Bare bottle pre-grouping and stacking device, stacking method and packaging apparatus

A bare bottle pre-grouping and stacking device, comprising:

• a bottle feeding and conveying mechanism configured to transport a plurality of columns of bare bottles;
• a grouping and conveying mechanism disposed downstream of the bottle feeding and conveying mechanism;
• a stacking and conveying mechanism disposed at an outlet end of the grouping and conveying mechanism and having a same conveying direction as the grouping and conveying mechanism, wherein a conveying speed of the stacking and conveying mechanism is smaller than a conveying speed of the grouping and conveying mechanism;
• and
• a pre-grouping mechanism, comprising a mechanical arm and a pre-grouping clamp, wherein the pre-grouping clamp is configured to clamp a plurality of rows of the plurality of columns of bare bottles, and the mechanical arm is configured to drive the pre-grouping clamp to perform at least one of translation or rotation within a spatial range to place bare bottles clamped by the pre-grouping clamp on the grouping and conveying mechanism in a stacking direction;
• wherein the pre-grouping clamp comprises:
• a mounting base, comprising a mounting plate fixedly connected to the mechanical arm;
• an arrangement mechanism, fixed on the mounting plate and comprising a limiting plate and at least two partitions, wherein the at least two partitions are fixed on the limiting plate in parallel and at intervals, bottle clamping space is formed between two adjacent partitions, and an open end of the bottle clamping space faces an outlet end of the bottle feeding and conveying mechanism;
• and
• a clamping mechanism, comprising a drive assembly and a clamping plate, wherein the drive assembly is disposed on the mounting plate and is configured to drive the clamping plate to rotate, and the clamping plate is capable of being located within the bottle clamping space at a bottle clamping position and capable of being located outside the bottle clamping space at a clamping-waiting position.