Structure of support device and vibration isolation device of vibrating screen
Vibrating screen is a kind of screening machine with a wide range of applications. As one of the important components of the sieve-the role of the vibration isolation device in the screening process is very important. This article will analyze and introduce the structure of the vibrating screen’s supporting device and vibration isolation device in detail.
There are two types of support for the vibrating screen: hanging type and seat type. The hanging device used in the hanging type includes spiral compression spring, steel wire rope, anti-swing hammer, lifting ring, steel rope clamp and other parts.
The sieve is hung on the upper floor through four sets of hanging devices. The inclination of the screen surface can be adjusted by changing the length of the wire rope. The anti-swing hammer is installed above the wire rope, and its function is to prevent the screen box from swinging laterally. Changing the position of the anti-sway counterweight on the rope can change the natural frequency of the wire rope to prevent resonance and achieve the purpose of anti-sway.
The seat support device is composed of springs, upper and lower spring supports, positioning blocks, sieve box trunnions and friction dampers. The upper spring support is connected with the trunnion of the screen box. When the metal spiral spring is used to reduce vibration, a vibration reduction friction damper is provided under the support. The damper is composed of bolts, springs, rubber blocks and rubber seats. The damper is adjusted by adjusting the bolt, so that the spring is compressed from a free height of 170mm to about 30mm. Observe the situation of the sieving machine passing the resonance zone, and adjust repeatedly until the amplitude is relatively small and the sieve stops more smoothly when passing the resonance.
In the vibrating screen, the damping spring is both the main vibration spring and the vibration isolation spring. The elastic elements in the vibration isolation device have various forms such as metal coil springs, rubber springs, composite springs and gas-filled springs.
The functions of the vibration isolation device are:
① The natural frequency of the system is a function of the spring stiffness and the vibrational mass. When the sieve mass is determined, the natural frequency of the vibration depends on the spring stiffness. Therefore, the spring stiffness determines the working state of the elastic system and the stability of the screening machine.
② The spring stiffness is large, and the dynamic load transmitted to the foundation is also large. Therefore, proper selection of the spring stiffness can reduce the dynamic load transmitted to the foundation.
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