Adjustable support

The utility model discloses an adjustable support relates to box roof beam preparation technical field, hydraulic support group including two parallels and symmetry setting, hydraulic support group all includes upper bracket, lower carriage, base and pneumatic cylinder, the lower carriage is fixed on the base, the upper bracket is located lower carriage top and lower carriage symmetry setting, and the both ends of upper bracket major axis all are equipped with the fixing base, and the upper bracket is articulated with the lower carriage, the pneumatic cylinder bottom is fixed in base one end, and pneumatic cylinder upper portion is articulated with the upper bracket, the fixing base passes through bolted connection with the upper bracket, crisscross setting of pneumatic cylinder in two hydraulic support groups, simple structure, convenient to use can rotate certain angle, has solved support angle?fixed problem nontunable, upset many times among the prior art, and safe and reliable improves work efficiency, re