How to replace the high frequency screen
Writer： admin Time：2020-11-05 09:53 Browse：℃
High-frequency screen is also called high-frequency vibrating screen and high-frequency filter screen. It has the characteristics of reliable structure, strong excitation force, high screening efficiency, low vibration noise, sturdiness and durability, convenient maintenance and safe use. High-frequency vibrating screen is widely used Product classification in mining, building materials, transportation, energy, chemical and other industries. Today, the high-frequency screen manufacturer will give you a detailed introduction to the replacement of the high-frequency screen and what are the precautions for the inspection before operation? So that you can better understand the high-frequency screen.
1. The inspection before the operation of the high-frequency screen, this step is a very important step:
1. Check whether the type and specification you ordered are consistent;
2. Whether it is damaged or bruised during operation;
3. Whether the assembled power supply is consistent with the chrome brand mark, note: the voltage error should not exceed ±5%;
4. Are the fastening parts loose? The grounding wire must be installed firmly;
2. High frequency screen replacement method:
1. Loosen the six plastic head nuts and remove the upper hopper and net ring.
2. The fine mesh should be placed horizontally on the mesh ring.
3. Press the round rod tensioner from top to bottom into the bottom ring groove and lock it.
4. Repeat the above steps to press the retainer into the upper ring groove and lock it.
5. Use scissors to cut off the excess gauze.
Note: Under normal circumstances, the high-frequency vibrating screening machine has reserved wire heads for workshop wiring. According to the operation steps, when the vibrating motor is installed on the screen box, the eccentric blocks at both ends of the vibrating motor are not in one direction, but are clamped. Angle installation, and the motor structures on the left and right sides are exactly opposite. It is worth noting that the mating surface of the connection port thread and the motor junction box must be coated with sealant to prevent water from entering during the screening process. In addition, we need to pay attention to the adjustment of the exciting force. We all know that the size of the exciting force affects the screening efficiency and screening output of the material. Therefore, it is also very important to adjust the exciting force of the high-frequency vibrating screen. Adjusting the eccentric blocks at both ends of the vibration motor can adjust the excitation force of the vibration motor. The main reasons for the rapid damage of the high-frequency vibrating screen are due to the unqualified quality of the screen, the tension of the screen, the wrong direction of the vibration motor, and the accumulation of clay. The following solutions are shared with you:
1. The screen is not tight enough, which causes the screen to vibrate, which is usually broken or damaged along the edge of the screen or at the edge layer.
2. The quality of the screen is unqualified. The screen generally has an upper screen layer and a lower stress layer. The two layers are required to be closely attached. If the screen pre-tensioning process is poor, when the bottom of the screen is stressed When the layer is tightened, the sieve layer is not tightened, and the throwing force of the drill cuttings during operation is greatly reduced, and the drill cuttings cannot be discharged.
3. The steering error of the vibrating motor. When debugging the steering of the vibrating motor, based on the previous experience of using a single-axis vibrating screen or a linear vibrating screen, the on-site operator believes that as long as the drill cuttings move forward, this method is not suitable for the horizontal elliptical vibration screen. If the motor rotates to the inside by mistake, the ejection angle is also forward 45°, but the drill cuttings have a backward rolling force. At this time, the forward movement speed of the drill cuttings will be much slower, and it will stay on the screen for a long time. As a result, drill cuttings cannot be discharged.
Reasons for rapid damage of high frequency vibrating screen:
The vibration amplitude of clay accumulation is too small, it is difficult to screen under the condition of polymer drilling fluid, and the viscous force of drill cuttings (clay) cannot be effectively overcome, resulting in accumulation of drill cuttings on the screen and rapid damage to the screen.
The main reason for the rapid damage of the high frequency vibrating screen is due to the unqualified quality of the screen, the tension of the screen, the wrong direction of the vibration motor, and the accumulation of clay. The following solutions are shared with you:
1. The screen is not tight enough, which causes the screen to vibrate, which is usually broken or damaged along the edge of the screen or at the edge layer.
2. The quality of the screen is unqualified. The screen generally has an upper screen layer and a lower stress layer. The two layers are required to be tightly attached. If the screen pre-tensioning process is poor, when the bottom of the polyurethane screen is When the force layer is tightened, the sieve layer is not tightened, and the throwing force of the drill cuttings is greatly reduced during operation, and the drill cuttings cannot be discharged.
3. The steering error of the vibrating motor. When debugging the steering of the vibrating motor, based on the previous experience of using a single-axis vibrating screen or a linear vibrating screen, the on-site operator believes that as long as the drill cuttings move forward, this method is not suitable for the horizontal elliptical vibration screen. If the motor rotates to the inside by mistake, the ejection angle is also forward 45°, but the drill cuttings have a backward rolling force. At this time, the forward movement speed of the drill cuttings will be much slower, and it will stay on the screen for a long time. As a result, drill cuttings cannot be discharged.
Maintenance method of high frequency vibrating screen:
1. When the equipment is operating normally, the ore concentration of the sieve should be observed frequently, and the concentration should be controlled at about 40% in order to improve the classification efficiency.
2. Because the sieve has high grading efficiency, good dewatering performance, and high concentration on the sieve, the slurry in the chute on the sieve has poor fluidity and should be equipped with water pipes.
3. The electromagnetic exciter and the control box must be protected from water to avoid short circuit. The vibration exciter should be covered with a rubber sheet to prevent water and ore slurry from falling into it, causing short circuits and blocking the air gap.
4. Check whether the bolts of each part are loose and whether the screen frame collides with the chute at any time.
5. Always pay attention to the ammeter pointer not to exceed the rated value. When the sieve machine runs for about half a month, the current and current should be adjusted to the near rated value (usually 8-9A) and vibrate for 4-5 minutes to shake off the objects on the back of the screen.
6. The excitation current (amplitude) can be adjusted according to the nature of the ore and the requirements of the operation. In order to make the screen work under the highest efficiency conditions, the excitation current condition test can be done.
7. After the sieve has been used for 1 month, remove the sieve and perform a 180° U-turn to enhance the "cutting" effect of the sieve bar in order to improve the classification efficiency.
8. When the slurry hopper into the sieve jets too far, the position or angle of the sieve frame should be adjusted in time to avoid affecting the classification efficiency.
High frequency screen, also known as high-frequency screen, has the characteristics of high efficiency, small amplitude, and high screening frequency. Different from the principle of ordinary screening equipment, due to the use of high frequency, the use of cylindrical eccentric shaft vibrator and partial block amplitude modulation, the centrifugal inertia force of the unbalanced weight on the vibrator makes the screen box vibrate, the material screen line is long, the screen There are many specifications. On the one hand, it destroys the surface tension of the slurry and the high-speed oscillation of the finely divided materials on the screen surface, accelerates the formation of high-density useful minerals, and the separation effect increases the possibility of materials smaller than the separation particle size contacting the screen holes. . Thereby, better separation conditions are created, so that materials with a smaller particle size, especially materials with a larger proportion, pass through the sieve together with the slurry and become under-sieve products. Adopting the principle of resonance, the two-component critical resonance state works, the driving power is small, there is no large starting current when starting, the noise is low, the efficiency is high, the amplitude is small, and the shielding frequency is high.
