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A folding stroller having a frame that can be arranged in at least a first configuration and a second configuration, the frame including a handgrip fixedly connected to an upper joint, a lower joint pivotally connected to the upper joint, the lower joint being fixedly connected to a front tube, a re

A folding stroller having a frame that can be arranged in at least a first configuration and a second configuration, the frame including a handgrip fixedly connected to an upper joint, a lower joint pivotally connected to the upper joint, the lower joint being fixedly connected to a front tube, a rear joint pivotally connected to the lower joint, the rear joint being fixedly connected to a rear tube, and a joint connecting rod connected to the lower joint, the rear joint, and the upper joint, wherein a distance between the upper joint and the rear joint is larger than a predefined threshold while the frame is in the first configuration, while the frame is in the second configuration, and while the frame is transitioning between the first configuration and the second configuration.

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1. A folding stroller having a frame that can be arranged in at least a first configuration and a second configuration, the frame comprising: a handgrip fixedly connected to an upper joint;a lower joint pivotally connected to the upper joint, the lower joint being fixedly connected to a front tube;a

1. A folding stroller having a frame that can be arranged in at least a first configuration and a second configuration, the frame comprising: a handgrip fixedly connected to an upper joint;a lower joint pivotally connected to the upper joint, the lower joint being fixedly connected to a front tube;a rear joint pivotally connected to the lower joint, the rear joint being fixedly connected to a rear tube;a joint connecting rod connected to the lower joint, the rear joint, and the upper joint;wherein a distance between the upper joint and the rear joint is larger than a safety gap threshold that avoids nipping or shearing a user's hands while the frame is in the first configuration, while the frame is in the second configuration, and while the frame is transitioning between the first configuration and the second configuration;wherein the first configuration is a folded configuration and the second configuration is an unfolded configuration, the stroller further comprising a frame locking mechanism, the frame locking mechanism comprising: a front tube plug arranged in the front tube;a guide slot along the front tube plug;a locking pin arranged in the guide slota first elastic element arranged between the guide slot and the locking pin; anda traction piece affixed to the locking pin, the traction piece passing through a through hole arranged at a bottom part of the guide slot and the rear tube;wherein while the frame is transitioning from the first configuration to the second configuration, a blocking part attached to the frame locking mechanism can contact the locking pin, compress the first elastic element, and lift up a portion of the locking pin. 2. The folding stroller of claim 1, wherein: the upper joint comprises a first pivot point and a second pivot point;the rear joint comprises a third pivot point and a fourth pivot point;the lower joint comprises a fifth pivot point and a sixth pivot point;a first pivot shaft passes through the fifth pivot point and the first pivot point;a second pivot shaft passes through the sixth pivot point and the fourth pivot point;the upper joint is configured to rotate about the first pivot shaft; andthe rear joint is configured to rotate about the second pivot shaft. 3. The folding stroller of claim 1 wherein the upper joint, the rear joint, and the lower joint all have arc-shaped edges. 4. The folding stroller of claim 3 wherein the upper joint comprises an arc-shaped blocking component, the arc-shaped blocking component having a larger width than the arc-shaped edge of the lower joint, wherein during rotation of the upper joint toward the rear tube about the first pivot shaft, the arc-shaped edge of the lower joint is in contact with the arc-shaped blocking component. 5. The folding stroller of claim 1 wherein while the frame is transitioning from the second configuration to the first configuration, the traction piece is able to compress the first elastic element causing the locking pin to retract into the guide slot and the blocking part to enter an escape groove. 6. The folding stroller of claim 1 wherein the upper joint, the rear joint, and the lower joint each comprise plastic. 7. A folding stroller having a frame, the frame being foldable between a folded configuration and an unfolded configuration, the frame comprising: a handgrip, a front tube, a rear tube and a joint assembly,the joint assembly comprising an upper joint, a rear joint, a lower joint and a joint connecting rod; an upper end of the upper joint being fixedly connected with the handgrip, and the upper joint being provided with a first pivot point and a second pivot point;a lower end of the rear joint being fixedly connected with the rear tube, and the rear joint being provided with a third pivot point and a fourth pivot point;the lower joint being fixedly connected with the front tube, and the lower joint being provided with a fifth pivot point and a sixth pivot point;a first pivot shaft passing through the fifth pivot point and the first pivot point, the first pivot shaft pivotally connecting the lower joint with the upper joint;a second pivot shaft passing through the sixth pivot point and the fourth pivot point, the second pivot shaft pivotally connecting the lower joint with the rear joint;wherein opposite ends of the joint connecting rod are configured to be pivoted on the second pivot point and the third pivot point respectively,wherein, while the frame transitions between the folded configuration and unfolded configuration, the handgrip causes the upper joint to rotate about the first pivot shaft, and the joint connecting rod is able to cause the rear joint and the rear tube to rotate about the second pivot shaft causing the rear tube to approach or move away from the front tube. 8. The folding stroller according to claim 7, wherein a distance between the upper joint and the rear joint is larger than a safety gap threshold that avoids nipping or shearing a user's hands while the frame is in a configuration wherein: the first pivot shaft passes through the fifth pivot point and the first pivot point, and the opposite ends of the joint connecting rod are pivoted on the second pivot point and on the third pivot point respectively, and the second pivot shaft passes through the sixth pivot point and the fourth pivot point. 9. The folding stroller according to claim 8, wherein the joint connecting rod is arranged between the lower joint and the upper joint, and is in contact with the lower joint and the upper joint respectively, and wherein the lower joint, the upper joint and the rear joint all have arc-shaped edges. 10. The folding stroller according to claim 9, wherein a lower part of the upper joint is arc-shaped, and an arc-shaped blocking component is arranged at the lower part of the upper joint, the width of the arc-shaped blocking component being larger than that of the arc-shaped edge of the lower joint, wherein during rotation of the upper joint toward the rear tube about the first pivot shaft, the surface of the arc-shaped edge of the lower joint is able to contact the surface of the arc-shaped blocking component, thereby restricting the handgrip in a set position. 11. The folding stroller according to claim 7, wherein the folding stroller comprises a frame locking mechanism, and the frame locking mechanism comprises: a locking block pin, a first elastic element, a second elastic element, a front tube plug, a traction piece, an unlocking pedal and a locking pin blocker;the front tube plug is arranged in the front tube, and is arranged opposite to a lower end of the upper joint;a guide slot is arranged at an upper part of the front tube plug, and the locking pin is arranged in the guide slot, and the first elastic element is arranged between a bottom of the guide slot and the locking pin;a lower end of the locking pin is fixedly connected with one end of the traction piece, and the other end of the traction piece passes through a through hole arranged at the bottom of the guide slot and the rear tube, and is fixedly connected with the unlocking pedal which is pivoted on the rear tube;a notch is arranged at an upper end of the front tube plug, and the locking pin blocker is mounted in the notch;an upper end of the locking pin blocker is arranged opposite to the lower end of the upper joint, and a projecting first blocking part is arranged at the lower end of the upper joint; a middle segment of the locking pin blocker and the second elastic element are movably pivoted on the front tube plug by a third pivot shaft, and one end of the second elastic element is fixedly connected with the locking pin blocker;a projecting block portion is arranged at an upper part of the middle segment of the locking pin, and a first escape groove and a second escape groove are arranged on opposite sides of the projecting block portion respectively, wherein the second escape groove is closer to the first elastic piece than the first escape groove;an upper end of the locking pin is an arc-shaped bevel, and is provided with a second blocking part matched with the first blocking part;wherein during unfolding of the frame, the first blocking part is in contact with the arc-shaped bevel at the upper end of the locking pin, and compresses the first elastic piece; after the first blocking part passes the arc-shaped bevel at the upper end of the locking pin, the first blocking part lifts up the upper end of the locking pin blocker, and the locking pin blocker overcomes elastic force of the second elastic element and rotates about the third pivot shaft, and a lower end of the locking pin blocker approaches the lower end of the locking pin. 12. The folding stroller according to claim 11, wherein: when the frame is in the unfolded configuration, the locking pin projects out under elastic action caused by the first elastic piece, and the locking pin clamps the first blocking part between the upper end of the locking pin blocker and the second blocking part, and the lower end of the locking pin blocker is located in the second escape groove; andwhile the frame transitions from the unfolded configuration to the folded configuration, the traction piece is pulled to compress the first elastic piece, causing the locking pin to retract into the guide slot;after being pulled and overcoming frictional resistance between the projecting block portion of the locking pin and the lower end of the locking pin blocker, the lower end of the locking pin blocker falls into the first escape groove, and the projecting block portion is blocked by the lower end of the locking pin blocker to restrict the locking pin from projecting out, permitting the upper joint to rotate; andwherein the upper joint is rotated to release blocking of the locking pin blocker, and the locking pin blocker rotates about the third pivot shaft under the elastic action of the second elastic element, causing the lower end of the locking pin blocker to move away from the projecting block portion, and the locking pin is released and springs out under the action of the first elastic element. 13. The folding stroller according to claim 12, wherein a slotted hole is formed in the middle segment of the locking pin, and a fourth pivot shaft passes through the slotted hole and is fixedly connected with the front tube plug, wherein a retracting stroke of the locking pin is a length of the slotted hole. 14. The folding stroller according to claim 7, wherein the frame further comprises a seat support assembly including a reversing seat mount, a mount support base and a mount support connecting rod; the reversing seat mount and the mount support base are able to pivot on the lower joint by a fifth pivot shaft, and the mount support base is arranged between the reversing seat mount and the lower joint;the reversing seat mount and the mount support base are both rotatable about the fifth pivot shaft;opposite ends of the mount support connecting rod are able to pivot on the mount support base and the rear tube respectively; anda support part is arranged on a side surface of the reversing seat mount, and the support part is matched with a support point arranged on the front tube, wherein in a fully unfolded configuration of the frame, the support point supports the support part, thereby preventing rotation of the reversing seat mount; the mount support base is provided with a first positioning hole and a second positioning hole, and a clamping pin of a reversing seat is provided with a positioning post matched with the first positioning hole and the second positioning hole. 15. The folding stroller according to claim 14, wherein: the second positioning hole is a closed positioning hole, and the first positioning hole is an open hole of which a side wall is open, and the open hole and the reversing seat mount are combined to form a closed positioning hole;in the configuration where the reversing seat is inserted into the reversing seat mount and the positioning post is clamped into the second positioning hole, during folding of the frame, the rear tube drives the mount support base by means of the mount support connecting rod to rotate about the sixth pivot point with the lower joint, and the second positioning hole locks the positioning post, causing the clamping pin of the reversing seat to turn in the direction of the rear tube along with the mount support base;in the configuration where the reversing seat is inserted into the reversing seat mount, and the positioning post is clamped into the first positioning hole, during folding of the frame, the rear tube approaches the front tube, and the rear tube drives the mount support base by means of the mount support connecting rod to rotate about the sixth pivot point with the lower joint, causing the mount support base to drive the reversing seat mount to rotate toward the rear tube, thereby causing the support point of the front tube to move away from the support part of the reversing seat mount, and the reversing seat mount is movable relative to the reversing seat, which automatically approaches the front tube due to its own weight. 16. The folding stroller according to claim 7, wherein the upper joint, the rear joint, and the lower joint comprise plastic, steel or an aluminum alloy. 17. The folding stroller according to claim 7, wherein the handgrip, the front tube and the rear tube each comprises an integrally formed pipe.