Adjustable chute structures

An adjustable chute structure, comprising at least one chute and two cross beams disposed at two ends of the chute, each of the two ends of the chute being connected with a chute plug, the chute plug being slidably mounted on the two cross beams, wherein

• the chute plug is provided with a receiving groove, the receiving groove is provided with a movable switch, and a first mating member and a second mating member coupled with the movable switch;
• the two cross beams are provided with a plurality of first limiting members arranged consecutively in a lengthwise direction, and the chute engages or plug-fits with the first limiting member through the first mating member, to fix the chute between the two cross beams in a transverse direction;
• and
• each of the two cross beams is provided with a second limiting member, and the chute is interlocked and connected with the second limiting member through the second mating member, to fix the chute to the two cross beams in a longitudinal direction.