Foldable baby carriage structure

Abstract

The utility model relates to the technical field of child products, and discloses a foldable baby carriage structure, a frame assembly of the foldable baby carriage structure comprises a handle upper pipe, a handle lower pipe, a rear supporting pipe, a rear foot pipe, a front foot pipe and a front foot supporting pipe, and the lower end of the handle upper pipe is rotatably connected with the upper end of the rear supporting pipe to form a first rotating point; the lower end of the handle upper pipe is rotatably connected with the upper end of the handle lower pipe to form a second rotating point, the middle section of the rear supporting pipe is rotatably connected with the middle section of the rear foot pipe to form a third rotating point, and the lower end of the handle lower pipe is rotatably connected with the upper end of the front foot pipe and the upper end of the rear foot pipe to form a fourth rotating point. The lower end of the front foot supporting pipe is rotationally connected with the lower end of the front foot pipe to form a fifth rotating point, and the lower end of the rear supporting pipe is rotationally connected with the upper end of the front foot supporting pipe to form a sixth rotating point. The sitting bag assembly comprises a sitting bag pipe and a sliding sleeve, one end of the sitting bag pipe is rotationally connected with the rear supporting pipe to form a seventh rotating point, and the sliding sleeve is arranged on the sitting bag pipe in a sliding and sleeving mode and connected with the handle lower pipe.

Description

TECHNICAL FIELD

[0001] The utility model relates to children's product technical field especially, a kind of foldable baby carriage structure. BACKGROUND

[0002] Baby carriage is generally set as foldable, can be folded to reduce the space occupied when not using, baby carriage includes frame and seat arranged on frame, seat is assembled on frame, the overall structure of current folding baby carriage is complex, the number of components is much, and when folding frame, seat cannot be effectively stored, resulting in the volume after folding is also larger, not conducive to carrying and storage.

[0003] Therefore, an urgent need for a foldable baby carriage structure to solve the above problems. UTILITY MODEL CONTENT

[0004] The utility model is to provide a kind of foldable baby carriage structure, can simultaneously realize the folding of frame and the storage of seat, to reduce the volume of baby carriage after folding, it is convenient to carry and store.

[0005] As above conception, the technical scheme adopted by the utility model is as follows:

[0006] Provide a kind of foldable baby carriage structure, comprising:

[0007] Frame assembly, including handle upper tube, handle lower tube, rear support pipe, rear foot pipe, front foot pipe and front foot support pipe, the lower end of the handle upper tube is rotatably connected with the upper end of the rear support pipe to form a first rotation point, the lower end of the handle upper tube is rotatably connected with the upper end of the handle lower tube to form a second rotation point, the middle segment of the rear support pipe is rotatably connected with the middle segment of the rear foot pipe to form a third rotation point, the lower end of the handle lower tube is rotatably connected with the upper end of the front foot pipe and the upper end of the rear foot pipe to form a fourth rotation point, the lower end of the front foot support pipe is rotatably connected with the lower end of the front foot pipe to form a fifth rotation point, the lower end of the rear support pipe is rotatably connected with the upper end of the front foot support pipe to form a sixth rotation point;

[0008] Seat assembly, including seat pipe and sliding sleeve, one end of the seat pipe is rotatably connected with the rear support pipe to form a seventh rotation point, the sliding sleeve is slidably sleeved on the seat pipe and connected with the handle lower tube.

[0009] Optionally, first connecting piece is arranged on the side of the handle lower tube towards the seat assembly, the sliding sleeve includes sleeve and first connecting protrusion, the sleeve is slidably sleeved on the seat pipe, the first connecting protrusion is arranged on the outer periphery of the sleeve and towards the first connecting piece, and the first connecting protrusion is connected with the first connecting piece.

[0010] Optionally, the sliding sleeve further comprises a second connecting protrusion arranged on the outer periphery of the sleeve and away from the lower tube of the handle, the sliding sleeve and the seat tube each have two oppositely arranged second connecting protrusions, and the seat assembly further comprises a connecting rod, two ends of the connecting rod being connected with the second connecting protrusions of the two sliding sleeves respectively.

[0011] Optionally, the seat assembly further comprises a leg rest tube, the leg rest tube being connected with the other end of the seat tube and facing the front tube, and a plane on which the leg rest tube is arranged being arranged at an angle with a plane on which the seat tube is arranged.

[0012] Optionally, the frame assembly further comprises a second connecting member, the second connecting member being sleeved on the lower end of the upper tube of the handle and having a first rotating part and a second rotating part arranged at intervals, the first rotating part being rotatably connected with the upper end of the rear support tube at the first rotating point, and the second rotating part being rotatably connected with the upper end of the lower tube of the handle at the second rotating point.

[0013] Optionally, the frame assembly further comprises a third connecting member, a fourth connecting member and a fifth connecting member, the third connecting member being sleeved on the lower end of the lower tube of the handle, the fourth connecting member being sleeved on the upper end of the front tube, and the fifth connecting member being sleeved on the upper end of the rear tube, the third connecting member, the fourth connecting member and the fifth connecting member being rotatably connected through a same rotating shaft.

[0014] Optionally, the foldable stroller structure further comprises a front handrail assembly, the front handrail assembly comprising a front handrail and a support member, a middle segment of the front handrail being connected with a middle segment of the lower tube of the handle, an end of the front handrail being rotatably connected with the upper end of the support member, and the lower end of the support member being rotatably connected with the rear support tube.

[0015] Optionally, the front handrail comprises a handrail part and an extension part, the handrail part being connected with the lower tube of the handle, the extension part being arranged on the handrail part and extending towards one side of the rear support tube at a first end, and the first end being rotatably connected with the upper end of the support member.

[0016] Optionally, the foldable stroller structure further comprises a wheel assembly, the wheel assembly comprising a front wheel and a rear wheel, the front wheel being rotatably arranged on the lower end of the front tube, and the rear wheel being rotatably arranged on the lower end of the rear tube.

[0017] Optionally, the foldable stroller structure further comprises a sun canopy assembly, the sun canopy assembly comprising a front canopy rod and a rear canopy rod, an end of the front canopy rod being rotatably connected at the second rotating point, and an end of the rear canopy rod being connected with the upper tube of the handle.

[0018] The foldable stroller structure has the following beneficial effects:

[0019] The foldable baby carriage structure provided by the utility model, comprising a frame assembly and a seat assembly, wherein the frame assembly comprises an upper handle pipe, a lower handle pipe, a rear support pipe, a rear leg pipe, a front leg pipe and a front leg support pipe, the lower end of the upper handle pipe is rotationally connected with the upper end of the rear support pipe to form a first rotation point, the lower end of the upper handle pipe is rotationally connected with the upper end of the lower handle pipe to form a second rotation point, the middle section of the rear support pipe is rotationally connected with the middle section of the rear leg pipe to form a third rotation point, the lower end of the lower handle pipe is rotationally connected with the upper end of the front leg pipe and the upper end of the rear leg pipe to form a fourth rotation point, the lower end of the front leg support pipe is rotationally connected with the lower end of the front leg pipe to form a fifth rotation point, and the lower end of the rear support pipe is rotationally connected with the upper end of the front leg support pipe to form a sixth rotation point. The seat assembly comprises a seat pipe and a sliding sleeve, one end of the seat pipe is rotationally connected with the rear support pipe to form a seventh rotation point, and the sliding sleeve is slidably sleeved on the seat pipe and connected with the lower handle pipe. The upper handle pipe, the lower handle pipe, the rear support pipe and the rear leg pipe form a first four-link structure with the first rotation point, the second rotation point, the third rotation point and the fourth rotation point. The front leg pipe, the front leg support pipe, the rear leg pipe and the rear support pipe form a second four-link structure with the third rotation point, the fourth rotation point, the fifth rotation point and the sixth rotation point. The two four-link structures have the same two rotation points, i.e. the third rotation point and the fourth rotation point, when the first rotation point of the first four-link structure is unlocked and the first four-link structure moves, the second four-link structure can be driven to move through the movement of the third rotation point and the fourth rotation point, so that the frame assembly can be quickly folded. The sliding sleeve slidably sleeved on the seat pipe enables the seat pipe to be accommodated between the rear support pipe and the upper handle pipe, and the volume of the baby carriage after being folded can be further reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic view of the foldable baby carriage structure provided by the utility model embodiment (unfolded state);

[0021] Figure 2 is Figure 1 is an enlarged view of A in FIG. 4;

[0022] Figure 3 is a structural schematic view of the foldable baby carriage structure provided by the utility model embodiment (folded state);

[0023] Figure 4 is a folding process schematic view of the foldable baby carriage structure provided by the utility model embodiment.

[0024] in the drawings:

[0025] 1, frame assembly; 11, upper handle pipe; 12, lower handle pipe; 13, rear support pipe; 14, rear leg pipe; 15, front leg pipe; 16, front leg support pipe;

[0026] 2, seat post assembly; 21, seat post tube; 22, sliding sleeve; 221, sleeve; 222, first connecting protrusion; 223, second connecting protrusion; 23, connecting rod; 24, leg rest tube;

[0027] 3, armrest assembly; 31, front armrest; 311, armrest part; 312, extension part; 32, support piece;

[0028] 4, wheel assembly; 41, front wheel; 42, rear wheel;

[0029] 5, sunroof assembly; 51, front roof bar; 52, rear roof bar;

[0030] 101, first rotation point; 102, second rotation point; 103, third rotation point; 104, fourth rotation point; 105, fifth rotation point; 106, sixth rotation point; 107, seventh rotation point. DETAILED DESCRIPTION

[0031] In order to make the technical problems solved by the utility model, the technical scheme adopted and the technical effects reached more clear, the technical scheme of the utility model will be further explained below in combination with the drawings and through specific embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, not to limit the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for the convenience of description, not all.

[0032] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0033] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0034] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0035] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0036] like Figures 1 to 4 As shown, this embodiment provides a foldable baby stroller structure, including a frame assembly 1 and a seat assembly 2, wherein the frame assembly 1 includes a handlebar upper tube 11, a handlebar lower tube 12, a rear support tube 13, a rear leg tube 14, a front leg tube 15 and a front leg support tube 16, the lower end of the handlebar upper tube 11 is rotatably connected to the upper end of the rear support tube 13 to form a first rotation point 101, and the lower end of the handlebar upper tube 11 is rotatably connected to the upper end of the handlebar lower tube 12 to form a second rotation point 102. 02, the middle section of the rear support tube 13 is rotatably connected to the middle section of the rear leg tube 14 to form a third rotation point 103. The lower end of the handlebar lower tube 12 is rotatably connected to the upper ends of the front leg tube 15 and the upper ends of the rear leg tube 14 to form a fourth rotation point 104. The lower end of the front leg support tube 16 is rotatably connected to the lower end of the front leg tube 15 to form a fifth rotation point 105. The lower end of the rear support tube 13 is rotatably connected to the upper end of the front leg support tube 16 to form a sixth rotation point 106. The seat assembly 2 includes a seat tube 21 and a sliding sleeve 22. One end of the seat tube 21 is rotatably connected to the rear support tube 13 to form a seventh rotation point 107. The sliding sleeve 22 is slidably mounted on the seat tube 21 and connected to the handlebar lower tube 12.

[0037] In a specific implementation, the handlebar upper tube 11, the handlebar lower tube 12, the rear support tube 13, and the rear leg tube 14 form a first four-bar linkage structure having a first rotation point 101, a second rotation point 102, a third rotation point 103, and a fourth rotation point 104. When the first rotation point 101 is unlocked, the handlebar upper tube 11 can rotate counterclockwise toward the handlebar lower tube 12, driving the rear support tube 13 connected to its lower end to rotate clockwise toward the side away from the handlebar lower tube 12, and at the same time driving the handlebar lower tube 12 connected to its lower end to rotate clockwise toward the side close to the rear support tube 13. In other words, both the handlebar lower tube 12 and the rear support tube 13 can be folded downward, so that the upper ends of the handlebar lower tube 12 and the rear support tube 13 are folded below the seventh rotation point 107. The front leg tube 15, the front leg support tube 16, the rear leg tube 14, and the rear support tube 13 form a second four-bar linkage structure having a third rotation point 103, a fourth rotation point 104, a fifth rotation point 105, and a sixth rotation point 106. When the rear support tube 13 rotates clockwise to tilt the lower end of the rear support tube 13 above the seventh rotation point 107, the front leg support tube 16 connected to the lower end of the rear support tube 13 is driven to rotate counterclockwise. This causes the upper end of the front leg support tube 16 to continue to move upward toward the fourth rotation point 104, while the lower end of the front leg support tube 16 continues to rotate toward the rear support tube 13, thereby reducing the angle between the front leg support tube 16 and the rear support tube 13, thereby achieving folding and storage of the frame assembly 1. When the rear support tube 13 and the handlebar lower tube 12 are both rotated to a nearly vertical setting, the seat tube 21 rotatably connected to the rear support tube 13 is restricted by the sleeve 221 connected to the handlebar lower tube 12, that is, because the relative positions of the sleeve 221 and the handlebar lower tube 12 always remain fixed, the seat tube 21 rotatably connected to the rear support tube 13 will move along the extension direction of the sleeve 221 as the rear support tube 13 rotates, so that the seat tube 21 is also rotated to a nearly vertical setting, thereby storing the seat tube 21 between the rear support tube 13 and the handlebar upper tube 11, thereby realizing the folding and storage of the seat assembly 2.

[0038] The foldable stroller structure provided in this embodiment has two four-bar linkages with the same two rotation points, namely, third rotation point 103 and fourth rotation point 104. When first rotation point 101 of the first four-bar linkage is unlocked and the first four-bar linkage moves, the movement of third rotation point 103 and fourth rotation point 104 drives the second four-bar linkage to follow, thereby quickly folding the frame assembly 1. The seat assembly 2, via a sliding sleeve 22 that slidably fits over the seat tube 21, allows the seat tube 21 to be stored between the rear support tube 13 and the upper handlebar tube 11, further reducing the size of the folded stroller.

[0039] In this embodiment, the unlocking button is provided on the handlebar upper tube 11, and the unlocking button is used to unlock the first rotation point 101. The unlocking and locking of the first rotation point 101 can adopt a conventional hook lock structure in the art, which will not be described in detail here.

[0040] Alternatively, as Figure 2 As shown, a first connector is provided on the side of the handlebar lower tube 12 facing the seat assembly 2. The sliding sleeve 22 includes a sleeve 221 and a first connecting protrusion 222. The sleeve 221 is slidably mounted on the seat tube 21. The first connecting protrusion 222 is disposed on the outer periphery of the sleeve 221 and faces the first connector. The first connecting protrusion 222 is connected to the first connector. In this embodiment, the first connector is fixed to the handlebar lower tube 12 and has a cylindrical structure extending toward the seat assembly 2. The first connecting protrusion 222 is a cylindrical protrusion adapted therefor. The cylindrical protrusion can be inserted into the inner cavity of the cylindrical structure and connected to the inner cavity wall using a threaded connection or other connection method. The threaded connection between the first connecting protrusion 222 and the first connector facilitates the assembly and disassembly of the seat assembly 2 and the frame assembly 1.

[0041] Optionally, the sliding sleeve 22 further includes a second connecting protrusion 223, which is disposed on the outer periphery of the sleeve 221 and facing away from the handlebar lower tube 12. The sliding sleeve 22 and the seat tube 21 each have two second connecting protrusions 223 disposed opposite each other. The seat assembly 2 further includes a connecting rod 23, the ends of which are respectively connected to the second connecting protrusions 223 of the two sliding sleeves 22. In this embodiment, the second connecting protrusions 223 are hollow cylindrical protrusions. The ends of the connecting rod 23 can be inserted into the second connecting protrusions 223, thereby connecting the connecting rod 23 to the two sliding sleeves 22. When the ends of the connecting rod 23 are inserted into the second connecting protrusions 223, the second connecting protrusions 223 and the connecting rod 23 can be fastened together using fasteners such as screws to ensure the stability of the connection between the sleeve 221 and the connecting rod 23, thereby enhancing the strength of the seat assembly 2.

[0042] Optionally, the seat assembly 2 further includes a leg support tube 24 connected to the other end of the seat tube 21 and oriented toward the front leg tube 15. The leg support tube 24 is disposed at an angle to the plane of the seat tube 21. In this embodiment, the leg support tube 24 is arcuately shaped, with its ends respectively connected to the other ends of the two seat tubes 21 not connected to the rear support tube 13.

[0043] Optionally, the frame assembly 1 further comprises a second connecting member sleeved on the lower end of the handle upper tube 11 and having a first rotating part and a second rotating part arranged at intervals, the first rotating part being rotatably connected to the upper end of the rear support tube 13 at the first rotating point 101, and the second rotating part being rotatably connected to the upper end of the handle lower tube 12 at the second rotating point 102. In the embodiment, the second connecting member is L-shaped, and has a first side and a second side arranged at an angle, the first rotating part being arranged at the end of the first side, and the second rotating part being arranged at the end of the second side. In the folding process of the frame assembly 1, the first side is a segment between the first rotating point 101 and the second rotating point 102 in the first four-bar linkage structure. In specific implementation, the upper end of the rear support tube 13 is sleeved with a first connecting cylinder, the end of the first connecting cylinder is provided with a first rotating hole matched with the first rotating part, and a first rotating shaft is connected to the first rotating part through the first rotating hole. The upper end of the handle lower tube 12 is sleeved with a second connecting cylinder, the end of the second connecting cylinder is provided with a second rotating hole matched with the second rotating part, and a second rotating shaft is connected to the second rotating part through the second rotating hole.

[0044] Optionally, the frame assembly 1 further comprises a third connecting member, a fourth connecting member and a fifth connecting member, the third connecting member being sleeved on the lower end of the handle lower tube 12, the fourth connecting member being sleeved on the upper end of the front leg tube 15, and the fifth connecting member being sleeved on the upper end of the rear leg tube 14, the third connecting member, the fourth connecting member and the fifth connecting member being rotatably connected by the same rotating shaft. In specific implementation, the third connecting member is provided with a third rotating hole, the fourth connecting member is provided with a fourth rotating hole, and the fifth connecting member is provided with a fifth rotating hole, the centers of the third rotating hole, the fourth rotating hole and the fifth rotating hole being collinear, and the same rotating shaft can be used to pass through the third rotating hole, the fourth rotating hole and the fifth rotating hole in sequence, so that the upper end of the front leg tube 15, the upper end of the rear leg tube 14 and the lower end of the handle lower tube 12 can rotate around the same center, i.e. the fourth rotating point 104, thereby reducing the gap between the three after the frame assembly 1 is folded, and reducing the volume of the foldable stroller structure in the folded state.

[0045] Further, the foldable stroller structure further comprises a front handrail assembly 3, the front handrail assembly 3 comprising a front handrail 31 and a support member 32, the middle segment of the front handrail 31 being connected to the middle segment of the handle lower tube 12, the end of the front handrail 31 being rotatably connected to the upper end of the support member 32, and the lower end of the support member 32 being rotatably connected to the rear support tube 13. The connection between the front handrail 31 and the handle lower tube 12 ensures that the relative positions of the two are always unchanged, i.e. ensures that the front handrail 31 will not move during use, thereby ensuring the safety of use. The front handrail 31 is rotatably connected to the rear support tube 13 through the support member 32, which can not only stabilize the connection between the handle upper tube 11 and the rear support tube 13 by using the support member 32, but also avoid interference caused by the rotation of the front handrail assembly 3 to the rear support tube 13.

[0046] Optionally, the front handrail 31 comprises a handrail part 311 connected with the lower handle tube 12 and an extension part 312 provided on the handrail part 311 and extending from a first end thereof toward the side of the rear support tube 13, and the first end is rotationally connected with the upper end of the support piece 32. In this embodiment, the extension part 312 is L-shaped, and the L-shaped extension part 312 comprises a first part and a second part arranged at an angle, the first end of the first part away from the second part is the first end rotationally connected with the support piece 32, and the second part is arranged in overlap with and connected with the handrail part 311 to ensure that the two have sufficient connection abutting surface. At least one mounting hole is arranged on the second part, and a fixing hole corresponding to the mounting hole is arranged on the handrail part 311, and a fastener such as a screw is arranged in the mounting hole and connected with the fixing hole, so that the detachable connection of the handrail part 311 and the extension part 312 is realized.

[0047] Optionally, the foldable stroller structure further comprises a wheel assembly 4, and the wheel assembly 4 comprises front wheels 41 and rear wheels 42, the front wheels 41 are rotationally arranged at the lower ends of the front leg tubes 15, and the rear wheels 42 are rotationally arranged at the lower ends of the rear leg tubes 14. In specific implementation, the front leg tubes 15 must be arranged at least in pairs, and the front wheels 41 are two, one front wheel 41 is rotationally connected with the lower end of one front leg tube 15, and the rear leg tubes 14 must be arranged at least in pairs, and the rear wheels 42 are two, one rear wheel 42 is rotationally connected with the lower end of one rear leg tube 14.

[0048] Optionally, the foldable stroller structure further comprises a sun canopy assembly 5, and the sun canopy assembly 5 comprises a front canopy rod 51 and a rear canopy rod 52, the end of the front canopy rod 51 is rotationally connected at the second rotation point 102, and the end of the rear canopy rod 52 is connected with the upper handle tube 11. When the frame assembly 1 is folded, the upper handle tube 11 is counterclockwise rotated forward, so that the rear canopy rod 52 is close to the front canopy rod 51, to realize the folding of the sun canopy assembly.

[0049] The above embodiments only illustrate the basic principles and characteristics of the present application, and the present application is not limited to the above embodiments. Without departing from the spirit and scope of the present application, various changes and modifications can be made to the present application, and these changes and modifications all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. Foldable stroller structure, characterized in that, The utility model provides a bicycle frame assembly and a seat assembly, the bicycle frame assembly comprises a handlebar upper tube (11), a handlebar lower tube (12), a rear support tube (13), a rear foot tube (14), a front foot tube (15) and a front foot support tube (16), the lower end of the handlebar upper tube (11) is rotatably connected with the upper end of the rear support tube (13) to form a first rotation point (101), the lower end of the handlebar upper tube (11) is rotatably connected with the upper end of the handlebar lower tube (12) to form a second rotation point (102), the middle section of the rear support tube (13) is rotatably connected with the middle section of the rear foot tube (14) to form a third rotation point (103), the lower end of the handlebar lower tube (12) is rotatably connected with the upper end of the front foot tube (15) and the upper end of the rear foot tube (14) to form a fourth rotation point (104), the lower end of the front foot support tube (16) is rotatably connected with the lower end of the front foot tube (15) to form a fifth rotation point (105), and the lower end of the rear support tube (13) is rotatably connected with the upper end of the front foot support tube (16) to form a sixth rotation point (106). The seat assembly comprises a seat tube (21) and a sliding sleeve (22), one end of the seat tube (21) is rotatably connected with the rear support tube (13) to form a seventh rotation point (107), and the sliding sleeve (22) is slidably sleeved on the seat tube (21) and connected with the handlebar lower tube (12). The handlebar lower tube (12) is provided with a first connecting member on the side facing the seat assembly (2), the sliding sleeve (22) comprises a sleeve (221) and a first connecting protrusion (222), the sleeve (221) is slidably sleeved on the seat tube (21), the first connecting protrusion (222) is arranged on the outer periphery of the sleeve (221) and faces the first connecting member, and the first connecting protrusion (222) is connected with the first connecting member.

2. The foldable stroller structure of claim 1, wherein, The sliding sleeve (22) further comprises a second connecting protrusion (223), the second connecting protrusion (223) is arranged on the outer periphery of the sleeve (221) and faces away from the handlebar lower tube (12), the sliding sleeve (22) and the seat tube (21) are both provided with two oppositely arranged second connecting protrusions (223), and the seat assembly (2) further comprises a connecting rod (23), two ends of the connecting rod (23) are connected with the second connecting protrusions (223) of the two sliding sleeves (22) respectively.

3. The foldable stroller structure of claim 2, wherein, The seat assembly (2) further comprises a legrest tube (24), the legrest tube (24) is connected with the other end of the seat tube (21) and faces the front foot tube (15), and the plane in which the legrest tube (24) is arranged is arranged at an angle with the plane in which the seat tube (21) is arranged.

4. The foldable stroller structure of claim 1, wherein, The bicycle frame assembly (1) further comprises a second connecting member, the second connecting member is sleeved on the lower end of the handlebar upper tube (11) and has a first rotating part and a second rotating part which are arranged at intervals, the first rotating part is rotatably connected with the upper end of the rear support tube (13) at the first rotation point (101), and the second rotating part is rotatably connected with the upper end of the handlebar lower tube (12) at the second rotation point (102).

5. The foldable stroller structure of claim 1, wherein, ​ 6. The foldable stroller structure of claim 1, wherein, The frame assembly (1) further comprises a third connecting piece, a fourth connecting piece and a fifth connecting piece, the third connecting piece is sleeved on the lower end of the handlebar lower tube (12), the fourth connecting piece is sleeved on the upper end of the front leg tube (15), and the fifth connecting piece is sleeved on the upper end of the rear leg tube (14), and the third connecting piece, the fourth connecting piece and the fifth connecting piece are rotationally connected through the same rotating shaft.

7. The foldable stroller structure of claim 1, wherein, The foldable stroller structure further comprises a front handrail assembly (3), the front handrail assembly (3) comprises a front handrail (31) and a supporting piece (32), the middle section of the front handrail (31) is connected with the middle section of the handlebar lower tube (12), the end of the front handrail (31) is rotationally connected with the upper end of the supporting piece (32), and the lower end of the supporting piece (32) is rotationally connected with the rear supporting tube (13).

8. A collapsible pushchair structure according to claim 7, wherein, The front handrail (31) comprises a handrail part (311) and an extension part (312), the handrail part (311) is connected with the handlebar lower tube (12), and the extension part (312) is arranged on the handrail part (311) and extends towards one side of the rear supporting tube (13) at a first end, and the first end is rotationally connected with the upper end of the supporting piece (32).

9. The foldable stroller structure of claim 1, wherein, The foldable stroller structure further comprises a wheel assembly (4), the wheel assembly (4) comprises a front wheel (41) and a rear wheel (42), the front wheel (41) is rotationally arranged on the lower end of the front leg tube (15), and the rear wheel (42) is rotationally arranged on the lower end of the rear leg tube (14).

10. The foldable stroller structure of claim 1, wherein, The foldable stroller structure further comprises a sun canopy assembly (5), the sun canopy assembly (5) comprises a front canopy rod (51) and a rear canopy rod (52), the end of the front canopy rod (51) is rotationally connected at the second rotating point (102), and the end of the rear canopy rod (52) is connected with the handlebar upper tube (11).

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