1. When selecting the
rigging specifications, the size, weight, shape of the load to be lifted, and the hoisting method to be used must be included in the calculation considerations, and the requirements for the ultimate working force must be included in the calculation. The working environment and the type of load must be considered. The slings of the proper length must be selected that have sufficient capacity and can meet the usage method. If multiple slings are used for lifting loads at the same time, the same type of slings must be selected; the raw materials of flat slings cannot be affected by the environment Load impact. Regardless of whether attachments or soft lifting eyes are needed, careful consideration must be given to matching the end of the sling with auxiliary attachments and lifting equipment.
2. Restricted use angle of the sling. When using a flat sling with soft ears, the minimum length of the ear should not be less than 3.5 times the maximum thickness of the hook in the contact part of the ear, and the angle of the lifting ear cannot exceed 20° . When connecting a sling with soft lifting lugs and lifting gear, the contact part of the sling and lifting gear must be constant, unless the axial width of the sling does not exceed 75mm, and the bending radius of the lifting accessory must be at least the sling 0.75 times the axial width. For example: the radius of the sling on the cargo hook is at least 0.75 times the axial width of the sling. The width of the fabric may be affected by the radius of the inner part of the cargo hook, and the effect of the curvature of the cargo hook hinders the balanced effect of the strength on the width of the fabric. The sling is strictly prohibited from overloading, and the correct method coefficient must be used. Part of the limit working force method may have been given on the label. Multiple combined slings cannot exceed the maximum angle to the vertical.
3. Follow good hoisting experience. Plan the hoisting and light operation plan before starting hoisting.
4. When hoisting, use the sling connection method correctly. The sling should be correctly placed and connected to the load in a safe way. The sling must be placed on the load so that the load can be balanced. The width of the sling; never knotted. Or twist the sling stitching part can not be placed on the hook or lifting equipment, and always placed on the upright part of the sling, to prevent tag damage by staying away from the load, hook and locking angle.
5. Precautions for the use of multiple combination slings. The evaluation of the ultimate working force of multiple combination slings is determined by the symmetry of the combined slings to bear the load, that is, when lifting, the branches of the slings are distributed symmetrically and evenly according to the design, with the same Vertical angle. 3 Combination sling, if the branch cannot be uniformly loaded according to the design, the maximum strength is on a branch, it will be the sum of the maximum bearing capacity of the adjacent branch at the design angle, the same result is in the 4 combination sling, if it is not a rigid load , Will also be counted. Note: For rigid loads, most of the gravity may be borne by three or even two of them, and the remaining one only protects the balance of the load
6. When hoisting, the protection sling of the sling should be kept away from sharp edges, friction and wear, whether it is away from the load or lifting equipment, the appropriate part of the sling should be strengthened and protected from sharp edges and abrasion, and additional necessary It is necessary to strengthen protection and supplement.
7. To ensure that the load is balanced during the lifting process, the sling must be used in a safe manner, and the load must not be tilted or slipped from the sling; the sling must be arranged directly above the center of gravity of the load and the lifting point, Make the load balanced and stable. If the center of gravity of the load is not below the lifting point, the sling in motion may cross the lifting point. Cause danger.
8. The hoisting method adopted by the sling can ensure the safety of the load if a basket hoist is used, because there is no locking behavior like a lock hoist, and the sling can be flipped through the lifting point. It is recommended to use two slings together. The suspension of the limbs is as vertical as possible, which helps to ensure that the load is equally shared between the branches. When the flat sling is locked, it should be allowed to be placed at a natural angle (120°), so as to avoid heat due to friction. The sling is neither in a strong forcing position nor trying to create a tight grip. The correct safety method Double lock hanging with one sling. The double lock sling ensures safety and prevents the load from slipping off the sling.
9. Ensure personnel safety During the hoisting process, pay close attention to ensure personnel safety. Personnel in a dangerous state must be warned, and if necessary, immediately evacuate from the dangerous zone. The hands or other parts of the body must be kept away from the sling to prevent injury when the sling is loose.
10. During the hoisting process, an exemplary method must be used for hoisting. Exemplary hoisting must be used. The sling is lifted loosely until the sling is tightened, and the load is gradually lifted to a predetermined position. It is especially important that it is lifted in a basket or Friction bears the load when tensioning freely.
11. Control the rotation of the load. If the load tends to incline, the lifting object must be lowered to ensure that the load is restrained and to prevent accidental rotation of the load.
12. Avoid collision, drag, pull, friction, and vibration of the
rigging, and prevent damage to the rigging. When hoisting, care must be taken to ensure that the load is restrained to prevent accidental overturning or collision with other objects. Avoid dragging, pulling or oscillating the load, as that will increase the force on the
rigging. If the rigging is under load, or the load is pressed on the
rigging, the sling should not be dragged on the ground or rough surface.
13. The landing of the
rigging. When hoisting, the load will drop under equal restraint.
14. The correct storage of the sling When the sling is finished lifting operation, it must be put back and stored correctly; if it is no longer used, the sling must be stored in a clean, dry, well-ventilated condition, at room temperature, and placed On the shelf, keep away from heat, gas that can corrode the surface, chemicals, direct sunlight or other strong ultraviolet rays. Priority is given to the use of stored items. Any damage to the sling during use must be checked, and the damaged sling must not be stored. When lifting, the sling is contaminated by acid and alkali. Dilute it with water or neutralize it with the corresponding media recommended for storage in advance. Based on the reference of the lifting sling material and related chemical properties, recommendations from the supplier, products that have been used without problems may be necessary. The sling becomes wet during use, or due to cleaning, it will be hung up and allowed to dry naturally.
