Pneumatic cementing is the use of gas during cementing way to lose bulk cement, thus improving the working conditions and improve work efficiency. Pneumatic cementing the need to address the use of cement storage, loading, transportation and unloading problems. Total corresponding bulk cement silo equipment, transport gray tankers, wellsite ash storage tank, ash hopper, high pressure manifolds, back tank and air compressor.
One, Pneumatic cementing process
Bulk cement process shown in Figure 1. When the storage of bagged cement by first breaking the bag machined into bulk cement, which is output by the spiral tube fed through ash gray bulk storage tank.

Figure 1 Bulk cement process
1- ash outlet, 2- butterfly, 3- bottom tuyeres, 4- screw conveyor, 5- gearbox, 6- ash hopper, 7- cutter, 8- motor
When gray, gray bulk storage tanks and transport ash gray tank inlet hose connection, and to pass into the air storage tank gray, gray cement tanker ship that is blown from the tank, and then transferred by transport tankers Wells Gray ash storage tank farm storage.
With grout cementing process is shown in Figure 2. The wellsite ash storage tank outlet and ash hopper connection, the mixer and stir into the cement slurry for cementing the use, under the ash content can be equipped with a control valve and valve to adjust.

Figure 2 with the slurry flow chart
l- ash storage tank, a gray butterfly 2-, 3- ash hose, 4-ash hopper, gray surface indicator window 5-, 6- mixer, 7 grout outlet pipe, 8- concrete ponds
Wellsite ash storage tank from the back tanker handling and transport.
Second, transport ash tanker
Transport tankers are many kinds of gray, here is a QH2-10 op gray tank, the main specifications are shown in Table 1.
Table 1 QH2-10 op gray tank Technical Specifications

Gray tank works shown in Figure 3. Gray tank by three bearings mounted on automobile frames. When the ash, ash pipe and cement silo ash ash storage tank hose connecting to the storage tank through the ash into the air, gray cement that is transported into the tank. When cinder, will head into the gray tube sealed into the trachea open channel to transport the ash cans aspirated. Compressed air into the tank through the ash cone portion 8 gasification mouth tank, so that the flow of cement into the gasification state, the intake pressure of about 2 kg / cm, the bottom air damper mouth aspirated again, pouring cement can be blown. Unloading a can of cement (5 tons) about 4 to 5 minutes.

Figure 3 gray tank
1- tanks,2- gasification mouth into the trachea,3- into the gray tube,4- bottom air damper mouth,5- hole flange,6- gasification mouth,7- bearing,8- ash pipe
Gasification is a porous mouth stick, aperture 6 mm, 20 -30 mm pitch. Sets out the rod in a porous thin rubber sheath, when the outside air through the hole blown through the gap into the rubber sleeve ash storage tank, cement gasification (outside the cement particles attach a layer of air, such that the flow like a liquid). When not in use, the rubber sleeve close to the mouth of the hole on gasification, will not fall into the hole so that the cement block gasification mouth.
Between two gray tank, equipped with the right side of the car rotary vane air compressors, one Taiwan, which is powered by an automobile engine supplied by cardan shaft.
Three, back tanker
Back tanker is 25 tons wellsite transitions ash storage tank transport equipment. Now commonly used in the production of BGC-2500Y Sichuan type back tanker, a total technical specifications in Table 2.
Table 2 BGC-2500Y-type back tanker technical specifications

The main procedure is back tanker unloading and canning jar, its action program shown in Figure 4, and for a brief introduction.

Figure 4 back tanker operating procedure
l- gantry, 2 wellsite ash storage tank, 3 large hook, 4-cylinder jars rocker pin, 5-lifting cylinder, 6-control box, 7 jack, 8 skids
Unloading tank: large tank in the car's handling is achieved by a hydraulic system. When large pot shipped to the well site, the first car following extremely heavy wooden fill, start the pump, the hydraulic system pressure was increased to 140 kg / sq cm, Open the car in front of the control box slot left, operatives station In ground control, flip the control handle extremely heavy, extremely heavy rear of the vehicle will top off the ground. Then flip the gantry control handle, mounted on both sides of the gantry gantry three cylinders will be jacked up, until perpendicular to the ground. Then flip the rocker control handle, loosen the rope hanging pot Dajun on the tank floor stand. The car is equipped with a special hook pulled out from the gray tank lug hanging pot Dajun, tipped gantry, back stiffened, then drove back to the tanker.
Canning: first tanker back alignment position booing large pot, place skids, start the pump, the hydraulic system pressure rose to 140 kg / cm, open control box, pulling the control handle extremely heavy, the top rear of the vehicle off the ground. Then flip the gantry control handle, gantry hydraulic cylinders on both sides of three gantry top to the vertical position. Then flip the rocker control handle, so taut rope hanging pot hook and large cans to improve the ground, slowly down the gantry, a large tank that Woyu car, back jin, ending canning work. Should be checked before the canning pot than ash, ash content can not exceed more than a ton tanker would otherwise overload the back.
Now back to the tanker Yellow card JN-150 cars for the chassis, power cars that 6135C diesel engine. Auto gearbox intermediate shaft driven by the growth of the box and then gear pumps, container growth ratio of 3.66, its operating handle is located behind the driver's seat.
Gantry gantry assembly is metal frame with a rocker, welded steel frame with a rectangular cross-section, and put the tank cylinder frame structure located within the gantry column, hydraulic cylinder upper unit pulleys, hydraulic cylinders up and down, drive pulleys and cranes Dajun rope on mobile tanks, will be able to raise such a big hook or big pot on decentralization.
Four, air compressor
Pneumatic cementing air compressor is indispensable equipment, cement needed to lose the exhaust pressure of about 2 kg / cm, and requires a larger displacement, which can accelerate the speed of sending ash, therefore, should pay attention to the choice of the selection Low large displacement type. At present, China Mobile comes with multi-purpose power YW9 / 7-type alternative, in the course should be careful not to make the pressure is too high. Every two large cans to be equipped with an air compressor.