The following are the common steps and methods for the combined use of stage lifting slings and stage electric hoists:

Pre - operation Preparation

- **Confirm Load and Select Appropriate Equipment**：Determine the weight and dimensions of heavy objects such as stage equipment and props to be lifted. Based on this, select a stage electric hoist and a lifting sling with suitable load - bearing capacities. The rated load of the electric hoist should be greater than the weight of the heavy object. The lifting sling also needs to be selected with an appropriate tonnage, generally considering a certain safety factor, such as 1.2 times or more. - **Inspect the Equipment**：Before use, carefully check whether the mechanical components, electrical systems, braking devices, etc. of the electric hoist are in normal condition. Ensure that the hook, chain or wire rope, etc. have no wear, deformation, breakage, etc. At the same time, check whether the lifting sling has problems such as damage, tearing, aging, whether the surface is smooth, whether there are sharp burrs on the edges, and whether its loop eyes or end - connecting components are firm. Connection Operations - **Bind the Heavy Object**：According to the shape, structure and center - of - gravity position of the heavy object, choose an appropriate binding method to bind the heavy object with the lifting sling. A common method is the bottom - wrapping binding, that is, wrap the lifting sling around the bottom of the heavy object for one or more circles, and then arrange the loop eyes of the lifting sling well to ensure that the loop eyes can provide a stable connection point. For heavy objects with specific lifting points, the lifting sling can also be passed through or connected to these lifting points, and then tighten the lifting sling. - **Connect the Electric Hoist and the Lifting Sling**：Align the hook of the electric hoist with the loop eye of the lifting sling, and slowly lower the hook so that the loop eye of the lifting sling completely enters the inside of the hook of the electric hoist. Ensure that the hook can firmly hold the loop eye of the lifting sling. If necessary, devices such as safety lock catches can be used to further fix the hook and the loop eye of the lifting sling to prevent accidental unhooking. Lifting Operations - **Adjust the Position**：Start the control device of the electric hoist, slowly lift or move the heavy object, and adjust the position and height of the heavy object to make it reach the required position on the stage. During the lifting process, pay attention to observe whether the heavy object remains balanced, and whether the lifting sling has any looseness or displacement. - **Precise Positioning**：When the heavy object is close to the target position, slow down the running speed of the electric hoist and make precise adjustments to ensure that the heavy object is accurately placed at the predetermined position. During the entire lifting process, assign a dedicated person to observe the working status of the lifting sling and the electric hoist. If there is any abnormality, stop the operation immediately. Dismantling and Storage - **Dismantle the Connection**：After the lifting operation is completed, first lower the hook of the electric hoist to an appropriate position and release the connection between the hook and the loop eye of the lifting sling. Then untie the lifting sling from the heavy object, and be careful to avoid damage to the lifting sling due to friction or collision with the heavy object or other objects.

- **Storage and Arrangement**：Park the electric hoist in the designated position and turn off the power. Clean the lifting sling to remove dust, debris, etc. from its surface. Then fold or roll it up according to the specified method and store it in a dry and ventilated place, avoiding direct sunlight and humid environments to prevent the lifting sling from aging and corroding.

The matching effect of stage lifting slings and stage electric hoists can be affected by various factors. The following is a detailed analysis from the aspects of lifting slings, electric hoists, operation and use, and the environment: - **Regarding Lifting Slings**    - **Material and Strength**: Lifting slings are made of various materials, such as polyester and nylon. Different materials endow the slings with different strength, wear resistance, and corrosion resistance. If the material strength is insufficient and fails to match the lifting capacity of the electric hoist, there may be a risk of breakage, affecting the matching effect and lifting safety.    - **Length and Width**: The length determines the height range of lifting, while the width affects the contact area with the heavy object and the load - bearing capacity. If the length is inappropriate, it may be impossible to lift the heavy object to the required height. If the width is too narrow, the pressure per unit area will be too high, easily wearing the lifting sling and potentially causing the heavy object to be loosely bound.    - **Flexibility and Elasticity**: A lifting sling with good flexibility can better conform to the surface of the heavy object and disperse the pressure. However, excessive elasticity may cause the heavy object to sway during the lifting process, affecting the positioning accuracy. - **Regarding Electric Hoists**    - **Lifting Speed**: If the lifting speed is too fast, the impact force on the lifting sling will increase, and it may also be difficult to control the swing of the heavy object. If the speed is too slow, it will affect work efficiency.    - **Braking Performance**: The braking device of the electric hoist must be reliable. If the braking distance is too long or the braking is not sensitive, the heavy object may slide during the lifting process, subjecting the lifting sling to additional impact force and even triggering a safety accident.    - **Positioning Accuracy**: If the positioning accuracy of the electric hoist is not high, it will be difficult to place the heavy object accurately at the predetermined position. Repeated adjustments may be required, increasing the frequency and duration of the lifting sling's use and affecting the overall matching effect. - **Regarding Operation and Use**    - **Operator Skills and Experience**: The skill level and experience of the operator directly affect the lifting effect. A skilled operator can reasonably select the matching method of the lifting sling and the electric hoist according to the characteristics of the heavy object and the on - site environment, accurately operate the electric hoist, and control the speed and balance during the lifting process. Conversely, it may lead to a poor matching effect and even safety problems.    - **Lifting Plan**: A reasonable lifting plan is of great importance. It includes accurate judgment of the center of gravity of the heavy object, selection of lifting points, and planning of the lifting sequence. If the plan is unreasonable, it may cause uneven stress on the lifting sling and prevent the electric hoist from functioning effectively. - **Regarding the Environment**    - **Temperature and Humidity**: In a high - temperature environment, the material of the lifting sling may become soft, reducing its strength. In a low - temperature environment, it may become brittle, affecting its flexibility. A humid environment easily causes the lifting sling to mildew and corrode, and the electrical components of the electric hoist may also be affected by moisture, affecting their performance.    - **Space and Obstacles**: The size, shape of the stage space, and the presence of obstacles will affect the operating space and lifting path of the lifting sling and the electric hoist. In a narrow space or one with many obstacles, the lifting sling may rub against the obstacles, and the operation of the electric hoist will also be restricted.