Prepare before purchasing hydraulic wrench.Pneumatic impact wrench Wholesale

　　⑴ bolt specifications

　　Generally, there are several specifications, such as M36, M42, M48 (M is the representative symbol of common thread, 36, 42, 48 is the nominal diameter of the bolt). , the opposite side of the nut hex for M36 is 55, M42 is 65, and M48 is 75. If the bolt specifications are too relevant, two different types of hydraulic wrenches should be used.

　　⑵ Bolt torque

　　Hydraulic wrench torque comparison table, torque size is the most critical parameter for selecting hydraulic wrench, different bolts have different torques, the same bolt material has different torques, and the same material has different torques under different working conditions. It is used for bolt torque on rolling mill equipment and chemical equipment It is different. The general design drawings will give the torque size. If not, the corresponding standard number will be given. For example, heavy machinery and equipment use the national standard - JB/T5000.10-2007, such as 8.8 grade M42 bolts. The torque is 2806Nm, M36 is 1749Nm, M48 is 4236Nm, and one type of wrench can be selected for the above three bolts. According to the safety factor of 1.5 times the tightening torque and 1.25 times the bolt removal, the maximum torque of the hydraulic wrench should be greater than 4236x1.5x1.2=7942Nm.

　　(3) Spatial position of bolt and nut

　　A. If there is no space limitation, any type of wrench can be used. At this time, the drive shaft type hydraulic wrench is the most economical;

　　B. If the thread exposed after the bolt is tightened is long, it is best to use a hollow hydraulic wrench, otherwise a special extension sleeve should be equipped;

　　C. If there is limited space on the bolt, it is best to use a hollow hydraulic wrench;

　　D. If the nut is close, the hydraulic wrench of the drive shaft type can be used;

　　E. In special circumstances, it is recommended to consult Boting engineers.

　　2. Brand comparison, price comparison procurement

　　The price is the most important, the price is too low, a set of several thousand yuan, there must be a problem with the quality, expensive is not necessarily good, but cheap is definitely not good, such as a set of 10000Nm wrench, with different pumps, sockets , the price is from more than 30,000 to more than 80,000. It is normal within this range. If the price is higher than this, it is either purely imported, and the highest is about 150,000. No matter how high it is, it is outrageous.

　　There are also after-sales services. Many manufacturers often send hydraulic wrenches back to the factory for repairs. In this case, most of them are agents. They do not have the ability to repair on site. Moreover, they call to inquire about the hydraulic wrench, but they are not clear.

　　3. Other matters needing attention

　　A. One type of hydraulic wrench can only solve several similar bolts. Generally, it is equipped with 3-4 sockets. The hydraulic wrench is not a universal wrench. Many manufacturers deliberately exaggerate the range of bolts in their promotional materials and give you more matching cylinders. , but these sleeves are basically useless, which will only greatly increase the procurement cost;

　　B. For qualified manufacturers, it is best to use one electric pump with two wrench heads. Use diagonally, which can improve the efficiency and the torque is more accurate. The cost of one for four is too high;

　　C. The use of the hydraulic wrench should be kept by a special person, used by a special person, and maintained regularly, such as oil change, cleaning, etc. Only in this way can we ensure the normal operation of the hydraulic wrench when we use it. The customers of Botin hydraulic wrenches have done a good job in this regard, which is one of the reasons for the low maintenance rate of our hydraulic wrenches.

　　D. The bolt torque standard should be based on the national standard. Don’t believe in German-made or American-made ones. There is still a certain gap between their standards and domestic conditions. Due to domestic conditions, the national standard is in line with China’s national conditions.

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