What products are included in the sling? What are the types of slings?

Rigging: A general term for the connecting tools necessary to lift or move objects. Self-brown rope:

Rope made from the plant fiber agave hemp. Steel wire rope rigging: high-strength and high-quality carbon steel wire is made into steel wire strands through cold drawing and heat treatment processes, and then several strands are twisted into a rope around a core.

Sling (jack rope): the use of wire rope (generally should be used 6 37) to make a certain length according to the need, the two ends are inserted into a circular shape as required, so as to facilitate the binding of heavy objects or hoisting parts. Wire rope clamp (wire clip):

A clamp used to clamp the end of a wire rope or connect two wire ropes, and the fastness of its connection can be fastened with threads. Chain: A loop made of metal and connected to each other in the form of a rope.

Elastic bolt (flower basket bolt tensioner): a kind of rigging that uses threads to adjust the tightness effect and make the wire rope meet the tightness requirements. Open rigging screw buckle (flower basket screw):

Two bolts and connecting rods are composed of two opposite spirals, which are used to adjust the tightness of the rigging. Spreader: a general term for the tools required for hoisting.

Metal slings: metal slings mainly include: wire rope slings, chain slings, lifting belt slings, shackles, hooks, slings (clamps), magnetic spreaders, etc.

Slings synthetic fiber slings, synthetic fiber slings mainly include: ropes and belt slings made of nylon, polypropylene, polyester, and high-strength and high-modulus polyethylene fibers. In mechanical and electrical engineering lifting technology, slings mainly include:

Wire ropes, pulley blocks, winches and balance beams. When selecting the sling specifications, the size, weight, shape of the load to be lifted, and the use coefficient of the common influence of the hoisting method to be adopted must be included in the calculation consideration, and the requirements of the ultimate working force given, while the working environment and the type of load must be considered. It is necessary to choose a sling of the appropriate length that has sufficient capacity and can meet the use of the mode, and if multiple slings are used to lift the load at the same time, the same type of sling must be selected; The raw material of the flat sling must not be affected by the environment or load.

Regardless of whether attachments or soft lifting lugs are required, careful consideration must be given to matching the end of the sling with auxiliary attachments and lifting equipment. <>

Wire rope rigging hoisting Note: If it is a single-leg hoisting belt, the rigging point must be located vertically above the center of gravity of the hoisted object. If it is hoisted with two legs, the hanging points should be located on both sides of the cargo, and the hook should be above the center of gravity of the object to be lifted.

If it is a three-legged or four-legged hoisting, the hanging point must be evenly located on the plane around the goods, and the hook is located directly above the center of gravity of the hoisted object. Safety factor 4:

1. The specific one is 5:1 or 6:1, and it should be used within the safety factor.

Chain rigging hoisting Note: the chain is not allowed to be knotted or twisted during use, can not be loaded with the tip of the hook, the normal working temperature of the chain rigging is -40 degrees to +200 degrees, the single-leg rigging, the lifting point should be located vertically above the center of gravity of the lifting object If it is a double-legged rigging, the hanging point should be located on both sides of the lifting object, the lifting point is above the center of gravity, if it is a three-legged and four-legged rigging, the hanging point should be evenly located on the level of the center of gravity of the lifting object, and above the center of gravity of the lifting object. <>

With the development of slings, China has entered the era of industrial production of slings. Slings are auxiliary application materials for production and construction, and the development of the sling market is closely related to economic development. Before November 2008, due to the rapid development of the economy, China's economy is advancing by leaps and bounds, therefore, China's sling development is very rapid, both exports and domestic sales have reached the peak of history.

However, the world financial crisis in September 2008 has begun to affect the real economy from November 2008, and the export side is reflected in foreign demand, especially chemical fiber lifting belts and transportation bolts, which have decreased sharply. In addition, due to the sharp appreciation of the renminbi against foreign currencies such as the euro, which has greatly reduced the competitiveness of China's rigging exports, some previously booked foreign orders, due to the sharp appreciation of the renminbi against some foreign currencies, began to suffer large losses.

1. Steel plate tongs.

Also known as lifting tongs, it is mainly used for horizontal and vertical lifting of steel plates and the turning of section steel. It is forged from low-carbon high-quality alloy steel, which is safe and reliable to work, compact in structure, light in weight, fixed hanging beam, easy to install, and quick and convenient to adjust the width of the clamping rail.

2. C-type spreader.

The C-type spreader is mainly used for the degree of lifting of the coil, and its lifting and installation process, the structure is simple and reasonable, the action is sensitive, the use of lunch, and the lifting is safe and reliable. The main body of the C-type spreader is made of steel plate (high-quality low-alloy steel) and steel pipe, and the cross-section is a box-shaped structure, which has good bending resistance and change performance, and the spreader is heavy in weight and has a long service life.

3. Balance beam spreader.

The balance beam spreader is used to lift goods such as columns, roof trusses, etc. The lifting installation process is simple and reasonable, the action is flexible, the use is convenient, and the lifting is safe and reliable. The rigging that is mainly used to connect the load-bearing beam and the tundish is the lifting lugs at the left and right ends of the lifting beam.

4. Metallurgical fixtures.

Metallurgical fixtures are mainly used in steel industry, stainless steel industry, aluminum industry, large freight yards, freight terminals, etc.

5. Roll spreader.

The single-roll spreader adopts an automatic opening and closing mechanism to control the opening and closing of the jaws, the support mechanism is supported on the bearing seat of the roll, and the copper plate is installed at the contact part between the clamp body and the roll body, which can effectively protect the roll from injury; The support mechanism can be adjusted and can be adapted to different roll diameters.

Slings are mainly divided into two categories: metal slings and synthetic fiber slings.

1. Metal sling.

Metal slings mainly include wire rope slings, chain slings, slings with slings, shackles, hooks, slings (clamps), magnetic spreaders, etc.

2. Synthetic fiber sling.

Synthetic fiber slings mainly include ropes and belts made of nylon, polypropylene, polyester, and high-strength and high-modulus polyethylene fibers.

In mechanical and electrical engineering lifting technology, slings mainly include wire ropes, pulley sets, winches and balance beams.

Uses of different slings:

1. Wire rope.

Wire rope rigging is made of wire rope as raw material, which is mainly used for hoisting, traction, tensioning and bearing, and is widely used in steel, chemical, transportation, port and other industries in hoisting operations.

2. a chain cable.

Chain rigging is a rigging made of metal chain links, which has the advantages of wear resistance, high temperature resistance and low ductility, and is widely used in large-scale and frequent use occasions in hoisting operations.

3. a hoisting belt.

The lifting belt is generally made of high-strength polyester filament, which has the advantages of light weight, good flexibility, easy bending, and convenient use, and is widely used in ports, docks, chemicals, steel, machinery, installation and other lifting places in hoisting operations.

First of all, let's take a look at the definition: spreader, refers to the rigid fetching device for lifting and lifting operations; Rigging refers to a flexible combined fetching device that is tied to the hook and hung on the article when lifting the item. That is to say, items can be lifted directly, mainly including:

hooks, grabs, clamps, suction cups and special spreaders, etc.; The rigging is used to tie items, which is generally composed of high-strength flexible parts (wire ropes, lifting ring chains, man-made fiber belts, etc.) with end rings, hooks, shackles, etc. The ultimate working load of the general spreader refers to: the maximum mass (weight) of the item that a single sling is allowed to bear when it is suspended vertically under normal use conditions; Maximum safe working load of the rigging:

In addition to the vertical suspension use, there is an angle between the sling hanging point and the article, so that the sling 0 force changes, and the maximum quality allowed to be borne under a specific hanging method. The spreader can directly lift the item, and the rigging is a combined fetching device. Commonly used in spreaders are special rigging such as hooks, wire ropes, and chains.

Lifting suction cups, clamps and forks can be used as special spreaders on the crane for a long time, and can also be used as replaceable auxiliary spreaders to hang on the hook temporarily, and are often used in multi-cargo warehouses and storage yards to improve operation efficiency. The spreader for grabbing bulk materials is generally a grab with a jaw plate that can be opened and closed, and an electromagnetic chuck can also be used to absorb magnetic materials such as metal chips. The spreaders commonly used to lift fluidity materials are barrels and hanging tanks, generally unloading molten steel or chemical solutions by tilting or pulling bottom plugs, etc., and unloading fluidity materials such as concrete by opening the bottom door of the hanging tank.

In order to meet the daily maintenance and lifting of large machinery, some domestic sling companies have also designed some special spreaders, such as fan spreaders, tower spreaders, blade spreaders, hub spreaders, steam turbines and other non-standard spreaders. <>

Spreader, it refers to the rigid fetching device used in lifting and hoisting operations, that is, the device that can directly lift items, such as hooks, grabs, clamps, suction cups, etc., are one of the spreaders. The rigging is a combination of fetching devices, and it is flexible, generally composed of high-strength flexible parts, and then combined with end rings, hooks, shackles, etc. Therefore, there is still a fundamental difference between the two.

Requirements for the use of spreaders and rigging: The use of spreaders and rigging should be adapted to the type, specific requirements of lifting and the use environment. The spreader and rigging should be inspected before operation to confirm that they are intact and can be used normally before they can be used.

Before hitching, it should be confirmed whether the lifting tether connection point is firm and reliable to avoid problems. It cannot exceed the rated lifting capacity to carry it, and it cannot exceed the safety load. <>

In the design, because the rigging is mainly used in the chain, etc., he can only bear the tensile stress, can not bear the compressive stress, and the spreader can not only withstand the tensile stress but also the compressive stress. It seems that the spreader has more advantages than the rigging, but the rigging also has a feature that its tensile stress can change direction, while the spreader does not have this function. In order to unify the two, make full use of their advantages and reduce their disadvantages, hence the advent of slings.

During the application of the sling, the magnitude and direction of the force can be changed according to the need, and the tensile stress and compressive stress can also be appropriately distributed. Another advantage of the spreader is that it can withstand torque, including bending stress, torque, etc., which can be well used in slings. With the above understanding, when we design slings, we can design slings that meet different kinds of different needs according to their characteristics.

Summary. It belongs to the spreader.

It belongs to the spreader.

First of all, let's take a look at the definition: spreader, refers to the rigid fetching device for lifting and lifting operations; Rigging refers to a flexible collection device that is tied to the hook and hung on the article when lifting the goods. That is to say, items can be lifted directly, mainly including:

hooks, grabs, clamps, suction cups and special spreaders, etc.; The rigging is used to tie items, which are generally composed of high-strength flexible parts (steel state bright wire rope, lifting ring chain, man-made fiber belt, etc.) with end rings, hooks, shackles, etc.

A sling is a lifting tool made of wire rope.

1. Low-carbon and low-carbon electric heating film. The film is the core element of the whole system and is the heating element of the system. This is a special mylar substrate for PET, a special conductive ink heating element, accompanied by a silver paste and a conductive metal busbar of wires, the last of which is hot-pressed for the composite material.

The low-carbon electric heating film heating method is mainly thermal radiation, which is a kind of low-temperature radiation, which is transparent, and radiates through the noisy code in the form of infrared heating.

2. T-type cable, insulated and waterproof quick plug. The T cable provides power to the heating film to the entire circuit circuit, and the insulating anti-mold water quick plug is separated together with the supporting electric heating film to ensure the operation of the low-carbon electric heating film safe heating system.

3. Temperature sensor and thermostat. The whole low-carbon electric heating system of the membrane is controlled to ensure the stability of the indoor temperature.

Answers]: a, d

This question examines the requirements for the use of cranes and spreaders. When the wire rope is bypassed the pin or pulley of the same size, its strength should be reduced according to different bending conditions.

The wire rope loop (lifting belt) shall not be used in one of the following situations:

1) The end of the rope at the no-hanging sign is exposed and cannot be repaired.

2) The strands are loose or detached and cannot be repaired.

3) Defects such as broken wire, broken strands, wire extrusion, single-layer strand wire rope core extrusion, partial reduction of wire rope diameter, rope strand extrusion or twisting, kinking and so on. That's right.

4) No signage.