When selecting the appropriate type of helical gear for mining conveyor systems, consider the following key factors:

1. **Load Requirements**: Choose the right gear type based on the working load of the conveyor.

Helical gears are suitable for high-load mining conveyor systems because they can withstand significant axial and radial loads.

2. **Transmission Efficiency**: Select helical gear types with high transmission efficiency to ensure minimal energy loss during power transmission. Helical gears generally have higher efficiency than straight gears.

3. **Installation Space**: Consider the installation space of the equipment and choose a compactly designed helical gearbox for easy installation and maintenance within limited spaces.

4. **Environmental Adaptability**: Mining environments are typically harsh, so it is necessary to choose gears made of corrosion-resistant and wear resistant materials to ensure stable operation in high-temperature, dusty, and humid conditions.

5. **Noise and Vibration Control**: Select helical gear types that can effectively reduce noise and vibration to improve the comfort of the working environment and the reliability of the equipment.

6. **Maintenance and Servicing**: Consider the maintenance requirements of the gears and choose helical gear types that are easy to maintain and service to reduce operating costs and extend the service life of the equipment.

7. **Drive Method**: Choose the appropriate type of helical gear based on the drive method of the conveyor (such as electric motor drive or hydraulic drive) to ensure compatibility with the drive system.

8. **Design Standards and Specifications**: Follow relevant design standards and safety specifications, such as the “Safety Code for Belt Conveyors in Coal Mines” (MT654—2021), to ensure that the selected gears meet industry requirements.

By considering these factors comprehensively, you can select the most suitable type of helical gear for mining conveyor systems, thereby improving the efficiency and reliability of the system.