CN209776242U - Child safety seat for vehicle - Google Patents

Abstract

The utility model discloses a child safety seat for vehicles, which comprises a base and a seat back and is characterized in that the base is provided with a rotating concave cavity, a turntable is rotatably arranged in the rotating concave cavity, and the seat back can be arranged on the turntable in a sliding way and can rotate along with the turntable relative to the base; top-down cross-under is provided with the gag lever post on the back of the chair, be provided with spacing guide slot in the rotation cavity, be provided with the direction spout on the carousel, the lower extreme of gag lever post passes the direction spout and can set up in spacing guide slot with sliding, spacing guide slot includes circular direction section and the spacing section of sharp form, circular direction section is coaxial with the carousel and will rotate the cavity and separate for rotating the outer lane and rotating the inner circle, the setting of the spacing section of sharp form is in rotating the inner circle and set up from front to back along the back slip direction of the back of the chair, the front end and the circular direction section intercommunication of the spacing section of sharp form, the rear end of the spacing. Has the advantages of simple structure, convenient operation, time saving and labor saving.

Description

child safety seat for vehicle

Technical Field

the utility model relates to a child safety seat for vehicle.

Background

As more and more families have private cars, driving and traveling become a preferred traveling mode for many families. To having child's family at the trip in-process, all can choose a money children safety seat for use to install on car seat in order to ensure children's safety of taking the car, supply children to use, be used for guaranteeing children's safety.

in order to ensure the safety of children of different ages in the process of using the child-mounting seat, the child safety seat is generally required to be reversely mounted for an infant of 0-15 months, namely, the child is back to the seat back of the automobile seat after sitting on the seat, and for an infant of more than 15 months, the child safety seat is required to be normally mounted, namely, the child is facing to the seat back of the driver seat after sitting on the seat back. In order to conveniently realize the forward and reverse installation of the chair back, most of the chair backs of the currently designed child safety seats can directly realize forward and reverse rotation relative to the base, the existing child safety seats can generally adjust the angle of the chair back according to specific use requirements, the common child installation seats on the market at present can realize the adjustment of the angle of the chair back and can realize the direct forward and reverse installation of the chair back, no matter the chair back is installed in a forward direction or a reverse direction, the chair back can be adjusted in multiple angles, and aiming at the infants of 0-15 months, under the premise of reverse installation of the seat, the chair back needs to be adjusted to the angle which can enable the infants to lie flat, namely, under the state of reverse installation of the chair back, only the angle of the chair back which is nearly lying flat needs to be fixed, and the adjustment of other angles is not needed. To the children's safety seat of current structure, because the back of the chair no matter forward installation or reverse installation, all can carry out the multi-angle and adjust, to the user that uses for the first time, with regard to the back of the chair use angle of holding reverse installation too well, need adjust many times and feel on probation just can find the use angle that is the most comfortable repeatedly, it is comparatively inconvenient to operate.

Disclosure of Invention

The utility model aims to solve the technical problem that a need not extra adjustment after simple structure, the operation is convenient, reverse installation and can reach the automobile-used children's safety seat of adaptation use angle.

The utility model provides a technical scheme that above-mentioned technical problem adopted does:

a child safety seat for a vehicle comprises a base and a seat back arranged on the base, wherein a rotating cavity is arranged on the base, a rotating disc is rotatably arranged in the rotating cavity, and the seat back can be arranged on the rotating disc in a front-back sliding mode and can rotate relative to the base along with the rotating disc;

A chair back angle adjusting mechanism is arranged between the chair back and the turntable and comprises an angle adjusting block capable of being lifted up and down, a locking block is arranged at the bottom of the angle adjusting block, a plurality of locking grooves matched with the locking block are formed in the turntable along the front-back sliding direction of the chair back, and an adjusting handle for lifting the angle adjusting block up and down is arranged on the angle adjusting block;

The seat back is provided with a limiting rod in a penetrating manner from top to bottom, a limiting guide groove is arranged in the rotating cavity, a guide sliding groove is arranged on the turntable along the front-back sliding direction of the seat back, the lower end of the limiting rod penetrates through the guide sliding groove and can be arranged in the limiting guide groove in a sliding manner, the limiting guide groove comprises a circular guide section and a linear limiting section, the circular guide section is coaxial with the turntable and divides the rotating cavity into a rotating outer ring and a rotating inner ring, the linear limiting section is arranged on the rotating inner ring and is arranged from front to back along the front-back sliding direction of the seat back, the front end of the linear limiting section is communicated with the circular guide section, and the rear end of the linear limiting section is positioned in front of the central axis of the turntable;

When the lower end of the limiting rod is positioned at the last end of the linear limiting section and in the circular guide section, the lower end of the limiting rod is respectively positioned at two limit positions for angle adjustment of the chair back.

The linear limit section is two, two the linear limit section is arranged at intervals side by side, the limit rod comprises two vertical limit parts arranged side by side and arranged at intervals, the upper end of each limit part is connected with a connecting part transversely arranged, the rotary disc is provided with two linear limit section positions matched with the guide sliding grooves arranged side by side and arranged at intervals, and the lower end of each limit part penetrates through the corresponding position of each guide sliding groove and is arranged in the linear limit section corresponding to the position. The limiting rod is simple in structure, the two limiting parts are used for limiting, and the connecting part is used for connecting and installing.

The bottom of carousel protruding downwards be provided with coaxial erection column, the rotation cavity in be provided with erection column matched with the mounting hole that link up from top to bottom, the erection column rotationally stretch into install the mounting hole in, just the lower part of erection column stretch out the mounting hole and the coaxial fixed connection of an installation carousel, the external diameter of installation carousel be greater than the internal diameter of mounting hole.

The lower end face of the mounting column is provided with a mounting slot, the upper end face of the mounting turntable is provided with a mounting lug matched with the mounting slot, and the mounting lug is inserted into the mounting slot. The installation prepositioning of the turntable on the installation turntable is realized through the insertion and connection matching between the installation slot and the installation lug, so that the fixed assembly between the turntable and the installation turntable is facilitated.

a locking mechanism for locking the position of the rotary table is arranged between the base and the rotary table; four locking grooves are uniformly distributed on the side part of the rotary table along the circumference, and the four locking grooves respectively and correspondingly enable the chair back to be at the positions of 0 degree, 90 degrees, 180 degrees and 270 degrees; the locking mechanism comprises a locking handle, a locking lug matched with the locking groove is arranged on the locking handle, the locking handle can be arranged on the base in a front-back pulling mode, a reset mechanism enabling the locking handle to reset is arranged between the locking handle and the base, the locking lug is arranged in one of the locking grooves in a locking state, when the locking handle needs to rotate, the locking handle is pulled forwards, the locking lug is made to break away from the locking groove, after the rotation adjustment is completed, the pulling force applied to the locking handle is removed, and the locking handle is driven by the reset mechanism to reset so that the locking lug is clamped into the locking groove to lock the position of the upper turntable. Through the cooperation of the lock position lug on lock position recess and the lock position handle, realize the lock position of the back of the chair in four positions of 0 °, 90 °, 180 ° and 270 °, simple structure, the lock position is stable, and convenient operation, the canceling release mechanical system that sets up between lock position handle and the base makes the position locking of the lock position handle with the back of the chair fixed that can reset fast.

The locking handle comprises a locking handle part, the upper end surface of the locking handle part is downwards recessed to form a hollow guide part protruding downwards, a guide groove is arranged on the base, the guide part can be movably arranged in the guide groove in a front-back manner, the rear end of the locking handle part is connected with a lock tongue, the upper end surface of the lock tongue is upwards convexly provided with the locking lug, the rear end head of the lock tongue is downwards bent to form a vertical first bending part, the rear end head of the first bending part is backwards bent to form a horizontal second bending part, the base is provided with a guide hole penetrating up and down, the guide hole is positioned behind the guide groove, the upper part of the inner side wall at the rear end of the guide hole extends forwards to form a limit baffle, and the second bending part is arranged below the limit baffle, the first bending part is positioned at the front end of the limiting baffle, the resetting mechanism is a resetting pressure spring, the resetting pressure spring is transversely arranged between the inner side wall of the second bending part and the inner side wall of the front end of the guide hole from front to back, and the resetting pressure spring is in a natural extension state in a locking state. The cooperation of guide part and direction recess plays the guide effect to the back and forth activity of locking position handle, and guide part person of facilitating the use places the inside with the hand simultaneously and stimulates the operation forward, and spacing baffle's setting plays about and around with spacing effect to the installation of spring bolt, and canceling release mechanical system is reset spring, simple structure, and it is stable to reset.

The lower terminal surface interval of lock position handle portion be provided with two vertical guide posts, the base on be provided with the guide post position correspond and the guide way that link up from top to bottom, the guide post can stretch into the setting around movably in the guide way in, just the bottom face of guide post be provided with the internal thread hole, the internal thread downthehole spiro union install a screw, the head external diameter of screw be greater than the width of guide way. The cooperation through guide post and guide way makes the front and back activity of locking handle obtain further guide effect, and the cooperation of guide post and screw will lock the handle portion of keeping in the palm on installing on the base in addition, simple structure, easy dismounting.

The specific process of 360-degree steering adjustment of the chair back is as follows: when the child safety seat needs to be reversely installed, the handle part of the locking handle is pulled forwards to enable the locking lug to be separated from the locking groove of 0 degrees, the reset pressure spring is in a stretching state, then the seat back is rotated, the rotary disc and the installation rotary disc are driven by the seat back to rotate, the locking groove of 180 degrees is opposite to the locking handle, then the pulling force applied to the locking handle is removed, the reset pressure spring retracts and resets to drive the locking handle to move backwards, the locking lug enters the locking groove of 180 degrees, and the position of the seat back is fixed; the rotation angles of 90 ° and 270 ° are the same as above, and the two angles are set so that the seat back can be rotated to 90 ° or 270 ° to make the seat back directly face the left door or the right door of the rear seat of the automobile, and then the child can be mounted on the seat and then rotated to 0 ° or 180 ° in order to mount the child on the seat.

The angle adjusting block comprises two adjusting arms which are arranged in parallel and at intervals, the front ends of the two adjusting arms are connected through a connecting plate which is transversely arranged, the rear ends of the two adjusting arms are connected through a connecting shaft which is transversely arranged, the connecting shaft is fixedly connected with the adjusting arms, the connecting shaft can be rotatably arranged at the bottom of the chair back, the lower end surface of each adjusting arm is provided with one locking block, and the turntable is provided with a plurality of locking grooves corresponding to the front and back sliding directions of each locking block;

The adjusting handle comprises a handle part and an adjusting part, the handle part is arranged at the front end of the adjusting part, the rear end of the adjusting part is arranged above the angle adjusting block, two sides of the adjusting part are respectively provided with a transverse guide pillar, two adjusting arms are provided with adjusting guide grooves which are communicated from left to right, the adjusting guide grooves comprise an oblique guide section and a horizontal guide section which are sequentially arranged from front to back, the front end position of the oblique guide section is lower than the rear end position of the oblique guide section, the two guide pillars respectively and slidably extend into the adjusting guide grooves arranged at corresponding positions, and the lower end of the adjusting part is provided with a locking pressing block in a downward protruding manner;

in a locked state, the locking press block is placed on the connecting plate, the guide post is positioned in the horizontal guide section, the locking block is arranged in one of the locking grooves, when the angle of the chair back needs to be adjusted, the handle part of the adjusting handle is pulled forwards to separate the locking press block from the connecting plate, an upward raised space is provided for the front end of the adjusting arm, the guide post enters the oblique guide section, the front end of the adjusting arm is raised upwards by taking the connecting shaft as a fulcrum to separate the locking block from one of the locking grooves, the chair back slides forwards and backwards, after the adjusting arm is adjusted to a proper position, the adjusting handle is controlled to move backwards to enable the guide post to return to the horizontal guide section, the front end of the adjusting arm is pressed down to enable the locking block to enter the locking groove at a corresponding position again, the locking pressing block is placed on the connecting plate to realize the pressing and fixing of the front end of the angle adjusting block.

The upper end face of the connecting plate is provided with a locking recess which is recessed downwards, and the locking pressing block is arranged in the locking recess in a locking state. Through the sunken setting of lock position, shelve the installation for lock position briquetting and provide a stable spacing to ensure that the regulation handle can compress tightly angle adjustment piece fixedly steadily.

The adjusting part with the connecting plate between be provided with the extension spring, the lower extreme face downward bulge of adjusting part be provided with an installation piece, the fixed setting of one end of extension spring be in the rear end face of installation piece, the other end fixed setting of extension spring be in the preceding terminal surface of connecting plate, under the lock state, the extension spring be the natural state of stretching. The quick reset of the adjusting handle after the adjustment is finished is realized through the reset mechanism, so that the time and the labor are saved; the reset mechanism is a tension spring, and has simple structure and low cost.

compared with the prior art, the utility model has the advantages of: when the lower end of the limiting rod is positioned in the linear limiting section, the chair back can not rotate relative to the base due to the limiting function, the chair back is in a forward installation state, the angle can be adjusted at will without being influenced when the chair back is in the forward installation state, when the lower end of the limiting rod is positioned at the last end position of the linear limiting section, the locking block is positioned in the locking groove at the last end, the chair back angle is an angle which is approximately vertical to sit, when the lower end of the limiting rod is separated from the linear limiting section and enters the circular guide section, the locking block is positioned in the locking groove at the front end, the chair back angle is an angle which is approximately flat and is suitable for 0-15 months babies to use, the chair back angle is suitable for reverse installation, only after the chair back angle position is locked, the rotating disc is rotated to a reverse installation position, and when the reverse installation position is locked, due to the matching effect of the limiting rod and the circular guide section, the angle of the chair back can not be adjusted, namely the optimum use angle is achieved, the trouble that the angle of the chair back needs to be adjusted repeatedly after reverse installation is avoided, and the chair back adjusting device is simple in structure, convenient to operate, time-saving and labor-saving.

Drawings

Fig. 1 is a first schematic sectional view of the present invention;

FIG. 2 is a schematic structural view of the chair back of the present invention with the chair removed;

FIG. 3 is a schematic view of the position of the seat back of the chair in the upright position with the forward mounting of the present invention;

FIG. 4 is a schematic view of the position of the seat back of the chair in the forward direction when the seat back of the chair is inclined to a certain angle;

FIG. 5 is a schematic view of the fitting position between the seat back and the base when the limiting rod is separated from the linear limiting section and enters the circular guiding section when the seat back is installed in the forward direction;

FIG. 6 is a schematic view of the position of the seat back of the chair in the reverse orientation of the present invention;

fig. 7 is a schematic cross-sectional view of the turntable of the present invention in a locked state;

fig. 8 is a schematic sectional view of the turntable of the present invention in an unlocked state;

Fig. 9 is a schematic perspective view of the turntable of the present invention;

FIG. 10 is a bottom view of the present invention showing the locking tab mounted to the base;

fig. 11 is a schematic cross-sectional view of the chair back in the locked state according to the present invention;

FIG. 12 is an enlarged view of the structure of FIG. 11 at G;

FIG. 13 is a schematic structural view of the present invention in which an angle adjusting block is installed in cooperation with an adjusting handle;

Fig. 14 is a schematic cross-sectional view of the adjustment handle in a released state according to the present invention;

FIG. 15 is an enlarged schematic view of FIG. 14 at H;

Fig. 16 is a schematic structural diagram of the angle adjusting block of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

As shown in fig. 1 to 16, a child safety seat for a vehicle comprises a base 1 and a seat back 2 disposed on the base 1, wherein a rotating cavity 11 is disposed on the base 1, a rotating disc 3 is rotatably disposed in the rotating cavity 11, and the seat back 2 is slidably disposed on the rotating disc 3 back and forth and can rotate relative to the base 1 along with the rotating disc 3;

A chair back angle adjusting mechanism is arranged between the chair back 2 and the turntable 3, the chair back angle adjusting mechanism comprises an angle adjusting block A3 capable of being lifted up and down, the bottom of the angle adjusting block A3 is provided with a locking block A301, the turntable 3 is provided with a plurality of locking grooves 101 matched with the locking block A301 along the front-back sliding direction of the chair back 2, and an adjusting handle A4 for lifting the angle adjusting block A3 up and down is arranged on the angle adjusting block A3;

the limiting rod 4 is arranged on the chair back 2 in a penetrating manner from top to bottom, the limiting guide groove 111 is arranged in the rotating cavity 11, the guide sliding groove 31 is arranged on the rotary table 3 along the front-back sliding direction of the chair back 2, the lower end of the limiting rod 4 penetrates through the guide sliding groove 31 and can be arranged in the limiting guide groove 111 in a sliding manner, the limiting guide groove 111 comprises a circular guide section 1111 and a linear limiting section 1112, the circular guide section 1111 is coaxial with the rotary table 3 and divides the rotating cavity 11 into a rotating outer ring 112 and a rotating inner ring 113, the linear limiting section 1112 is arranged on the rotating inner ring 113 and is arranged from front to back along the front-back sliding direction of the chair back 2, the front end of the linear limiting section 1112 is communicated with the circular guide section 1111, and the rear end;

when the lower end of the limit rod 4 is located at the rearmost end of the linear limit section 1112 and located in the circular guide section 1111, the two limit positions are the angle adjustment positions of the chair back 2.

in this embodiment, there are two linear position-limiting segments 1112, two linear position-limiting segments 1112 are arranged in parallel at an interval, the limiting rod 4 includes two vertical position-limiting portions 41 arranged in parallel at an interval, the upper ends of the two position-limiting portions 41 are connected by a connecting portion 42 arranged in a transverse direction, two guide sliding grooves 31 arranged in parallel at an interval and matched with the two linear position-limiting segments 1112 are arranged on the turntable 3, and the lower end of each position-limiting portion 41 passes through the guide sliding groove 31 at the corresponding position and is arranged in the linear position-limiting segment 1112 at the corresponding position.

In this embodiment, a coaxial mounting post 310 is protruded downward from the bottom of the turntable 3, a through-going mounting hole 114 is disposed in the rotating cavity 11 and is matched with the mounting post 310, the mounting post 310 is rotatably inserted into the mounting hole 114, and the lower portion of the mounting post 310 is protruded out of the mounting hole 114 and is coaxially and fixedly connected with a mounting turntable 5, and the outer diameter of the mounting turntable 5 is larger than the inner diameter of the mounting hole 114.

In this embodiment, the lower end surface of the mounting post 310 is provided with a mounting slot 311, the upper end surface of the mounting rotary disk 5 is provided with a mounting projection 51 matched with the mounting slot 311, and the mounting projection 51 is inserted into the mounting slot 311.

In this embodiment, a locking mechanism for locking the position of the turntable 3 is arranged between the base 1 and the turntable 3; four locking grooves B23 are uniformly distributed on the side of the turntable 3 along the circumference, and the four locking grooves B23 respectively and correspondingly enable the chair back 2 to be at the positions of 0 degree, 90 degrees, 180 degrees and 270 degrees; the locking mechanism comprises a locking handle B3, a locking lug B4 matched with the locking groove B23 is arranged on the locking handle B3, the locking handle B3 can be arranged on the base 1 in a back-and-forth pulling mode, a reset mechanism enabling the locking handle B3 to reset is arranged between the locking handle B3 and the base 1, in the locking state, the locking lug B4 is arranged in one locking groove B23, when the locking handle B3 is pulled forwards to enable the locking lug B4 to be separated from the locking groove B23 when rotation is needed, after rotation adjustment is completed, pulling force applied to the locking handle B3 is removed, and the locking handle B3 is reset under the driving of the reset mechanism to enable the locking lug B4 to be clamped into the locking groove B23 to lock the position of the upper rotary disc 3.

In this embodiment, the locking handle B3 includes a locking handle B31, the upper end of the locking handle B31 is recessed downward to form a hollow guide B311 protruding downward, the base 1 is provided with a guide groove B12, the guide B311 is movably disposed in the guide groove B12 forward and backward, the rear end of the locking handle B31 is connected with a lock tongue B32, the upper end of the lock tongue B32 is protruding upward to form a locking lug B4, the rear end of the lock tongue B32 is bent downward to form a vertical first bending portion B321, the rear end of the first bending portion B321 is bent backward to form a horizontal second bending portion B322, the base 1 is provided with a guide hole B13 penetrating up and down, the guide hole B13 is located behind the guide groove B12, the upper portion of the inner side wall of the rear end of the guide hole B13 extends forward to form a position-limiting baffle B131, the second bending portion B322 is located below the position-limiting baffle B131, the first bending portion B321 is located at the front end of the position-limiting baffle B131, the reset mechanism is a reset pressure spring B5, the reset pressure spring B5 is transversely arranged between the inner side wall of the second bending part B322 and the inner side wall of the front end of the guide hole B13 from front to back, and in a locked state, the reset pressure spring B5 is in a natural extension state.

in this embodiment, two vertical guide posts B312 are disposed at an interval on the lower end surface of the locking handle B31, a guide groove B14 corresponding to the guide posts B312 and penetrating up and down is disposed on the base 1, the guide posts B312 can be movably inserted into the guide groove B14 back and forth, an internal threaded hole (not shown) is disposed on the bottom end surface of the guide posts B312, a screw (not shown) is screwed into the internal threaded hole, and the outer diameter of the head of the screw is larger than the width of the guide groove B14.

in this embodiment, the angle adjusting block A3 includes two adjusting arms a31 arranged side by side and at intervals, the front ends of the two adjusting arms a31 are connected by a transversely arranged connecting plate a32, the rear ends of the two adjusting arms a31 are connected by a transversely arranged connecting shaft a33, the connecting shaft a33 is fixedly connected with the adjusting arms a31, the connecting shaft a33 is rotatably arranged at the bottom of the chair back 2, the lower end surface of each adjusting arm a31 is provided with a locking block a301, and the rotary plate 3 is provided with a plurality of locking grooves 101 corresponding to the front and rear sliding directions of each locking block a 301;

the adjusting handle A4 comprises a handle part A41 and an adjusting part A42, the handle part A41 is arranged at the front end of the adjusting part A42, the rear end of the adjusting part A42 is arranged above an angle adjusting block A3, two sides of the adjusting part A42 are respectively provided with a transverse guide pillar A43, two adjusting arms A31 are provided with an adjusting guide groove A311 which is through from left to right, the adjusting guide groove A311 comprises an oblique guide section A3111 and a horizontal guide section A3112 which are sequentially arranged from front to back, the front end position of the oblique guide section A3111 is lower than the rear end position of the oblique guide section 3111, the two guide pillars A43 respectively extend into the adjusting guide groove A311 arranged at corresponding positions in a sliding manner, and the lower end of the adjusting part A42 is provided with a locking pressing block A421 in a downward protruding manner;

In the locked state, the locking pressing block A421 is placed on the connecting plate A32, the guide post A43 is positioned on the horizontal guide section A3112, the locking block A301 is arranged in one of the locking grooves 101, when the angle of the chair back 2 needs to be adjusted, the handle part A41 of the adjusting handle A4 is pulled forwards, the locking press block A421 is separated from the connecting plate A32, a space which is lifted upwards is provided for the front end of the adjusting arm A31, the guide post A43 enters the inclined guide section A3111, the front end of the adjusting arm A31 is lifted upwards by taking the connecting shaft 33 as a fulcrum, the locking block A301 is separated from one locking groove 101, the chair back 2 slides forwards and backwards, and after the adjusting is in place, the adjustment handle A4 is controlled to move backwards, the guide post A43 returns to the horizontal guide section A3112, the front end of the adjustment arm A31 is pressed down, the locking block A301 enters the locking groove 101 at the corresponding position again, the locking pressing block A421 is placed on the connecting plate A32 to realize the pressing and fixing of the front end of the angle adjusting block 3.

in this embodiment, the upper end surface of the connecting plate a32 is provided with a locking recess a321 which is recessed downwards, and in the locking state, the locking pressing block a421 is arranged in the locking recess a 321.

In this embodiment, a reset mechanism for quickly resetting the adjustment handle A4 is disposed between the adjustment portion a42 and the connection plate a32, the reset mechanism is a tension spring a5 disposed along the forward and backward sliding direction of the chair back 2, a mounting block a422 is disposed on the lower end surface of the adjustment portion a42 in a downward protruding manner, one end of the tension spring a5 is fixedly disposed on the rear end surface of the mounting block a422, the other end of the tension spring a5 is fixedly disposed on the front end surface of the connection plate a32, and in the locked state, the tension spring a5 is in a natural extension state.

Claims (10)

1. a child safety seat for a vehicle comprises a base and a seat back arranged on the base, and is characterized in that a rotating cavity is arranged on the base, a rotating disc is rotatably arranged in the rotating cavity, and the seat back can be arranged on the rotating disc in a sliding manner back and forth and can rotate relative to the base along with the rotating disc;

A chair back angle adjusting mechanism is arranged between the chair back and the turntable and comprises an angle adjusting block capable of being lifted up and down, a locking block is arranged at the bottom of the angle adjusting block, a plurality of locking grooves matched with the locking block are formed in the turntable along the front-back sliding direction of the chair back, and an adjusting handle for lifting the angle adjusting block up and down is arranged on the angle adjusting block;

the seat back is provided with a limiting rod in a penetrating manner from top to bottom, a limiting guide groove is arranged in the rotating cavity, a guide sliding groove is arranged on the turntable along the front-back sliding direction of the seat back, the lower end of the limiting rod penetrates through the guide sliding groove and can be arranged in the limiting guide groove in a sliding manner, the limiting guide groove comprises a circular guide section and a linear limiting section, the circular guide section is coaxial with the turntable and divides the rotating cavity into a rotating outer ring and a rotating inner ring, the linear limiting section is arranged on the rotating inner ring and is arranged from front to back along the front-back sliding direction of the seat back, the front end of the linear limiting section is communicated with the circular guide section, and the rear end of the linear limiting section is positioned in front of the central axis of the turntable;

When the lower end of the limiting rod is positioned at the last end of the linear limiting section and in the circular guide section, the lower end of the limiting rod is respectively positioned at two limit positions for angle adjustment of the chair back.

2. a child safety seat according to claim 1, wherein the number of the linear limiting segments is two, the two linear limiting segments are arranged in parallel at intervals, the limiting rod includes two vertically-parallel limiting portions arranged at intervals, the upper ends of the two limiting portions are connected by a connecting portion arranged in a transverse direction, the turntable is provided with two parallel guide sliding grooves arranged at intervals and matched with the two linear limiting segments, and the lower end of each limiting portion penetrates through the guide sliding groove at the corresponding position and is arranged in the linear limiting segment at the corresponding position.

3. A child safety seat for vehicle use as claimed in claim 1, wherein the bottom of the rotary plate is provided with a coaxial mounting post protruding downward, the rotary cavity is provided with a vertically through mounting hole matching with the mounting post, the mounting post is rotatably inserted into the mounting hole, the lower portion of the mounting post extends out of the mounting hole and is coaxially and fixedly connected with a mounting rotary plate, and the outer diameter of the mounting rotary plate is larger than the inner diameter of the mounting hole.

4. A child safety seat for vehicle use according to claim 3, wherein the lower end surface of the mounting post is provided with a mounting slot, the upper end surface of the mounting turntable is provided with a mounting protrusion matching with the mounting slot, and the mounting protrusion is inserted into the mounting slot.

5. A child safety seat for vehicle use according to claim 3, wherein a locking mechanism for locking the position of said turntable is provided between said base and said turntable; four locking grooves are uniformly distributed on the side part of the rotary table along the circumference, and the four locking grooves respectively and correspondingly enable the chair back to be at the positions of 0 degree, 90 degrees, 180 degrees and 270 degrees; the locking mechanism comprises a locking handle, a locking lug matched with the locking groove is arranged on the locking handle, the locking handle can be arranged on the base in a front-back pulling mode, a reset mechanism enabling the locking handle to reset is arranged between the locking handle and the base, the locking lug is arranged in one of the locking grooves in a locking state, when the locking handle needs to rotate, the locking handle is pulled forwards, the locking lug is made to break away from the locking groove, after the rotation adjustment is completed, the pulling force applied to the locking handle is removed, and the locking handle is driven by the reset mechanism to reset so that the locking lug is clamped into the locking groove to lock the position of the turntable.

6. the child safety seat for vehicle according to claim 5, wherein the locking handle includes a locking handle portion, the upper end of the locking handle portion is recessed downward to form a hollow guide portion protruding downward, the base is provided with a guide groove, the guide portion is movably disposed in the guide groove forward and backward, the rear end of the locking handle portion is connected with a latch, the upper end of the latch is protruded upward to form the locking protrusion, the rear end of the latch is bent downward to form a vertical first bending portion, the rear end of the first bending portion is bent backward to form a horizontal second bending portion, the base is provided with a guide hole penetrating up and down, the guide hole is located behind the guide groove, the upper portion of the inner side wall of the rear end of the guide hole extends forward to form a limit baffle, the second bending part is arranged below the limiting baffle, the first bending part is positioned at the front end of the limiting baffle, the resetting mechanism is a resetting pressure spring, the resetting pressure spring is transversely arranged between the inner side wall of the second bending part and the inner side wall of the front end of the guide hole from front to back, and the resetting pressure spring is in a natural extension state in a locking state.

7. The child safety seat for vehicle according to claim 6, wherein the lower end surface of the lock handle portion is provided with two vertical guide posts at intervals, the base is provided with a guide groove corresponding to the position of the guide posts and penetrating up and down, the guide posts can be movably inserted into the guide groove back and forth, the bottom end surface of the guide posts is provided with an internal threaded hole, a screw is screwed in the internal threaded hole, and the outer diameter of the head of the screw is larger than the width of the guide groove.

8. the child safety seat for vehicle according to claim 1, wherein the angle adjustment block comprises two adjustment arms arranged side by side and at an interval, the front ends of the two adjustment arms are connected through a transversely arranged connecting plate, the rear ends of the two adjustment arms are connected through a transversely arranged connecting shaft, the connecting shaft is fixedly connected with the adjustment arms, the connecting shaft is rotatably arranged at the bottom of the seat back, the lower end surface of each adjustment arm is provided with one locking block, and the rotary plate is provided with a plurality of locking grooves corresponding to the front and rear sliding directions of each locking block;

the adjusting handle comprises a handle part and an adjusting part, the handle part is arranged at the front end of the adjusting part, the rear end of the adjusting part is arranged above the angle adjusting block, two sides of the adjusting part are respectively provided with a transverse guide pillar, two adjusting arms are provided with adjusting guide grooves which are communicated from left to right, the adjusting guide grooves comprise an oblique guide section and a horizontal guide section which are sequentially arranged from front to back, the front end position of the oblique guide section is lower than the rear end position of the oblique guide section, the two guide pillars respectively and slidably extend into the adjusting guide grooves arranged at corresponding positions, and the lower end of the adjusting part is provided with a locking pressing block in a downward protruding manner;

in a locked state, the locking press block is placed on the connecting plate, the guide post is positioned in the horizontal guide section, the locking block is arranged in one of the locking grooves, when the angle of the chair back needs to be adjusted, the handle part of the adjusting handle is pulled forwards to separate the locking press block from the connecting plate, an upward raised space is provided for the front end of the adjusting arm, the guide post enters the oblique guide section, the front end of the adjusting arm is raised upwards by taking the connecting shaft as a fulcrum to separate the locking block from one of the locking grooves, the chair back slides forwards and backwards, after the adjusting arm is adjusted to a proper position, the adjusting handle is controlled to move backwards to enable the guide post to return to the horizontal guide section, the front end of the adjusting arm is pressed down to enable the locking block to enter the locking groove at a corresponding position again, the locking pressing block is placed on the connecting plate to realize the pressing and fixing of the front end of the angle adjusting block.

9. a child safety seat for vehicle use according to claim 8, wherein the upper end surface of the connecting plate is provided with a locking recess recessed downward, and the locking pressing piece is disposed in the locking recess in the locked state.

10. The child safety seat according to claim 8, wherein a tension spring is disposed between the adjusting portion and the connecting plate, a mounting block is disposed on a lower end surface of the adjusting portion in a downward protruding manner, one end of the tension spring is fixedly disposed on a rear end surface of the mounting block, the other end of the tension spring is fixedly disposed on a front end surface of the connecting plate, and the tension spring is in a natural extension state in the locked state.