Starch emulsion filter pressing device

Abstract

The invention discloses a starch emulsion filter pressing device which comprises a rack, a tank body is installed on the rack, a liquid discharging pipe is connected to the bottom of the tank body, a switch valve is installed on the liquid discharging pipe, a top cover is connected to the top of the rack through a hydraulic cylinder, a sealing ring is installed on the outer side of the top cover and makes sliding contact with the inner wall of the tank body, and a first rotating motor is installed on the top of the top cover. A first paddle is mounted at the bottom of the top cover, the first rotating motor is connected with the first paddle, a liquid inlet pipe and an air inlet pipe are mounted on the top cover, a filter layer is mounted at the bottom of the tank body, a second rotating motor is mounted in the center of the filter layer in an embedded manner, the second rotating motor is connected with a second paddle, and the second paddle is in sliding contact with the surface of the filter layer; an electric control valve is arranged at the bottom end of the side wall of the tank body and connected with a discharging pipe. The defects in the prior art can be overcome, the occupied area of equipment is reduced, the uniformity of filter-pressing dehydration is improved, and dehydrated starch is rapidly and thoroughly discharged.

Description

Technical Field

[0001] The invention relates to starch processing equipment, in particular to a starch emulsion pressure filtration device. Background Art

[0002] In the starch production process, impurities and soluble substances in the starch need to be removed by washing, and then the finished starch is obtained by dehydration and drying. Centrifugal dehydration and filter press dehydration are two commonly used dehydration methods. Filter press dehydration has high dehydration efficiency, but the equipment occupies a large area, the dehydration rate of different areas of the filter cake varies greatly, and the filter cake residue is not easy to clean. How to improve the existing filter press equipment according to the characteristics of starch emulsion has become one of the research hotspots at this stage. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a starch emulsion pressure filtration device, which can solve the shortcomings of the prior art, reduce the equipment footprint, improve the uniformity of pressure filtration dehydration, and discharge the dehydrated starch quickly and completely.

[0004] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows.

[0005] A starch emulsion filtration device comprises a frame, a tank body is installed on the frame, a drain pipe is connected to the bottom of the tank body, a switch valve is installed on the drain pipe, the top of the frame is connected to a top cover through a hydraulic cylinder, a sealing ring is installed on the outer side of the top cover, the sealing ring is in sliding contact with the inner wall of the tank body, a first rotating motor is installed on the top of the top cover, a first paddle is installed on the bottom of the top cover, the first rotating motor is connected to the first paddle, a liquid inlet pipe and an air inlet pipe are installed on the top cover, a filter layer is installed at the bottom of the tank body, a second rotating motor is embedded in the center of the filter layer, the second rotating motor is connected to a second paddle, the second paddle is in sliding contact with the surface of the filter layer, and an electric control valve is provided at the bottom end of the side wall of the tank body, and the electric control valve is connected to a discharge pipe.

[0006] Preferably, a plurality of downward air jet pipes are evenly arranged on the bottom edge of the top cover, the air inlet pipe is connected to the air jet pipe, and an exhaust hole with a solenoid valve and a one-way exhaust valve is arranged on the top cover.

[0007] Preferably, a first jet hole is arranged at the bottom end of the jet pipe, and a second jet hole is arranged on the side wall of the jet pipe, and the jetting direction of the second jet hole is the same as the rotation direction of the starch emulsion.

[0008] Preferably, a mesh plate is provided on the top of the first blade.

[0009] Preferably, the bottom surface of the second blade is connected to a mounting rod via a spring, a scraper is fixed on the mounting rod, a spring sheet is installed on the side of the scraper facing away from the rotation direction of the second blade during centrifugal dehydration, a flexible brush head is installed under the spring sheet, and the spring is in a compressed state, and the spring presses the scraper and the flexible brush head to the surface of the filter layer.

[0010] Preferably, a through groove is provided on the upper portion of the scraper, and the through groove is located above the spring piece.

[0011] Preferably, the filter layer includes a base with water permeable holes, a bracket fixed at the center of the base, a second rotating motor installed on the top of the bracket, an elastic mesh plate fixed between the edge of the base and the bracket, and a filter cloth laid on the top surface of the elastic mesh plate.

[0012] Preferably, a vibration exciter is provided on the bottom surface of the elastic mesh plate, and the vibration exciter is installed on the base.

[0013] The beneficial effect brought by adopting the above technical solution is that the present invention integrates the centrifugal dehydration principle into the filter press device, effectively reducing the volume of the equipment. At the same time, the traditional centrifugal dehydration structure is improved according to the process of filter press dehydration, making it more suitable for the process of filter press dehydration and improving the dehydration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of a specific implementation mode of the present invention.

[0015] Figure 2 It is a structural diagram of the jet pipe in a specific embodiment of the present invention.

[0016] Figure 3 It is a structural diagram of the first blade in a specific embodiment of the present invention.

[0017] Figure 4 It is a cross-sectional view of the second blade in a specific embodiment of the present invention (the second blade is in a state of centrifugal dehydration).

[0018] Figure 5 It is a structural diagram of the filter layer in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0019] The existing filter press is a multi-chamber structure connected in series, and the opening and closing of the chambers requires a large operating space. In addition, due to the process characteristics of the filter press, the pressure received by the center of the filter cake obtained by the filter press is greater than that of the edge, so the water content of the edge of the filter cake is significantly higher than that of the center. At the same time, the pressure inside the filter cake increases during the filter press process, so the water inside the filter cake is more difficult to squeeze out than the water on the surface, resulting in the water content inside the filter cake being significantly higher than that on the surface.

[0020] Since the dehydration principle of the centrifugal dehydrator is completely different from that of the filter press, the above-mentioned problems of the filter press do not exist. However, the dehydration rate of the centrifugal dehydrator is limited by the motor speed and is generally not as high as that of the filter press.

[0021] Since the structures and working principles of filter presses and centrifugal dehydrators are completely different, it is impossible to directly install a centrifugal mechanism in a filter press. Even if the filter press is simply modified and the centrifugal mechanism is installed in it, it will affect the working pressure of the filter press and greatly reduce the dehydration efficiency.

[0022] The present invention designs the filter press through a completely new idea, referring to Figure 1 We use the tank body 2 of the centrifugal dehydrator to implement the filter pressing process. The filter layer 12 set on the side wall of the traditional centrifugal dehydrator is installed at the bottom of the tank body 2 and connected to the drain pipe 3. Then, a hydraulic cylinder 5 is installed on the top cover 6 to realize the up and down movement of the top cover 6 to realize the filter pressing operation. A liquid inlet pipe 10 is installed for feeding. In order to ensure the stability of the tank body 1 during the filter pressing process, a frame 1 is installed on the outside of the tank body 1. The first blade 9 and the second blade 14 are installed on the top and bottom of the tank body 1 respectively to realize the centrifugal dehydration function.

[0023] Reference Figure 2-5 In order to further improve the centrifugal dehydration effect, an air jet 17 is installed on the bottom edge of the top cover 6, the air inlet pipe 11 is connected to the air jet 17, and an exhaust hole 18 is provided on the top cover 6, and the exhaust hole 18 is provided with a solenoid valve 19 and a one-way exhaust valve 20. During the centrifugal stirring process, by injecting air into the starch emulsion, the flow of the air flow is used to drive the emulsion to flow in a vertical direction. Because the filter layer 12 is at the bottom of the tank body 1, this vertical flow can make the upper layer of the emulsion flow to the bottom of the tank body 1 in a cycle, thereby achieving efficient filtration. At the same time, this circulation trend is used to avoid starch deposition at the bottom of the tank body 1, and maintain the filtration efficiency of the filter layer 12. Two jet holes are respectively provided on each air jet pipe 17, and a first jet hole 21 is provided at the bottom end of the air jet pipe 17, and a second jet hole 22 is provided on the side wall of the air jet pipe 17. The injection direction of the second jet hole 22 is the same as the rotation direction of the starch emulsion. The first jet hole 21 is located below the first blade 9. The second air jet hole 22 sprays air in a horizontal direction, which can increase the horizontal rotation speed of the emulsion in the area between the first blade 9 and the second blade 14 , and improve the rotation uniformity of the emulsion in the entire tank body 1 .

[0024] Since injecting gas into the emulsion will cause a large number of bubbles to appear on the surface of the emulsion, and the bubbles will significantly affect the solid-liquid separation efficiency, and may also cause the tank to be unbalanced during the centrifugal process. Therefore, we install a mesh plate 23 on the first blade 9, and use the rotation of the mesh plate 23 to eliminate the bubbles accumulated on the surface of the emulsion.

[0025] The second blade 14 not only has the function of stirring the emulsion to achieve centrifugal dehydration, but also needs to stir the filter cake in the filter pressing stage, so the second blade 14 is specially designed. A mounting rod 24 with a spring 25 is installed on the basis of the traditional blade, and a scraper 26 is fixed on the mounting rod 24. A spring 27 is installed on the side of the scraper 26 facing away from the rotation direction of the second blade 14 during centrifugal dehydration, and a flexible brush head 28 is installed below the spring 27. The scraper 26 is slidably pressed against the filter layer 12, so that the spring 25 is in a compressed state, and the bottom end of the flexible brush head 28 is located below the scraper 26, so that the flexible brush head 28 is pressed against the surface of the filter layer 12. The scraper 26 and the flexible brush head 28 are both installed through elastic components and pressed against the filter layer 12, which can ensure that the scraper 26 and the flexible brush head 28 can have good sliding contact with the filter layer 12 during centrifugal agitation or filter pressing agitation. By using the through groove 29 provided on the scraper 26 above the spring sheet 27, a flow velocity difference can be formed in different upper and lower regions of the second blade 14, so that the local turbulence generated by the flow velocity difference can be used to clean the surface of the filter layer 12 scraped by the scraper 26. The bottom surface of the scraper 26 is an arc surface, and one side facing the rotation direction of the second blade 14 during centrifugal dehydration is a smooth surface 36, and the other side is a rough surface 37. When the centrifugal dehydration is rotating, the spring 25 is slightly deflected, and the smooth surface 36 at the bottom of the scraper 26 is in sliding contact with the filter layer 12, reducing the sliding friction and protecting the filter layer 12. When the filter press dehydration is performed, after each round of pressurization, the second blade 14 rotates in the reverse direction at a low speed, the spring 25 is slightly deflected, and the rough surface 37 at the bottom of the scraper 26 is in sliding contact with the filter layer 12, increasing the sliding friction and improving the cleaning effect on the surface of the filter layer 12.

[0026] The filter layer 12 is also specially designed. It includes a base 30, a water-permeable hole 31 is provided on the base 30, a bracket 32 ​​is fixed at the center of the base 30, a second rotary motor 13 is installed on the top of the bracket 32, an elastic mesh plate 33 is fixed between the edge of the base 30 and the bracket 32, and a filter cloth 34 is laid on the top surface of the elastic mesh plate 33. Since the filter cloth 34 is laid on the elastic mesh plate 33, it can produce micro deformations of different sizes under the change of downward pressure, and cooperate with the second blade 14 to facilitate the cleaning and collection of starch granules on the surface of the filter cloth 34 after pressure filtration. In addition, according to the actual working conditions, an exciter 35 can be installed on the bottom surface of the elastic mesh plate 33, and the exciter 35 can be used to apply additional vibration to the filter cloth 34 to improve the efficiency of cleaning the surface of the filter cloth 34 and discharging starch.

[0027] The working process of the starch emulsion filtration device designed by the present invention is as follows: the top cover 6 rises to a high position, the exhaust hole 18 is opened, and the starch emulsion is injected into the tank body 1 through the liquid inlet pipe 10, so that the liquid level of the starch emulsion is 1-2 cm below the lower edge of the mesh plate 23. First, centrifugal dehydration is performed. The switch valve 4 on the discharge pipe 3 is opened, and the first rotary motor 8 and the second rotary motor 13 are started, so that the first blade 9 and the second blade 14 rotate at high speed according to the centrifugal dehydration form (the first blade 9 and the second blade 14 rotate in the same direction). At the same time, compressed air is injected into the starch emulsion through the air inlet pipe 11 and the air jet pipe 17, and the emulsion forms a vertical flow trend in the tank body 1 under the drive of the compressed air flow. As the dehydration proceeds, the liquid level gradually decreases, and the top cover 6 is controlled to decrease synchronously with the liquid level, so that the relative position of the liquid level and the mesh plate 23 remains basically unchanged, and the mesh plate 23 is used to eliminate bubbles on the liquid surface. During the centrifugal dehydration process, the flexible brush head 28 is located on the side facing away from the second blade 14. Due to the friction force during the high-speed sliding with the filter cloth 34, the head of the flexible brush head 28 moves away from the second blade 14, thereby creating a certain gap between the flexible brush head 28 and the scraper 26 (see Figure 4 ), due to the fast emulsion flow rate of the upper through groove 29, the emulsion flow rate between the flexible brush head 28 and the scraper 26 is relatively low, thereby generating a local pressure difference, so that the liquid flow will flow from the gap to the direction of the through groove 29, and quickly take the starch precipitate accumulated on the surface of the filter cloth 34 away from the surface area of ​​the filter cloth 34. When the distance between the air jet 17 and the upper edge of the second blade 14 is less than 1 cm, the centrifugal dehydration is completed, the gas injection is stopped, the first blade 9 and the second blade 14 stop rotating, the top cover 6 is pressurized downward, and the filter press dehydration is started. As the top cover 6 is pressurized, the elastic mesh plate 33 produces a slight elastic deformation downward. After maintaining the pressurized state for 2-3 minutes, the top cover 6 begins to release pressure, and the elastic mesh plate 33 recovers, causing a crack between the bottom surface of the filter cake that was originally close to the surface of the filter cloth 34 and the filter cloth 34. Then the first blade 9 and the second blade 14 start to rotate slowly, wherein the first blade 9 maintains the rotation direction of the centrifugal dehydration stage, and the second blade 14 rotates in the opposite direction (the second blade 14 rotates in the opposite direction so that the flexible brush head 28 faces forward, and the scraper 26 behind is used to support the flexible brush head 28 to avoid excessive deformation of the flexible brush head 28 after contact and extrusion with the starch block, thereby damaging the flexible brush head 28), stirring the filter cake, and re-pressurizing the filter cake after the filter cake is broken up, and the above process is repeated 10-20 times according to the process requirements to complete the dehydration. Then open the electric control valve 15 at the bottom of the side wall of the tank body 2, close the switch valve 4 and the solenoid valve 19, and start the first blade 9 and the second blade 14 again according to the filter pressing dehydration working mode, and inject compressed air into the tank body 1 through the jet pipe 17. Driven by the compressed air and stirred by the first blade 9 and the second blade 14, the dehydrated starch block is broken and discharged from the discharge pipe 16.

[0028] The starch emulsion filtration device designed by the invention has high dehydration rate, uniform filter cake water content, can work continuously without frequent shutdown for cleaning filter cloth, and saves manpower.

[0029] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A starch emulsion filtration device, comprising a frame (1), a tank body (2) mounted on the frame (1), a drain pipe (3) connected to the bottom of the tank body (2), a switch valve (4) mounted on the drain pipe (3), characterized in that: The top of the frame (1) is connected to a top cover (6) through a hydraulic cylinder (5), a sealing ring (7) is installed on the outside of the top cover (6), the sealing ring (7) is in sliding contact with the inner wall of the tank body (2), a first rotating motor (8) is installed on the top of the top cover (6), a first paddle (9) is installed on the bottom of the top cover (6), the first rotating motor (8) is connected to the first paddle (9), a liquid inlet pipe (10) and an air inlet pipe (11) are installed on the top cover (6), a filter layer (12) is installed at the bottom of the tank body (2), a second rotating motor (13) is embedded in the center of the filter layer (12), the second rotating motor (13) is connected to a second paddle (14), the second paddle (14) is in sliding contact with the surface of the filter layer (12), an electric control valve (15) is provided at the bottom end of the side wall of the tank body (2), and the electric control valve (15) is connected to a discharge pipe (16).

2. The starch emulsion pressure filtration device according to claim 1, characterized in that: A plurality of downward-facing air jet pipes (17) are evenly arranged at the bottom edge of the top cover (6), the air inlet pipe (11) is connected to the air jet pipe (17), and an exhaust hole (18) with a solenoid valve (19) and a one-way exhaust valve (20) is arranged on the top cover (6).

3. The starch emulsion pressure filtration device according to claim 2, characterized in that: The bottom end of the jet pipe (17) is provided with a first jet hole (21), and the side wall of the jet pipe (17) is provided with a second jet hole (22), and the jetting direction of the second jet hole (22) is the same as the rotation direction of the starch emulsion.

4. The starch emulsion pressure filtration device according to claim 3, characterized in that: A mesh plate (23) is provided on the top of the first blade (9).

5. The starch emulsion filtration device according to claim 3, characterized in that: The bottom surface of the second blade (14) is connected to a mounting rod (24) via a spring (25); a scraper (26) is fixed on the mounting rod (24); a spring sheet (27) is installed on the side of the scraper (26) facing away from the rotation direction of the second blade (14) during centrifugal dehydration; a flexible brush head (28) is installed below the spring sheet (27); the spring (25) is in a compressed state, and the spring (25) presses the scraper (26) and the flexible brush head (28) onto the surface of the filter layer (12).

6. The starch emulsion pressure filtration device according to claim 5, characterized in that: A through groove (29) is provided on the upper part of the scraper (26), and the through groove (29) is located above the spring sheet (27).

7. The starch emulsion pressure filtration device according to claim 6, characterized in that: The filter layer (12) comprises a base (30), the base (30) is provided with a water permeable hole (31), a bracket (32) is fixed at the center of the base (30), the second rotating motor (13) is installed on the top of the bracket (32), an elastic mesh plate (33) is fixed between the edge of the base (30) and the bracket (32), and a filter cloth (34) is laid on the top surface of the elastic mesh plate (33).

8. The starch emulsion pressure filtration device according to claim 7, characterized in that: The bottom surface of the elastic mesh plate (33) is provided with a vibration exciter (35), and the vibration exciter (35) is installed on the bottom bracket (30).

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