The combined use of stage electric hoists and trusses requires comprehensive consideration of multiple factors. The following are the specific methods and key points: Pre - planning - **Clarify usage requirements**: Based on the form, scale, and specific requirements of the stage performance, determine the weight, size, and quantity of the equipment and props to be hoisted, as well as requirements for hoisting height, movement range, speed, etc., in order to select electric hoists and trusses of appropriate specifications. - **Site measurement and layout**: Conduct a detailed measurement of the stage space, including the length, width, height of the stage, and the structure of the ceiling, etc. According to the site conditions and performance requirements, design the layout of the truss, determine its installation position, shape, and size, ensuring that the truss can reasonably cover the required hoisting area of the stage without affecting the stage performance and the use of other equipment. Selection of electric hoists - **Load - bearing capacity**: According to the maximum weight to be hoisted, select an electric hoist with an appropriate rated load. Generally, the rated load of the electric hoist should be at least 20% - 30% higher than the maximum hoisting weight to ensure a safety margin. - **Lifting height and speed**: Based on the height of the stage and the requirements for hoisting speed in the performance, select an electric hoist with a suitable lifting height and speed. The lifting height should be able to meet the need to lift the equipment or props to the required highest position, and the lifting speed should be determined according to the performance rhythm and effect, generally between 0.1 - 2 meters per minute. - **Drive mode and control functions**: Common drive modes include electric and manual, etc. For stage use, electric drive is generally the main choice. Control methods include wired control and wireless remote control, etc., with wireless remote control being more flexible and convenient. Electric hoists with functions such as precise positioning and multi - speed control can also be selected according to needs to meet the complex stage hoisting requirements. Selection of trusses - **Material and specifications**: Truss materials usually include aluminum alloy and steel, etc. Aluminum alloy trusses are lightweight, corrosion - resistant, and convenient for installation and handling; steel trusses have high strength and large load - bearing capacity. Select the appropriate material according to the actual load and usage environment. At the same time, according to the distribution of hoisting points and load conditions, select trusses of appropriate specifications, such as the cross - sectional size, rod diameter, and wall thickness of the truss. - **Structural form**: There are various structural forms of trusses, such as triangular trusses and quadrilateral trusses. Triangular trusses have good stability, while quadrilateral trusses have high space utilization and flexible shapes. Select the appropriate structural form according to the layout of the stage and performance requirements. For large - scale stages or cases where a large weight needs to be carried, combined trusses can be used to increase the overall strength and stability. Installation and commissioning - **Installation preparation**: Before installation, ensure that the stage floor is flat and solid, providing a stable foundation for the construction of the truss. Check whether the components of the electric hoist and truss are complete and in good condition, and prepare the required installation tools and safety equipment. - **Truss installation**: According to the design plan, first fix the base part of the truss on the stage to ensure that its levelness and perpendicularity meet the requirements. Then, build the truss section by section, and use connectors such as bolts and pins to firmly connect each section of the truss. During the construction process, check the overall structure of the truss for stability at any time. If necessary, set up temporary supports for reinforcement. - **Electric hoist installation**: Install the electric hoist on the truss, usually by connecting the installation bracket of the electric hoist to the nodes or rods of the truss. During installation, ensure that the installation position of the electric hoist is accurate, the connection is firm, and its running track is parallel to the truss to avoid deviations. At the same time, connect the power supply and control system of the electric hoist, and conduct preliminary electrical debugging to check whether the running direction and speed of the electric hoist are normal. - **Overall commissioning**: After the installation of the electric hoist and truss is completed, conduct overall commissioning. First, conduct no - load commissioning to check whether the electric hoist runs smoothly on the truss, and whether there are any jams, abnormal noises, etc. Then, conduct load commissioning, gradually increasing the hoisting weight, and checking the lifting capacity, braking performance of the electric hoist, and the deformation of the truss, etc. During the commissioning process, adjust the parameters of the electric hoist and the connection of the truss according to the actual situation to ensure the safe and stable operation of the entire system.

Safety assurance

- **Safety protection devices**: Install necessary safety protection devices on the electric hoist and truss, such as overload protection devices, limit switches, anti - fall devices, etc. The overload protection device can prevent the electric hoist from overloading operation, the limit switch can limit the travel range of the electric hoist, and the anti - fall device can prevent the hoisted object from falling in case of a malfunction of the electric hoist. - **Regular inspection and maintenance**: During the use process, regularly inspect and maintain the electric hoist and truss. Check whether the mechanical parts and electrical systems of the electric hoist are normal, and whether the rods of the truss are deformed or loose. Clean the dust, oil, and other debris on the electric hoist and truss in a timely manner, and replace the worn parts in a timely manner to ensure that the equipment is always in good operating condition.

- **Operator training**: Provide professional training to the operators who use the electric hoist and truss, so that they are familiar with the operation methods, safety precautions, and emergency handling measures of the equipment. Operators must strictly abide by the operating procedures, closely monitor the operation of the equipment during the operation process, and stop the machine in a timely manner when problems are found.