Torque wrench is also called torque wrench. Torque is the product of force and distance. When tightening threaded fasteners such as screws, bolts and nuts, it is necessary to control the applied torque to ensure that the threads are tightened and will not damage the threads due to excessive torque, so it is operated with torque wrench. First, set an upper limit of the required torque value. When the applied torque reaches the set value, the wrench will make a "click" sound or bend a little angle at the wrench connection, which means that it has been tightened and no more force is added. Torque wrench can be divided into preset torque wrench, digital display torque wrench, dial torque wrench and slip torque wrench. Preset torque wrench, dial torque wrench and slip torque wrench are generally referred to as mechanical torque wrench.

虽然数显扭力扳手的性能优于表盘式扭力扳手,但是在上往往太高,如对于作业要求不是非常严格的行业,建议选择低的机械式扭力扳手。反之在一些对螺栓联结有较高要求的行业,尤其是在一些汽车、桥梁、航天航空、机械等行业中,因为数显扭力扳手的存在加大了各种产品的可靠性和紧密性。

Although the performance of digital display torque wrench is better than dial torque wrench, the price is often too high. For example, for industries with not very strict operation requirements, it is recommended to choose mechanical torque wrench with low price. On the contrary, in some industries with high requirements for bolt connection, especially in some automobile, bridge, aerospace, machinery and other industries, the existence of digital torque wrench increases the reliability and tightness of various products.

液压扳手对于大规格的螺栓的安装与拆卸都是一种较为重要的工具，在选购液压扳手时，螺栓的规格、螺栓的强度等级是液压扭矩扳手选型的关键参数，液压扭矩力扳手有驱动式液压扭矩扳手和中空式液压扳手两种，驱动式液压扭矩扳手配合标准套筒使用，为通用型液压扳手，适用范围广。中空液压扳手厚度较薄，特别适用于空间比较狭小的地方。适用于电力(核电、风电、水电、火电)、船舶、冶金、交通、水泥、建筑、航空等领域。今天小编就主要给大家介绍一下液压扭力扳手的选择及注意事项。

Hydraulic wrench is an important tool for the installation and disassembly of large bolts. When purchasing hydraulic wrench, bolt specification and bolt strength grade are the key parameters for the selection of hydraulic torque wrench. Hydraulic torque wrench includes driven hydraulic torque wrench and hollow hydraulic wrench. Driven hydraulic torque wrench is used with standard socket, It is a universal hydraulic wrench with wide application range. The hollow hydraulic wrench is thin in thickness and is especially suitable for places with narrow space. It is applicable to electric power (nuclear power, wind power, hydropower, thermal power), shipbuilding, metallurgy, transportation, cement, construction, aviation and other fields. Today, Xiaobian mainly introduces the selection and precautions of hydraulic torque wrench.

根据螺栓规格

According to bolt specification

一般有几种规格，例如M36、M42、M48，如果不说螺母多大，是按公制螺栓螺母副配套筒的对边，M36在的螺母六角对边是55，M42是65，M48是75。如螺栓规格跨度太大，而且扭矩跨度较大，那预紧这些螺栓就必然要选用两种型号扳手。

Generally, there are several specifications, such as M36, M42 and M48. If the nut is not large, it is the opposite side of the metric bolt and nut auxiliary cylinder. The opposite side of the nut hexagon of M36 is 55, M42 is 65 and M48 is 75. If the bolt specification span is too large and the torque span is large, two types of wrenches must be selected for pre tightening these bolts.

根据螺栓扭矩

According to bolt torque

提醒：螺栓的规格、螺栓的强度等级是液压扭矩扳手选型的关键参数,螺栓不同，扭矩不同，同样的螺栓强度等级不同扭矩不同，同样螺栓强度等级，不同工况的扭矩也不同，用于轧机设备和化工设备上螺栓扭矩是不一样的，一般的设计图 纸都会给出扭矩大小，如不给，会给出相应的标准号，如重型机器设备是采用国标—JB/T5000.10-2007,如8.8级M42的螺栓的扭矩为2744Nm；M36螺栓的扭矩为1764Nm；M48螺栓的扭矩为3920Nm；以上三种螺栓可以选一种型号的扳手。

Reminder: bolt specification and bolt strength grade are the key parameters for the selection of hydraulic torque wrench. Different bolts have different torques, the same bolt strength grade has different torques, the same bolt strength grade has different torques under different working conditions, and the bolt torque used for rolling mill equipment and chemical equipment is different. The torque will be given in general design drawings, If not, the corresponding standard number will be given. For example, the national standard JB / t5000.10-2007 is adopted for heavy machinery and equipment, for example, the torque of grade 8.8 M42 bolt is 2744nm; The torque of M36 bolt is 1764nm; The torque of M48 bolt is 3920nm; One type of wrench can be selected for the above three bolts.

根据螺栓、螺母空间位置

According to the spatial position of bolts and nuts

如果没有空间限制，哪个型号的扳手都可以使用；驱动式液压扳手为经济；如螺栓拧好后露出的螺纹较长或者螺栓上面有空间有限，好使用中空式液压扳手；如螺母间距离狭窄，可选用中空式液压扳手。

If there is no space limit, any type of wrench can be used; Driven hydraulic wrench is economical; If the thread exposed after the bolt is screwed is long or there is limited space on the bolt, it is good to use a hollow hydraulic wrench; If the distance between nuts is narrow, hollow hydraulic wrench can be selected.

其它注意事项

Other precautions

1）一种型号的液压扭力扳手，只能几种相近的螺栓，一般配1-10个套筒；

1) A type of hydraulic torque wrench can only solve several similar bolts, generally equipped with 1-10 sockets;

2）有条件的厂家是一个电动泵配两个扳手头使用，对角使用，可以提率，扭矩更准确；

2) The qualified manufacturer is an electric pump equipped with two wrench heads, which can be used diagonally to improve efficiency and more accurate torque;

3）液压扳手必须专人使用，专人保管，经常保养，如换油，清洗等；

3) The hydraulic wrench must be used and kept by a specially assigned person and maintained regularly, such as oil change, cleaning, etc;

4）螺栓扭矩标准应以国标为准，国标是符合国情的。

4) The bolt torque standard shall be subject to the national standard, which is in line with China's national conditions.

1、在开始的人们开始要先做的就是要确定这个拆松的动作，还是就是人们还要利用的就是用来锁紧螺母然后在通过该按下动作或旋出锁固螺钉。

1. At the beginning, what people have to do first is to determine whether the loosening action is used to lock the nut, and then press the action or screw out the locking screw.

2、在进行一些的取出驱动方轴在进行对他们的换向。

2. Take out the drive square shaft and reverse them.

3、在后来人们可以在它的上面装上一些有关的驱动方轴定位器，拉下反作用力臂锁固装置，按适合方位装入反作用力臂、确定拆松、锁紧工作时方轴方向。

3. Later, people can install some relevant driving square shaft positioners on it, pull down the locking device of the reaction force arm, install the reaction force arm according to the appropriate orientation, and determine the direction of the square shaft during disassembly and locking.

总结：液压扳手采用标准四方形驱动轴，配合不同规格套筒，适合多种场合应用,大限度的采用高强度轻金属,一体成型动力头，提高强度及寿命；较大的扭矩/重量比,双作用，高速,转角大，效率高, 360°×360°旋转软管接头使在狭小的空间内使用方便,不会出现机构卡死, 扭矩重复精度高达±3%,松开时不需其它工具,存贮箱保护扳手头避免损坏，浸水和污浊,运动部件少，经久耐用，维护方便。随着8.8级以上高强度螺栓的普遍使用，为使用联接和预紧达到设计要求，使得液压扳手成为必需。

Summary: the hydraulic wrench adopts standard square drive shaft, matched with sleeves of different specifications, which is suitable for various applications. It adopts high-strength light metal to a large extent and forms a power head in one, so as to comprehensively improve the strength and service life; Large torque / weight ratio, double acting, high speed, large angle, high efficiency, 360 ° × 360 ° rotating hose joint makes it easy to use in a narrow space without mechanism jamming. The torque repetition accuracy is as high as ± 3%. No other tools are required when loosening. The storage box protects the wrench head from damage, immersion and dirt. There are few moving parts, durable and convenient maintenance. With the widespread use of high-strength bolts above grade 8.8, in order to meet the design requirements for connection and pre tightening, hydraulic wrench has become necessary.

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The above is the torsion shear wrench Thank you for checking the information of our company in your busy schedule. If you want to know more, you are welcome to call for consultation!