The shock absorber is an ideal damping material, which can damp the vibration. It has great linear flexibility, can be almost stretched to fracture without losing its elasticity, and can withstand alternating stress without fatigue. Like water, it is almost incompressible, and only produces elastic deformation after compression, but its volume remains unchanged.
The compressive strength of is much greater than the tensile strength. The tensile length of is generally about 6 times larger than the compression distance. The natural vibration frequency is not the same under tension or compression. These physical characteristics of the shock absorber will affect the design, selection and application of the shock absorber. Users should know more about and pay attention to the shock absorber when using it.
The crusher will be affected by various forces during operation, and vibration is a common force. The load acting on the body of the inertia cone crusher is the inertia force and inertia moment generated by the moving cone and the vibration exciter. This dynamic load is periodic and will cause the vibration of the crusher, which will lead to noise and unstable operation of the equipment. In serious cases, it will lead to damage to machine parts and shorten the service life of the machine. In order to ensure the normal operation of the crusher, it is easy to reduce the impact of vibration on the machine by isolating the vibration source.
The more feasible way to avoid vibration is to take measures to isolate the research object (such as equipment or foundation) from the vibration source, so that the vibration transmitted from the vibration source to the research object can be weakened or even eliminated. This method of isolating the vibration source from the research object is called vibration isolation.
Vibration isolation (referred to as vibration isolation) is the most widely used valve technology, which uses additional subsystems to isolate the source from the research object to reduce the impact of vibration sources. In engineering, vibration isolation is divided into active vibration isolation and passive vibration isolation for different vibration sources. When the research object itself is the vibration source, isolate it from the supporting platform to reduce the impact on the platform, which is called active vibration isolation; If the vibration source comes from the platform, the research object is isolated from the platform to reduce the impact on the equipment, which is called passive vibration isolation. Ball valve damper is widely used in the vibration isolation system of crusher. Shock absorber is also a kind of vibration isolation element commonly used in engineering. According to the force, the shock absorber can be divided into compression type, shear type, compression shear composite type, etc.
The greatest advantage of pneumatic ball valve is that it has a certain damping, has a good valve effect near the resonance frequency, and is suitable for vibration isolation in vertical, horizontal, and rotating directions. The stiffness has a wide range of options. Compared with steel ball valve, its disadvantage is that the isolation performance is easily affected by temperature, and its performance is poor when used at low temperature.
The static compression is low and the natural frequency is higher than 5Hz, so this kind of shock absorber is not suitable for equipment with low interference frequency (natural frequency lower than 5Hz) and heavy weight. Such products have been widely used in equipment vibration reduction engineering of industrial and civil buildings due to their convenient installation and obvious effect.
The key to design and select an isolator is to accurately estimate its stiffness and natural frequency so that the load is within its allowable range. In addition, it should be noted that the maximum compression under static load should not exceed 10% - 15% of the original length to ensure a certain service life.