VC fluidized bed bottom spray coating machine

VC fluidized bed bottom spray coating machine background technology fluidized bed coating machine is a kind of preparation industry on the drying device to improve the production, fluidized bed using atomization operating system and coating method to make granulation, pellets, coating process and drying process in the fluidized bed once completed, reducing energy consumption
.

There are many spray methods for fluidized bed granulation or pellet-making, and the bottom-end spray method is one of
them.

The bottom-end spray method is to set the nozzle in the center of the airflow distribution plate in the guide cylinder, fluidized particles, pellets or tablets in the guide cylinder to accept the adhesive or coating solution method, with high coating efficiency, pellets are not easy to adhere to the advantages, is a commonly used pellet coating method
.

The existing bottom spray coating machine has the following problems: the movement mode of the deflector cylinder to make the VC microcapsule vertically bubbling state is easy to let the particles always be in the lower position of the deflection cylinder, resulting in the need for a long coating operation to achieve the uniformity of the coating of the particles; The spray gun is prone to the situation of blocking the gun, and the coating machine needs to stop and pour out the particles to continue, and the operation is troublesome and time-consuming
.

In order to overcome the prior art VC fluidized bed bottom spray coating machine is easy to make the microcapsule aggregation difficult to spray liquid and easy to block the gun shortcomings, provides a microcapsule can continue to spread out the circulation movement, spray gun spray smooth microcapsule fluidized bed bottom spray coating machine and coating VC production method
.

VC fluidized bed bottom spray coating machine, including the expansion chamber of the upper and lower small prism cavity structure, the lower end of the expansion chamber is an opening, the opening is connected to the air outlet, the left and right walls of the expansion chamber are respectively provided with the lower opening and the air outlet communication, the upper opening towards the left inlet duct of the expansion chamber, the right inlet duct, the expansion chamber is provided with a rectangular sheet air distribution plate, the air distribution plate is provided with a number of ventilation holes parallel to each other through the surface of the plate, The air distribution plate comprises a left air distribution plate on the opening end, the right inlet duct upper opening end, the expansion chamber opening end connected to the left air distribution plate, the right air distribution plate, the air distribution plate, the left air distribution plate, the right air distribution plate ventilation hole and the expansion chamber axis perpendicular, the air distribution plate ventilation hole parallel to the central axis of the expansion chamber, the air supply outlet is provided with a nozzle towards the air distribution plate of the spray gun, the spray gun nozzle is placed in the central axis of the expansion chamber, The cavity of the expansion chamber is provided with a strip of a deflector, the front and rear end of the deflector and the front and rear side walls of the expansion chamber are fixed, the left and right ends of the deflector plate are left at a distance from the left and right walls of the expansion chamber, the right inlet duct upper opening, the left inlet duct upper opening, respectively, located on the upper and lower of
a deflector.

The fluidized bed is externally connected to the air intake treatment system, the air outlet treatment system and the control system
.

The holes in the left air distribution plate, the right air distribution plate, and the air distribution horizontal plate connect the air supply outlet to the expansion chamber, becoming the air supply outlet
in the expansion chamber.

The left air distribution plate, the right air distribution plate, and the air distribution horizontal plate open the air supply mode at different positions in the expansion chamber, the position of the left air distribution plate and the left air distribution plate are relatively staggered so that the wind direction is opposite, and the air distribution horizontal plate is upward: the left air inlet pipe sprays out the air flow from left to right through the left air distribution plate to the expansion chamber, the air outlet sprays air vertically, the air flow is brought to the right inlet duct nozzle, and the air jet from the right air distribution plate drives the air flow from right to left, and the microcapsule follows this air flow , under the action of gravity, it falls to the nozzle of the left supply duct and enters the circulation
again.

A deflector separates different wind directions, causing the airflow in the expansion chamber to form the lateral circulation system shown in the arrow in
the figure.

The circulation of the microcapsule is smooth and barrier-free, not easy to gather, and it is convenient for the spray gun to spray mist evenly; The outside of the spray gun is connected to the spray system, the spray system is the coating spray liquid of the VC microcapsule, the air flow circulation system is added after spraying, the microcapsule is circulated through the spray to ensure that the surface is completely wrapped and coated, and the spray gun is placed outside the circulation space, and the trajectory of the VC microcapsule is not in contact with the movement trajectory of the VC microcapsule, so that the microcapsule moves
smoothly.