Stroller frame

Abstract

A pram frame characterized in that it comprises a push rod assembly (1), a front support rod (2) and a rear support rod (3), each connected to wheels (10), wherein a connecting seat (31) is fixedly arranged at the upper end of the rear support rod (3), and a first connecting section (21) is fixedly arranged at the upper end of the front support rod (2), and a second connecting section (11) is fixedly arranged at the lower end of the push rod assembly (1), wherein a locking seat (32) is arranged on the inside of the connecting seat (31), wherein the locking seat (32) is connected to a seat assembly (4), wherein the seat assembly (4) comprises a mounting seat (41) which is detachably connected to the locking seat (32), wherein the mounting seat (41) is connected to a seat section (42) which is rotatable relative thereto, and the first connecting section (21) and the connecting seat (31) are rotatably connected about a first axis (A).the second connecting section (11) and the connecting seat (31) are rotatably connected about a second axis (B), a connecting rod (5) is arranged between the first connecting section (21) and the second connecting section (11), which is rotatably connected to both and is able to move the front support rod (2) to rotate towards the rear support rod (3) when the push rod assembly (1) is rotated, wherein the second connecting section (11) is provided with a locking groove (61), and the connecting seat (31) is rotatably connected to a rotating plate (62), wherein a locking hook (63) is arranged at one end of the rotating plate (62) which can engage and disengage from the locking groove (61), and a first return spring (64) is arranged between the other end of the rotating plate (62) and the connecting seat (31), which is able toto drive the rotating plate (62) to reset, and the rotating plate (62) is further connected to a release element (65) which projects from the connecting seat (31) and, when sliding downwards, is able to drive the rotating plate (62) to rotate and unlock, wherein the seat section (42) is provided with a pressure section (44) which is able to push the release element (65) to slide when the seat section rotates downwards relative to the mounting seat (41).

Description

Technical field

[0001] The present utility model relates to a stroller frame. State of the art

[0002] Strollers are common products for growing children. Modern strollers can generally be folded and unfolded. When unfolded, the child can use the stroller for rides, while when folded, it can be easily carried or stored. Currently, various stroller frames are available on the market, and their folding mechanisms are not entirely standardized. The present utility model therefore represents a novel stroller frame that differs from existing stroller frames. Disclosure of the utility model

[0003] The present utility model aims to remedy the shortcomings of the prior art and to provide a stroller frame with a simple structure and flexible folding mechanism.

[0004] The present utility model is solved by the following technical solutions: A pram frame comprising a push bar assembly, a front support bar and a rear support bar, each connected to wheels, wherein a connecting seat is fixedly arranged at the upper end of the rear support bar, and a first connecting section is fixedly arranged at the upper end of the front support bar, and a second connecting section is fixedly arranged at the lower end of the push bar assembly, wherein a locking seat is arranged on the inside of the connecting seat, the locking seat being connected to a seat assembly, the seat assembly comprising a mounting seat which is detachably connected to the locking seat, the mounting seat being connected to a seat section which is rotatable relative thereto, the first connecting section and the connecting seat being rotatably connected about a first axis, the second connecting section and the connecting seat being rotatably connected about a second axis.A connecting rod is arranged between the first connecting section and the second connecting section, rotatably connected to both and capable of rotating the front support rod to approach the rear support rod when the pushrod assembly is rotated; the second connecting section is provided with a locking groove; the connecting seat is rotatably connected to a swivel plate, with a locking hook arranged at one end of the swivel plate that can engage and disengage from the locking groove; a first return spring is arranged between the other end of the swivel plate and the connecting seat, capable of driving the swivel plate to reset; and the swivel plate is further connected to a release element that projects from the connecting seat and, when sliding downwards, is capable ofto drive the rotating plate for rotation and unlocking, wherein the seat section is provided with a pressure section capable of pushing the unlocking element to slide when the seat section rotates downwards relative to the mounting seat.

[0005] The release element comprises a body with a detent post at its upper end that engages in a detent hole in the rotating plate, and a counter block at its lower end that projects from the connecting seat and is capable of interacting with the pressure section. A second return spring is arranged between the connecting seat and the release element, capable of pushing the release element upwards to reset it.

[0006] A front crossbar is arranged at the lower end of the front support bar, and a rear crossbar is arranged at the lower end of the rear support bar, the front crossbar being provided with a swivel bar which is rotatable relative to it, a flexible strap being arranged between the swivel bar and the rear crossbar which is able to pull the swivel bar upwards when the stroller frame is in an unfolded state, a torsion spring also being arranged between the swivel bar and the front crossbar which is able to push the swivel bar to unfold when the stroller frame is folded, and the swivel bar resting on the ground and, together with the wheels, holding the folded stroller frame in an upright position when the stroller frame is in the folded state.

[0007] An auxiliary spring is arranged between the centers of the front support bar and the rear support bar, providing an auxiliary force for their relative rotation towards each other to bring them closer together, the auxiliary spring being in a deformed and extended state when the pram frame is unfolded.

[0008] The seating arrangement further comprises a backrest section and an armrest section which are rotatably connected to the rear end of the seat section, wherein a securing arrangement is arranged between the mounting seat, the seat section, the backrest section and the armrest section which is capable of securing the seating arrangement in the unfolded state.

[0009] The pressure section comprises a pressure block which is slidably connected to the seat section and is able to push the release element to slide when the seat section moves downwards relative to the mounting seat, wherein an elastic return element is arranged between the pressure block and the seat section which is able to push the pressure block to reset, the pressure block is provided with a first inclined surface, and the counter block is provided with a pressure surface which is able to push the first inclined surface to retract the pressure block into the seat section when the seat section is rotated upwards and opened.

[0010] A latching arrangement is arranged between the mounting seat and the detent seat, which is capable of locking the two, wherein the latching arrangement comprises a latching position located on the detent seat, and a latching block is arranged on the mounting seat which can slide laterally relative thereto to engage in or disengage from the latching position, the mounting seat is also connected to an actuating part which can slide vertically relative thereto to push the latching block to slide laterally, a first elastic element is arranged between the latching block and the mounting seat which is capable of pushing the latching block to reset, and a second elastic element is arranged between the actuating part and the mounting seat which is capable of pushing the actuating part to reset.

[0011] The actuating part comprises a knob projecting from the mounting seat, the knob being connected to a vertical rod capable of moving the locking block, the vertical rod having an opening groove on its side wall, and a laterally movable positioning block arranged between the vertical rod and the mounting seat, a locking section being arranged on the positioning block, a bayonet being arranged on the locking seat which can engage with and disengage from the locking section, a second inclined surface being arranged on the bayonet which interacts with the locking section, and a third elastic element being arranged between the positioning block and the mounting seat which is capable of moving the positioning block.wherein the third elastic element presses the positioning block into the opening groove and thus engages the locking section in the bayonet when the button is pressed, causing the locking block to disengage from the locking position, and where, when the seat assembly is lifted, the second inclined surface pushes the locking section out of the bayonet, causing the positioning block to disengage from the opening groove.

[0012] The seat section has a left-hand connecting housing, and the mounting seat comprises an outer base connected to the detent seat, and an inner base rigidly connected to the outer base, wherein the actuating part is arranged between the inner base and the outer base, the outer base having a right-hand connecting housing, wherein the locking arrangement comprises several locking grooves arranged on the left-hand connecting housing, several locking pins arranged on the right-hand connecting housing, and a locking block arranged between the left-hand connecting housing and the right-hand connecting housing, wherein the locking block is provided with teeth that engage in the locking grooves and toothed slots that engage in the locking pins, and a third return spring is further arranged between the locking block and the inner base.and a protruding opening ring is arranged on the backrest section, wherein a pressure projection is arranged on the inner wall of the opening ring, which is able, when the backrest section is rotated and folded, to move the locking block so that the toothed grooves disengage from the locking pins, the locking block is partially inserted in the opening ring, and a spiral surface is arranged on the locking block which can be pressed by the pressure projection, and furthermore a protruding projection is arranged on the locking block, wherein a locking connection groove is arranged on the armrest section which can engage in and disengage from the projection, and the sliding distance of the locking block is adjusted such that, when the pressure projection pushes the locking block to slide into a position in which the projection can disengage from the locking connection groove,the fuse block remains engaged with the fuse groove on the left connecting housing.

[0013] Compared to the prior art, the present utility model offers the following advantages: when the present utility model is folded, the seat section is first rotated downwards relative to the mounting seat. During this rotation, the pressure section of the seat section pushes the release element downwards. The release element pulls the rotating plate so that it rotates relative to the connecting seat, thereby disengaging the locking hook from the locking groove. After disengagement, the second connecting section, with the push rod assembly attached to it, can rotate relative to the connecting seat and move towards the rear support rod. In doing so, the second connecting section pulls the first connecting section via the connecting rod, causing it to rotate relative to the connecting seat. This, in turn, causes the front support rod to rotate on the first connecting section, bringing it closer to the rear support rod.As soon as the seat section is turned downwards, the locking hook can disengage from the locking groove. This makes folding the stroller frame convenient and quick, and the overall structure of the stroller frame is also very simple. Brief description of the drawings Fig. Figure 1 is a perspective view of the present utility model; Fig. Figure 2 is a side view of the present utility model; Fig. Figure 3 is an exploded view of the present utility model; Fig. Figure 4 is an enlarged view of position C in Fig. 3; Fig. Figure 5 is an enlarged view of position D in Fig. 3; Fig. Figure 6 is a first exploded view of the components of the present utility model; Fig. Figure 7 is an enlarged view of position E in Fig. 6; Fig. Figure 8 is a second exploded view of the components of the present utility model; Fig. Figure 9 is a third exploded view of the components of the present utility model; Fig. Figure 10 is a side view of the present utility model during folding; Fig. Figure 11 is a side view of the present utility model in its folded state; Fig. Figure 12 is a fourth exploded view of the components of the present utility model; Fig. Figure 13 is a fifth exploded view of the components of the present utility model; Fig. 14 is a perspective view of a fuse block; Fig. 15 is a partially schematic representation of a backrest section; Fig. Figure 16 is a partially schematic representation of an actuating part; Fig. Figure 17 is a first perspective view of the components of the present utility model; Fig. Figure 18 is a sixth exploded view of the components of the present utility model; Fig. Figure 19 is a second perspective view of the components of the present utility model. Detailed description of embodiments

[0014] As in the Fig. As shown in Figures 1 to 6, the pram frame essentially comprises a push bar assembly 1, a front support bar 2, a rear support bar 3, and a seat assembly 4. A second connecting section 11 is fixedly arranged at the lower end of the push bar assembly 1. A wheel 10 is arranged at the lower end of the front support bar 2, a first connecting section 21 is fixedly arranged at the upper end of the front support bar, and a front crossbar 22 is also arranged at the lower end. A wheel 10 is also arranged at the lower end of the rear support bar 3, a connecting seat 31 is fixedly arranged at the upper end of the rear support bar, and a rear crossbar 33 is arranged at the lower end. A locking seat 32 is arranged on the inside of the connecting seat 31, the locking seat 32 serving to connect to a seat assembly 4.

[0015] As in Fig. 2 and the Fig. As shown in Figures 7 to 9, the first connecting section 21 and the connecting seat 31 are rotatably connected about a first axis A, and the second connecting section 11 and the connecting seat 31 are rotatably connected about a second axis B. To enable coordinated folding of the stroller frame, a connecting rod 5 is arranged between the first connecting section 21 and the second connecting section 11. The two ends of the connecting rod 5 are each rotatably connected to the first connecting section 21 and the second connecting section 11, respectively. When the push rod assembly 1 rotates to approach the rear support bar 3, the front support bar 2 can be moved synchronously by the force transmitted by the connecting rod 5 to rotate towards the rear support bar 3, thus achieving the folding action.

[0016] As in the Fig. As shown in Figures 7 to 9, the second connecting section 11 is provided with a locking groove 61 to lock the stroller frame in the unfolded position. The connecting seat 31 is rotatably connected to a pivot plate 62. A locking hook 63 is arranged at one end of the pivot plate 62, which can engage and disengage from the locking groove 61. A first return spring 64 is arranged between the other end of the pivot plate and the connecting seat 31. The first return spring 64 provides a driving force that tends to rotate the pivot plate 62 and cause the locking hook 63 to engage in the locking groove 61, thereby achieving locking. In this embodiment, the first return spring 64 is a tension spring that is in its initial state when the locking hook engages in the locking groove 61.When the locking hook 63 disengages from the locking groove 61, the tension spring is stretched and deformed. The rotating plate 62 is also connected to a release element 65, which protrudes partially from the connecting seat 31. As the release element 65 slides downwards, it can cause the rotating plate 62 to rotate, disengaging the locking hook 63 from the locking groove 61 and thus unlocking the device. A second return spring 66 is also arranged between the connecting seat 31 and the release element 65. This return spring serves to push the release element 65 upwards to reset it when no external force is acting upon it.In detail, the unlocking element 65 comprises a body 651, a locking post 652 is arranged at the upper end of the body 651, the locking post 652 engages in a locking hole 621 of the rotating plate 62; and a counter block 653 is arranged at the lower end of the body 651, the counter block 653 protrudes from the connecting seat 31 and serves to interact with the pressure section 44 described later.

[0017] As in the Fig. 3, Fig. 12 and Fig. As shown in Figure 13, the seat assembly 4 is detachably connected to the locking seat 32. The seat assembly 4 comprises a mounting seat 41, a seat section 42, a backrest section 43, and an armrest section 45. The mounting seat 41 can be detachably connected to the locking seat 32. The seat section 42 is rotatably connected to the mounting seat 41. The backrest section 43 is connected to the rear end of the seat section 42 and can be rotated relative to the seat section 42. The armrest section 45 is rotatably connected to the rear end of the seat section 42. To lock the seat assembly 4 in the unfolded position, a locking arrangement 46 is provided between the mounting seat 41, the seat section 42, the backrest section 43, and the armrest section 45.

[0018] As in the Fig. As shown in Figures 4 to 12, the seat section 42 is provided with a pressure section 44. When the seat section 42 rotates downwards relative to the mounting seat 41, the pressure section 44 can push the release element 65 downwards to slide, so that the locking hook 63 disengages from the locking groove 61. Specifically, the pressure section 44 comprises a pressure block 441, which is slidably connected to the seat section 42, and an elastic return element 442 is arranged between the pressure block 441 and the seat section 42. A first inclined surface 443 is formed on the pressure block 441. Correspondingly, a pressure surface 654 is formed on the counter block 653 at the lower end of the release element 65. When the stroller frame moves from an unfolded to a folded position, the pressure block 441 moves from the front to the rear of the counter block 653.When the seat section 42 is rotated upwards from the folded position and unfolded, the pressure surface 654 presses the first inclined surface 443 to retract the pressure block 441 into the seat section 42, thus preventing malfunctions during unfolding. As soon as the seat section 42 is rotated upwards and the pressure section 44 passes the counter block 653, the pressure block 441 extends under the influence of the elastic return element 442. When folding again, the pressure block 441, while rotating downwards with the seat section 42, again presses the counter block 653, causing the release element 65 to slide downwards.

[0019] As in the Fig. 4, Fig. 5 and Fig. As shown in Figure 12, a latching arrangement is provided to enable locking and unlocking between the mounting seat 41 and the latching seat 32. The latching arrangement includes a latching position 71 located on the latching seat 32. A latching block 72 is located on the mounting seat 41 and can slide laterally relative to it. The latching block 72 can be engaged in or disengaged from the latching position 71. The mounting seat 41 is also connected to an actuating element 73, which can slide vertically relative to it. A first elastic element 74 is located between the latching block 72 and the mounting seat 41 and serves to push the latching block 72 back into the latching position. A second elastic element 75 is located between the actuating element 73 and the mounting seat 41 and serves to push the actuating element 73 back into its position.When the actuating part 73 is pressed, the locking block 72 can disengage from the locking position 71, so that the seat assembly 4 can be disassembled.

[0020] As in the Fig. 12, Fig. 13 and Fig. As shown in Figure 16, the actuating part 73 comprises a knob 731 projecting from the mounting seat 41, and the knob 731 is connected to a vertical rod 732. The vertical rod 732 is provided with an opening groove 733 on its side wall, and a laterally movable positioning block 761 is arranged between the vertical rod 732 and the mounting seat 41, wherein a latching section 762 is arranged on the positioning block 761, a bayonet 321 is arranged on the latching seat 32, which can be engaged with and disengaged from the latching section 762, wherein a second inclined surface 322 is arranged on the bayonet 321, which interacts with the latching section 762, and a third elastic element 77 is arranged between the positioning block 761 and the mounting seat 41, which is capable of moving the positioning block 761.When button 731 is pressed, disengaging the locking block 72 from the locking position 71, the second elastic element 75 is compressed, and the third elastic element 77 presses the positioning block 761 into the opening groove 733. Simultaneously, the locking section 762 engages the positioning block 761 in the bayonet 321, preventing the vertical rod 732 from being lifted and thus maintaining the disengaged state of the locking block 72 from the locking position 71. The user can then release button 731 and has both hands free to remove the entire seat assembly 4. When the seat assembly 4 is lifted and an external force is applied to it, the second inclined surface 322 presses the locking section 762. This compresses and moves the third elastic element 77 through the locking section 762 and the positioning block 761.The locking section 762 disengages from the bayonet 321, and the positioning block 761 disengages from the opening groove 733. The vertical rod 732 is returned to its initial upward position by the action of the second elastic element 75.

[0021] As in the Fig. 1, Fig. 12 and Fig. As shown in Figure 13, a step adjustment mechanism is arranged to adjust the tilt angle of the backrest section 43. The step adjustment mechanism comprises several adjustment grooves 81, which are arranged centrally and symmetrically on the seat section 42. A sliding block 82 is arranged on the backrest section 43 and can slide relative to it. The sliding block 82 is provided with a locking block 821, which is capable of engaging in the adjustment groove 81. A handle 83 is also arranged on the backrest section 43 and can rotate relative to it. A pull cable 84 is arranged between the handle 83 and the sliding block 82. When the handle 83 is rotated, the sliding block 82 can be pulled upwards by means of the pull cable 84, thereby disengaging the locking block 821 from the current adjustment groove 81. A second return spring 85 is arranged between the sliding block 82 and the backrest section 43.

[0022] When the handle 83 is released, the sliding block 82 slides downwards under the action of the second return spring 85, so that the locking block 821 engages in a further adjustment groove 81 to enable step adjustment. To fold the backrest section 43, the handle 83 simply needs to be turned so that the locking block 821 disengages from the adjustment groove 81, and then the backrest section 43 can be rotated forwards.

[0023] As in the Fig. 17 and Fig. As shown in Figure 18, a double locking structure 9 is arranged between the handle 83 and the backrest section 43. This structure includes a release button 91, which slides on the handle 83 to ensure safety and prevent accidental activation. The release button 91 has a projection 92. The backrest section 43 has a locking surface 47 that can rest against the projection 92, and a release groove 48 that accommodates the projection 92. In the initial state, the locking surface 47 rests against the projection 92, thus preventing the handle 83 from rotating. Only when the release button 91 is moved, aligning the projection 92 with the release groove 48, can the handle 83 be rotated to disengage the detent block 821 from the adjustment groove 81.An elastic element 93 is arranged between the release button 91 and the handle 83, which serves to press the release button 91 to reset it.

[0024] As in the Fig. 1, Fig. 3 and Fig. As shown in Figure 11, the front crossbar 22 is equipped with a swivel bar 23 that can rotate relative to it. A flexible strap 24 is arranged between the swivel bar 23 and the rear crossbar 33. When the stroller frame is unfolded, the flexible strap 24 pulls the swivel bar 23 upwards. A torsion spring 25 is also arranged between the swivel bar 23 and the front crossbar 22. When the stroller frame is folded, the swivel bar 23 unfolds under the elastic force of the torsion spring 25 and thus rests against the base 101. Together with the wheels 10, it forms a support so that the folded stroller frame can be held in an upright position.

[0025] As in the Fig. 1 and Fig. As shown in Figure 2, an auxiliary spring 7 is also arranged between the centers of the front support bar 2 and the rear support bar 3. When the stroller frame is unfolded, the auxiliary spring 7 is in a deformed and extended state. Its elastic force provides an assistance force for the relative rotation of the front support bar 2 and the rear support bar 3 towards each other, thus enabling smooth folding. As shown in the Fig.As shown in Figures 12 to 15, the seat section 42 has a left connecting housing 461, and the mounting seat 41 comprises an outer base 411 connected to the detent seat 32, and an inner base 412 fixedly connected to the outer base 411, wherein the actuating part 73 is arranged between the inner base 412 and the outer base 411, the outer base 411 having a right connecting housing 462, wherein the locking arrangement 46 comprises several locking grooves 463 arranged on the left connecting housing 461, several locking pins 46a arranged on the right connecting housing 462, and a locking block 464 arranged between the left connecting housing 461 and the right connecting housing 462, wherein the locking block 464 has teeth 4641 that engage in the locking grooves 463, and toothed slots 4642 is equipped with locking pins that can be engaged in the locking pins 46a,A third return spring 465 is further arranged between the locking block 464 and the inner base 412, and a projecting opening ring 460 is arranged on the backrest section 43, wherein a pressure projection 466 is arranged on the inner wall of the opening ring 460, which is able, when the backrest section 43 is rotated and folded, to move the locking block 464 such that the teeth 4641 disengage from the locking grooves 463, the locking block 464 is partially inserted into the opening ring 460, and a spiral surface 467 is arranged on the locking block 464, which can be pressed by the pressure projection 466, and a projecting projection 468 is further arranged on the locking block 464, wherein a locking connection groove 469 is arranged on the armrest section 45, which can engage in and disengage from the projection 468. and the sliding distance of the locking block 464 is set such that,When the pressure projection 466 pushes the locking block 464 into a sliding position where the projection 468 can disengage from the locking groove 469, the locking block 464 remains engaged with the locking groove 463 on the left connecting housing 461. More precisely: when the backrest section 43 is rotated towards the seat section 42, the pressure projection 466 presses the spiral surface 467 of the locking block 464, causing the locking block 464 to slide laterally. After the locking block 464 has slid a certain distance, the projection 468 on it disengages from the locking groove 469, and the armrest section 45 rotates downwards first, approaching the seat section 42. The teeth 4641 of the locking block 464 and the locking grooves 463 on the left connecting housing 461 remain locked together,The seat section 42 and the mounting seat 41 remain locked. As the backrest section 43 continues to rotate, the pressure projection 466 pushes the locking block 464 further to slide. After the locking block 464 has slid a certain distance, the teeth 4641 of the locking block 464 disengage from the locking grooves 463 on the left connecting housing 461. Now the seat section 42 can rotate relative to the mounting seat 41 and approach the front support rod 1, thereby compressing the third return spring 465.

[0026] When the pram frame is unfolded, the push rod assembly 1 is first rotated relative to the rear support rod 3 and then unfolded. Simultaneously, the front support rod 2 is unfolded relative to the rear support rod 3 via the connecting rod 5. In the set position, the previously deformed first return spring 64 causes the rotating plate 62 to retract, so that the locking hook 63 re-engages in the locking groove 61. Next, the seat assembly 4 is unfolded. First, the backrest section 43 is rotated upwards and unfolded. As soon as the locking connecting block 821 is rotated until it is aligned with the adjustment groove 81, the second return spring 85 pushes the sliding block 82 into motion, causing the locking connecting block 821 to engage in the adjustment groove 81. The backrest section 43 is then pulled further upwards.This causes the backrest section 43 to drive the seat section 42 upwards, rotating it relative to the mounting seat 41. Once the seat section 42 has rotated upwards far enough that the locking block 464 is aligned with the locking groove 463, the third return spring 465 pushes the locking block 464 back into its original position. The locking block 464 engages in the locking groove 463 of the seat section 42, and the seat section 42 unfolds and locks into place. However, the projection 468 is still in contact with the side of the armrest section 45. The armrest section 45 is then rotated upwards until the projection 468 is aligned with the locking groove 469. The third return spring 465 springs back further, causing the projection 468 to engage in the locking groove 469 and the locking block 464 to engage deeper in the locking groove 463 of the seat section 42.The special adjustment of the previously described sliding distance of the locking block 464 eliminates the inconvenience caused by the simultaneous rotation of seat section 42 and armrest section 45 when unfolding the stroller frame. This demonstrates that the entire stroller frame can be folded and unfolded smoothly and flexibly, making it suitable for a wide range of uses.

Claims

[1] Stroller frame, characterized by, comprising a pushrod assembly (1), a front support rod (2) and a rear support rod (3), each connected to wheels (10), wherein a connecting seat (31) is fixedly arranged at the upper end of the rear support rod (3), and a first connecting section (21) is fixedly arranged at the upper end of the front support rod (2), and a second connecting section (11) is fixedly arranged at the lower end of the pushrod assembly (1), wherein a detent seat (32) is arranged on the inside of the connecting seat (31), the detent seat (32) being connected to a seat assembly (4), the seat assembly (4) comprising a mounting seat (41) which is detachably connected to the detent seat (32), the mounting seat (41) being connected to a seat section (42) which is rotatable relative thereto, the first connecting section (21) and the connecting seat (31) being rotatably connected about a first axis (A),the second connecting section (11) and the connecting seat (31) are rotatably connected about a second axis (B), a connecting rod (5) is arranged between the first connecting section (21) and the second connecting section (11), which is rotatably connected to both and is able to move the front support rod (2) to rotate towards the rear support rod (3) when the push rod assembly (1) is rotated, wherein the second connecting section (11) is provided with a locking groove (61), and the connecting seat (31) is rotatably connected to a rotating plate (62), wherein a locking hook (63) is arranged at one end of the rotating plate (62) which can engage and disengage from the locking groove (61), and a first return spring (64) is arranged between the other end of the rotating plate (62) and the connecting seat (31), which is able toto drive the rotating plate (62) to reset, and the rotating plate (62) is further connected to a release element (65) which projects from the connecting seat (31) and, when sliding downwards, is able to drive the rotating plate (62) to rotate and unlock, wherein the seat section (42) is provided with a pressure section (44) which is able to push the release element (65) to slide when the seat section rotates downwards relative to the mounting seat (41). [2] Stroller frame according to claim 1, characterized by , that the unlocking element (65) comprises a body (651) wherein a locking post (652) is arranged at the upper end of the body (651) which engages in a locking hole (621) of the rotating plate (62) and a counter block (653) is arranged at the lower end of the body (651) which protrudes from the connecting seat (31) and is able to interact with the pressure section (44). [3] Stroller frame according to claim 1, characterized by, that a front crossbar (22) is arranged at the lower end of the front support bar (2) and a rear crossbar (33) is arranged at the lower end of the rear support bar (3), the front crossbar (22) being provided with a pivot bar (23) which is rotatable relative to it, a flexible strap (24) being arranged between the pivot bar (23) and the rear crossbar (33) which is able to pull the pivot bar (23) upwards when the stroller frame is in an unfolded state, a torsion spring (25) also being arranged between the pivot bar (23) and the front crossbar (22) which is able to push the pivot bar (23) to unfold when the stroller frame is folded, and the pivot bar (23) resting on the ground and, together with the wheels (10), holding the folded stroller frame in an upright position when the stroller frame is in the folded state. [4] Stroller frame according to claim 1, characterized by , that an auxiliary spring (7) is arranged between the centers of the front support bar (2) and the rear support bar (3), which provides an auxiliary force for their relative rotation towards each other to bring them closer together, wherein the auxiliary spring (7) is in a deformed and extended state when the pram frame is unfolded. [5] Stroller frame according to any one of claims 2 to 4, characterized by , that the seat arrangement (4) further comprises a backrest section (43) and an armrest section (45) which are rotatably connected to the rear end of the seat section (42), wherein a locking arrangement (46) is arranged between the mounting seat (41), the seat section (42), the backrest section (43) and the armrest section (45), which is able to lock the seat arrangement (4) in the unfolded state. [6] Stroller frame according to claim 5, characterized by, that the pressure section (44) comprises a pressure block (441) which is slidably connected to the seat section (42) and is able to push the release element (65) to slide when the seat section (42) moves downwards relative to the mounting seat (41), wherein an elastic return element (442) is arranged between the pressure block (441) and the seat section (42) which is able to push the pressure block (441) to reset, the pressure block (441) is provided with a first inclined surface (443), and the counter block (653) is provided with a pressure surface (654) which is able to push the first inclined surface (443) to retract the pressure block (441) into the seat section (42) when the seat section (42) is rotated upwards and opened. [7] Stroller frame according to claim 5, characterized by, that a latching locking arrangement is arranged between the mounting seat (41) and the detent seat (32), which is capable of locking the two, wherein the latching locking arrangement comprises a latching position (71) which is arranged on the detent seat (32), and a latching block (72) is arranged on the mounting seat (41), which can slide laterally relative thereto to engage in or disengage from the latching position (71), the mounting seat (41) is also connected to an actuating part (73) which can slide vertically relative thereto to push the latching block (72) to slide laterally, a first elastic element (74) is arranged between the latching block (72) and the mounting seat (41), which is capable of pushing the latching block (72) to reset, and a second elastic element (75) is arranged between the actuating part (73) and the mounting seat (41), which is in the The situation isPress the actuating part (73) to reset. [8] Stroller frame according to claim 7, characterized bythat the actuating part (73) comprises a button (731) projecting from the mounting seat (41), the button (731) being connected to a vertical rod (732) capable of moving the locking block (72), the vertical rod (732) being provided with an opening groove (733) on its side wall, and a laterally movable positioning block (761) being arranged between the vertical rod (732) and the mounting seat (41), a locking section (762) being arranged on the positioning block (761), a bayonet (321) being arranged on the locking seat (32) which can be engaged with and disengaged from the locking section (762), a second inclined surface (322) being arranged on the bayonet (321) which interacts with the locking section (762), and between the positioning block (761) and the mounting seat (41) a third elastic element (77) is arranged which is able to move the positioning block (761),wherein the third elastic element (77) presses the positioning block (761) into the opening groove (733) and thus the locking section (762) engages in the bayonet (321) when the button (731) is pressed, causing the locking block (72) to disengage from the locking position (71), and when the seat assembly (4) is lifted, the second inclined surface (322) pushes the locking section (762) out of the bayonet (321), causing the positioning block (761) to disengage from the opening groove (733). [9] Stroller frame according to claim 7, characterized bythat the seat section (42) has a left connecting housing (461), the mounting seat (41) comprises an outer base (411) connected to the detent seat (32), and an inner base (412) fixedly connected to the outer base (411), wherein the actuating part (73) is arranged between the inner base (412) and the outer base (411), the outer base (411) has a right connecting housing (462), wherein the locking arrangement (46) comprises several locking grooves (463) arranged on the left connecting housing (461), several locking pins (46a) arranged on the right connecting housing (462), and a locking block (464) is arranged between the left connecting housing (461) and the right connecting housing (462), wherein the locking block (464) has teeth (4641) that engage in the locking grooves (463) can be snapped into place, and is provided with toothed grooves (4642) that can be snapped into the locking pins (46a),A third return spring (465) is further arranged between the locking block (464) and the inner base (412), and a projecting opening ring (460) is arranged on the backrest section (43), wherein a pressure projection (466) is arranged on the inner wall of the opening ring (460) which is able, when the backrest section (43) is rotated and folded, to move the locking block (464) such that the toothed grooves (4642) disengage from the locking pins (46a), the locking block (464) is partially inserted into the opening ring (460), and a spiral surface (467) is arranged on the locking block (464) which can be pressed by the pressure projection (466), and a projecting projection (468) is further arranged on the locking block (464), wherein a locking connection groove (469) is arranged on the armrest section (45). is, which can be engaged and disengaged from the projection (468), and the sliding distance of the locking block (464) is set such that,when the pressure projection (466) pushes the locking block (464) into a sliding position in which the projection (468) can be disengaged from the locking connection groove (469), the locking block (464) still remains engaged with the locking groove (463) on the left connecting housing (461). [10] Stroller frame according to claim 1, characterized by , that a second return spring (66) is arranged between the connecting seat (31) and the release element (65), which is able to push the release element (65) upwards to reset it.

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