Concrete Mixer Door Liner
Especificações Técnicas
Key Attributes
| Product Name | Concrete Mixer Door Liner / Discharge Gate Wear Plate |
| Material Grade | Cr20 / Cr26 High-Chromium Cast Iron, Ni-Hard 4 |
| Hardness Rating | 62 – 66 HRC (Vickers Micro-Hardness 1500–1800 HV) |
| Machine Compatibility | BHS, SICOMA, Liebherr, Teka, SIMI, ELKON, MEKA, Linz |
| Mixer Types | Twin-Shaft, Single-Shaft, Planetary, Pan Mixers |
| Clearance Tolerance | 0.5mm – 1.5mm Precision Radius Machined |
| Primary Function | Discharge Gate Sealing & Fluid Shear Erosion Defense |
| Casting Process | Vacuum Sand Casting & Automated Isothermal Heat Treatment |
| Brand Name | VOTNE |
| Place of Origin | China |
| Liner Thickness | 15mm, 18mm, 20mm, 25mm (Customized) |
| SEO Keywords | concrete mixer door liner, discharge gate liner, BHS door liner, SICOMA discharge liner, mixer gate plate, concrete wear parts |
Product Overview
VOTNE Concrete Mixer Door Liners are precision-machined wear-resistant plates engineered specifically to line the hydraulic or pneumatic discharge gate assembly of twin-shaft, planetary, and pan concrete batching mixers.
Located at the bottom of the mixing trough, discharge door liners undergo extreme fluid shear erosion every time the gate opens under full batch weight (up to 4.5 cubic meters of dense concrete). Furthermore, door liners must maintain an exact mechanical clearance (0.5mm to 1.5mm) against fixed central drum liners. If low-grade iron door liners warp or wear unevenly, fine cement grout bleeds through the gate seal, leaving behind unmixed aggregate pockets and causing concrete segregation in transit mixers. VOTNE door liners utilize advanced Cr20 and Cr26 high-chromium alloy casting technology, forming a dense micro-structure of discontinuous M7C3 eutectic carbides (1500 to 1800 HV) bound inside a stress-relieved tempered martensitic matrix.
Engineered with CNC-machined radius curvatures and flush countersunk bolt recesses, VOTNE concrete mixer door liners deliver up to 3 times longer wear life than standard cast plates, ensuring zero grout leakage and lowering your total cost per cubic meter.
Material & Alloy Grade Selection
| Alloy Grade | Chemical Composition | Hardness | Microstructure | Best Application |
|---|---|---|---|---|
| VOTNE Cr26 Super High-Cr | C: 2.8-3.6%, Cr: 24-28%, Mo/V | 63-66 HRC | M7C3 Carbides in Martensite | High-Speed Discharge of Granite & Quartzite Concrete |
| VOTNE Cr20 Standard High-Cr | C: 2.6-3.4%, Cr: 18-22%, Mo | 62-65 HRC | Discontinuous M7C3 Carbides | Commercial Ready-Mix & General Concrete Plants |
| Ni-Hard 4 White Iron | C: 3.0%, Ni: 5.5%, Cr: 9.0% | 58-62 HRC | Fe3C / M3C Carbide Network | Fine Mortar & Light-Duty Batching Mixers |
Technical Specifications & Dimensions
| Mixer Brand / Model | Liner Position | Standard Thickness | Radius Curvature Fit | Approx. Weight (kg) |
|---|---|---|---|---|
| BHS DKXS 2.0 / 3.0 | Discharge Door Assembly | 20mm / 25mm | CNC Radius Machined | 14.5 kg |
| SICOMA MAO 2250 / 3000 | Discharge Gate Tile | 15mm / 20mm | OEM Fit Clearance | 11.8 kg |
| Liebherr DW 2.25 / 3.0 | Bottom Gate Segment | 20mm / 25mm | Heavy Seal Profile | 16.4 kg |
| TEKA TPZ 1500 / 2250 | Planetary Discharge Door | 15mm / 20mm | Center Gate Machined | 10.2 kg |
| Custom OEM Drawings | Tailored to Spec | 15mm - 25mm | As Per CAD Drawing | Custom |
Key Advantages for Plant Operators
Zero Cement Grout Bleeding
CNC-machined radius sealing edges maintain exact 0.5mm to 1.5mm clearances, preventing cement paste leakage and concrete segregation.
High Fluid Shear Resistance
High-density M7C3 carbides withstand continuous high-velocity slurry flow during rapid door opening/closing cycles under full batch weight.
Flush Countersunk Bolt Fit
CNC-machined countersunk bolt holes ensure bolt heads seat completely flush, preventing gate seal jams and slurry build-up.
Extended Door Seal Lifespan
Flat, wear-resistant door liner surfaces prevent mechanical damage to pneumatic and hydraulic door sealing strips.
Standard & Custom OEM Stock
Direct replacement discharge door liners in stock for major European and Asian mixer brands, with rapid custom casting available.
Applications & Field Use Cases
VOTNE Concrete Mixer Door Liners are widely specified across high-volume concrete discharge operations:
- Commercial Ready-Mix Concrete Batching Plants (Twin-Shaft Mixers 1.0m³ to 4.5m³)
- Precast Concrete Production Facilities (Planetary and Pan Mixers for pipe, beam, and precast slab casting)
- High-Speed Infrastructure & Dam Construction Projects
- Asphalt & Cold-Recycled Pavement Mixing Plants
- Mining Paste Fill & Underground Backfill Preparation
- Industrial Refractory & Mortar Production Systems
Frequently Asked Questions (FAQ)
1. How do VOTNE door liners prevent cement paste bleeding during batch mixing?
VOTNE door liners undergo CNC radius precision machining to ensure a uniform 0.5mm to 1.5mm clearance against central trough liners and rubber door seals. This precise mechanical fit prevents cement grout from leaking through the discharge gate when closed.
2. Which alloy grade is recommended for discharge door liners: Cr20 or Cr26?
For standard commercial ready-mix concrete, VOTNE Cr20 (62–65 HRC) provides long service life. If your plant mixes abrasive aggregates like crushed granite, quartzite, or iron slag under high discharge velocities, we recommend VOTNE Cr26 (63–66 HRC) for maximum resistance to fluid shear erosion.
3. What installation steps ensure proper alignment of discharge door liners?
Before mounting new door liners, thoroughly clean the discharge gate steel frame. Align the door liner radius against the fixed trough liners to ensure an even 1.0mm gap along the entire arc. Apply high-tack RTV sealant behind the plate and torque M16 Grade 10.9 countersunk bolts to 210–230 N·m.
4. Can VOTNE manufacture custom discharge door liners for specialized mixers?
Yes. VOTNE produces custom door liner plates based on customer sample castings or 2D/3D CAD drawings. We can customize gate radius curvature, thickness, bolt hole centers, and alloy formulations to match any mixer design.
5. What are your lead times and trade terms for export orders?
Standard replacement door liners for BHS, SICOMA, and Liebherr mixers are kept in stock for immediate shipment. Custom casting orders take 15 to 25 days. We support EXW, FOB, CIF, and DDP trade terms with worldwide delivery.