Why do lifting hooks often rotate during use?
During hoisting, the hook often rotates. When the lifted weight is lifted, the hook will rotate, and the wire rope hanging between the hook and the pulley block on the top of the boom will twist. The lifted weight will rotate together with the hook. At this time, it is no longer possible to continue to lift or put down the lifted weight. Hook rotation seriously affects the normal progress of hoisting operations, seriously threatens the safety of workers and equipment, and must be prevented.
The causes of hook rotation include internal and external causes of the crane, and the internal cause of hook rotation is the fundamental cause.
Regardless of the model, specification, or grade of the steel wire rope used in the crane, force will be generated when it is stressed. This is due to the way the steel wire rope is manufactured. The steel wire rope is first spirally twisted into one strand, and then several strands are spirally twisted into one strand. After being stressed, the wire and strands will be straightened, but during the lifting course, the end of the wire rope is fixed and the presence of a moment causes the hook assembly to tend to rotate.
But on the other hand, there are also many external factors that directly cause the hook to rotate. For example, during the hoisting process, external forces such as manpower or wind force push the hook to rotate and the animal swings, and the hook insertion method causes the hook to be unbalanced, etc.
The rotation of the hook is related to the following factors:
1. The larger the crane, the higher the lifting height, that is, the longer the length of the wire rope between the boom top pulley group and the hook, the greater the possibility of the hook rotating.
2. It is easier for the hook to rotate when the hook wire rope is wound into an odd array than a double array. The smaller the number of matching wire ropes, the easier it is for the hook to rotate.
3. The greater the weight of a single wire rope, the more likely it is that the hook will rotate.
4. The smaller the shape and size of the hook assembly and the size of the pulley, the more likely it is that the hook will rotate;
The speed of operating the lifting hook of the crane is unstable, especially when the heavy hook lifts off the ground, the possibility of rotation increases.
5. The speed of operating the lifting hook of the crane is unstable, especially when the heavier hook is off the ground, it is more likely to rotate.
During hoisting, the hook often rotates. When the lifted weight is lifted, the hook will rotate, and the wire rope hanging between the hook and the pulley block on the top of the boom will twist. The lifted weight will rotate together with the hook. At this time, it is no longer possible to continue to lift or put down the lifted weight. Hook rotation seriously affects the normal progress of hoisting operations, seriously threatens the safety of workers and equipment, and must be prevented.
The causes of hook rotation include internal and external causes of the crane, and the internal cause of hook rotation is the fundamental cause.
Regardless of the model, specification, or grade of the steel wire rope used in the crane, force will be generated when it is stressed. This is due to the way the steel wire rope is manufactured. The steel wire rope is first spirally twisted into one strand, and then several strands are spirally twisted into one strand. After being stressed, the wire and strands will be straightened, but during the lifting course, the end of the wire rope is fixed and the presence of a moment causes the hook assembly to tend to rotate.
But on the other hand, there are also many external factors that directly cause the hook to rotate. For example, during the hoisting process, external forces such as manpower or wind force push the hook to rotate and the animal swings, and the hook insertion method causes the hook to be unbalanced, etc.
The rotation of the hook is related to the following factors:
1. The larger the crane, the higher the lifting height, that is, the longer the length of the wire rope between the boom top pulley group and the hook, the greater the possibility of the hook rotating.
2. It is easier for the hook to rotate when the hook wire rope is wound into an odd array than a double array. The smaller the number of matching wire ropes, the easier it is for the hook to rotate.
3. The greater the weight of a single wire rope, the more likely it is that the hook will rotate.
4. The smaller the shape and size of the hook assembly and the size of the pulley, the more likely it is that the hook will rotate;
The speed of operating the lifting hook of the crane is unstable, especially when the heavy hook lifts off the ground, the possibility of rotation increases.
5. The speed of operating the lifting hook of the crane is unstable, especially when the heavier hook is off the ground, it is more likely to rotate.
During hoisting, the hook often rotates. When the lifted weight is lifted, the hook will rotate, and the wire rope hanging between the hook and the pulley block on the top of the boom will twist. The lifted weight will rotate together with the hook. At this time, it is no longer possible to continue to lift or put down the lifted weight. Hook rotation seriously affects the normal progress of hoisting operations, seriously threatens the safety of workers and equipment, and must be prevented.
The causes of hook rotation include internal and external causes of the crane, and the internal cause of hook rotation is the fundamental cause.
Regardless of the model, specification, or grade of the steel wire rope used in the crane, force will be generated when it is stressed. This is due to the way the steel wire rope is manufactured. The steel wire rope is first spirally twisted into one strand, and then several strands are spirally twisted into one strand. After being stressed, the wire and strands will be straightened, but during the lifting course, the end of the wire rope is fixed and the presence of a moment causes the hook assembly to tend to rotate.
But on the other hand, there are also many external factors that directly cause the hook to rotate. For example, during the hoisting process, external forces such as manpower or wind force push the hook to rotate and the animal swings, and the hook insertion method causes the hook to be unbalanced, etc.
The rotation of the hook is related to the following factors:
1. The larger the crane, the higher the lifting height, that is, the longer the length of the wire rope between the boom top pulley group and the hook, the greater the possibility of the hook rotating.
2. It is easier for the hook to rotate when the hook wire rope is wound into an odd array than a double array. The smaller the number of matching wire ropes, the easier it is for the hook to rotate.
3. The greater the weight of a single wire rope, the more likely it is that the hook will rotate.
4. The smaller the shape and size of the hook assembly and the size of the pulley, the more likely it is that the hook will rotate;
The speed of operating the lifting hook of the crane is unstable, especially when the heavy hook lifts off the ground, the possibility of rotation increases.
5. The speed of operating the lifting hook of the crane is unstable, especially when the heavier hook is off the ground, it is more likely to rotate.
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