Automatic unfolding foot stand

A foot stand, comprising:

• a pull rod assembly, wherein a first blocking member is arranged on an outer peripheral wall of the pull rod assembly;
• an installation sleeve, slidably sleeved on the pull rod assembly;
• a plurality of support legs, wherein one end of each support leg is rotatably arranged on the installation sleeve;
• a fixing base, mounted at the bottom of the pull rod assembly, wherein a second blocking member is arranged on the fixing base;
• a plurality of connection rods, in one-to-one correspondence with the support legs, wherein a first end of each connection rod is rotatably arranged on one of the support legs, and a second end of each connection rod is rotatably arranged on the fixing base;
• a sleeve assembly, comprising a protective sleeve, a first slidable sleeve, a second slidable sleeve, and an elastic component, wherein the first slidable sleeve and the second slidable sleeve are respectively slidably sleeved on the pull rod assembly, the elastic component is sleeved on the pull rod assembly and is located between the first slidable sleeve and the second slidable sleeve, the protective sleeve is sleeved on the elastic component, a first end of the protective sleeve is connected to the second slidable sleeve, and a second end of the protective sleeve is connected to the installation sleeve;
• and
• a locking and unlocking mechanism, arranged at the bottom of the pull rod assembly, wherein the locking and unlocking mechanism is configured to lock the second end of each of the plurality of the support legs to maintain the support legs in a closed position, and also configured to unlock the second end of each of the plurality of the support legs to allow the support legs to automatically unfold to an open position;
• wherein in the closed position, the first slidable sleeve abuts against the first blocking member, and in the open position, the second slidable sleeve abuts against the second blocking member.