**Foreword**
Shandong Xianluo Conveying Machinery Co., Ltd. is a leading manufacturer specializing in advanced material conveying systems, including the FU Chain Conveyor (Patent No. 208144), NE and NSE Plate Chain Bucket Elevators (Patent No. 64720), and DS (SDB) Continuous Bucket Conveyors. The company focuses on the design, production, and development of next-generation energy-efficient conveying equipment. As the pioneer, most powerful, largest, and highest-quality conveying enterprise in China, it has set industry benchmarks for performance and reliability.
The efficient operation and long service life of the NE-type chain hoist depend not only on its proper design and high-quality manufacturing but also on correct installation, operation, and maintenance. In the event of sudden failures during operation, identifying the root cause quickly and taking appropriate corrective actions can significantly reduce downtime and losses.
**Pre-Installation Preparation**
Upon receiving the equipment, users should conduct an inventory, categorize, and inspect all components of the elevator. These parts should be stored in a safe and dry location to prevent rust or damage. If any parts are missing or damaged, they must be repaired or replaced before proceeding with installation.
Before starting the installation, carefully check the dimensions between the building structure, foundation, or floor hole and the hoist at the installation site. Pay special attention to whether the driving device's position (left or right) matches the design specifications. If discrepancies are found, measure the actual size and make necessary adjustments to ensure accurate installation.
Ensure that all required tools and materials are prepared in advance. The installation should be carried out by qualified professionals, including fitters, crane operators, electricians, and welders.
During the installation process, the base should be leveled using a leveler. If uneven, use steel plates to adjust it. Then, recheck the foundation bolts according to the hoist’s basic diagram.
The head unit and middle casing should be lifted to their designated positions for installation. In some cases, the middle casing may be installed from the top down, connecting one section at a time.
**Hoist Installation**
First, temporarily secure the tail assembly to the foundation. Then, connect the middle chassis flanges in the correct sequence, adding asbestos rope or other suitable seals between the flanges. For non-standard sections, install them after the standard ones, adjusting as needed based on actual conditions.
Once the middle casing is in place, reconnect the head unit and open the upper cover. The first middle section usually includes an inspection opening located on the lower platform for easy hopper replacement. Every three sections (approximately 7.5 meters), install a rail-equipped central casing. When installing the rail section, ensure the narrow side faces the lifting direction and the wide side is for the return path.
It is crucial to maintain the horizontal alignment of the casing flanges. Use a level gauge to ensure proper leveling and verify that the centerline is perpendicular to the plumb line. The verticality and curvature of the casing must meet the tolerances specified in Table 1.
**Table 1**
| Overall Height (m) | ≤10 | 10–20 | ≥30 |
|--------------------|-----|--------|-----|
| Allowable Deviation (mm) | ±4 | ±5 | ±7–8 |
After adjustment, secure the tail assembly to the foundation and install a positioning device in the middle of the hoist to prevent tilting or shifting. The distance between positioning devices should not exceed 8 meters, with the topmost support placed on the middle casing connected to the upper housing. Ensure the support frame is firmly attached to the building but does not restrict vertical movement.
Due to potential deformation during transport, check the head axle level after fixing the hoist. Ensure the head and tail wheels are properly aligned once leveling is complete.
When installing the drive unit, bolt the platform to the upper housing. If using a three-sided platform, connect the platforms first before securing them to the upper housing. Use supporting channel steel to attach the platform to the drive and middle chassis. Weld the platform and maintenance racks if needed, then install the drive unit. Ensure the motor and reducer output shafts are parallel to the head wheel shaft. The sprocket size should be centered, with a deviation of less than 2 mm. After adjusting the drive chain, secure the base and install protective covers.
Before installing the open chain drive, start the motor to check the rotation direction of the small sprocket. It should match the traction chain’s running direction—moving from the feed port side downward to the discharge port. If the direction is incorrect, rewire and reinstall the drive chain. Once installed, the chain sag should be between 10–30 mm. Secure the lower half of the sprocket cover and add lubricating oil with a kinematic viscosity of 30–40 mm²/s. The drive chain should be immersed in the oil pool up to 6–12 mm.
**Traction Chain and Hopper Installation**
Before installation, check the flexibility of the traction chain joints. If resistance is encountered, clean the rusted areas with gasoline or kerosene and sand them until smooth. Do not apply oil. At the factory, a 4-meter traction chain is often pre-connected for ease of handling. Once installation is complete, open the tail and middle inspection ports, and connect the chain from the tail or middle inspection port. Use two chain hoists to lift the chain into the casing, wrap it around the head wheel, and connect it. Adjust the tail sprocket assembly to the top of its range, ensuring the chain passes around the tail wheel. Lower the tail wheel assembly and ensure the unused tension stroke is at least 50% of the full stroke. Adjust if necessary.
Remove the two traction chains and re-adjust as needed. After the traction chain is installed, proceed with hopper installation.
Once the traction chain and hoppers are in place, install the lever and heavy box, along with the weights. During hopper installation, connect the inlet and outlet ports to the supporting equipment to ensure smooth material flow. The angle between the non-standard connection section and the horizontal plane should be greater than 50°.
Ensure the hoist can be manually rotated without obstruction, and that no moving parts collide with fixed parts. If everything meets the requirements, close the covers and use asbestos gaskets or other seals. Tighten all bolts, remove any debris inside the hoist, and lubricate the system. Conduct a two-hour no-load test to confirm proper operation.
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