Sieve mill ZAV

ZAV-10 Sieve Body by Zavod Moroza

The sieve body is the primary functional unit of stationary grain cleaning lines of the ZAV type. Its technological purpose is the physical separation of pre-aspirated grain mass into target fractions by calibration through a system of flat perforated sieves. Thanks to its multi-tier design and the possibility of rapid screen replacement, the process is precisely tuned to the parameters of a specific crop. During the reciprocating movement of the material across the working planes, stage-by-stage sorting occurs: macroscopic impurities and small screenings (sand, weed seeds) are isolated and diverted into waste channels; underdeveloped, shriveled, and broken seeds are separated into a dedicated forage fraction tray; while calibrated commercial grain exits the final tier and is directed via a gravity flow system into the target storage bin.

The operational cycle of a ZAV sieve body is accompanied by continuous dynamic loads - during operation, it constantly oscillates with a specified amplitude and frequency. Such operating conditions require sufficient structural rigidity. Any deviations in frame geometry or insufficient metal thickness under the influence of cyclic vibration lead to parasitic resonances, metal fatigue, and the rapid destruction of welded or bolted joints. Therefore, the structural reliability of the sieve body directly determines the stability and trouble-free operation of the entire grain cleaning complex, which is especially critical during peak seasonal loads.

Variability Features of the ZAV-10 Sieve Body

Given the long history of agricultural and elevator infrastructure operation, many variations of ZAV-type lines exist today. Our practical experience in manufacturing components and modernizing such complexes shows that the fleet of active equipment ranges from classic Soviet-era examples to deeply modernized units with unique features from contemporary manufacturers. Due to the lack of a single universal standard, the integration of a new ZAV sieve body often requires engineering compromises between the spatial constraints of the existing frame and calculated performance characteristics. In this process, the technical feasibility of various reconstruction stages is analyzed, and strict compatibility of the new unit with existing adjacent mechanisms - aspiration systems, bucket elevators, and gravity mainlines - is ensured. Considering these factors, the manufacturing process for a ZAV sieve body can follow a customer's technical assignment, or our engineering department can independently analyze the equipment, perform measurements and calculations, and design the optimal structure. At the same time, our extensive database of drawings for typical ZAV sieve bodies, built over years of production practice, allows us to significantly accelerate manufacturing times for the most common cleaning line modifications.

The configuration of the unit - including overall dimensions, the number of working tiers, and the total perforation area - is designed strictly for the technological needs of a specific facility. Depending on requirements, this could be a ZAV sieve body for basic primary cleaning of commercial grain or a more complex design for multi-stage seed material calibration. Despite the variability of form factors, the basic principle of fractional separation and the use of standardized perforated sheets remain unchanged. During development, special attention is also paid to optimizing the mass-to-strength ratio: the ZAV sieve body frame is made light enough to minimize inertial loads on the complex's supporting structures, yet it guarantees high spatial rigidity to counteract destructive cyclic vibrations. The engineering design also directly accounts for the type of kinematic drive used - the structure is adapted for a classic connecting rod-eccentric transmission or a modern system of independent vibration motors. To ensure ease of routine maintenance and rapid line reconfiguration for different crops, the design incorporates an ergonomic access system and mechanisms for the reliable, quick fixation of replacement sieves. As a result, the production capacities of the Zavod Moroza allow for the manufacturing of both exact copies of typical sieve bodies for quick component replacement on old complexes without changing mounting dimensions, and completely custom units based on individual drawings for integration into modernized grain cleaning lines.

Technological Standards of Production at the Zavod Moroza

The reliability of the ZAV sieve body under constant vibration loads is ensured by strict adherence to mechanical engineering standards. The manufacturing process is based on the following principles:

• Precision Metalworking
  Cutting and forming of the frame parts are carried out using laser cutting and CNC bending. This ensures ideal spatial geometry of the unit and absolute tightness of the guide fittings. Mathematically precise fitment eliminates gaps, preventing material from bypassing the sieves or the mixing of calibrated fractions.
• Welding Quality Control
  Assembly of the supporting frame accounts for continuous dynamic loads. Professional weld formation and the use of appropriate rolled metal minimize residual stress, protecting the structure from fatigue and micro-cracks caused by cyclic vibration.
• Reliability of Kinematic Components
  All connection points with the drive mechanism and suspension brackets are equipped with wear-resistant bushings or reinforced bearing units (depending on the drive type). Precise centering of the rod attachment points and verified suspension geometry ensure an even distribution of vibration impulses across the entire frame plane. This prevents parasitic misalignments, guarantees a stable oscillation amplitude, and eliminates the transfer of shock loads to the ZAV supporting structures.
• Anti-corrosion and Anti-abrasion Protection
  Metal surfaces are treated with specialized industrial coatings. This layer is resistant to constant friction, harsh grain dust, and seasonal moisture, significantly extending the unit's trouble-free service life, especially in open or semi-open areas.

As a result of this comprehensive approach, an efficient and balanced unit is formed. A ZAV sieve body from the Zavod Moroza is built for long-term operation, requiring no constant welding repairs, additional frame reinforcement, or frequent replacement of damaged suspension nodes, even under intensive 24/7 operation.

Versatility Across Different Crops

Although sieve bodies are designed for the specific dimensions and kinematics of a particular ZAV line, they are technologically universal calibration platforms. Adapting the equipment for various agricultural crops - from small seeds to large legumes or corn - does not require intervention in the mechanics or structure of the unit itself.

Reconfiguration for a different type of grain mass is carried out exclusively through the routine replacement of the working components - perforated sheets with the appropriate hole shape and size. The ergonomics of the guides and locking mechanisms incorporated during manufacturing allow staff to perform such changeovers as quickly as possible, minimizing technological downtime when switching between crops during the season.

Cooperation Algorithm and Ordering

The Zavod Moroza manages the full production cycle of sieve bodies for ZAV grain cleaning complexes - from initial engineering analysis to the delivery of the finished product. Given the specifics of each line, the process begins with data collection: the customer provides existing drawings, sketches, or actual dimensions of the worn unit. In the case of a deep reconstruction, a general technical assignment regarding the required capacity and cleaning type (primary or multi-stage seed) is formulated.

During the design and calculation stage, the engineering department analyzes the information. If matches are found in our drawing database, a proven typical solution is offered, significantly speeding up production. For non-standard modernized lines, a custom design is developed, followed by cost finalization and schedule coordination. The unit then undergoes the production cycle - precision metalworking, welding, and anti-corrosion protection according to the enterprise's approved standards.

The finished sieve body is shipped to the customer fully equipped or delivered to the site as a separate service using the plant's own vehicles or specialized logistics companies. Due to strict adherence to agreed mounting dimensions, the unit is ready for rapid installation on ZAV supporting structures. To start a project or receive technical consultation, simply contact the specialists at the Zavod Moroza, who will manage the manufacturing of your ZAV sieve body or any other grain cleaning line component to ensure the stable operation of your complex for many seasons to come.