Electromagnetic Vibratory Feeding and Kiln Charging Solutions for the Glass Industry

Summary

In glass production, the batching of raw materials and the feeding into the furnace directly determine the compositional stability and melting efficiency of the molten glass. Raw materials such as silica sand, soda ash, limestone, and cullet are highly abrasive and generate substantial dust; conventional feeding equipment typically suffers from three major drawbacks: rapid wear of the trough, poor batching accuracy, and excessive dust emissions. The ATEPU RUI FZH/FZL series electromagnetic vibratory feeders have been specially optimized for the glass industry: their hoppers are constructed from highly wear‑resistant materials and can be fitted with liners, achieving a small‑batch batching accuracy of ±0.3%; for furnace feeding, a dedicated FZH‑type feeder is employed, featuring a refractory‑lined trough, a pusher mechanism, and an automated control system, with the entire unit capable of moving along rails—balancing high‑temperature durability with ease of furnace maintenance.

Industry Background

The glass industry may appear traditional, but its requirements for ingredient‑mixing accuracy are far from modest. The light transmittance of float glass, the transmittance and impact resistance of photovoltaic glass, and the color consistency of everyday glass—all ultimately depend on the stability of the raw‑material formulation. Moreover, once a glass production line is fired up, it typically runs continuously for 5 to 10 years without shutdown; if the feeding equipment cannot withstand wear and fails mid‑process, the cost is a loss of capacity across the entire line.

The ATBR electromagnetic vibrating feeder is primarily deployed in three stages within the glass industry: batching of bulk raw materials, batching of trace additives (minor ingredients), and charging into the furnace. These are described below one by one.

Process Stages and Solutions

1. Bulk raw material formulation—wear resistance comes first.

The main components of glass batch are silica sand (quartz sand), soda ash, limestone, dolomite, feldspar, and others. Silica sand has a Mohs hardness of approximately 7, and when combined with the sharp edges and corners of cullet (recycled glass), it causes severe erosive wear on the troughs of feeding equipment.

Under these operating conditions, ordinary carbon steel troughs typically wear through in as little as six months and need to be replaced within about a year. At Pu Rui, the approach is:

• The trough body substrate has been replaced with high-wear-resistant alloy steel. , or install replaceable wear-resistant liners on the inner wall of the standard hopper (options include high-chromium cast iron, ceramic liners, etc.)
• The liner is secured with bolts or features a quick‑release slot‑and‑bolt design; when worn, only the liner needs to be replaced—no need to swap out the entire trough—cutting maintenance costs by more than half.

In practical tests, the chute equipped with wear‑resistant liners saw its service life extended from less than one year to over three years under continuous feeding conditions involving silica sand and crushed glass, while overall maintenance costs were reduced by approximately 40%.

2. Small-quantity ingredient batching—how is ±0.3% accuracy achieved?

In addition to the major raw materials, glass formulations also include small quantities of additives: fining agents (such as sodium nitrate), colorants (such as iron oxide, cobalt oxide, and selenium oxide), and fluxes. These minor ingredients are used in very low proportions—typically a few to several dozen kilograms per batch—but demand extremely high precision: an excess can adversely affect color and bubble formation, while an insufficient amount will compromise the fining effect.

The traditional method involves manually weighing ingredients and then transferring them to a mixer, which is not only inefficient but also prone to human error.

Solution for the ATE PuRui FZH Series Electromagnetic Vibratory Feeders:

• Each type of ingredient is fed by a dedicated feeder, with the hopper–feeder–weighing hopper assembly constituting an independent batching unit.
• The feed rate is continuously controlled by adjusting the coil current, coupled with closed-loop feedback from a load cell.
• Dual-speed feeding mode: Run at high speed for 90%–95% of the target amount, then switch to low speed for precise final topping-off of the remaining 5%–10%.
• The measured batching accuracy remains stable within ±0.3%.

This solution automates the manual weighing process, significantly increasing batching speed while delivering batch-to-batch consistency that far surpasses manual methods.

3. Kiln Charging — FZH-Type Kiln Feeder

After the batch materials are thoroughly mixed, they are fed into the glass melting furnace by a feeder. This stage imposes the highest requirements for temperature control, dust management, and process continuity, and the uniformity of material feeding directly affects the stability of the molten glass surface and the quality of the melt within the furnace.

At Pu Rui has developed a dedicated FZH-type kiln feeder specifically for kiln charging, which is entirely different from the general-purpose feeders used for batching. It is custom-designed to meet the operating conditions at the kiln head.

Refractory material tank body. The discharge end of the feeder extends into the kiln’s charging port, directly exposed to the high‑temperature radiation inside. The hopper body is lined with refractory material, offering heat resistance far superior to that of standard stainless steel hoppers, thereby ensuring it remains deformation‑free and crack‑free even under prolonged exposure to the intense heat at the kiln head.

Material-feeding mechanism. The trough is equipped with a mechanical pushing device; once the material enters the trough, the pushing mechanism evenly conveys it into the kiln at a preset cycle. Both the pushing speed and stroke are adjustable, and when combined with the precise metering of an electromagnetic vibrating feeder, this ensures consistent batch quantities and uniform spreading within the kiln, preventing localized material buildup that could disrupt the kiln’s thermal balance.

Automatic control system. The feeder is equipped with an independent control cabinet and supports PLC‑based programming. Users can configure parameters such as the feeding frequency, the amount fed per cycle, and the feed rate, and it can be integrated with the kiln’s DCS system. Once feedback signals—such as the kiln’s liquid level and temperature—are received, the feeder automatically adjusts the feeding rhythm, enabling closed-loop operation that delivers precisely the amount of material the kiln requires.

Rail-mounted design. The feeder is mounted on a rail and, during normal operation, feeds material from the kiln head. When the kiln requires maintenance or refractory brick replacement, the feeder retracts along the rail as a whole, creating sufficient working space. Once the work is completed, it is pushed back into its original position, resuming production without the need for repeated disassembly and reassembly of the equipment.

Technical Features

Wear-resistant design extends the replacement cycle. The hopper base material can be either high‑wear‑resistant alloy steel or standard steel with replaceable liners. When the liners wear out, they can be replaced individually without having to replace the entire hopper. Under operating conditions involving silica sand and crushed glass, service life is extended from less than one year to over three years, while overall maintenance costs are reduced by approximately 40%.

Precise portioning of ingredients. Electromagnetic actuation delivers rapid response (<50 ms) with crisp on/off switching and no trailing. When paired with a load cell, it enables dual‑speed closed‑loop batching control, maintaining ingredient‑weighing accuracy within ±0.3%. Batch-to-batch repeatability is excellent, eliminating the need for manual verification after each batch.

Kiln charging—custom-designed without compromise. The FZH-type kiln feeder is not a simple modification of a standard feeder; it is a purpose-built device with a completely redesigned architecture, encompassing the refractory lining of the trough, the pushing mechanism, the rail‑mounted chassis, and the control system. The pushing cycle and feeding rate can be independently programmed via PLC, and when integrated with the kiln’s DCS, it enables on‑demand material charging. The rail‑guided movement design allows the entire unit to be retracted during kiln maintenance, eliminating the need for disassembly.

Dust control is effectively implemented. In the batching process, the FZL fully enclosed feeder, coupled with dust‑collection piping, reduces dust emissions at discharge points by more than 90% compared to open‑top feeders. This not only meets the environmental protection authorities’ requirements for dust emissions in glass batching facilities but also enhances the working environment for operators.

It can withstand continuous production. Once a glass furnace is ignited, it runs continuously, requiring the associated feeding equipment to operate nonstop as well. Both the electromagnetic vibrating feeder and the furnace charging machine have no rotating parts, bearings, or lubrication points; routine maintenance consists of inspecting liner wear and clearing accumulated material. The electromagnets are designed for a service life exceeding 10 years and can operate continuously, 24 hours a day, 365 days a year, without issue.

Actual operational data

The following are the operational data for a 600‑ton‑per‑day float glass production line’s batching and furnace charging systems (using Atopu Rui FZH/FZL series feeders and furnace chargers):

Conclusion

The raw-material processing stage in the glass industry is shifting from a coarse, unrefined approach to one of greater precision—ingredient‑mixing accuracy directly impacts product quality, dust‑control compliance ensures environmental standards, and equipment wear resistance determines maintenance costs and the risk of downtime. The use of electromagnetic vibratory feeders in glass batching and kiln charging essentially replaces traditional, bulky, high‑maintenance systems with a compact, precisely controlled solution.

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