The hydraulic system of medium and small hydraulic Excavator Spare Parts has a clear trend of changing to a variable system. Because the variable system compensates by increasing the flow rate when the pressure is reduced during the operation of the oil pump, the hydraulic pump power is kept constant, that is, the Excavator spare parts equipped with the variable pump can often fully utilize the maximum power of the oil pump. When the external resistance increases, the flow rate is reduced (the speed is reduced), and the digging force is multiplied; a three-circuit hydraulic system is used. Generate three independent work movements that do not affect each other. Achieve power matching with the slewing mechanism. The third pump is switched on in other working motions and becomes the second independent fast motion of the open circuit. In addition, hydraulic technology is commonly used on excavators, creating conditions for the application and promotion of excavators for electronic technology and automatic control technology.
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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>The essence of NSK bearing noise analysis The essential analysis of NSK bearing noise
(1) The rolling sound of the bearing and its control method The rolling track sound is a kind of slippery movement that is announced when the bearing is working; its rolling body is rolled on the raceway surface; it is the unique fundamental of all rolling bearings. Sound. The usual bearing sound is the raceway sound plus other movements. The ball bearing's raceway sound is irregular; the frequency is above 1000Hz; its main frequency does not change with the speed; but its total sound pressure level varies with the speed. Acceleration and addition. The bearing with large rolling sound; the sound pressure level of the raceway sound is reduced with the addition of viscosity, and the bearing with small rolling sound; the sound pressure level increases when the viscosity increases to about 20 mm 2 /s or more; From reduction to increase. The rigidity of the bearing seat is greater; the lower the total sound pressure level of the raceway sound. For example, the radial clearance is too long. The method of controlling the sound of the raceway is to select a low-noise bearing, that is, a bearing with a small waviness; carefully select the operating conditions. The raceway sound often affects the noise of the entire machine; Can reduce the noise of the entire machine. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
(2) Impact sound of rolling body and its control method Larger type of ball bearing or cylindrical roller bearing works under low speed under pure radial load; because the centrifugal force of the rolling body is apologetic to the 诜 汕 汕 汕 汕寤鞅3 芑蚬龅 Indigo 3. 鲈肷. But as the speed of rotation progresses; this movement will disappear. The control method of the roll impact sound is: properly reduce the radial clearance; use reasonable layout and the information has And the bearings of the sturdy cage.
(3) The rolling noise of the bearing and its control method The rolling sound is a sharp metal conflict sound that may occur in cylindrical roller bearings in all occasions; most of them occur in the larger type of bearing with smooth grease; Deteriorated smooth fat is more prone to attack; it does not occur when the oil is smooth. In addition; it is easy to attack in winter; when it receives pure radial load; it is easy to attack when the radial clearance is large; The same; it is easy to attack in a certain range of speed; it will be intermittent and intermittent. The special processing method of the outer ring raceway can avoid the appearance of rolling sound; if necessary, the bearing can be used; or cut appropriately The radial clearance of the bearing; the use of excellent smooth grease and the rigidity of the bearing with the bearing.
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Source: China Bearing Network Time: 2017-09-28