Ro-Tap sieve shaker

What is a Ro-Tap sieve shaker?

Ro-Tap sieve shaker is a laboratory-grade precision screening equipment, mainly used for particle size analysis and material particle gradation detection. It is famous for its unique two-dimensional motion (horizontal circular motion and vertical tapping motion). Its core principle is to use the compound motion of rotation and vertical tapping to make the material produce efficient dispersion and screening effect on the screen surface, which is particularly suitable for scenes that require high-precision and repeatable particle size analysis.

What is the purpose of the Ro-Tap sieve shaker?

The Ro-Tap sieve shaker is used to perform particle size analysis by separating and sorting particles of a material sample into different size fractions. It agitates a stack of sieves with a rotating and tapping motion, allowing particles to pass through mesh openings based on their size. This process ensures accurate and reproducible results for quality control, research, or material characterization in industries like construction, pharmaceuticals, and mining.

Ro-Tap sieve shaker video

What is the principle of Ro-Tap sieve shaker?

The unique working mode of Ro-Tap sieve shaker lies in its dual motion:

Horizontal circular motion: The device produces a rotating motion in the horizontal direction, which disperses and moves the sample on the sieve surface, increasing the contact opportunity between particles and the sieve mesh.

Vertical tapping motion: A top tapping hammer will tap the sieve frame at a certain frequency, which helps particles stuck in the mesh to loosen and pass smoothly.

The combination of these two motions simulates the rotation and tapping action of manual sieving, but is more stable and efficient, and can provide more reliable particle size analysis results.

What is the difference between Ro-Tap Sieve Shaker and Sieve Shaker?

Comparison item	Ro-Tap Sieve Shaker	Sieve Shaker
Image
Movement mode	Rotation vibration + tapping (double action)	Horizontal or vertical vibration only
Anti-blocking net ability	Very strong (tapping to clear the net)	Easy to block, need to be cleaned manually
Screening accuracy	High	General (depends on operating experience)
Applicable particle size range	20μm~25mm (ultra-fine powder requires airflow assistance)	50μm~10mm (more suitable for coarse particles)

What is the disadvantage of Ro-Tap sieve shaker?

Noise Level: It generates significant noise during operation, which can be disruptive in lab environments.

Limited Sample Size: It can only handle relatively small sample volumes, making it less suitable for large-scale analysis.

Mechanical Wear: The rotating and tapping mechanisms can experience wear over time, requiring regular maintenance or part replacement.

Not Suitable for All Materials: It may not effectively handle cohesive, sticky, or very fine powders that can clog sieves.

Time-Consuming: The process can be slow for certain materials, especially when high precision is needed.

Cost: The equipment and maintenance can be expensive compared to simpler sieving methods.

Technical specifications of Ro-Tap sieve shaker

Specification	RX-29 (8" Sieves)	RX-30(12" Sieves)	RX-29-E(Electronic, 8"Sieves)	RX-30-E (Electronic, 12" Sieves)
Sieve Diameter	8 in (200 mm)	12 in (300 mm)	8 in (200 mm)	12 in (300 mm)
Sieve Capacity (Full Height)	6 sieves + pan	4 sieves + pan	6 sieves + pan	4 sieves + pan
Sieve Capacity (Half Height)	13 sieves + pan	10 sieves + pan	13 sieves + pan	10 sieves + pan
Oscillations per Minute	278 ± 10	278 ± 10	Adjustable	Adjustable
Taps per Minute	150 ± 10	150 ± 10	Adjustable	Adjustable
Motor Power	1/4 HP	1/4 HP	1/4 HP	1/4 HP
Timer	Digital, 99 min x 0.1sec	Digital, 99 min x 0.1sec	Digital, adjustable	Digital, adjustable
Dimensions (W x Dx H)	28 x 21 x 25 in(71 x53 x 64 cm)	28 x 21 x 25 in(71 x53 x 64 cm)	18 x 18 x 30 in(46 x46 x 76 cm)	15 x 17 x 38 in (38 x43 x 96 cm)
Weight	180 lbs (82 kg)	180 lbs (82 kg)	80 lbs (36 kg)	117 lbs (53 kg)
Power Supply	110V/60Hz or 220V/50-60Hz	110V/60Hz or 220V/50-60Hz	110V/60Hz or 220V/50-60Hz	110V/60Hz or 220V/50-60Hz
Noise Level	~85 dB (78 dB with enclosure)	~85 dB (78 dB with enclosure)	Reduced with dampening	Reduced with dampening
Standards Compliance	ASTM C136,C702,D6913	ASTM C136,C702,D6913	ASTM C136,C702,D6913	ASTM C136, C702,D6913

Recommended mesh size of Ro-Tap sieve shaker

The mesh size of Ro-Tap sieve shaker should be determined according to the particle size range of the material being tested. The following are some mesh size recommendations for common materials (for reference):

Mesh size	aperture (μm)	Applicable scenarios
4~20 mesh	4,750~850μm	Coarse particles (such as sand, ore, feed particles)
25~60 mesh	710~250μm	Medium particles (such as cement, plastic particles, grain powder)
80~200 mesh	180~75μm	Fine powder (such as flour, medicinal powder, cosmetic raw materials)
230~400 mesh	63~38μm	Ultrafine powder (such as graphite powder, metal powder, lithium battery materials)
>400 mesh	<38μm，Need to match	Electroforming screen or airflow auxiliary device (such as nanomaterials, high-precision chemical powder)

Combination screen recommendation: It is recommended to configure a set of descending mesh screens (such as 100 mesh, 120 mesh, 150 mesh, 200 mesh, 250 mesh, chassis) according to the "full open screening method", so that a complete particle size distribution spectrum can be obtained.

Applications of Ro-Tap Sieve Shaker

Ro-Tap Sieve Shaker is widely evaluated in multiple industries for particle size analysis, classification and quality control. The following are the main application areas:

Construction and Civil Engineering: Used to analyze the particle size distribution of soil, aggregates (such as sand, aggregate) and cement. For example, the particle size of concrete mixes is tested to ensure strength and stability.

Mining and Geology: Classify ore, mineral and geological samples to determine the particle size distribution (such as from 5 inches to 20 microns). For example, analyze ore particles and refining and beneficiation processes.

Pharmaceutical: Analyze the particle size of pharmaceutical powders to ensure consistency and solubility, such as checking whether the powder meets the fineness requirements of 400 mesh to 635 mesh.

Research and Development: Used for particle size analysis experiments in the laboratory to support new material development and test the particle size characteristics of new alloys or composite materials.

Special Applications: Use wet sieving kits to analyze suspensions in liquid stocks, suitable for sticky or easily agglomerated samples. Or designed for coarse particles (such as 80 mesh and above), suitable for aggregate testing.

Ro-Tap sieve shaker price

Ro-Tap sieve shaker prices vary significantly depending on model, function, manufacturer and configuration. In general, you can expect the following price range (for reference only, please consult dahan suppliers for specific prices):

Basic Ro-Tap sieve shaker (8-inch sieve): roughly between RMB 15,000 and RMB 30,000, which usually has basic functions.

Models with more functions or larger sieve sizes (12-inch sieve): The price may be between RMB 30,000 and RMB 50,000 or even higher. These models may have more precise control, higher capacity or special designs.

Complete system including accessories such as soundproof box, automatic loading/unloading, etc. The price will increase further.

Determine the screen size you need, the number of stacking layers, whether special functions are required, etc. Clearly inform the supplier of your application field and specific needs so that they can provide the most suitable model and quotation.