On site construction drawings

Model representation:

P: Concrete spraying machine
S: Wet jet machine
7: Production capacity of 7m3/h
I: Direct cavity type

Main technical parameters:

Structure and working principle:

1. Feeding hopper 2. Screen mesh 3. Puller 4. Discharge hopper 5. Discharge seat 6. Pulling shaft 7. Upper rubber wear-resistant plate 8. Rotor body 9. Material chamber 10. Steel lining plate 11. Lower rubber wear-resistant plate 12. Panel 13. Elbow sleeve 14. Cone sleeve 15. Second layer steel wire braided hose 16. Accelerating agent discharge stop valve 17. Nozzle combination 18. Conveyor pipe 19. Cyclone 20. Wheel set 21. Second layer steel wire braided hose 22. Cyclone inlet stop valve 23. Divider 24. Main air path stop valve 25. Gearbox 26. Three phase asynchronous motor 27. Accelerating agent inlet stop valve 28. Hand cranked lubricating oil pump 29. Filter pressure reducing valve 30. Cover plate 31. Pressure reducing valve 32. Pneumatic diaphragm pump 33. Accelerating agent box 34. Vacuum electromagnetic starter 35. Frame 36. Three ring chain 37. Connection pin 38. Nameplate 39. MA label 40. Pressure Table 41. Limit support 42. Pneumatic vibrator 43. Spring 44. Compressor 45. Panel lifting ear

1. Structure
The jet machine is mainly composed of a driving device, a rotor assembly, an air path system, a lubrication system, a clamping device, a jet system, and other parts:
A: The driving device is mainly composed of an electric motor and a gearbox. The fully enclosed oil immersed reducer is installed at the bottom of the machine, with three-stage gear transmission, a total transmission ratio of about 70, and a transmission efficiency of about 92%. The electric motor is installed vertically on the reducer, parallel to the rotor shaft.
B: The rotor assembly mainly consists of the rotor body, steel lining plate, and material cavity. The steel lining plate is installed perpendicular to the axis of the rotor body at the upper and lower ends of the rotor body, and the material cavity is installed in 10 material cavity seat holes parallel to the axis of the rotor body and evenly distributed on the circumference.
C: The pneumatic system consists of a separator, pressure gauge, main pneumatic shut-off valve, cyclone inlet shut-off valve, accelerator pump inlet shut-off valve, vibrator pneumatic shut-off valve, etc.
D: The lubrication system mainly consists of a hand cranked lubrication pump, distributor, nylon lubrication pipe, etc. By laying oil passages in the upper and lower rubber wear-resistant discs and manually lubricating the oil pump, the joint surface between the rotor body steel lining plate and the upper and lower rubber wear-resistant discs is effectively lubricated, greatly reducing the wear of the rotor body on the rubber wear-resistant discs during operation, thereby significantly extending the service life of the upper and lower rubber wear-resistant discs.
E: The clamping device is installed between the panel and the hopper seat. By rotating and clamping the screw sleeve, pressure is applied to the sealing surface between the upper and lower rubber wear-resistant disks and the wear-resistant disk, improving the sealing effect, reducing dust escape, and avoiding excessive wear caused by the rubber plate being pressed too tightly, thus extending the service life.
F: The spraying system consists of a conveying pipe and a nozzle combination. The conveying pipe is made of wear-resistant mortar pipe, and the nozzle is made of polymer material injection.

2. Mechanical working principle
The working principle of this device is as follows: the mixed wet material is fed into the sprayer through the vibrating screen from the discharge port of the batching mixer (or manually mixed and loaded), and then injected into the material chamber of the rotor assembly by the agitator. The material chamber rotates with the rotor body to the discharge port, where compressed air is introduced from the air system to blow the material into the discharge elbow. Another high-pressure air is introduced by the cyclone, which disperses and accelerates the material in a multi head vortex shape, causing it to rotate and float. It then enters the feeding hose, reaches the nozzle, and adds an appropriate amount of accelerating agent before spraying onto the sprayed surface.

Usage and Operation

The operator must carefully read the user manual and be familiar with the machine structure and operating procedures before starting work.
1. Preparation before startup
A. Check whether the connecting components of the whole machine are firm and whether the rotating and sliding parts are flexible and reliable.
B. Observe the oil sight glass and check if the lubricating oil in the gearbox is sufficient.
C. Connect the drive motor to the power supply, jog the motor to observe whether the rotation direction of the rotor body is consistent with the arrow direction. If not, adjust the phase of the power supply.
D. Adjust the clamping mechanism, first manually pre tighten, then use a wrench to tighten 2-3 turns, bend the feeding pipe, open the main and upper air circuit shut-off valves, and observe whether there is gas overflow at the rubber joint plate when the pressure gauge is around 0.3Mpa.

2. Jet job
Firstly, open the main air path shut-off valve, the feeding seat intake shut-off valve, and the cyclone inlet shut-off valve. Then start the motor, open the vibrator air path shut-off valve, add the mixture to the hopper, and start the spraying operation. During work, the host operator should pay attention to observing the residual air holes on the side of the host. If residual material is discharged, the intake air supply of the cyclone should be appropriately reduced until there is no material discharged from the residual air port of the machine and the equipment is working normally.

3. Shutdown operation
Before stopping the machine, first stop adding materials. When there is no material spraying from the nozzle, add a small amount of wet sand and gravel to the hopper. Rinse the residual materials in the hopper and rotor chamber several times. When there is no material spraying from the nozzle, turn off the motor power and all gas shut-off valves.

safety warning

1. The product is strictly prohibited from being used for dry (water cement ratio<0.2) spraying operations. For wet jet products, the water cement ratio of the applicable mixture added to the feeding port must be ≥ 0.2; For wet jet products, the water cement ratio of the applicable mixture added to the feed inlet must be ≥ 0.4.
2. This machine is a mechanical equipment for high dust operations, and the dust concentration may reach 20mg/m3. It is important to choose products with relatively low dust levels. When in use, dust prevention and dust reduction measures should be taken in the workplace, and operators should wear dust masks.

Other precautions are as follows:

1. Before starting up, first check whether the various circuits and contacts in the circuit system are secure, whether there is any damage or leakage.
2. Check the clamping force applied to the rubber sealing plate. The inspection method is to bend the feeding pipe, open the air path valve, and wait until there is no air pressure leakage at the rubber sealing plate when the pressure is greater than 0.3 MPa.
3. The clamping device of the sprayer must be clamped during transportation underground in coal mines.
4. The connection and maintenance of the electronic control system must be carried out by professional personnel in accordance with the relevant requirements of GB3836.1-4.
5. The cables connected to this machine should be products that comply with coal industry standards and have a mining product safety mark permit. The underground cable and the machine should be firmly and reliably connected to prevent major accidents caused by improper cable connection.
6. The supporting components, important components, and raw materials in the jet machine shall be selected from those that meet the standard requirements. Users shall not replace them arbitrarily during use. If replacement is necessary, components or raw materials that meet the relevant standard requirements shall be selected.
7. The concrete spraying of this machine is powered by compressed air, and the intake air pressure should not exceed 0.7MPa during use; When shutting down, the intake valve should be reliably closed to prevent accidents caused by the instantaneous opening of the injection system.
8. When the machine is working normally, the compressed air pressure is 0.5 MPa. When performing spraying operations, the operator of the main engine should observe the pressure gauge of the air path at any time. If it is greater than 0.7 MPa, the machine should be stopped immediately to check for blockage. After the air pressure is normal, normal operation can be resumed.
9. During spraying operations, it is necessary to strictly prevent long and large metal objects such as bolts and nuts from entering the material chamber to avoid causing machine damage accidents.
10. There is a continuously rotating rotor at the lower part of the feeding port of this machine. Do not insert your hands into the feeding port; When disassembling the rotor, be sure to stop the machine to prevent the rotor from getting caught.
11. Before stopping the machine, blow out the remaining materials in the conveying pipeline, clean the machine, turn off the power and gas sources, and loosen the clamping device.