Before dyeing and printing textiles need to go through a certain scouring process to remove impurities and oil stains from the fabric. This scouring process is often referred to as scouring. And in the refining added with various types of infiltration, emulsification, washing, dispersion, wetting function of chemical additives, is called the scouring agent.
Scouring agent is to use chemical and physical methods to remove cotton, wool, hemp, silk and synthetic fiber and other kinds of textile natural impurities, dirt and weaving slurry process called scouring. Therefore, broadly speaking, in the process of refining added acid, alkali, oxidant, reducing agent and all kinds of surfactants and other chemicals can be called scouring agent.
Scouring agents, bleaching agents, Desizing agents Dymatic Chemicals, Inc. , https://www.dymachem.com
The linear vibrating screen is named for the directional linear vibration of the screen box, and because the vibrator has two axes, it is also called a biaxial vibrating screen.
The structure of the linear vibrating screen is shown in Figure 1. The two eccentrics of the vibrator are equipped with equal eccentric masses of the same eccentricity. A pair of gears with a speed ratio of 1 are coupled between the two shafts. Since the rotation directions of the two shafts are opposite and the speeds are equal, the centrifugal inertial forces (exciting forces) generated by the two eccentric masses cancel each other in one direction, and the resultant force of the centrifugal inertial forces in the direction perpendicular to this causes the screen box Vibration in a straight line. Because the vibration direction line has a certain angle of inclination with the horizontal plane, the screen box is usually installed horizontally and sometimes gently.
Linear vibrating screens are also available in both hanging and seated versions. Figure 2 shows the structure of a suspended linear vibrating screen using a box vibrator (Figure 3). The four eccentric blocks of the vibrator are arranged in two places outside the box, and there are two gears in the box, the first one is for transmitting motion, and the other is to ensure that the two pairs of eccentric blocks rotate in opposite directions, the rotational speed is equal, and the phase relationship between the two Just align with each other so that the centrifugal inertial forces cancel each other out in one direction. The box vibrator has a compact structure and is easy to install by hanging, but it has a large cross-section supporting beam and is relatively complicated to manufacture.
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Figure 5 shows a seat type linear vibrating screen using a barrel vibrator (Figure 6). The eccentric block of the vibrator is integrally formed with the shaft, and a pair of intermeshing gears are arranged at the end of the shaft to ensure a correct phase relationship with each other and to transmit motion. The barrel vibrator has the advantages of small height, low center of gravity, and convenient seat mounting, but the disadvantage is that the width is large.
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Both the box vibrator and the barrel vibrator have a pair of high-speed rotating gears, so the structure is complicated, and it is easy to leak oil with thin oil lubrication, and the bearing is also prone to heat, which increases the maintenance workload. To this end, a self-synchronizing two-axis vibrator (Fig. 4) was fabricated, the two axes of which were not coupled by gears, but were driven by two electric motors, respectively, and the two axes automatically maintained strict reverse synchronous rotation depending on the mechanical relationship.
The motor of the linear vibrating screen can be mounted directly on the screen box or separately. In order to prevent the amplitude from increasing rapidly when the speed is reduced to near the resonance speed, a reverse torque can be applied to the motor at this time, and the power is automatically cut off when the speed drops to zero.
Since the screen surface of the linear vibrating screen is linearly reciprocating, the upper layer is subjected to compaction during the jump and fall while moving forward, and is therefore particularly suitable for dewatering, desliming, deliquoring and heavy medium. when the removal of heavy media beneficiation, more coal plants in selected applications.