Vibrating screen manufacturers explain the safety operation rules of high-frequency vibrating screen

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The vibrating screen can only be operated in accordance with the correct safety regulations in the process of use to ensure the normal operation of the equipment. Today, the vibrating screen manufacturer will introduce to you what are the safety operation regulations of the high-frequency vibrating screen that we need to abide by!

Precautions for the installation of high-frequency vibrating screen

Linear Vibrating Screen

(1) When the vibration exciter is installed and repaired, it must not be beaten hard or be different, and ensure that the original bearing is used and not interchangeable.

(2) The thickness and quantity of the eccentric block or counterweight plate attached to the eccentric block must be the same, and the radial clearance of the bearing should be C3 grade.

(3) The connection between the universal joint and the vibration exciters on both sides must be concentric, the eccentric blocks on both sides are in the free plumb position, and the universal joint connecting bolts can pass through smoothly; if there is any deviation during installation, check the universal joint Whether the joints at both ends of the section are concentric, do not swing the eccentric block angle for installation.

(4) The vibrating screen should be installed with springs with the same stiffness. The spring stiffness on both sides of the feeding end and the discharging end should be as consistent as possible, and the allowable height difference does not exceed 3mm.

(5) Both sides of the support seat of the rubber spring of the vibrating screen should be in the same horizontal plane, and the error is between 2-4mm to ensure that the materials on the screen surface advance evenly.

(6) When using electric welding to install or disassemble parts, the ground wire must be directly fixed on the workpiece to be welded and as close as possible to the welding point, and the welding current must not pass through any bearings or joints.

(7) In principle, welding should not be carried out on the side plate. According to the current environment, if connecting components are required, the side plate should be drilled and then connected with bolts.

(8) Universal joints must be concentric, and protective devices must be installed to prevent them from breaking and falling out and hurting people.

The use of high-frequency vibrating screen precautions

High frequency dehydration vibrating screen

1. Understand equipment related knowledge

The operator should ensure that the operator understands the scope of use and technical performance parameters of the equipment; has sufficient understanding and mastery of the structure, principle and maintenance knowledge of the equipment; familiar with the process flow and equipment control of the system; keep in mind the high-frequency vibrating screen Safe operating procedures.

2. Check before operation

(1) The area around the equipment should be checked to ensure that no personnel are left behind to avoid personal injury when the machine is turned on.

(2) Check whether the feeding, discharging chute and under-sieve chute are unblocked.

(3) Check whether the sieve plate and bead bolts are loose, and the wear of the sieve plate.

(4) Check whether the V-belt and flexible sheet are in good condition, whether the tightness is appropriate, and whether there is damage. If there is damage, it should be replaced in time.

(5) Check the connection between the universal joint and the connecting bolts of the transition pressure plate, and check whether the rubber spring is damaged.

(6) Follow the sequence of the process system to ensure that the empty screen is started and all safety equipment is in a safe and operable state.

(7) The vibrating screen must be started under no load, and the material can be fed after the amplitude is stable.

3. Observation during operation

(1) Observe the distribution of materials on the screen, and make appropriate adjustments if necessary to ensure uniform distribution of materials on the screen.

(2) Observe whether the vibration frequency and amplitude of the vibrating screen are abnormal and whether the operation is stable.

(3) Check the temperature of the motor, vibration exciter and transmission bearing seat.

(4) Observe whether there are abnormal noises such as collision and knocking during the operation of the vibrating screen. If it is found, it must be stopped in time.

(5) Check the vibration reduction of the rubber spring.

(6) Under normal operating conditions, the bearing temperature should not exceed 45 degrees.

4. Parking precautions

(1) The amplitude of over-resonance of the vibrating screen during startup and shutdown is 5 times of normal, and it should not exceed 8 times.

(2) In any case, as long as an accident occurs, the operation of the equipment should be stopped before contacting the centralized control room and relevant positions.

(3) Under normal circumstances, the sequence of the process system should be followed, and the vibrating screen should be stopped under no load, and must not be stopped with materials.

(4) Pay attention to the large-amplitude swing when parking to ensure the safety of the equipment, and remember to abide by the safety operation rules of the high-frequency vibrating screen.

Precautions for maintenance of high frequency vibrating screen

Linear vibrating screen

(1) After replacing the drive belt, it is necessary to recheck whether the outer end faces of the two pulleys are on the same level.

(2) After the overhaul is completed or the electrical components are replaced, the steering must be checked to ensure the safe use and operation of the vibrating screen.

(3) After the overhaul of the equipment is completed, the vibration exciter must be turned by hand, and the main shaft should rotate flexibly without friction and jamming.

(4) Regularly check the connection parts of each bolt, which must be firm and reliable, and all bolts must not have any looseness.

(5) Regularly check the wear and tear of the sieve plate.

(6) Check the side plates and beams of the vibrating screen once a month.

(7) Regularly check the rubber spring, V-belt, flexible connecting piece and universal joint.

(8) Lubricate each lubricating point and replace the lubricating oil according to the equipment requirements.

(9) Overhaul the vibrating screen once a year, remove all the vibrating screens for cleaning and oil change, carry out a single careful inspection of the bearings, and replace them if necessary.

The above is a very detailed introduction to the safety operation rules of high-frequency vibrating screen, mainly about the operation rules of installation, use, maintenance and other aspects. We can make a relevant understanding. At the same time, if you encounter any problems in operation, you can contact us.

Analysis of the causes and solutions of large vibration of vibrating screen

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In mining and other industries, it is necessary to use vibrating screen to screen materials. When the vibrating screen is used, it has a strong exciting force, and the material is also screened because of this exciting force. After using the vibrating screen for a period of time, the screen machine may have a problem of large beating. If the beating is serious, it may cause the side plate to break. Therefore, when this phenomenon is found, it should be solved immediately, but the first thing is to analyze the cause.

The reason for the large vibration of the vibrating screen

High frequency dehydration vibrating screen

1. The damping spring has high hardness
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If the hardness of the vibration damping spring is too large, it may not be able to achieve the effect of buffering, so the vibration screen will have a problem of large beating when it is running. Because the function of the damping spring is to connect the screen base and the screen frame, and it can also play a buffering role. Therefore, the hardness of the damping spring should not be too large.

2. Bearing radial clearance problem

If the radial clearance of the vibrating screen bearing is too small or too large, the bearing system will generate large vibration, and the whole vibrating screen machine will show a large beating phenomenon. When the radial clearance is too small, it will cause high frequency vibration; when the radial clearance is too large, it will cause low frequency vibration. If the radial clearance is too large, the radial natural frequency of the bearing elastic system will be reduced, resonance will easily occur, and large low-frequency vibration will be generated.

The main reason is that a large acceleration occurs at the impact point of the rolling element and the ferrule. In the early stage of the shock, a high-frequency compression wave irrelevant to the mass of the equipment and the shape of the object is generated and transmitted to the inside of the metal; while in the later stage of the shock, a mechanical vibration with a lower frequency than the shock compression wave is generated by the mechanical force. Therefore, the radial clearance is large, which increases the vibration of the bearing in the passband.

3. Exciting force is too strong

The vibration motor of the vibrating screen provides exciting force to the equipment during operation. If the motor power and model do not match, it may cause large jump or displacement during use. In order to increase the screening output or accuracy, some customers may adjust the motor excitation force to exceed the rated range, which may also cause the vibrating screen to vibrate violently.

Arc vibrating screen

4. The outer ring and the supporting hole are too tight

The cooperation between the outer ring and the support hole will affect the transmission of vibration of the vibrating screen. If the fit is relatively tight, it will force the raceway to deform and increase the shape error, resulting in an increase in vibration and a large jump. A looser fit can hinder the oil film in the gap. When the material properties of the outer ring and the bearing hole of the bearing seat are quite different, especially if the rubber damping ring is placed between them, the vibration transmission will be suppressed.

5. Improper installation of screen machine

When installing the vibrating screen, if the ground is uneven or improperly installed, it may cause excessive vibration, which will cause the vibrating screen to jump greatly.

6. Motor steering is inconsistent

The vibrating screen with double vibrating motor will adjust the steering of the motor when it leaves the factory, but when the motor is worn or damaged, if the motor rotation or power is inconsistent when the user replaces the motor, it may cause the vibrating screen machine to vibrate violently.

7. Loose anchor bolts

If there is abnormal vibration caused by uneven ground, it is necessary to check whether the anchor bolts are loose. Under the action of vibration, the long-term work of the vibrating screen will loosen the anchor bolts of the fixed base, which will cause the vibrating screen to vibrate too much during operation.

The solution to the large vibration of the vibrating screen

Linear vibrating screen

1. Users can solve the problem caused by excessive spring hardness by choosing high-quality springs.

2. If the user wants to adjust the exciting force, it needs to be adjusted within the range that the motor can bear. You can consult the manufacturer, or ask the technicians to purchase a model that is reasonable based on the properties of the materials provided, screening requirements, and output requirements.

3. When installing the vibrating screen, it should be noted that it needs to be installed according to the steps, and preparations should be made before installation, then install the support or hanging device, connect the screen box to it, and then install the motor and triangle tape to fix the screen surface. Note that debugging work is required to enter normal operation.

4. When the motor steering is inconsistent, it is necessary to consult a technician to re-adjust and install the vibration motor steering or eccentric block.

5. If the vibration screen jumps greatly due to the loosening of the anchor bolts, it is only necessary to tighten the anchor bolts.

The above is the introduction of the reasons for the large vibration of the vibrating screen and the solutions. There are seven main reasons for the large vibration, such as high hardness of the vibration damping spring, too small or too large radial clearance of the bearing, too strong excitation force, Loose bolts, etc., need to be solved according to the cause. For example, if the anchor bolts are loose, the anchor bolts need to be tightened.