Telescopic support foot and support frame

A telescopic support foot, comprising a plurality of telescopic assemblies, wherein the telescopic assemblies each comprise:

• a first telescopic rod (10) with a first end inserted into a second end of a second telescopic rod disposed outside of the second telescopic rod (10), wherein a telescopic rod disposed inside of the telescopic rod (10) is inserted into a second end of the telescopic rod (10);
• a first limiting device (20) connected to the first end of the first telescopic rod (10);
• a second limiting device (30) connected to the second end of the second telescopic rod (10), wherein the first limiting device (20) on the first telescopic rod disposed inside of the second telescopic rod (10) abuts against the second limiting device (30) of the second telescopic rod (10) to limit separation of the first telescopic rod disposed inside of the second telescopic rod (10) from the telescopic rod (10);
• and
• a locking device (40) arranged at the second end of the second telescopic rod (10), connected to the second limiting device (30), and configured to lock or unlock the second limiting device (30), wherein the second limiting device (30) is separated from the second end of the second telescopic rod (10) when the locking device (40) is in an unlocked state, to enable the first telescopic rod disposed inside of the second telescopic rod (10) to be separated from the telescopic rod (10);
• wherein the second limiting device (30) comprises a third limiting sheet (31) and a fourth limiting sheet (32) that are arranged on an inner side of the second telescopic rod (10), a first clamping head (311) and a third limiting protruding portion (312) are arranged on the third limiting sheet (31), a second clamping head (321) and a fourth limiting protruding portion (322) are arranged on the fourth limiting sheet (32), one side of the second end of the second telescopic rod (10) is provided with a first through groove (81) and a third limiting groove (82) communicating with the first through groove (81), the other side of the second end of the second telescopic rod (10) is provided with a second through groove (83) and a fourth limiting groove (84) communicating with the second through groove (83), and the locking device (40) is connected to the first clamping head (311) and the second clamping head (321) when the third limiting protruding portion (312) extends into the third limiting groove (82) through the first through groove (81) and the fourth limiting protruding portion (322) extends into the fourth limiting groove (84) through the second through groove (83), so as to limit separation of the first-telescopic rod disposed inside of the second telescopic rod (10) from the telescopic rod (10).