Pneumatic demolition tool is a tool that uses high-pressure gas cylinder as the power source to drive the reciprocating strong movement of piston to drive the alloy steel cutter head for demolition operation. In addition to conventional land demolition, it can also be used for underwater operation: here, only three pneumatic demolition tools, namely pneumatic cutter, pneumatic circular saw and pneumatic diamond chain saw, are introduced.
1) Pneumatic cutter
The pneumatic cutter (Fig. 4-50) is mainly composed of breaking and dismantling cutter head, air pipe pressure reducing valve and breaking and dismantling gun. It can be driven by air source such as air respirator bottle, air compressor and automobile brake. It is suitable for emergency rescue departments, traffic police and armed police forces to cut doors, windows, glass, automobiles, pull rods and thin walls in case of fire, earthquake, car accident and sudden attack rescue.
2) Pneumatic circular saw
Pneumatic circular saw (Fig. 4 51) is a pneumatic demolition tool that uses air compressor or high-pressure air bottle to drive pneumatic motor to run at high speed to realize quick cutting with pneumatic cutting knife. It can be operated by one person. It is suitable for fire fighting, local exhibition, public security, civil defense and other rescue operations. It can cut steel pipes, steel bars, iron pipes, doors and windows, concrete, etc. Taking the cds125 pneumatic circular saw as an example, its power source is provided by compressed air, the air flow needs to reach 900l / min, the rated air pressure is 0.7 MP + power is 3245w, the saw blade diameter is 350mn and the cutting depth is 125mm. It can quickly cut large-diameter steel pipe equipment to realize rapid rescue.
3) Pneumatic Gang stone chain saw
Pneumatic diamond chain saw (Figure 4-02) is composed of imported diamond chain saw head, hydraulic hose assembly and self pressurized cooling water tank. The hydraulic hose assembly connects the air source with the diamond chain saw. The air pressure provided by the air source drives the diamond chain strip to cut according to the high-speed operation. During operation, the cooling water flows to the cutting part through the hole in the middle of the chain plate to cool and reduce dust. The cutting speed is fast, and the rotating speed reaches 6000r / min; Light weight, one person can operate. It can be used in rock and mine mining, masonry of closed wall, and concrete and rock breaking during rescue.
