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Biographie A compactor is a machine or mechanism used to reduce the size of material such as waste material or bio mass through compaction. A trash compactor is often used by a home or business to reduce the volume of trash it produces. A baler-wrapper compactor is often used for making compact and wrapped bales in order to improve logistics. Normally powered by hydraulics, compactors take many shapes and sizes. In landfill sites for example, a large tractor (typically a converted front end loader with some variant of a bulldozer blade attached) with spiked steel wheels called a landfill compactor is used to drive over waste deposited by waste collection vehicles (WCVs). WCVs themselves incorporate a compacting mechanism which is used to increase the payload of the vehicle and reduce the number of times it has to empty. This usually takes the form of hydraulically powered sliding plates which sweep out the collection hopper and compress the material into what has already been loaded. Different compactors are used in scrap metal processing, the most familiar being the car crusher. Such devices can be of either the "pancake" type, where a scrap automobile is flattened by a huge descending hydraulically powered plate, or the baling press, where the automobile is compressed from several directions until it resembles a large cube.

In construction, there are three main types of compactor: the plate, the rammer, and the road roller. The roller type compactors are used for compacting crushed rock as the base layer underneath concrete or stone foundations or slabs. The plate compactor, vibrating plate, or tamper, has a large vibrating baseplate and is suited for creating a level grade, while the rammer compactor has a smaller foot. The rammer, or trench rammer, is mainly used to compact the backfill in narrow trenches for water or gas supply pipes etc. Road rollers may also have vibrating rollers. In plates and rollers the vibration is provided by rapidly rotating eccentric masses. In smaller plates the vibration causes a tendency to move forwards, while some larger plates are provided with a directional control. In the rammer the foot is mounted on a sleeve that slides vertically in the leg. Inside the sleeve, a piston is driven up and down by the engine through a reduction gear, crank and connecting rod. Substantial coil springs above and below the piston connect it to the sliding sleeve. The connection between the sleeve and foot is at small angle so that the whole rammer leans away from the operator. The vibrating motion is therefore slightly off the vertical, and this gives the rammer a tendency to 'walk' forwards. The sliding joint in the leg is protected by a flexible bellows.

A ramrod (or scouring stick) is a metal or wooden device used with muzzleloading firearms to push the projectile up against the propellant (mainly blackpowder). The ramrod was used with weapons such as muskets and cannons and was usually held in a notch underneath the barrel. Bullets that did not fit snugly in the barrel were often secured in place by a wad of paper or cloth, but either way, ramming was necessary to place the bullet securely at the rear of the barrel. Ramming was also needed to tamp the powder so that it would explode properly instead of fizzle (this was a leading cause of misfires). The ramrod could also be fitted with tools for various tasks such as cleaning the weapon, or retrieving a stuck bullet. Cap and ball revolvers were loaded a bit like muzzleloaders—powder was poured into each chamber of the cylinder from the muzzle end, and a bullet was then squeezed in. Such handguns usually had a ramming mechanism built into the frame. The user pulled a lever underneath the barrel of the pistol, which pushed a rammer into the aligned chamber.

With the development of modern mechanical processing industry, the requirements for cutting quality and accuracy are constantly improving, and the requirements for improving production efficiency, reducing production cost and having high intelligent automatic cutting function are also improving. The development of NC cutting machine must meet the requirements of the development of modern mechanical processing industry. Cutting machine is divided into flame cutting machine, plasma cutting machine, laser cutting machine, water cutting, etc. Laser cutting machine has the fastest efficiency, the highest cutting accuracy and generally small cutting thickness. The cutting speed of plasma cutting machine is also very fast, and the cutting surface has a certain slope. Flame cutting machine needle for thick carbon steel material. Cutting machines are used in metal and non-metal industries. Generally speaking, non-metal industries are divided in detail, such as stone cutting machines for cutting stone, concrete cutters, water cutting machines, sawtooth cutting machines, laser cutting machines for cutting cloth and plastic, chemical fiber products, blade cutting machines, flame cutting machines, plasma cutting machines for cutting metal materials, and NC cutting machines in flame cutting machines, And manual. Manual includes small sports car, semi-automatic, pure manual, CNC, gantry CNC cutting machine, cantilever CNC cutting machine, desktop CNC cutting machine, intersecting line CNC cutting machine, etc.

The trowel machine is also known as the light receiver. Its main structure is a trowel rotor driven by gasoline engine, and a trowel is installed on the bottom of the cross in the middle of the rotor. The tilt direction of the spatula is consistent with the rotation direction of the rotor. The triangular belt driven by the gasoline engine rotates the spatula rotor. When operating, start the fire first, hold the joystick, and push forward together to move forward, and pull back together to move backward. It can do 100 ~ 300m2 per hour on average, which can improve the work efficiency by more than 30 times compared with manual troweling. It is a coarse and fine troweling machine for concrete surface. The surface of machine construction is smoother and smoother than that of manual construction, which can greatly improve the compactness and wear resistance of concrete surface, and improve the work efficiency by more than 10 times compared with manual operation. The ground troweling machine can be widely used for slurry lifting, troweling and troweling of the concrete surface of high-standard workshops, warehouses, parking lots, squares, airports and frame buildings. It is the preferred tool in concrete construction.

Road construction machinery is a kind of machinery used to build and maintain roads. It is also called "road machinery". There are mainly circuit breakers, bulldozers, scrapers, leveling machines, loaders, rollers, etc. When the pavement needs to be paved, there are pavement engineering machinery such as pavement material preparation and paving machinery, as well as auxiliary engineering machinery such as lifting, transportation and stone processing.

Gasoline engine is an engine that uses gasoline as fuel to convert internal energy into kinetic energy. Due to the small viscosity and fast evaporation of gasoline, gasoline can be injected into the cylinder with the gasoline injection system. After being compressed to a certain temperature and pressure, it can be ignited with a spark plug to expand the gas and do work. Gasoline engine is characterized by high speed, simple structure, light weight, low cost, stable operation and convenient use and maintenance. Gasoline engines are widely used in cars, especially small cars. It includes many gasoline engine accessories. The engine body is the assembly matrix of all parts of the engine. It includes cylinder head, cylinder block and lower crankcase (oil pan). The cylinder head and the inner wall of the cylinder block together form a part of the combustion chamber. Many parts of the body are components of other systems. Crank and connecting rod mechanism is the mechanism by which the engine generates and transmits power. Through it, the linear reciprocating motion of the piston is transformed into the rotary motion of the crankshaft to output power. It includes piston, piston pin, connecting rod, crankshaft with flywheel and cylinder block. 
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