A quick-adjusting self-locking rotation limit structure for the support legs of a child safety seat

Abstract

The present invention discloses a quick-adjustment self-locking rotation limit structure for a child safety seat support leg, which relates to the field of child seat support legs, and includes a support rod and a quick-adjustment assembly, wherein the top of the support rod is rotatably connected to a support frame, and the support frame is used to connect to a safety seat, and the bottom of the support rod is movably connected to a support block, and the quick-adjustment assembly is fixedly installed inside the support block. The present invention can change the height of the top support rod by slightly rotating the first rotating rod and the second rotating rod, and can generate greater output power compared to the traditional rotary switch structure, and the first rotating rod and the second rotating rod are staggered, which can ensure that the top support rod is always in an ascending state during actual use, thereby saving the time spent on raising the height of the support rod.

Description

Technical Field

[0001] The invention relates to the technical field of child seat support legs, in particular to a quick-adjusting self-locking rotation limiting structure for a child safety seat support leg. Background Art

[0002] A child seat, also known as a child restraint system, is a seat designed for children of different ages (or weights) and installed in a car to effectively improve the safety of children riding in a car. A child seat with a supporting leg structure is more stable and safer and can effectively protect children.

[0003] For example, the "A rotation limiting structure for a child seat support leg and its working method" with publication number: CN114435204A includes a support leg main body, a connecting piece is provided on one side of the upper end of the support leg main body, and a slide rail is provided on one side of the connecting piece, two connecting plates are provided at one end of the slide rail, the slide rail is rotatably connected to the connecting piece through the connecting plate, a slide groove is provided on one side of the connecting plate, and a limiting slot is provided on the other side of the connecting plate.

[0004] However, in the prior art, although the support leg structure of the child seat is equipped with a rotation limit structure, most of them do not have a quick-adjustment self-locking function. Therefore, in the actual adjustment process, it is often necessary to spend a lot of time on raising the height of the support leg, and subsequently during the driving of the vehicle, the bumps of the vehicle body are also likely to affect the structural stability of the support leg, causing the support leg to become unstable during use, affecting the safety of the child seat. Summary of the invention

[0005] The purpose of the present invention is to provide a quick-adjust self-locking rotation limit structure for a child safety seat support leg to solve the problem proposed in the above-mentioned background technology that a lot of time is spent on raising the height of the support leg, and the subsequent bumps of the vehicle body during driving are also likely to affect the structural stability of the support leg.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a quick-adjustment self-locking rotation limit structure for a child safety seat support leg, comprising a support rod and a quick-adjustment assembly, wherein the top of the support rod is rotatably connected to a support frame, the support frame is used to be connected to the safety seat, the bottom of the support rod is movably connected to a support block, and the quick-adjustment assembly is fixedly installed inside the support block;

[0007] The quick-adjustment assembly includes a support rod, a base, a damper, a first rotating rod and a second rotating rod, a handle is fixedly installed on one side of the first rotating rod and one side of the second rotating rod, one end of the first rotating rod and one end of the second rotating rod are fixedly connected to a positioning frame, a first ratchet is rotatably installed inside one of the positioning frames, and a second ratchet is rotatably installed inside the other positioning frame, a transmission rod is fixedly connected between the first ratchet and the second ratchet, a driving gear is fixedly installed on the middle section of the transmission rod, and one side of the driving gear is meshingly connected with a connecting rotating rod, the base is fixedly installed on the bottom of the support rod, the damper is fixedly installed on the bottom of the base, one side of the support rod is meshingly connected with the connecting rotating rod, and the first rotating rod and the second rotating rod are arranged in an upper and lower staggered manner.

[0008] Preferably, one side of the two positioning frames is rotatably connected to a limit plate, the limit plate is slidably connected to the support block, one side of the limit plate is fixedly mounted with an extension side rod, and the extension side rod is slidably connected to the inside of the support block.

[0009] Preferably, a positioning hole is provided at the junction of the support block and the extended side rod, a fixing block is clamped inside the positioning hole, and one end of the fixing block is clamped on one side of the extended side rod.

[0010] Preferably, the top of the supporting rod is fixedly connected with a rotating rod, the rotating rod is rotatably connected to the inside of the supporting rod, the bottom of the supporting rod is overlapped on the top of the supporting block, and the rotating rod passes through the top of the supporting block.

[0011] Preferably, one side of the two positioning frames is fixedly connected with a containing pipe, the transmission rod is built inside the containing pipe, and the driving gear is located between the two containing pipes.

[0012] Preferably, a mounting connection plate is fixedly mounted on the inner wall of the support block, a center rod is slidably connected to one side of the mounting connection plate, and a rotating block is rotatably connected to the outer wall of the center rod.

[0013] Preferably, both ends of the rotating block are rotatably connected to bending rods, the other ends of the two bending rods are respectively slidably connected to the inside of the two positioning frames, the inside of the bending rods is fixedly connected to a blocking rod by a spring, and a circular hole with a shape matching the blocking rod is opened on the mounting connecting plate, and the blocking rod is located between the mounting connecting plate and the rotating block.

[0014] Preferably, a connection block is rotatably installed inside the positioning frame, the shape of one end of the connection block is matched with the shape of the tooth groove of the first ratchet wheel, and the connection block is located at one side of the first ratchet wheel.

[0015] Preferably, a limit plate is fixedly installed on the upper surface of the positioning frame, the limit plate is located on one side of the connecting block, one end of the connecting block is fixedly connected to an extension rod, and the length of the extension rod is greater than the thickness of the positioning frame.

[0016] Preferably, a rotating round block is rotatably mounted on the lower surface of the positioning frame, an eccentric rod is mounted inside the rotating round block, and the eccentric rod is rotatably connected to the positioning frame, and a docking groove is fixedly mounted at the eccentric portion of the rotating round block.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In the present invention, the support frame is connected to the safety seat, and one end is rotatably connected to the support rod. The height of the support rod is controlled by a quick-adjustment component. When in use, the height of the top support rod can be changed by slightly rotating the first rotating rod and the second rotating rod. Compared with the traditional rotary switch structure, a larger output power can be generated, and the first rotating rod and the second rotating rod are staggered. In actual use, it can be ensured that the top support rod is always in an ascending state, thereby saving the time spent on raising the height of the support rod. When releasing the support rod later, it is only necessary to pull out the first rotating rod to release the top support rod, so that the top support rod can be dropped to the lowest height, which reduces the difficulty of installation and disassembly, and the overall structure has a quick adjustment function, which is convenient for use on the vehicle.

[0019] 2. In the present invention, after adjusting the height of the support rod, the rotating round block is rotated to support the extended support rod to complete the fixation of the connecting block. At this time, the first rotating rod and the second rotating rod are rotated significantly to rotate the blocking rod to the round hole, and the blocking rod is allowed to bounce into the round hole to achieve the locking of the rotating block. At this time, the rotating block cannot rotate, and the locking of the first rotating rod and the second rotating rod will be completed synchronously, and it can ensure that the first rotating rod and the second rotating rod will not have the problem of self-rotation, and the locking of their own status is achieved, so as to avoid the bumps of the vehicle body and affect the structural stability of the support rod, and ensure that the support rod will not shake and be unstable.

[0020] 3. In the present invention, the limiting plate can determine the position of the connecting block. When the connecting block is supported by the rotating round block, it can prevent the connecting block from rotating too much and moving away from the first ratchet. The overall length of the connecting block is lengthened by the extending support rod, thereby ensuring that the connecting block can dock with the first ratchet while being limited by the rotating round block. The existence of the docking groove can ensure the connection stability between the rotating round block and the extending support rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a quick-adjusting self-locking rotation limiting structure of a child safety seat support leg of the present invention;

[0022] Figure 2 A side view of a support rod and a quick-adjustment assembly of a quick-adjustment self-locking rotation limiting structure for a support leg of a child safety seat according to the present invention;

[0023] Figure 3 It is a three-dimensional structural schematic diagram of a quick-adjusting assembly of a quick-adjusting self-locking rotation limiting structure of a child safety seat support leg according to the present invention;

[0024] Figure 4 A top view of a quick-adjusting component of a quick-adjusting self-locking rotation limiting structure for a support leg of a child safety seat according to the present invention;

[0025] Figure 5 It is a front view of a quick-adjusting component of a quick-adjusting self-locking rotation limiting structure of a child safety seat support leg of the present invention;

[0026] Figure 6 It is a three-dimensional structural schematic diagram of a first ratchet and a second ratchet of a quick-adjusting self-locking rotation limiting structure of a child safety seat support leg of the present invention;

[0027] Figure 7 It is a side view of a first ratchet and a second ratchet of a quick-adjusting self-locking rotation limiting structure of a support leg of a child safety seat according to the present invention;

[0028] Figure 8 The present invention is a schematic diagram of the three-dimensional structure of a positioning frame of a child safety seat support leg quick-adjustment self-locking rotation limit structure.

[0029] In the figure: 1. support frame; 2. support rod; 3. support block; 4. quick adjustment component; 5. installation connecting plate; 6. positioning hole; 7. fixing block; 41. top support rod; 42. base; 43. damper; 44. first rotating rod; 45. second rotating rod; 46. rotating rod; 47. positioning frame; 48. limit plate; 49. extended side rod; 410. connecting rotating rod; 411. handle; 412. accommodating pipe; 413. driving gear; 414. center rod; 415. rotating block; 416. bending rod; 417. transmission rod; 418. first ratchet; 419. second ratchet; 420. blocking rod; 421. limit plate; 422. connecting block; 423. extending support rod; 424. rotating round block; 425. docking groove. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1: Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown: a quick-adjustment self-locking rotation limit structure of a child safety seat support leg, comprising a support rod 2 and a quick-adjustment assembly 4, wherein the top of the support rod 2 is rotatably connected to a support frame 1, the support frame 1 is used to be connected to the safety seat, the bottom of the support rod 2 is movably connected to a support block 3, the quick-adjustment assembly 4 is fixedly installed inside the support block 3, the quick-adjustment assembly 4 comprises a top support rod 41, a base 42, a damper 43, a first rotating rod 44 and a second rotating rod 45, one side of the first rotating rod 44 and one side of the second rotating rod 45 are both fixedly installed with a handle 411, one end of the first rotating rod 44 and one end of the second rotating rod 45 are both fixedly connected with a positioning frame 47, one of the positioning frames 47 is internally rotatably installed with a first ratchet 418, and the other positioning frame 47 is internally rotatably installed with a second ratchet 419, A transmission rod 417 is fixedly connected in the middle, a driving gear 413 is fixedly installed in the middle section of the transmission rod 417, one side of the driving gear 413 is meshedly connected with a connecting rotating rod 410, the base 42 is fixedly installed at the bottom of the supporting top rod 41, the damper 43 is fixedly installed at the bottom of the base 42, one side of the supporting top rod 41 is meshedly connected with the connecting rotating rod 410, the first rotating rod 44 and the second rotating rod 45 are arranged in an up and down staggered manner, the top of the supporting top rod 41 is fixedly connected with a rotating rod 46, the rotating rod 46 is rotatably connected to the inside of the support rod 2, the bottom of the support rod 2 is overlapped on the top of the support block 3, the rotating rod 46 passes through the top of the support block 3, one side of the two positioning frames 47 is fixedly connected with a containing pipe 412, the transmission rod 417 is built into the inside of the containing pipe 412, and the driving gear 413 is located between the two containing pipes 412.

[0032] In this embodiment, the support frame 1 is connected to the safety seat. When deploying the child safety seat, the support frame 1 is fixed to the vehicle seat, and then the height of the support rod 2 is adjusted by the quick adjustment component 4. When using the quick adjustment component 4, both hands hold the handles 411 on the first rotating rod 44 and the second rotating rod 45 respectively, and the height of the supporting rod 41 is raised by slightly rotating the first rotating rod 44 and the second rotating rod 45 up and down to achieve the purpose of adjusting the height of the support rod 2. The supporting rod 41 is rotatably connected to the support rod 2 through the rotating rod 46, so that the direction of the quick adjustment component 4 can be adjusted at will;

[0033] The first rotating rod 44 and the second rotating rod 45 will drive the first ratchet 418 and the second ratchet 419 installed in the positioning frame 47 to rotate, and because the first rotating rod 44 and the second rotating rod 45 are staggered, when the first rotating rod 44 rotates upward, it will drive the first ratchet 418 to rotate, and when the second rotating rod 45 rotates upward, it will drive the second ratchet 419 to rotate, thereby ensuring that during the entire rotation process of the first rotating rod 44 and the second rotating rod 45, the first ratchet 418 and the second ratchet 419 are connected by the transmission rod 417, and the driving gear 413 is installed on the transmission rod 417. Whether the first ratchet 418 or the second ratchet 419 rotates, it will synchronously drive the driving gear 413, and the driving gear 413 is used to drive the connecting rotating rod 410 to ensure that the supporting rod 41 is always in an ascending state, thereby saving the time spent on raising the height of the supporting rod 2. The transmission rod 417 is located in the accommodating pipe 412, which can ensure the stability of itself and the first ratchet 418 and the second ratchet 419.

[0034] The bottom of the supporting rod 41 is connected to a damper 43 through a base 42 to prevent a strong collision between the supporting rod 41 and the supporting block 3, thereby ensuring the safety of the safety seat.

[0035] Embodiment 2: According to Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, a handle 411 is fixedly installed on one side of the first rotating rod 44 and one side of the second rotating rod 45, and a positioning frame 47 is fixedly connected to one end of the first rotating rod 44 and one end of the second rotating rod 45. One side of the two positioning frames 47 is rotatably connected to a limiting plate 48, and the limiting plate 48 is slidably connected to the support block 3. An extended side rod 49 is fixedly installed on one side of the limiting plate 48, and the extended side rod 49 is slidably connected to the inside of the support block 3. A positioning hole 6 is provided at the junction of the support block 3 and the extended side rod 49. A fixed block 7 is clamped inside the positioning hole 6, and one end of the fixed block 7 is clamped to one side of the extended side rod 49.

[0036] In this embodiment, the extended side rod 49 on the side of the limit plate 48 is set in the positioning hole 6 of the support block 3 to determine the position of the partial structure of the quick adjustment component 4. Figure 1 For example, when using the quick-adjustment assembly 4 to change the height of the support rod 2, ensure that the extended side rod 49 is located at the left end of the positioning hole 6. At this time, the arc-shaped opening of the fixing block 7 is facing left. When the support rod 2 needs to be reset, remove the fixing block 7 and adjust its arc-shaped opening direction to the right. At this time, move the extended side rod 49 to the right end of the positioning hole 6, and then reinstall the fixing block 7 into the positioning hole 6 to fix the extended side rod 49.

[0037] Embodiment 3: According to Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, a mounting connecting plate 5 is fixedly installed on the inner wall of the support block 3, a center rod 414 is slidably connected to one side of the mounting connecting plate 5, a rotating block 415 is rotatably connected to the outer wall of the center rod 414, both ends of the rotating block 415 are rotatably connected to bending rods 416, the other ends of the two bending rods 416 are respectively slidably connected to the inside of the two positioning frames 47, a blocking rod 420 is fixedly connected to the inside of the bending rod 416 by a spring, a circular hole with a shape matching the blocking rod 420 is opened on the mounting connecting plate 5, and the blocking rod 420 is located between the mounting connecting plate 5 and the rotating block 415.

[0038] In this embodiment, the installation connecting plate 5 determines the position of the rotating block 415, and the center rod 414 at the center of the rotating block 415 is inserted into the installation connecting plate 5, which will not affect the movement of the extended side rod 49. At the same time, the rotating block 415 itself is rotatably connected with the center rod 414, and the center rod 414 will not affect the rotation of the rotating block 415.

[0039] The bending rods 416 at both ends of the rotating block 415 are slidably connected in the positioning frame 47. During the rotation of the positioning frame 47, one end of the bending rod 416 rotates in the rotating block 415, and the other end slides in the positioning frame 47, so that the rotation of the positioning frame 47 can drive the rotating block 415. The function of the rotating block 415 is to lock the quick adjustment component 4 and prevent the first rotating rod 44 and the second rotating rod 45 from rotating.

[0040] After adjusting the height of the support rod 2, the first rotating rod 44 and the second rotating rod 45 are rotated significantly to rotate the blocking rod 420 on the rotating block 415 to the circular hole on the mounting connecting plate 5, and the blocking rod 420 is bounced into the circular hole by a spring to lock the rotating block 415. At this time, the rotating block 415 cannot rotate, and the bending rod 416 can complete the locking of the first rotating rod 44 and the second rotating rod 45, thereby locking its own state and preventing the vehicle body from shaking and affecting the structural stability of the support rod 2.

[0041] Embodiment 4: According to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, a handle 411 is fixedly installed on one side of the first rotating rod 44 and one side of the second rotating rod 45, and a positioning frame 47 is fixedly connected to one end of the first rotating rod 44 and one end of the second rotating rod 45, wherein a first ratchet 418 is rotatably installed inside one of the positioning frames 47, and a second ratchet 419 is rotatably installed inside the other positioning frame 47, a transmission rod 417 is fixedly connected between the first ratchet 418 and the second ratchet 419, a driving gear 413 is fixedly installed on the middle section of the transmission rod 417, and one side of the driving gear 413 is meshedly connected with a connecting rotating rod 410, a base 42 is fixedly installed on the bottom of the supporting rod 41, and a damper 43 is fixedly installed on the bottom of the base 42, and one side of the supporting rod 41 is meshedly connected with the connecting rotating rod 410, and the first The rotating rod 44 and the second rotating rod 45 are arranged in an upper and lower staggered manner, and a connecting block 422 is rotatably installed inside the positioning frame 47. The shape of one end of the connecting block 422 is adapted to the shape of the tooth groove of the first ratchet 418, and the connecting block 422 is located on one side of the first ratchet 418. A limiting plate 421 is fixedly installed on the upper surface of the positioning frame 47, and the limiting plate 421 is located on one side of the connecting block 422. An extension support rod 423 is fixedly connected to one end of the connecting block 422, and the length of the extension support rod 423 is greater than the thickness of the positioning frame 47. A rotating round block 424 is rotatably installed on the lower surface of the positioning frame 47, and an eccentric rod is installed inside the rotating round block 424, and the eccentric rod is rotatably connected to the positioning frame 47, and a docking groove 425 is fixedly installed at the eccentric part of the rotating round block 424.

[0042] In this embodiment, the first rotating rod 44 and the second rotating rod 45 have the same structure, and both sides are provided with a handle 411 for the user to grasp. Figure 2 and Figure 7 For example, when the user rotates the first rotating rod 44 and the second rotating rod 45, when the first rotating rod 44 and the second rotating rod 45 rotate upward, under the action of gravity, one end of the connecting block 422 will be embedded in the tooth grooves on the first ratchet 418 and the second ratchet 419. At this time, the rotation of the first rotating rod 44 and the second rotating rod 45 will drive the first ratchet 418 and the second ratchet 419 to rotate counterclockwise, and the driving gear 413 will drive the connecting rotating rod 410 to rotate clockwise, so as to achieve the purpose of lifting the height of the supporting rod 41;

[0043] When the first rotating rod 44 and the second rotating rod 45 rotate downward, the resistance of the first ratchet 418 and the second ratchet 419 to the connecting block 422 will force it to rotate upward until the connecting block 422 contacts the limiting piece 421. At this time, the first rotating rod 44 and the second rotating rod 45 will not drive the first ratchet 418 and the second ratchet 419 when rotating downward. Moreover, because the first rotating rod 44 and the second rotating rod 45 are arranged in an alternating manner, it can be ensured that one rotating rod rotates upward each time.

[0044] Before inserting the blocking rod 420 into the mounting connecting plate 5, the rotating ball 424 is first rotated to connect the docking groove 425 with the extending support rod 423, and the rotating ball 424 is used to fix the connecting block 422 to ensure that the connecting block 422 does not contact the first ratchet 418 or the second ratchet 419.

[0045] The use method and working principle of the device: the support frame 1 is connected to the safety seat. When deploying the child safety seat, the support frame 1 is fixed to the vehicle seat, and the height of the support rod 2 is adjusted by the quick adjustment component 4 after ensuring that the extended side rod 49 is located at the left end of the positioning hole 6.

[0046] Hold the handles 411 on the first rotating rod 44 and the second rotating rod 45 with both hands respectively, and rotate the first rotating rod 44 and the second rotating rod 45 up and down slightly. When the first rotating rod 44 and the second rotating rod 45 rotate upward, one end of the connecting block 422 will fall into the tooth grooves on the first ratchet 418 and the second ratchet 419. At this time, the rotation of the first rotating rod 44 and the second rotating rod 45 will drive the first ratchet 418 and the second ratchet 419 to rotate counterclockwise, and the driving gear 413 drives the connecting rotating rod 410 to rotate clockwise, so as to lift the height of the supporting rod 41, thereby achieving the purpose of adjusting the height of the supporting rod 2;

[0047] After determining the position of the support rod 2, rotate the rotating round block 424 to make the docking groove 425 dock with the extension support rod 423. After supporting the extension support rod 423, significantly rotate the first rotating rod 44 and the second rotating rod 45 to rotate the blocking rod 420 to the circular hole on the installation connecting plate 5, so that the blocking rod 420 is ejected into the circular hole, thereby locking the rotating block 415, and thus completing the locking of the first rotating rod 44 and the second rotating rod 45.

[0048] When it is necessary to restore the height of the support rod 2, pull out the fixing block 7 and adjust the arc-shaped opening direction of the fixing block 7 to the right. At this time, move the extended side rod 49 to the right end of the positioning hole 6, so that the connecting rotating rod 410 can be separated from the supporting top rod 41. At this time, the blocking rod 420 on the rotating block 415 will also be moved out from the mounting connecting plate 5, and then the supporting top rod 41 will fall to the lowest height. The damper 43 can prevent a strong collision between the supporting top rod 41 and the support block 3. Then, reinstall the fixing block 7 into the positioning hole 6 to fix the extended side rod 49. When the quick adjustment assembly 4 needs to be used again, the docking groove 425 on the rotating circle 424 can be turned away from the extended support rod 423.

[0049] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A quick-adjustment self-locking rotation limit structure for a child safety seat support leg, characterized in that: It comprises a support rod (2) and a quick-adjustment assembly (4), wherein the top of the support rod (2) is rotatably connected to a support frame (1), the support frame (1) is used to be connected to a safety seat, the bottom of the support rod (2) is movably connected to a support block (3), and the quick-adjustment assembly (4) is fixedly mounted inside the support block (3); The quick-adjusting assembly (4) comprises a supporting rod (41), a base (42), a damper (43), a first rotating rod (44) and a second rotating rod (45); a handle (411) is fixedly mounted on one side of the first rotating rod (44) and one side of the second rotating rod (45); one end of the first rotating rod (44) and one end of the second rotating rod (45) are fixedly connected to a positioning frame (47); a first ratchet (418) is rotatably mounted inside one of the positioning frames (47); a second ratchet (419) is rotatably mounted inside the other positioning frame (47); A transmission rod (417) is fixedly connected between the first ratchet (418) and the second ratchet (419); a driving gear (413) is fixedly mounted on the middle section of the transmission rod (417); one side of the driving gear (413) is meshingly connected to a connecting rotating rod (410); the base (42) is fixedly mounted on the bottom of the supporting rod (41); the damper (43) is fixedly mounted on the bottom of the base (42); one side of the supporting rod (41) is meshingly connected to the connecting rotating rod (410); and the first rotating rod (44) and the second rotating rod (45) are arranged in an upper and lower staggered manner.

2. The quick-adjusting self-locking rotation limit structure for a child safety seat support leg according to claim 1, characterized in that: One side of the two positioning frames (47) is rotatably connected to a limit plate (48), the limit plate (48) is slidably connected to the support block (3), one side of the limit plate (48) is fixedly mounted with an extension side rod (49), and the extension side rod (49) is slidably connected to the inside of the support block (3).

3. The quick-adjusting self-locking rotation limit structure for a child safety seat support leg according to claim 1, characterized in that: A positioning hole (6) is provided at the junction of the support block (3) and the extended side rod (49), a fixing block (7) is clamped inside the positioning hole (6), and one end of the fixing block (7) is clamped on one side of the extended side rod (49).

4. The quick-adjusting self-locking rotation limit structure for a child safety seat support leg according to claim 2, characterized in that: The top of the supporting rod (41) is fixedly connected to a rotating rod (46), the rotating rod (46) is rotatably connected to the inside of the supporting rod (2), the bottom of the supporting rod (2) is overlapped on the top of the supporting block (3), and the rotating rod (46) passes through the top of the supporting block (3).

5. The quick-adjusting self-locking rotation limit structure for a child safety seat support leg according to claim 4, characterized in that: One side of the two positioning frames (47) is fixedly connected to a containing pipe (412), the transmission rod (417) is built inside the containing pipe (412), and the driving gear (413) is located between the two containing pipes (412).

6. The quick-adjusting self-locking rotation limit structure for a child safety seat support leg according to claim 1, characterized in that: A mounting connection plate (5) is fixedly mounted on the inner wall of the support block (3); a center rod (414) is slidably connected to one side of the mounting connection plate (5); and a rotating block (415) is rotatably connected to the outer wall of the center rod (414).

7. The quick-adjusting self-locking rotation limit structure for a child safety seat support leg according to claim 6, characterized in that: Both ends of the rotating block (415) are rotatably connected to bending rods (416), the other ends of the two bending rods (416) are respectively slidably connected to the inside of two positioning frames (47), the inside of the bending rods (416) is fixedly connected to a blocking rod (420) via a spring, and a circular hole with a shape matching the blocking rod (420) is opened on the mounting connection plate (5), and the blocking rod (420) is located between the mounting connection plate (5) and the rotating block (415).

8. The quick-adjusting self-locking rotation limit structure for a child safety seat support leg according to claim 3, characterized in that: A connection block (422) is rotatably mounted inside the positioning frame (47), the shape of one end of the connection block (422) being compatible with the shape of the tooth groove of the first ratchet (418), and the connection block (422) is located on one side of the first ratchet (418).

9. The quick-adjusting self-locking rotation limiting structure for a child safety seat support leg according to claim 8, characterized in that: A limit plate (421) is fixedly mounted on the upper surface of the positioning frame (47), the limit plate (421) being located on one side of the connecting block (422), one end of the connecting block (422) being fixedly connected to an extension rod (423), the length of the extension rod (423) being greater than the thickness of the positioning frame (47).

10. The quick-adjusting self-locking rotation limiting structure for a child safety seat support leg according to claim 8, characterized in that: A rotating round block (424) is rotatably mounted on the lower surface of the positioning frame (47), an eccentric rod is mounted inside the rotating round block (424), and the eccentric rod is rotatably connected to the positioning frame (47), and a docking groove (425) is fixedly mounted at the eccentric portion of the rotating round block (424).

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