Archives - March, 2012



5 Mar 12

The design of the central (parking) brake disk is completely improvised. Parts made of steel, The sv (ST5), except for a plastic ball on the end of the arm, having a radius of 7,5 mm. Brakes are equipped with only the rear (driven) wheels borrowed from the UAZ-452. Front – from the buggy nwa. The fuel tank as an air filter, muffler – prefabricated from the engine AP-2. But the cavity-homemade. Is made of shells strung together tightly blowtorch.

As for fitting, at the bottom of the cavity, then it is made from a segment tailpipe of a car Moskvich-408. "Micro tractor equipped with lighting devices for confident movement in traffic and at night (evening) time of day. Power is supplied from the tractor generator 700 W, working with relay control PP-350. At a set of engine 1800 rpm and more self-excited generator and confidently holds the load. Displayed on the dashboard ammeter, fuel gauge in the tank, oil pressure, tachometer, lamp control rotation, as well as a pointer to engine overheating.

Thermocouple temperature sensor is "Chromel-Kopel, mounted on the cooling fins of the cylinder heads. In conclusion – a few words for doubters. Practice from across convincingly shown the promise of a V-belt clutch in makeshift structures of agricultural machinery. Bribe the simplicity and reliability. Annual wear belts .Remennoe clutch can recommend designs with engines Zil-4, 5, AP-15. If we apply the trailing and leading pulleys of different diameters (stepped), it is easy to get a few gear ratios of transmission in conjunction with a four- gearbox.


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3 Mar 12

The traditional source of alternating current for welding is a welding transformer. DC power supply is a rectifier, which is designed on the basis of the transformer and the semiconductor rectifier. Widespread and inverter power sources, which are used for welding both alternating and direct current. Intermediate position between traditional rectifiers and inverters occupy sources, which include a simple 50-Hz welding rectifier, control current is a key regulator of a semiconductor operating at high frequency. Technological capabilities of the sources Supply by external volt-ampere characteristics. Static characteristic of the power supply is a plot of output voltage of the load current at constant voltage mains in the steady state. By type of static external characteristics of current sources can be divided into sources with the incident (PVC) "cool" and "gentle" or rigid (ZHVH) external characteristics.

Sources with external characteristics of the two species are said to be universal. Requirements to view the external characteristics are determined by the welding process parameters as the type of electrode (consumable without melting), the nature of the environment in which the welding (open arc, submerged arc, gas shielded), degree of mechanization (hand, machine, automatic welding) method of regulating the mode of arc (self-regulation, the automatic regulate voltage arcs). For example, for manual arc welding with coated stick electrodes, TIG welding TIG, submerged arc welding machines for the regulation of feed speed electrode wire as a function of the arc voltage sources are used in PVC. PVC power supply operates in control of welding current. Welding current can be adjusted smoothly and the specified range or steps.

On process conditions using sliding cascade control when two or more levels of regulation combined with infinitely variable within each level. Control of welding current for PVC performed at approximately constant load voltage. Each type of welding corresponds to a certain slope steepness PVC. For example, the steeper the characteristics used for TIG welding more gentle – for submerged arc welding. Length of arc in the welding process for PVC is manually adjusted or regulatory system in the welding machine. Mechanized welding in the environment and the C02 in automatic welding under flux at constant speed wire feed power supply is used with ZHVH. In this case, power supply acts as a regulator operating voltage, which is regulated within the prescribed limits, subject to specified value of the welding current. Voltage regulation at ZHVH may be gradual, stepwise and mixed. The value of the welding current is determined by the speed of wire feed and power supply sets the voltage arc and provides a self-arc length. The duration of the power supply should not be prolonged in order to avoid unacceptable heat insulation of the power.


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2 Mar 12

Citroen at the Paris Motor Show revealed two visited a plastic surgeon's CD-Wen family C4 Picasso – korotkobaznuyu and elongated version. Cars were identical to changes in appearance and interior. Minivans released in 2007 and after three years of life on the line it's time to update their appearance. True, notice the difference will not be easy – except for a new bumper with LED modified "double chevron" on grille and tailgate, the other rear optics, and a panoramic roof, the changes in vneshnoti almost not noticeable. The interior is altogether possible to note a different seat upholstery.

But part of the equipment on vans made a significant leap forward. First, it refers to the so-called "micro-hybrid" system of e-HDi, which consists of a "start / stop" of the 2nd generation robotic gearbox and a diesel engine 110 HDI FAP. Thanks to e-HDi consumption fuel fell by 15% and now it fits in 4.8 liters per 100 kilometers from Citroen C4 Picasso and a long wheelbase 5.0 liter, 7-seater version of the Citroen Grand C4 Picasso. Carbon dioxide emissions also became less and does not rise more than 125 g / km. In addition, both minivans now set up the communication system that has eTouch GPS-navigation and built-in SIM-card. ETouch system works on its own battery and in case of an accident alone can transmit a signal SOS. In addition, it can help You can access the Internet, read a virtual directory and call the technical assistance. For cars is now installed high-capacity battery that can withstand a guarantee of 600 000 cycles of engine start. Revised Citroen C4 Picasso and Grand C4 Picasso celebrated debut at the Paris Motor Show on 30 September and almost immediately entered the salons of European dealers.


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