Overseas Client Visits TOTEM Machinery for On-Site Inspection — Coal Mine Rotary Drum Screen Successfully Assembled and Tested

Recently, our client from Novosibirsk, Russia visited the Luoyang production base of Shanghai TOTEM Machinery Co., Ltd. to check and accept the coal mine rotary drum screen manufactured by our company for him. The content of this acceptance inspection covered complete machine assembly, run-out testing, installation of the cylinder lining, feeder assembly, commissioning of the sprocket drive system, and confirmation of the welding quality of the tooth segments.

The most important technical challenge in this project is the alignment and run-out control of the two cylinders. Due to the large size of the equipment, even a slight deviation in the cylinder body can directly affect the rotational stability and service life of the entire machine. To ensure the two cylinders are aligned along the same straight line, our engineering team employed a multi-process inspection approach, which includes benchmark review, end-face alignment, inner wall straightness measurement, and multiple run-out tests. The entire process was repeatedly calibrated, and ultimately, the assembled cylinders fully met the design requirements within the specified run-out tolerance range. The client highly praised our technology.

After assembling the cylinder, it is placed on the base frame, and the angle is positioned by the roller support frame. The engineer then hoisted and installed the feeder into the interior of the cylinder. As the screening feeder is fixed by support frames at both ends, the inner space is narrow and the structure is complex, so after all the inner components are in the correct position, we conducted multiple interference rechecks between the cylinder lining and the drum feeder, as well as between the liner plates and the mill shell, to ensure that there is no friction or collision during the rotation process. This is also an important precondition to guarantee long-term stable operation.

Then comes the most challenging part of the entire machine assembly — the double end covers assembled simultaneously. Due to the large size and heavy weight of the end plates, the method of “unloading at one end and loading at the other” must be adopted, and both sides promote the assembly process at the same time. This process requires a high level of experience and rhythm, so our team formulated the plan in advance and adjusted the assembly force in time, which made the overall end-cap assembly completed successfully in one attempt.

After finishing the main structure of the cylinder, we move to the installation phase of the sprocket and transmission parts: the sprocket shaft passes through the chain wheel and is fixed on the frame together with the sprocket bearing housing. The engineer optimized the inner oil circuit and the labyrinth seal structure of the bearing block, ensuring that the equipment maintains reliable lubrication and dust-proof sealing performance under long-term high-load operation.

In terms of the tooth section installation, our team cut, welded, and assembled the tooth segments with the chain based on the on-site dimensions. We conducted a round-circumference inspection and a chain-meshing degree check to ensure smooth rotational drive.

Eventually, we came to the final stage — the trial run! The engineer conducted a comprehensive observation and recording of the rotational stability, chain–sprocket meshing accuracy, chute feeder operating condition, liner clearance, and overall transmission efficiency. The trial run successfully passed the acceptance without any component interference or abnormal vibration. Our clients gave full recognition to TOTEM’s engineering capability, quality system, and assembly level.