What is the Advantage and Disadvantage of Hydraulic Threading Machine

What are hydraulic tools?

Hydraulic tools organically combine the hydraulic system with ordinary tools into a whole. Convert powerful hydraulic power into reciprocating linear motion, rotational motion, cycloidal motion and other mechanical motions. A complete hydraulic tool system consists of five parts, namely power components, actuating components, control components, auxiliary components and hydraulic oil.

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What tools are hydraulic tools?

1. Hydraulic wrench

Hydraulic torque wrench generally refers to a bolt-tightening tool that can output and set torque. It is a high-pressure hydraulic tool and is widely used in equipment maintenance and installation in many heavy and chemical industries. There are two types of hydraulic torque wrenches: drive shaft and hollow type.

2. Hydraulic wrench/tensioner/jack pump

Hydraulic wrench/tensioner/jack pumps include three types of pumps, namely wrench pumps, tensioning pumps and jack pumps. Their main function is to provide power for hydraulic wrenches, bolt tensioners, and hydraulic jacks. Each type of pump has subtle differences compared to other pumps, but their working principles are the same.

3. Hydraulic jacks

Hydraulic jack refers to a jack that uses a plunger or hydraulic cylinder as a rigid lifting member. It has the characteristics of compact structure, stable operation, large supporting force and self-locking. Hydraulic jacks have a strong support capacity, and heavy-duty hydraulic jacks have a support capacity of more than 100t.

4. Hydraulic bolt tensioner

The bolt hydraulic tensioner uses a hydraulic boost pump (ultra-high pressure hydraulic pump) to provide hydraulic power.

The tensile force is determined based on the tensile strength, yield coefficient and elongation of the material, and the tensile force generated by the ultra-high pressure oil pump is used to elongate the applied bolt in its elastic deformation zone.

The diameter of the bolt is slightly deformed, making the nut easy to loosen. In addition, it can also be used as a device for applying axial force to the hydraulic interference connection for top-pressure installation.

The biggest advantage of the tensioner is that multiple bolts can be tightened and disassembled at a fixed value at the same time with uniform force. It is a safe, efficient and fast tool and the best way to tighten and disassemble bolts of various specifications. It is used in the petrochemical industry, nuclear power, wind power, hydropower, thermal power, shipbuilding, railway, aerospace, mining, heavy machinery and other fields. According to different working conditions, application conditions and user requirements, special tensioners can be designed.

5. Hydraulic flange separator

Flange separator is a device for separating large industrial machines. It is divided into an integrated hydraulic flange separator and a split flange separator. Mainly used for pipeline maintenance, pipeline construction, testing and flange replacement, maintenance of gaskets, pressure vessels, cylinder head opening, power plants, bearing disassembly, oil and gas drilling, motor rotor disassembly, offshore platforms, jacking work, shipbuilding, industrial equipment, horizontal movement of workpieces and other industries.

6. Hydraulic nut splitter

Hydraulic nut splitters are used when the nuts on industrial equipment are exposed to the open air, high temperature, or corrosive environment, and are corroded and seized, and the threads are damaged due to collision.

Where the nut needs to be removed, it is usually very difficult to remove the rusted nut. The usual method is to use gas welding to cut off the nut and bolt together.

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However, in some special working environments, electric welding is sometimes strictly prohibited, such as underground coal mines, pulverized coal bins of thermal power plants, oil pipes and high-pressure and high-temperature pipelines, etc., making it even more difficult to replace nuts and bolts.

7. Hydraulic puller

The hydraulic puller moves forward directly with the hydraulic starting rod, so the push rod itself does not rotate. The hook seat can directly adjust the distance forward and backward along with the thread. During operation, as long as the handle swings back and forth slightly, the hydraulic starting rod moves forward, the hook correspondingly retreats, and the pulled object is pulled out.

The hydraulic puller is easy to operate and labor-saving. The three-claw type and the two-claw type can be replaced according to the needs of on-site work. You can freely rotate and press the puller to move away from the center point of the piston, and quickly touch the center point of the workpiece being pulled. Optional pumps are available.

8. Other

In addition to the above common hydraulic tools, there are many other hydraulic tools. Such as hydraulic splitting machines, hydraulic presses, hydraulic punching machines, hydraulic pipe bender, hydraulic nut crushers, hydraulic clamps, hydraulic cutters, etc.

Advantages of hydraulic tools

1. Mineral oil is generally used as the working medium. The relative moving surfaces can be self-lubricated and have a long service life.
2. Light weight, small size, small movement inertia and fast response speed.
3. Various components of hydraulic transmission can be arranged conveniently and flexibly according to needs.
4. Overload protection can be automatically realized.
5. It is easy to operate and control and can achieve a wide range of step-less speed regulation (speed regulation range up to :1).
6. It is easy to achieve linear motion.
7. It is easy to realize the automation of the machine. When electro-hydraulic joint control is adopted, not only a higher degree of automatic control process can be achieved, but also remote control can be achieved.

Disadvantages of hydraulic tools

1. It is prone to leakage. The oil pressure of the hydraulic system is high, and the hydraulic oil can easily leak through seals or gaps, causing the consumption of hydraulic media and causing environmental pollution.
2. Low transmission efficiency: During the energy transmission process of hydraulic transmission, there are often more energy losses (pressure loss and flow loss, etc.), which makes the transmission efficiency low.
3. Inaccurate transmission ratio: Due to factors such as the compressibility of the transmission medium, leakage, and elastic deformation of the pipeline, the hydraulic system cannot strictly guarantee fixed-ratio transmission.
4. Sensitive to temperature. The viscosity of oil changes with temperature. Changes in viscosity cause changes in flow, leakage and resistance, which can easily lead to unstable movement of the working mechanism.
5. High manufacturing costs. To reduce leakage, hydraulic components require higher manufacturing precision, thus increasing manufacturing costs.

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