Diaphragm filter pressing plate for filter press

Abstract

The utility model relates to the technical field of filter pressing plates, in particular to a diaphragm filter pressing plate for a filter press, which comprises a diaphragm pressing plate, a squeezing diaphragm, a mold core plate, a filter cloth pressing plate, filter cloth, an elastic ring piece and a limiting component, the film pressing plate and the filter cloth pressing plate are sequentially mounted on the periphery of the mold core plate from inside to outside, and the pressing film is clamped between the film pressing plate and the mold core plate; an annular groove is jointly formed in the bottoms of the inner sides of the film pressing plate and the filter cloth pressing plate, and two limiting grooves are symmetrically formed in the bottom of the inner side of the filter cloth pressing plate; the outer side end of the filter cloth is arranged in the annular groove, and the limiting assembly is arranged in the limiting groove; the elastic ring piece comprises two semicircular elastic arc-shaped pieces, and the two elastic arc-shaped pieces are spliced with each other, arranged in the annular groove and pressed above the filter cloth; the head ends and the tail ends of the two elastic arc-shaped pieces abut against the two side faces of the two limiting assemblies respectively, and the limiting assemblies are used for limiting movement of the elastic arc-shaped pieces. The membrane filter pressing plate solves the technical problem that the traditional membrane filter pressing plate has hidden dangers in installation of the filter cloth and the squeezing membrane.

Description

TECHNICAL FIELD

[0001] The utility model relates to filter press technology field especially filter press's diaphragm filter plate. BACKGROUND

[0002] In the industrial production process, solid-liquid separation is a vital link. In order to achieve this goal, filter press as a kind of efficient solid-liquid separation equipment is widely used in various fields, such as chemical industry, pharmacy, food, environmental protection etc. The working principle of filter press is mainly to use pressure difference, through filter medium (such as filter cloth) to separate solid particles and liquid. And in filter press, diaphragm filter plate as one of its core components, plays a pivotal role.

[0003] Traditional diaphragm filter plate design often has some shortcomings. For example, filter cloth is prone to displacement or falling off in the squeezing process, resulting in liquid leakage, affecting the filtration efficiency, at the same time, the contact between squeezing membrane and filter cloth is not close enough, so that the squeezing effect is not ideal, it is difficult to completely squeeze out the excess liquid in filter cake. These problems not only reduce the working efficiency of filter press, but also increase the operation difficulty and maintenance cost. UTILITY MODEL CONTENTS

[0004] The utility model is provided with a kind of diaphragm filter plate for filter press, to solve the technical problems that traditional diaphragm filter plate has filter cloth and squeezing membrane installation hidden danger.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A kind of diaphragm filter plate for filter press, including press membrane plate, squeezing membrane, mold core plate, filter cloth press plate, filter cloth, elastic ring piece and limiting component;

[0007] The press membrane plate and the filter cloth press plate are annular structure, the press membrane plate and the filter cloth press plate are sequentially installed from inside to outside on the outer periphery of the mold core plate, the press membrane plate and mold core plate are clamped with the squeezing membrane;

[0008] The inner side bottom of the press membrane plate and the filter cloth press plate is commonly provided with annular groove, and the inner side bottom of the filter cloth press plate is symmetrically provided with two limiting grooves;

[0009] The outer side end of the filter cloth is arranged in the annular groove, and the limiting component is arranged in the limiting groove;

[0010] The elastic ring piece includes two elastic arc-shaped pieces, the elastic arc-shaped piece is semicircular, and the two elastic arc-shaped pieces are arranged in the annular groove and pressed above the filter cloth;

[0011] Two ends of the elastic arc-shaped members are respectively pressed against two sides of two limiting assemblies for limiting movement of the elastic arc-shaped members.

[0012] Preferably, the inner annular surface of the filter cloth pressing plate is provided with an annular half groove.

[0013] The inner annular surface of the filter cloth pressing plate is inwardly extended to form an annular boss, and the annular boss is provided with a continuous annular half groove and an annular groove on one side close to the filter cloth pressing plate.

[0014] When the filter cloth pressing plate and the filter plate are installed in close contact, the two annular half grooves are close to each other to form the annular groove.

[0015] The outer periphery of the filter cloth is curled to form a filter cloth protruding portion.

[0016] The elastic ring member is pressed above the filter cloth, and the filter cloth protruding portion is embedded in the annular groove along the annular groove.

[0017] Preferably, the filter plate is provided with a mounting threaded groove corresponding to the limiting groove.

[0018] The limiting assembly comprises a limiting member and a limiting block.

[0019] The center of the limiting block is provided with a limiting threaded through hole, and one side of the limiting block close to the inner annular surface of the filter cloth pressing plate is provided with a limiting groove, and a limiting protrusion is formed beside the limiting groove.

[0020] When the limiting block is installed in the limiting groove, the limiting groove is in communication with the annular half groove of the filter cloth pressing plate, the limiting protrusion is protrudingly arranged in the annular half groove of the filter cloth pressing plate, the limiting groove and the annular half groove are both used for embedding the filter cloth protruding portion, and two sides of the limiting protrusion are used for abutting two ends of the elastic arc-shaped members.

[0021] The limiting member is sequentially threaded through the limiting threaded through hole and the upper limiting groove, and is threadedly connected with the limiting threaded through hole and the upper limiting groove.

[0022] Preferably, the filter plate, the filter plate, the mold core plate, and the filter cloth pressing plate are fixedly connected through a fixing assembly.

[0023] The filter cloth pressing plate is provided with a plurality of first threaded through holes spaced apart along the circumferential direction thereof.

[0024] The filter plate is provided with a plurality of second threaded through holes spaced apart along the circumferential direction thereof.

[0025] The outer periphery of the filter plate is provided with a plurality of third threaded through holes spaced apart along the circumferential direction thereof.

[0026] A plurality of upper thread grooves are formed on the outer periphery of the upper surface of the mold core plate along the circumferential direction thereof;

[0027] The first, second and third threaded through holes have a larger diameter than the upper thread grooves;

[0028] The fixing assembly comprises a fixing member and a fixing sleeve;

[0029] The fixing sleeve is embedded in the first, second and / or third threaded through holes, and the fixing member is threadedly connected with the upper thread grooves through the fixing sleeve.

[0030] Preferably, the fixing member comprises a fixing cap and a threaded rod, and the fixing cap is connected to the top end of the threaded rod;

[0031] The fixing sleeve is a fixing gasket, and the thickness of the fixing gasket is the same as the thickness of the pressing membrane and the depth of the third threaded through hole, and the fixing gasket is embedded in the third threaded through hole;

[0032] The inner wall of the first threaded through hole is provided with a fixing boss, and the fixing boss is located on the side of the first threaded through hole close to the pressing plate, the threaded rod is movably inserted into the fixing boss, and the fixing cap is located above the fixing boss.

[0033] Preferably, the fixing member comprises a fixing cap and a threaded rod, and the fixing cap is connected to the top end of the threaded rod;

[0034] The fixing sleeve comprises a fixing gasket and a fixing sleeve, the fixing gasket is connected to the top end of the fixing sleeve, and the fixing gasket and the fixing sleeve are provided with a through fixing threaded through hole;

[0035] The inner wall of the first threaded through hole is provided with a fixing boss, and the fixing boss is located on the side of the first threaded through hole close to the pressing plate;

[0036] The threaded rod is movably inserted into the fixing gasket and the fixing sleeve, and the fixing gasket is located above the fixing boss, and the fixing cap is located above the fixing gasket.

[0037] Preferably, the upper surface of the mold core plate is provided with a mounting ring groove;

[0038] The outer periphery of the pressing membrane is curled to form a membrane protruding portion;

[0039] The membrane protruding portion is embedded in the mounting ring groove.

[0040] One of the above technical solutions has the following beneficial effects:

[0041] 1. Enhance the stability of filter cloth fixing: the filter cloth is embedded and installed in the annular groove through the elastic ring piece, and is limited to move by the limiting assembly, ensure the stability and sealing performance of the filter cloth in the filter pressing process, prevent the filter cloth from loosening or falling off.

[0042] 2. Improve the pressing effect: through the pressing effect of the elastic ring piece on the filter cloth, the contact between the pressing membrane and the filter cloth is more closely, so as to improve the pressing effect. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 is a structure diagram of the diaphragm filter plate of the filter press;

[0044] Figure 2 is a schematic view of the diaphragm filter plate of the filter press from the top;

[0045] Figure 3 is Figure 2 the cross-sectional view of A-A in figure;

[0046] Figure 4 is Figure 3 the cross-sectional view of C in figure;

[0047] Figure 5 is Figure 2 the cross-sectional view of B-B in figure;

[0048] Figure 6 is Figure 5 the cross-sectional view of the first embodiment of D;

[0049] Figure 7 is Figure 5 the cross-sectional view of the second embodiment of D;

[0050] In the drawings: the membrane plate 1, the second threaded through hole 11, the installation threaded groove 12, the installation ring groove 13;

[0051] The pressing membrane 2, the third threaded through hole 21, the membrane convex part 22;

[0052] The mold core plate 3, the upper threaded groove 31;

[0053] The filter cloth pressing plate 4, the first threaded through hole 41, the fixed boss 42, the annular groove 43;

[0054] The filter cloth 5, the filter cloth convex part 51;

[0055] The fixing assembly 6, the fixing piece 61, the fixing cap 611, the threaded rod 612, the fixing sleeve 62, the fixing gasket 621, the fixing sleeve 622;

[0056] The elastic ring piece 7;

[0057] Limiting assembly 8, limiting piece 81, limiting block 82, limiting threaded hole 83, limiting groove 84, limiting protrusion 85;

[0058] Annular groove 10, limiting groove 20. DETAILED DESCRIPTION

[0059] The technical solutions of the utility model are further illustrated below in combination with the drawings and through specific embodiments.

[0060] In the description of the utility model, it needs to be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0061] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0062] In the description of the utility model, it needs to be explained that, unless otherwise specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0063] A diaphragm filter plate for filter press, comprising a film pressing plate 1, a pressing membrane 2, a mold core plate 3, a filter cloth pressing plate 4, a filter cloth 5, an elastic ring 7 and a limiting assembly 8;

[0064] The film pressing plate 1 and the filter cloth pressing plate 4 are both annular structures, the film pressing plate 1 and the filter cloth pressing plate 4 are sequentially mounted on the outer periphery of the mold core plate 3 from inside to outside, and the pressing membrane 2 is clamped between the film pressing plate 1 and the mold core plate 3;

[0065] The inner bottom of the filter cloth pressing plate 4 is symmetrically provided with two limiting grooves 20;

[0066] The outer end of the filter cloth 5 is arranged in the annular groove 10, and the limiting assembly 8 is arranged in the limiting groove 20.

[0067] The elastic ring member 7 comprises two elastic arc-shaped members, which are half-circular and arranged in the annular groove 10 and pressed on the filter cloth 5.

[0068] The head and tail ends of the two elastic arc-shaped members are respectively pressed on the two sides of the two limiting assemblies 8, and the limiting assembly 8 is used for limiting the movement of the elastic arc-shaped member.

[0069] The filter cloth pressing plate 4, the filter cloth 5, the elastic ring member 7 and the limiting assembly 8 are organically combined together to form a stable and efficient filtering and pressing system.

[0070] The design of the filter cloth pressing plate 4 makes the filter cloth 5 and the filter cloth 5 be effectively clamped in the middle to form a closed filtering space.

[0071] In particular, the elastic ring member 7 comprises two elastic arc-shaped members, which are half-circular and arranged in the annular groove 10 and pressed on the filter cloth 5. The head and tail ends of the two elastic arc-shaped members are respectively pressed on the two sides of the two limiting assemblies 8, and the limiting assembly 8 is used for limiting the movement of the elastic arc-shaped member.

[0072] In summary, the beneficial effects of the utility model are as follows:

[0073] 1. The filter cloth 5 is embedded and installed in the annular groove 10 through the elastic ring member 7, and the movement is limited by the limiting assembly 8, so that the stability and sealing performance of the filter cloth 5 in the filter pressing process are ensured, and the filter cloth 5 is prevented from loosening or falling off.

[0074] 2. The pressing effect is improved: the elastic ring member 7 is pressed on the filter cloth 5, so that the contact between the filter cloth 5 and the filter cloth 5 is more closely, and the pressing effect is improved.

[0075] Further, the inner annular surface of the filter cloth pressing plate 4 is provided with an annular half slot;

[0076] The inner annular surface of the filter cloth pressing plate 4 is provided with an annular half slot;

[0077] When the filter cloth pressing plate 4 and the filter plate 1 are installed in close contact, the two annular half slots are close to each other to form the annular slot 10;

[0078] The outer periphery of the filter cloth 5 is curled to form a filter cloth protruding part 51;

[0079] The elastic ring 7 is pressed above the filter cloth 5, and the filter cloth protruding part 51 is embedded in the annular slot 10 along the annular groove 13.

[0080] Specifically, as shown in Figures 3-4 The filter cloth 5 is placed in the filter plate 1 first, ensuring that the filter cloth protruding part 51 is aligned with the annular groove 13 on the annular boss. Then, the filter cloth pressing plate 4 and the filter plate 1 are closely attached, at which time the two annular half slots merge into the annular slot 10, and the filter cloth protruding part 51 is pressed into the annular slot 10.

[0081] Next, two elastic arc-shaped parts are placed above the filter cloth 5 to form an elastic ring 7, and the ends of the two elastic arc-shaped parts are adjusted to be close to the two limiting grooves 20. The elastic ring 7 is pressed downward to press the filter cloth 5 due to its own elastic force, further ensuring that the filter cloth protruding part 51 is firmly embedded in the annular slot 10, and achieving the close fixation and sealing of the edge of the filter cloth 5.

[0082] Further, the filter plate 1 is provided with a mounting threaded groove 12, which is arranged corresponding to the limiting groove 20;

[0083] The limiting assembly 8 includes a limiting part 81 and a limiting block 82;

[0084] The center of the limiting block 82 is provided with a limiting threaded through hole 83, and the side of the limiting block 82 close to the inner annular surface of the filter cloth pressing plate 4 is provided with a limiting groove 84, and the limiting protruding block 85 is formed beside the limiting groove 84;

[0085] When the limiting block 82 is installed in the limiting groove 20, the limiting groove 84 is in communication with the annular half slot of the filter cloth pressing plate 4, and the limiting protruding block 85 is protrudingly arranged in the annular half slot of the filter cloth pressing plate 4. The limiting groove 84 and the annular half slot are both used for embedding the filter cloth protruding part 51, and the two sides of the limiting protruding block 85 are used for abutting the head and tail ends of the two elastic arc-shaped parts;

[0086] The limiting member 81 is sequentially threaded through the limiting threaded through hole 83 and the upper limiting groove 20, and is threadedly connected with the limiting threaded through hole 83 and the upper limiting groove 20.

[0087] Then, as shown in Figure 4 The limiting block 82 is installed into the limiting groove 20 of the filter cloth pressing plate 4, at this time, the limiting groove 84 is in communication with the annular groove 10 and jointly accommodates the filter cloth protruding part 51, and the head and tail ends of the two elastic arc-shaped members are respectively pressed against the two side faces of the two limiting assemblies 8. Subsequently, the limiting member 81 is threaded through the installation threaded groove 12 of the membrane pressing plate 1 and the limiting threaded through hole 83 of the limiting block 82, and the filter cloth 5 is firmly fixed between the membrane pressing plate 1 and the filter cloth pressing plate 4 through threaded connection.

[0088] Through the fixing effect of the limiting assembly 8, the filter cloth protruding part 51 is tightly clamped in the limiting groove 84 and the annular groove 10, and the effective fixing and sealing of the edge of the filter cloth 5 are realized by using the elastic ring member 7.

[0089] Further, the membrane pressing plate 1, the pressing membrane sheet 2, the mold core plate 3 and the filter cloth pressing plate 4 are fixedly connected through the fixing assembly 6;

[0090] The filter cloth pressing plate 4 is provided with a plurality of first threaded through holes 41 along the circumferential direction thereof;

[0091] The membrane pressing plate 1 is provided with a plurality of second threaded through holes 11 along the circumferential direction thereof;

[0092] The outer periphery of the pressing membrane sheet 2 is provided with a plurality of third threaded through holes 21 along the circumferential direction thereof;

[0093] The outer periphery of the upper plate face of the mold core plate 3 is provided with a plurality of upper threaded grooves 31 along the circumferential direction thereof;

[0094] The first threaded through hole 41, the second threaded through hole 11 and the third threaded through hole 21 all have a hole diameter greater than the upper threaded groove 31;

[0095] The fixing assembly 6 comprises a fixing member 61 and a fixing sleeve 62;

[0096] The fixing sleeve 62 is embedded in the first threaded through hole 41, the second threaded through hole 11 and / or the third threaded through hole 21, and the fixing member 61 is threaded through the fixing sleeve 62 and is threadedly connected with the upper threaded groove 31.

[0097] Specifically, as shown in Figures 3-4As shown, the filter cloth pressing plate 4, the membrane pressing plate 1, the pressing membrane 2 and the mold core plate 3 are respectively provided with a plurality of first threaded holes 41, second threaded holes 11, third threaded holes 21 and upper threaded grooves 31 along their circumferential directions. The arrangement of these threaded holes provides precise positioning and connection points for the subsequent installation of the fixing assembly 6.

[0098] The fixing assembly 6 is known to be composed of a fixing part 61 and a fixing sleeve 62. During installation, the fixing sleeve 62 is first embedded in the first threaded hole 41, the second threaded hole 11 and / or the third threaded hole 21. The presence of the fixing sleeve 62 can enhance the sealing between the pressing membrane 2 and the membrane pressing plate 1 and the mold core plate 3 installed above and below it. When the fixing part 61 is in close contact with the fixing sleeve 62 and is tightened, an effective sealing barrier is formed between them, preventing material leakage from the threaded connection during the filter pressing process. This is crucial for ensuring the filter pressing effect and product quality. Subsequently, the fixing part 61 passes through the first threaded hole 41 of the filter cloth pressing plate 4, the second threaded hole 11 of the membrane pressing plate 1 and the third threaded hole 21 of the pressing membrane 2 from above in sequence, comes into close contact with the fixing sleeve 62 inside them, and finally realizes threaded connection with the upper threaded groove 31 of the mold core plate 3.

[0099] By rotating the fixing part 61 to tightly fit with each threaded hole, a firm connection between the filter cloth pressing plate 4, the membrane pressing plate 1, the pressing membrane 2 and the mold core plate 3 is achieved. This connection not only ensures the stability of the filter pressing plate structure, but also effectively prevents material leakage, ensuring the smooth progress of the filter pressing process.

[0100] Further, the fixing part 61 includes a fixing cap 611 and a threaded rod 612, and the fixing cap 611 is connected to the top end of the threaded rod 612.

[0101] The fixing sleeve 62 is a fixing gasket 621, and the thickness of the fixing gasket 621 is the same as the thickness of the pressing membrane 2 and the depth of the third threaded hole 21. The fixing gasket 621 is embedded in the third threaded hole 21.

[0102] The inner wall of the first threaded hole 41 is provided with a fixing boss 42, which is located on the side of the first threaded hole 41 close to the membrane pressing plate 1. The threaded rod 612 is movably inserted into the fixing boss 42, and the fixing cap 611 is located above the fixing boss 42.

[0103] Further, the fixing part 61 includes a fixing cap 611 and a threaded rod 612, and the fixing cap 611 is connected to the top end of the threaded rod 612.

[0104] The fixing kit 62 includes a fixing washer 621 and a fixing sleeve 622. The fixing washer 621 is connected to the top end of the fixing sleeve 622, and the fixing washer 621 and the fixing sleeve 622 are provided with a through fixing thread hole.

[0105] The inner wall of the first threaded through hole 41 is provided with a fixing boss 42, which is located on the side of the first threaded through hole 41 close to the pressure plate 1.

[0106] The threaded rod 612 is movably inserted into the fixing washer 621 and the fixing sleeve 622, and the fixing washer 621 is located above the fixing boss 42, and the fixing cap 611 is located above the fixing washer 621.

[0107] It is known that the fastener 61 consists of a fixing cap 611 and a threaded rod 612, wherein the fixing cap 611 is connected to the top of the threaded rod 612. This design allows the fastener 61 to provide a clear rotation point during tightening and increases the stability after tightening.

[0108] like Figure 6 As shown, in the first embodiment, the fixing kit 62 is a fixing gasket 621;

[0109] like Figure 7 As shown, in the second embodiment, the fixing kit 62 includes a fixing washer 621 and a fixing sleeve 622;

[0110] The choice can be made based on actual needs. Both embodiments aim to prevent material leakage from the threaded connection during the filter press process.

[0111] Importantly, the fixed boss 42 is a raised portion of the inner wall of the first threaded through hole 41, located on the side close to the pressure plate 1. This design ensures that the threaded rod 612 is guided by the fixed boss 42 during insertion, thereby achieving more accurate positioning.

[0112] Once the threaded rod 612 is fully inserted into the fixed boss 42, the fixing cap 611 will be positioned above the fixed boss 42. At this time, the fixing cap 611 not only prevents the threaded rod 612 from coming out of the first threaded through hole 41, but also increases the stability of the filter press plate structure through its contact with the fixed boss 42.

[0113] To further explain, the upper surface of the mold core plate 3 is provided with an installation ring groove 32;

[0114] The outer periphery of the press film 2 is rolled up to form a film protrusion 22;

[0115] The diaphragm protrusion 22 is embedded in the mounting ring groove 32.

[0116] As Figure 4 , Figure 6 and Figure 7 shown, at the time of installation, the pressing membrane 2 is accurately placed on the mold core plate 3, ensuring that the membrane protrusion 22 is aligned with the installation ring groove 32. Then, the pressing membrane 2 is firmly installed on the mold core plate 3 by the pressing plate 1 and the fixing assembly 6, so that the membrane protrusion 22 is completely embedded in the installation ring groove 32.

[0117] Due to the close fit of the membrane protrusion 22 and the installation ring groove 32, the pressing membrane 2 is effectively fixed on the mold core plate 3, and at the same time, a good sealing effect is formed, preventing the leakage of fluid or material.

[0118] The technical principles of the present application are described above in combination with specific embodiments. These descriptions are only to explain the principles of the present application, and cannot be interpreted in any way as a limitation on the scope of protection of the present application. Based on the explanation here, those skilled in the art can think of other specific embodiments of the present application without creative labor, and these equivalent variations or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A diaphragm filter plate for a filter press, characterized in that It comprises a pressing film plate (1), a pressing membrane (2), a mold core plate (3), a filter cloth pressing plate (4), a filter cloth (5), an elastic ring (7) and a limiting assembly (8); The pressing film plate (1) and the filter cloth pressing plate (4) are both annular structures, and the pressing film plate (1) and the filter cloth pressing plate (4) are sequentially installed from inside to outside on the outer periphery of the mold core plate (3), and the pressing film plate (1) and the mold core plate (3) are provided with the pressing membrane (2) therebetween; The inner side bottom of the pressing film plate (1) and the filter cloth pressing plate (4) is provided with a ring-shaped groove (10) in common, and the inner side bottom of the filter cloth pressing plate (4) is symmetrically provided with two limiting grooves (20); The outer side end of the filter cloth (5) is arranged in the ring-shaped groove (10), and the limiting assembly (8) is arranged in the limiting groove (20); The elastic ring (7) comprises two elastic arc-shaped members, the elastic arc-shaped members are semicircular, and the two elastic arc-shaped members are arranged in the ring-shaped groove (10) and are pressed above the filter cloth (5) by being spliced with each other; The first end and the last end of the two elastic arc-shaped members are respectively abutted against two sides of the two limiting assemblies (8), and the limiting assemblies (8) are used for limiting the movement of the elastic arc-shaped members.

2. The diaphragm filter plate for a filter press according to claim 1, characterized in that The inner annular surface of the filter cloth pressing plate (4) is provided with a ring-shaped half groove; The inner annular surface of the pressing film plate (1) extends inwardly to form a ring-shaped boss, and the side of the ring-shaped boss close to the filter cloth pressing plate (4) is provided with a continuous ring-shaped half groove and a ring-shaped groove (13); When the filter cloth pressing plate (4) and the pressing film plate (1) are attached and installed, the two ring-shaped half grooves are close to each other to form the ring-shaped groove (10); The outer periphery of the filter cloth (5) is curled to form a filter cloth protruding part (51); The elastic ring (7) is pressed above the filter cloth (5) and embeds the filter cloth protruding part (51) in the ring-shaped groove (10) along the ring-shaped groove (13).

3. The diaphragm filter plate for a filter press according to claim 2, characterized in that The pressing film plate (1) is provided with a mounting threaded groove (12), and the mounting threaded groove (12) is arranged corresponding to the limiting groove (20); The limiting assembly (8) comprises a limiting member (81) and a limiting block (82); The center of the limiting block (82) is provided with a limiting threaded through hole (83), and the side of the limiting block (82) close to the inner annular surface of the filter cloth pressing plate (4) is provided with a limiting groove (84), and the limiting protruding block (85) is formed beside the limiting groove (84); When the limiting block (82) is installed in the limiting groove (20), the limiting groove (84) is communicated with the ring-shaped half groove of the filter cloth pressing plate (4), the limiting protruding block (85) is protrudingly arranged in the ring-shaped half groove of the filter cloth pressing plate (4), the limiting groove (84) and the ring-shaped half groove are both used for embedding the filter cloth protruding part (51), and the two sides of the limiting protruding block (85) are used for abutting against the first end and the last end of the two elastic arc-shaped members; The limiting member (81) sequentially penetrates the limiting threaded through hole (83) and the upper limiting groove (20) and is threadedly connected with the limiting threaded through hole (83) and the upper limiting groove (20).

4. The diaphragm filter plate for a filter press according to claim 1, characterized in that The pressing film plate (1), the pressing membrane sheet (2), the mold core plate (3) and the filter cloth pressing plate (4) are fixedly connected through a fixing assembly (6); A plurality of first threaded through holes (41) are arranged at intervals along the circumferential direction of the filter cloth pressing plate (4); A plurality of second threaded through holes (11) are arranged at intervals along the circumferential direction of the pressing film plate (1); A plurality of third threaded through holes (21) are arranged at intervals along the circumferential direction of the outer periphery of the pressing membrane sheet (2); A plurality of upper threaded grooves (31) are arranged at intervals along the circumferential direction of the outer periphery of the upper plate surface of the mold core plate (3); The hole diameters of the first threaded through holes (41), the second threaded through holes (11) and the third threaded through holes (21) are all greater than those of the upper threaded grooves (31); The fixing assembly (6) comprises a fixing member (61) and a fixing sleeve member (62); The fixing sleeve member (62) is embedded in the first threaded through holes (41), the second threaded through holes (11) and / or the third threaded through holes (21), and the fixing member (61) is threadedly connected with the upper threaded grooves (31) through the fixing sleeve member (62).

5. The diaphragm filter plate for a filter press according to claim 4, characterized in that The fixing member (61) comprises a fixing cap (611) and a threaded rod (612), and the fixing cap (611) is connected to the top end of the threaded rod (612); The fixing sleeve member (62) is a fixing gasket (621), the thickness of the fixing gasket (621) is the same as the thickness of the pressing membrane sheet (2) and the depth of the third threaded through holes (21), and the fixing gasket (621) is embedded in the third threaded through holes (21); A fixing boss (42) is arranged on the inner wall of the first threaded through hole (41) in a protruding manner, the fixing boss (42) is located on the side of the first threaded through hole (41) close to the pressing film plate (1), the threaded rod (612) is movably inserted into the fixing boss (42), and the fixing cap (611) is located above the fixing boss (42).

6. The diaphragm filter plate for a filter press according to claim 4, characterized in that The fixing member (61) comprises a fixing cap (611) and a threaded rod (612), and the fixing cap (611) is connected to the top end of the threaded rod (612); The fixing sleeve member (62) comprises a fixing gasket (621) and a fixing sleeve (622), the fixing gasket (621) is connected to the top end of the fixing sleeve (622), and the fixing gasket (621) and the fixing sleeve (622) are provided with a through fixing threaded through hole; The fixing boss (42) is arranged on the inner wall of the first threaded through hole (41) in a protruding manner; The threaded rod (612) is movably inserted into the fixing gasket (621) and the fixing sleeve (622), and the fixing gasket (621) is located above the fixing boss (42), and the fixing cap (611) is located above the fixing gasket (621).

7. The filter plate according to claim 1, wherein The upper plate surface of the mold core plate (3) is provided with a mounting ring groove (32); The outer periphery of the pressing membrane sheet (2) is curled to form a membrane sheet protruding portion (22); The membrane tab (22) is embedded in the mounting ring groove (32).

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