Experimental rock limited particle size crushing device

The invention discloses an experimental rock particle size limiting crushing device. The experimental rock particle size limiting crushing device comprises a feeding mechanism, a crushing mechanism and a screening mechanism; the crushing mechanism comprises a crushing box arranged at the bottom of the feeding box, a crushing cavity is formed in the top in the crushing box, first baffles are horizontally and slidably arranged on the two sides of the bottom of the crushing cavity, and the first baffles on the two sides can open or close the bottom of the crushing cavity when stretching out and drawing back; the screening mechanism comprises a screening box arranged at the bottom of the crushing box, a fixed cross beam is arranged in the screening box, a vertically upward electronic telescopic rod is arranged on the fixed cross beam, a fixed rod is arranged at the upper end of the electronic telescopic rod, first screens are arranged on the two sides of the fixed rod, and one side of each first screen is connect