The Repair of Paddle Dryer's Shaft

Hollow Paddle dryer is a kind of low-speed powder dryer machine with a stirring paddle installed inside the equipment, so that the wet material can fully contact with the heat carrier and the hot surface under the agitation of the paddle, so as to achieve the purpose of drying. The structure is generally horizontal , two-axis or four-axis. Hollow Paddle Drying Machine are divided into hot air type and conduction type.

The shaft of the paddle dryer in a certain company has been worn out. At the beginning of 2023, our company received a call from the person in charge of the company, asking whether our technology can solve the problem of the shaft wear of the paddle dryer. After initial communication with the person in charge of the company, I learned that the shaft of the paddle dryer is now worn and the bearing cannot be fastened. The relevant personnel and leaders of that company attach great importance to this matter. In order to avoid greater losses to the company's production, the relevant leaders and our engineers conducted an in-depth analysis and discussion. Since the equipment does not have the conditions for on-site disassembly, the disassembly and offline maintenance period is long and consumes a lot of manpower and material resources, which seriously affects the production and overall efficiency of the enterprise. After conducting technical exchanges and analyzing the cause of the failure, the relevant leaders learned that our company's technology can repair the shaft wear of the paddle dryer within eight hours without dismantling the equipment as a whole under the premise of ensuring the quality and effect of use. , decided to use carbon nano-polymer material application technology for online quick repair.

Main Points of Paddle Dryer Shaft Wear Repair:
Online repair is based on the unworn position on the shaft of the paddle dryer to ensure that the coaxiality after repair meets the operating range of the equipment and meets the requirements for bearing assembly, so as to achieve rapid production recovery and reliable and effective repair.
(1) Coaxiality after repair: Use the unworn part on the shaft as the benchmark for restoring coaxiality, and combine with "Sorley Tooling Repair Process" to ensure the coaxiality after repair.
(2) Shaft diameter after repair: the effective contact area of the repaired part is restored by using the plasticity of the carbon nanopolymer material combined with the fitting relationship of the parts;
Bearing installation and fixation: After heating the bearing, take the method of hot loading, so as to avoid damage to the bearing caused by violent assembly.
Paddle dryer shaft wear repair steps:
(1) Degrease the worn surface of the paddle dryer shaft until the oil stains are carbonized and there is no spark splashing;
(2) Grinding the repaired surface to achieve roughness and see the original metal color;
(3) Use the unworn part on the shaft to determine the coaxiality of the repaired part;
(4) Determine the installation position of the empty test tooling;
(5) Harmonize carbon nanopolymer materials;
(6) The coating material on the repaired part is uniform and free of pores;
(7) Coating Soleil release agent on the inner surface of the tooling;
(8) Install Soleil special tooling to the pre-installation position;
(9) After the material is cured, check the size and remove excess material;
(10) After the repair is completed, the bearing is thermally installed.