The invention provides a gas furnace gas tightness detection
machine, which comprises a rack and a pressure valve mechanism installed on the rack, the pressure valve mechanism comprises a cylinder installed on the rack and a connecting arm connected with a longitudinal telescopic rod of the cylinder, a steering motor is installed on the connecting arm, a longitudinal output shaft of the steering motor is provided with a universal
coupling, and the universal
coupling is connected with the cylinder. A working shaft of the universal
coupling is sleeved with a buffer spring, and the end of the working shaft is provided with a finger clamping air cylinder capable of clamping a valve body shaft. The valve pressing mechanism is responsible for pressing, clamping and rotating a valve body shaft of the switch valve by 90 degrees in the detection process. The downward pressing
stroke of the air cylinder is large, the actual downward pressing
stroke of the valve body shaft is short, in order to prevent the valve body shaft from being damaged, the buffer spring is pressed when the air cylinder is pressed downwards, redundant downward pressing force and
stroke are consumed, meanwhile, part of vibration is absorbed, and the valve body shaft is prevented from being damaged due to
overpressure. The universal coupling can compensate eccentricity,
deflection angle and axial deviation possibly occurring in the process of pressing down the valve body shaft, and it is further guaranteed that the valve body shaft is not damaged in the detection process.