Connection modules and modular assembled furniture

A connection module, comprising:

• a housing, a direction-changing device, an advancing device, and an adapter module;
• wherein
• the housing is provided with a first hole and a second hole, the first hole is perpendicular to and communicates with the second hole, and a nut groove is provided near an opening of the first hole;
• the direction-changing device includes an input member and an output member, the input member and the output member are respectively disposed in the second hole and the first hole, the input member is connected to the output member, and rotation of the input member in a horizontal direction drives the output member to rotate in a vertical direction;
• the advancing device is disposed in the first hole, the advancing device includes a bolt and a nut, the nut is disposed in the nut groove, the bolt includes a threaded portion and a smooth portion, the threaded portion is threadedly connected to the nut, the smooth portion is radially fixed and axially slidably connected to the output member, the smooth portion is provided with a circlip groove, a circlip is disposed in the circlip groove, a spring is disposed between the circlip and the nut, and the spring is disposed on the bolt;
• the adapter module is disposed at an exterior of the housing and includes a thread matching the bolt, and the adapter module is threadedly connected to the bolt after the bolt is advanced;
• an end face of the threaded portion of the bolt is provided with a safety groove;
• and
• the connection module further comprises a position limiting device mounted on the housing, the position limiting device includes a limiting part and a limiting foot, wherein the limiting part is connected to the limiting foot, the limiting part is provided with an adjustment opening, and the adjustment opening faces an input end of the input member.