You Need a Electric Wrench ！

(1) Brief description

The product name and model of the electric wrench are different, and the range of use is also different. Here is a constant torque electric wrench for reference.

Constant torque electric wrench is an electric wrench that can automatically control torque. It is suitable for bridge structures, large steel towers, steel structure workshops, metallurgical equipment frames, large crane frames, mine steel frames and other projects that require high-strength bolt connections, and large diesel engines, power generation equipment, and chemical equipment. Bolts connected by clamping force can also be tightened with a constant torque wrench.

Especially in modern bridge construction, constant-torque electric wrench is an effective tool to realize the replacement of "rivet-welded beam" with "bolt-welded beam". This has great significance for simplifying the site installation procedures, reducing bridge construction costs, and reducing labor intensity, thereby accelerating bridge construction.

The torque of the fixed torque electric wrench is controlled by an electric device. The electric wrench has the advantages of low power consumption, low noise, flexible adjustment, automatic shutdown, and stable torque.

The 120kgf • m constant torque electric wrench designed and manufactured by China is a kind of wrench with static torque structure. It can be used as a final tightening tool for high-strength bolts, that is, the newly tightened bolts are tightened to the specified torque.

The electric wrench is a hand-held power tool for loading and unloading threaded connectors. It is widely used in assembly work of automobiles, tractors, electrical appliances, power machinery, valves, water pumps, textile machinery and other manufacturing industries, in chemicals, cement prefabricated parts, plastic molding, etc. During operation, it is used for demoulding of vacuum tanks, reactors and cement formwork, threaded plastic parts in the production process; it can also be used in railways, bridges, constructions and other projects as concrete sleepers, truss nodes, angle steel scaffolding and other structures Installation, maintenance and disassembly work.

(2) Principle

When the end face of the nut contacts the end face of the workpiece, the resistance moment rises sharply, and the rotating spiral groove makes the ball move with the active impact block to overcome the friction and the pressure of the working spring to move backward, so that the active impact block and the driven impact block mutually mesh. Teeth disengage. At this time, the driven impact block does not move, while the active impact block continues to move backward. After the teeth of the driven impact block are rotated, the active impact block is moved forward instantaneously due to the action of the working spring, and an angular acceleration is generated along the spiral groove. The active impact block hits the driven impact block, and the two teeth collide. Then the spiral groove moves the ball and the active impact block back to disengage. In this way, collisions occur again and again to obtain the required impact torque to tighten the nut.

If the power switch is connected to the reverse position, the nut can be unscrewed. Double insulated single-phase series excited electric wrench is equipped with two switches on the operating handle. One is a work switch, which is operated to start and stop; the other is only set to change the forward and reverse of the armature. The two switches cannot be reversed.

(3) Structure

There are two types of electric wrenches: safety clutch type and impact type.

The safety clutch type is a structural type that uses a safety clutch mechanism that trips when a certain torque is reached to complete the assembly and disassembly of the threaded parts; the impact type is a structure that uses an impact mechanism to complete the assembly and disassembly of the threaded parts with its impact torque. The former is generally suitable for the manufacture of electric wrenches of M8mm and below due to its simple structure, small output torque and a certain reaction torque; the latter has a complex structure and high manufacturing process requirements, but its output torque is large and reaction torque Very small, generally suitable for making larger size electric wrenches.

The impact electric wrench is composed of a motor, a planetary gear reducer, a ball spiral groove impact mechanism, a forward and reverse power switch, a power connection device and a motorized sleeve.

Impact type electric wrenches are single-phase series-excited electric wrenches and three-phase electric wrenches according to the type of motor selected.

The motor of the single-phase series-excited electric wrench is housed in a plastic housing. The plastic casing is used both as a structural part supporting the motor and as an additional insulation for the motor stator. When the impact type electric wrench is used to assemble or disassemble the screw, there is a large axial tension between the end face of the plastic housing of the device motor and the plastic front cover of the device planetary gear reducer and ball spiral groove impact mechanism, as well as the planetary gear. The reducer requires high assembly accuracy, so metal inserts are set at the plastic housing's mouth, bearing room and threaded joints to enhance the rigidity of the casing, improve the processing accuracy of the plastic casing and the axial force at the joint. ability.

(4) Precautions for use，The Impact Wrench factory  hopes to help you.

1) Before the tool is powered on, you need to check that the switch is off before you can insert it.

2) Confirm whether the power supply on site matches the voltage required by the electric wrench and whether there is a leakage protector.

3) Select the matching sleeve according to the nut size and install it properly.

4) The voltage is too high or too low.

5) Do not use Simplified Chinese as a hammering tool.

6) Don't add force after adding a lever or pry bar to the joystick.

7) The metal shell of the electric wrench needs to be reliably grounded.

8) Check the tightening of the mounting screws on the body of the electric wrench. If you find that the screws are loose, tighten them immediately.

9) Check whether the handles on both sides of the hand-held electric wrench are intact and whether the installation is firm.

10) When standing on a ladder or working at a high place, take measures to prevent falling from a high place.