The Vincent horizontal continuous press is a dewatering machine with a conveying screw rotating inside a perforated cylinder. Incoming material is forced the length of the machine, liquid &#;press liquor&#;) is expelled through the cylinder wall. The remaining solids (&#;press cake&#;) are discharged at the far end.
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The press is available in sizes with screws ranging from 4&#; to 30&#; in diameter. The screw has a graduated pitch, interrupted flight design. This screw interacts with stationary resistor teeth. These teeth assure that the material to be pressed (1) does not turn (co-rotate) with the screw and (2) is intermixed during passage through the press. Because of this, more material is exposed to the screening surface.
The graduated pitch screw gradually compresses the material as it passes through the main screen cylinder of the press. The press liquor is forced through the perforations in the screen.
The press cake encounters resistance at the discharge of the cylinder in the form of a cone mounted on a ram. As the material reaches the discharge point, the cone exerts final pressing action to achieve maximum dewatering. The cone system allows easy adjustment of the resistance to cake discharge.
This cone assembly may incorporate a unique discharge pinch point, described in a patent as a frustum, the converging angle formed by the cone face and main screen section. The change in direction as the press cake enters this area assures fresh material contact with screen surface. This converging pinch area has proven to give excellent final pressing action.
Air cylinders, springs, or counterweights actuate the cone assembly, depending on the model. It is available in both rotating and non-rotating versions. The standard, non-rotating cone is used for pulpy, fibrous and less slippery materials, while the revolving cone model is required to permit pressing of slippery, low fiber content materials that tend to &#;channel&#; in a standard screw press.
The design features of the Vincent Series VP Presses give greater screen areas than found in conventional presses. The hopper section has a screen area covering 180º of the periphery of the screw to allow drainage of free water. The main screen section has a full 360° screen area, approximately four screw diameters in length. The cone assembly also has a screen area with a separate drain pan.
The standard drive arrangement for the Vincent Press is a gear reducer directly coupled to the screw shaft. Variable speed drive arrangements, although rarely used, are available to allow maximizing capacity as feed characteristics change. This type of drive is recommended either when different products are to be processed or when major seasonal variations occur.
The press is fed from the top at the drive end through a rectangular flanged hopper. The press cake discharges at the far end, between the bedframe beams below the cone section. Press liquor drainage is through standard or sanitary pipe connections; these are attached to the pan under the screen section.
The rated capacity of the Vincent Continuous Screw Press is proportional to the bulk density of the material to be pressed, as well as the slippage characteristic of the material. The ability of the material to give up its moisture, its particle size, and its fibrous content are factors to be considered. The high capacity of this machine, its low head room requirement, as well as low horsepower factor, are some of its many advantages.
The capacity and the water removed during pressing can be varied by adjusting the cone pressure. Adjusting this pressure assures maximum dewatering over a wide range of feed rates, permitting good turndown from rated capacity.
The screen frames can be readily opened or removed for ease of cleaning and screen maintenance. The screens of the Vincent Press are available in a variety of arrangements and screen perforation sizes, commonly in the 0.023&#; to 0.095&#; diameter range. With wedge wire screens, 0.012&#; to 0.030&#; slots are commonly used. Selection is determined by the material being pressed and the desired pressing results.
The Vincent press has been recognized for the exceptionally low maintenance costs associated with it. Easy access to all component parts keeps maintenance time to a minimum. Use of off-the-shelf components (gearbox, bearings, air cylinder, etc.) reduces maintenance costs and assures trouble-free operation. The all-fabricated design facilitates in-plant repairs should they become necessary.
All press models are of fabricated steel design. They are available in all stainless construction, partial stainless, and carbon steel, as follows:
The newest Vincent Press is the TSP Series. These have two overlapping screws. This design offers positive feeding of even very slippery materials. The best dewatering performance over the widest operating range is available in this press. The capacity and performance of the press is sensitive to changes in screw rpm, so the use of a VFD is recommended.
The traditional Vincent Press is the VP. These are differentiated by having screens in the inlet hoppers; a flared section in the main screen just ahead of the discharge cone; a single air cylinder cone actuator; and (usually) a belt drive between the motor and gearbox.
The Series CP (Compact Press) features a hollow shaft gearbox and a simplified cone drive, both of which shorten the frame of the machine. There is no screen in the inlet hopper, and profile bars screens are almost always used. These presses are available only in stainless steel construction.
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The Series KP presses are designed for a &#;soft&#; squeeze. They dewater high throughputs of easily dewatered materials. Instead of a discharge cone, they use a lever actuated stopper plate. Perforated screens are used in almost all cases. Only stainless steel construction is available.
To conduct tests Vincent Corporation maintains laboratory and pilot equipment. Feed rates, moisture contents, percent solids, effluent characteristics, and horsepower requirements can be determined from test data.
A large fleet of rental machines are available for in-plant trials.
Screw presses machine are versatile mechanical devices used in various industries for the separation, dewatering, and extraction of materials. They utilize the principle of mechanical pressure applied through a rotating screw to achieve their desired functions. This article provides an overview of different types of screw presses and their applications.
The single screw press, also known as the continuous screw press, consists of a single helical screw rotating within a cylindrical barrel. This design is simple and widely used in industries like food processing and wastewater treatment. [ Read also: What is a Screw Press for Wastewater Treatment?]
Twin screw presses feature two parallel screws that rotate in opposite directions. This design provides higher pressure and throughput compared to single screw presses. They are commonly used in the food industry for separating liquids from solids, such as in the production of fruit juices.
Screw presses designed for dewatering applications are common in wastewater treatment, pulp and paper, and sludge management. They efficiently separate water from solids, reducing the volume of waste material. These presses can be single or twin-screw and are essential for environmental and industrial applications.
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The expeller press is a specialized screw press primarily used for oil extraction. It employs a continuous feed of raw material into a press chamber with a rotating screw. As the material is transported through the chamber, pressure is exerted, squeezing out oil from seeds and nuts. Expeller presses are crucial in the production of vegetable oils and biodiesel.
A screw extruder is a specialized screw press used in the plastics and food industries for shaping and molding materials. The rotating screw forces the material through a die, resulting in a product with a specific shape or consistency. This process is used in the production of various products, including pasta, snacks, and plastic components.
Screw compactors are designed to compact waste materials like cardboard, paper, and plastic, reducing their volume for efficient storage and transportation. They use a single screw to compress and densify the materials, making them suitable for recycling centers and waste management facilities.
Screw conveyor presses combine the functions of a screw conveyor and a press. They transport material from one location to another while simultaneously exerting pressure to achieve a specific outcome, such as dewatering, mixing, or compaction. They find applications in industries ranging from agriculture to chemical processing.
Screw presses come in various designs and serve a wide range of industrial applications. Each type of screw press has unique features that make it well-suited for specific tasks. Understanding the different types of screw presses and their applications is crucial for selecting the right equipment in various industries, ensuring efficiency and productivity.
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