped toward the rear wheel bracket 8 and brought close to the rear wheel bracket 8 respectively, the frame connecting rod 12 pulls the front wheel bracket 7 to move close to the rear wheel bracket 8, and the rear end of the seat rod 10 is flipped downward and brought close to the rear wheel bracket 8 under the movement of the frame support rod 13, and at the same time, the rear wheel bracket 8 drives the sliding sleeve 14 on the seat rod 10 from the rear of the seat rod 10 to the front of the seat rod 10. Slide in the direction to complete the longitudinal folding; on the other hand, transverse folding: the rear wheel bracket 8 drives the sliding sleeve 14 to slide on the seat rod 10 from the rear part of the seat rod 10 to the front part of the seat rod 10, driving one end of the first cross bar 15 and one end of the second cross bar 16 to move forward, so that the first cross bar 15 and the second cross bar 16 are close to each other, and at the same time, the first telescopic rod 17 and the second telescopic rod 18 are telescopic, slid and folded, and the push handle rod 9c of each side bracket is folded and closed, and the backrest connecting plates 19 on both sides are respectively closed to each other inward along the left and right directions of the child stroller, driving the backrest board 20 to close to the backrest connecting plates 19 on both sides, and at the same time, the seat board connecting plates 1 on both sides slide in the direction close to the seat board 2, and finally completing the transverse folding. After the child stroller is folded longitudinally and transversely, as shown in Figures 5 to 7, the front wheel bracket 7, the rear wheel bracket 8, the lower push rod 9a, the upper push rod 9b, the seat rod 10, the handrail rod 11, the frame connecting rod 12, the frame support rod 13, the backrest structure 500 and the seat assembly 100 are close to each other, and the whole stroller is small in size and easy to carry.

The seat assembly 100 and the backrest structure 500 are folded by folding the cart frame 200, and there is no need to fold the seat assembly 100 or the backrest structure 500 separately, so the folding operation is simple and convenient. The seat assembly 100 and the backrest structure 500 can also be unfolded by unfolding the cart frame 200.

In other embodiments, the structure of the cart frame 200 may also adopt other cart frame structures that can be folded laterally.

Example 2

The seat assembly 100 of the child stroller provided in this embodiment is a seat assembly as shown in FIG. 14 , which is different from the seat assembly of Embodiment 1 in that:

The slide unit includes a T-slot 3 arranged on the upper surface of each seat connecting plate 1 along the left and right directions of the stroller, and the slider unit includes a T-block 4 arranged on the lower surface of the seat plate 2 and capable of slidingly connecting with the T-slot 3 on each seat connecting plate 1.

The slide groove unit also includes a strip groove 5 which is arranged on each side seat connecting plate 1 along the left and right direction of the stroller and passes through the upper and lower surfaces of the seat connecting plate 1 on the corresponding side. The slider unit also includes a columnar block 6 which is arranged on the seat plate 2 and can be slidably connected with the strip groove 5 on each side seat connecting plate 1.

The above descriptions of up and down, front and back, left and right, etc. are all defined with reference to the directions observed when the child is riding in a stroller. The direction the child's face is facing is front, the direction the child's back is facing is rear, and the left and right sides of the child's body are the left and right directions of this application.

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 this technology to understand the contents of the present invention and implement them accordingly. 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 (8)

1. A stroller for children as claimed in claim 1, wherein the wheel assembly is arranged at a bottom of the stroller frame and a seat assembly is arranged on the stroller frame. The stroller frame comprises side brackets located at left and right sides of the stroller, characterized in that the seat assembly comprises seat connecting plates respectively connected to the side brackets at both sides and a seat plate arranged between the seat connecting plates at both sides, the left and right sides of the seat plate are respectively connected to the seat connecting plates at both sides in a sliding groove unit along the left and right directions of the stroller, and the other part is provided with a slider unit slidably connected with the slider unit in cooperation with the slider unit. When the stroller is converted from the unfolded state to the folded state, the side brackets at both sides move closer to each other, driving the seat connecting plates at both sides to slide in a direction close to the seat plate, Among them, when the child stroller is in an unfolded state, the seat plate is located between the seat connecting plates on both sides and above the seat connecting plates on both sides; when the child stroller is in a folded state, the seat connecting plates on both sides are close to the seat plate, and the seat connecting plates on both sides are folded under the seat plate. 2. The stroller according to claim 1 is characterized in that: the slide groove unit includes one or more T-slots respectively arranged on the upper surface of the seat connecting plate on each side along the left and right directions of the stroller, and the slider unit includes a T-block arranged on the lower surface of the seat plate and capable of slidingly connecting with one or more T-slots on the seat connecting plate on each side. 3. The stroller according to claim 2 is characterized in that: the slide groove unit also includes one or more strip grooves respectively arranged on the seat connecting plate on each side along the left and right directions of the stroller and passing through the upper and lower surfaces of the seat connecting plate on the corresponding side, and the slider unit also includes a columnar block arranged on the seat plate and capable of slidingly connecting with one or more strip grooves on the seat connecting plate on each side. 4. The stroller according to claim 3, characterized in that: a plurality of T-slots are arranged on the seat connecting plate on each side, the plurality of T-slots are sequentially distributed along the front-to-back direction of the stroller, and the strip groove is arranged between two adjacent T-slots. 5. The stroller according to any one of claims 1 to 4, characterized in that the side brackets on each side at least include a seat rod extending along the front-to-back direction of the stroller, and the seat connecting plate on each side is connected to the seat rod on the corresponding side. 6. The stroller according to claim 5, characterized in that: the stroller frame also includes one or more telescopic rod assemblies arranged between the side brackets on both sides, each of the telescopic rod assemblies includes a first telescopic rod extending along the left and right directions of the stroller and a second telescopic rod slidably connected to the first telescopic rod along the length direction of the first telescopic rod, one end of the first telescopic rod and one end of the second telescopic rod are respectively connected to the side brackets on both sides, the other end of the first telescopic rod and the other end of the second telescopic rod are slidably connected, the first telescopic rod and the second telescopic rod of at least one telescopic rod assembly are respectively connected to the seat rods on both sides, and the seat connecting plates on both sides are also connected to the first telescopic rod and the second telescopic rod connected to the seat rods on both sides. 7. The child stroller according to any one of claims 1 to 4, characterized in that the stroller frame further comprises a transverse bracket rotatably arranged between the side brackets on both sides. 8. A seat assembly for a child stroller, the child stroller comprising a foldable stroller frame, the seat assembly being arranged on the stroller frame, the stroller frame comprising side brackets located on left and right sides of the child stroller, characterized in that: The seat assembly comprises a seat connecting plate connected to the side brackets on both sides respectively and a seat plate arranged between the seat connecting plates on both sides, the left and right sides of the seat plate are respectively connected to the seat connecting plates on both sides for sliding connection along the left and right directions of the child stroller, a slide groove unit is arranged on one of the seat connecting plate and the seat plate along the left and right directions, and a slider unit is arranged on the other component for sliding connection with the slide groove unit. When the baby stroller is converted from the unfolded state to the folded state, the side brackets on both sides move closer to each other, driving the seat connecting plates on both sides to slide towards the seat plate. Among them, when the child stroller is in an unfolded state, the seat plate is located between the seat connecting plates on both sides and above the seat connecting plates on both sides; when the child stroller is in a folded state, the seat connecting plates on both sides are close to the seat plate, and the seat connecting plates on both sides are folded under the seat plate.