Bucket elevators (NC-10 - NC-100)

Bucket Elevators from Zavod Moroza

The bucket elevator of the NC series (centrifugal elevator) is continuous transport equipment designed for the vertical lifting of bulk materials. The main nomenclature of transported materials includes food and feed grain, seed material, components and finished pellets of compound feeds, as well as fuel pellets.

Structurally, the bucket elevator of our production is manufactured in a reinforced industrial design. The unit is designed for long-term operational loads and is intended for stationary integration into the technological lines of grain cleaning complexes (ZAV), grain drying systems (KZS), seed plants, and transshipment elevators. The operating principle is based on centrifugal discharge, where the ejection of the transported material into the discharge branch pipe is carried out due to centrifugal force while the traction organ bypasses the drive pulley in the upper head of the unit.

Relying on the accumulated operational experience and the results of loads in real production conditions, the engineering and design department of Zavod Moroza continuously optimizes the basic architecture of the equipment. Thanks to this, today bucket elevators are produced in various designs, which allows for the pinpoint integration of modern technical solutions - from the selection of specialized materials for the traction organ to updated kinematic drive schemes - all for the specific tasks of the customer. Such a modular approach guarantees the exact adaptation of the unit to the specifics of any facility, maintaining stable indicators of reliability and energy efficiency of the system as a whole.

Model Range of Bucket Elevators of Zavod Moroza

The capacity of our bucket elevators directly depends on the transportation speed, the width of the elevator belt, and the working volume of the bucket. Depending on the required throughput of the technological line, the bucket elevator of the NC series is produced in three basic modifications:

• NC-20 with a calculated capacity of 20 t/h, where the traction organ is equipped with a conveyor belt 175 mm wide and working buckets 160 mm wide.
• NC-50 with a calculated capacity of 50 t/h, where the equipment is based on the use of a belt 300 mm wide with the installation of buckets 260 mm wide.
• NC-100 with a calculated capacity of 100 t/h – this bucket elevator is a modification of the previous elevator with increased capacity, uses a 300 mm belt and 260 mm elevator buckets, where to double the throughput without expanding the cross-sectional dimensions of the shaft itself, buckets of increased depth (volume) and a corresponding change in their fastening pitch are used.

The unification of the sizes of the elevator pipes (trunks) for the NC-50 and NC-100 models is a purposeful design decision, because such standardization of load-bearing elements allows enterprises to easily scale production in the future. If it is necessary to increase the line capacity from 50 to 100 tons per hour, the customer does not need to dismantle the entire metal structure of the column - it is enough to modernize the traction organ (install more spacious buckets) and recalculate the power of the drive station, which ultimately also ensures high maintainability of the system and significantly reduces capital costs for the reconstruction of the facility.

In addition to the basic line, the production capacities of Zavod Moroza allow designing and manufacturing bucket elevators of other required capacities, in particular, compact models NC-5 and NC-10 (for local packaging lines and small seed complexes), as well as high-performance units NC-75 and NC-175 (for port terminals, route elevators, and high-performance grain cleaning complexes). For each such unit of the bucket elevator, an individual kinematic calculation is performed. Based on the technical specifications (lifting height, type of cargo, and operating mode), a proportional selection of all working units is carried out - the designers calculate the required traction effort of the belt, the nominal torque of the gear motor, the optimal diameters of the drive shafts, and the standard sizes of the bearing supports. This approach guarantees that regardless of the ordered throughput, the bucket elevator will have the appropriate margin of kinematic strength and ensure uninterrupted operation in the specified technological cycle.

Working Organs of Bucket Elevators of Zavod Moroza

In the basic industrial design, the bucket elevator is equipped with metal welded buckets - they are made of durable sheet steel, resistant to the constant abrasive impact of bulk materials, and provide the necessary spatial rigidity during intensive scooping of cargo from the boot. The metal working organ is the standard for working with heavy crops and in conditions of high dustiness or weediness of the product.

Depending on the specifics of the technological process, the material, and the requirements for the discharge speed, the configuration of the traction organ is calculated individually. For seed lines and working with fragile crops (soybeans, corn, peas), we propose using polymer buckets - they have high elasticity, which minimizes damage to the kernel upon contact, and also significantly reduce the overall weight of the elevator belt, reducing the static load on the drive shaft. In cases where it is necessary to maximize capacity with limited shaft dimensions, the bucket elevator can be equipped with a system of bottomless buckets, where blocks are structurally formed in the form of a row of buckets without a bottom (which actually perform the role of walls) and are installed with a minimum pitch close to each other, and one standard bucket with a bottom closes such a section from below. This turns the material into a continuous vertical flow, which also minimizes aerodynamic resistance inside the pipe and allows increasing the unit's throughput without increasing the belt speed.

Proper selection of the type, geometry, and fastening pitch of the buckets is an important stage in the overall kinematic calculation of the equipment, which is necessarily taken into account when designing bucket elevators, where also, to ensure the versatility of the unit when working with a wide nomenclature of cargoes, the bulk density of various materials, their flowability, moisture, and angle of repose are calculated in detail. Such a precise engineering approach guarantees an ideal balance between the bucket fill factor at the lowest point and its complete emptying under the action of centrifugal force in the discharge head, which prevents the backflow (back-spill) of material into the shaft, makes an imbalance of the traction organ impossible, and optimizes the energy consumption of the drive station in all operating modes.

Housing Materials of Bucket Elevators of Our Production

The load-bearing structure of the unit, along which the traction organ moves (shafts or pipes of the bucket elevator), is made of high-quality sheet metal with a thickness of 1.5 to 3 mm. The choice of the type of rolled metal and its thickness is regulated by the technical specifications, operating conditions, and overall lifting height.

For the manufacture of standard intermediate sections up to 2 mm thick, cold-rolled steel is used - it is distinguished by high accuracy of linear dimensions, which allows forming perfectly even flange connections and prevents the formation of internal "steps" that damage the grain. For pipes with a wall thickness of 3 mm, as well as for the most loaded units (the loading boot and the discharge head), hot-rolled steel is used. Such a selection of materials provides the structure with high spatial rigidity, and thanks to this, the bucket elevator can be designed in a fully self-supporting design, which allows erecting the column without the need to install complex additional supporting metal structures.

The shaft design is developed taking into account strict requirements for maintainability in conditions of continuous production, where quick-detachable inspection covers are provided on the sections for ongoing control of the traction organ. The kinematics and location of the fasteners allow for the local replacement of worn box walls without dismantling the entire section and without the need to unlace (disconnect) the elevator belt. In addition to standard solutions, at the stage of designing the housing or the bucket elevator as a whole, any additional customer requirements can be implemented, including local lining of intensive friction zones, arrangement of branch pipes for the aspiration system, installation of explosion relief panels, as well as preparation of mounting places for belt misalignment and product backup sensors.

Drive and Tension Stations (Head and Boot of the Bucket Elevator)

The upper unit of the assembly is the discharge head, which simultaneously performs the function of the drive station - here the main working element is the drive pulley. To ensure a stable traction effort and eliminate belt slipping at peak loads, the working surface of the pulley can be subjected to lining (additionally covered with friction technical rubber). Also, the pulley shaft can be fixed in remote (outboard) bearing units, and such a modification allows physically moving the friction zone outside the working chamber of the trunks, which will reliably protect the bearings from the ingress of fine grain dust and completely eliminate the heating of the internal space of the elevator in case of their critical wear.

The transmission of torque to the shaft is carried out through the drive system, which is selected according to the required power. Depending on the configuration, the bucket elevator is equipped with a classic counter-drive or an industrial gear motor. The direct connection of the gearbox shaft to the drive shaft of the pulley is realized through an elastic pin-bushing coupling (MUVP), and the use of a coupling of this type allows compensating for minor angular misalignments of the axes, and also effectively dampens vibration and shock loads during start-up or emergency stopping of the equipment.

The lower unit of the assembly is the loading boot, which serves as a receiving hopper and performs the function of a tension station. Inside it, a driven pulley is located, where, when designing equipment for grain lines, a slatted design is obligatorily used - this engineering solution allows the bulk mass to pass freely through the pulley, eliminating the crushing of the material that could get between the inner side of the belt and the metal.

The adjustment of the working tension of the belt and its centering in the column is carried out using two symmetrical screw mechanisms located on the outer sides of the boot. The bearing supports of the tension pulley are made in an outboard format for the convenience of lubrication and control, and for the quick discharge of material residues when switching to another crop or for performing technical maintenance, the lower part of the boot is equipped with inspection slide gates (hatches).

About the Industrial Experience of Zavod Moroza and Equipment Adaptation

The production of conveying equipment at Zavod Moroza is based on the principles of continuous technical improvement, where the design of the units is not a static copy of outdated standard drawings - it constantly evolves. Every change in the kinematics or architecture of the bucket elevator is implemented based on a deep analysis of many years of operation and real feedback from practicing mechanics and chief engineers of elevator complexes. This approach allows us to create equipment that is perfectly adapted to harsh domestic realities - it has an embedded industrial margin of safety for stable operation at peak loads at the height of the harvest, and also withstands intensive wear when transporting wet or highly weeded material.

The key advantage of our engineering approach is a high degree of modularity and flexibility of configurations. Every bucket elevator manufactured at Zavod Moroza is considered as an individual project. From the selection of the rolled metal thickness and the type of traction organ to specific modifications, such as the lining of units or the integration of additional automation - everything is calculated in detail by our designers for the specific parameters of your technological line. Any technological task is solved exclusively by means of an exact engineering calculation, bypassing compromise universal schemes - each element of the elevator is selected individually to achieve an ideal balance between kinematic reliability, energy efficiency, and careful transportation of the product.

Owning a full-cycle production, Zavod Moroza exercises strict quality control at every technological stage - from cutting sheet metal to the final dynamic balancing of the drive pulleys. By choosing our equipment, the customer receives a reliable, geometrically verified, and maintainable tool for the vertical transshipment of bulk materials. This investment in high-quality logistics guarantees the minimization of technical downtime, the preservation of product integrity, and the uninterrupted operation of the entire technological line for many seasons.

To discuss technical details, calculate capacity, or consult on integrating the bucket elevator into your facility - contact the specialists of Zavod Moroza. We are always open to an objective constructive dialogue and are ready to share our operational experience.