two embodiments of a conveyor belt scraper are disclosed herein , with each including an inflatable bladder urging a scraper blade against the belt when the bladder is inflated , thereby providing even and uniform pressure for the blade against the belt . in a first embodiment , the scraper blade bears against a free section of the belt , with a guide extending across the opposite side of the belt to support the belt . the bladder is enclosed in a housing , with a blade slot formed in the upper portion thereof . a single belt scraper blade is placed within the housing and extends through the blade slot . a second embodiment urges the blade edge against the belt as the belt passes over a roller on the conveyor line . the blade has a double concave arcuate underside , with the two concave curvatures defining a pivot fulcrum therebetween . the inflatable bladder resides in the concave curvature opposite the scraping blade edge , and urges the blade edge against the belt as the bladder is inflated . in both embodiments , the bladder , housing , and blade have a length extending essentially the entire width of the conveyor belt with which they are installed and used . the blade is preferably formed of a relatively soft material , such as a urethane plastic , to minimize scoring and cutting of the belt . the blade is formed of a relatively thick and deep sheet of material , for reducing bending effects thereto . the bladder may be inflated with any compatible pneumatic or hydraulic fluid , as desired .