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Classification of crane slings
Oct 13, 2017

The spreader mainly consists of chain spreader, clamp spreader, lifting chuck and so on. Summary:

The chain and chain sling ring, hook, sling and other accessories, is a metal sling, according to the bearing capacity is divided into 60 level 80 level sling, sling, sling and 100 120 level spreader. The higher the level, the higher the carrying capacity of the same chain.

Advantage:

1) high carrying capacity

2) safety, the breaking elongation rate is more than 20%

3) the combination of various forms, versatility, interchangeability strong

4) adjustable length and easy to store

5) long service life

6) use a wide range of temperature

7) easy to detect, convenient and quick

Shortcoming:

1) the price is higher than the sling and wire rope

2) self weight is too big

Hanging point

Hanging point refers to the fixed point on the object surface, lifting point for lifting heavy objects, according to the fixed form is divided into bolt type, welding type of two. Sling can be divided into various materials, mainly synthetic fiber sling.

Overview: Hoisting with synthetic fibers with high strength polyester (acid alkali not) or polypropylene (acid and alkali), polyamide (alkaline not acid) industrial strong filament as raw material, through industrial loom weaving or winding and core.

Advantage:

1: protect the hanging objects, so that the surface is not damaged

2: high strength, light, easy to carry and hoisting preparation work

3: soft and easy to operate

4: no corrosion, no electricity

Shortcoming:

1: it is easy to be cut by sharp angle in hoisting

2: not suitable for high temperature and high dust environment, the use of temperature are less than 100

3: low wear resistance

4: can not adjust the use of length overview: wire rope is by many or many strands of fine steel twisted into strands, and then by a certain number of strands twisted into spiral rope. In the material handling machinery, for lifting, traction, tension and load. There are two kinds of common rope cores: hemp core and steel core.

Advantage:

1: higher carrying capacity

2: light weight

3: the price is cheap

Shortcoming:

1: the surface is easy to wear and erosion, resulting in broken wire affecting load

2: hemp core temperature is low, not suitable for high temperature operation

3: no detour hoisting

4: detection inconvenience

5: stiff and difficult to store

6: unable to adjust the use length

5, non-standard spreader

In the hoisting process, the standard spreader can not meet all the hoisting requirements, so it is necessary to design non-standard spreader to achieve lifting. Pliers slings usually refer to clamps, used for clamping, fastening, or lifting tools.

Mechanical lever type slab clamp

Application: it is widely used in the steelmaking plant continuous casting workshop, hot rolling mill, slab yard and transportation station, freight yard, wharf slab handling and loading and unloading.

Categories: 1 according to the different ways of connection with the crane, it can be divided into single lifting lug type, double lifting lug type, double pulley block type, double pulley block guide barrel type.

2 according to the temperature of the slab being lifted, it can be divided into room temperature type and high temperature type.

Features: 1) without power supply, easy to use, can achieve free maintenance, reliable operation, safe and convenient.

2) for a general handling a number of blocks or blocks into a slab or cycle condition. Can design the number of adjustable, but not suitable for frequent changes in number of places.

3) the operation efficiency is relatively low.

Automatic lever clamp

Application: it is suitable for slab loading in steel plant.

Features: automatic lifting 1 block 2 block 1 block change, change number of hanging slab regularly transported constantly. At the same time, 1 slabs or 2 slabs can be fixed and lifted, and only a simple adjustment can be made.

Electric lever type slab clamp

Categories: 1 according to the different connection mode with the crane, it can be divided into double lug type, double pulley group type.

2 according to the temperature of the slab being lifted, it can be divided into room temperature type and high temperature type.

Application: it is widely used in the steelmaking plant continuous casting workshop, hot rolling mill, slab yard and transportation station, freight yard, wharf slab handling and loading and unloading.

Features: 1) mechanical gravity self-locking, safe and reliable use;

2) with clamping, limit limit, simple operation;

3) suitable for the handling of one or more slabs at a time;

4) the operation efficiency is higher than the mechanical automatic type;

5) the jaw opening and closing process has a high degree of change, the operation needs to have some experience, but can be connected with the lifting mechanism of the crane to complete the change of height compensation, to solve the height change problem.

Electric moving slab clamp

Application: it is widely used in the transportation, loading and unloading of the slab in the continuous casting workshop, hot rolling mill, slab warehouse and transportation station, steel yard and wharf of the iron and steel enterprise.

Features: 1) mechanical gravity self-locking, safe and reliable use; feature is the arm holding slab in clamped jaw, with the lifting arm along the road, the fixed inclined slide down, while holding the slab increasingly tight. Finally, the boom and the fixed arm become one. The heavier the slab is, the greater the clamping force is.

2) equipped with clamping, limit, the operation is simple and convenient; the transmission device for opening and closing the clamp, equipped with magnetic powder clutch and zero speed switch, when clamped slab, load increase magnetic powder clutch slip, when the output speed is zero, zero speed switch to detect the signal lights, clamping.

3) suitable for the handling of once and at most slabs. For the 94t clamp, the 1~4 block can be clamped, and the cam switch is detected by the height detector.

4) the operation efficiency is relatively highest. It can be made into automatic control of slab clamp. For example, hot rolling mill roller feeding.

5) the cost is relatively high, maintenance is relatively complex. Increase the electric control system and a cable reel; increasing the transmission equipment, motor, reducer, clutch, electromagnetic brake; increase the detection device and equipment, such as clamping opening detection, detection, position detection, high detection limit travel.

6) computer management of slab library can be realized.

Automatic lever type billet clamp

Application: it is widely used in the billet handling and loading and unloading of the continuous casting workshop, the hot rolling stock warehouse and the transportation station of the iron and steel metallurgy enterprise, the billet warehouse and the transportation station of the steel smelting enterprise.

Categories: 1 according to the different connection mode with the crane, it can be divided into single hanging point type, double hanging point type, single and double general lifting point type.

2 according to the temperature of the square billet being lifted, it can be divided into room temperature type and high temperature type.

Features: 1) no power supply, no ground manual assistance, only the driver can directly control the lifting operation; easy to use, can achieve maintenance free, safe and reliable operation.

2) generally suitable for handling one or more square billet at one time.

3) higher efficiency.

Mechanical lever type vertical coil clamp

Application: widely used in cold rolling mill train back, finished workshop filing lifting. Handling and transportation also applies to the station, yard, pier and large user filing filing.

Features: 1) with the lifting of the crane hook, automatic opening and closing of the jaw, mechanical gravity self-locking, easy to use, safe and reliable.

2) a floating support plate is installed at the end of the steel coil to ensure that the end of the coil is not damaged. For a thin plate (3~0.3mm) cold filing lifting.

3) are not suitable for thickness less than 0.3mm on annealing (Gui Gangjuan), caused by the bending deformation.

Lever type clamping and vertical coil clamp

Application: it is widely used in the finished product workshop and heat treatment workshop of cold rolled silicon steel sheet factory, and is also suitable for the finished product workshop of cold rolling strip steel plant.

Features: 1) with the lifting of the crane hook, automatic opening and closing of the jaw, mechanical gravity self-locking, easy to use, safe and reliable;

2) clamp the steel coil inside the outer clamping way, the lifting force is balanced, and it will not cause the deformation of the coil;

3) to ensure the constant center of gravity lifting and lowering steel coil, will not cause damage to the end of steel coil.

4) the size of the expansion is relatively short, but the size of the shape length is larger, and the manufacturing cost is relatively high.

5) especially suitable for the lifting of steel coils with a thickness of less than 0.5mm.

Electric translational horizontal roll lifting pliers

Application: widely used in cold rolling mill, especially for automobile. It is also suitable for handling and loading of raw steel coil in car factory and electric appliance factory.

Features: 1) automatic detection and control system equipped with the clamping, photoelectric detection and load, limit state induction detection and automatic control function, and set the display lights display the state of operation is safe and convenient.

2) with power off self-locking, load self-locking, transmission chain torque protection, to ensure that the sling is absolutely safe and reliable.

3) floating contact steel coil end face device, polyurethane jaw protection and introduction protection, to ensure that the coil does not cause any damage.

4) the system rigidity is poor, and it is not suitable for the hot rolling of high temperature coil.

Electric lever type horizontal roll lifting pliers

Type: according to the temperature of the hanging steel coil is divided into: normal temperature type, high temperature type.

Use: widely used in metallurgical enterprises is also suitable for the hot strip mill, station, wharf, large yard, hot rolled steel coil user horizontal roll lifting.

Features: 1) the system lubrication effect is good, can realize self lubrication, maintenance is simple and convenient

2) compact structure and minimum width size.

3) the height size is relatively high.

Mechanical lever type horizontal roll lifting pliers

Use: suitable for the station, freight yard, wharf and other occasions of horizontal coil lifting.

Features: 1) no power supply, wide range of applications, especially outdoor occasions.

2) use requirements, high level of operation.

3) the outer diameter of steel coil can not be changed too much.

4) the operation efficiency is relatively low.

Hydraulic lever type horizontal roll lifting pliers

Use: widely used in metallurgical enterprises is also suitable for the hot strip mill, station, wharf, large yard, hot rolled steel coil user horizontal roll lifting.

Features: compared with the electric lever type horizontal roll, it has the following characteristics

1) system flexibility is good, opening and closing speed is fast, operation efficiency is high.

2) not suitable for high temperature steel coil, the cost is relatively high.

3) maintenance is high, hydraulic system prone to oil seepage phenomenon.

Horizontal roll C hook spreader

Classification: 1) according to the different sections of Leptospira divided into structure, type, type, type of box beam.

2) according to the type of hook lining plate, it can be divided into copper lining plate, aluminum lining plate and polyurethane lining plate.

Use: widely used in cold rolling mill of hot strip mill, steel belt, also applies to the station, warehouse, wharf, large steel coil lifting all kinds of horizontal coil users.

Features: 1) low cost and convenient maintenance.

2) limit the stacking space or lifting sequence of steel coils.

3) the operation efficiency is relatively low.

Electric translational plate stacking lifting tongs

Application: widely used in hot rolling production line, for board stacking handling and loading and unloading vehicles.

Features: 1) the horizontal distance of each leg can be adjusted electrically, and it is easy to use. It is especially suitable for the plate with longer hanging plate, so that the steel plate can not be deformed because of lifting.

2) the structure is larger and the cost is higher.

Automatic lever lifting pliers

Application: it is suitable for the loading and unloading of wide thick plate in rolling mill, wharf and station freight yard of metallurgical enterprise..

Features: 1) compared with the electric translational plate spreader advantages are: lighter weight, the use of environmental conditions is not limited, low cost, simple maintenance, especially suitable for the occasion of big plate width (plate width variation up to 1.5m~4.8m). The disadvantage: the lifting plate number and thickness can not change frequently, adjust relatively trouble.

2) compared with the electric disk sling, the self weight is relatively light, the cost is low, the maintenance is simple and convenient, and the safety factor is high, especially at the time of loading. The disadvantages of lifting steel blocks and plate thickness can not change frequently, adjust relatively trouble. The English name is hoisting suctorial cup.

Sling for drawing heavy objects by magnetic force or air pressure difference. It is divided into two kinds: electromagnetic sucker and vacuum sucker.

Electromagnetic chuck:

It consists of a disk shaped steel shell and an exciting coil inside the shell (Fig. 1), which is used for absorbing the magnetic material, also called lifting electromagnet, which is usually hung on the crane hook, and the cable rises and falls along with the hook. According to the working principle can be divided into electromagnetic and permanent magnet. The electromagnetic coil is energized by coil and DC, and the magnetic discharge is removed by power off. In order to prevent the material from falling during the power failure, the crane with this sucker usually needs an emergency power supply. Permanent magnet type depends on the permanent magnet (such as aluminum nickel cobalt or strontium ferrite magnetic suction head) suction, electric discharge power degaussing, no hazardous materials fall, but not easy to clean in degaussing adsorption iron oxide skin suction effect. Round electromagnetic sucker is used most. Rectangular electromagnetic chucks are often used when drawing plates and strips. The bottom of the suction cup is mostly flat and concave, which is used to absorb the barrel and the coil. When you transport long articles, you can use several suckers at the same time. The material temperature absorbed by the electromagnetic chuck is generally no more than 600 degrees centigrade.

Vacuum chuck:

It consists of a vacuum device and a soft plastic or a bowl shaped rubber sucker, which is divided into two types: power and unpowered. Powered vacuum suction pump uses vacuum pump to obtain vacuum, suction larger, but there is noise, and need to be accompanied by cable or ventilation hose. No power vacuum sucker also called self suction vacuum sucker, sucker in filed by hook driven piston rod for vacuum, does not need the power source, has the advantages of simple structure, no noise, but usually only absorb 500 kg of material. Vacuum suction is used to draw smooth surface objects, the sucked material without magnetic limit, steel, glass, plastic, wood and cement products are absorbing, and from a stack of sheets on each material, high work efficiency.


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