CN114652133A - An adjustable toddler chair - Google Patents

Abstract

The application discloses an adjustable infant chair, which belongs to the field of children furniture and comprises a chair seat, supporting legs arranged on the chair seat and a chair back arranged on the chair seat, a tray for holding bowls and dishes is arranged on the chair back, an adjusting component is arranged on the supporting leg, the adjusting component comprises a positioning rod which is arranged in the supporting leg in a penetrating way, a positioning block which is fixedly sleeved on the positioning rod, a first spring which is fixed at one end of the positioning block and a steel wire which is fixed at the other end of the positioning block, the two ends of the positioning rod are provided with rollers, the supporting leg is provided with a positioning groove which is matched with the positioning block in a sliding way, the end part of the first spring, which is far away from the positioning block, is fixedly connected with the inner bottom surface of the positioning groove, and the chair seat is provided with a control assembly for pulling the steel wire. The baby chair has the effect of preventing the baby chair from deviating during dining.

Description

An adjustable toddler chair

technical field

The present application relates to the field of children's furniture, in particular to an adjustable toddler chair.

Background technique

Children's chairs are commonly used. Compared with ordinary chairs, children's chairs are more in line with children's usage habits, and children's chairs have anti-slip functions, are resistant to dirt and are easy to clean. Because children lack self-control, in order to ensure the safety of children, adults generally Special toddler chairs will be purchased for children.

In the related art, the Chinese invention patent application with publication number CN1985716A discloses a high chair for infants, including a support frame, including front legs and rear legs; a seat, including a backrest, a seat surface and an armrest, wherein the seat is connected to The support frame is supported by the support frame; the tray is detachably connected to the seat, and the bottom of the support frame is provided with rollers.

In view of the above-mentioned related art, the inventor believes that although the rollers installed at the bottom of the toddler chair can facilitate people to move the toddler chair, when an adult is feeding the child on the toddler chair, the toddler chair may shift with the shaking of the child, so the adult The position of the toddler chair needs to be adjusted continuously, and the toddler chair is inconvenient to use.

SUMMARY OF THE INVENTION

In order to prevent the child chair from shifting when the child eats, the present application provides an adjustable child chair.

An adjustable toddler chair provided by the application adopts the following technical solutions:

An adjustable toddler chair, comprising a chair seat, support legs installed on the chair seat, and a chair back installed on the chair seat, the chair back is provided with a tray for holding dishes, the An adjustment assembly is arranged on the support leg, and the adjustment assembly includes a positioning rod passing through the support leg, a positioning block fixedly sleeved on the positioning rod, a first spring fixed at one end of the positioning block, and The steel wire fixed on the other end of the positioning block, the two ends of the positioning rod are installed with rollers, the support leg is provided with a positioning groove for sliding cooperation with the positioning block, and the first spring is far away from the The end of the positioning block is fixedly connected with the inner bottom surface of the positioning groove, and a control assembly for pulling the steel wire is installed on the chair seat.

By adopting the above technical solution, the setting of the roller is convenient for the operator to move the baby chair. When the adult uses the tray to feed the baby, the operator uses the control assembly to pull the wire, the wire moves the positioning block, and the positioning block moves the positioning rod. , the positioning rod moves to make the roller rise, so that the roller is out of contact with the bottom surface, and the bottom of the support leg is in contact with the bottom surface, thereby improving the stability of the child chair and preventing the child chair from shifting during adult feeding.

Preferably, an installation cavity is opened in the chair seat, and the control assembly includes a bidirectional screw rod rotatably installed on the inner side wall of the installation cavity, and connecting blocks arranged at both ends of the bidirectional screw rod. The block is threaded with the two-way screw, and the end of the steel wire away from the positioning block penetrates into the installation cavity and is fixedly connected with the adjacent connection block, and the connection block is connected to the installation cavity. The inner bottom surface of the cavity is rotatably connected, a first worm wheel is fixedly sleeved on the bidirectional screw rod, a first worm screw for meshing with the first worm wheel is passed through the chair seat, and a first worm screw is arranged on the first worm screw. handwheel.

By adopting the above technical solution, the operator rotates the handwheel, the rotation of the handwheel makes the first worm rotate, the rotation of the first worm makes the first worm wheel rotate, the rotation of the first worm wheel makes the bidirectional screw rotate, and the rotation of the double lower screw makes the two connections The blocks approach or move away from each other, and the movement of the connecting block drives the wire to move, thereby facilitating the operator to control the height of the positioning rod and the roller.

Preferably, the support leg includes a fixed segment provided on the chair seat and a moving segment inserted in the fixed segment, the moving segment is slidingly matched with the fixed segment, and the fixed segment is threaded on the upper A positioning pin is provided, and the moving section is provided with a plurality of positioning holes along its own length direction for the insertion and matching of the positioning pins.

By adopting the above technical solution, the fixed section and the moving section are arranged to facilitate the operator to control the height of the support legs, thereby facilitating the operator to adjust the height of the toddler chair, and the coordination of the positioning pins and the positioning holes facilitates the operator to fix the moving section, thereby preventing the moving section Relative movement to and from the fixed segment.

Preferably, one end of the chair base is provided with a first rotating rod, the other end of the chair base is rotatably installed with a second rotating rod, and the supporting legs are divided into front legs installed at both ends of the first rotating rod and a mounting rod. At the rear legs at both ends of the second rotating rod, the chair seat is provided with driving components for driving the first rotating rod and the second rotating rod to rotate.

By adopting the above technical solution, when the operator needs to store the baby chair, the operator uses the drive assembly to rotate the first rotating rod and the second rotating rod, the rotation of the first rotating rod causes the front legs to be folded, and the rotation of the second rotating rod makes the The folding of the rear legs and the folding of the support legs are beneficial to reduce the space occupied by the toddler chair, thereby facilitating the operator to store it.

Preferably, the drive assembly includes a drive rod passing through the chair seat, a second worm screw rotatably mounted on the inner side wall of the installation cavity, and two second worm screws for engaging with the second worm screw. Two worm gears, the driving rod is fixedly sleeved with a driving gear, the second rotating rod is fixedly sleeved with a driven gear for meshing with the driving gear, and one of the second worm gears is fixedly sleeved on the On the first rotating rod, the other second worm gear is fixedly sleeved on the driving rod, and a power assembly for driving the second worm to rotate is provided on the chair seat.

By adopting the above technical solution, the operator starts the power assembly, the power assembly makes the second worm rotate, the second worm rotates to make the second worm wheel rotate, the second worm wheel rotates to make the first rotating rod and the drive rod rotate, and the drive rod rotates to make the driving gear rotate Rotation, the rotation of the driving gear makes the driven gear rotate, and the rotation of the driven gear makes the second rotating rod rotate.

Preferably, a power cavity is opened in the back of the chair, and the power assembly includes a plug rod slidably penetrated in the back of the chair, a first gear rotatably installed on the inner side wall of the power cavity, a Two gears and a rack that slides through the back of the chair, the first gear and the second gear are meshed with each other, a clip is fixedly connected to the plug-in rod, and the inner side wall of the first gear is A card slot is provided for sliding cooperation with the clip, the second worm is provided with a slot for accommodating the insertion rod and the clip, the rack and the driving gear are meshed with each other, and A pull rod is fixedly connected to the rack.

By adopting the above technical solution, the operator first pulls the plug-in rod outward, and when the operator turns the chair back to abut against the chair seat, the operator inserts the plug-in rod into the second worm, and then the operator pulls the pull rod, the pull rod The movement makes the rack move, the rack movement makes the second gear rotate, the second gear rotates, the first gear rotates, the first gear rotates through the cooperation between the clip and the slot, and the insertion rod rotates through the clip and the slot. The cooperation of the grooves drives the second worm to rotate, and finally makes the first rotating rod and the second rotating rod rotate.

Preferably, a fixing ring is sleeved on the plug rod, a second spring is sleeved on the plug rod, one end of the second spring is fixedly connected with the fixing ring, and the other end of the second spring is fixedly connected fixedly connected with the first gear.

By adopting the above technical solution, the arrangement of the second spring is beneficial to reset the plug-in rod. When the operator pulls the plug-in rod, the plug-in rod moves and drives the fixed ring to move. At this time, the second spring is in a stretched state. When the insertion rod is opened, the fixing ring moves under the elastic force of the second spring, and the movement of the fixing ring drives the insertion rod to be inserted into the slot. In addition, the arrangement of the second spring is beneficial to prevent the insertion rod from being separated from the chair back.

Preferably, side panels are fixedly connected to both sides of the chair seat, a guard rail is provided on the chair back, the guard rail is rotatably connected to the chair back, and the guard rail is in contact with the side panel.

By adopting the above technical solution, the side panels and the guard rails are arranged to help prevent children from slipping off the toddler chair, and the side panels are helpful to support the guard rails, thereby determining the position of the guard rails.

Preferably, a fixing frame is rotatably installed on the back of the chair, the fixing frame is fixedly connected with the tray, and the bottom of the tray is provided with an accommodating groove for engaging with the guardrail.

By adopting the above technical solution, the setting of the fixing frame is convenient for the operator to turn over the tray. When the operator needs to use the tray, the operator rotates the fixing frame until the tray is locked with the guardrail. stability.

To sum up, the present application includes at least one of the following beneficial technical effects:

1. The setting of the roller is convenient for the operator to move the child chair. When the adult uses the tray to feed the child, the operator uses the control component to pull the wire, and the movement of the wire drives the positioning block to move, and the movement of the positioning block causes the positioning rod to move, and the positioning rod to move. Make the roller rise, and then make the roller out of contact with the bottom surface, and the bottom of the support leg is in contact with the bottom surface, thereby improving the stability of the child chair and preventing the child chair from shifting during the feeding process of adults;

2. The operator uses the drive assembly to rotate the first rotating rod and the second rotating rod. The rotation of the first rotating rod makes the front legs fold, the second rotating rod rotates to fold the rear legs, and the folding of the support legs helps reduce the space occupied by the child chair , so as to facilitate the operator to store;

3. The setting of the side panel and the guardrail is beneficial to prevent the child from slipping off the toddler chair, and the setting of the side panel is helpful for supporting the guardrail, thereby determining the position of the guardrail, and the setting of the guardrail is helpful for supporting the tray, thereby improving the safety of the tray. stability.

Description of drawings

FIG. 1 is a schematic structural diagram of a toddler chair according to an embodiment of the present application.

FIG. 2 is a schematic structural diagram of an adjustment assembly according to an embodiment of the present application.

FIG. 3 is a schematic diagram of the internal structure of the chair seat according to the embodiment of the present application.

FIG. 4 is a schematic diagram of the internal structure of the chair back according to the embodiment of the present application.

FIG. 5 is an enlarged schematic view of A in FIG. 4 .

Description of reference numbers:

1. Chair seat; 11. Side plate; 111. Positioning bolt; 12. First rotating rod; 13. Fixing plate; 14. Second rotating rod; 141. Connection box; 142. Driven gear; 15. Installation cavity ; 16, the first worm gear; 17, the first worm; 171, the hand wheel; 2, the support leg; 21, the fixed section; 211, the positioning pin; 22, the moving section; 221, the positioning hole; 23, the installation rod; Positioning groove; 232, abutting block; 24, front leg; 25, rear leg; 3, adjusting assembly; 31, positioning rod; 311, roller; 32, positioning block; 33, first spring; 34, steel wire; 4 , control assembly; 41, two-way screw; 42, connecting block; 5, drive assembly; 51, drive rod; 511, driving gear; 52, second worm; 521, slot; 53, second worm gear; 6, chair Back; 61, power cavity; 62, guard rail; 63, fixing frame; 64, tray; 641, accommodating slot; 7, power assembly; 71, plugging rod; 711, disc; 712, clip; 713, 714, the second spring; 72, the first gear; 721, the card slot; 73, the second gear; 74, the rack; 741, the pull rod.

Detailed ways

The present application will be further described in detail below in conjunction with accompanying drawings 1-5.

The embodiment of the present application discloses an adjustable toddler chair. Referring to FIG. 1 , the toddler chair includes a seat 1 and support legs 2 .

1 and 2 , the chair base 1 is arranged horizontally, the cross section of the chair base 1 is rectangular, and side plates 11 are fixedly connected to both sides of the chair base 1 . The support leg 2 includes a fixed section 21 and a moving section 22 penetrated in the fixed section 21 . The end of the fixed section 21 away from the moving section 22 is disposed on the chair base 1 , and the fixed section 21 and the moving section 22 are slidingly matched. The end of the fixed section 21 close to the moving section 22 is provided with a positioning pin 211 , and the moving section 22 is provided with a plurality of positioning holes 221 for inserting and matching with the positioning pins 211 . Evenly arranged in the length direction. The end of the moving section 22 away from the fixed section 21 is provided with a mounting rod 23, the length direction of the mounting rod 23 is consistent with the length direction of the moving section 22, the upper end of the mounting rod 23 is rotatably connected with the moving section 22, and the bottom of the mounting rod 23 is fixedly connected There is abutment block 232 .

Referring to FIGS. 1 and 2 , there are four supporting legs 2 , and each supporting leg 2 is provided with an adjusting assembly 3 . The adjusting assembly 3 includes a positioning rod 31 , a positioning block 32 , a first spring 33 and a steel wire 34 . The positioning block 32 passes through the mounting rod 23 , and the mounting rod 23 defines a positioning groove 231 . The positioning rod 31 is horizontally inserted into the positioning block 32 , the positioning rod 31 is rotatably connected with the positioning block 32 , and rollers 311 are installed on both ends of the positioning rod 31 . The first spring 33 is disposed at the bottom of the positioning block 32 , one end of the first spring 33 is fixedly connected to the positioning block 32 , and the other end of the first spring 33 is fixedly connected to the inner bottom surface of the positioning groove 231 . The wire 34 is disposed at the end of the positioning block 32 away from the first spring 33 , one end of the wire 34 is fixedly connected to the positioning block 32 , and the other end of the wire 34 passes through the mounting rod 23 , the moving section 22 and the fixed section 21 in sequence.

1 and 2 , the support legs 2 are divided into two front legs 24 arranged at one end of the chair seat 1 and two rear legs 25 arranged at the other end of the chair seat 1 . The end of the chair base 1 close to the front legs 24 is horizontally provided with a first rotating rod 12 , and the first rotating rod 12 is rotatably connected with the chair base 1 and the side plate 11 respectively. Both ends of the first rotating rod 12 are respectively fixedly connected with a front leg 24 , and the front leg 24 is slidingly matched with the side plate 11 . Two fixing plates 13 are installed on the bottom surface of the chair seat 1 near the rear legs 25 , the two fixing plates 13 are symmetrically arranged, and a second rotating rod 14 is rotatably installed between the two fixing plates 13 . Two ends of the second rotating rod 14 are respectively fixedly connected with a rear leg 25 , and the rear leg 25 is slidingly matched with the fixing plate 13 .

2 and 3 , the chair base 1 is provided with a control assembly 4, the control assembly 4 includes a bidirectional screw rod 41 and a connecting block 42, and an installation cavity 15 is opened in the chair base 1, and the cross section of the installation cavity 15 is rectangular. . One end of the two-way screw 41 is close to the front leg 24 , the other end of the two-way screw 41 is close to the rear leg 25 , and both ends of the two-way screw 41 are rotatably connected to the inner wall of the installation cavity 15 . There are two connecting blocks 42 , and the two connecting blocks 42 are respectively disposed on both ends of the two-way screw rod 41 , and the connecting blocks 42 are threadedly matched with the two-way screw rod 41 . The steel wire 34 located on the front leg 24 penetrates into the first rotating rod 12 from the fixed section 21. The steel wire 34 extends for a certain distance along the length direction of the first rotating rod 12 and then passes out of the first rotating rod 12 and connects with the adjacent connecting block. 42 fixed connections.

Referring to FIGS. 2 and 3 , the steel wire 34 on the rear leg 25 penetrates the second rotating rod 14 from the fixed section 21 , and passes through the fixing plate 13 and the inner bottom surface of the mounting cavity 15 from the second rotating rod 14 in sequence and is connected with the inner bottom surface of the mounting cavity 15 . Adjacent connection blocks 42 are fixedly connected. A first worm wheel 16 is sleeved in the middle of the bidirectional screw rod 41 , and the first worm wheel 16 is fixedly connected with the bidirectional screw rod 41 . The chair seat 1 is provided with a first worm 17, the first worm 17 is rotatably connected to the chair seat 1, and the end of the first worm 17 extending into the installation cavity 15 engages with the first worm wheel 16, and the first worm 17 is located in the seat. A hand wheel 171 is fixedly connected to the outer end of the chair seat 1 .

2 and 3, the operator rotates the handwheel 171, the rotation of the handwheel 171 makes the first worm 17 rotate, the first worm 17 rotates to drive the first worm wheel 16 to rotate, and the first worm wheel 16 rotates to make the bidirectional screw 41 rotate. The rotation of the screw 41 makes the two connecting blocks 42 approach or move away from each other. When the two connecting blocks 42 approach each other, the connecting blocks 42 drive the steel wire 34 to move, the steel wire 34 pulls the positioning block 32 to rise, and the positioning block 32 rises so that the positioning rod 31 and the roller 311 rise, thereby causing the abutting block 232 to abut the ground. When the two connecting blocks 42 are far away from each other, the steel wire 34 is loose, and the positioning block 32 moves downward under the elastic force of the first spring 33. The movement of the positioning block 32 drives the positioning rod 31 and the roller 311 to move, so that the roller 311 is in contact with the bottom surface, thereby facilitating people to move the infant chair.

Referring to FIGS. 2 and 3 , the chair seat 1 is provided with a first rotating rod 12 for driving and a driving assembly 5 for rotating the second rotating rod 14 . The driving assembly 5 includes a driving rod 51 , a second worm 52 and a second worm wheel 53 . The driving rod 51 is disposed at the end of the chair base 1 close to the second rotating rod 14 , the driving rod 51 is horizontally arranged, and the two ends of the driving rod 51 are rotatably connected to the inner wall of the installation cavity 15 respectively. A connection box 141 is sleeved on the second rotating rod 14 , the connection box 141 is fixedly connected with the bottom of the chair seat 1 , and the inner cavity of the connection box 141 is communicated with the installation cavity 15 . A driving gear 511 is fixedly sleeved on the driving rod 51 , a driven gear 142 is fixedly sleeved on the second rotating rod 14 , the driven gear 142 is arranged in the inner cavity of the connection box 141 , and the driving gear 511 and the driven gear 142 mesh with each other. There are two second worm gears 53 , one second worm gear 53 is fixedly sleeved on the first rotating rod 12 , and the other second worm gear 53 is fixedly sleeved on the driving rod 51 . The length direction of the second worm 52 is consistent with the length of the bidirectional screw 41 , the end of the second worm 52 is rotatably connected to the inner wall of the installation cavity 15 , and the second worm 52 meshes with the two second worm wheels 53 respectively.

1 , 4 and 5 , a chair back 6 is hinged to the end of the chair seat 1 close to the second rotating rod 14 , the chair back 6 can abut the chair seat 1 , and the chair back 6 is provided with a second worm for driving 52 Rotating power assembly 7. The power assembly 7 includes a plug-in rod 71 , a first gear 72 , a second gear 73 and a rack 74 . A power cavity 61 is opened in the chair back 6 , and the cross section of the power cavity 61 is rectangular. The plug-in rod 71 is penetrated on the side of the chair back 6 away from the chair seat 1, the plug-in rod 71 is slidingly matched with the chair back 6, and the end of the plug-in rod 71 outside the chair back 6 is fixedly connected with a disc 711 . The first gear 72 is disposed on the inner wall of the power cavity 61 away from the disk 711 , the first gear 72 is rotatably connected to the inner wall of the power cavity 61 , and is sleeved on the plug rod 71 . A clamping strip 712 is fixedly connected to the outer peripheral surface of the plug-in rod 71 along its own length direction, and a clamping slot 721 is formed on the inner side wall of the first gear 72 . A slot 521 for accommodating the plug-in rod 71 and the card slot 721 is opened on the end face close to the chair back 6 .

4 and 5 , a fixing ring 713 is fixedly sleeved on the plug-in rod 71 , a second spring 714 is arranged between the fixing ring 713 and the first gear 72 , and one end of the second spring 714 is fixedly connected with the fixing ring 713 . The other ends of the two springs 714 are fixedly connected with the first gear 72 . The second gear 73 is rotatably mounted on the inner side wall of the power cavity 61 , and the second gear 73 and the first gear 72 mesh with each other. The rack 74 is vertically penetrated in the chair back 6 , the rack 74 and the second gear 73 are engaged with each other, and the rack 74 is slidingly engaged with the inner side wall of the power cavity 61 . A pull rod 741 is fixedly connected to the upper end of the rack 74 , and one end of the pull rod 741 away from the rack 74 passes through the chair back 6 , and the pull rod 741 slides with the chair back 6 .

4 and 5, the operator first pulls the disc 711, the disc 711 drives the insertion rod 71 and the fixing ring 713 to move, at this time the second spring 714 is in a stretched state, and then the operator rotates the chair back 6 to the same When the chair seat 1 abuts and the operator releases the disc 711 , the fixing ring 713 moves under the action of the second spring 714 . The operator moves the pull rod 741, the pull rod 741 moves to drive the rack 74 to move, the rack 74 moves to make the second gear 73 rotate, the second gear 73 rotates to make the first gear 72 rotate, and the first gear 72 passes through the clip 712 and the clip slot 721. The matching makes the plugging rod 71 rotate, the plugging rod 71 rotates to make the second worm 52 rotate, the second worm 52 rotates to make the second worm wheel 53 rotate, so that the first rotating rod 12 and the driving rod 51 rotate, the first rotating rod The rotation of 12 makes the front leg 24 fold, the rotation of the driving rod 51 makes the driving gear 511 rotate, the rotation of the driving gear 511 makes the driven gear 142 rotate, the rotation of the driven gear 142 makes the second rotation rod 14 rotate, and the rotation of the second rotation rod 14 makes the rear Legs 25 folded.

1 and 4, the side plate 11 is provided with positioning bolts 111, the positioning bolts 111 penetrate into the chair back 6 and are threadedly matched with the chair back 6, and the setting of the positioning bolts 111 further fixes the chair back 6, thereby improving the baby chair. stability. A guard rail 62 is rotatably installed on the chair back 6 . There is a large frictional force between the guard rail 62 and the chair back 6 , and after the guard rail 62 is rotated at a certain angle, the guard rail 62 abuts against the side plate 11 . The provision of the guardrail 62 is beneficial to prevent children from falling, and the provision of the side plate 11 is beneficial to provide support for the guardrail 62 and prevent the guardrail 62 from rotating further.

1 and 4 , a fixing frame 63 is installed on the chair back 6, a tray 64 is fixedly connected to the fixing frame 63, the fixing frame 63 is rotatably connected with the chair back 6, and the inner side wall of the fixing frame 63 is connected with the outer side of the guardrail 62. Wall slip fit. An accommodating groove 641 is defined at the bottom of the tray 64 , and the end of the guard rail 62 close to the tray 64 is in contact with the inner side wall of the accommodating groove 641 . When the adult needs to feed the infant, the adult rotates the fixing frame 63 until the guard rail 62 is engaged with the accommodating groove 641 of the tray 64, and the guard rail 62 is beneficial to prevent the fixing frame 63 and the tray 64 from rotating further.

The implementation principle of an adjustable infant chair in the embodiment of the present application is that the setting of the roller 311 is convenient for the operator to move the infant chair. When an adult uses the tray 64 to feed the infant, the operator turns the hand wheel 171, and the rotation of the hand wheel 171 makes the first A worm 17 rotates, the first worm 17 rotates to drive the first worm wheel 16 to rotate, the first worm wheel 16 rotates to make the two-way screw 41 rotate, and the two-way screw 41 rotates to make the two connecting blocks 42 approach each other. When approaching, the connecting block 42 drives the steel wire 34 to move, the steel wire 34 pulls the positioning block 32 to rise, the positioning block 32 moves to make the positioning rod 31 move, and the positioning rod 31 moves to make the roller 311 rise, thereby making the roller 311 out of contact with the bottom surface, supporting The bottoms of the legs 2 are in contact with the bottom surface, so as to improve the stability of the infant chair and prevent the infant chair from shifting during feeding by adults.

The above are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore: all equivalent changes made according to the structure, shape and principle of the present application should be covered within the scope of the present application. Inside.

Claims (9)

1. An adjustable toddler chair, comprising a chair seat (1), a support leg (2) installed on the chair seat (1), a chair back (6) installed on the chair seat (1), The chair back (6) is provided with a tray (64) for holding dishes, and is characterized in that: an adjustment component (3) is arranged on the support leg (2), and the adjustment component (3) comprises a A positioning rod (31) provided in the support leg (2), a positioning block (32) fixedly sleeved on the positioning rod (31), and a first spring fixed on one end of the positioning block (32) (33) and a steel wire (34) fixed at the other end of the positioning block (32), rollers (311) are installed at both ends of the positioning rod (31), and the support legs (2) are provided with The positioning block (32) is slidingly fitted with the positioning groove (231), and the end of the first spring (33) away from the positioning block (32) is fixedly connected with the inner bottom surface of the positioning groove (231), A control assembly (4) for pulling the steel wire (34) is installed on the chair seat (1). 2 . An adjustable infant chair according to claim 1 , characterized in that: an installation cavity ( 15 ) is opened in the chair seat ( 1 ), and the control assembly ( 4 ) comprises a rotatable installation on the The two-way screw (41) on the inner side wall of the installation cavity (15), the connecting blocks (42) arranged at both ends of the two-way screw (41), the connecting block (42) and the two-way screw (41) ) thread fit, the end of the steel wire (34) away from the positioning block (32) penetrates into the installation cavity (15) and is fixedly connected with the adjacent connecting block (42), the connection The block (42) is rotatably connected to the inner bottom surface of the installation cavity (15), the bidirectional screw (41) is fixedly sleeved with a first worm gear (16), and the chair seat (1) is pierced with a function A hand wheel (171) is provided on the first worm (17) meshing with the first worm gear (16). 3. An adjustable infant chair according to claim 1, characterized in that: the support leg (2) comprises a fixing section (21) arranged on the chair seat (1) and a fixing section (21) arranged on the chair seat (1) A moving section (22) in the fixed section (21), the moving section (22) is slidingly matched with the fixed section (21), and the fixed section (21) is provided with a positioning pin (211), so The moving section (22) is provided with a plurality of positioning holes (221) along its own length direction for the insertion and matching of the positioning pins (211). 4. An adjustable infant chair according to claim 2, characterized in that: one end of the chair seat (1) is provided with a first rotating rod (12), and the other end of the chair seat (1) is rotatably installed There is a second rotating rod (14), and the supporting legs (2) are divided into front legs (24) mounted on both ends of the first rotating rod (12) and front legs (24) mounted on both ends of the second rotating rod (14) In the rear leg (25), the chair seat (1) is provided with a drive assembly (5) for driving the first rotating rod (12) and the second rotating rod (14) to rotate. 5. An adjustable infant chair according to claim 4, characterized in that: the drive assembly (5) comprises a drive rod (51) passing through the chair seat (1), rotatably mounted on the The second worm (52) on the inner side wall of the installation cavity (15) and the two second worm gears (53) for meshing with the second worm (52), the drive rod (51) is fixed on the A driving gear (511) is sleeved, a driven gear (142) for meshing with the driving gear (511) is fixedly sleeved on the second rotating rod (14), and a second worm gear (53) The second worm wheel (53) is fixedly sleeved on the first rotating rod (12), and the other second worm gear (53) is fixedly sleeved on the driving rod (51). The second worm (52) rotates the power assembly (7). 6. An adjustable infant chair according to claim 5, characterized in that: a power cavity (61) is opened in the chair back (6), and the power component (7) comprises a sliding through the The insertion rod (71) in the chair back (6), the first gear (72) and the second gear (73) rotatably mounted on the inner side wall of the power cavity (61), The rack (74) in the back of the chair (6), the first gear (72) and the second gear (73) are in mesh with each other, and a clip (712) is fixedly connected to the plug-in rod (71). , the inner side wall of the first gear (72) is provided with a slot (721) for sliding engagement with the clip (712), and the second worm (52) is provided with a slot (721) for accommodating the plug The rod (71) and the slot (521) of the clip (712), the rack (74) and the driving gear (511) are engaged with each other, and the rack (74) is fixedly connected with a pull rod (741) ). 7. The adjustable infant chair according to claim 6, wherein a fixing ring (713) is fixedly sleeved on the plug-in rod (71), and a fixed ring (713) is sleeved on the plug-in rod (71) There is a second spring (714), one end of the second spring (714) is fixedly connected with the fixing ring (713), and the other end of the second spring (714) is fixedly connected with the first gear (72). 8. An adjustable toddler chair according to claim 1, characterized in that: side plates (11) are fixedly connected on both sides of the chair seat (1), and a guardrail is provided on the chair back (6). (62), the guard rail (62) is rotatably connected with the chair back (6), and the guard rail (62) is in abutment with the side plate (11). 9. An adjustable infant chair according to claim 8, characterized in that: a fixing frame (63) is rotatably installed on the chair back (6), and the fixing frame (63) is fixed to the tray (64) connected, and the bottom of the tray (64) is provided with an accommodating groove (641) for snapping with the guard rail (62).

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