As said in wikipedia, a hydraulic torque wrench is a power tool designed to exert torque on a fastener to achieve proper tightening or loosening of a connection through the use of hydraulics. it is most used in mining, refining and petrochemical industry. This tool is perfect and efficient for bolting work, especially for a tight working room.
hydraulic wrench types
There are two series of hydraulic wrenches: driven hydraulic wrenches and hollow hydraulic wrenches. As the name implies, the drive hydraulic wrench relies on the drive shaft to drive the corresponding specification sleeve to achieve the pre-tightening of the nut. As long as the torque range allows, the corresponding high-strength sleeve can be replaced to complete the bolts of different specifications. It is a general-purpose hydraulic wrench. , The scope of application is wider. The hollow hydraulic wrench is equipped with a transition sleeve. Generally, the extension of the screw rod is relatively long, the space range is relatively small, the spacing between double nuts and bolts is too small, the nut and the equipment wall are too small, or there are more difficult working conditions in some specific industries.
square drive hydraulic wrench
MXTD-driven hydraulic torque wrench is made of aluminum-titanium alloy and ultra-high-strength alloy materials. It is manually controlled and has a double-acting hydraulic design. It can lock and loosen the bolt connection. It is widely used for the disassembly of high-torque bolts. The torque can be accurately adjusted. , The error does not exceed ±3%.
The structure of the MXTD driven hydraulic torque wrench consists of the following parts: the wrench body, rotary joint, quick joint, reaction arm, drive shaft, locker and release trigger, as shown in the following figure:
|②||3600 X1800 swivel joint|
|④||3600 reaction arm|
|⑦||Square drive locker|
|⑧||Quick release trigger|
low profile hydraulic wrench
KLCD hollow hydraulic torque wrench is made of aluminum-titanium alloy and ultra-high-strength alloy materials. It is manually controlled and has a double-acting hydraulic design. It can lock and loosen the bolt connection. It is widely used for the disassembly of high-torque bolts. The torque can be accurately adjusted. , The error does not exceed ±3%.
The structure of the KLCD-driven hydraulic torque wrench consists of the following parts: working head, long pin shaft, power head, quick joint, rotary joint, reaction arm, quick combination pin, ratchet and release trigger, as shown in the following figure:
|②||Long axis pin|
|⑦||Quick combined pin|
|⑨||Quick release trigger|
The difference between square drive and low profile type
The hollow wrench is small in size and light in weight, which is very suitable for use in places with narrow space. There is also a hollow wrench composed of a power head and a working head. Generally, the working head can be disassembled, but a working head is best used in a nut specification , The versatility is relatively weak. In comparison, the drive shaft wrench is larger in size and difficult to place in some narrow places, but it can be used with sockets of different specifications, so it is more versatile.
Features of hollow hydraulic wrench:
- It adopts the design of high-strength light metal, high speed, large corner
- Clip-on type, no special tools are needed, and the torque repeatability is as high as 3%.
- 360°×180° rotary joint, suitable for compact occasions, convenient for positioning.
- In most cases, it is suitable for special working conditions. The double nuts, bolts and the equipment wall are too close, and the distance between the nuts is too small.
Features of drive hydraulic wrench:
- It is made of high-tech aerospace materials and ultra-high-strength alloy steel, which comprehensively strengthens the strength and toughness of the fuselage, and adopts one-piece molding.
- The trigger-type buckle lock can be easily pressed, and the 360-degree fine-tuning reaction force arm can be set on a solid fulcrum at will.
- You can choose to use rotating tubing joints, and there is no restriction on the use of space, and you can operate freely.
- High precision, precision ratchet is used.
How to select the hydraulic wrench?
First of all, we must understand the bolt specifications that need to be solved with a hydraulic wrench and the required torque. The bolt specifications are generally known by customers, but some of the required torques are available, but most of the time we don’t know. This requires understanding the bolt material and strength grade in order to compare it with the recommendation table given by the wrench manufacturer when selecting the type. Recommended torque required to remove lock bolts.
Secondly, it is necessary to know several data of the working environment in order to correctly select the type of hydraulic wrench required. We all know that conventional hydraulic wrenches are generally divided into two categories: driven hydraulic wrenches and hollow hydraulic wrenches. Whether the drive type or the hollow type is used mainly depends on these parameters. Bolt distance, distance between bolt and equipment body, height of bolt outcrop. If several data are within the applicable scope of the drive shaft hydraulic wrench, that is to say, the space can be put in and the reaction arm has a place to support, then the first choice must be the drive type. Conversely, if there is one item that is not in its applicable range, then you have to refer to the various parameters of the hollow type hydraulic wrench torque applicable model, and if it meets the requirements, you can choose the hollow type. However, there are some special situations, such as excessively large spacing, and the reaction force of the wrench is nowhere to be more reliable, so you have to consider making tooling aids to solve the problem.
Finally, knowing these parameters must also consider the use industry and environment. Some industries, such as coal mines, require explosion-proof tools, so we can’t use conventional configurations and must be equipped with special pumps for explosion-proof hydraulic wrenches. In some industries, such as petrochemical overhaul, the recommended torque values we obtained based on the bolt specifications and materials mentioned above are not reliable, because the working environment is more complicated, and often the same bolts can only be solved by choosing a larger torque wrench.
Hydraulic wrenches are widely used; in shipbuilding, petrochemical, wind power, hydropower, thermal power, mining, machinery, steel mills, rubber, pipelines and other industries construction, maintenance, emergency repairs, etc., hydraulic wrenches are used for large-size bolts. Installation and disassembly are both important tools; other tools are irreplaceable, not only easy to use, but also the torque provided is very accurate.