Folding and unfolding structure of stroller

Abstract

The invention discloses a folding and unfolding structure of a stroller, which comprises a back plate, a seat plate and a handle, the end parts of the back plate, the seat plate and the handle are rotationally connected, the folding and unfolding structure further comprises a handle resetting piece and a rotary limiting piece, a back plate locking mechanism is arranged between the back plate and the seat plate, and a shifting piece is arranged on the back plate; a handle locking mechanism and a handle linkage mechanism are arranged between the handle reset piece and the handle and between the handle reset piece and the seat plate, and a seat plate locking mechanism is arranged between the seat plate and the rotary limiting piece. According to the design, the back plate can be rotated downwards to be folded only by shifting a shifting piece, the back plate is rotated downwards to be folded to unlock the handle locking mechanism and the seat plate locking mechanism, the handle is linked to be folded through the handle linkage mechanism, the back plate rotates upwards when unfolded to sequentially drive the handle and the seat plate to be unfolded and form clamping connection, the linkage performance is high, and the use is convenient. The handle and the seat plate do not need to be unlocked or rotated additionally, use is convenient, and operation is easy.

Description

Technical Field

[0001] This invention relates to the field of stroller technology, and in particular to a folding and unfolding structure for a stroller. Background Technology

[0002] Newborn babies cannot walk independently and usually need to be carried by family members when going out. However, holding a baby for a long time can be unbearable for a mother's hands. To free up mothers' hands, strollers are usually purchased to carry the baby. To prevent the baby from falling, strollers are usually equipped with handles. Strollers are relatively large and take up a lot of space when not in use. To facilitate storage, foldable strollers have been invented, reducing their size when folded for easy carrying or storage.

[0003] The folding operation of existing strollers is rather cumbersome. The handle and seat lack a linkage structure, so unfolding or folding requires operating both the seat and backrest, as well as the handle, making them relatively inconvenient. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention provides a folding and unfolding structure for a child stroller. To solve the aforementioned technical problems, this invention provides the following technical solution.

[0005] A folding and unfolding structure for a child stroller includes a back panel, a seat panel, and a handle located between the back panel and the seat panel. The ends of the back panel, seat panel, and handle are rotatably connected, and the back panel, seat panel, and handle can be folded or unfolded by rotation. It also includes a handle reset component mounted on the back plate and moving synchronously with the back plate, and a rotating fixing component locked to the seat plate. The rotating fixing component, the back plate, the seat plate, the handle reset component, and the handle are coaxially rotatably connected from the outside to the inside. A back plate locking mechanism is provided between the back plate and the seat plate. A lever is provided on the back plate. The lever can be moved to unlock the back plate locking mechanism by pulling a rope, which is used for the rotation and folding of the back plate. A handle locking mechanism is provided between the handle reset component and the handles and seat plates located on both sides. The handle is locked by the handle locking mechanism. The handle reset component is rotated to unlock the locked state of the handle locking mechanism for the rotation and folding of the handle. A handle linkage mechanism is also provided between the handle reset component and the handles and seat plate located on both sides. The handle linkage mechanism is used to link the movement of the handle and the handle reset component. When the seat plate is unfolded or folded, the handle is driven to unfold or fold synchronously through the handle linkage mechanism. A seat plate locking mechanism is provided between the seat plate and the rotating fixing member. The seat plate locking mechanism and the rotating fixing member form a lock to restrict the rotation of the seat plate. When the back plate rotates downward, it is linked to the seat plate locking mechanism to unlock for the rotation and folding of the seat plate.

[0006] Furthermore, the handle locking mechanism includes a handle latching pin fixed inside the handle, a handle latching pin movably mounted on the handle latching pin, and a shaft located on the base plate and passing through the handle. The handle latching pin and the handle latching pin rotate synchronously with the handle, and the handle is locked by the engagement of the handle latching pin and the shaft.

[0007] Furthermore, the shaft column is provided with a handle latch fixing groove, and the handle reset component is provided with a boss. The boss is annular and fits against the outer edge of the shaft column. When the back plate is unfolded, the handle latch is fixed in the handle latch fixing groove to restrict the rotation of the handle. When the handle reset component is folded down with the back plate, the boss gradually pushes the handle latch into the handle latch limiting component, and the handle latch disengages from the handle latch fixing groove to release the locked state of the handle. The handle latch is reset by the rebound force of the spring.

[0008] Furthermore, the handle linkage mechanism includes an upper annular groove on the handle reset member, a lower annular groove on the base plate corresponding to the upper annular groove, and a movable paddle located in the upper annular groove. The movable paddle drives the handle to rotate and engages with the handle.

[0009] Furthermore, the end of the movable paddle is provided with a hook, and the handle latching pin limiting component is provided with a latching block adapted to the hook; when folding, the back plate drives the handle reset component to rotate downward, the handle's locking state is released, the hook touches the top of the latching block, and the hook continues to rotate downward to drive the latching block to move for linkage handle folding, and the handle is fixed by the cooperation of the hook and the latching block. When unfolding, first rotate the back plate downwards. The locking block presses against the locking hook, causing the movable lever to move to the lower annular groove. The locking hook disengages from the locking block. Continue rotating downwards to move the locking hook below the locking block. The movable lever resets itself through its own elastic force, causing the locking hook to adhere to the lower part of the locking block. Then rotate the back plate upwards. Its locking hook moves the locking block upwards, linking the unfolding of the handle. After the handle locking pin engages with the handle pin fixing groove, rotate the back plate upwards. The movable lever on the handle reset part deforms through the space of the lower annular groove, causing the locking hook to disengage from the locking block. Continue to pull the back plate upwards. The base plate and back plate reset in sequence and form a locking connection.

[0010] Furthermore, the backplate locking mechanism includes several annularly distributed pin slots at the end of the base plate and a backplate pin installed inside the backplate. The pin slots are located on the side of the base plate close to the backplate. The backplate pin is inserted into the pin slot to lock the backplate. The lever drives the backplate pin to move away from the pin slot through the pull rope to unlock the backplate. After the backplate pin moves, it is re-engaged into the pin slot by the spring's rebound force.

[0011] Furthermore, the seat plate locking mechanism includes a mounting groove on the side of the seat plate near the back plate, a laterally movable rotation limiting member assembled in the mounting groove, and a spring located between the mounting groove and the rotation limiting member. The mounting groove and the contour of the rotation limiting member are adapted to restrict the rotation of the rotation limiting member. The rotation limiting member passes through the back plate and forms a snap-fit ​​with the rotation fixing member to restrict the rotation of the seat plate.

[0012] Furthermore, the rotating limiting component is provided with a protruding buckle, and the rotating fixing component is provided with a slot adapted to the buckle. The buckle is disengaged from the slot by the lateral movement of the rotating fixing component to achieve unlocking.

[0013] Furthermore, the rotating limiting member has rotating limiting member bosses on both sides, and the back plate has back plate bosses on both sides; the back plate bosses have inclined guide surfaces on both sides, and the rotating limiting member bosses have inclined guide surfaces on both sides. When the back plate rotates, the back plate bosses also rotate. The guide surfaces on the back plate bosses gradually move along the guide surfaces. The back plate bosses rotate to below the rotating limiting member bosses and push up the rotating limiting member, realizing the lateral movement of the rotating limiting member. The rotating limiting member drives the buckle to disengage from the slot, and the locking of the seat plate is released.

[0014] Furthermore, an extension plate is provided at the front end of the seat plate, and the extension plate is rotatably connected to the seat plate.

[0015] Compared with the prior art, the beneficial effects that this invention can achieve are: Traditional strollers have locking mechanisms for the back panel, seat, and handle, requiring sequential unlocking of each mechanism before folding, which is cumbersome. This invention, however, only requires moving a lever to release the back panel's lock, allowing it to fold downwards. As the back panel rotates downwards, the handle's reset mechanism rotates synchronously, releasing the handle's locking mechanism. Simultaneously, the back panel's downward rotation also unlocks the seat's locking mechanism. The downward folding of the back panel is then linked to the handle via a linkage mechanism, eliminating the need for additional handle unlocking or folding operations. Similarly, when the back panel is rotated upwards to unfold, the handle also unfolds via the linkage mechanism. Upon unfolding, the handle, back panel, and seat locking mechanisms lock in place, requiring no additional locking steps. This design features a highly interconnected folding and unfolding structure, offering ease of use and simple operation, meeting the user's daily convenience needs. Attached Figure Description

[0016] Figure 1 The three-dimensional representation of the present invention Figure 1 .

[0017] Figure 2 The three-dimensional representation of the present invention Figure 2 .

[0018] Figure 3 The three-dimensional representation of the present invention Figure 3 .

[0019] Figure 4 For the explosion of the present invention Figure 1 .

[0020] Figure 5 For the explosion of the present invention Figure 2 .

[0021] Reference numerals: 1. Back plate, 2. Seat plate, 3. Handle, 4. Paddle, 5. Extension plate, 6. Handle reset component, 7. Rotating fixing component, 8. Back plate locking mechanism, 9. Boss, 10. Handle locking mechanism, 11. Seat plate locking mechanism, 12. Pin slot, 13. Back plate pin, 14. Handle latch limiting component, 15. Handle latch, 16. Shaft, 17. Handle latch fixing groove, 18. Upper annular groove, 19. Lower annular groove, 20. Movable paddle, 21. Hook, 22. Block, 23. Mounting groove, 24. Rotating limiting component, 25. Buckle, 26. Slot, 27. Rotating limiting component boss, 28. Back plate boss, 29. Guide surface, 30. Guide surface, 31. Handle linkage mechanism. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] like Figure 1-5 As shown, a folding and unfolding structure for a child stroller includes a back panel 1, a seat panel 2, and a handle 3 located between the back panel 1 and the seat panel 2. The ends of the back panel 1, the seat panel 2, and the handle 3 are rotatably connected, allowing for folding or unfolding by rotation. When not in use, folding reduces the space occupied, making it convenient for storage or carrying. It also includes a handle reset component 6, one end of which is mounted on the back panel 1 and moves synchronously with the back panel 1, and a rotating fixing component 7 locked to the seat panel 2. The rotating fixing component 7, the back panel 1, the seat panel 2, the handle reset component 6, and the handle 3 are coaxially rotatably connected from the outside to the inside.

[0024] A backplate locking mechanism 8 is provided between the backplate 1 and the seat plate 2. A lever 4 is provided on the backplate 1. Manually moving the lever 4 unlocks the backplate locking mechanism 8 by pulling a rope, allowing the backplate to rotate downwards and fold. A handle locking mechanism 10 is provided between the handle reset piece 6, the handle 3, and the seat plate 2. The handle 3 is locked by the handle locking mechanism 10 to prevent it from rotating during use. The handle locking mechanism 10 is unlocked by rotating the handle reset piece 6, allowing the handle 3 to rotate and fold. A handle linkage mechanism 31 is also provided between the handle reset piece 6 and the handle 3 and the seat plate 2 located on both sides. The handle linkage mechanism 31 is used to link the movement of the handle 3 and the handle reset piece 6. When the backplate 1 is unfolded or folded, the handle 3 is simultaneously unfolded or folded by the handle linkage mechanism 31. A seat plate locking mechanism 11 is provided between the seat plate 2 and the rotating fixing piece 7. The seat plate locking mechanism 11 and the rotating fixing piece 7 form a lock to restrict the rotation of the seat plate 2. The seat plate 1 is unlocked by rotating downwards, allowing the seat plate 2 to rotate and fold. This design only requires toggling the lever 4 to release the lock of the back plate 1, allowing the back plate 1 to be rotated downwards for folding. During the downward rotation of the back plate 1, the handle reset component 6 rotates synchronously, releasing the lock of the handle 3. Furthermore, during the downward rotation of the back plate 1, the seat plate locking mechanism 11 is also unlocked. The downward rotation of the back plate 1 unlocks the handle 3 and the seat plate 2 in conjunction with the folding mechanism. No additional operation is required to unlock the handle 3 and the seat plate 2, making it convenient and easy to use, meeting the user's daily convenience needs.

[0025] The backplate locking mechanism 8 includes several annularly distributed pin slots 12 at the end of the base plate 2 and a backplate pin 13 installed inside the backplate 1. The pin slots 12 are located on the side of the base plate 2 closest to the backplate 1. The backplate pin 13 is inserted into the pin slots 12 to lock the backplate 1, preventing it from rotating. Manually moving the lever 4 pulls the pull rope, causing the backplate pin 13 to move out of the pin slots 12, releasing the lock on the backplate 1, allowing it to rotate downwards for folding. A spring inside the backplate 1 holds the backplate pin 13 in place. After the backplate is folded, the backplate pin 13, through the spring's return force, engages with the corresponding pin slot 12 to relock the backplate 1.

[0026] The handle locking mechanism 10 includes a handle latch limiting member 14 fixed inside the handle 3, a handle latch 15 movably mounted on the handle latch limiting member 14, and a shaft 16 located on the base plate 2 and passing through the handle 3. A spring is provided between the handle latch 15 and the handle latch limiting member 14, and the handle latch 15 is movably mounted laterally inside the handle latch limiting member 14. The handle latch limiting member 14 and the handle latch 15 rotate synchronously with the handle 3, and the handle 3 is locked by the engagement of the handle latch 15 with the shaft 16.

[0027] The shaft 16 is provided with a handle latch fixing groove 17, and the handle reset member 6 is provided with a boss 9. The boss 9 is annular and fits against the outer edge of the shaft 15. When the back plate is unfolded, the handle latch 15 is partially exposed at one end of the handle latch limiting member 14 and embedded in the handle latch fixing groove 17 to restrict the rotation of the handle 3. When the handle reset member 6 is folded down with the back plate 1, the boss 9 rotates synchronously. The boss 9 touches the handle latch 15 and gradually pushes the handle latch 15 into the handle latch limiting member 14, so that the handle latch 15 gradually disengages from the handle latch fixing groove 17 to unlock the handle locking mechanism 10. The shaft 16 abuts against the end of the handle latch 15 so that it cannot rebound by the spring.

[0028] The handle linkage mechanism 31 includes an upper annular groove 18 on the handle reset member 6, a lower annular groove 19 on the seat plate 2 corresponding to the upper annular groove 18, and a movable paddle 20 located in the upper annular groove 18. The movable paddle 20 drives the handle 3 to rotate and engages with the handle 3. The movable paddle 20 is made of plastic, and after being squeezed, it can be reset by the elasticity of its own material.

[0029] The movable paddle 20 is provided with a hook 21 at its end, and the handle pin limiting member 14 is provided with a locking block 22 adapted to the hook 21. When the handle reset member 6 rotates, the hook 21 drives the locking block 22 to move in a way that links the rotation, unfolding or folding of the handle 3.

[0030] When folding, the back plate 1 drives the handle reset piece 6 to rotate downwards, and the boss 9 pushes the handle latch 15 into the handle latch limit piece 14 to release the locking state of the handle 3. The latch 21 touches the top of the latch block 22 and continues to rotate downwards. The latch 21 drives the latch block 22 to move, thereby realizing the downward rotation of the handle 3 for folding. The latch 21 also abuts against the top of the latch block 22 to fix the handle 3.

[0031] When unfolded, first rotate the back plate 1 downwards. The locking block 22 presses against the locking hook 21, causing the movable lever 20 to deform and move into the lower annular groove 19. The locking hook 21 disengages from the locking block 22. Continuing to rotate downwards, the locking hook 21 moves from above the locking block 22 to below it. The movable lever 20 resets due to its own elasticity, causing the locking hook 21 to adhere to the lower part of the locking block 22. Then, rotate the back plate 1 upwards, causing the handle reset piece 6 to rotate upwards simultaneously. The movable lever 20 on the handle reset piece 6 adheres to the plane of the base plate 2, and its locking... Hook 21 drives the locking block 22 on the handle locking pin limiting part 14 to move, causing the handle 3 to start to unfold upward. After the handle locking pin 15 is locked into the handle pin fixing groove 14, the back plate 1 is rotated upward. The movable paddle 20 and hook 21 on the handle reset part 6 touch the locking block 22 and deform through the space of the lower annular groove 19. The hook 21 is disengaged from the locking block 22. The hook 21 moves from below the locking block 22 to above the locking block 22, and the handle 3 is reset. Then the back plate 1 is pulled upward, and the seat plate 2 and the back plate 1 are reset in sequence and form a locking connection.

[0032] The seat locking mechanism 11 includes a mounting groove 23 on the side of the seat plate near the back plate 1, a laterally movable rotating limiter 24 fitted within the mounting groove 23, and a spring located between the mounting groove 23 and the rotating limiter 24. The mounting groove 23 and the rotating limiter 24 are contoured to restrict the rotation of the rotating limiter 24. The rotating limiter 24 can only move laterally within the mounting groove 23 by pressing and is reset by the spring. The rotating limiter 24 passes through the back plate 1 and engages with the rotating fixing member 7 to restrict the rotation of the seat plate 2.

[0033] The rotating limiting member 24 is provided with a protruding buckle 25, which is located on both sides. The rotating fixing member 7 is provided with a slot 26 that is adapted to the buckle 25. The buckle 25 is disengaged from the slot 26 by the lateral movement of the rotating fixing member 24 to unlock. After unlocking, the seat plate 2 can rotate.

[0034] The rotating limiting member 24 has rotating limiting member bosses 27 on both sides, and the back plate 1 has back plate bosses 28 on both sides. When the back plate 1 is in the unfolded state, the rotating limiting member bosses 27 and the back plate bosses 28 are in the same longitudinal direction but do not contact each other. The back plate bosses 28 have inclined guide surfaces 29 on both sides, and the rotating limiting member bosses 27 have inclined guide surfaces 30 on both sides. When the back plate 1 rotates, the back plate bosses 28 also rotate. The guide surfaces 29 on the back plate bosses 28 gradually move along the guide surfaces 30. The back plate bosses 28 rotate to below the rotating limiting member bosses 27 and push up the rotating limiting member 24, realizing the lateral movement of the rotating limiting member 24. The rotating limiting member 24 drives the buckle 25 to disengage from the slot 26, and the locking of the seat plate 2 is released. At this time, the seat plate 2 can be rotated. Through the design of the two inclined surfaces of the guide surfaces 30 and 29, the rotating limiting member 24 can move more easily when the back plate 1 rotates, and the rotation of the back plate 1 is also smoother.

[0035] When unfolding is required, manually move the lever 4 to disengage the backplate pin 13 from the pin slot 12. Manually rotate the backplate 1 upwards, and the handle reset piece 6 rotates upwards synchronously with the backplate 1. The handle latch 15, through spring return, re-engages into the handle pin fixing slot 17 to secure the handle 3. The hook 21 disengages from the latch block 22, and the handle 3 is fully unfolded. Simultaneously with the upward rotation of the backplate 1, the backplate boss 28 pushes the rotation limit piece boss 27, causing the rotation limit piece 24 to move and release the latch 25 from the slot 26. The base plate 3 can also rotate and unfold. After unfolding, the rotation limit piece 24, through spring return, re-engages the latch 25 into the slot 26 for securing. After the backplate 1 is fully unfolded, the backplate pin 13 is also spring-engaged into the pin slot 12.

[0036] The front end of the seat plate 2 is provided with an extension plate 5 to increase the length of the seat plate 2. The extension plate 5 is rotatably connected to the seat plate 2 and can be rotatably folded.

[0037] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A folding and unfolding structure for a child stroller, comprising a back panel, a seat panel, and a handle located between the back panel and the seat panel, wherein the ends of the back panel, the seat panel, and the handle are rotatably connected, and the back panel, the seat panel, and the handle can be folded or unfolded by rotation, characterized in that, It also includes a handle reset component mounted on the back plate and moving synchronously with the back plate, and a rotating fixing component locked to the seat plate. The rotating fixing component, the back plate, the seat plate, the handle reset component, and the handle are coaxially rotatably connected from the outside to the inside. A back plate locking mechanism is provided between the back plate and the seat plate. A lever is provided on the back plate. The lever can be moved to unlock the back plate locking mechanism by pulling a rope, which is used for the rotation and folding of the back plate. A handle locking mechanism is provided between the handle reset component and the handles and seat plates located on both sides. The handle is locked by the handle locking mechanism. The handle reset component is rotated to unlock the locked state of the handle locking mechanism for the rotation and folding of the handle. A handle linkage mechanism is also provided between the handle reset component and the handles and seat plate located on both sides. The handle linkage mechanism is used to link the movement of the handle and the handle reset component. When the seat plate is unfolded or folded, the handle is driven to unfold or fold synchronously through the handle linkage mechanism. A seat plate locking mechanism is provided between the seat plate and the rotating fixing member. The seat plate locking mechanism and the rotating fixing member form a lock to restrict the rotation of the seat plate. When the back plate rotates downward, it is linked to the seat plate locking mechanism to unlock for the rotation and folding of the seat plate.

2. The folding and unfolding structure of a children's stroller according to claim 1, characterized in that, The handle locking mechanism includes a handle latching pin fixed inside the handle, a handle latching pin movably mounted on the handle latching pin, and a shaft located on the base plate and passing through the handle. The handle latching pin and the handle latching pin rotate synchronously with the handle, and the handle is locked by the engagement of the handle latching pin and the shaft.

3. The folding and unfolding structure of a children's stroller according to claim 2, characterized in that, The shaft column is provided with a handle latch fixing groove, and the handle reset component is provided with a boss. The boss is annular and fits against the outer edge of the shaft column. When the back plate is unfolded, the handle latch is fixed in the handle latch fixing groove to limit the rotation of the handle. When the handle reset component is folded down with the back plate, the boss gradually pushes the handle latch into the handle latch limiting component, and the handle latch disengages from the handle latch fixing groove to release the locked state of the handle. The handle latch is reset by the rebound force of the spring.

4. The folding and unfolding structure of a children's stroller according to claim 2, characterized in that, The handle linkage mechanism includes an upper annular groove on the handle reset component, a lower annular groove on the base plate corresponding to the upper annular groove, and a movable paddle located in the upper annular groove. The movable paddle drives the handle to rotate and engages with the handle.

5. The folding and unfolding structure of a children's stroller according to claim 4, characterized in that, The movable paddle is provided with a hook at its end, and the handle locking pin is provided with a locking block adapted to the hook. When folding, the back panel drives the handle reset component to rotate downwards, releasing the handle from its locked state. The hook touches the top of the locking block, and the hook continues to rotate downwards, causing the locking block to move to link the folding of the handle. The handle is fixed by the cooperation of the hook and the locking block. When unfolding, first rotate the back plate downwards. The locking block presses against the locking hook, causing the movable lever to move to the lower annular groove. The locking hook disengages from the locking block. Continue rotating downwards to move the locking hook below the locking block. The movable lever resets itself through its own elastic force, causing the locking hook to adhere to the lower part of the locking block. Then rotate the back plate upwards. Its locking hook moves the locking block upwards, linking the unfolding of the handle. After the handle locking pin engages with the handle pin fixing groove, rotate the back plate upwards. The movable lever on the handle reset part deforms through the space of the lower annular groove, causing the locking hook to disengage from the locking block. Continue to pull the back plate upwards. The base plate and back plate reset in sequence and form a locking connection.

6. The folding and unfolding structure of a children's stroller according to claim 1, characterized in that, The backplate locking mechanism includes several annularly distributed pin slots at the end of the base plate and a backplate pin installed inside the backplate. The pin slots are located on the side of the base plate close to the backplate. The backplate pin is inserted into the pin slot to lock the backplate. The lever drives the backplate pin to move away from the pin slot through the pull rope to unlock the backplate. After the backplate pin moves, it is re-engaged into the pin slot by the spring's rebound force.

7. The folding and unfolding structure of a children's stroller according to claim 1, characterized in that, The seat plate locking mechanism includes a mounting groove on the side of the seat plate near the back plate, a laterally movable rotating limiter assembled in the mounting groove, and a spring located between the mounting groove and the rotating limiter. The mounting groove and the contour of the rotating limiter are adapted to restrict the rotation of the rotating limiter. The rotating limiter passes through the back plate and forms a snap-fit ​​with the rotating fixing member to restrict the rotation of the seat plate.

8. The folding and unfolding structure of a children's stroller according to claim 7, characterized in that, The rotating limiting component has a protruding buckle, and the rotating fixing component has a slot that fits the buckle. The buckle is disengaged from the slot by the lateral movement of the rotating fixing component, thus unlocking the device.

9. The folding and unfolding structure of a children's stroller according to claim 8, characterized in that, The rotating limiting component has rotating limiting component bosses on both sides, and the back plate has back plate bosses on both sides. The back plate bosses have inclined guide surfaces on both sides, and the rotating limiting component bosses have inclined guide surfaces on both sides. When the back plate rotates, the back plate bosses also rotate. The guide surfaces on the back plate bosses gradually move along the guide surfaces. The back plate bosses rotate to below the rotating limiting component bosses and push up the rotating limiting component, realizing the lateral movement of the rotating limiting component. The rotating limiting component drives the buckle to disengage from the slot, and the locking of the base plate is released.

10. The folding and unfolding structure of a children's stroller according to claim 1, characterized in that, An extension plate is provided at the front end of the seat plate, and the extension plate is rotatably connected to the seat plate.

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