Handheld borehole defect pressurized detection device for thermal-expansion rock splitting agent

The invention relates to a handheld borehole defect pressurized detection device for a thermal-expansion rock splitting agent and belongs to the crossing field of engineering technologies and borehole defect detection. The device comprises a pressurizing rod, a first air flap, a second air flap, a third air flap, a fourth air flap, a diaphragm, an air storage chamber, a multi-gear valve, a hollow plug, a compensating pipe, an air pressure gauge and an air guide pipe. The device is small in occupied space, convenient to carry, simple in operation and safe and reliable in detection process, can be handheld to operate, is safe and convenient, is applicable to borehole defect detection conditions for the thermal-expansion rock splitting agent and can achieve borehole defect air-tightness detection for the thermal-expansion rock splitting agent.