How to avoid wear and tear of hooks and replace them in time
crane hook is a very important component in lifting equipment. All work of lifting heavy objects depends on it to complete. Since the weight of lifting heavy objects sometimes exceeds the limit requirements, the hook will wear or break, which is very dangerous. So what is the use of crane hook? How can it be avoided? Let’s learn about it together.
The hook serves as connecting the crane and heavy objects, and its maintenance must be paid attention to. For this reason, the lifting height limiter or hook locking device of the hook is ineffective or damaged, and the leader should be held accountable.
The hook can be divided into two types according to its shape: single hook and double hook; it can also be divided into three types: piece hook and forged hook and cast hook according to its manufacturing process. At present, common hooks are forged single hooks. Cast hooks are not allowed to be used on cranes to widely manufacture low-carbon steel and carbon alloy steel to solve the problem of crack resistance.
In order to ensure safety, the hook must be inspected and should be scrapped immediately when any of the following situations are found.
① Cracks appeared.
② The wear amount of the dangerous section is as high as 5% of the original height according to the hook manufactured by GB10051.2; the hook manufactured by the standard shall be greater than 10% of the original size.
③The opening degree increases by 15% compared to the original one.
④Torsion deformation exceeds 10 degrees.
⑤Plastic deformation occurs in hazardous sections or hook necks.
⑥ When the wear of the board hook bushing reaches 50% of the original size, the core sleeve should be scrapped.
⑦ When the wear of the plate hook mandrel reaches 5% of the original size, the mandrel should be scrapped.
Another thing to note is that the above defects of the hook must not be welded.
The main method of inspection is generally to use visual inspection, that is, to observe carefully with a magnifying glass. If necessary, coloring can be used or flaw detection can be performed. The wear amount of dangerous sections can be measured with a caliper or a caliper; the opening degree is to compare the size measured by the caliper with the original size or the opening degree of the standard hook. Here is a simple and applicable method: when the new crane hook is just activated, a small hole is punched out on both sides of the hook body opening, measure the distance between the two holes and record it on the record. It is used to compare and compare with the size of the hook after deformation in the future to determine the size of the opening degree. Torsion deformation can be visually measured or measured on the side of the steel ruler. If it is required to be accurate, you can use a marking ruler to detect it on the platform. Items ⑤, ⑥, and ⑦ can all be visually tested or detected with calipers.
From years of maintenance and supervision and inspection of car cranes, it was found that the hooks of car cranes are very worn during operation (this wear refers to the wear of car cranes during the process from the garage to the work site or transfer between various work sites in order to complete various loading and unloading tasks). Among them, the cranes of 5t, 7t, 8t and 10t are used.The hooks are worn seriously because the driver of these tonnage car cranes always locks the hook in front of the cab with a wire rope, and the two ends of the locking wire rope are hung in the two front traction hooks on the front bumper of the crane's chassis.
When the crane is transferred, the special issue is that when operating under poor internal conditions of the work site, it will cause more purpose friction between the wire rope and the hook, causing wear between the hook and the wire rope. Because the two ends of the wire rope are hung on the pull hooks on both sides, the wire rope is like a string of a huqin, which wears the vertical dangerous section of the hook very badly. In the case of bad road conditions, for example, the hooks of the power department's car cranes are particularly worn when operating in the field. Sometimes they have to replace a wire rope that locks the hooks in a few months. This wear of the hook is non-working wear. The three methods to reduce and prevent this wear are as follows:
(1) Increase the lock hook wire rope to 3
Take a wire rope about 4.2m long and fasten it with ropes at both ends. This changes the contact between the wire rope and the hook from 1 to 3, increasing the contact area between the wire rope and the hook, reducing the friction and wear between them, solving the problem that one wire rope is easy to cut into the surface of the hook, extending the life of the hook and rigging, and extending the life of the locking hook wire rope.
(2) Set steel pipes on a single wire rope
Please take a piece of steel pipe with a length of 400mm and a diameter of 25.4mm, bend it into a shape as shown in Figure 2, and just put it on the wire rope. During the operation of a car crane, since the wire rope does not come into direct contact with the hook surface, the casing plays a role in protecting the hook. The casing can also be made of other materials, such as thick rubber pipes, high-pressure hoses with wire mesh, etc.
(3) Use other materials to replace wire ropes
If you use nylon ropes or nylon hoisting belts on marine ships to replace wire ropes, the effect will be very good. In addition, it is recommended that the length of the lock hook wire rope L L be 1.35-1.45m. After many tests, we have found that if the wire rope is too long, the hook will be hung high, which will affect the driver's field of vision; if the wire rope is too short, it will be inconvenient to hook, which will easily cause the person who is hooking to sprain. Generally speaking, if the driver has a higher figure, he will take a larger value, and if the driver has a smaller value. This makes the work convenient and can take into account the driver's vision needs.
Crane hook is a very important component in lifting equipment. All work of lifting heavy objects depends on it to complete. Since the weight of lifting heavy objects sometimes exceeds the limit requirements, the hook will wear or break, which is very dangerous. So what is the use of crane hook? How can it be avoided? Let’s learn about it together.
The hook serves as connecting the crane and heavy objects, and its maintenance must be paid attention to. For this reason, the lifting height limiter or hook locking device of the hook is ineffective or damaged, and the leader should be held accountable.
The hook can be divided into two types according to its shape: single hook and double hook; it can also be divided into three types: piece hook and forged hook and cast hook according to its manufacturing process. At present, common hooks are forged single hooks. Cast hooks are not allowed to be used on cranes to widely manufacture low-carbon steel and carbon alloy steel to solve the problem of crack resistance.
In order to ensure safety, the hook must be inspected and should be scrapped immediately when any of the following situations are found.
① Cracks appeared.
② The wear amount of the dangerous section is as high as 5% of the original height according to the hook manufactured by GB10051.2; the hook manufactured by the standard shall be greater than 10% of the original size.
③The opening degree increases by 15% compared to the original one.
④Torsion deformation exceeds 10 degrees.
⑤Plastic deformation occurs in hazardous sections or hook necks.
⑥ When the wear of the board hook bushing reaches 50% of the original size, the core sleeve should be scrapped.
⑦ When the wear of the plate hook mandrel reaches 5% of the original size, the mandrel should be scrapped.
Another thing to note is that the above defects of the hook must not be welded.
The main method of inspection is generally to use visual inspection, that is, to observe carefully with a magnifying glass. If necessary, coloring can be used or flaw detection can be performed. The wear amount of dangerous sections can be measured with a caliper or a caliper; the opening degree is to compare the size measured by the caliper with the original size or the opening degree of the standard hook. Here is a simple and applicable method: when the new crane hook is just activated, a small hole is punched out on both sides of the hook body opening, measure the distance between the two holes and record it on the record. It is used to compare and compare with the size of the hook after deformation in the future to determine the size of the opening degree. Torsion deformation can be visually measured or measured on the side of the steel ruler. If it is required to be accurate, you can use a marking ruler to detect it on the platform. Items ⑤, ⑥, and ⑦ can all be visually tested or detected with calipers.
From years of maintenance and supervision and inspection of car cranes, it was found that the hooks of car cranes are very worn during operation (this wear refers to the wear of car cranes during the process from the garage to the work site or transfer between various work sites in order to complete various loading and unloading tasks). Among them, the cranes of 5t, 7t, 8t and 10t are used.The hooks are worn seriously because the driver of these tonnage car cranes always locks the hook in front of the cab with a wire rope, and the two ends of the locking wire rope are hung in the two front traction hooks on the front bumper of the crane's chassis.
When the crane is transferred, the special issue is that when operating under poor internal conditions of the work site, it will cause more purpose friction between the wire rope and the hook, causing wear between the hook and the wire rope. Because the two ends of the wire rope are hung on the pull hooks on both sides, the wire rope is like a string of a huqin, which wears the vertical dangerous section of the hook very badly. In the case of bad road conditions, for example, the hooks of the power department's car cranes are particularly worn when operating in the field. Sometimes they have to replace a wire rope that locks the hooks in a few months. This wear of the hook is non-working wear. The three methods to reduce and prevent this wear are as follows:
(1) Increase the lock hook wire rope to 3
Take a wire rope about 4.2m long and fasten it with ropes at both ends. This changes the contact between the wire rope and the hook from 1 to 3, increasing the contact area between the wire rope and the hook, reducing the friction and wear between them, solving the problem that one wire rope is easy to cut into the surface of the hook, extending the life of the hook and rigging, and extending the life of the locking hook wire rope.
(2) Set steel pipes on a single wire rope
Please take a piece of steel pipe with a length of 400mm and a diameter of 25.4mm, bend it into a shape as shown in Figure 2, and just put it on the wire rope. During the operation of a car crane, since the wire rope does not come into direct contact with the hook surface, the casing plays a role in protecting the hook. The casing can also be made of other materials, such as thick rubber pipes, high-pressure hoses with wire mesh, etc.
(3) Use other materials to replace wire ropes
If you use nylon ropes or nylon hoisting belts on marine ships to replace wire ropes, the effect will be very good. In addition, it is recommended that the length of the lock hook wire rope L L be 1.35-1.45m. After many tests, we have found that if the wire rope is too long, the hook will be hung high, which will affect the driver's field of vision; if the wire rope is too short, it will be inconvenient to hook, which will easily cause the person who is hooking to sprain. Generally speaking, if the driver has a higher figure, he will take a larger value, and if the driver has a smaller value. This makes the work convenient and can take into account the driver's vision needs.
Crane hook is a very important component in lifting equipment. All work of lifting heavy objects depends on it to complete. Since the weight of lifting heavy objects sometimes exceeds the limit requirements, the hook will wear or break, which is very dangerous. So what is the use of crane hook? How can it be avoided? Let’s learn about it together.
The hook serves as connecting the crane and heavy objects, and its maintenance must be paid attention to. For this reason, the lifting height limiter or hook locking device of the hook is ineffective or damaged, and the leader should be held accountable.
The hook can be divided into two types according to its shape: single hook and double hook; it can also be divided into three types: piece hook and forged hook and cast hook according to its manufacturing process. At present, common hooks are forged single hooks. Cast hooks are not allowed to be used on cranes to widely manufacture low-carbon steel and carbon alloy steel to solve the problem of crack resistance.
In order to ensure safety, the hook must be inspected and should be scrapped immediately when any of the following situations are found.
① Cracks appeared.
② The wear amount of the dangerous section is as high as 5% of the original height according to the hook manufactured by GB10051.2; the hook manufactured by the standard shall be greater than 10% of the original size.
③The opening degree increases by 15% compared to the original one.
④Torsion deformation exceeds 10 degrees.
⑤Plastic deformation occurs in hazardous sections or hook necks.
⑥ When the wear of the board hook bushing reaches 50% of the original size, the core sleeve should be scrapped.
⑦ When the wear of the plate hook mandrel reaches 5% of the original size, the mandrel should be scrapped.
Another thing to note is that the above defects of the hook must not be welded.
The main method of inspection is generally to use visual inspection, that is, to observe carefully with a magnifying glass. If necessary, coloring can be used or flaw detection can be performed. The wear amount of dangerous sections can be measured with a caliper or a caliper; the opening degree is to compare the size measured by the caliper with the original size or the opening degree of the standard hook. Here is a simple and applicable method: when the new crane hook is just activated, a small hole is punched out on both sides of the hook body opening, measure the distance between the two holes and record it on the record. It is used to compare and compare with the size of the hook after deformation in the future to determine the size of the opening degree. Torsion deformation can be visually measured or measured on the side of the steel ruler. If it is required to be accurate, you can use a marking ruler to detect it on the platform. Items ⑤, ⑥, and ⑦ can all be visually tested or detected with calipers.
From years of maintenance and supervision and inspection of car cranes, it was found that the hooks of car cranes are very worn during operation (this wear refers to the wear of car cranes during the process from the garage to the work site or transfer between various work sites in order to complete various loading and unloading tasks). Among them, the cranes of 5t, 7t, 8t and 10t are used.The hooks are worn seriously because the driver of these tonnage car cranes always locks the hook in front of the cab with a wire rope, and the two ends of the locking wire rope are hung in the two front traction hooks on the front bumper of the crane's chassis.
When the crane is transferred, the special issue is that when operating under poor internal conditions of the work site, it will cause more purpose friction between the wire rope and the hook, causing wear between the hook and the wire rope. Because the two ends of the wire rope are hung on the pull hooks on both sides, the wire rope is like a string of a huqin, which wears the vertical dangerous section of the hook very badly. In the case of bad road conditions, for example, the hooks of the power department's car cranes are particularly worn when operating in the field. Sometimes they have to replace a wire rope that locks the hooks in a few months. This wear of the hook is non-working wear. The three methods to reduce and prevent this wear are as follows:
(1) Increase the lock hook wire rope to 3
Take a wire rope about 4.2m long and fasten it with ropes at both ends. This changes the contact between the wire rope and the hook from 1 to 3, increasing the contact area between the wire rope and the hook, reducing the friction and wear between them, solving the problem that one wire rope is easy to cut into the surface of the hook, extending the life of the hook and rigging, and extending the life of the locking hook wire rope.
(2) Set steel pipes on a single wire rope
Please take a piece of steel pipe with a length of 400mm and a diameter of 25.4mm, bend it into a shape as shown in Figure 2, and just put it on the wire rope. During the operation of a car crane, since the wire rope does not come into direct contact with the hook surface, the casing plays a role in protecting the hook. The casing can also be made of other materials, such as thick rubber pipes, high-pressure hoses with wire mesh, etc.
(3) Use other materials to replace wire ropes
If you use nylon ropes or nylon hoisting belts on marine ships to replace wire ropes, the effect will be very good. In addition, it is recommended that the length of the lock hook wire rope L L be 1.35-1.45m. After many tests, we have found that if the wire rope is too long, the hook will be hung high, which will affect the driver's field of vision; if the wire rope is too short, it will be inconvenient to hook, which will easily cause the person who is hooking to sprain. Generally speaking, if the driver has a higher figure, he will take a larger value, and if the driver has a smaller value. This makes the work convenient and can take into account the driver's vision needs.
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