A composite plate and frame filter

Abstract

The present application relates to filter technical field, specifically to a kind of composite plate and frame filter, including rack and filter frame, filter frame includes multiple filter plates, adjacent filter plate can form closed filter chamber, composite plate and frame filter further includes filter cloth winding mechanism, filter cloth winding mechanism includes filter cloth, pay-off roll, receiving roll and multiple reversing roller, filter cloth is wound on pay-off roll, filter cloth is in succession wound around filter plate and reversing roller in "Z" letter route, and one end of filter cloth is wound on receiving roll, the center of each filter plate is provided with center hole, and filter cloth is respectively detachably connected with buckling sleeve on the two sides of each filter plate, after each filter plate is extruded together, each buckling sleeve is respectively inserted in corresponding center hole and is connected to form filtrate channel, and filtrate channel is used to pass into the filtrate to be filtered into each filter chamber.The present application solves the technical problems of the prior art, such as complicated replacement steps and low replacement efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of filters, and in particular to a composite plate-frame filter. Background Art

[0002] A plate-and-frame filter is a solid-liquid separation device for suspensions and can be used in the automotive manufacturing field for filtering liquids. The plate-and-frame filter mainly includes a frame, a filter pump, a liquid inlet pipe, a liquid outlet pipe, and a filter frame mounted on the frame. The filter frame includes multiple filter plates arranged side by side, and multiple filter plate guides are movably mounted on the frame. The frame is also provided with a hydraulic push rod, which is used to push the filter plates so that the multiple filter plates are superimposed and squeezed against each other. When the filter plates are stacked together, a closed filter chamber is formed between the adjacent filter plates. Filter cloths are provided on opposite sides of each filter plate. During operation, the filtrate enters the filter chamber between each two adjacent filter plates through the liquid inlet pipe in sequence, then passes through the filter cloth and is discharged from the liquid outlet pipe. The filter residue remains in the filter chamber to form a filter cake, thereby achieving the purpose of solid-liquid separation.

[0003] In the plate-and-frame filter of the prior art, the filter cloths on both sides of the filter plate need to be installed one by one, and the assembly steps are cumbersome. When the filter cloths need to be replaced, the filter cloths need to be removed from the filter plate one by one, and then replaced with new ones one by one, which has a low replacement efficiency. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the present invention proposes a composite plate-and-frame filter to solve the technical problems of the prior art plate-and-frame filter having complicated filter plate replacement steps and low replacement efficiency.

[0005] A composite plate-and-frame filter of the present invention adopts the following technical solution:

[0006] 14. The filter press of claim 13, wherein the filter press comprises a filter element and a filter element and wherein the filter element is adapted to pass through the filter element and the filter element is, for example, guided by a filter element of the filter press.

[0007] Furthermore, the snap-fit ​​sleeve includes a first sleeve body and a second sleeve body, the filter cloth is provided with through-holes corresponding to the snap-fit ​​sleeves one by one, one end of the second sleeve body passes through the corresponding through-holes and is coaxially inserted into the first sleeve body, the first sleeve body is provided with a first outward-turned edge extending radially outwardly thereof, and the second sleeve body is provided with a second outward-turned edge extending radially outwardly thereof, when the second sleeve body is inserted into the first sleeve body, the first outward-turned edge and the second outward-turned edge clamp the filter cloth.

[0008] Furthermore, the two snap-fit ​​sleeves on opposite sides of each filter plate are arranged symmetrically back to back, and the two snap-fit ​​sleeves between two adjacent filter plates are arranged symmetrically face to face. The liquid inlet is opened on the outer periphery of the second sleeve body, and the liquid inlet is located on the side of the second outward-turned edge away from the first outward-turned edge.

[0009] Furthermore, the frame is provided with a first slide rail and a second slide rail, the first slide rail and the second slide rail are arranged parallel and spaced apart from each other, the second slide rail is located above the first slide rail, the filter plate is movably mounted on the first slide rail, and the reversing roller is movably mounted on the second slide rail.

[0010] Furthermore, it is set that multiple filter plates are arranged side by side in the left-right direction, the axis of the reversing roller extends in the front-back direction, the first slide rail and the second slide rail extend in the left-right direction, two first slide rails are arranged at intervals in the front and back, and two second slide rails are arranged at intervals in the front and back. Support arms are fixed on the front and back sides of the filter plate respectively, and support rollers are rotatably installed on the support arms. The support rollers are supported on the first slide rail, and the filter plate is movably installed on the first slide rail through the support rollers.

[0011] Furthermore, the second slide rails on the front and rear sides are respectively provided with long guide holes extending in the left and right directions, and the front and rear ends of the reversing roller respectively extend into the long guide holes on the corresponding sides. The reversing roller can rotate around its own axis and can move left and right along the extension direction of the long guide hole.

[0012] Furthermore, the filter frame further comprises a fixing plate and a pressing plate, which are respectively located at two ends of the filter frame, the fixing plate is fixedly connected to the frame, and the pressing plate is movably mounted on the first slide rail.

[0013] Furthermore, a telescopic push rod is installed on the frame, one end of the telescopic push rod is connected to the pressure plate, and the telescopic push rod pushes the pressure plate when it is extended, so that the filter plates are squeezed against each other.

[0014] Furthermore, a water pipe is provided on the frame, and the water pipe includes a liquid inlet pipe and a liquid outlet pipe. A liquid inlet hole is opened in the center of the fixed plate. One end of the liquid inlet pipe is connected to the fixed plate and communicates with the filtrate channel through the liquid inlet hole.

[0015] Furthermore, the central hole on each filter plate is a stepped hole, and one end of the first sleeve extending into the central hole is provided with a guiding cone surface.

[0016] The beneficial effects of the present invention are as follows: a composite plate and frame filter of the present invention is provided with a filter cloth winding mechanism, and a snap-fit ​​sleeve is detachably connected to the filter cloth. When the filter plates are squeezed against each other, a filtrate channel is formed by the snap-fit ​​sleeve to allow the filtrate to flow into each filter chamber. When the filter cloth needs to be replaced, the snap-fit ​​sleeve is removed, and the receiving roller and the discharge roller are rotated at the same time, so that the used filter cloth is wound on the receiving roller, and at the same time, the new filter cloth on the discharge roller is replaced to the position of each filter plate, which can improve the replacement efficiency of the filter cloth.

[0017] Furthermore, the present invention utilizes the arrangement of the filter cloth and the reversing roller in the filter cloth winding mechanism to facilitate the filter cake between the filter cloths to fall from the filter chamber when the filter plates are separated from each other, thereby facilitating unloading, avoiding the filter cake from adhering to the filter cloth, and improving unloading efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work. Those skilled in the art should understand that these drawings are not necessarily drawn to scale.

[0019] Figure 1 This is a three-dimensional schematic diagram of an embodiment of a composite plate-and-frame filter of the present invention;

[0020] Figure 2 This is a front view of an embodiment of a composite plate-and-frame filter according to the present invention;

[0021] Figure 3 for Figure 2 AA-direction sectional stereogram;

[0022] Figure 4 This is a transverse cross-sectional schematic diagram of an embodiment of a composite plate and frame filter of the present invention;

[0023] Figure 5 for Figure 4 A magnified schematic diagram of the local X in the middle;

[0024] Figure 6 for Figure 5 A magnified schematic diagram of the local Y in the middle;

[0025] Figure 7 for Figure 5 A magnified schematic diagram of the local Z in the middle;

[0026] Figure 8 This is a schematic transverse cross-sectional view of a filter plate in one embodiment of a composite plate-and-frame filter of the present invention;

[0027] Figure 9 This is a three-dimensional schematic diagram of a first set of bodies in an embodiment of a composite plate-and-frame filter of the present invention;

[0028] Figure 10 This is a three-dimensional schematic diagram of a snap-fit ​​sleeve in one embodiment of a composite plate-and-frame filter of the present invention;

[0029] Figure 11 This is a three-dimensional schematic diagram from another angle of a snap-fit ​​sleeve in one embodiment of a composite plate-and-frame filter of the present invention;

[0030] In the figure: 101, frame; 102, control console; 103, telescopic push rod; 104, pressure plate; 105, pallet trolley; 106, collection box; 107, water pipe; 200, filter frame; 201, filter plate; 2011, center hole; 2012, water filter channel; 2013, fillet; 202, filter cloth; 203, reversing roller; 2031, second slide rail; 204, unloading roller; 205, receiving roller; 210, snap-fit ​​sleeve; 211, first sleeve; 2111, guide cone; 212, second sleeve; 2121, liquid inlet; 2122, abutment edge. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like, indicating positions or relationships, are based on those shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the device or element referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention.

[0033] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0034] An embodiment of a composite plate-and-frame filter according to the present invention is as follows: Figures 1 to 11 As shown, the composite plate-and-frame filter can be applied to the automotive manufacturing field for filtering liquids. The composite plate-and-frame filter includes a frame 101, a filter frame 200, a water pipe 107, a water pump, and a telescopic push mechanism. The filter frame 200 includes a fixed plate, a pressure plate 104, and a plurality of filter plates 201. The plurality of filter plates 201 are arranged side by side in the left-right direction. The fixed plate and the pressure plate 104 are respectively located at the left and right ends of the filter frame 200. The fixed plate is fixedly connected to the frame 101, and the pressure plate 104 is movably arranged on the frame 101. Each filter plate 201 is movably arranged on the frame 101, and each filter plate 201 can be guided and moved in the left-right direction. The telescopic pushing mechanism includes a telescopic pushing rod 103, which is a hydraulic cylinder. One end of the telescopic pushing rod 103 is connected to a pressure plate 104. The extension of the telescopic pushing rod 103 drives the pressure plate 104 toward the fixed plate, causing the filter plates 201 to approach and squeeze each other. When the filter plates 201 approach and squeeze each other, adjacent filter plates 201 can form a sealed filter chamber. Filtrate to be filtered is introduced into each filter chamber through a water pipe 107. Impurities in the filtrate are trapped in the filter chamber to form a filter cake. Filtered water in the filtrate is then discharged through the water pipe 107. It should be noted that the connection between the water pipe 107 and the filter frame 200, as well as the water inlet and outlet, are all known structures. The telescopic pushing rod 103 is also a known structure and will not be described in detail here.

[0035] In the present invention, the composite plate and frame filter further includes a filter cloth winding mechanism, which includes a filter cloth 202, a discharge roller 204, a take-up roller 205, and a plurality of reversing rollers 203. The axes of the reversing rollers 203 extend in the front-to-back direction, and a reversing roller 203 is provided between each adjacent filter plate 201. The discharge rollers 204 and the take-up rollers 205 are respectively arranged on the left and right sides of the filter frame 200, and are both located below the filter frame 200. The filter cloth 202 is wound around the discharge rollers 204, and the filter cloth 202 is sequentially passed around the filter plates 201 and the reversing rollers 203 in a zigzag pattern, with one end of the filter cloth 202 being wound around the take-up roller 205. When the filter cloth 202 needs to be replaced, the receiving roller 205 and the discharging roller 204 rotate simultaneously, so that the used filter cloth 202 is wound on the receiving roller 205, and at the same time, the new filter cloth 202 on the discharging roller 204 is replaced at the position of each filter plate 201, thereby improving the replacement efficiency of the filter cloth 202. In this embodiment, to reduce the wear between the filter plate 201 and the filter cloth 202, the outer periphery of the filter plate 201 is provided with a rounded corner 2013. In this way, one side of the filter cloth 202 slides and supports with the side of the filter plate 201, and the filter cloth 202 is not damaged.

[0036] In the present invention, a central hole 2011 is opened in the center of each filter plate 201, and the filter cloth 202 is detachably connected to the snap-fit ​​sleeves 210 on the opposite sides of each filter plate 201. After the filter plates 201 are squeezed together, the snap-fit ​​sleeves 210 are respectively inserted into the corresponding central holes 2011 from the opposite sides of each filter plate 201, and docked to form a filtrate channel. The water pipe 107 passes the filtrate to be filtered into each filter chamber through the filtrate channel. A liquid inlet 2121 connected to the filter chamber is provided on the outer periphery of each snap-fit ​​sleeve 210, and each filter plate 201 is also provided with a water filter channel 2012 connected to the filter chamber. The water filter channel 2012 is used to discharge filtered water. In this embodiment, each filter plate 201 is provided with a connecting hole on the periphery of the center hole 2011, and the water filter channel 2012 is connected to the filter chamber through the connecting hole, so that the water in the filtrate in the filter chamber can be discharged outward through the connecting hole. In addition, cleaning liquid can be reversely injected into the filter chamber through the water filter channel 2012 and the connecting hole, so that the filter cake in the filter chamber can be cleaned.

[0037] In this embodiment, each snap-fit ​​sleeve 210 includes a first sleeve 211 and a second sleeve 212. The filter cloth 202 is provided with through-holes corresponding to the snap-fit ​​sleeves 210 one by one. One end of the second sleeve 212 passes through the corresponding through-holes and is coaxially inserted into the first sleeve 211. The first sleeve 211 is provided with a first outward-turned edge extending radially outward, and the second sleeve 212 is provided with a second outward-turned edge extending radially outward. When the second sleeve 212 is inserted into the first sleeve 211, the first outward-turned edge and the second outward-turned edge clamp the filter cloth 202 so that each snap-fit ​​sleeve 210 can be detachably connected to the filter cloth 202.

[0038] In this embodiment, the two snap-fit ​​sleeves 210 on opposite sides of each filter plate 201 are arranged symmetrically back-to-back, and the two snap-fit ​​sleeves 210 between two adjacent filter plates 201 are arranged symmetrically face-to-face. When the telescopic push rod 103 is extended, causing the filter plates 201 to press against each other, the two snap-fit ​​sleeves 210 on opposite sides of each filter plate 201 are respectively inserted into the center hole 2011 from both sides of the filter plate 201. The two snap-fit ​​sleeves 210 between two adjacent filter plates 201 have abutment edges 2122 at opposite ends, and the abutment edges 2122 of the two snap-fit ​​sleeves 210 between two adjacent filter plates 201 abut against each other. In this embodiment, to facilitate the insertion of the snap-fit ​​sleeves 210 into the center hole 2011 and to locate the position where the snap-fit ​​sleeves 210 extend into the center hole 2011, the center hole 2011 of each filter plate 201 is a stepped hole, and the end of the first sleeve 211 extending into the center hole 2011 is provided with a guiding conical surface 2111.

[0039] In this embodiment, the liquid inlet 2121 is opened on the outer periphery of the second housing 212, and the liquid inlet 2121 is located on the side of the second outer edge away from the first outer edge. Figure 5 and Figure 6 As can be seen in the figure, when the filtrate enters the filter chamber between two adjacent filter plates 201 from the snap-fit ​​sleeve 210 through the liquid inlet 2121, the filtrate in the filter chamber is located between the filter cloths 202 on both sides, so that the impurities in the filtrate will be intercepted by the filter cloths 202 on both sides in the filter chamber, and the filter cake in each filter chamber is formed between the filter cloths 202 on both sides. When the filter plates 201 are moved away from each other in sequence, as shown in FIG. Figure 5 and Figure 7 As shown, at this time, the filter cloth 202 and the snap-fit ​​sleeve 210 will be separated from each filter plate 201 in sequence, which is conducive to the filter cake between the filter cloth 202 falling and convenient for material dropping.

[0040] In this embodiment, the frame 101 is provided with a first slide rail and a second slide rail 2031. The first and second slide rails 2031 are arranged parallel to each other in an upper and lower direction, and the second slide rail 2031 is located above the first slide rail. The first and second slide rails 2031 both extend in the left-right direction, with two first slide rails spaced apart in the front-to-back direction, and two second slide rails 2031 spaced apart in the front-to-back direction. The filter plate 201 and the pressure plate 104 are movably mounted on the first slide rail, and the reversing roller 203 is movably mounted on the second slide rail 2031. Specifically, support arms are fixed to the front and rear sides of the filter plate 201 and the pressure plate 104, and support rollers are rotatably mounted on the support arms. The support rollers are supported on the first slide rail, and the filter plate 201 and the pressure plate 104 are movably mounted on the first slide rail via the support rollers. The second slide rails 2031 on the front and rear sides are respectively provided with long guide holes extending in the left and right directions. The front and rear ends of the reversing roller 203 are respectively extended into the long guide holes on the corresponding sides. The reversing roller 203 can rotate around its own axis and can move left and right along the extension direction of the long guide hole.

[0041] In this embodiment, a water pipe 107 is provided on the frame 101, and the water pipe 107 includes a liquid inlet pipe and a liquid outlet pipe. A liquid inlet hole is opened in the center of the fixed plate, one end of the liquid inlet pipe is connected to the fixed plate, and the liquid inlet pipe is connected to the filtrate channel through the liquid inlet hole.

[0042] In this embodiment, a pallet trolley 105 is provided on the first slide rail. The pallet trolley 105 is an existing structure and will not be described in detail here. When the filter frame 200 is unloading, the telescopic push rod 103 contracts and drives the pressure plate 104 away from the filter plate 201. The pallet trolley 105 then moves along the first slide rail and sequentially transports each filter plate 201, thereby separating each filter plate 201 in sequence and unloading the filter cake from each filter chamber. In this embodiment, a drop hopper is provided on the frame 101 below the filter frame 200. A collection box 106 is provided below the drop hopper. The filter cake dropped from the filter chamber is collected in the collection box 106 through the drop hopper.

[0043] In this embodiment, a control console 102 is provided on the frame 101 on one side of the telescopic push rod 103 , and the control console 102 is used to control the start and stop of the composite plate and frame filter, and to control the extension and retraction of the telescopic push rod 103 and the movement of the pallet trolley 105 .

[0044] When the composite plate-and-frame filter of the present invention is in use, in the initial state, the filter plates 201 are separated from each other. The filter cloths 202 are routed in a zigzag pattern around the lower ends of the filter plates 201 and the reversing rollers 203. The filter cloths 202 and the opposite sides of the filter plates 201 are not in contact with each other, and each snap-fit ​​sleeve 210 is not inserted into the central hole 2011 of the filter plates 201. When filtering the filtrate, the control console 102 controls the extension of the telescopic push rods 103, causing them to move the pressing plate 104 toward the fixed plate, squeezing the filter plates 201 together. This creates a closed filter chamber between two adjacent filter plates 201, with the filter cloths 202 between the two adjacent filter plates 201 enclosed within the filter chamber. Simultaneously, the snap-fit ​​sleeves 210 on the filter cloth 202 are inserted into the central holes 2011 of each filter plate 201, forming a filtrate channel extending in the left-right direction. This filtrate channel communicates with each filter chamber through a liquid inlet 2121 on the outer periphery of each snap-fit ​​sleeve 210. It should be noted that when the telescopic push rod 103 extends, the receiving roller 205 adjacent to the telescopic push rod 103 rotates synchronously, releasing a certain length of filter cloth 202 to prevent the filter cloth 202 from being pulled by the pressing plate 104 and the receiving roller 205. Furthermore, supported by the two snap-fit ​​sleeves 210, the filter cloth 202 in each filter chamber is separated by a gap, within which the filter cake forms.

[0045] The filtrate to be filtered is then input into the filtrate channel through the liquid inlet pipe and enters each filter chamber from the liquid inlet 2121 on each snap-fit ​​sleeve 210. The filter cloths 202 on both sides between the two adjacent filter plates 201 respectively intercept the debris in the filter chamber, and the filtered water is discharged outward through the water filtration channel 2012 and the liquid outlet pipe, thereby forming a filter cake between the filter cloths 202 on both sides. When unloading is required, the telescopic push rod 103 retracts, driving the pressure plate 104 away from the fixed plate. At the same time, the receiving roller 205 rotates synchronously and rewinds the filter cloth 202. The pallet trolley 105 is then activated to sequentially transport each filter plate 201 to a state of separation. After each adjacent filter plate 201 separates from each other, the snap-fit ​​sleeves 210 on the filter cloth 202 separate from the two filter plates 201. The filter cloth 202 between the two filter plates 201 forms an inverted V shape, which facilitates the filter cake between the filter cloths 202 on both sides to fall from between the filter cloths 202, preventing the filter cake from sticking to the filter cloth 202 and facilitating unloading. After the filter cake falls from between the two filter plates 201, it enters the collection box 106 below through the drop hopper.

[0046] When the filter cloth 202 between each filter plate 201 needs to be replaced after being used for a period of time, the filter plates 201 are separated from each other, and then the snap-fit ​​sleeves 210 on the filter cloth 202 are removed in turn. Then, the receiving roller 205 and the discharge roller 204 are rotated to rewind the used filter cloth 202 on the receiving roller 205, and the new filter cloth 202 on the discharge roller 204 reaches between each filter plate 201. Then, each snap-fit ​​sleeve 210 is installed on the filter cloth 202 to start a new filtering operation.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A composite plate-and-frame filter, comprising a frame and a filter frame, wherein the filter frame comprises a plurality of filter plates, and adjacent filter plates can enclose a closed filter chamber, characterized in that: The composite plate and frame filter also includes a filter cloth winding mechanism, which includes a filter cloth, a feeding roller, a receiving roller and a plurality of reversing rollers. A reversing roller is provided between each two adjacent filter plates. The filter cloth is wound on the feeding roller, and the filter cloth passes around the filter plates and the reversing roller in a "Z"-shaped route in sequence, and one end of the filter cloth is wound on the receiving roller. A center hole is provided in the center of each filter plate, and snap-fit ​​sleeves are detachably connected to the filter cloth on opposite sides of each filter plate. After the filter plates are squeezed together, the snap-fit ​​sleeves are respectively inserted into the corresponding center holes and docked to form a filtrate channel. The filtrate channel is used to pass the filtrate to be filtered into each filter chamber. A liquid inlet connected to the filter chamber is provided on the outer periphery of each snap-fit ​​sleeve. A water filter channel connected to the filter chamber is also provided on each filter plate, and the water filter channel is used to discharge filtered water. The snap-fit ​​sleeve includes a first sleeve body and a second sleeve body. The filter cloth is provided with perforations corresponding to the snap-fit ​​sleeves one by one. One end of the second sleeve body passes through the corresponding perforations and is coaxially inserted into the first sleeve body. The first sleeve body is provided with a first outward-turned edge extending radially outward from the first sleeve body, and the second sleeve body is provided with a second outward-turned edge extending radially outward from the first sleeve body. When the second sleeve body is inserted into the first sleeve body, the first outward-turned edge and the second outward-turned edge clamp the filter cloth. The two snap-fit ​​sleeves on opposite sides of each filter plate are arranged symmetrically back to back, and the two snap-fit ​​sleeves between two adjacent filter plates are arranged symmetrically face to face. The liquid inlet is opened on the outer periphery of the second sleeve body, and the liquid inlet is located on the side of the second outward-turned edge away from the first outward-turned edge. The two snap-fit ​​sleeves between two adjacent filter plates have abutting edges at opposite ends, and the abutting edges of the two snap-fit ​​sleeves between two adjacent filter plates are in contact with each other. The central hole on each filter plate is a stepped hole, and one end of the first sleeve extending into the central hole is provided with a guiding cone surface.

2. The composite plate-and-frame filter according to claim 1, characterized in that: The frame is provided with a first slide rail and a second slide rail, which are arranged in parallel and spaced apart. The second slide rail is located above the first slide rail. The filter plate is movably mounted on the first slide rail, and the reversing roller is movably mounted on the second slide rail.

3. The composite plate-and-frame filter according to claim 2, characterized in that: It is set that multiple filter plates are arranged side by side in the left and right directions, the axis of the reversing roller extends in the front and back directions, the first slide rail and the second slide rail extend in the left and right directions, two first slide rails are arranged at intervals in the front and back, and two second slide rails are arranged at intervals in the front and back. Support arms are fixed on the front and back sides of the filter plate respectively, and support rollers are rotatably installed on the support arms. The support rollers are supported on the first slide rails, and the filter plate is movably installed on the first slide rails through the support rollers.

4. The composite plate-and-frame filter according to claim 3, characterized in that: The second slide rails on the front and rear sides are respectively provided with long guide holes extending in the left and right directions. The front and rear ends of the reversing roller respectively extend into the long guide holes on the corresponding sides. The reversing roller can rotate around its own axis and can move left and right along the extension direction of the long guide holes.

5. The composite plate-and-frame filter according to claim 4, characterized in that: The filter frame also includes a fixed plate and a pressing plate, which are respectively located at the left and right ends of the filter frame. The fixed plate is fixedly connected to the frame, and the pressing plate is movably installed on the first slide rail.

6. The composite plate-and-frame filter according to claim 5, characterized in that: A telescopic push rod is installed on the frame, one end of which is connected to the pressure plate. When the telescopic push rod is extended, it pushes the pressure plate to squeeze the filter plates against each other.

7. The composite plate-and-frame filter according to claim 6, characterized in that: The frame is provided with a water pipe, which includes a liquid inlet pipe and a liquid outlet pipe. A liquid inlet hole is opened in the center of the fixed plate. One end of the liquid inlet pipe is connected to the fixed plate and communicates with the filtrate channel through the liquid inlet hole.

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