Page 1: Table Of Contents
CORPORATION 2810 E. 5 Avenue, Tampa, Florida 33605 Phone: 813-248-2650 Fax: 813-247-7557 E-mail: Vincent@VincentCorp.com August 16, 2014 OPERATING HINTS MODEL CP-4 SEE NOMENCLATURE DRAWING AT THE END OF THIS MANUAL INDEX START-UP INSTRUMENTATION INVERTER VFD & PLC CONTROL FEEDING BUILDING A PLUG...
Page 2 SCREEN BLINDING CHANNELING PURGING BRIDGING RESISTOR TEETH FLUID INJECTION CORD CUTTER AND STRIPPER VACUUM EFFECT POLYMER NOTCHES WIPERS PRESS AID HYDRATED LIME, GYPSUM, AND ALUM VACUUM EFFECT PRESS LIQUOR SCREEN SCREW-TO-SCREEN CLEARANCE CONE BUSHING WING FEEDERS CLEANING SHAFT SEAL SCREW REMOVAL SCREW REPLACEMENT GEARBOX BASICS PRESS LUBRICATION...
Page 3: Start-Up
The tare weight of the pan should be much less than the weight of the sample which is being dried. Although it is unusual for a CP-4, level controls can be useful in operating a press. With a signal providing the depth of material in the inlet hopper, the speed of the press can be varied to match the flow going into the press.
Page 4: Inverter Vfd & Plc Control
INVERTER VFD & PLC CONTROL While it is not necessary for a CP-4 press, it can be handy to have an inverter VFD to start, protect, and operate the screw press. (A three phase motor is required if a VFD is used, although the power supply can be single phase;...
Page 5: Feeding
For these applications it is advisable to open the cone for a period of one minute before turning off the press. This allows the press to partially empty itself, fluffing the material left in the press. Vincent can provide information for automating this procedure.
Page 6: Building A Plug
A port on the side of the inlet hopper is frequently provided on larger Vincent presses. It is used to view the level of material over the screw. It has a bolted cover because it is rarely used.
Page 7: Pre-Thickening
This is commonly done with a static screen (sidehill or parabolic) or a rotary drum screen (RDS). In the case of very dilute feed to the press, a Vincent Fiber Filter can be used. AIR CYLINDER REGULATOR To regulate the air pressure of the discharge air cylinder, presses are supplied with an air pressure regulator along with a Parker four-way reversing valve.
Page 8: Discharge Cone
In the small CP-4 press, the cone is usually actuated by an air cylinder, although lever arm actuated models used to be available. Presses are generally started up with the cone in the withdrawn position. Once material is going through the press, the cone is set to the closed position.
Page 9 "cone open" period is long enough to dump the press cake that has been formed. Cone Timer panels are available from Vincent at no charge. Care must be taken if a press is to be left running at a very low pressure like 10 psi.
Page 10: Intermittent Operation
a heavy flow of cake. The result will be either high moisture content in the cake or, worse, purging. Where very low air pressures are required for proper operation, it may be practical to put the 4-way valve in a neutral position, half way between open and closed. (Keep in mind that a slug of cake will push the cone open, and it will not re-close on its own afterwards.) Once through start-up, the cone is almost always left in the closed position at...
Page 11: Double Pressing
DOUBLE PRESSING Some processes benefit from what is called double pressing. This means that the cake coming from the press is run through the press a second time (or through a second press). If little moisture is removed in the second (double) pressing, then it is known that the liquid removed in the first pressing is all of the free liquid that there is to be pressed out.
Page 12: Compression
The heat from steam injection can change the chemistry of the material being pressed so that cake with lower moisture content is produced. This blanching or parboiling effect works with fish and orange peel, for example. A quick approximation of what to expect from a screw press is to squeeze as much water out with your fist, and figure that the press will do a little bit better.
Page 13: Capacity Measurement
It has become normal for a variable speed drive (frequency inverter VFD) to be used with Vincent presses. A small change in screw speed, like 20%, will generally not result in a measurable change in performance of the press.
Page 14: Screw Life
Worn screws are either restored locally or returned to Vincent for rebuilding. The maximum cost of a screw rebuild is around one third the cost of a new screw.
Page 15: Screw Configuration
The feeder section of the screw is followed by compression stages where the flights have reduced pitch. The reduction in pitch of the flights results in compression of the material going through the press. CP-4 presses are made with four stages of compression.
Page 16 to avoid excessive compression and jamming. The "sterile cut" is more dramatic. Consult the factory for assistance before making this modification. 4" PIE CUT PIE CUT NOT PIE CUT BUTTERFLY CUT...
Page 17: Jamming
JAMMING Should a press trip out on overload because it has become jammed, a series of steps can be taken to un-jam the press. Generally the easiest thing to do is to reverse the direction of rotation. This will cause the screw to feed material backward into the inlet hopper.
Page 18: Screen Blinding
When a press is operated in the reverse direction it is possible that solid material in the press will be forced against the A Plate. This can damage the shaft seal. For this reason, care should be taken when running the press backwards. Usually three or four revolutions of the screw are sufficient to clear a press.
Page 19: Channeling
Channeling can also be reduced by adding press aid to the material being dewatered, or by reducing the inbound flow to the press. An option NOT available with the CP-4 press is called the Rotating Cone. A tendency for material to channel can be reduced with this option. The cone is caused to rotate so that the relative motion between it and the (stationary) screen breaks the channeling.
Page 20: Bridging
Sometimes bridging will occur at the inlet hopper, stopping the flow of material into the press. This is a common problem with CP-4 presses because the inlet hopper narrows down from the 8" inlet to the 4" screw. Poking with a paint-stir or broom stick is the easiest way to solve this during a simple test.
Page 21: Cord Cutter And Stripper
B plate will pop up slightly as it passes the Cord Cutter. The result is that the material is sheared loose. Very rarely in a CP-4 press there may be a part called Brian's Stripper welded to the B Plate, inside the inlet hopper. It is welded in a position so that the flight lightly kisses the stripper as it goes past.
Page 22: Polymer
1/8" deep, 1-1/2" apart) in the outer edge of the screw flights work well. Typically, notching is done from the B plate to the second resistor tooth. Most Vincent presses are supplied with notches, although they are not common in CP-4 presses.
Page 23: Wipers
GRINDING NOTCHES IN THE FLIGHTS WIPERS Before the advent of notches, wipers, made of UHMW strips or nylon brushes, were (rarely) mounted to the outer perimeter of the screw flights. If at all possible we advise against the use of such wipers because (a) they tend to cause material to co-rotate and jam in the press, (b) they are difficult to replace, and (c) they wear rapidly, resulting in unacceptably frequent shutdowns for replacement.
Page 24: Hydrated Lime, Gypsum, And Alum
Lime has been used successfully in the same manner with potato, onion, tomato, carrot, and pineapple waste. It works well on acidic materials such as onions, strawberries, and coffee bean pulp. Vincent offers lime dosing equipment.
Page 25: Screen
The standard screen used in the CP-4 has a slot width of .015" to .020". With the advent of recovering cooking oil from cooking crumb, a 0.008" screen has been introduced;...
Page 26: Screw-To-Screen Clearance
The most common cause of screen failure ties to failure of the outboard support bushing. If the bushing holding the end of the screw wears out, it can let the screw move enough to rub against the screen. PROFILE BAR (WEDGEWIRE) SCREEN PERFORATED SCREEN WITH REINFORING SHEET SCREW-TO-SCREEN CLEARANCE Generally the clearance between the screw and the screen is 1/32", plus or minus...
Page 27: Cone Bushing
the outside of the screen to the edge of the flight; then subtract the thickness of the wedgewire (0.156") from the measured depth in order to calculate the clearance. If a screw rubs against the screen in a given area, it may be best to grind some off the OD of the screw.
Page 28: Wing Feeders
& paper and alcohol extraction. WING FEEDERS Very rarely in the CP-4 press, there are blades welded to the outside tips of the last two flights of the screw. Called "Wing Feeders", these are mounted parallel to the discharge screen surface.
Page 29: Shaft Seal
There is a YouTube video on the Vincent web site showing disassembly of the CP- 4 press. It is unusual that the outside of the screen needs to be cleaned. A pressure washer or swabbing with acid solution can be used.
Page 30: Screw Removal
If it is tight, the screw is removed using a heavy fine-threaded rod to push the screw out of the gearbox. This rod is threaded through a heavy nut Vincent has provided (only in larger sized gearboxes) inside the hollow bore of the gearbox.
Page 31 A plate. The stub shaft can then be bored out in a large boring mill, and the screw can be repaired at the Vincent factory. JACKING ROD...
Page 32: Screw Replacement
SCREW REPLACEMENT When reinstalling a screw, the screw must be pushed in until the step in the shaft seats against the thrust bearing of the gearbox. This will position the flights of the screw so as not to hit the resistor teeth. Be careful when guiding this step in the shaft through the shaft seals.
Page 33: Gearbox Basics
GEARBOX BASICS Model CP-4 presses use Nord hollow-shaft gearboxes, with C-face mounted motors. Gearboxes are rated, and sold, by their torque rating. The manufacturers generally offer their designs in progressively larger sized castings, or boxes. The larger the box, the larger the torque rating. Each box size will be available with different gear ratios.
Page 34 The air regulator used with the discharge cone air cylinders may have a lubricant jar. If so, Vincent includes a can of light oil along with the air regulator which comes with our screw presses. The jar should be filled when placing the press in service and when the jar is empty, about once a year.
Page 35: Replacement Parts
The specification of these items (gearbox, seals, air cylinder, etc.) is included in the O&M Manual. The most common wear parts in the Vincent CP-4 Press are the screen, the screw, the cone, and the outboard support bushing. Vincent stocks these. Screws are generally rebuilt at the Vincent factory.

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