Equipment Technical Performance and Manufacturing

Our company adopts an integrated structure of motor and impeller direct connection for cyclone machines, without a transmission system. It features high efficiency, energy saving, low noise, and simple installation and disassembly.

A brief description of our company's products is as follows:

1. Product Technical Features:

The fan is designed with optimized selection according to the parameters provided by the user, and personalized design is carried out to ensure high-efficiency operation of the fan in both the early and later stages.
The main body shell is made of high-quality Q235 steel plate welding. Advanced CO2 gas shielded welding center and automated CNC straight bar cutting machine are used during welding. Fan shell anti-corrosion treatment: both inner and outer surfaces are sandblasted and derusted, with two coats of epoxy zinc-rich primer and one coat of epoxy zinc-rich topcoat. Bolts are all galvanized. This ensures the rigidity, quality, and service life of the fan in this bid.
The fan blades are made of high-strength forged aluminum material. The blade design is based on the latest blade experimental data released by the space agency, using a large cross-section, high-strength three-dimensional twisted design, with high strength and a wide operating range.

The blades are manufactured using the most advanced manufacturing technology of Xi'an Aircraft Industry Corporation, ensuring product quality.

The fan hub is welded from steel plates of different thicknesses and bushings. In the design, the blades and hub both adopt a safety factor of more than 10 times, and are calculated by computer to fully ensure the strength of the blades and hub and the safe operation of the ventilation machine. The welding and heat treatment process of the hub ensures that the hub does not deform during use. Our factory's processing equipment can ensure that the equal division error of the blades after installation on the hub is no more than 0.5mm.

The matching motor for the fan uses a special explosion-proof motor, and the radial and axial force values are provided to the motor factory according to the ventilation parameters to ensure that the motor bearing temperature does not exceed the standard and the service life meets the requirements; the motor is equipped with an oil injection device, which can be continuously oiled without stopping, making maintenance convenient; the matching electric control has protection functions such as phase failure, overload, over (under) voltage, etc., can display the motor (stator or bearing) temperature, and can realize sound and light alarm.

The various components of the fan have a compact structure and are equipped with vibration damping rubber pads. The vibration speed ≤4.6mm/s meets the national standard requirements. After secondary verification, the double-sided dynamic balance quality is G5.6 grade. A blade "Material Performance Test Report" and the dynamic and static balance test report of the entire impeller are provided as standard.

The motor enclosure and silencer specially designed by our company can reduce the fan operating noise to below 85dB(A), meeting national standard requirements, and isolate the cooling airflow around the explosion-proof motor from the foul airflow discharged by the main mine ventilation fan. The isolation chamber is equipped with inlet and outlet air ducts that communicate with the atmosphere outside the shell. The airflow inside the air duct is negative pressure, and the cooling airflow around the motor communicates with the atmosphere at positive pressure, ensuring sufficient heat dissipation of the motor. A specially designed braking device fully meets the requirements of Article 122 of the "Coal Mine Safety Regulations" (changing the airflow direction in the roadway within 10 minutes).

The airlocks produced by our company are flexible in opening and closing, consume less power, can be remotely controlled or operated on-site, and are equipped with a manual device.

2. Fan Installation and Maintenance

Because this series of fans uses a direct-connected structure, the accuracy requirements for the installation foundation are not high. Even if the ground subsides and the fan tilts slightly (generally not exceeding 15°), it can still operate normally without affecting the normal and safe production of the mine; at the same time, this series of fans can directly use reverse rotation for reverse wind, and the reverse wind volume ≥60%, exceeding the requirements of Article 122 of the "Coal Mine Safety Regulations" (when the airflow direction changes, the air supply volume of the main ventilation fan should not be less than 40% of the normal air supply volume), without the need to repair the reverse air duct, reducing installation costs. In short, when installing the fan, simply place the fan on two rails laid on a solid ground and connect one end of the fan to the mine ventilation outlet. Because the fan uses a motor-directly-connected impeller structure, maintenance is simple, and generally only requires regular and quantitative oil injection to the motor as required.

The roller installation of the fan allows the various components of the fan to be pulled apart along the fan axis, making later equipment maintenance extremely convenient.

3. Quality Control of Key Components

Our company strictly controls the quality of each process from raw material selection to product delivery in accordance with ISO9001 standards. Key components such as motors, hubs, and blades are subject to particularly strict quality control.

The fan's matching motor can use well-known domestic products and is equipped with SKF, FAG, or NSK bearings, ensuring the service life of the fan's power system.
After the impeller hub is manufactured, static and dynamic balance tests are performed separately, and detailed reports are filled out. The dynamic balance balance grade is G5.6, higher than the national industry standard G6.3 requirement, thus ensuring the stability during fan operation and the service life of the motor bearings.

Each process from material selection and stamping to installation and commissioning is strictly controlled, with layer-by-layer quality inspection to ensure the quality and use requirements of the blades.

Product Quality Commitment and Guarantee

Our company's fans can fully meet your various parameter requirements such as air volume and air pressure, with a service life of more than 25 years. The product quality assurance measures are as follows:

From the entry of raw materials to the delivery of products, strict inspections are carried out in accordance with the ISO9001 international quality system standard. The production department, quality inspection department, and technology department jointly conduct production, inspection, testing, and acceptance of each process, and records are kept for filing. Full-process tracking quality management and service are provided for each user's product. The production and design of the fan are carried out according to GB/T3235 "Basic Types, Dimensions, Parameters and Performance Curves of Ventilation Machines", GB/T3235 "Basic Types, Dimensions, and Parameters of Ventilation Machines"; purchased motors must meet the technical requirements of GB/T 3836.1; product factory testing is carried out according to GB/T 1236-2000 standard for pipeline processing, measuring point layout, original data measurement, data calculation, and result output; steel materials require the manufacturer to provide material report forms, and at the same time, entrust a nationally recognized qualified inspection department to test the materials, which can only be used if they meet the requirements; matching motors require the motor factory to provide performance test reports, no-load test reports, etc. Provide users with non-destructive testing reports for fan blades; fan impellers are subjected to double-sided dynamic balance testing according to GB/T 9101 "Rotor Balance of Ventilation Machines", and the factory dynamic balance grade must reach G5.6 or higher than the national standard requirements. A dynamic balance test report of the impeller is provided to the user when the fan leaves the factory; fan surface painting is carried out according to the requirements of JB/T6886 "Painting Technical Conditions for Ventilation Machines"; fan nameplates are made according to the requirements of GB/T13306 "Nameplates".

IV. Main Features of the Fan

1. Impeller Arrangement: Adopts a direct-drive structure with the motor, and the impeller is fixed by connecting the shaft and hub key.

2. The overall dimensions of the fan include the variable diameter connecting wind pipe, collector, electric/manual butterfly valve (including electric heating), connecting wind pipe, primary host, secondary host, explosion-proof variable frequency motor, diffuser, round-to-square transition, silencer, diffusion tower, braking device, and supporting wheels, etc.

3. The fan is equipped with a manual and automatic integrated braking device, which can achieve normal start-up and reverse airflow within 5 minutes, and the reverse airflow rate is greater than 60% of the forward airflow.

4. The fan is designed with optimized selection according to the parameters provided by the user, personalized design is carried out to ensure high-efficiency operation of the fan in both the early and later stages.

5. The fan housing is made of Q235 steel plate welding. Two coats of epoxy zinc-rich primer and one coat of epoxy zinc-rich topcoat are applied at the factory, and all bolts are galvanized.

6. The silencer plates are made of galvanized steel, effectively extending the service life and reducing the cost of later replacement.

7. A protective ring is set at the rotating part of the main body housing and impeller. The protective tube and copper ring are fixed by explosion welding composite technology, which is non-detachable, safe and reliable.

8. Differences in blade fixing methods:

Cast aluminum alloy blades are fixed by tapered clamping, which is complex in processing but firm in fixing and easy to operate.

V. Improvement Measures and Application of New Technologies

1. In the design of ordinary motors, the heat dissipation capacity (ventilation cross-section) of the cooling fan is calculated based on natural conditions. However, the fan motor is placed in an isolated cavity, and the ventilation conditions are greatly limited. To solve the problem of poor ventilation, our company first increases the length of the isolated cavity (so that the airflow does not abruptly deflect 90 degrees for discharge, and the flow is smooth) and the ventilation cross-sectional area of the fresh air pipe (generally more than twice the motor cross-sectional area); secondly, the heat dissipation channel of the motor is designed independently (based on the design capabilities of the company's own advantages); so that the airflow enters from the air inlet and smoothly discharges the heat dissipation gas of the motor from the air outlet.

2. The use of a streamlined diffusion tower has reduced the outlet noise of the fan and increased efficiency by 2-4%.