The present invention provides a particle packing apparatus which can pack uniformly particles of catalyst, etc. without breaking the particles. The particle packing apparatus for packing particles into a vessel, comprises: a base held at a fixed position with respect to the vessel; a distributor which is rotational symmetrical to a central axis extended vertically and distributes the particles; a bearing fixed to the base and holding the distributor rotatably; a particle supplying unit fixed to the base, being rotational symmetrical to the central axis, having a bottom opening being smaller than an inner diameter of the bearing and supplying the particles to the distributor through the bottom opening; and a motor rotating the distributor.

Various embodiments are directed to unloading system and methods of using the same. In various embodiments, an unloading system comprises a trailer bed configured to receive a container thereon, wherein the trailer bed comprises one or more joints configurable between a plurality of joint positions, wherein the trailer bed is configured to lift, tilt, and oscillate at least a portion of the container based on the joints; and an extendable conveyor configured to receive a box that has been released from the container and convey the box away from the trailer bed. Various embodiments are directed to a method comprising tilting the container such that an open end of the container is lower than a closed end of the container, wherein the open end of the container is proximate to an extendable conveyor; and oscillating the container to facilitate release of a box from the container onto the extendable conveyor.

A method of tuning a breakaway force of a synchronization apparatus is provided. The method includes removing a first spring having a first spring constant from a breakaway portion of the synchronization apparatus, where the first spring constant causing the breakaway portion to pivot about a pivot axis relative to a fixed portion at a first breakaway force applied thereto. A second spring is mounted against the fixed portion. The second spring has a second spring constant causing the breakaway portion to pivot about the pivot axis at a second breakaway force that is different from the first breakaway force.