Precautions for Installation of Screw Conveyors
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When installing a screw conveyor, pay close attention to the following core aspects to ensure stable operation and long service life:
Precautions for Installation of Screw Conveyors
As core equipment for bulk material conveying, the installation quality of screw conveyors directly determines their operational stability and service life. The installation process must strictly comply with technical specifications, with key focus on the following points:
1. Pre-Installation Foundation Preparation
1.1 Site and Equipment Inspection
Clear debris from the installation site to ensure the working space meets equipment assembly requirements. Meanwhile, check whether the strength of the foundation concrete meets the design requirements (usually ≥ C30), and control the flatness error of the foundation surface within 5mm per meter. During unpacking and acceptance of the equipment, verify that the models of components such as screw blades, casings, and motors are consistent with the drawings. Inspect for deformation of screw blades, cracks in casings, and ensure anti-rust protection for key connectors (e.g., bearings, couplings).
1.2 Tool and Personnel Preparation
Prepare professional tools such as torque wrenches, levels (accuracy 0.02mm/m), and laser alignment instruments, ensuring that measuring tools are within their verification validity period. Installation personnel must be familiar with equipment drawings, clarify the assembly sequence of each component, and special operation personnel (e.g., crane operators) must hold valid certificates to work.
2. Installation of Core Components of the Main Machine
2.1 Precision Control for Casing Assembly
When assembling segmented casings, use bolt connections and fasten them evenly. The fitting gap between flanges of adjacent casings must be ≤ 0.1mm, and the straightness error of the casing axis should not exceed 1mm per meter, with a total cumulative error of no more than 5mm for the entire length. For inclined installation of the conveyor (usually with an inclination angle ≤ 20°), add anti-slip supports at the bottom of the casing to prevent displacement during operation.
2.2 Key Requirements for Screw Shaft Installation
Before installing the screw shaft, check the coaxiality between the bearing housing and the casing. Adjust the shim to ensure the deviation between the center of the bearing housing and the casing axis is ≤ 0.05mm. When connecting the screw shaft to the motor coupling, the radial displacement error should be ≤ 0.03mm and the end face runout error ≤ 0.02mm, to avoid bearing overheating or shaft system damage caused by misalignment. Additionally, the gap between the screw blades and the inner wall of the casing must be uniform, with a unilateral gap typically ranging from 5mm to 10mm, preventing material jamming or excessive wear.
3. Installation Specifications for Auxiliary Systems
3.1 Sealing and Lubrication Systems
Install oil-resistant rubber gaskets at the joints between the inlet/outlet and the casing. Tighten the fastening bolts in a diagonal and step-by-step manner to ensure tight sealing and prevent dust leakage. For bearing lubrication, select grease that meets the requirements of the instruction manual (e.g., lithium-based grease), with the filling amount accounting for 1/3 to 1/2 of the internal space of the bearing, avoiding insufficient lubrication or excessive heating.
3.2 Electrical System Wiring
Motor wiring must comply with the electrical schematic diagram to ensure correct phase sequence, with a grounding resistance ≤ 4Ω. When installing overload protection devices (e.g., thermal relays), set the protection parameters according to the rated current of the motor to prevent equipment damage caused by material overload.
4. Commissioning and Trial Operation
4.1 No-Load Commissioning
Manually rotate the screw shaft before no-load operation to confirm there is no jamming. After starting the equipment, monitor the motor operating current (which should be ≤ 70% of the rated current) and check the bearing temperature (≤ 70℃). Immediately shut down and adjust if abnormal vibration occurs (amplitude ≤ 0.1mm).
4.2 Load Trial Operation
Gradually increase the material conveying capacity to the rated value, with a running time of no less than 2 hours. Focus on checking whether the material is conveyed evenly and whether there is any material leakage. Simultaneously, monitor the temperature rise of the motor and bearings, and the noise level (≤ 85dB). After the trial operation, fasten all connectors and clean residual materials inside the equipment to prepare for formal operation.
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