Technical Specifications and Quality Control for Conveyor Belt Splicing

Conveyor belt splices are the weakest link in a conveyor system; splice quality directly impacts overall performance and service life. Backed by over 20 years of technical expertise, Baoding Zhongbo Mining & Industrial Machinery Co., Ltd. has established a comprehensive set of splice process specifications and a robust quality control system. ## I. Hot Vulcanization Splicing Process ### 1. Process Principle Hot vulcanization splicing uses heat and pressure to trigger a vulcanization reaction in the rubber compound at the splice area, bonding it seamlessly with the main belt body to achieve strength close to that of the original belt. ### 2. Process Flow - **Splice Design:** Determine the number of steps and overlap length based on belt specifications. - **Head Stripping:** Strip canvas plies layer by layer, retaining the core ply. - **Cleaning & Grinding:** Remove surface impurities to increase bonding area. - **Gluing & Lamination:** Apply cement evenly and laminate layers sequentially. - **Vulcanization:** Maintain temperature at 145±5℃, pressure at 1.5-2.0 MPa; duration depends on thickness. - **Cooling & Trimming:** Allow natural cooling, then trim flash edges. ### 3. Key Control Points - **Temperature:** Deviation must not exceed ±5℃. - **Pressure:** Ensure uniform force distribution across the splice. - **Time:** Insufficient or excessive curing time compromises quality. - **Environment:** Prevent dust and moisture contamination of the splice surface. ## II. Cold Adhesive Splicing Process ### 1. Application Scope Suitable for locations where vulcanization equipment cannot be used, such as underground mines or high-altitude areas. ### 2. Process Highlights - **Surface Preparation:** Thoroughly clean and grind the splice surfaces. - **Gluing Technique:** Apply multiple thin coats; allow each layer to dry completely before applying the next. - **Lamination & Pressing:** Eliminate air bubbles to ensure full contact. - **Curing Time:** Cure for more than 24 hours at ambient temperature. ### 3. Precautions - **Temperature:** Implement heating measures if ambient temperature is below 10℃. - **Humidity:** Avoid construction if humidity exceeds 80%. - **Handling:** Prevent stress and vibration during the curing period. ## III. Splice Quality Inspection ### 1. Visual Inspection - **Flatness:** No significant unevenness. - **Edge Integrity:** No missing glue or overflow. - **Surface Quality:** Free from bubbles, cracks, or debris. ### 2. Strength Testing - **Tensile Test:** Splice strength must be no less than 85% of the original belt. - **Peel Test:** Inter-ply adhesion must meet standard requirements. ### 3. Non-Destructive Testing (NDT) - **X-Ray Inspection:** Check for internal voids or delamination. - **Ultrasonic Inspection:** Verify uniform bond quality. ## IV. Common Issues & Solutions ### 1. Splice Cracking **Cause:** Insufficient vulcanization temperature, low pressure, or short duration. **Solution:** Strictly adhere to process parameters and enhance process monitoring. ### 2. Splice Deformation **Cause:** Uneven heating or unbalanced pressure. **Solution:** Optimize the vulcanizing plate structure and calibrate equipment regularly. ### 3. Poor Adhesion **Cause:** Incomplete surface preparation or inferior cement quality. **Solution:** Standardize operating procedures and select high-quality cement. Baoding Zhongbo provides professional splice technical services and training to ensure customers master correct splicing techniques, extending conveyor belt service life.