Electromagnetic Sieve Vibrator

What is an electromagnetic sieve vibrator?

Electromagnetic sieve vibrator is a key component that uses electromagnetic force to drive the vibration of screening equipment. It is widely used in various screening machines, especially for the screening of high-precision powders and granular materials. Through the principle of electromagnetic induction, the electrical energy is converted into high-frequency vibration, which drives the screen to achieve precise screening and adapts to the full range of 20-500 mesh screen requirements. Electromagnetic sieve vibrator is used for low-mesh coarse screening (such as 20-40 mesh), the excitation force and frequency can be adjusted to ensure that large particles pass through the screen quickly; for high-mesh fine screening (such as 325-500 mesh), it can provide a stable and high-frequency vibration source, and cooperate with the ultrasonic auxiliary system to effectively prevent fine powder from blocking the screen and ensure screening efficiency and accuracy.

The device generates an alternating magnetic field in the electromagnetic coil through an alternating current, attracts and releases the matching armature system, and forms continuous high-frequency mechanical vibration. The vibration frequency is generally 3000 times/minute (50Hz) or 3600 times/minute (60Hz), and the amplitude is adjustable.

How does the electromagnetic sieve vibrator work？

The working principle of the electromagnetic sieve vibrator is based on electromagnetic induction. Usually, it contains an electromagnetic coil (or electromagnet) and a movable armature (or vibrating body), which are connected by a spring. When alternating current passes through the electromagnetic coil, a periodically changing magnetic field is generated. This changing magnetic field produces attraction and repulsion on the armature, causing the armature to reciprocate at a certain frequency and amplitude, thereby driving the screen to vibrate. The core of the electromagnetic sieve vibrator is to convert electrical energy into vibration energy to achieve material screening. It is mainly composed of electromagnetic coils, armatures, springs and other components. 

After power is turned on, the electromagnetic coil generates an alternating magnetic field, attracting the armature to move in the direction of the coil; when the power is turned off, the magnetic field disappears, and the armature is reset under the elastic force of the spring. Repeatedly, the armature will generate high-frequency reciprocating vibration.

This vibration is transmitted to the screen surface through the transmission mechanism, driving the screen to vibrate at high frequency, causing the material on the screen surface to continuously jump and roll, and particles smaller than the screen aperture pass through the screen to achieve graded screening.

Features of electromagnetic sieve vibrator

Electromagnetic sieve vibrator supports the full range of 20-500 mesh screens. The coarse mesh (20-100 mesh) screening can quickly process large particles. The fine mesh (325-500 mesh) screening is matched with the ultrasonic system, which can effectively solve the problem of screen blocking of ultrafine powder (such as below 45μm). It is suitable for powder, granular materials and other materials. It uses the principle of electromagnetic induction to generate high-frequency reciprocating vibration to adapt to the screening needs of different mesh sizes.

High screening efficiency: high-frequency vibration helps materials to quickly stratify and pass through the sieve holes, especially for fine, sticky or difficult-to-screen materials.

High frequency and low amplitude: electromagnetic vibrating screens usually have a higher vibration frequency (e.g. 3000-3600 times per minute) and a smaller vibration amplitude, which helps to improve screening efficiency, especially for fine particle materials.

Adjustable amplitude: The amplitude of the vibrator can be easily adjusted through the controller to adapt to the needs of different material characteristics and processing volume, and achieve accurate feeding or screening.

Precise control: The vibration amplitude and frequency are adjustable, which can be optimized according to material characteristics and process requirements to achieve accurate screening or feeding.

Technical parameters of electromagnetic sieve vibrator

Model	Applicable screen frame diameter	Vibration frequency	Maximum number of screens	Adjustable amplitude	Power	Voltage	Dimensions (mm)	Remarks
DH-200	Φ200mm (8 inches)	3000 times/minute	8 layers	Yes (mechanical knob)	50W	220V/50Hz	400×300×400	Laboratory standard screen vibrator
DH-300	Φ300mm	3000 times/minute	6 layers	Yes	80W	220V/5 0Hz	450×350×450	Can be used for medium batch material screening
DH-315 (reinforced type)	Φ315mm	3000 times/minute	6 layers	Yes	100W	220V/50Hz	480×370×480	Enhanced stability design

The difference between electromagnetic sieve vibrator and ultrasonic test screen

Comparison items	Electromagnetic screen vibrator	Ultrasonic test screen
Picture
Vibration principle	Electromagnetic force drives the armature to generate high-frequency mechanical vibration	Use high-frequency ultrasonic oscillator to transfer vibration energy to the screen
Vibration frequency	Generally 3000~3600 times/minute (50~60Hz)	Up to 18,000~40,000 times/second (18~40 kHz)
Amplitude range	large amplitude, generally 0.5~1mm, adjustable	extremely small amplitude, usually within a few microns
Main uses	laboratory particle size detection, electromagnetic powder, light powder screening	fine powder (such as nano powder, metal powder) screening, anti-blocking net
Applicable mesh range	20 mesh~200 mesh (general)	100 mesh~600 mesh and above high-precision screen
Applicable material characteristics	ordinary powder, granules, easy-flowing granules	fine powder, light powder, agglomerated powder, statically charged materials

The structure of the electromagnetic sieve vibrator

The electromagnetic coil (excitation coil) is wound by enameled copper wire, and generates an alternating magnetic field through alternating current. It is the driving core of the vibrator; the metal part of the armature (moving iron core) attracted by the electromagnetic force is periodically attracted and released under the action of the magnetic field to generate mechanical vibration

The fixed iron core (stator) cooperates with the armature to generate a magnetic circuit loop, which is a key component for forming electromagnetic attraction; Spring sheet or rubber shock-absorbing pad ensures that the armature can be quickly reset after being attracted, and plays a shock-absorbing and buffering role between the armature and the base

The base (machine base) carries the basic frame of all parts, usually made of cast iron or thick steel plate, with high stability; vibration guide plate (vibration table) transmits the vibration of the vibrator to the test screen, directly driving the screen body to vibrate

Amplitude adjustment device:Change the vibration intensity by adjusting the air gap, spring stiffness or voltage (some models have); power input interface generally 220V AC input, used with the controller

What is the purpose of the electromagnetic sieve vibrator?

Electromagnetic sieve vibrator is a device that generates high-frequency vibration through electromagnetic drive. It is mainly used to drive laboratory or small industrial screening equipment to make the screen vibrate continuously, thereby realizing the screening, grading or detection of powder or granular materials.

In the chemical industry, the electromagnetic sieve vibrator can finely screen 325 mesh titanium dioxide to ensure the consistency of powder particle size and improve the uniformity and hiding power of the coating. The high-frequency vibration of the electromagnetic sieve vibrator combined with the ultrasonic function can effectively avoid fine powder blocking the screen and ensure screening efficiency. In food processing, flour mills screen wheat flour with 100-200 mesh to remove impurities and agglomerate particles to ensure product quality and safety. The stable vibration frequency and amplitude of the electromagnetic sieve vibrator can quickly screen the flour without destroying the fineness of the flour.

In the laboratory, the electromagnetic sieve vibrator performs particle size analysis on scientific research samples. Screens from 20 mesh to 500 mesh may be used. The adjustability and accuracy of the electromagnetic sieve vibrator can meet the screening needs of different mesh sizes, making the experimental data more reliable.

Process flow of electromagnetic sieve vibrator

The process flow of electromagnetic sieve vibrator (electromagnetic vibrating screen) mainly involves the screening, separation and processing of materials, and is widely used in the classification, impurity removal or filtration of powder, granular or liquid materials.

The material (powder, granular or liquid) is evenly placed on the top of the screening equipment through the feed port or hopper.

When the electromagnetic vibrator is powered on, it generates high-frequency electromagnetic excitation force (usually 3000 times/minute). The vibration is transmitted to the screen through the screen body, and the screen surface produces three-dimensional movement (horizontal, vertical and inclined), so that the material is evenly distributed on the screen surface and "jumps". The material is layered according to the particle size: particles smaller than the mesh aperture fall through the mesh into the lower collection container or the next level mesh; particles larger than the aperture remain on the mesh surface and are discharged through the discharge port.

Depending on the number of mesh layers (usually 1-8 layers), the material can be separated into 2-7 different particle size segments. The aperture of each layer of mesh decreases from top to bottom to achieve grading from coarse to fine.

Customer Cases of Electromagnetic Screen Vibrators

Electromagnetic screen vibrators are widely used in laboratories and are suitable for screening various powders and granular materials. For example, when screening lime powder in the laboratory, it can be used to remove particles that do not meet the requirements to ensure that the particle size distribution of the final product meets the standards. Due to its efficient screening capacity and good screening effect, it has been favored by many schools.

A university research institute uses an electromagnetic standard vibrating screen to screen various test materials, with an electromagnetic vibrator as the vibration source. Electromagnetic sieve vibrator can drive the base of the screen to vibrate, and then transmit the vibration to the standard test screen, so that the material vibrates at a high frequency on the screen surface. At the same time, the lower device can also spread the material to achieve efficient screening. The equipment can hold 1-7 layers of test sieves and can effectively screen, grade, and filter materials. It solves the problem of ultra-fine powder dry screening and can screen to 20um (635 mesh). It is widely used in scientific research units, laboratories, etc. in many industries such as food, medicine, chemical industry, and abrasives. It is used for inspection, screening, and particle size analysis of solids, powders, slurries, and other materials.

Electromagnetic sieve vibrator supplier

Electromagnetic sieve vibrator suppliers are mainly concentrated in the vibrating sieve equipment manufacturing industry, especially those serving laboratory testing equipment and powder screening equipment manufacturers. Not only can they provide standard models of electromagnetic vibrators, but they can also provide customized services according to the requirements of screen size, amplitude frequency, voltage environment, etc.

Usually they produce various particle size analysis equipment, such as test sieves, ultrasonic sieves, vibration platforms, etc., and can match screens of various sizes (Φ200mm, Φ300mm, Φ400mm, etc.). The electromagnetic vibrator models are complete (such as EM-3, ZD series, etc.), and support different frequencies and excitation forces. Meet the differentiated needs of different materials (such as metal powder, drug powder, food powder, soil samples, etc.) and different industries (pharmaceuticals, metallurgy, agriculture, scientific research, building materials) in terms of screening accuracy, cleaning standards, and ease of operation.