Mechanized complex-tool. Drawing, description

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Mechanized complex-tool. home workshop

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The wrench for tightening nuts is still a manual tool, and this operation is difficult to mechanize. True, pneumatic or electric wrenches have long been used on assembly lines. But this is, firstly, in the stationary conditions of the enterprise, and secondly, with limited rotational loads transferred to the hands of the worker. But what if the installation takes place in the field, say, on the laying of an oil or gas pipeline, and you have to tighten the nuts the size of a saucer?

To facilitate such a labor-intensive operation, a mechanized tool complex developed by NTTM participants, innovators of the Neftekhimmontazh trust, Glavneftemontazh of the USSR Minmontazhspetsstroy, is called upon. It is a machine for tightening large diameter threaded connections on the flanges of pipelines and equipment operating under high pressure. It consists of a portable pumping station, a hydraulic jack with brackets and a set of special spanners.

The pumping station, which creates the necessary force on the tool through a high-pressure hose, is assembled from a single-plunger pump, an oil reservoir with a pressure gauge and a drilling machine that acts as an electric drive. The reciprocating motion of the pump plunger is given by an eccentric roller mounted on the machine spindle and pushing the plunger head during rotation.

Mechanized complex-tool
Complex tool: 1 - hydraulic tong bracket, 2 - hoses, 3 - hydraulic jack, 4 - handle, 5 - plunger tip, 6 - finger, 7 - comb, 8 - wrench, 9 - flange, 10 - pressure gauge, 11 - pump ( NRD-400), 12 - eccentric roller, 13 - electric drilling machine (IE-1023), 14 - oil reservoir

A special wrench with a special comb on the lever is put on the screwed nut to engage with the tip of the hydraulic jack. The hydraulic jack itself on a bracket with a hole of a suitable diameter is installed on a nut adjacent to the screwed nut. In this case, the finger of the tip at the jack plunger enters the corresponding groove at the wrench comb. The pump is turned on, and under liquid pressure (200 kgf / cm2), the plunger presses through the tip on the key lever, creating a force of over 5 thousand kgf. This makes it possible to effortlessly tighten nuts with a threaded hole diameter of up to 102 mm and wrench sizes up to 146 mm.

With the help of a complex tool, you can also unscrew the threaded connections of large diameters, selecting in each case the appropriate wrench and bracket for the hydraulic jack.

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