An adjustable child dining chair

Abstract

The adjustable children's dining chair is used to solve the technical problem that the existing children's dining chair mentioned in the background art has obvious deficiencies in operation convenience and adjustability, and cannot well meet the needs of parents and children in the actual dining process. It comprises an oval seat plate, a fixed ring fixedly connected above the edge of the seat plate, a vertical main shaft rotatably arranged in the fixed ring, a first guard rod and a second guard rod respectively slidably installed at the two ends of the fixed ring, and the first guard rod and the second guard rod are connected with the main shaft through a first connecting assembly; the bottom of the seat plate is slidably connected with a pedal in the seat depth direction of the seat plate, and the pedal is connected with the main shaft through a second connecting assembly; the bottom of the seat plate is connected with a lifting rod, and the lifting rod is connected with the main shaft through a third connecting assembly.

Description

Technical Field

[0001] This invention relates to the field of furniture technology, and more particularly to an adjustable children's dining chair. Background Technology

[0002] With the improvement of people's living standards, high chairs have become essential items for infants and toddlers, mainly designed to provide a safe and comfortable environment for them to eat. Various types of high chairs exist on the market; however, these existing high chairs have revealed many problems in actual use.

[0003] Many high chairs require an adult to perform a series of cumbersome steps after placing the child in the chair. For example, installing the safety bar in stages is not only time-consuming but can also leave the child unsafe in an emergency. Additionally, some high chairs have fixed footrests that cannot be adjusted to accommodate different needs. When not in use, these fixed footrests take up extra space, making storage or moving the chair indoors extremely inconvenient. Furthermore, some high chairs are not height-adjustable, requiring the adult to hold the child and lift them to a suitable height, which is a significant strain on the adult's arm strength, especially for parents with less physical strength. Even height-adjustable high chairs often have complex adjustment mechanisms that are difficult to operate, requiring parents to spend considerable time adjusting them, thus impacting the dining experience. In conclusion, existing children's high chairs have significant shortcomings in terms of ease of operation and adjustability, failing to adequately meet the needs of parents and children during actual mealtimes. Therefore, there is an urgent practical need to develop a children's high chair that is easy to operate and has flexible adjustment functions. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an adjustable children's dining chair, which solves the technical problem mentioned in the background art that existing children's dining chairs are significantly lacking in terms of ease of operation and adjustability, and cannot adequately meet the needs of parents and children during actual mealtimes.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: An adjustable children's high chair, comprising an elliptical seat plate, and further comprising a fixing ring, the fixing ring is fixedly connected above the edge of the seat plate, a vertical main shaft is rotatably arranged in the fixing ring, a first guard bar and a second guard bar are respectively slidably mounted in two ends of the fixing ring, the first guard bar and the second guard bar are connected with the main shaft through a first connecting assembly, and the rotation of the main shaft is used for driving the first guard bar to be inserted into the second guard bar and cooperate with the fixing ring to form a closed-loop structure; a pedal is slidably connected to the bottom of the seat plate along the sitting depth direction of the seat plate, the pedal is connected with the main shaft through a second connecting assembly, and the rotation of the main shaft is further used for driving the pedal to extend out of the edge of the seat plate; a lifting rod is connected to the bottom of the seat plate, the lifting rod is connected with the main shaft through a third connecting assembly, and the rotation of the main shaft is further used for driving the lifting rod to extend to raise the height of the seat plate.

[0006] Working principle: In use, place the child on the seat plate, then the accompanying adult rotates the main shaft, and the rotation of the main shaft simultaneously drives three structures to operate synchronously, specifically: driving the first guard bar to be inserted into the second guard bar and cooperate with the fixing ring to form a closed-loop structure; driving the pedal to extend out of the edge of the seat plate; driving the lifting rod to extend to raise the height of the seat plate.

[0007] Beneficial effects: According to the present invention, by arranging the main shaft and utilizing the first connecting assembly, the second connecting assembly and the third connecting assembly, the functions of closing the guard bars, extending the pedal and adjusting the height of the seat plate are integrated into the rotating operation of the main shaft, so that the linkage control of multiple functions is realized. The accompanying adult only needs to perform one action of rotating the main shaft to synchronously complete the three key operations of forming a closed loop with the guard bars, extending the pedal and raising the height of the seat plate, without the need for step-by-step tedious installation and adjustment, which greatly simplifies the operation flow, significantly reduces the operation difficulty, saves a lot of time and effort, and is especially suitable for parents with weak physical strength.

[0008] When the main shaft rotates, the first guard bar can be quickly inserted into the second guard bar and cooperate with the fixing ring to form a closed-loop structure, which can quickly form effective protection for the child on the seat plate, avoid potential safety hazards caused by untimely installation of the guard bars, and provide reliable safety guarantee for the child.

[0009] The pedal can be driven by the main shaft to extend out of the edge of the seat plate, and when the main shaft rotates reversely, the main shaft drives the pedal to move to the lower part of the seat plate to store the pedal, which saves the use space of the high chair.

[0010] Meanwhile, the height of the seat plate can be adjusted by the extension of the lifting rod, so that the accompanying adult does not need to lift the child, and the height can be flexibly adjusted to a proper height according to the dining scene and the height of the child, so as to improve the comfort of the child during dining. Brief Description of the Drawings

[0011] Figure 1 is a schematic structural view of an embodiment of the present invention; Figure 2 for Figure 1 Mid-top view of the structure; Figure 3 for Figure 1 A cross-sectional structural diagram of the connecting column and the support components.

[0012] In the above-mentioned attached figures: seat plate 1, fixing ring 2, main shaft 3, first guard rod 401, second guard rod 402, pedal 5, lifting rod 6, lifting block 601, auxiliary cylinder 602, secondary shaft 7, main gear 8, traction wire 9, first bevel gear 10, second bevel gear 11, connecting column 12, first rotating shaft 13, horizontal moving block 14, first limiting groove 15, mounting block 16, electric telescopic rod 17, second limiting groove 18, limiting block 19, support column 20, sleeve 21, base 22, second rotating shaft 23, first sprocket 24, second sprocket 25, chain 26, third rotating shaft 27, vertical moving block 28, sliding groove 29, plug-in block 30, plug-in hole 31, first magnetic block 32, second magnetic block 33, telescopic rod 34, winding roller 35, secondary gear 36, connecting rod 37. Detailed Implementation

[0013] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Example: like Figure 2 and Figure 3 As shown, an adjustable children's dining chair includes an oval seat 1 made of polypropylene with added antibacterial agents to reduce overall weight, facilitate movement, and meet food contact safety standards, avoiding health risks from children chewing on it. It also includes a fixing ring 2 made of aluminum alloy, which is fixedly connected to the upper edge of the seat 1 via a fixing rod, specifically by welding. A vertical main shaft 3 is rotatably mounted inside the fixing ring 2 via bearings. It should be noted that the rotational connection via bearings is existing technology, and its structure and principle are well known to those skilled in the art and will not be elaborated here. A first guard rod 401 and a second guard rod 402 are slidably installed at both ends of the fixing ring 2. The first guard rod 401 and the second guard rod 402 are made of modified ABS engineering plastic (with an internal steel core for strength). The first guard rod 401 and the second guard rod 402 are connected to the main shaft 3 via a first connecting assembly. The rotation of the main shaft 3 drives the first guard rod 401 to insert into the second guard rod 402, forming a closed-loop structure with the fixing ring 2.

[0015] like Figure 2 and Figure 3As shown, the first connecting assembly includes two secondary shafts 7 parallel to the main shaft 3. Both secondary shafts 7 are rotatably connected to the inner wall of the fixed ring 2 through bearings. The two secondary shafts 7 are respectively located on the left and right sides of the main shaft 3. A main gear 8 is fixedly mounted on the outer periphery of the main shaft 3, and secondary gears 36 are fixedly mounted on the outer periphery of both secondary shafts 7. Both secondary gears 36 mesh with the main gear 8. Winding rollers 35 are fixedly mounted on the outer periphery of both secondary shafts 7, and traction wires 9 are wound around the outer periphery of both winding rollers 35. The traction wires 9 are made of high-strength nylon braided rope, which has good toughness, can be repeatedly wound, and is not easy to break. The ends of the two traction wires 9 are respectively fixed to the first guard rod 401 and the second guard rod 402, specifically by welding. The winding directions of the two traction wires 9 are opposite. When the main shaft 3 rotates, the main gear 8 rotates accordingly. Since both secondary gears 36 mesh with the main gear 8, the secondary gears 36 drive the secondary shaft 7 to rotate, which in turn causes the winding roller 35 to rotate. The winding roller 35 drives the traction wire 9 to rotate, and the traction wire 9 pushes the first guard rod 401 and the second guard rod 402 closer to each other. Finally, the first guard rod 401 is inserted into the second guard rod 402, forming a closed-loop structure with the fixing ring 2. This provides closed-loop protection for the child sitting on the oval seat 1, preventing the child from accidentally falling off the high chair and endangering their life.

[0016] like Figure 2 As shown, the end of the first guard rod 401 extending out of the fixing ring 2 is fixedly connected to a plug block 30, specifically by welding. The end of the second guard rod 402 extending out of the fixing ring 2 is provided with a plug hole 31. A first magnetic block 32 is fixedly connected to the end of the plug block 30, and a second magnetic block 33 is fixedly provided on the inner wall of the plug hole 31. The first magnetic block 32 is used to attract the second magnetic block 33 inserted into the plug hole 31 as the first guard rod 401 moves. When the first guard rod 401 is inserted into the second guard rod 402, the first magnetic block 32 and the second magnetic block 33 attract each other, making the connection between the first guard rod 401 and the second guard rod 402 more secure and enhancing the protective effect.

[0017] like Figure 1 and Figure 3As shown, a pedal 5 is slidably connected to the bottom of the seat 1 along the seat depth direction. The pedal 5 is made of TPE soft rubber material (with an embedded hard PP substrate). TPE soft rubber is soft to the touch, making it more comfortable for children's feet to place, and has excellent anti-slip performance to prevent feet from slipping during meals. The pedal 5 is connected to the main shaft 3 through a second connecting component. The rotation of the main shaft 3 is also used to drive the pedal 5 to extend out of the edge of the seat 1. The second connecting assembly includes a first bevel gear 10 and a second bevel gear 11 meshing with the first bevel gear 10. A vertical connecting post 12 is connected to the lower part of the fixing ring 2. The bottom of the fixing ring 2 and the top of the connecting post 12 are fixed by welding. The main shaft 3 passes through the fixing ring 2 and is rotatably mounted inside the connecting post 12. The bottom end of the main shaft 3 is rotatably connected to the bottom wall of the connecting post 12 via a bearing. A micro servo motor is integrated at the bottom of the main shaft 3, along with a battery and a wireless remote control button (installed on the side of the fixing ring 2). The motor and the main shaft 3 are connected via a clutch, supporting "manual / electric" switching—when the remote control button is pressed, the motor drives the main shaft 3 to rotate; when the motor is disconnected, the main shaft 3 can be manually rotated to meet different scenario requirements (such as power outages or...). (Prefer manual operation), the first bevel gear 10 is fixed on the outer periphery of the rod segment inside the connecting column 12 of the main shaft 3 and located below the main gear 8. The side of the connecting column 12 is rotatably connected to a first rotating shaft 13 that is perpendicular to the main shaft 3 and has its end facing the connecting column 12 via a bearing. The second bevel gear 11 is fixed on the outer periphery of the rod segment inside the connecting column 12 via the first rotating shaft 13. The first rotating shaft 13 is a lead screw. The rod segment outside the connecting column 12 of the first rotating shaft 13 is threadedly connected to a horizontal moving block 14. The bottom surface of the seat plate 1 is provided with a first limiting groove 15 that is parallel to the seat depth direction of the seat plate 1. The top end of the horizontal moving block 14 is slidably disposed in the first limiting groove 15. The pedal 5 is connected to the bottom of the horizontal moving block 14. When the main shaft 3 rotates, it drives the first bevel gear 10 to rotate. The first bevel gear 10 meshes with the second bevel gear 11, thereby causing the second bevel gear 11 to drive the first rotating shaft 13 to rotate. Since the first rotating shaft 13 is a lead screw and is threadedly connected to the horizontal moving block 14, and the top of the horizontal moving block 14 slides in the first limiting groove 15, the rotation of the horizontal moving block 14 is restricted, so that the horizontal moving block 14 moves axially along the first rotating shaft 13, thereby driving the pedal 5 to extend out of the edge of the seat plate 1.

[0018] like Figure 1As shown, a mounting block 16 is fixedly installed on the bottom side of the horizontal moving block 14 away from the connecting column 12, specifically by welding. An electric telescopic rod 17 with its telescopic end facing upwards is rotatably connected to the mounting block 16 via a bearing. The pedal 5 is fixedly connected to the telescopic end of the electric telescopic rod 17, specifically by welding. A second limiting groove 18 is provided on the side of the horizontal moving block 14 away from the connecting column 12. A limiting block 19 is fixedly installed on the top surface of the pedal 5, specifically by welding. The limiting block 19 slides vertically within the second limiting groove 18. The electric telescopic rod 17 can drive the pedal 5 to move up and down, realizing the adjustment of the pedal 5's height to accommodate the needs of different children. The limiting block 19 slides vertically within the second limiting groove 18, ensuring the stability of the pedal 5 during up and down movement. It should be noted that the electric telescopic rod 17 can be controlled by an independent switch (it is not linked to the rotation of the main shaft 3 and is only used to adjust the height of the pedal 5).

[0019] like Figure 1 and Figure 3As shown, a lifting rod 6 is connected to the bottom of the seat 1. The lifting rod 6 is connected to the main shaft 3 via a third connecting assembly. The rotation of the main shaft 3 also drives the lifting rod 6 to extend and raise the height of the seat 1. The third connecting assembly includes two hollow support columns 20 and two sleeves 21 that are connected to the two support columns 20 one-to-one. The support columns 20 are made of glass fiber reinforced PP material, which facilitates the movement of the chair for adults. The support columns 20 and the corresponding sleeves 21 are slidably connected to form a set of support components. It also includes a base 22, which is made of high-density ABS engineering plastic (with an anti-slip silicone pad on the bottom). The ABS base 22 has a moderate weight and is impact-resistant. The anti-slip pad improves stability. The bottom ends of the two support columns 20 are fixed to the top surface of the base 22 by welding. The top ends of the two sleeves 21 are fixed to the bottom surface of the seat 1 by welding. The two sets of support components are respectively located on... On both sides of the connecting column 12, connecting rods 37 are fixedly connected between the side walls of the two sleeves 21 and the side walls of the connecting column 12, enhancing the connection stability between the sleeves 21 and the connecting column 20 and preventing displacement when the seat plate 1 is raised or lowered. Each of the two sleeves 21 is rotatably connected to a vertical second rotating shaft 23 via bearings. First sprockets 24 are fixedly mounted on the outer periphery of each of the two second rotating shafts 23. Two vertically arranged second sprockets 25 are fixedly mounted on the outer periphery of the rod segment of the main shaft 3 located inside the connecting column 12 and below the first bevel gear 10. The two first sprockets 24 correspond one-to-one with the two second sprockets 25, and chains 26 mesh between the first sprockets 24 and their corresponding second sprockets 25. Both support columns 20 are connected to... A vertical third rotating shaft 27 is rotatably connected via a bearing. A telescopic rod 34 is fixed between the second rotating shaft 23 and the corresponding third rotating shaft 27, specifically a spline fit, and secured with a lock nut. The telescopic rod 34 is a sleeve-type three-stage nested telescopic rod (which can extend and retract synchronously with the relative sliding of the sleeve 21 and the support column 20). Each sleeve has three evenly distributed guide grooves along the axial direction on its inner wall, and a guide protrusion (which mates with the groove) is provided at the corresponding position on the outer sleeve. The cooperation between the groove and the protrusion restricts the radial sway of the telescopic rod 34, ensuring a smooth extension and retraction process and avoiding jamming due to skew. The third rotating shaft 27 is a lead screw, and both third rotating shafts 27 are threaded to the outer circumference. The vertical moving blocks 28 are both in contact with the inner wall of the corresponding support column 20. The support column 20 has a sliding groove 29 on its side facing the connecting column 12. The lifting rod 6 includes an auxiliary cylinder 602 and a lifting block 601 that is vertically slidably disposed in the auxiliary cylinder 602. The auxiliary cylinder 602 is fixedly connected to the top surface of the base 22 by welding. The lifting block 601 is fixedly connected to the bottom end of the connecting column 12 by welding. The other end of each of the two vertical moving blocks 28 passes through the sliding groove 29 on the corresponding support column 20 and is fixedly connected to the lifting block 601 by welding. The two vertical moving blocks 28 are vertically slidably disposed in the sliding groove 29 on the corresponding support column 20.When the main shaft 3 rotates, it drives the second sprocket 25 to rotate, which in turn drives the first sprocket 24 to rotate via the chain 26, thereby causing the second rotating shaft 23 to rotate. The second rotating shaft 23 drives the third rotating shaft 27 to rotate via the telescopic rod 34. Since the third rotating shaft 27 is a lead screw and is threadedly connected to the vertical moving block 28, and the vertical moving block 28 abuts against the inner wall of the support column 20, the rotation of the vertical moving block 28 is restricted, causing the vertical moving block 28 to move upward along the axial direction of the third rotating shaft 27, which drives the lifting block 601 to slide upward in the auxiliary cylinder 602, thereby extending the lifting rod 6 and raising the height of the seat plate 1. At this time, due to the presence of the connecting rod 37, the lifting block 601 drives the connecting rod 37 to move upward during the upward lifting process, and the telescopic rod 34 extends accordingly. The sleeve 21 slides upward along the length direction of the support column 20, which also provides guidance and support for the lifting of the seat plate 1.

[0020] Working principle: In use, the child is placed on the seat 1, and then the adult rotates the main shaft 3. The rotation of the main shaft 3 simultaneously drives three structures to operate synchronously. Specifically, the rotation of the main shaft 3 drives the main gear 8 fixed on its outer periphery to rotate synchronously. The main gear 8 meshes with the secondary gears 36 on the two secondary shafts 7, thereby driving the two secondary shafts 7 to rotate. When the secondary shafts 7 rotate, the winding roller 35 on its outer periphery rotates the traction wire 9. The two traction wires 9 respectively push the first guard rod 401 and the second guard rod 402 to slide towards each other along the two ends of the fixing ring 2. Finally, the insertion block 30 of the first guard rod 401 is inserted into the insertion hole 31 of the second guard rod 402, and the first magnetic block 32 and the second magnetic block 33 attract each other, forming a stable closed-loop protective structure with the fixing ring 2. When the main shaft 3 rotates, the first bevel gear 10, located in the connecting column 12, rotates synchronously with the main shaft 3. The first bevel gear 10 meshes with the second bevel gear 11, driving the first rotating shaft 13 to rotate. Since the first rotating shaft 13 is a lead screw and is threadedly connected to the horizontal moving block 14, and the top of the horizontal moving block 14 is constrained by the first limiting groove 15 and cannot rotate, the horizontal moving block 14 moves axially away from the connecting column 12 along the first rotating shaft 13, thereby driving the pedal 5 to extend beyond the edge of the seat plate 1 along the seat depth direction. If the height of the pedal 5 needs to be adjusted, the pedal 5 can be moved up and down by extending and retracting the electric telescopic rod 17. The sliding of the limiting block 19 in the second limiting groove 18 ensures the stability of the pedal 5 during the lifting and lowering process. When the main shaft 3 rotates, the two second sprockets 25 at its lower part rotate synchronously, driving the first sprocket 24 on the second shaft 23 inside the sleeve 21 to rotate via the chain 26, thereby causing the second shaft 23 to rotate. The second shaft 23 drives the third shaft 27 inside the support column 20 to rotate via the telescopic rod 34. Since the third shaft 27 is a lead screw and is threadedly connected to the vertical moving block 28, and the vertical moving block 28 is constrained by the inner wall of the support column 20 and cannot rotate, the vertical moving block 28 moves upward along the axial direction of the third shaft 27. The vertical moving block 28 pushes the lifting block 601 to slide upward in the auxiliary cylinder 602 through the slide groove 29, causing the lifting rod 6 to extend. At the same time, the sleeve 21 slides upward along the support column 20 and the telescopic rod 34 extends, together driving the seat plate 1 to achieve height increase.

[0021] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An adjustable children's high chair, comprising an oval seat (1), characterized in that: It also includes a fixing ring (2), which is fixedly connected above the edge of the seat plate (1). A vertical main shaft (3) is rotatably installed inside the fixing ring (2). A first guard rod (401) and a second guard rod (402) are slidably installed in the two ends of the fixing ring (2). The first guard rod (401) and the second guard rod (402) are connected to the main shaft (3) through a first connecting assembly. The rotation of the main shaft (3) is used to drive the first guard rod (401) to insert into the second guard rod (402) and cooperate. The fixed ring (2) forms a closed loop structure; the bottom of the seat (1) is slidably connected to a pedal (5) along the seat depth direction, the pedal (5) is connected to the main shaft (3) through the second connecting component, and the rotation of the main shaft (3) is also used to drive the pedal (5) to extend out of the edge of the seat (1); the bottom of the seat (1) is connected to a lifting rod (6), the lifting rod (6) is connected to the main shaft (3) through the third connecting component, and the rotation of the main shaft (3) is also used to drive the lifting rod (6) to extend to raise the height of the seat (1).

2. The adjustable children's high chair according to claim 1, characterized in that: The first connecting assembly includes two secondary shafts (7) parallel to the main shaft (3). The two secondary shafts (7) are respectively located on the left and right sides of the main shaft (3). A main gear (8) is fixedly provided on the outer periphery of the main shaft (3). A secondary gear (36) is fixedly provided on the outer periphery of both secondary shafts (7). Both secondary gears (36) mesh with the main gear (8). A winding roller (35) is fixedly provided on the outer periphery of the two secondary shafts (7). A traction wire (9) is wound on the outer periphery of both winding rollers (35). The ends of the two traction wires (9) are respectively fixedly connected to the first guard rod (401) and the second guard rod (402).

3. An adjustable children's high chair according to claim 1, characterized in that: The second connecting assembly includes a first bevel gear (10) and a second bevel gear (11) meshing with the first bevel gear (10). The lower part of the fixing ring (2) is connected to a vertical connecting column (12). The main shaft (3) passes through the fixing ring (2) and is rotatably disposed within the connecting column (12). The first bevel gear (10) is fixed on the outer periphery of the rod segment of the main shaft (3) disposed within the connecting column (12) and is disposed below the main gear (8). The side of the connecting column (12) is rotatably connected to a first bevel gear (11) that is perpendicular to the main shaft (3) and whose end faces the connecting column (12). A rotating shaft (13) is provided. The second bevel gear (11) is fixed on the outer periphery of the rod segment located inside the connecting column (12) of the first rotating shaft (13). The first rotating shaft (13) is a lead screw. The rod segment of the first rotating shaft (13) located outside the connecting column (12) is threadedly connected to a horizontal moving block (14). The bottom surface of the seat plate (1) is provided with a first limiting groove (15) parallel to the seat depth direction of the seat plate (1). The top end of the horizontal moving block (14) is slidably located in the first limiting groove (15). The pedal (5) is connected to the bottom of the horizontal moving block (14).

4. An adjustable children's high chair according to claim 3, characterized in that: The horizontal moving block (14) is fixedly provided with a mounting block (16) on the side bottom away from the connecting column (12). An electric telescopic rod (17) with its telescopic end facing upward is rotatably connected to the mounting block (16). The pedal (5) is fixedly connected to the telescopic end of the electric telescopic rod (17). A second limiting groove (18) is provided on the side away from the connecting column (12). A limiting block (19) is fixedly provided on the top surface of the pedal (5). The limiting block (19) is vertically slidably disposed in the second limiting groove (18).

5. An adjustable children's high chair according to claim 1, characterized in that: The third connecting assembly includes two hollow support columns (20) and two sleeves (21) that are connected to each of the two support columns (20). The support columns (20) and the corresponding sleeves (21) are slidably connected to form a set of support assemblies. It also includes a base (22). The bottom ends of the two support columns (20) are fixed to the top surface of the base (22), and the top ends of the two sleeves (21) are fixed to the bottom surface of the seat plate (1). The two sets of support assemblies are respectively located on both sides of the connecting column (12). The side walls of the two sleeves (21) are connected to the side of the connecting column (12). Connecting rods (37) are fixed between the walls. Vertical second shafts (23) are rotatably connected inside the two sleeves (21). First sprockets (24) are fixed on the outer periphery of the two second shafts (23). Two second sprockets (25) are fixed on the outer periphery of the rod segment of the main shaft (3) located inside the connecting column (12) and below the first bevel gear (10). The two first sprockets (24) correspond one-to-one with the two second sprockets (25), and the first sprockets (24) mesh with the corresponding second sprockets (25). The system includes a chain (26), and two support columns (20) are rotatably connected to a vertical third shaft (27). A telescopic rod (34) is fixed between the second shaft (23) and the corresponding third shaft (27). The third shaft (27) is a lead screw. Both third shafts (27) are threaded with vertical moving blocks (28) on their outer circumferences. Both vertical moving blocks (28) abut against the inner wall of the corresponding support column (20). The support column (20) has a sliding groove (29) on its side facing the connecting column (12). The lifting rod (6) includes an auxiliary cylinder (602) and a lifting block (601) that is vertically slidably disposed in the auxiliary cylinder (602). The auxiliary cylinder (602) is fixedly connected to the top surface of the base (22), and the lifting block (601) is fixedly connected to the bottom end of the connecting column (12). The other ends of the two vertical moving blocks (28) are both passed through the sliding groove (29) on the corresponding support column (20) and fixedly connected to the lifting block (601). The two vertical moving blocks (28) are vertically slidably disposed in the sliding groove (29) on the corresponding support column (20).

6. An adjustable children's high chair according to claim 2, characterized in that: The end of the first guard rod (401) extending out of the fixing ring (2) is fixedly connected to a plug block (30), and the end of the second guard rod (402) extending out of the fixing ring (2) is provided with a plug hole (31). The end of the plug block (30) is fixedly connected to a first magnetic block (32), and the inner wall of the plug hole (31) is fixedly provided with a second magnetic block (33). The first magnetic block (32) is used to attract the second magnetic block (33) inserted into the plug hole (31) as the first guard rod (401) moves.

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