The bearing grease capping machine is a specialized device used in the installation of seal assemblies for railway truck bearings. Over time, during operation, the seal cover assembly often experiences misalignment and deviation, leading to component failure, increased material costs, production delays, and even compromised bearing quality. Additionally, after greasing, the bearings cannot be automatically reset to the center of the material path, making it difficult to complete the cutting process. As a result, operators are forced to manually cut the excess, which increases labor intensity due to the weight of the bearings and negatively affects production efficiency.

To address these issues, the technical team thoroughly analyzed the challenges encountered during the bearing installation process and optimized the design of the uniform grease capping machine. The improvements include:

1. Revising the layout and support surface of the gland cylinder to enhance system rigidity and stability, ensuring accurate centering even under frequent pressure shocks.
2. Replacing the original dual-motor drive with a single-motor system, resulting in a more compact design, reduced axial space, and significant energy savings.
3. Adjusting the cylinder stroke to ensure that the bearing gland is properly positioned within the material channel after greasing.
4. Introducing an elastic mechanism before the gland, where spring force helps pre-position the bearing accurately (guided by splines), preventing misalignment during movement.

The working principle involves placing the sealing cover assembly in the gland seats on both sides. When loading, the bearing inner assembly moves into position. Under hydraulic pressure, the gland cylinder piston moves rightward, causing the grease conflicting piece to contact the left end of the bearing. This pushes the inner component to the right, where it meets the right-side conflicting piece. The spring applies pressure, positioning the component correctly before the gland is applied. A signal is triggered when the block presses switch K2, indicating the completion of the capping process. The motor drives the pulleys, transferring torque through a spline shaft, allowing the bearing to rotate and receive grease. The grease application time is adjustable between 0–3 minutes, with a spindle speed of 150 r/min. After greasing, the cap cylinder retracts, triggering switch K1. The reset cylinder then moves the bearing back to its initial position, releasing switch K3 and signaling the end of the cycle.

The improved uniform grease capping machine not only ensures better quality and smoother loading/unloading but also significantly reduces energy consumption and increases production efficiency. By addressing pressure deviation and misalignment issues, this machine offers a more scientific and practical solution for bearing sealing operations.

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