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Last month, a DAINAMU SZ-450D tracked mobile heavy screening machine was officially delivered and put into production in Fujian.
The customer's working conditions are typical—mountainous mining, with raw materials containing a lot of mud and stones, and during the rainy season, the moisture content is also quite high. If ordinary screening equipment were used, the screens would clog in no time, forcing the subsequent crusher to stop operating.
With the arrival of this SZ-450D, the problem was easily solved. Today, let's talk about this equipment and why more and more sand and gravel aggregate customers are beginning to value the "primary screening" stage.
What is a heavy screening machine? Why is it indispensable in a crushing line?
A heavy screening machine, also called a pre-screening machine (Scalper Screener), is the "pioneer" in the entire crushing production line.
Its work is simple: before the material enters the crusher, it filters out mud, fine materials, and moisture, only sending qualified coarse materials into the crusher.
It sounds simple, but its role is extremely important.
Mud and stone separation—this is the core function of a heavy screening machine. Many mine raw materials contain a large amount of mud and weathered layers. If these are fed directly into a jaw crusher, it's like using the cost of a crusher to crush mud, wasting capacity, increasing wear and tear, and affecting the quality of the final aggregate.
Primary screening—pre-screening removes fine materials that have already reached finished product specifications, eliminating the need for subsequent crushing processes. A single heavy screening unit can divert 30%-50% of the material, directly halving the pressure on subsequent crushers.
High-moisture materials still pass—ordinary screening equipment quickly gets clogged with mud when encountering materials with high moisture content, causing a sharp drop in capacity. Heavy screening units have large screen spacing and a robust structure, allowing for normal screening even with wet raw materials.
In short: Heavy screening clears obstacles for subsequent crushing equipment. Without it, the crusher is doing the work of a screening machine; with it, the entire production line can operate efficiently.
What can the SZ-450D do? Let's look at the on-site data.
This SZ-450D operating in Fujian has a stable actual capacity of 300 tons per hour.
Customer's raw material situation: Mined in mountainous areas, a mixture of soil and rock. High moisture content during the rainy season, resulting in wet and sticky materials. Maximum feed particle size is within 500mm. After screening: Fine materials (0-30mm) are directly diverted and do not enter the crusher. Coarse materials (over 30mm) are fed to the jaw crusher for further crushing. Soil and moisture are largely separated during the primary screening stage. The customer made a very practical comment: "The crusher used to clog every day, but now it only does the crushing work, making things much easier."
DAINAMU SZ-450D: Fully Hydraulic System, Worry-Free and Labor-Saving. Heavy screening equipment may not seem complex, but details determine the experience. There are several aspects of the configuration used by DAINAMU on this SZ-450D that I think are worth mentioning.
Fully Hydraulic System—From track walking, feed hopper folding, screen vibration to conveyor belt folding, everything is hydraulically driven. No external power supply is needed; the equipment can be set up and started working as soon as it arrives on site. Relocation is also convenient; you can drive it away yourself without waiting for a crane.
YE3 High-Efficiency Motor – All DAINUM equipment comes standard with a YE3 motor, and this SZ-450D is no exception. Compared to the older YE2 model, the YE3 is 3%-6% more energy efficient, saving nearly 10,000 RMB in electricity costs per machine per year. More importantly, the YE3 motor has stronger overload capacity, making it less prone to tripping and shutdown when material loads suddenly increase. We previously wrote a comparative article specifically highlighting the advantages of the YE3 motor; you can check it out if you're interested.
Excellent Brand Components – DAINAMU doesn't use off-brand components for hydraulic pumps, hydraulic valves, bearings, and seals. The hydraulic system uses top-tier domestic brands, the bearings are SKF/FAG grade, and the seals are imported. While these components may seem more expensive individually, the equipment runs for over a decade, and the saved maintenance time and spare parts costs far outweigh the initial price difference.
Quick Screen Replacement – Heavy-duty screens are wear parts, and DAINAMU has designed a quick-release structure for on-site replacement without disassembling the entire machine. Screen aperture sizes can be customized to customer needs, including 0-5mm, 5-10mm, and 10-30mm.
Self-propelled tracked system – no trailer needed for site relocation; the equipment drives itself. This feature saves a lot of trouble for customers who frequently need to change sites.
Customer's real experience: "The crusher used to clog every day." This customer from Fujian learned this the hard way.
Initially, without a heavy-duty screen, the raw material went directly into the jaw crusher. Mud and stones were crushed together, the crusher's capacity was low, the liners wore out quickly, and the screening equipment was frequently clogged with mud. During the rainy season, it was even worse; the material was wet and sticky, and the entire production line almost came to a standstill.
After installing the SZ-450D: Soil and fine materials are separated during the initial screening stage; the crusher only processes coarse materials.
High screening efficiency, a stable 300 tons per hour. High-moisture materials do not clog the screen holes, allowing for normal production even during the rainy season. Fully hydraulic design, easy to relocate, and can be operated by one person.
Customer's words: "After this equipment arrived, the problems on the entire production line were reduced by more than half. The crusher no longer clogs, the screening machine no longer jams, output has increased, and maintenance has decreased."
Who needs a heavy-duty screen?
If you encounter any of the following situations, we strongly recommend considering installing a heavy-duty screen: High mud content in raw materials, requiring mud-stone separation; High moisture content in materials, making ordinary screening equipment prone to clogging; Want to improve the overall capacity and efficiency of the crushing line; Need frequent relocation, fixed screening stations are inconvenient; Have a large amount of fine material requiring primary screening and pre-separation, and don't want to waste crushing capacity.
The DAINAMU SZ-450D tracked mobile heavy-duty screen has a processing capacity of 200-400 tons per hour, is fully hydraulically driven, uses a YE3 high-efficiency motor, and comes standard with international brand parts. Customized screen aperture sizes are supported, and OEM is also available.
Want to know if the SZ-450D is suitable for your working conditions? Feel free to contact us for free selection solutions, capacity calculations, and detailed quotations.
Phone / WhatsApp / WeChat: +86 15385175652
Email: suhmanhf@gmail.com
Website: www.dainamu.com
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