The invention relates to a treatment device for workpieces, having the following: a treatment chamber (1); a shaft (2) which extends through a wall of the treatment chamber (1) into the treatment chamber and which is mounted in a rotatable manner; an electric treatment unit (3) which is secured to the shaft (2); and a power supply arrangement (6) with a first supply line (61), an electric coupling (63, 64), a second supply line (62), and an actuating unit (7). The electric coupling (63, 64) has a first coupling element (63), which is secured to the shaft (2) outside of the treatment chamber (1), and a second coupling element (64). The first supply line (61) connects the electric treatment unit (3) to the first coupling element (63), and the second supply line (62) is connected to the second coupling element (64). The actuating unit (7) is designed to actuate the coupling (63, 64) in order to bring the second coupling element (64) into contact with the first coupling element (63) or release the second coupling element (64) from the first coupling element (63).

According to the present disclosure, methods and techniques for generating preferred concrete block products are provided. The methods and techniques involve providing addition of color to selected section within the blocks, as described herein, to generate enhancement effects. Typical applications involve spray applications for color pigment to visually distinct sections of the block on one or more decorative surfaces.

A spraying system includes a spraying device, a toasting device, a conveyor line, and a turning device. The spraying device is configured to spray a workpiece. The toasting device is configured to toast the workpiece. The conveyor line passes through the spraying device and the toasting device and is configured to convey the workpiece. The turning device is coupled to the conveyor line and includes a first fixing frame across the conveyor line, a turning mechanism, and a blocking member. The turning mechanism includes a bearing frame detachably coupled to the conveyor line, a rotation shaft rotatably coupled to the bearing frame; a rotatable member coupled to the rotation shaft; and a positioning member coupled to the rotation shaft and configured to couple the workpiece. The blocking member is coupled to the fixing frame and configured to block the rotatable member to rotate the rotation shaft, the positioning member.