Working principle and essentials of refractory shotcrete machine

November 08, 2018


How refractory shotcrete works

First open the main gas path, the upper gas path, the lower gas path shut-off valve, open the nozzle water supply shut-off valve, pre-wet the surface of the rock mass, then start the motor, open the vibrator air circuit stop valve, add the mixing material in the hopper, start the spraying operation . The nozzle operator should properly adjust the water supply volume of the nozzle to ensure that the material has a suitable water-cement ratio. The host operator should pay attention to observe the residual air hole on the side of the main unit. If there is any excess material discharged, the air supply volume of the lower air line should be appropriately reduced. Until the machine has no material discharge at the residual gas port, the equipment will work normally. Before stopping, first stop feeding, when there is no material sprayed at the nozzle, close the water supply shut-off valve, and add a small amount of wet sand to the hopper, and wash the residue in the hopper and rotor cavity several times, no nozzle When the material is ejected, turn off the motor power supply and each air circuit stop valve.

The agitated material is supplied to the jet hopper through the vibrating screen through the discharge port of the batching mixer, and is injected into the straight material cavity of the rotor body by the dipper, and is rotated to the discharge port, where it is rotated. The air chamber is supplied with compressed air to blow the material into the discharge elbow. Here, another pressure is introduced by the cyclone, and the material is blown, accelerated, and rotated, floated, and entered into the air in a multi-head wind spiral state. Feed the tube, reach the nozzle and add a small amount of supplementary water or liquid accelerator.

In order to obtain easy construction operations, we should prepare for the shotcrete before starting the machine.

1. Check whether the connecting parts of the whole machine are firm and whether the rotating parts are flexible and reliable.

2. Observe the cursor and check if the lubricating oil in the gearbox is sufficient.

3. The drive motor is connected to the power supply. The direction of the rotation of the rotary motor should be consistent with the direction of the arrow. Otherwise, the power supply should be phase-modulated.

4. The main gas path, the upper gas path, the lower gas path, the vibrator gas path, the nozzle water supply shut-off valve are placed in a closed state, and the main gas pipe is connected to the gas source. The water supply pipeline is connected to the water source, and the feed pipe is connected to the host.

5. Adjust the pressing mechanism, firstly pre-compact, then tighten the 2-3 diagram with a wrench, bend the delivery pipe, open the main gas circuit, the upper gas circuit stop valve, observe the pressure gauge at around 0.3Mpa, rubber There should be no gas spillage at the junction plate.

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