High-efficiency water-saving separation screen for starch slurry and residue and separation method

Abstract

The present disclosure relates to the technical field of food equipment design and processing, and provides a high-efficiency water-saving separation screen for starch slurry and residue which includes a horizontal screen drum, a screen mesh, a screw propelling extrusion rod, a rotation drive unit and a flushing spray pipe; one side of the horizontal screen drum is provided with a feeding inlet, and the other side of the horizontal screen drum is provided with a slurry outlet and a residue outlet; the screen mesh is in a cone shape, and the cross-sectional diameter of the screen mesh gradually decreases from the feeding inlet to the residue outlet; the screw propelling extrusion rod is arranged in the screen mesh and includes a screw propelling extrusion rod shaft and a screw blade; the rotation drive unit drives the screen mesh and the screw propelling extrusion rod to rotate in opposite directions; and the flushing spray pipe is used for flushing slurry and residue on the screen drum. The present disclosure further provides a separation method adopting the aforementioned separation screen. The synergistic effects of mechanical disturbance and hydraulic overflow washing and screening are simultaneously exerted by the screen, compared with traditional curved surface screens and high-speed centrifugal screens, the usage amount of clean water and the generation amount of wastewater can be reduced, and the concentration of obtained starch slurry is increased; and the moisture content of potato residue extruded and separated out by the screen is low, and thus subsequent utilization is facilitated.

Claims

1. A high-efficiency water-saving separation screen for starch slurry and residue, comprising: a horizontal screen drum, one side of the horizontal screen drum being provided with a feeding inlet, and an other side of the horizontal screen drum being provided with a slurry outlet and a residue outlet; a screen mesh, arranged in the horizontal screen drum, having a cone shape, with a cross-sectional diameter of the screen mesh gradually decreasing along an axis of the cone from the feeding inlet to the residue outlet, wherein the slurry outlet is provided on a position vertically between highest and lowest points of the screen mesh; a screw propelling brush, fixed on an outer side of the screen mesh to rotate synchronously with the screen mesh; a screw propelling extrusion rod, arranged in the screen mesh and being coaxial with the screen mesh, including a screw propelling extrusion rod shaft and screw blades, with a first space between the screw blades and a second space between the screw propelling extrusion rod and the screen mesh both gradually decreasing towards the slurry outlet and the residue outlet; a rotation drive unit, configured to drive the screen mesh and the screw propelling extrusion rod respectively to rotate in opposite directions; and a flushing spray pipe, arranged at a top of the horizontal screen drum, including multiple spray nozzles, with a density of the spray nozzles increasing towards the side with the slurry outlet and the residue outlet.

2. The high-efficiency water-saving separation screen for starch slurry and residue according to claim 1, wherein the rotation drive unit is fixed outside a wall of the horizontal screen drum at the feeding inlet end, and the rotation drive unit comprises two coaxial parallel driving wheels which are respectively connected to a driven wheel of the screw propelling extrusion rod and a screen mesh driven wheel sleeving the screw propelling extrusion rod shaft through belts.

3. The high-efficiency water-saving separation screen for starch slurry and residue according to claim 1, wherein the screen mesh is supported by a plurality of rings of different diameters and cross bars connecting the rings, the rings are connected to a bearing sleeving the screw propelling extrusion rod shaft through a plurality of spokes, and the bearing is driven by the rotation drive unit to rotate.

4. The high-efficiency water-saving separation screen for starch slurry and residue according to claim 1, wherein the screen mesh is made of high-strength nylon or steel wires or alloy steel wires, and a hole size of the screen mesh is between 120 mesh and 140 mesh.

5. The high-efficiency water-saving separation screen for starch slurry and residue according to claim 1, wherein a main body of each of the screw blades is made of steel, and is coated with a wear-resistant rubber layer.

6. The high-efficiency water-saving separation screen for starch slurry and residue according to claim 1, wherein a bottommost portion of the horizontal screen drum at the slurry outlet end is provided with a complete emptying valve.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic structural diagram of a high-efficiency water-saving separation screen for starch slurry and residue according to an embodiment of the present disclosure.

(2) FIG. 2 is a schematic side view (a feeding inlet end) of an embodiment.

(3) FIG. 3 is a schematic side view (a slurry outlet end) of an embodiment.

(4) Wherein, 1. Horizontal screen drum, 2. Screen mesh, 3. Screw propelling brush (blade outside screen mesh), 4. Screw propelling extrusion rod, 5. Screw blade, 6. Spoke for screen mesh supporting ring, 7. Extrusion rod driven wheel, 8. Screen mesh driven wheel, 9. Rotation drive unit, 10. Belt, 11. Flushing spray pipe (clean water pipe), 12. Fixing column, 13. Clean water inlet hole, 14. Residue outlet, 15. Slurry outlet, 16. Feeding inlet, 17. Complete emptying valve.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(5) Specific embodiments of the present disclosure will be described in detail with reference to specific accompanying drawings below. It should be noted that the technical features or combinations of technical features described in the following embodiments should not be considered as isolated, and they can be combined with each other to achieve better technical effects. In the accompanying drawings of the following embodiments, the same reference numerals appearing in the accompanying drawings represent the same features or components, which can be applied to different embodiments.

(6) As shown in FIG. 1, an embodiment of the present disclosure provides a high-efficiency water-saving separation screen for starch slurry and residue which includes a horizontal screen drum 1, a screen mesh 2, a screw propelling extrusion rod 4, a rotation drive unit 9, a flushing spray pipe 11 and a base.

(7) Preferably, the horizontal screen drum 1 is installed on the base. A feeding inlet 16 is arranged at one side of the horizontal screen drum 1, a slurry outlet 15 and a residue outlet 14 are arranged at the other side of the horizontal screen drum 1, the horizontal height of the slurry outlet 15 is located between the highest horizontal position and the lowest horizontal position of the screen mesh 2, and the feeding inlet 16 is located at the middle-upper part of the horizontal screen drum 1. The bottommost portion of the horizontal screen drum 1 is provided with a complete emptying valve 17 located below the slurry outlet 15, as shown in FIG. 3.

(8) Preferably, the screen mesh 2 is in a cone shape, and is supported by a plurality of rings of different diameters and cross bars connecting the rings, the rings for supporting are connected to a bearing sleeving the screw propelling extrusion rod 4 through a plurality of spokes 6, and the bearing is connected to the rotation drive unit 9. It should be noted that the screen mesh 2 and the screw propelling extrusion rod 4 may be connected in a variety of ways, which is not limited to the preferred embodiment, as long as the screen mesh 2 and the screw propelling extrusion rod shaft can coaxially rotate in opposite directions.

(9) The diameter of the screen mesh 2 is gradually decreased towards the residue outlet 14, and a screw propelling brush 3 is installed on the outer side of the screen mesh 2 and can propel starch slurry in the horizontal screen drum 1 to the slurry outlet 15. Slurry and residue on the screen mesh 2 are flushed by the flushing spray pipe 11 at the top of the horizontal screen drum 1. The closer to the residue outlet 14, the larger the density of spray nozzles. The flushing spray pipe 11 can be fixed at the top of the horizontal screen drum 1 through fixing columns 12, and communicates with the interior of the horizontal screen drum 1 through clean water inlet holes 13.

(10) The screen mesh 2 is preferably made of high-strength nylon or steel wires or alloy steel wires, and the mesh size of the screen mesh 2 is between 120 mesh and 140 mesh.

(11) The screw propelling extrusion rod 4 is connected with the rotation drive unit 9, and the rotating direction of the screw propelling extrusion rod 4 is opposite to the screen mesh 2, which leads the potato residue in the screen mesh 2 are propelled and extruded from the residue outlet 14.

(12) The spacing of the screw blade 5 of the screw propelling extrusion rod 4 and the space between the screw propelling extrusion rod 4 and the screen mesh 2 are decreased gradually towards the residue outlet 14, the moisture content of the discharged potato residue is lowered, and the yield of starch is increased by extruding wet potato residue by the screw blade 5, the screen mesh 2 and the wall of the horizontal screen drum 1. A main body of the screw blade 5 is made of steel, and is preferably covered with a wear-resistant rubber layer.

(13) As shown in FIG. 2, the rotation drive unit 9 is used for driving the screen mesh 2 and the screw propelling extrusion rod 4, and can adopt a variety of drive modes. The rotation drive unit 9 is preferably fixed outside the wall of the horizontal screen drum 1 at the feeding inlet 16 end and provided with two coaxial parallel driving wheels which are respectively connected to a screw propelling extrusion rod driven wheel 7 and a screen mesh driven wheel 8 sleeving a screw propelling extrusion rod shaft through belts 10.

(14) An embodiment of the present disclosure provides a high-efficiency water-saving starch slurry and residue separation method adopting the above-mentioned high-efficiency water-saving separation screen for starch slurry and residue, and the method specifically includes:

(15) 1. A machine is turned on, a complete emptying valve 17 is closed, starch slurry and residue enter a screen drum 1 from a feeding inlet 16, and a screen mesh 2 and a screw propelling extrusion rod 4 start to rotate under the action of a drive unit 9.

(16) 2. On the screen mesh 2, part of the starch with small granules in the starch slurry and residue pass through the screen mesh 2 with water flow, remaining slurry and residue remain on the screen mesh 2, and then starch is continuously pass through the screen mesh 2 under the combined action of rolling of the screen mesh 2 and the screw propelling extrusion rod 4.

(17) 3. Below the screen mesh 2, the starch slurry level keeps rising until the liquid level reaches the horizontal position of a slurry outlet 15, and then the starch slurry begins to overflow and be discharged. When the starch slurry is at the highest liquid level, a section of screen mesh 2 at the feeding inlet 16 end can be submerged. The starch slurry and residue on the submerged screen mesh 2 can be washed repeatedly to separate most of the starch granules from the potato residue. A screw propelling brush (blade outside screen mesh) 3 on the periphery of the screen mesh 2 pushes the starch slurry to move toward the slurry outlet 15 to prevent the starch slurry from accumulating.

(18) 4. The screened-out potato residue continuously moves toward a residue outlet under the push of the screw propelling extrusion rod 4. As the horizontal position of the cone-shaped screen mesh surface rises, the potato residue on the screen mesh 2 leaves the slurry liquid level, at this time, the slurry and residue on the screen mesh 2 are washed by spray nozzles of the flushing spray pipe (clean water pipe) 11 to further enable the starch granules in the slurry and residue to pass through the screen mesh 2.

(19) 5. The potato residue on the screen mesh 2 is extruded by the continuously retracting screw blade 5 and the screen mesh 2, so that the moisture in the potato residue is reduced, and the potato residue is finally discharged from the residue outlet 14 of the screen drum 1.

(20) 6. When the screening operation is completed, the complete emptying valve 17 is opened, and the machine is turned off when all the starch slurry and the potato residue are discharged.

(21) The following table shows the comparison results of the present disclosure and a traditional curved mesh screen:

(22) TABLE-US-00001 Separation screen of Traditional the present curved Item disclosure mesh screen Cleaning water ≤0.8 ≥1.5 consumption (tons of clean water/tons of fresh potatoes) Baume degree of ≥6.5 ≤3.5 starch slurry (°Bé) Moisture content of ≤89 ≥94 potato residue (%)

(23) According to the present disclosure, the screen mesh and the screw propelling extrusion rod rotate to propel the starch slurry below the screen and the potato residue above the screen to move toward discharge outlets (the residue outlet and the slurry outlet), and the synergistic effects of mechanical disturbance and hydraulic overflow washing and screening are exerted. Compared with traditional curved mesh screens and high-speed centrifugal screens, the separation screen can reduce the usage amount of clean water and the generation amount of wastewater, and the concentration of obtained starch slurry is increased. Meanwhile, the moisture content of the potato residue separated out by the screen through extrusion is low, and subsequent resource utilization is facilitated.

(24) Although several embodiments of the present disclosure have been given herein, those skilled in the art should understand that the embodiments herein can be changed without departing from the spirit of the present disclosure. The above-mentioned embodiments are only exemplary, and the embodiments herein should not be used as a limitation to the scope of the present disclosure.