CN207106576U - A foldable baby stroller seat - Google Patents

Abstract

The utility model discloses a folding baby stroller seat, which comprises a seat board, a backrest board and a front handrail component, wherein the rear parts of two sides of the seat board are provided with a base, the front part of the base is provided with a first joint, the lower parts of two sides of the backrest board are provided with connecting seats, and the connecting seats are respectively arranged at the inner sides of the corresponding bases in a pivoting way; the two ends of the front armrest component are provided with second joints, the second joints are pivotally arranged in corresponding first joints, the connecting seat is provided with a locking pin, a first locking groove matched with the locking pin is formed in the position, corresponding to the locking pin, of the inner side of the base, the locking pin can move between positions where the locking pin is clamped into the first locking groove and where the locking pin is withdrawn from the first locking groove along the connecting seat, when the locking pin is clamped into the first locking groove, the base and the connecting seat can be locked, the backrest plate is provided with a brace and a brace driving mechanism with a driving button, the lower end of the brace is connected with the locking pin, and the upper end of the brace is connected with the. The utility model discloses can singlehanded folding and expansion operation, convenient operation and efficient.

Description

A foldable baby stroller seat

technical field

The utility model relates to the technical field of baby strollers, in particular to a foldable baby stroller seat.

Background technique

Baby stroller is a carrying mobile tool designed for babies (or young children). It is convenient for adults to carry babies out to play or go shopping.

Traditional folding stroller seats are mainly made of flexible textile fabrics (the textile fabrics can be filled with cotton batting if necessary). And its seat cushion and backrest cushion bear the force through the seat cushion bearing tube and the rear support rod located on both sides of the frame respectively. When in use, the flexible seat cushion and backrest cushion will be severely dented and deformed due to the force in the middle, and the force is extremely low. Uniform, therefore, baby sits, the comfort degree of lying down is relatively poor, and not attractive in appearance.

For this reason, the prior art has also appeared a foldable baby stroller seat that is more comfortable for sitting and lying, which includes a seat plate with a flexible seat cushion on the load-bearing surface, and a backrest board with a flexible cushion on the load-bearing surface, wherein, Both sides of the seat plate are provided with connection seats behind, and the connection seats are connected with the handrail tube assembly and the backrest plate through the joint assembly. The seat plate and the backrest plate are plate-shaped structures made of plastic. The strength and stability are good, and when used, it will not cause serious concave deformation due to force (that is, the baby sits and lies on it), so the comfort of the baby can be improved, and the overall appearance is more beautiful. However, the existing foldable baby stroller seat still has deficiencies. The reason is that this foldable baby stroller seat does not have the function of one-hand linkage retraction. Resolve the problem of low efficiency and inconvenience.

Utility model content

The main purpose of the utility model is to provide a foldable baby stroller seat, which aims to realize the one-handed linked retraction operation of the folded baby stroller seat, so as to improve the convenience of the baby stroller seat retraction operation.

In order to achieve the above purpose, the utility model proposes a foldable baby stroller seat, which includes a seat board, a backrest board and a front armrest assembly. The rear parts on both sides of the seat board are provided with a base, and the front part of the base is provided with a second One joint, the lower parts of the two sides of the backrest board are provided with connecting seats, and the connecting seats can be pivotally installed on the inner side of the corresponding base; the two ends of the front armrest assembly are provided with second joints, and the second joints can be pivotally installed on the corresponding The first joint, the connecting seat is equipped with a locking pin, and the inner side of the base is provided with a first locking groove matching the locking pin at the position corresponding to the locking pin. The locking pin can be snapped into the first locking groove and the locking pin along the connecting seat. Move between the positions exiting the first locking groove, when the locking pin snaps into the first locking groove, the base and the connecting seat can be locked, the backrest board is provided with a pull bar and a pull bar drive mechanism with a driving button, the pull bar The lower end of the lower end is connected with the locking pin, and the upper end is connected with the rod driving mechanism. When the driving button of the rod driving mechanism is pressed, the rod can be driven to pull the locking pin out of the first locking groove, so as to release the locking pin from the base and the connecting seat. At this time, you can push the backrest and drive the front armrest assembly to fold towards the load-bearing surface of the seat; when the seat is fully unfolded and the pressure on the drive button is removed, the pull bar drive mechanism will drive the pull The bar is reset, and the locking pin is driven into the first locking groove to lock the base and the connecting seat.

The technical scheme of the utility model is equipped with a locking pin that can move along the mounting base between the position of being inserted into the first locking groove and the position of exiting the first locking groove, and a lower end is provided on the backrest plate to connect with the locking pin. The tie bar and the tie bar driving mechanism for driving the movement of the tie bar. When the seat of the folding stroller of the utility model needs to be folded, one hand can press the driving button of the pull rod driving mechanism to drive the pull rod to move and pull the locking pin out of the first locking groove, and release the lock pin from the base and the connection. After that, push the backrest to the load-bearing surface of the seat with one hand to drive the front armrest assembly to fold and flip in the direction of the seat until the folding operation is completed. The entire folding process can be linked with one hand Realization, easy operation and high efficiency. When the seat needs to be unfolded, the backrest can be pulled in the opposite direction with one hand, so that the backrest can swing away from the bearing surface of the seat until the seat is fully unfolded, and the pressure of pressing the drive button is removed (i.e., release drive button), at this time, the pull bar driving mechanism drives the pull bar to reset, and drives the locking pin to move to the first locking groove, so as to re-lock the base and the connecting seat, preventing the backrest plate and the The seat board rotates relatively. The entire process of unfolding and locking can also be realized with one hand, which is convenient and efficient.

Description of drawings

Fig. 1 is the perspective view of the expanded state of the foldable stroller seat of the utility model;

Fig. 2 is a schematic diagram of the folding baby stroller seat of the utility model in the unfolded state and after the cover plate is separated;

Fig. 3 is a partially exploded schematic view of the foldable baby stroller seat of the present invention;

Figure 4 is an enlarged detailed view of part A of Figure 3;

Fig. 5 is a right view of the unfolded state of the seat of the folding stroller of the utility model;

Fig. 6 is the right side view of the foldable baby stroller seat of the utility model when the seat is folded to the backrest and the front armrest assembly is just driven to rotate;

Fig. 7 is the right side view of the folding stroller seat of the utility model after it is completely folded;

Fig. 8 is a left view of the backrest of the foldable stroller seat of the utility model;

Fig. 9 is a three-dimensional schematic diagram of the mounting seat of the foldable baby stroller seat of the present invention;

Fig. 10 is a schematic diagram of the connection between the tie bars and the locking pins of the foldable baby stroller seat of the present invention.

Detailed ways

The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

It should be noted that if there are directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, vertical, counterclockwise, clockwise, Circumferential, radial, axial...), the directional indication is only used to explain the relative positional relationship, motion, etc. When the attitude changes, the directional indication changes accordingly.

In addition, if there is a description related to "first" or "second" in the embodiment of the present utility model, the description of "first" or "second" is only for the purpose of description, and should not be interpreted as an indication or Implying their relative importance or implying the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , also not within the scope of protection required by the utility model.

The utility model provides a folding baby stroller seat.

As shown in Figures 1 to 10, in the embodiment of the utility model, the foldable baby stroller seat includes a seat board 1, a backrest board 2 and a front armrest assembly 3, and the rear parts of the seat board 1 are provided with bases. 4. The front part of the base 4 is provided with a first joint 41, and the lower part of both sides of the backboard 2 is provided with connecting seats 55, and the connecting seats 55 can be pivotally installed on the inner side of the corresponding base 4 (the inner side referred to here , refers to the side wall of the base 4 facing the middle of the seat plate 1), the outer side of the base 4 is connected with the frame (not shown) of the folding stroller; the front armrest assembly 3 is in a U-shaped tubular structure, with The second joint 6, the second joint 6 can be pivotally mounted (or called hinged) on the corresponding first joint 41, the connecting base 5 is equipped with a locking pin 7, and the inner side of the base 4 is provided with a position corresponding to the locking pin 7. The first locking groove 42 where the locking pin 7 fits, the locking pin 7 can move along the connecting seat 5 between the position of being stuck into the first locking groove 42 and the position of withdrawing from the first locking groove 42, and the locking pin 7 is stuck into the first locking groove 42. When slot 42 (at this time, the seat is in the unfolded state), the base 4 and the connecting seat 5 can be locked so that the connecting seat 5 cannot rotate relative to the base 4, and the backrest board 2 is also provided with a pull bar 10 and a drive The tie bar drive mechanism 9 of the button 91, the lower end of the tie bar 10 is connected with the locking pin 7, and the upper end is connected with the tie bar drive mechanism 9. When the seat of the folding stroller of the utility model needs to be folded, the tie bar drive mechanism 9 can be pressed. The drive button 91 of the pull bar, and the pull bar 10 is driven by the pull bar driving mechanism 9 to pull the locking pin 7 out of the first locking groove 42, so as to release the lock of the locking pin 7 on the base 4 and the connecting seat 5. At this time, the back can be pushed Rely on the board 2 and drive the front armrest assembly 3 to fold and flip in the direction of the load-bearing surface of the seat board 1 (or called the top surface of the seat board) until the folding operation is completed; Lean on the board 2, make the back board 2 swing away from the bearing surface of the seat board 1 until the seat is in a fully unfolded state, remove the pressure of the drive button 91, so that the rod driving mechanism 9 drives the rod 10 to reset , and drive the locking pin 7 into the first locking groove 42 to lock the base 4 and the connecting seat 5 . Prevent the relative rotation of the back board 2 and the seat board 1 during use. The entire folding and unfolding process can be realized with one hand, and the operation is convenient and efficient.

It should be noted that the seat plate 1 and the backrest plate 2 can preferably be made of plastic, which has the advantages of convenient molding and low cost. Simultaneously, in order to make the baby sit and lie comfortably, it is preferable to pad the force-bearing surface of the seat plate 1 and the backrest plate 2 respectively by flexible seat cushions and back cushions for the baby to sit and lie.

In the embodiment of the present utility model, as shown in Fig. 2, Fig. 3 and Fig. 10, the bearing surface of the backrest board 2 is provided with a guide groove 21 extending downward from the upper slope, and the tie bar 10 can Slidingly placed in the guide groove 21, the brace 10 includes a base bar 101 and a support bar extending from the lower end of the base bar 101 to the locking pins 7 on both sides. segment 102 and a straight segment 103 with one end connected to the lower end of the bent segment 102, the other end of the straight segment 103 is connected to the locking pin 7 directly or through an intermediate piece, and the rod driving mechanism 9 drives the rod 10 along the guide groove 21 When moving, the locking pin 7 can be driven to move between the position of inserting into the first locking groove 42 and withdrawing from the position of the first locking groove 42, so as to lock the base 4 and the connecting seat 5, or release the connection between the base 4 and the connecting seat 5. locking. Specifically, each connection seat 5 is provided with a guide through hole 51 opposite to the first locking groove 42, and the position of the backrest plate 2 corresponding to the guide through hole 51 is provided with a guide slide groove 22 connected to the guide through hole 51 (see Fig. 3. Figure 4), the other end of the straight line section 103 has a connecting block 104, the connecting block 104 is installed in the guide chute 22, and the side wall of the part of the locking pin 7 located in the guide chute 22 is provided with an annular slot 71, each connecting block 104 is provided with two first limiting plates extending to the outside of the annular card slot in the direction of the through hole 51, and the first limiting plate is provided with a card extending to the annular card slot 71 part 105, when the tie bar 10 pulls the connecting block 104 to move along the guide slide groove 22, the connecting block 104 can drive the locking pin 7 through the clamping part 105 to insert the first locking groove 42 and withdraw from the first locking groove 42 along the guide through hole 51 Move between locations. This connection mode is convenient for disassembling and assembling the locking pin 7. It should be noted that the locking pin 7 can also be directly connected to the connecting block without affecting the use.

Further, as shown in Fig. 2 and Fig. 3, the side wall of the guide groove 21 is provided with a second limiting plate 211, and the second limiting plate 211 extends to a part in contact with the front surface of the brace 10, so as to align the brace. 10 to limit the position to prevent the pull bar 10 from falling out of the guide groove 21 during use.

Specifically, as shown in Figures 1 to 3, the connecting base 5 is pivotally mounted (or hinged) on the inner side of the base 4 through a pivot (or a hinge, such as a rivet or a screw, not shown), and can Rotate about the axis of the pivot.

In the embodiment of the present utility model, as shown in Fig. 3, Fig. 4 and Fig. 8, an opening chute 43 is opened on the edge of the inner side of the base 4 (that is, the side wall facing the middle of the seat plate 1), A locking block 11 is installed in the opening chute 43, and the second joint 6 is provided with a second locking groove (not shown) that matches the locking block 11. When the locking block 11 is snapped into the second locking groove, the second The joint 6 and the base 4 are locked, and the rear part of the locking block 11 is provided with a first guide post 111 extending toward the connection seat 5, and the area of the connection seat 5 opposite to the first guide post 111 is provided with an opening for the first guide post 111 to insert. The first driving groove 52, the first driving groove 52 includes a circular arc-shaped initial section 521 and a non-arc-shaped driving section 522, the initial section 521 and the driving section 522 are connected, and the initial end wall of the initial section 521 When contacting the first guide post 111 , the seat is in a fully unfolded state, and when the connecting base 5 rotates relative to the base 4 , the first driving groove 52 and the first guide post 111 slide relatively. When the first guide post 111 and the first section 521 of the first drive groove 52 slide relatively, the first guide post 111 remains stationary in the opening chute 43 , and when the first guide post 111 and the first drive groove 52 When the driving section 522 slides relatively, the first guide post 111 moves back and forth along the opening chute 43 under the promotion of the groove wall of the non-arc-shaped driving section 522, and drives the locking block 11 to be inserted into the second locking groove (not shown in the figure). shown) or out of the second locking slot. Thus, the second joint 6 and the base 4 are automatically locked or unlocked, thereby realizing the linked folding and unfolding operation of the backrest board 2 and the front armrest assembly 3, and improving the folding and unfolding operation s efficiency.

Specifically, as shown in Figure 3, Figure 4 and Figure 8, the center of the arc-shaped initial section 521 and the rotation center of the connecting seat 5 are located on the same straight line (that is, both are located on the axis of the pivot shaft), so as to ensure that the first guide post When the first guide post 111 slides relative to the initial section 521 of the first driving groove 52 , the first guide post 111 remains stationary in the opening sliding groove 43 . Further, the first driving groove 52 also includes a circular buffer section 523 extending from the end of the driving section 522, and the buffer section 523 is also preferably located on the same straight line as the rotation center of the connecting seat 5, To cushion the sliding of the first guide post 111 along the opening chute 43 , when the first guide post 111 slides relative to the buffer section 523 of the first driving groove 52 , the first guide post 111 remains in the opening chute 43 Stationary, to prevent the first guide post 111 from moving too fast and causing jamming.

Further, as shown in Figures 1 to 4 and Figure 9, the seat of the folding baby stroller of the present invention also includes a sail bar 8, and two ends of the sail bar 8 are respectively provided with mounting seats 81, and the mounting seats 81 can be It is pivotally installed on the base 4, and after the backboard 2 is folded and rotated to a certain position in the direction of the load-bearing surface of the seat plate 1 (see Figure 6), the mounting seat 81 can be driven to drive the sail bar 8 to the bearing surface of the seat plate 1. Fold in the direction of force until the seat is folded (see Figure 7). Specifically, the mounting base 81 is pivotally mounted between the base 4 and the connecting base 5, and the junction area between it and the base 4 and the connecting base 5 is ring-shaped, and the purpose of being ring-shaped is not to hinder the mounting base. 81 turns. At the same time, care should also be taken not to obstruct the movement of the locking pin 7 . The surface of the connecting seat 5 facing the mounting seat 81 is provided with a second driving groove 53, and the surface of the mounting seat 81 facing the connecting seat 5 is provided with a second guide post 811 extending into the second driving groove 53. When the second guide post 811 is in contact with the start end wall of the second driving groove 53, the seat is in a fully unfolded state (see Figure 5). , the end of the second drive groove 53 is in contact with the second guide post 811, when the backrest board 2 continues to fold and rotate toward the load-bearing surface of the seat board 1, it can drive the second guide post 811 to rotate, and make the installation The seat 81 and the sail pole 8 are folded and rotated along with the backboard 2 toward the load-bearing surface of the seat plate 1 until the folding operation is completed (see FIG. 7 ).

Further, as shown in FIG. 1 , FIG. 4 and FIG. 9 , the side of the mounting base 81 facing the connecting base 5 is provided with an arc-shaped limiting shroud 812 or an arc-shaped limiting groove extending in the direction of the connecting base 5 (not shown), the connecting seat 5 is placed on the arc-shaped limit plate 812 or the arc-shaped limit groove, and can rotate relative to the arc-shaped limit plate 812 or the arc-shaped limit groove .

Further, as shown in FIGS. 2 to 4 , the side of the base 4 facing the connecting seat 5 is provided with a slot 44 adapted to the locking pin 7 at the position where the locking pin 7 is when the corresponding seat is fully folded. After the seat is completely folded, the slot 44 is opposite to the locking pin 7, and after the pressure of the driving button 91 is removed, the locking pin 7 can be inserted into the slot 44, and the connecting seat 5 and the base 4 are locked to prevent the The seat unfolds by itself when not in use. And when the seat needs to be launched, the drive button 91 can be pressed earlier, after the locking pin 7 is pulled out of the slot 44 by the pull bar 10, the backrest plate 2 can be rotated in a direction away from the bearing surface of the seat plate 1 until The seat is fully unfolded, and after that, the pressure of pressing the driving button 91 is removed, so that the pull bar 10 drives the locking pin 7 to snap into the first locking groove 42, and then the seat in the unfolded state can be locked.

In the embodiment of the utility model, as shown in Figures 1 to 5, the backrest plate 2 is provided with an installation groove 23 at the position above the guide groove 21, and the pull bar drive mechanism 9 includes a drive button 91 and a reset top spring 92. The button 91 includes a main body that is installed in the installation groove 23 and can move up and down along the installation groove 23, and a driving part 911 that extends backward from the main body out of the installation groove 23. The upper end of the reset top spring 92 is against the top wall of the installation groove 23 , the lower end is against the main body, when the driving part 911 is pressed upwards, the main body can be driven to overcome the top force of the reset top spring 92 and move upward along the installation groove 23, and the pull bar 10 is driven to pull the locking pin 7 out of the first locking groove 42, so as to Release the locking of the base 4 and the connecting seat 5, and remove the pressure of the driving part 911, the reset top spring 92 can push the main body down along the installation groove 23, and drive the pull bar 10 to push the locking pin 7 into the first locking slot 42 to lock the base 4 and the connecting seat 5. Specifically, the front side of the installation groove 23 is detachably fixed with a cover plate 24 that can cover the front side of the installation groove 23 to limit the position of the main body and prevent the main body from falling out of the installation groove 23 .

In the embodiment of the present utility model, as shown in Fig. 1 and Fig. 2 , the top end of the brace 10 extends into the installation groove 23, and is fixedly connected or clamped with the main body. The way of card connection is convenient for disassembly and assembly. The fixed connection method has higher structural stability and can be selected according to needs.

In the embodiment of the present utility model, as shown in Fig. 1, Fig. 3 and Fig. 4, the second joint 6 can also be pivotably connected (or called hinged joint) through a pivot (or called a hinge, such as a rivet, a screw, etc.). It is on the first joint 41 and can rotate around the axis of the pivot. Further, a reset torsion spring 61 is sheathed on the pivot, one end of the reset torsion spring 61 elastically abuts against the first joint 41 , and the other end elastically abuts against the second joint 6 , when the backrest board 2 moves away from the seat board 1 When turning in the direction of the bearing surface, the return torsion spring 61 pushes the second joint 6 to rotate with the connecting seat 5 until it reaches a predetermined position. Driven by 521, it gradually snaps into the locking groove (not shown) of the second joint 6 to lock the second joint 6 on the base 4 .

The above is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. Under the utility model concept of the utility model, the equivalent structural transformation made by using the specification of the utility model and the contents of the accompanying drawings, Or directly/indirectly used in other related technical fields are all included in the patent protection scope of the present utility model.

Claims (10)

1. A foldable baby stroller seat, comprising a seat board, a backrest board and a front armrest assembly, the rear parts of both sides of the seat board are provided with bases, the front part of the base is provided with a first joint, and the back boards are two The lower part of the side is provided with a connecting seat, and the connecting seat can be pivotally mounted on the inner side of the corresponding base; the two ends of the front armrest assembly are provided with a second joint, and the second joint can be pivotally mounted on the corresponding first joint. That is: the connecting seat is equipped with a locking pin, and the inner side of the base is provided with a first locking groove matching the locking pin at a position corresponding to the locking pin, and the locking pin can be inserted into the first locking groove and withdrawn from the first locking groove along the connecting seat. Move between the positions of the locking grooves, when the locking pin is snapped into the first locking groove, the base and the connecting seat can be locked, the backrest board is provided with a pull bar and a pull bar drive mechanism with a drive button, the lower end of the pull bar is in contact with the The locking pin is connected, and the upper end is connected with the rod driving mechanism. When the driving button of the rod driving mechanism is pressed, the rod can be driven to pull the locking pin out of the first locking groove, so as to release the locking of the locking pin on the base and the connecting seat. At this time, the backrest can be pushed and the front armrest assembly can be driven to fold toward the load-bearing surface of the seat; and when the seat is in a fully unfolded state and the pressure of the drive button is removed, the pull bar driving mechanism will drive the pull bar to reset, And drive the locking pin into the first locking groove to lock the base and the connecting seat. 2. The foldable baby stroller seat as claimed in claim 1, characterized in that: the bearing surface of the backrest is provided with a guide groove extending downward from the upper slope, and the pull bar can be slidably placed in the guide groove. The brace includes a base bar and a support bar extending from the lower end of the base bar to the locking pins on both sides. The support bar includes a bent section whose upper end is connected to the lower end of the base bar and a straight line section whose one end is connected to the lower end of the bent section. The other end of the straight line section is directly or connected with the locking pin through an intermediate piece. When the pull bar is driven to move along the guide groove through the pull bar drive mechanism, the lock pin can be driven between the position of inserting into the first locking groove and withdrawing from the first locking groove. move. 3. The foldable baby stroller seat as claimed in claim 2, characterized in that: each connecting seat is provided with a guiding through hole opposite to the first locking groove, and the position of the backrest board corresponding to the guiding through hole is provided with a guiding through hole corresponding to the guiding through hole. The guide chute connected by through holes, the other end of the straight line section has a connecting block, the connecting block is installed in the guide chute, and the side wall of the part of the locking pin located in the guide chute is provided with an annular locking groove, and each connection The block is provided with two first limiting plates extending to the outside of the annular card slot in the direction of the through hole. The first limiting plate is provided with a card part extending to the annular card slot. When the guide slide groove moves, the connecting block can drive the locking pin to move along the guide through hole through the clamping portion between the position of inserting into the first locking groove and the position of withdrawing from the first locking groove. 4. The foldable baby stroller seat as claimed in claim 1, characterized in that: the inner edge of the base is provided with an opening chute, the opening chute is equipped with a locking block, and the second joint is provided with a locking block. Adapted to the second locking groove, when the locking block snaps into the second locking groove, the second joint and the base can be locked. The rear part of the locking block is provided with a first guide post extending toward the connecting seat, and the connecting seat and the second A first drive groove for inserting the first guide post is provided in a region opposite to the guide post, the first drive groove includes an arc-shaped initial section and a non-arc-shaped drive section, the initial section is connected to the drive section, and When the beginning end wall of the initial section is in contact with the first guide post, the seat is in a fully unfolded state. During the rotation of the connecting base relative to the base, the first driving groove and the first guide post slide relatively. When the first guide post and the first guide post When the first section of the first driving groove slides relatively, the first guide post remains stationary in the open chute, and when the first guide post and the driving section of the first driving groove slide relative to each other, the first guide post stays still in the non-circular Pushed by the groove wall of the arc-shaped driving section, it moves back and forth along the opening chute, and drives the locking block to move between the positions of inserting into the second locking groove or withdrawing from the second locking groove. 5. The foldable baby stroller seat as claimed in claim 4, characterized in that: the connecting seat is pivotally mounted on the inner side of the base through a pivot shaft, and can rotate around the axis of the pivot shaft. The center of the circle is on the same straight line as the rotation center of the connecting seat, and the first driving groove further includes a circular buffer section extending from the end of the driving section. 6. The folding baby stroller seat as claimed in claim 2, characterized in that: the backrest plate is located above the guide groove and is provided with an installation groove, and the pull rod driving mechanism includes a driving button and a reset top spring, and the driving button It includes a main body that is installed in the installation groove and can move up and down along the installation groove, and a driving part that extends out of the installation groove backward from the main body. When the driving part is used, it can drive the main body to overcome the top force of the reset top spring and move upward along the installation groove, and drive the pull bar to pull the locking pin out of the first locking groove. After the pressure on the driving part is removed, the reset top spring can push The main body goes down along the installation groove, and drives the pull bar to push the locking pin into the first locking groove. 7. The foldable baby stroller seat according to claim 1, wherein the second joint is pivotably connected to the first joint through a pivot shaft, and can rotate around the axis of the pivot shaft, and the pivot shaft is sleeved There is a return torsion spring, one end of the return torsion spring elastically resists the first joint, and the other end elastically resists the second joint, when the backrest plate turns away from the bearing surface of the seat plate, the return torsion spring pushes the second joint Rotate with the connecting seat. 8. The foldable baby stroller seat according to any one of claims 1 to 7, further comprising a sail bar, the two ends of the sail bar are respectively provided with mounting seats, and the mounting seats are pivotable Installed on the base. 9. The foldable baby stroller seat as claimed in claim 8, characterized in that: the mounting seat is pivotally installed between the base and the connecting seat, and the joint area between the base and the connecting seat is in the shape of a ring, and is connected to A second driving groove is provided on the surface of the seat facing the mounting seat, and a second guide post extending into the second driving groove is provided on the surface of the mounting seat facing the connecting seat, when the second guiding post and the second driving groove When the initial end walls are in contact with each other, the seat is in a fully unfolded state. When the backrest board is folded and rotated to a certain position toward the load-bearing surface of the seat board, the end of the second driving groove is in contact with the second guide column. When the board continues to fold and rotate towards the direction of the bearing surface of the seat plate, it can drive the second guide post to rotate, and make the mounting seat and the sail bar bar fold and rotate with the backrest towards the direction of the bearing surface of the seat plate. 10. The foldable baby stroller seat as claimed in claim 8, characterized in that: the side of the base facing the connection seat is provided with a button that fits the locking pin at the position where the locking pin is when the corresponding seat is fully folded. The slot, when the seat is fully folded, the slot is opposite to the locking pin, after the pressure of pressing the driving button is removed, the locking pin can be inserted into the slot, and the connecting seat and the base are locked together.