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Hydraulic wrench is a hardware tool commonly used in our daily life. It is a device used to pre-tighten and remove large bolts. So, how much do you know about hydraulic wrenches? Do you know the working principle of hydraulic wrench? What are its structure? How to choose the right hydraulic wrench?

1. Working principle of hydraulic wrench

The hydraulic wrench is based on the hydraulic principle. It uses the special pump station power source of the hydraulic torque wrench to push the internal piston rod of the hydraulic torque wrench to do a back and forth push principle to pre-tighten and remove the bolts. Its torque is generally 112N.m. —72000N.m, often used to pre-tighten and remove bolts larger than one inch.

Two, hydraulic wrench structure composition

The hydraulic wrench consists of a working head, a hydraulic pump and a high-pressure oil pipe. The function of the high-pressure oil pipe is to act as a channel for the hydraulic pump to transmit power to the working head; and to drive the working head to tighten or loosen the rotating nut. As for the hydraulic pump, it can be driven by electricity or compressed air.

Three, how to choose the right hydraulic wrench

When choosing the right hydraulic wrench, pay attention to the following aspects:

1. When choosing a hydraulic wrench, fully consider the bolt specifications.

Common bolt specifications are M36, M42, M48. If you don't say how big the nut is, it is based on the opposite side of the metric bolt and nut accessory sleeve. The opposite side of the hex nut of M36 is 55, M42 is 65, and M48 is 75. If the bolt specifications are too relevant, two types of wrenches should be used.

2. Consider the bolt torque. Different bolts have different torques; similarly, different bolt materials have different torques; even the same material has different torques under different working conditions.

In addition, any type of wrench can be used when there is no space* system. Among them, the driven hydraulic wrench is economical and practical. However, when the thread exposed after the bolt is tightened is longer or the space above the bolt is limited, it is better to use a hollow hydraulic wrench at this time.