Child safety seat

Abstract

The child safety seat comprises a backrest and a head support assembly, an open groove with the upper portion and the front portion open is formed in the backrest, the head support assembly comprises a head support arranged in the open groove in an up-down sliding mode, and when the head support slides upwards, a hollow area is formed between the lower end of the head support and the lower end of the open groove. The child safety seat further comprises a shielding assembly movably arranged between the backrest and the head support assembly, and when the head support slides upwards, the hollow area is filled with the shielding assembly. According to the child safety seat, when a hollow area appears below the head support due to the fact that the head support slides upwards due to the height of a used child, the shielding assembly can fill the hollow area along with movement of the head support, the front end face of the shielding assembly is approximately flush with the front end face of the backrest, and therefore the lower portion of the head support is of a flat structure all the time; according to the child safety seat, a large supporting face can be provided for the back of a child to lean on, so that the child safety seat is good in riding comfort, complete in overall structure and good in attractiveness.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile products, specifically relates to a child safety seat. BACKGROUND

[0002] In order to improve the safety performance of children riding in a car, a child safety seat is generally used. The child safety seat generally comprises a seat, a backrest connected with the seat and a headrest assembly arranged on the backrest. In order to make the child safety seat suitable for children of different heights and ages, the headrest assembly is generally slidable up and down on the backrest. In the prior art, when the headrest assembly slides upward, a cavity appears at the lower part of the headrest assembly, which affects the appearance and comfort of the child safety seat. SUMMARY

[0003] The utility model aims at the deficiency in the prior art and provides a child safety seat with good comfort and appearance.

[0004] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of:

[0005] A child safety seat comprises a backrest and a headrest assembly. The backrest is provided with an upper part and a front open slot. The headrest assembly comprises a headrest which is arranged in the slot and is slidable up and down. When the headrest is in the lowest gear, the lower end of the headrest is close to the lower end of the slot. When the headrest slides upward, a hollow area is formed between the lower end of the headrest and the lower end of the slot. The child safety seat further comprises a shielding assembly which is movably arranged between the backrest and the headrest assembly. When the headrest slides upward, the shielding assembly is filled in the hollow area.

[0006] In some embodiments, the shielding assembly comprises a stretchable part with elasticity and a shielding part arranged on the stretchable part. The stretchable part has a first fixed end and a second fixed end. The first fixed end is fixedly arranged at the lower part of the backrest, and the second fixed end is fixedly arranged at the lower end of the slot. The shielding part extends from the second fixed end of the stretchable part along the extension direction of the stretchable part. The upper part of the headrest assembly is provided with a first winding part. The part of the stretchable part between the first fixed end and the second fixed end and the shielding part are movably wound through the first winding part. When the headrest slides upward, the stretchable part and the shielding part between the second fixed end and the first winding part are filled in the hollow area.

[0007] In some embodiments, the length of the shielding part extending along the stretchable part is not less than the height of the slot in the up-down direction.

[0008] In some embodiments, a lower portion of the backrest is provided with a second winding portion, the second winding portion is located at a lower portion of the first fixed end, and the stretching portion is movably wound through the second winding portion between the first fixed end and the first winding portion.

[0009] In some embodiments, the headrest assembly further comprises a first baffle fixedly arranged at a lower portion of the headrest and a second baffle slidably arranged on the first baffle, and the first winding portion is fixedly arranged at an upper portion of the first baffle.

[0010] In some embodiments, a limiting structure for limiting relative sliding between the first baffle and the second baffle is arranged therebetween, the limiting structure comprises a first protrusion arranged on the first baffle and a second protrusion arranged on the second baffle, and the first protrusion and the second protrusion are disengageably matched.

[0011] In some embodiments, the child safety seat further comprises a first driving mechanism for driving the headrest to slide up and down, the first driving mechanism comprises a first motor, a first screw rod connected with a motor shaft of the first motor, and a first nut threadedly matched with the first screw rod, and the first nut is fixedly arranged on the headrest.

[0012] In some embodiments, the child safety seat further comprises a support assembly slidably arranged on the backrest, and the headrest assembly is arranged on the support assembly.

[0013] In some embodiments, the child safety seat further comprises a second driving mechanism for driving the support assembly to slide up and down relative to the backrest, the second driving mechanism comprises a second motor, a second screw rod connected with a motor shaft of the second motor, and a second nut threadedly matched with the second screw rod, and the second nut is fixedly arranged on the support assembly.

[0014] In some embodiments, the child safety seat further comprises a first guide mechanism for guiding the headrest to slide up and down and a second guide mechanism for guiding the support assembly to slide up and down.

[0015] The first guide mechanism comprises a first guide rail arranged on the headrest and a second guide rail arranged on the support assembly, and the first guide rail is slidably arranged on the second guide rail in the up-down direction.

[0016] The second guide mechanism comprises a third guide rail arranged on the support assembly and a fourth guide rail arranged on the backrest, and the third guide rail is slidably arranged on the fourth guide rail in the up-down direction.

[0017] With the technical scheme, the utility model has the following advantages compared with the prior art: when the head support in the children safety seat of the utility model slides upward due to the height of the child using it, the hollow area below the head support appears, the shielding assembly fills the hollow area along with the movement of the head support, the front end face of the shielding assembly is approximately flush with the front end face of the backrest, the structure below the head support is always flat, a larger supporting surface is provided for the back of the child, the comfort of the children safety seat is better when the child rides in it, the overall structure of the children safety seat is complete, and the aesthetic property is better. BRIEF DESCRIPTION OF DRAWINGS

[0018] BRIEF DESCRIPTION OF DRAWINGS Figure 1 It is a perspective view of the children safety seat of the embodiment when the head support is in the lowest gear;

[0019] BRIEF DESCRIPTION OF DRAWINGS Figure 2 It is a front view of the children safety seat of the embodiment when the head support is in the lowest gear;

[0020] BRIEF DESCRIPTION OF DRAWINGS Figure 3 It is a sectional view along line A-A; Figure 2 BRIEF DESCRIPTION OF DRAWINGS

[0021] It is a perspective view of the children safety seat of the embodiment when the head support is in the lowest gear after part of the structure is removed (seen from front to back); Figure 4 BRIEF DESCRIPTION OF DRAWINGS

[0022] It is a perspective view of the children safety seat of the embodiment when the head support is in the lowest gear after part of the structure is removed (seen from back to front); Figure 5 BRIEF DESCRIPTION OF DRAWINGS

[0023] It is an exploded view of the children safety seat of the embodiment when the head support is in the lowest gear after part of the structure is removed; Figure 6 BRIEF DESCRIPTION OF DRAWINGS

[0024] It is a perspective view of the children safety seat of the embodiment when the head support is in the middle gear; Figure 7 BRIEF DESCRIPTION OF DRAWINGS

[0025] It is a front view of the children safety seat of the embodiment when the head support is in the middle gear; Figure 8 BRIEF DESCRIPTION OF DRAWINGS

[0026] It is a sectional view along line A-A; Figure 9 Figure 8 BRIEF DESCRIPTION OF DRAWINGS

[0027] BRIEF DESCRIPTION OF DRAWINGS Figure 10 It is a perspective view of the children safety seat of the embodiment when the head support is in the middle gear after part of the structure is removed (seen from front to back);

[0028] BRIEF DESCRIPTION OF DRAWINGS Figure 11 ​Fig. 6 is a perspective view of the headrest of the child safety seat of the present embodiment in the middle position, with parts removed for clarity (viewed from the front);

[0029] Fig. 7 is a front view of the headrest of the child safety seat of the present embodiment in the middle position; Figure 12

[0030] Fig. 8 is a perspective view of the headrest of the child safety seat of the present embodiment in the highest position; Figure 13

[0031] Fig. 9 is a front view of the headrest of the child safety seat of the present embodiment in the highest position; Figure 14 Figure 13 Fig. 10 is a cross-sectional view along line A-A;

[0032] Fig. 11 is a perspective view of the headrest assembly and the shielding assembly of the child safety seat of the present embodiment in the lowest position (viewed from the front); Figure 15 Fig. 12 is a perspective view of the headrest assembly and the shielding assembly of the child safety seat of the present embodiment in the lowest position (viewed from the rear);

[0033] Figure 16 Fig. 13 is a front view of the headrest assembly and the shielding assembly of the child safety seat of the present embodiment in the lowest position;

[0034] Fig. 14 is a perspective view of the first and second baffles of the child safety seat of the present embodiment in the lowest position; Figure 17 Fig. 15 is a perspective view of the headrest assembly and the shielding assembly of the child safety seat of the present embodiment in the middle position (viewed from the front);

[0035] Figure 18 Fig. 16 is a perspective view of the headrest assembly and the shielding assembly of the child safety seat of the present embodiment in the middle position (viewed from the rear);

[0036] Fig. 17 is a front view of the headrest assembly and the shielding assembly of the child safety seat of the present embodiment in the middle position; Figure 19 Fig. 18 is a perspective view of the first and second baffles of the child safety seat of the present embodiment in the middle position;

[0037] Figure 20 Fig. 19 is a cross-sectional view along line A-A; Figure 19 Fig. 20 is a perspective view of the headrest assembly and the shielding assembly of the child safety seat of the present embodiment in the highest position (viewed from the front);

[0038] Figure 21 Fig. 21 is a perspective view of the headrest assembly and the shielding assembly of the child safety seat of the present embodiment in the highest position (viewed from the rear);

[0039] Fig. 22 is a front view of the headrest assembly and the shielding assembly of the child safety seat of the present embodiment in the highest position; Figure 22 Fig. 23 is a perspective view of the first and second baffles of the child safety seat of the present embodiment in the highest position;

[0040] Figure 23 Fig. 24 is a cross-sectional view along line A-A;

[0041] Fig. 25 is a front view of the child safety seat of the present embodiment in the highest position; Figure 24 Fig. 26 is a perspective view of the child safety seat of the present embodiment in the highest position;​​​​​​​​

[0042] Appendix Figure 25 For the appendix Figure 24 sectional view along line AA;

[0043] Appendix Figure 26 This is a three-dimensional schematic diagram of the first and second baffles when the headrest is in the middle and highest positions in this embodiment.

[0044] The components are as follows: 1. Seat; 2. Backrest; 21. Slot; 211. Lower end of slot; 22. Second winding part; 3. Headrest assembly; 31. Headrest; 32. First winding part; 33. First baffle; 331. First protrusion; 34. Second baffle; 341. Second protrusion; 4. Covering assembly; 41. Tensioning part; 411. First fixed end; 412. Second fixed end; 42. Covering part; 5. Support assembly; 61. First motor; 62. First lead screw; 63. First lead screw nut; 71. Second motor; 72. Second lead screw; 73. Second lead screw nut; 81. First guide rail; 82. Second guide rail; 91. Third guide rail; 92. Fourth guide rail. Detailed Implementation

[0045] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0046] In the following description, the directions "front," "back," "left," "right," "up," and "down" all refer to... Figure 3 In the figure, the right direction is "front", the left direction is "rear", the upper direction is "up", and the lower direction is "down". The directions perpendicular to the paper are "left" and "right". The above definitions of directions are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0047] like Figures 1-16 As shown, the child safety seat of this utility model includes a seat 1, a backrest 2 connected to the seat 1, and a headrest assembly 3 disposed on the backrest 2.

[0048] The backrest 2 is provided with an open slot 21 at the top and front. The headrest assembly 3 includes a headrest 31 for the child's head to lean against. The headrest 31 is slidably disposed in the slot 21.

[0049] When the headrest 31 slides down along the slot 21 to the lowest position, the lower end of the headrest 31 is close to the lower end 211 of the slot, where close means that the lower end of the headrest 31 abuts against the lower end 211 of the slot or there is a small gap between the lower end of the headrest 31 and the lower end 211 of the slot. When the headrest 31 slides up from the lowest position, a hollow region is formed between the lower end of the headrest 31 and the lower end of the slot 21. As the headrest 31 continuously slides up, the size of the hollow region gradually increases.

[0050] The child safety seat further comprises a shielding assembly 4 movably arranged between the backrest 2 and the headrest assembly 3. When the headrest 31 slides up, the shielding assembly 4 fills in the hollow region described above, and the front end face of the shielding assembly 4 is approximately flush with the front end face of the backrest 2. As the headrest 31 continuously slides up, the shielding assembly 4 can always fill the hollow region. This makes the lower part of the headrest 31 always a flat structure, thereby providing a larger support surface for the child to lean against, which makes the child safety seat more comfortable to ride, and the overall structure of the child safety seat is complete, and the aesthetic property is also better.

[0051] Specifically, as shown in Figures 17-20 、 Figures 22-25 The shielding assembly 4 comprises an elastic stretch part 41 and a shielding part 42 arranged on the stretch part 41. The stretch part 41 has a first fixed end 411 and a second fixed end 412, the first fixed end 411 is fixedly arranged at the lower part of the backrest 2, and the second fixed end 412 is fixedly arranged at the lower end 211 of the slot. In this embodiment, the first fixed end 411 and the second fixed end 412 are two end heads of the stretch part 41. The shielding part 42 extends from the second fixed end 412 of the stretch part 41 along the extension direction of the stretch part 41. The upper part of the headrest assembly 3 is provided with a first winding part 32, and the part of the stretch part 41 between the first fixed end 411 and the second fixed end 412 and the shielding part 42 are movably wound through the first winding part 32.

[0052] The lower part of the backrest 2 is fixedly provided with a second winding part 22, the second winding part 22 is located below the first fixed end 411, and the part of the stretch part 41 between the first fixed end 411 and the first winding part 32 movably winds through the second winding part 22.

[0053] When the headrest 31 is at the lowest gear, the stretch part 41 is in tension, the first winding part 32 is close to the lower end of the slot 21, so that the shielding part 42 is mostly located between the first winding part 32 and the second winding part 22. When the headrest 31 slides upward, the distance between the first winding part 32 and the second winding part 22 increases, the distance between the first winding part 32 and the second fixed end 412 increases, the stretch part 41 is elongated, and the shielding part 42 gradually passes the first winding part 32 and is located between the first winding part 32 and the second fixed end 412. The stretch part 41 and the shielding part 42 that pass the first winding part 32 fill the hollow area formed between the lower end of the headrest 31 and the lower end 211 of the slot.

[0054] The length of the shielding part 42 extending along the stretch part 41 is not less than the height of the slot 21 in the up-down direction, which makes the shielding part 42 able to fill the hollow area.

[0055] The stretch part 41 can adopt a rubber band with a certain width. The shielding part 42 can adopt a composite sponge, which has a certain flexibility to follow the movement of the stretch part 41 around the first winding part 32, and also has a certain strength to support the back of the child.

[0056] The headrest assembly 3 further comprises a first baffle 33 and a second baffle 34, the first baffle 33 is fixedly arranged at the lower part of the headrest 31, and the second baffle 34 is arranged on the first baffle 31 in a slideable manner. The first winding part 32 is fixedly arranged at the upper end of the first baffle 33. When the first baffle 33 and the second baffle 34 slide relative to each other, the headrest 31 slides along the slot 21 in an up-down direction.

[0057] A limiting structure is arranged between the first baffle 33 and the second baffle 34 to limit the relative sliding between the first baffle 33 and the second baffle 34. The limiting structure comprises a first protrusion 331 arranged on the first baffle 33 and a second protrusion 341 arranged on the second baffle 34, and the first protrusion 331 and the second protrusion 341 can be disengageably matched. Specifically, when the headrest 31 is at the lowest gear, the first baffle 33 and the second baffle 34 are close to each other, the first protrusion 331 is away from the second protrusion 341, as shown in FIG. 4A. When the first baffle 33 and the second baffle 34 slide to the maximum limit position in the direction away from each other, the first protrusion 331 and the second protrusion 341 abut to limit, and also prevent the first baffle 33 from being separated from the second baffle 34, as shown in FIG. 4B. Figure 21 Figure 26

[0058] ​​The child safety seat further comprises a support assembly 5, which is arranged on the backrest 2 in a slidable manner, and the headrest assembly 3 is arranged on the support assembly 5. In this way, when the support assembly 5 slides up and down relative to the backrest 2, the headrest assembly 3 also slides up and down along the slot 21 relative to the backrest 2, thereby increasing the adjustment range of the headrest 31 sliding up and down, and the child safety seat can be suitable for children of a larger age span, and the applicability of the child safety seat can be improved.

[0059] The child safety seat further comprises a first driving mechanism, which is used to drive the headrest 31 to slide up and down, i.e., to drive the relative sliding between the first baffle 33 and the second baffle 34.

[0060] In this embodiment, the first driving mechanism comprises a first motor 61, a first screw rod 62, and a first nut 63. The first motor 61 is fixedly arranged on the support assembly 5. The first screw rod 62 extends in the up-down direction, and the first screw rod 62 is connected with the motor shaft of the first motor 61, so as to drive the first screw rod 62 to rotate relative to the support assembly 5 through the first motor 61. The first nut 63 is threadedly connected with the first screw rod 62, and the first nut 63 is fixedly arranged on the headrest 31. When the first motor 61 is started, the first screw rod 62 is driven to rotate, so that the first nut 63 slides along the first screw rod 62, and the headrest 31 is driven to slide synchronously, so that the first baffle 33 slides relative to the second baffle 34.

[0061] The first driving mechanism is not limited to the structure in this embodiment, and other structures can also be adopted.

[0062] The child safety seat further comprises a second driving mechanism, which is used to drive the support assembly 5 to slide up and down relative to the backrest 2.

[0063] In this embodiment, the second driving mechanism comprises a second motor 71, a second screw rod 72, and a second nut 73. The second motor 71 is fixedly arranged on the backrest 2. The second screw rod 72 extends in the up-down direction, and the second screw rod 72 is connected with the motor shaft of the second motor 71, so as to drive the second screw rod 72 to rotate relative to the backrest 2 through the second motor 71. The second nut 73 is threadedly connected with the second screw rod 72, and the second nut 73 is fixedly arranged on the support assembly 5. When the second motor 71 is started, the second screw rod 72 is driven to rotate, so that the second nut 73 slides along the second screw rod 72, and the support assembly 5 is driven to slide synchronously.

[0064] The second driving mechanism is not limited to the structure in this embodiment, and other structures can also be adopted.

[0065] The child safety seat further comprises a first guiding mechanism for guiding the up-and-down sliding of the headrest 31. In this embodiment, the first guiding mechanism comprises a first guide rail 81 fixedly arranged relative to the headrest 31 and a second guide rail 82 fixedly arranged on the support assembly 5, both of which extend in the up-and-down direction, and the first guide rail 81 is slidably arranged on the second guide rail 82 in the up-and-down direction.

[0066] The child safety seat further comprises a second guiding mechanism for guiding the up-and-down sliding of the support assembly 5. In this embodiment, the second guiding mechanism comprises a third guide rail 91 fixedly arranged on the support assembly 5 and a fourth guide rail 92 fixedly arranged on the backrest 2, both of which extend in the up-and-down direction, and the third guide rail 91 is slidably arranged on the fourth guide rail 92 in the up-and-down direction.

[0067] In this embodiment, the first guiding mechanism and the second guiding mechanism are both arranged on the left and right sides, which makes the up-and-down sliding of the headrest 31 and the support assembly 5 more stable.

[0068] The height adjustment mode of the headrest 31 when the child safety seat is in use is as follows:

[0069] When the headrest 31 is in the lowest gear, the lower end of the headrest 31 is close to the lower end 211 of the slot, at this time, the shielding part 42 is located below the slot 21 and is accommodated in the backrest 2, and most of the shielding part 42 is located between the first winding part 32 and the second winding part 22, as shown in Figures 1-5 , Figures 17-20 .

[0070] The first motor 61 is started to drive the first lead screw 62 to rotate, so that the first nut 63 slides upward along the first lead screw 62, driving the headrest 31 to slide upward synchronously, so that the first baffle 33 slides upward relative to the second baffle 34 until the first protruding part 331 and the second protruding part 341 abut and cooperate, at this time, the first driving mechanism cannot drive the headrest 31 to continue to slide upward, and the headrest 31 is in the intermediate gear. When the headrest 31 drives the first baffle 33 to slide upward, a hollow region is formed between the lower end of the headrest 31 and the lower end 211 of the slot, and as the headrest 31 continuously slides upward, the size of the hollow region gradually increases. At the same time, the first winding part 32 moves upward synchronously with the first baffle 33, so that the distance between the first winding part 32 and the second winding part 22 increases, and the distance between the first winding part 32 and the second fixed end 412 increases, the stretching part 41 is elongated, and the shielding part 42 is partially located between the first winding part 32 and the second winding part 22, the stretching part 41 and the shielding part 42 partially pass through the first winding part 32 and fill in the hollow region formed between the lower end of the headrest 31 and the lower end 211 of the slot. As shown in Figures 7-11 , Figures 22-25 .

[0071] When the second motor 71 is started, the second screw rod 72 is driven to rotate, so that the second nut 73 slides upward along the second screw rod 72, the support assembly 5 is synchronously driven to slide upward, and the head support assembly 3 is driven to slide upward as a whole. The size of the hollow area formed between the lower end of the head support 31 and the lower end 211 of the slot continues to increase, the first winding part 32 continues to move upward with the head support assembly 3, the stretching part 41 continues to be stretched, the stretching part 41 and the shielding part 42 continue to pass through the first winding part 32 and fill the hollow area formed between the lower end of the head support 31 and the lower end 211 of the slot, until the support assembly 5 slides upward to the maximum limit position, that is, the head support 31 is in the highest gear, at this time, the size of the hollow area formed between the lower end of the head support 31 and the lower end 211 of the slot is the largest, and the shielding part 42 is mostly located between the first winding part 32 and the second fixed end 412, so as to fill the hollow area together with the stretching part 41, as shown in Figures 12-16 .

[0072] When it is necessary to adjust the height of the head support 31 by sliding downward, the first motor 61 and the second motor 71 are only required to be reversely rotated. When the head support 31 slides downward, the distance between the first winding part 32 and the second winding part 22 decreases, the elastic force of the stretching part 41 makes the stretching part shorten, so that the shielding part 42 reversely moves and gradually separates from the hollow area, so that the shielding part 42 does not hinder the downward sliding of the head support 31.

[0073] The above embodiments are only for illustrating the technical concept and characteristics of the present application, the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and it cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A child safety seat, characterized in that: The child safety seat includes a backrest and a headrest assembly. The backrest has an open slot at the top and front. The headrest assembly includes a headrest that can slide up and down in the slot. When the headrest is in its lowest position, the lower end of the headrest is close to the lower end of the slot. When the headrest slides upward, a hollow area is formed between the lower end of the headrest and the lower end of the slot. The child safety seat also includes a shielding assembly that is movably disposed between the backrest and the headrest assembly. When the headrest slides upward, the shielding assembly fills the hollow area.

2. The child safety seat according to claim 1, characterized in that: The shielding assembly includes an elastic stretching portion and a shielding portion disposed on the stretching portion. The stretching portion has a first fixed end and a second fixed end. The first fixed end is fixedly disposed on the lower part of the backrest, and the second fixed end is fixedly disposed on the lower end of the slot. The shielding portion extends from the second fixed end of the stretching portion along the extending direction of the stretching portion. The upper part of the headrest assembly is provided with a first winding portion. The portion of the stretching portion located between the first fixed end and the second fixed end and the shielding portion both movably wrap around the first winding portion. When the headrest slides upward, the stretching portion and the shielding portion located between the second fixed end and the first winding portion fill the hollow area.

3. The child safety seat according to claim 2, characterized in that: The length of the shielding portion extending along the stretching portion is not less than the height of the slot along the vertical direction.

4. The child safety seat according to claim 2, characterized in that: The lower part of the backrest is fixedly provided with a second winding part, which is located below the first fixed end. The portion of the stretching part located between the first fixed end and the first winding part moves around the second winding part.

5. The child safety seat according to claim 2, characterized in that: The headrest assembly further includes a first baffle fixedly disposed at the lower part of the headrest and a second baffle that can slide up and down on the first baffle, and the first winding part is fixedly disposed at the upper part of the first baffle.

6. The child safety seat according to claim 5, characterized in that: A limiting structure is provided between the first baffle and the second baffle to limit the relative sliding between them. The limiting structure includes a first protrusion on the first baffle and a second protrusion on the second baffle, and the first protrusion and the second protrusion can be detachably engaged.

7. The child safety seat according to claim 5, characterized in that: The child safety seat also includes a first drive mechanism for driving the headrest to slide up and down. The first drive mechanism includes a first motor, a first lead screw connected to the motor shaft of the first motor, and a first nut that is threadedly engaged with the first lead screw. The first nut is fixedly mounted on the headrest.

8. The child safety seat according to claim 1, characterized in that: The child safety seat also includes a support assembly that can slide up and down on the backrest, and the headrest assembly is disposed on the support assembly.

9. The child safety seat according to claim 8, characterized in that: The child safety seat also includes a second drive mechanism for driving the support assembly to slide up and down relative to the backrest. The second drive mechanism includes a second motor, a second lead screw connected to the motor shaft of the second motor, and a second nut that is threadedly engaged with the second lead screw. The second nut is fixedly mounted on the support assembly.

10. The child safety seat according to claim 8, characterized in that: The child safety seat also includes a first guide mechanism for guiding the up-and-down sliding of the headrest and a second guide mechanism for guiding the up-and-down sliding of the support assembly. The first guide mechanism includes a first guide rail disposed on the headrest and a second guide rail disposed on the support assembly, wherein the first guide rail is slidably disposed on the second guide rail in the vertical direction; The second guiding mechanism includes a third guide rail disposed on the support assembly and a fourth guide rail disposed on the backrest, wherein the third guide rail is slidably disposed on the fourth guide rail in the vertical direction.

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