Material solubiliser reactor for hydrolysis and/or wet fermentation and waste treatment plant with such a solubiliser and reactor

To provide an arm device for bedsides which fixes the angle between arms regardless of a torque which is applied to the connected section between the arms to hold the posture of the arms. For this arm device 1 for bedsides, a base 2, a first arm 10, a second arm 20 and a head mount 30 are connected by first to third turning shafts 13, 23 and 33. A first electromagnetic valve 80 is provided in a bypass 45 which communicates two liquid chambers 44a and 44b of a doubly acting type first hydraulic cylinder 40 provided between base 2 and the first arm 10. A second electromagnetic valve 90 is provided in a bypass 55 which communicates two liquid chambers 54a and 54b of a doubly acting type second hydraulic cylinder 50 provided between the first arm 10 and the second arm 20. The first electromagnetic valve 80 and the second electromagnetic valve 90 are operated by buttons 85 and 95 which are arranged on the head mount 30, and thus, the posture of the arm device 1 is changed.