Q:The permanent magnet (permanent magnet sucker) the principle of who knows?

Permanent magnet sucker (also known as the permanent magnet lifter, Permanent Magnet Lifter) into manual type permanent magnet lifter and automatic permanent magnet crane two, using modern high performance Nd-fe-B NdFeB magnetic material, the smaller, lighter weight, better retention, unique magnetic circuit design the residual magnetism is almost zero. High safety coefficient, the maximum pull-out force is rated 2.8-4 times of gravity. Manual type permanent magnet lifter handle with safety switch button, single hand operation, convenient and safe. Design of "V" groove for lifting bottom. Full automatic permanent magnet crane without human pull handle, by lifting the electric hoist hook can control adsorption, round steel, steel plate, lifting the corresponding electricity, safe use, widely used in steel lifting, installation and handling machinery and all kinds of mold parts of the formation of. The utility model is suitable for lifting tools such as shipbuilding, construction machinery, automobiles, etc. at normal temperature, steel plate lifting, conveying and the like. Mainly used in hoisting process and the hoisting of the workpiece connection, (such as: and chain hoist, wire rope, electric hoist and so on), used for moving iron plate, block and cylindrical magnetic conduction material work. Easy to operate, safe and reliable, compact and light results. Widely used in factories, docks, warehouses, transportation industry. Improve working conditions of loading and unloading, improve labor efficiency.

Q:What is the working principle of a screw jack? What's the difference between an ordinary hydraulic jack and an ordinary hydraulic jack?

The screw jack is a pure machine, and the two jacks are fundamentally different in principle. Open the relief valve. Press the small piston constantly, and the big piston can shrink back under the action of gravity

Q:Working principle of mechanical screw jack

When the brake is relaxed, the weight can fall rapidly and shorten the return time, but the jack structure is complicated. The screw jack can support heavy load for a long time, the maximum lifting capacity has reached 100 tons, and it is widely used. When the lower part is loaded with a horizontal screw rod, the heavy object can be moved at a small distance.

Q:Is the electric crane with track electric hoist or other mechanical products?

The crane with track has electric hoist, single beam crane, double beam hoist crane. Double beam bridge crane, Longmen crane. Cranes usually have rails.

Q:Please explain how to prevent the safety accidents in the process of tower crane installation and disassembly

The tower crane (also known as the tower) with crane and tower body mutually vertical shape, so it can be installed in the nearby construction engineering and effective working range than other types of cranes. The working height of the tower crane can reach 100 ~ 160m, which is especially suitable for the construction of high-rise and super high-rise buildings. In addition, the operation is convenient and the amplitude is simple, and has been widely applied in the construction. However, due to the uneven assembly and disassembly or other reasons, tower crane safety accidents happen frequently. In view of the serious accidents occurring in the loading and unloading of tower cranes in recent years, this paper discusses the problems concerning installation, demolition, operation, maintenance and safety management of tower cranes.

Q:Hoisting safety notice

Safety measures shall be taken to prevent the overturning of the crane (1). The road on the lifting site shall be level and solid, and the backfill and soft soil shall be treated. If the soil is soft, roads should be paved separately. Parking crane is not working on a slope, also does not allow the crane two side high. (2) overload lifting is strictly prohibited. (3) prohibition of oblique hanging. Inclined hanging will cause overload and wire rope out, and even cause tension rope and rollover accident. The crane also causes the heavy object to swing out of the ground rapidly and may cause people or other objects to be damaged. (4). The component shall be binding sling after calculation, all lifting tools should be regularly checked, make an appraisal on the damage, the binding method should be correct and firm, to prevent lifting slings breaking or slipping from the component, the crane tipping and weight loss. (5) important components and equipment that are not suspended from weight. (6) prohibit lifting operation under the condition of grade six wind. (7) command personnel should use unified command signal, which should be clear and accurate. The crane driver should obey the command.

Q:When should the temporary fixing tool for lifting work be removed?

The commonly used wire rope phosphate coated steel wire rope, galvanized steel wire, stainless steel wire rope or coated steel wire rope, the use of atmospheric environment, patented technology to produce manganese phosphating coating of steel wire rope has the longest lifespan, heavy corrosion environment optimization of hot galvanized wire rope double - phosphating coating

Q:I want to know what the principle of magnetic suspension is. Why does it make magnetism disappear?! What is the structure like?!

Magnetic crane also known as the permanent magnet by high performance NdFeB permanent magnetic material magnetic system, by turning the handle, change the magnetic system of magnetic workpiece holding and releasing.

Q:What are the points for attention in the course of transportation of double beam cranes?

Component preparation, component preparation, including component counting, inspection and appearance modification, etc..(1) counting the components, including the type and quantity of the components, checking the order of the components according to the lifting sequence of the components, and determining the sequence of the loading of the components.(2) inspection component. Including size, geometry, the placement of parts and rings, and the stability of the location of the installation hole and the hole through the hole and so on.(3) check the weld seam of the steel structure. Including the weld size, appearance and connections whether the design and specifications meet the requirements, such as beyond the allowable error, should be taken effective measures to deal with.(4) appearance inspection and modification of components. Found defects and damage, such as cracks, pits, broken edge, weld length, height is not enough, weld ash or porosity, should be modified and after welding, to transport and use.

Q:What are the heavy lifting units commonly used in hoisting operations?

Lifting belt, wire rope sling and crowbar size etc.