Features
The Model 1384 Continuous Rotary Pressure Mixer is used for mixing and dispensing polysulfide or two part compounds. The unit consists of a panel mounted meter assembly, an air driven mixing and dispensing unit and material supply pumps. The Model 1384 Mixer is specifically designed to accurately meter and blend the new high standard quality sealant compounds and to insure that their ultimate physical properties are consistently obtained in production. This result is accomplished by a positive volume displacement system linking the base and accelerator meters together.
Movement of the valve handle, at the mixing head controls the entire system including material supply pumps, pressures, material flow, and mixer RPM. These are visually checked by gauges on the meters and mixing head. This single valve action provides uniform operation of all the systems and a positive shut off with the absence of back pressures.
The mixing head is designed to handle low to high viscosity compounds and may be cooled by refrigerated water. Positive shut off valves, positioned at the mixing head inlets, prevent compounds from entering the mixing chamber unless the nozzle valve is actuated.
Material Supply Pumps:
A double acting material supply pump, mounted on a double post elevator, which prevents jamming or canting of follower plate, is used on the 55 gallon drums (base material).
A double acting material supply pump is used on the 5-gallon pails (accelerator material).
The pump tube assemblies have a ball and check system, which gives a double acting stroke.
The pump air motor creates a reciprocating action of the pump piston. Due to the double action, the material is sucked into the lower portion and extruded from the upper portion. This occurs on both up and down strokes.
Elevators
The elevators are air powered and provide a means for raising and lowering the pump and follower plate into a drum. The follower plate is attached to the elevator, which has a bleed valve and blow off connection. In placing control valve in the “down” position, open bleed valve until all the air is bled off the top of the material and close valve.
In removing empty drums, place control valve in “up” position. This will apply air to the elevator and place air into the drum through the “blow off” connection. This will break the suction between the follower plate and the bottom, allowing the Dump and follower plate to rise freely. Each pump assembly has an air pressure regulator and air pressure gauge.
Metering Assembly
The positive displacement metering assembly delivers to the mixing head assembly the accurate volume amounts of base and accelerator compounds. The base and accelerator meter piston rods are connected to the ratio compensatory and are actuated simultaneously to insure the accuracy of the compound delivered to the mixing head. The base compound, which is delivered by pump pressure to the base meter, pushes on one side of base piston. The other side of the piston sends the volume amount of compound to the mixing chamber. Due to the mechanical connection of the piston rods, the accelerator meter reacts the same way. Therefore, the base pump pressure controls the mixing material flow rate. The accelerator pump pressure is adjusted to fill only the accelerator meter and “balance” the system.
The four-way valve in the meter controls the continuous flow of compounds. At the end of each stroke of the meter piston a “poppet” is actuated which changes the direction of the air cylinder assembly. The four-way valve rod ends of both the base and accelerator meters are connected to this air cylinder. Therefore, when the change of direction occurs, both base and accelerator meter pistons and four-way valves shift simultaneously and give a constant proportional flow of compounds to the mixing chamber.
The metering gauges are attached only to the accelerator meter. Due to the mechanical linkage between meters, the pressure exerted by the base meter is transferred to the accelerator system. If the accelerator meter piston rod is moving the right gauge is indicating the back pressure of the accelerator compound flowing to the mixing head. At this time the left gauge is “balanced” by means of adjusting the accelerator pump air pressure. If the accelerator meter piston rod is moving to the left, the left-hand gauge is indicating the pressure of the accelerator compound flowing to the mixing head.
Mixing Head Assembly
This assembly consists of an air motor, tachometer, shut off valves, rotor housing, rotor, cap, and valve handle to control flow at the nozzle.
The base and accelerator compounds are supplied from the meters separately through the base shut-off valve and the accelerator shut-off valve into the mixing chamber. The air motor drives the rotor that thoroughly blends the base and accelerator compounds together and dispenses it out through the nozzle.
The mixing head cap has tapered valve stem and handle. Movement of the handle not only controls the flow at the nozzle, it strikes an air “poppet”. The “poppet” starts or stops all air supply to the shut-off valves, mixing motor and material pumps. This prevents any “pressure build-up” in the entire system.
For more information about these products contact Bergdahl Associates, Inc.