Secondary Wear Block/Auxiliary Wear Pad
Our Services
1.Before sales, we will fully understand the customer's working conditions and recommend the most appropriate material selection to the customer.
2.Provide customers with drawings based on their machine models, spare parts dimensions, etc.
3.After sales, we will continue to pay attention to the usage of the product and provide timely help.
4.Ensure that the quality of the purchased components is impeccable, and the technical parameters absolutely meet national standards.
5.Provide free quotation, worldwide sales, short delivery cycle, low price.
The Secondary Wear Block (also known as the Auxiliary Wear Pad) is typically installed on the rotor of a Vertical Shaft Impact (VSI) crusher, positioned behind or to the side of the main tip (wear tip/impact block). Although it does not directly withstand the initial high-speed impact of the material like the main tip does, it acts as "body armor" for the rotor. Its primary function is to protect the rotor body (wear plates) from erosion caused by material rebound, friction, and material leakage.
Physical Location
It is usually mounted on the inner sidewalls of the rotor channels or on the back/sides of the main tips. In certain models (such as the Metso Barmac series or domestic improved versions), it may also be referred to as a "Side Wear Plate," "Back Wear Plate," or "Secondary Impact Block."
Three Core Functions
Protecting the Rotor Wear Plates: When material is thrown out by the main tips, some of it rebounds within the chamber or slides along the sidewalls. The secondary wear block blocks these "stray projectiles," preventing the rotor's steel body from being worn through. Once the rotor body is damaged, repair costs are extremely high (requiring cutting, welding, or complete replacement), whereas replacing a secondary wear block takes only a few minutes.
Guiding Material Flow: Optimized secondary wear blocks feature specific angles that reduce turbulence and friction resistance within the flow channel. This improves throwing efficiency and lowers energy consumption.
Forming a "Material Bed" Protection: In "rock-on-rock" crushing conditions, the design of the secondary wear block helps form a stable cushion of material inside the rotor. This enables "stone-on-stone" crushing, further reducing metal wear.
Material Selection
High Chrome Iron: The most common choice, featuring high hardness (HRC 58-62) and excellent wear resistance, though with slightly lower toughness. It is suitable for medium-hard materials.
Tungsten Carbide Insert: A high-end configuration. Tungsten carbide bars or granules are embedded on the working surface of the wear block. Its lifespan is 3 to 5 times that of standard high chrome iron, making it particularly suitable for highly abrasive materials like river pebbles and granite.
Ceramic-Metal Composites: Used in very few high-end applications. These utilize the ultra-high hardness of alumina ceramics, but at a significantly higher cost.
Structural Design
Split/Composite Design: Monolithic casting is rarely used nowadays. The standard is a "steel base + wear block" bolted assembly. The base is made of tough cast steel, while the wear block is made of high chrome iron. This "rigid yet flexible" combination effectively prevents breakage.
Diamond/Arc Shapes: Similar to main tips, secondary wear blocks often feature a diamond or arc shape. This is designed to eliminate gaps and prevent material from jamming into the crevices, which could otherwise shear the bolts or cause wear to the rotor body.
Reversible Use: Many secondary wear blocks are designed symmetrically. Once one side is worn, they can be removed, flipped over, and reused, increasing material utilization by 100%.
Key Principle: Replace in Sets, Never Individually!
Wear Limit: The secondary wear block must be replaced immediately when it wears down to the point of exposing the fixing bolt heads or the base steel plate. Once the bolt heads are exposed, the material will rapidly wash away the bolts, causing them to snap and fly out, which can destroy the rotor or even cause personal injury.
Weight Balance: This is the most easily overlooked aspect! VSI crusher rotors typically operate at 1000–1500 RPM. A weight difference of as little as 50g can cause severe vibration.
Operating Standards: When replacing, all secondary wear blocks must be replaced simultaneously (usually in sets of 3 or 4).
Weight Matching: Before installing new parts, they must be weighed to ensure the weight difference within the same set is within ±5g (refer to the specific manufacturer's manual).
Associated Inspection: When replacing secondary wear blocks, the main tips and channel liner plates must also be inspected. If the main tips are severely worn, the secondary wear blocks are likely nearing their limit as well. It is recommended to replace them as a complete set to avoid uneven stress distribution caused by mixing new and old parts.
Relevant parts
Auxiliary Throw Tip, Secondary Rotor Tip, Auxiliary Tip
- Categories : Sand Making Machine
- Customization Available : Yes
Service Process
The company's sales network covers all major cities across China, while our R&D and manufacturing products have reached numerous countries and regions in Southeast Asia, the Middle East, Africa, Europe, and beyond, earning widespread acclaim from customers worldwide.
FAQs
We have 30+ years of industry experience, a professional team of engineers, strong production strength and mature equipment.
The company has a complete accessory system to provide you with reliable and fast accessory services, complete models, high-quality and durable accessories.
Engineers personally go to the site for technical training in installation, operation and maintenance to help you solve installation and operation problems.
We provide lifelong service for the equipment we sell, including post-maintenance services.
We have professional technical experts and service teams to tailor solutions for each customer.
The mainframe is designed for continuous heavy-duty operation. Wear parts such as jaw plates, liners and blow bars are made of high-manganese steel or alloy materials, and their service life depends on the material hardness and working hours.
Every machine goes through material inspection, machining inspection, assembly and a full no-load test run before shipment. Inspection records and test videos are provided to customers.
Warmly welcome. You can visit our manufacturing base in person, and remote video inspection is also available for customers from overseas.
Yes. Package orders of a full line or multiple machines usually receive a more favorable price and priority in the production schedule.
Large mainframes are shipped by sea in containers or bulk vessels; smaller machines and spare parts go by container, air freight or international express, with full packaging for moisture and rust protection.