A plate and frame filter for filtering a rock candy solution

Abstract

The utility model relates to filter equipment technical field, concretely relates to a kind of plate-and-frame filter of rock sugar solution filtration.The utility model provides a kind of plate-and-frame filter of rock sugar solution filtration, including rack, compacting oil cylinder and filter plate assembly, compacting oil cylinder is located in the side of rack, and the piston rod of compacting oil cylinder is connected with compacting plate, filter plate assembly includes multiple parallelly arranged filter plates, filter frame is clamped between adjacent filter plates, the side of filter plate towards filter frame is equipped with annular clamping slot, annular clamping slot is embedded with elastic snap ring, and filter cloth is fixed with the cooperation of annular clamping slot and elastic snap ring by filter plate;The top of filter frame is provided with the vibration motor of auxiliary filter cake stripping, the inside wall of filter plate is equipped with the push material boss of circumferentially uniform distribution, for auxiliary filter cake stripping;Corresponding annular sealing boss and annular sealing groove are equipped between the contact surface of filter frame and filter plate, water stop rubber strip that expands when meeting water is filled in annular sealing groove.

Description

Technical Field

[0001] This utility model relates to the field of filtration equipment technology, specifically to a plate and frame filter for filtering rock sugar solution. Background Technology

[0002] A plate and frame filter is a general-purpose filtration device that uses filter plates and frames arranged alternately to form a filtration chamber, and uses filter cloth to intercept solid particles and achieve solid-liquid separation. It is widely used in chemical, food processing, and other fields. In rock sugar production, solution filtration is a critical process, requiring efficient removal of impurities such as crystal fragments and sediment to ensure the purity and color of the finished rock sugar. Traditional plate and frame filters typically consist of a frame, a clamping cylinder, filter plate assemblies (including filter plates and frames), and filter cloth. The clamping cylinder pushes a clamping plate to compress the filter plate assembly, forming a sealed filtration space.

[0003] However, existing technologies have the following shortcomings: First, filter cloths are mostly fixed to filter plates with bolts or simple clips, which can easily loosen and fall off due to pressure fluctuations or solution erosion over long-term use, affecting filtration continuity. Second, the filter cake (intercepted solid impurities) adheres to the surface of the filter cloth or filter frame, requiring manual scraping during demolding, which is inefficient and easily damages the filter cloth. Third, the contact seal between the filter plate and the filter frame relies solely on planar compression, which can easily lead to leakage due to wear after prolonged pressure, resulting in a decrease in filtration accuracy. Therefore, it is urgent to optimize the structure of traditional plate and frame filters to improve their sealing reliability, filter cake demolding efficiency, and operational stability. Utility Model Content

[0004] This utility model provides a plate and frame filter for filtering rock sugar solution, aiming to solve the problems of easy filter cloth detachment, difficult filter cake demolding, insufficient sealing performance and inaccurate control of clamping force in traditional plate and frame filters.

[0005] The present invention provides a plate and frame filter for filtering rock sugar solution, comprising a frame, a clamping cylinder, and a filter plate assembly. The clamping cylinder is located on one side of the frame, and its piston rod is connected to a clamping plate. The filter plate assembly includes multiple parallel filter plates, with a filter frame clamped between adjacent filter plates. An annular groove is provided on the side of each filter plate facing the filter frame, and an elastic retaining ring is embedded in the annular groove. The filter plate is fixed with filter cloth through the cooperation of the annular groove and the elastic retaining ring. A vibration motor for assisting filter cake demolding is provided on the top of the filter frame. The inner sidewall of the filter plate is provided with circumferentially evenly distributed pushing protrusions for assisting filter cake demolding. Corresponding annular sealing protrusions and annular sealing grooves are provided between the contact surfaces of the filter frame and the filter plate. The annular sealing grooves are filled with water-swellable sealing strips.

[0006] As a preferred embodiment of this utility model, the filter plate is provided with positioning pins at its four corners, and the filter cloth is provided with positioning holes at its four corners that cooperate with the positioning pins.

[0007] As a preferred embodiment of this utility model, the elastic retaining ring is made of polyurethane material, its cross-section is "Ω" shaped, and the inner side of the elastic retaining ring is filled with a rubber sealing ring.

[0008] As a preferred embodiment of this utility model, the height of the pusher boss is less than the thickness of the filter frame, and the height of the pusher boss gradually decreases from the outer edge toward the center.

[0009] As a preferred embodiment of this utility model, both the annular sealing boss and the annular sealing groove have trapezoidal cross-sections, wherein the annular sealing boss is disposed on the filter frame and the annular sealing groove is disposed on the filter plate.

[0010] As a preferred embodiment of this utility model, the expansion rate of the water-stopping strip is ≥200%, and the surface of the water-swellable water-stopping strip is coated with a food-grade silicone oil coating.

[0011] As a preferred embodiment of this utility model, the filter plate has a filter cavity inside, and the pusher boss is located inside the filter cavity; the filter plate has a feed hole in the middle position, and the filter plate has liquid outlet holes evenly distributed around its circumference; the filter cavity is connected to the feed hole and the liquid outlet holes; the feed hole and the liquid outlet holes are respectively connected to the feed pipe and the liquid outlet pipe provided on one side of the frame; and a filter screen is provided inside the liquid outlet hole.

[0012] As a preferred embodiment of this utility model, a pressure sensor is provided on the side surface of the pressing plate near the filter plate assembly. The pressure sensor is electrically connected to a control panel located on the outside of the frame. The control panel is signal connected to the pressing cylinder and the vibration motor.

[0013] The advantages of this utility model compared with the prior art are as follows:

[0014] 1. Improved reliability of filter cloth fixation: The filter cloth is secured by "Ω"-shaped polyurethane elastic retaining rings embedded in the annular grooves on both sides of the filter plate, and the positioning holes at the four corners of the filter cloth and the positioning pins of the filter plate provide a limiting effect, which effectively prevents the filter cloth from loosening or falling off due to pressure fluctuations or solution scouring, thus extending the filter cloth replacement cycle.

[0015] 2. Improved filter cake demolding efficiency: The vibration motor at the top of the filter frame can generate high-frequency vibration, which, combined with the pushing protrusions (the height of which is less than the thickness of the filter frame) that are inclined from the outside to the inside on the inner side wall of the filter plate, can work together to shake and push the filter cake away from the filter cloth and the surface of the filter frame, reducing manual intervention and improving production efficiency.

[0016] 3. Optimized sealing performance: The trapezoidal sealing bosses and grooves of the filter frame and filter plate are matched with water-swellable sealing strips (expansion rate ≥200%), which can fill the contact gaps after being compressed; the food-grade silicone oil coating on the surface of the sealing strip reduces frictional resistance and avoids chemical reaction with rock sugar solution, ensuring the sealing reliability of long-term use.

[0017] 4. Precise control of clamping force: The pressure sensor on the clamping plate monitors the clamping force of the filter plate assembly in real time, and adjusts the output of the clamping cylinder through the control panel to avoid leakage caused by insufficient clamping force or deformation of the filter plate caused by overload, thus extending the service life of the equipment. Attached Figure Description

[0018] Figure 1 This invention relates to the structure of a plate and frame filter for filtering rock sugar solution. Figure 1 .

[0019] Figure 2 This invention relates to the structure of a plate and frame filter for filtering rock sugar solution. Figure 2 .

[0020] Figure 3 This is a structural diagram of the filter plate assembly of a plate and frame filter for filtering rock sugar solution according to the present invention.

[0021] Figure 4 This is a structural diagram of the filter cloth fixing point of a plate and frame filter for filtering rock sugar solution according to this utility model.

[0022] Figure 5 This is a structural diagram of the filter plate of a plate and frame filter for filtering rock sugar solution according to the present invention.

[0023] As shown in the figure:

[0024] 1. Frame; 2. Clamping cylinder; 3. Clamping plate; 4. Filter plate; 5. Filter frame; 6. Annular groove; 7. Elastic retaining ring; 8. Filter cloth; 9. Vibration motor; 10. Pushing boss; 11. Annular sealing boss; 12. Annular sealing groove; 13. Water-stop rubber strip; 14. Positioning pin; 15. Positioning hole; 16. Rubber sealing ring; 17. Filter chamber; 18. Feed port; 19. Liquid outlet; 20. Feed pipe; 21. Liquid outlet pipe; 22. Pressure sensor; 23. Control panel. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] Example 1:

[0028] As per the instruction manual Figures 1-3 As shown, a plate and frame filter for filtering rock sugar solution includes a frame 1, a clamping cylinder 2, and a filter plate 4 assembly. The clamping cylinder 2 is located on one side of the frame 1, and the piston rod of the clamping cylinder 2 is connected to a clamping plate 3. The filter plate 4 assembly includes multiple parallel filter plates 4, with a filter frame 5 sandwiched between adjacent filter plates 4. A vibration motor 9 for assisting filter cake demolding is provided on the top of the filter frame 5. A feed hole 18 is provided in the middle of the filter plate 4, and liquid outlet holes 19 are evenly distributed around the circumference of the filter plate 4. The filter chamber 17 is connected to the feed hole 18 and the liquid outlet holes 19. The feed hole 18 and the liquid outlet holes 19 are respectively connected to the feed pipe 20 and the liquid outlet pipe 21 provided on one side of the frame 1. A pressure sensor 22 is provided on the surface of the clamping plate 3 near the filter plate 4 assembly. The pressure sensor 22 is electrically connected to a control panel 23 located on the outside of the frame 1. The control panel 23 is signal connected to the clamping cylinder 2 and the vibration motor 9.

[0029] As per the instruction manual Figures 3-4 As shown, an annular groove 6 is provided on the side of the filter plate 4 facing the filter frame 5. An elastic retaining ring 7 is embedded in the annular groove 6. The elastic retaining ring 7 is made of polyurethane material and has an "Ω" shaped cross-section. The inner side of the elastic retaining ring 7 is filled with a rubber sealing ring 16. The filter plate 4 is fixed with the filter cloth 8 through the cooperation of the annular groove 6 and the elastic retaining ring 7. Positioning pins 14 are provided at the four corners of the filter plate 4. Positioning holes 15 that cooperate with the positioning pins 14 are provided at the four corners of the filter cloth 8.

[0030] In this invention, a corresponding annular sealing boss 11 and an annular sealing groove 12 are provided between the contact surfaces of the filter frame 5 and the filter plate 4. The annular sealing groove 12 is filled with a water-swellable sealing strip 13. The cross-sections of the annular sealing boss 11 and the annular sealing groove 12 are both trapezoidal structures, wherein the annular sealing boss 11 is provided on the filter frame 5 and the annular sealing groove 12 is provided on the filter plate 4.

[0031] As per the instruction manual Figure 5As shown, a filter plate 4 has a filter cavity 17 inside. Pushing protrusions 10 are evenly distributed circumferentially in the filter cavity 17 on the inner side wall of the filter plate 4. The height of the pushing protrusions 10 is less than the thickness of the filter frame 5, and the height of the pushing protrusions 10 gradually decreases from the outer edge towards the center. This is used to reduce the adhesion strength of the filter cake and assist in the demolding of the filter cake. A feed hole 18 is provided in the middle position of the filter plate 4. Liquid outlet holes 19 are evenly distributed circumferentially in the filter plate 4. A filter screen is provided in the liquid outlet hole 19.

[0032] Working principle

[0033] 1. Assembly and pressing: Lay the filter cloth 8 on one side of the filter plate 4, align it with the positioning pin 14 and the positioning hole 15, and stack the filter plate 45 and the filter frame 5 in sequence to form the filter plate 4 assembly; start the pressing cylinder 2 to push the pressing plate 3 to one side until the filter plate 4 assembly is pressed (the pressure sensor 22 monitors the pressing force in real time, and the pressing cylinder 2 stops when the set value is reached).

[0034] 2. Filtration stage: The rock sugar solution to be filtered enters the feed hole 18 through the feed pipe 20 and then flows into the filter chamber 17 of the filter plate 4; the solution passes through the filter cloth 8 and enters the filter frame 5. Solid impurities (filter cake) are intercepted on the surface of the filter cloth 8, and the filtrate is filtered a second time through the filter screen of the outlet hole 19 and then output through the outlet pipe 21.

[0035] 3. Cake unloading and demolding: After filtration, the clamping cylinder 2 retracts in the opposite direction to loosen the clamping plate 3; the vibration motor 9 on the top of the filter frame 5 is started, and the filter cake, filter cloth 8 and filter frame 5 are loosened by high-frequency vibration; at the same time, the pusher protrusion 10 on the inner side wall of the filter plate 4 (inclined from the outside to the inside) reduces the adhesion strength of the filter cake, which can effectively assist in cleaning.

[0036] 4. Maintenance and reuse: After demolding, remove the old filter cloth 8 (if damaged), clean the filter plate 4 and filter frame 5 for any remaining impurities; replace or re-lay the filter cloth 8, repeat the above assembly and pressing steps, and proceed to the next round of filtration.

[0037] The present invention and its embodiments have been described above. This description is not restrictive, and the specific embodiments shown are only one of the embodiments of the present invention. The actual structure is not limited to this. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit of the present invention, such design should fall within the protection scope of the present invention.

Claims

1. A plate and frame filter for filtering rock sugar solution, comprising a frame (1), a clamping cylinder (2), and a filter plate (4) assembly, wherein the clamping cylinder (2) is located on one side of the frame (1), and the piston rod of the clamping cylinder (2) is connected to a clamping plate (3), and the filter plate (4) assembly comprises a plurality of parallel filter plates (4), with a filter frame (5) clamped between adjacent filter plates (4), characterized in that: The filter plate (4) has an annular groove (6) on the side facing the filter frame (5), and an elastic retaining ring (7) is embedded in the annular groove (6). The filter plate (4) is fixed with filter cloth (8) through the cooperation of the annular groove (6) and the elastic retaining ring (7). The top of the filter frame (5) is provided with a vibration motor (9) to assist in the demolding of the filter cake, and the inner sidewall of the filter plate (4) is provided with pusher bosses (10) evenly distributed in the circumference to assist in the demolding of the filter cake. The filter frame (5) and the filter plate (4) are provided with corresponding annular sealing boss (11) and annular sealing groove (12), and the annular sealing groove (12) is filled with a water-swellable sealing strip (13).

2. The plate and frame filter for filtering rock sugar solution according to claim 1, characterized in that: The filter plate (4) is provided with positioning pins (14) at the four corners, and the filter cloth (8) is provided with positioning holes (15) at the four corners to cooperate with the positioning pins (14).

3. The plate and frame filter for filtering rock sugar solution according to claim 1, characterized in that: The elastic retaining ring (7) is made of polyurethane material, and its cross-section is "Ω" shaped. The inner side of the elastic retaining ring (7) is filled with a rubber sealing ring (16).

4. A plate and frame filter for filtering rock sugar solution according to claim 1, characterized in that: The height of the pusher boss (10) is less than the thickness of the filter frame (5), and the height of the pusher boss (10) gradually decreases from the outer edge toward the center.

5. A plate and frame filter for filtering rock sugar solution according to claim 1, characterized in that: The cross-sections of the annular sealing boss (11) and the annular sealing groove (12) are both trapezoidal structures. The annular sealing boss (11) is set on the filter frame (5), and the annular sealing groove (12) is set on the filter plate (4).

6. A plate and frame filter for filtering rock sugar solution according to claim 1, characterized in that: The expansion rate of the water-swellable sealing strip (13) is ≥200%, and the surface of the water-swellable sealing strip (13) is coated with a food-grade silicone oil coating.

7. A plate and frame filter for filtering rock sugar solution according to claim 1, characterized in that: The filter plate (4) has a filter chamber (17) inside, and the pusher boss (10) is located inside the filter chamber (17). The filter plate (4) has a feed hole (18) in the middle position, and the filter plate (4) has liquid outlet holes (19) evenly distributed around its circumference. The filter chamber (17) is connected to the feed hole (18) and the liquid outlet hole (19). The feed hole (18) and the liquid outlet hole (19) are connected to the feed pipe (20) and the liquid outlet pipe (21) respectively provided on one side of the frame (1). The liquid outlet hole (19) is provided with a filter screen.

8. A plate and frame filter for filtering rock sugar solution according to claim 1, characterized in that: A pressure sensor (22) is provided on the side surface of the clamping plate (3) near the filter plate (4) assembly. The pressure sensor (22) is electrically connected to the control panel (23) located on the outside of the frame (1). The control panel (23) is signal connected to the clamping cylinder (2) and the vibration motor (9).

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