The invention of the wrench has been elusive, because even gorillas know how to use the lever principle to smash walnuts. With the development of technology and the needs of technology, various high-efficiency wrenches have been invented one by one. The invention of pneumatic wrench is undoubtedly a great advancement in the tool industry. Up to now, pneumatic wrenches have been used in all walks of life and are the main tool in the production line of mechanical products.
Components of air pneumatic wrench
The air wrench is generally composed of two parts, namely the air motor and the impact part. The pneumatic motor is composed of an eccentric cylinder, a rotor, moving blades, and a sealing cover. The main function is to convert Qi energy into kinetic energy. The impact hammering part is mainly composed of an inertial impact frame, an impact claw and a torque output shaft. The main function is to convert a constant torque into a pulse torque.
Working principle of air pneumatic wrench
The most common power of a pneumatic wrench is compressed air from an air compressor, and the air enters the cylinder chamber through the pipeline. Using the eccentric design of the cylinder, the airflow is sprayed on the moving blades of the rotating rotor to drive the rotor to rotate, and the moving blades are in close contact with the cylinder wall under centrifugal action
Dynamically isolate the air inlet and outlet. The rotor uses the pressure difference on the moving blades to generate rotation. The moving blades will pass through the exhaust hole at a certain angle, and the air flow discharged from the exhaust hole will simultaneously turn back to the cylinder chamber with the intake flow to form a high speed rotor. The constant torque generated by the air motor is transmitted to the inertial impact frame through the spline, which converts the constant torque into pulse torque, and generates high-strength torsional inertia. Thereby tighten or remove the screws.
The model of pneumatic wrench can be distinguished by the length of the blade installed on the inner rotor. If the length of the blade is different, the length of the rotor will also change, and the size of the cylinder will also change. Generally speaking, the longer the blade, the larger the rotor, the larger the cylinder required, and the greater the power of the pneumatic wrench.
There are generally two ways to adjust the torque of a pneumatic wrench, one is to adjust the air pressure and the other is to adjust the torsion spring. Near the interface of the air inlet connector, we will see a knob marked with 1234.... This is used to adjust the torque. Easily get quantity air pneumatic wrench from manufacturers .
Generally, the purpose of changing the torque is achieved by adjusting the intake air volume.
The development prospects of pneumatic wrenches:
Compared with electric wrenches, pneumatic wrenches have stronger operating capabilities. Under the same power, the power of the pneumatic wrench is stronger, and the pneumatic wrench is relatively lighter. Pneumatic wrenches are more suitable for long-term work. They will not be like electric wrenches. Once the working time is too long, they will generate heat. Compared with hydraulic wrenches, air wrenches do not require strict sealing and do not need to recover the power medium. Once the hydraulic oil leaks, it will cause environmental pollution.
Secondly, compared to electric wrenches, air pneumatic wrenches are more resistant to water. Even if they accidentally waded into the water, they will not be as harmful as electric wrenches. In addition, in terms of economy, electric wrenches consume more energy and higher maintenance costs.