Tritorc wrenches, cassette and interchangeable head wrenches

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Classification of hydraulic impact wrenches

The classification of hydraulic impact wrenches can be made according to the design of the working head. There are end and cassette wrenches.

Socket wrenches

In them, the working head is movable, and the opening of the terminals is carried out using a screw pair. These tools are not designed to transmit significant torque.

Since the socket head can be used by throwing it over the head of a bolt or nut, it is more convenient to use such a tool for dismantling work associated with difficulties in unscrewing, for example, for corroded fasteners.

Cassette wrenches

More functional are hydraulic cassette wrenches. They are equipped with interchangeable hex cassettes to provide controlled tightening of fasteners of different sizes.

Cassette type hydraulic nuts are much more functional when used in hard-to-reach conditions.

The basic techniques for working with hydraulic impact wrenches are unchanged. When oil under the required pressure enters the working cylinder, the piston moves accordingly, which is converted into torque using a ratchet mechanism. When the piston is extended, the pawl engages on the ratchet wheel, and the ratchet turns.

At the moment of turning, the pawl disengages, and there is no resistance to the rotation of the working head. Excess fluid is vented through the safety valve and returned to the line.

To ensure proper rigidity and durability, all parts of hydraulic impact wrenches are manufactured from high quality materials: bodies are made of anti-corrosion treated structural steels and transmission parts are made of hardened steels. Titanium alloys are also used for the manufacture of cylinder parts.

Design features of the tool

The basic components of this nutrunner include the body, the hinge system, the reaction arm and the grip handle. But this mechanic does not work without a drive, which is a hydraulic station. It can have a different design, but a high-pressure hose is used as a means of switching. For the convenience of pairing a hydraulic nutrunner with a force transmitter, quick-release couplings and other universal connection devices can be used. A double-acting hydraulic cylinder block is also located inside the housing. In the process of operation, its piston mates with a ratchet system, which, in turn, consists of a power pawl, levers and a power wheel with a planetary gear.Through the articulated ligament, the fluid flows into the hydraulic cylinder, creating the necessary pressure that turns into force.

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How to choose a hydraulic impact wrench

It is not easy to decide on the most functional model, since electric and pneumatic wrenches are also widely used. For all their merits, they are, however, unable to develop significant torques. The exception is impact wrenches, developing torques up to 2400 ... 2500 N · m. In other situations, it is more rational to use hydraulic impact wrenches.

Use the following experimental relationships between the thread diameter of the fastener and the required torque:

with a diameter of up to M16 - 250 Nm;
with a diameter of up to M20 - 600 Nm;
with a diameter of up to M30 - 1000 Nm.

The presence of rust and dirt increases the required torque values by 30 ... 40%.

The digital part of the marking of domestic-made hydraulic nutrunners (Enerpred trademark) includes an indication of the limiting torque developed by the tool. So, the most powerful of them is the GG1100T model, designed for a torque of 1100 Nm, which allows you to unscrew the nuts from M32 to M150 inclusive. The GG800T hydraulic nut wrench, designed to work with fasteners of similar dimensions, has practically the same functionality. The tool is equipped with a built-in time relay: this allows it to work from the drive of a pumping station of the NEA type in automatic mode. High-pressure hoses are hinged, which increases the technological flexibility of this technique.

The GR500 hydraulic nutrunner belongs to the reversible type tool. It allows you to briefly change the direction of rotation of the working head, which is often used when installing old and rusted fasteners.

From foreign models, Plarad hydraulic nutrunners are popular, produced in various designs: end (MSX, MS-EX), cassette (FSX), as well as special (stud tensioners). In the latter case, the torque is transmitted directly to the fastener rod. Plarad's most powerful end wrenches provide up to 65,000 Nm of torque.

Popular tool manufacturers

With all its advantages, in Russia, nutrunners with hydraulic cylinders are less popular than electric counterparts. Among domestic manufacturers, one can single out the Nordman enterprises with the Torc and TTZ lines, as well as Hydraulic Pro, under the brand of which a good model for household needs SPT615130010 is produced. As for foreign manufacturers, Jonnesway, Metabo, Enerpac, Abac and FUBAG offer their developments in this category. These are companies that are closely engaged in the design and production of engineering power equipment - the same hydraulic and compressor stations. However, niche developers of hand tools are also represented in the segment. For example, the Stanley IW 16 hydraulic impact wrench with a maximum pressure of up to 175 bar shows an example of the optimal interaction of productive equipment and a compact device for performing small-format manual operations.

Application area

Most often, manual torque wrenches with a gearbox are used in industrial production for the installation and dismantling of fasteners for large metal structures. He found his other purpose in a car repair shop, where he became very much in demand. It is also often used on construction sites, in shipbuilding and other areas of production. Its widespread use by locksmiths is due to the need to work with massive structures or loaded threaded connections, which are problematic to disassemble with a conventional tool.

At home, these tools cannot be attributed to the necessary tools, which, for example, are screwdrivers, since they are easily replaced with wrenches or wheel wrenches, and a large tightening power is not required. As a rule, truckers buy such a device - it is very convenient for them to change broken wheels on trips without wasting much time. The "meat grinder" will also come in handy in the implementation of some home construction project, where large threaded connections are used.

Bolt Tensioners

This hydraulic tool works on a completely different principle - in contrast to impact wrenches:

It transfers the tension force to the fastener directly - to the stud body itself, and not indirectly - through the torque applied to the nut (and through the thread to the bolt), as is customary in a traditional torque tool.

See below for other materials you may be interested in:

Pneumatic, pulse and electric torque wrenches and hand multipliers

Electronic torque wrenches

All about torque wrenches: types, classification, features

Do you know how to work with a torque wrench?

Goodbye

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Varieties of the instrument

Models of hydraulic impact wrenches are distinguished by two characteristics: impact action and purpose. In particular, hydraulic impact wrenches, in the process of applying force, make vibrational shocks - impulses. This allows you to deal with firmly seated fasteners - including rusted and large format. Accordingly, shockless models are free from such a function, but its absence cannot be called a disadvantage, since a more compact size and an even distribution of force at low speeds makes such wrenches optimal for standard operations.

End and flange models can be divided according to purpose. In the first case, we are talking about a tool designed for tightening bolts with a controlled torque. By the way, the tightening torque of a hydraulic face wrench can be about 60,000 Nm. For flanged or low profile models, the tightening torque when working with threaded connections does not exceed 50,000 Nm. These are compact and lightweight impact wrenches, which are often used when servicing hardware on high studs.

Advantages and disadvantages

The advantages of a manual mechanical wrench are as follows:

the use of a multiplier that converts torque and enhances it;
simple design and, as a result, reliability;
smooth unscrewing of a threaded connection;
lack of dependence on the availability of the power grid;
small size.

A relatively large mass of the tool can be considered a disadvantage, but it should be borne in mind that it is due to the use of reliable and durable metals and alloys in the design. Today, the combination "strong but light" means too high a cost for such a wrench. They also sometimes blame him for relatively high power, since you can easily break a hairpin or break a thread

But this is not true, since any, even the simplest tool, requires careful and careful handling.

Conclusion

Hydraulic mechanisms are often used as drive systems to support the functions of various equipment or tools that do not require a connection to the mains or batteries. Both pumping stations and compressor units can be used as a power system. Of course, their introduction into the working infrastructure complicates the organizational arrangements. And this is especially noticeable on the example of a hydraulic nutrunner, since such tools involve the performance of low-cost operations in terms of resources. Nevertheless, in many areas of industry, construction and production, such wrenches are simply irreplaceable. It is for reasons of versatility and the ability to work with fasteners of different types in conditions of separation from the main power supply sources.