Central locking structure of folding tent

1. A central locking structure of a folding tent, comprising a first pole hub, a second pole hub, a connecting rod, a locking assembly, and a drive assembly, wherein a bottom of the first pole hub is provided with the connecting rod, and a top of the second pole hub is provided with an insertion port; a lower end of the connecting rod is inserted in to the insertion port; the second pole hub is provided with a locking chamber communicating with the insertion port; the locking assembly is provided in the locking chamber, and is configured to fix the lower end of the connecting rod; and the drive assembly is configured to drive the locking assembly to lock or unlock the lower end of the connecting rod,

wherein the locking assembly comprises rollers and locking teeth circumferentially arranged on an outer wall of each of the rollers; a side wall of the connecting rod is axially provided with locking grooves, the locking grooves are matched with the locking teeth; a drive shaft is provided on two sides of each of the rollers; an inner wall of the locking chamber is provided with first oblong holes for the drive shaft to move; and when the drive assembly drives the drive shaft to move in the first oblong holes, the locking teeth on the outer wall of each of the rollers are locked into or disengaged from the locking grooves.

2. The central locking structure according to claim 1 , wherein the first oblong holes are inclined toward the connecting rod.

3. The central locking structure according to claim 2 , wherein the drive assembly comprises a sliding sleeve and a spring member; upper and lower ends of the second pole hub are respectively provided with an upper limiting piece and a lower limiting piece; the sliding sleeve is slidably sleeved on an outer wall of the second pole hub and is located between the upper limiting piece and the lower limiting piece; the sliding sleeve is elastically connected to the lower limiting piece through the spring member; an outer wall of the sliding sleeve is provided with second oblong holes; ends of the drive shaft are movably inserted into the second oblong holes through the first oblong holes; and the second oblong holes are inclined in a direction opposite to an inclined direction of the first oblong holes.

4. The central locking structure according to claim 3 , wherein a bottom end of the sliding sleeve and a top end of the lower limiting piece are respectively provided with an upper mounting groove and a lower mounting groove; upper and lower ends of the spring member are respectively inserted into the upper mounting groove and the lower mounting groove; and inner diameters of the upper mounting groove and the lower mounting groove are adapted to an outer diameter of a spring of the spring member.

5. The central locking structure according to claim 1 , wherein limiting grooves are provided in the locking chamber and located above the first oblong holes; and the limiting grooves are configured to limit left and right positions of the locking assembly in cooperation with the locking grooves when the locking teeth are locked into the locking grooves.

6. The central locking structure according to claim 1 , wherein a bottom end of the connecting rod extends inward to form a push head.

7. The central locking structure according to claim 1 , wherein there are two rollers provided on two sides of the connecting rod respectively.

8. The central locking structure according to claim 1 , wherein an inner diameter of the insertion port is larger than an outer diameter of the connecting rod; a lower end of the insertion port extends inward to form a limiting port; and an inner diameter of the limiting port is adapted to the outer diameter of the connecting rod.

9. The central locking structure according to claim 1 , wherein the first pole hub comprises a first pole hub body, and first hinge bases; the first hinge bases are circumferentially arranged on a bottom of the first pole hub body and are each hinged to an upper pole; the second pole hub comprises a second pole hub body, and second hinge bases; the second hinge bases are circumferentially arranged on a top of the second pole hub body and correspond to the first hinge bases; and the second hinge bases are each hinged to a first end of a lower pole, a second end of the a lower pole is rotatably connected to the upper pole.