Plate-and-frame filter press with anti-sticking filter plate

Abstract

The application discloses a plate-and-frame filter press capable of preventing filter plate adhesion, and belongs to the technical field of sewage treatment equipment, which comprises a rack, a pressing mechanism and a thrust plate are fixedly connected to the rack, symmetrical first guide rails are arranged on the rack, a plurality of filter plates are connected to the first guide rails, symmetrical second guide rails are arranged on the rack, and a pull plate trolley is slidably connected to the second guide rails, a locking mechanism is arranged on each filter plate, the filter plates between the pressing mechanism and the thrust plate are abutted by the pressing mechanism, the first filter plate close to the thrust plate is locked with the thrust plate through the locking mechanism, and the adjacent filter plates are locked with each other through the locking mechanism; after the pressing mechanism is away from the filter plates, the pull plate trolley reciprocates in the direction of the second guide rails, the locking mechanism of the first filter plate close to the pressing mechanism is unlocked by the pull plate trolley, so that the filter plate is separated from the previous filter plate, and then the filter plate is pulled to move to one end away from the thrust plate.

Description

Technical Field

[0001] This invention belongs to the technical field of wastewater treatment equipment, and particularly relates to a plate and frame filter press that prevents filter plates from sticking together. Background Technology

[0002] With social development and progress, industrial, agricultural and domestic sewage is increasing. Sewage treatment equipment is generally used to treat sewage to meet the water quality requirements for discharge into a water body or reuse, which is a process of purification.

[0003] In wastewater treatment processes, plate and frame filter presses are mostly used for sludge dewatering. However, for wastewater containing high organic matter content, rich colloidal substances, or viscous polymers, such as starch processing wastewater, beverage wastewater, dyeing and printing wastewater, and some pharmaceutical wastewater, the filter cake produced by the plate and frame filter press is often very viscous and easily sticks to adjacent filter plates, affecting the normal opening and separation of the filter plates. It may even require manual prying, which not only increases the difficulty of operation and labor intensity, but may also cause deformation and damage to the filter plates due to uneven force.

[0004] Therefore, there is an urgent need to design a plate and frame filter press that prevents filter plates from sticking together, so as to solve the problem of filter plates sticking together in the plate and frame filter press mentioned above. Summary of the Invention

[0005] To address the technical problem of filter plate adhesion in plate and frame filter presses mentioned in the background art, a plate and frame filter press with anti-filter plate adhesion is provided to solve the above-mentioned problem.

[0006] To achieve the above objectives, the specific technical solution of the plate and frame filter press for preventing filter plate adhesion of the present invention is as follows:

[0007] A plate and frame filter press for preventing filter plate adhesion includes a frame, a pressing mechanism and a thrust plate fixedly connected to the frame, symmetrical first guide rails on the frame with multiple filter plates connected to them, symmetrical second guide rails on the frame with a plate-pulling trolley slidably connected to them, and a locking mechanism on each filter plate.

[0008] The clamping mechanism presses the filter plates between the clamping mechanism and the thrust plate together. The first filter plate closest to the thrust plate is locked to the thrust plate by the locking mechanism, and adjacent filter plates are locked to each other by the locking mechanism.

[0009] After the clamping mechanism moves away from the filter plate, the plate-pulling trolley reciprocates along the second guide rail.

[0010] The pulling trolley unlocks the locking mechanism of the first filter plate near the pressing mechanism, so that the filter plate is separated from the previous filter plate. Then, it pulls the filter plate to move away from the thrust plate. This action is repeated until the pulling trolley unlocks the locking mechanism of the first filter plate near the thrust plate, so that the first filter plate near the thrust plate is separated from the thrust plate. Then, it pulls the filter plate to move away from the thrust plate.

[0011] Preferably, the filter plate includes a plate body and hooks. The hooks are fixedly connected to both sides of the plate body and connected to the first guide rail. A locking mechanism is provided on the hooks. The clamping assembly of the plate pulling trolley cooperates with the hooks and the locking mechanism to pull the filter plate.

[0012] Preferably, the locking mechanism includes a first locking member and a second locking member, both of which are mounted on the hook. The second locking member is used to lock with the first locking member. An unlocking member is connected to the second locking member. The unlocking member cooperates with the clamping assembly of the pull-plate trolley. The clamping assembly of the pull-plate trolley causes the second locking member to disengage from the first locking member by triggering the unlocking member.

[0013] Preferably, the hook is provided with a first limiting groove and a button limiting groove;

[0014] The first locking element includes a first hook tongue, which is fixedly connected to the hook.

[0015] The second locking element includes a second hook tongue, which is rotatably connected in the first limiting groove. A first spring is provided on the second hook tongue, and a spring limiting groove is provided on the hook. The spring limiting groove communicates with the first limiting groove. One end of the first spring is connected to the spring limiting groove, and the end of the first spring away from the spring limiting groove is connected to the second hook tongue, so that the first spring provides a force for the second hook tongue to rotate counterclockwise.

[0016] The unlocking component includes a button that is slidably connected in a button limiting groove. A second spring is connected between the button and the button limiting groove. A slide is provided on the hook. The slide is connected to the first limiting groove and the button limiting groove. A slider is slidably connected in the slide. One end of the slider is slidably connected to the button through an inclined surface. The end of the slider away from the inclined surface abuts against the second hook tongue.

[0017] The clamping assembly of the pull plate trolley pushes the button to the right, compressing the second spring. The button then drives the slider to move upward along the slide via the inclined plane, causing the slider to drive the second hook tongue to rotate clockwise.

[0018] Preferably, the thrust plate has a groove, and a third hook tongue is provided in the groove, which is used to lock with the second hook tongue.

[0019] Preferably, thermal resistance wires are arranged inside the plate to heat the filter cake. The first and second locking members are made of conductive metal and are electrically connected to each other on the same filter plate. The thermal resistance wires inside the filter plate are energized through the first and second locking members. The positive and negative terminals of the power supply are respectively connected to the two third hooks on the thrust plate, thereby electrically connecting multiple filter plates to form a parallel circuit.

[0020] Preferably, a rotating shaft is fixedly connected to the first hook tongue, and the first hook tongue is rotatably connected to the first limiting groove through the rotating shaft, thereby forming a current transmission path between the first locking member and the second locking member.

[0021] Preferably, the first hook tongue includes a first hook body and a first hook, with the first hook body and the first hook being fixedly connected. The second hook tongue includes a second hook body and a second hook, with the second hook body and the second hook being fixedly connected. When the second locking member disengages from the first locking member, the top surface of the first hook body is higher than the bottom surface of the second hook.

[0022] Preferably, the thermal resistance wire is spirally arranged inside the plate.

[0023] Preferably, the hook is provided with a first insulating sleeve and a second insulating sleeve, the first hook tongue is located inside the first insulating sleeve, the second hook tongue is located inside the second insulating sleeve, and the second insulating sleeve is used to engage with the first insulating sleeve of the previous filter plate.

[0024] The plate and frame filter press of the present invention, which prevents filter plates from sticking together, has the following advantages:

[0025] This invention constructs a precise and reliable mechanical locking and linkage unlocking mechanism, which completely eliminates the need for manual prying. Through the cooperation of the locking mechanism and the plate pulling trolley, the filter plates are automatically unlocked and separated, reducing manual intervention, avoiding damage caused by manual prying, and extending the service life of the equipment.

[0026] This invention features a spiral arrangement of thermal resistance wires within the filter plate body, forming a uniformly distributed heating network. This ensures that heat can be evenly conducted to the entire surface of the filter plate, avoiding localized overheating or uneven heating. This significantly reduces the capillary water content of the filter plate, lowering the filter cake viscosity at the source. Simultaneously, the locking mechanism acts as a current transmission carrier. When adjacent filter plates are locked, the hooks automatically connect the circuit upon contact, and automatically disconnect upon separation, achieving safe and intelligent power-on / off control. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the plate and frame filter press structure for preventing filter plate adhesion according to the present invention;

[0028] Figure 2 This is a schematic diagram of the filter plate structure of the present invention;

[0029] Figure 3 This is a schematic diagram showing the connection between the first locking member and the second locking member of the present invention;

[0030] Figure 4 This is a schematic diagram of the structure of the first locking member and the second locking member of the present invention;

[0031] Figure 5 This is a schematic diagram of the thrust plate structure of the present invention;

[0032] Figure 6 This is a schematic diagram showing the connection between the thrust plate and the second locking member of the present invention;

[0033] Figure 7 This is a schematic diagram of the internal structure of the plate body of the present invention.

[0034] Explanation of markings in the diagram: 1. Frame; 2. Clamping mechanism; 3. Thrust plate; 31. Groove; 32. Third hook tongue; 4. First guide rail; 5. Second guide rail; 6. Filter plate; 61. Plate body; 611. Thermal resistance wire; 62. Hook; 621. First limiting groove; 622. Button limiting groove; 623. Spring limiting groove; 624. Slide rail; 625. First insulating sleeve; 626. Second insulating sleeve; 7. Locking mechanism; 71. First lock Fixed component; 711, first hook tongue; 7111, rotating shaft; 7112, first hook body; 7113, first tongue hook; 72, second locking component; 721, second hook tongue; 7211, second hook body; 7212, second tongue hook; 722, first spring; 73, unlocking component; 731, button; 732, slider; 733, second spring; 8, pull plate trolley; 81, clamping assembly; 811, first gripper; 812, second gripper. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0037] The following is a reference to the appendix. Figure 1 To be continued Figure 7The present invention describes a plate and frame filter press for preventing filter plate adhesion.

[0038] Plate and frame filter presses, as a long-established solid-liquid separation device, achieve effective separation of solids and liquids in suspensions through high-pressure filtration. Their basic working principle is as follows: under hydraulic or mechanical pressure, alternating filter plates 6 and filter frames are pressed together to form a sealed filter chamber. The suspension enters the filter chamber under pump pressure, where solid particles are trapped by the filter cloth to form a filter cake, while the liquid passes through the filter cloth and is discharged as filtrate. However, for filters containing high concentrations of organic components, colloidal substances, or viscous polymers, the filter cake formed after filtration has extremely strong viscosity. This viscous filter cake will firmly adhere between adjacent filter plates 6, preventing normal separation and significantly reducing production efficiency.

[0039] Therefore, the present invention provides a plate and frame filter press with anti-adhesion filter plates 6, such as Figure 1 and Figure 2 As shown, the device includes a frame 1, on which a pressing mechanism 2 and a thrust plate 3 are fixedly connected. A symmetrical first guide rail 4 is provided on the frame 1, and multiple filter plates 6 are connected to the first guide rail 4. A symmetrical second guide rail 5 is provided on the frame 1, and a pull plate trolley 8 is slidably connected to the second guide rail 5. Each filter plate 6 is equipped with a locking mechanism 7. The pressing mechanism 2 presses the filter plate 6 between the pressing mechanism 2 and the thrust plate 3 together. The first filter plate 6 closest to the thrust plate 3 is locked to the thrust plate 3 by the locking mechanism 7, and adjacent filter plates 6 are locked to each other by the locking mechanism 7. After mechanism 2 moves away from filter plate 6, the plate-pulling trolley 8 reciprocates in the direction of the second guide rail 5. The plate-pulling trolley 8 unlocks the locking mechanism 7 of the first filter plate 6 near the pressing mechanism 2, so that the filter plate 6 is separated from the previous filter plate 6. Then, it pulls the filter plate 6 to move away from the thrust plate 3. The action is repeated until the plate-pulling trolley 8 unlocks the locking mechanism 7 of the first filter plate 6 near the thrust plate 3, so that the first filter plate 6 near the thrust plate 3 is separated from the thrust plate 3. Then, it pulls the filter plate 6 to move away from the thrust plate 3.

[0040] Specifically, during the pressing mechanism 2's pressing of multiple filter plates 6, the locking mechanism 7 achieves stable locking between the filter plates 6 and between the filter plates 6 and the thrust plate 3. Then, through the reciprocating motion of the pull plate trolley 8 on the second guide rail 5, the locking mechanism 7 coordinates with the movement of the pull plate trolley 8, causing the pull plate trolley 8 to unlock and pull the filter plates 6 in sequence. This solves the problem of filter plates 6 being difficult to separate after sticking together in traditional filter presses. No manual prying is required. The automatic unlocking and pulling of the filter plates 6 by the pull plate trolley 8 reduces the difficulty of operation and labor intensity, and realizes the automated control of filter plate 6 separation, which is suitable for high-viscosity filter cake conditions.

[0041] like Figure 1 and Figure 2As shown, the filter plate 6 includes a plate body 61 and hooks 62. The hooks 62 are fixedly connected to both sides of the plate body 61 and connected to the first guide rail 4. The locking mechanism 7 is set on the hooks 62. The clamping assembly 81 of the pull plate trolley 8 cooperates with the hooks 62 and the locking mechanism 7 to pull the filter plate 6. Specifically, the hooks 62 are used to connect with the first guide rail 4 to ensure that the filter plate 6 moves stably along the first guide rail 4. The hooks 62 also serve as the carrier for the cooperation between the locking mechanism 7 and the clamping assembly 81 of the pull plate trolley 8, so that the pull plate trolley 8 can trigger the locking mechanism 7 by abutting the hooks 62 to unlock and pull the filter plate 6.

[0042] As a preferred option, such as Figure 3 As shown, the locking mechanism 7 includes a first locking member 71 and a second locking member 72. Both the first locking member 71 and the second locking member 72 are mounted on the hook 62. The second locking member 72 is used to lock with the first locking member 71. An unlocking member 73 is connected to the second locking member 72. The unlocking member 73 cooperates with the clamping assembly 81 of the pull plate trolley 8. The clamping assembly 81 of the pull plate trolley 8 triggers the unlocking member 73 to disengage the second locking member 72 from the first locking member 71. Specifically, the connection between the filter plates 6 is achieved by the locking of the first locking member 71 and the second locking member 72. The unlocking is achieved by the cooperation of the unlocking member 73 with the clamping assembly 81 of the pull plate trolley 8. The unlocking member 73 is triggered by the pull plate trolley 8 to achieve automatic unlocking without manual intervention. The locking and unlocking functions are separated, resulting in high reliability and solving the problem of disordered separation caused by the lack of a locking structure in traditional filter plates 6.

[0043] As a preferred option, such as Figure 4As shown, the hook 62 has a first limiting groove 621 and a button limiting groove 622; the first locking member 71 includes a first hook tongue 711, which is fixedly connected to the hook 62; the second locking member 72 includes a second hook tongue 721, which is rotatably connected within the first limiting groove 621; a first spring 722 is provided on the second hook tongue 721; the hook 62 has a spring limiting groove 623, which communicates with the first limiting groove 621; one end of the first spring 722 is connected to the spring limiting groove 623, and the end of the first spring 722 away from the spring limiting groove 623 is connected to the second hook tongue 721, thereby providing the first spring 722 with a force for the second hook tongue 721 to rotate counterclockwise; the unlocking member 73 includes a button 731, which is slidably connected within the button limiting groove 622; a second spring is connected between the button 731 and the button limiting groove 622. Spring 733, hook 62 has a slide 624, slide 624 communicates with first limiting groove 621 and button limiting groove 622, slider 732 is slidably connected in slide 624, one end of slider 732 is slidably connected to button 731 through inclined surface, the end of slider 732 away from inclined surface abuts against second hook tongue 721; the clamping assembly 81 of pull plate trolley 8 pushes button 731 to move closer to second spring 733, causing second spring 733 to compress, button 731 drives slider 732 to move through inclined surface, thereby causing slider 732 to provide force for second hook tongue 721 to rotate clockwise, thereby unlocking second locking member 72 from first locking member 71. Specifically, locking is achieved by first hook tongue 711 and second hook tongue 721, and unlocking is triggered by unlocking member 73 composed of button 731, slider 732 and second spring 733 in conjunction with clamping assembly 81 of pull plate trolley 8. In a specific implementation, such as Figures 1-4 As shown, the clamping assembly 81 of the pull plate trolley 8 includes a first clamp 811 and a second clamp 812. The first clamp 811 moves toward the thrust plate 3. When the first clamp 811 passes the hook 62 of the filter plate to be unlocked 6, it is pressed down. After the first clamp 811 passes through the hook 62 of the filter plate to be unlocked 6, the first clamp 811 rebounds. At this time, the pull plate trolley 8 moves away from the thrust plate 3. The first clamp 811 abuts against and pushes the button 731 to move to the right along the button limiting groove 622 slide. The button 731 pushes the slider 732 to move upward along the slide 624 through the inclined surface cooperation, forcing the second hook tongue 721 to overcome the spring force of the first spring 722 and rotate clockwise to disengage from the first hook tongue 711, thereby unlocking the filter plate to be unlocked 6 from the previous filter plate 6. After unlocking, the pull plate trolley 8 drives the filter plate 6 to move, so that the filter plate 6 moves away from the thrust plate 3 along the first guide rail 4.

[0044] As a preferred option, such as Figure 5 and Figure 6As shown, a groove 31 is provided on the thrust plate 3, and a third hook tongue 32 is provided in the groove 31. The third hook tongue 32 is used to lock with the second hook tongue 721. The third hook tongue 32 is provided on the thrust plate 3 to match the locking mechanism 7 of the filter plate 6, so that the first filter plate 6 near the thrust plate 3 can be locked with the third hook tongue 32 by its own second locking member 72, ensuring the initial fixation of the filter plate group in the compressed state.

[0045] As a preferred option, such as Figure 7 As shown, a thermal resistance wire 611 is arranged inside the plate 61 to heat the filter cake. The first locking member 71 and the second locking member 72 are made of conductive metal. The first locking member 71 and the second locking member 72 on the same filter plate 6 are electrically connected. The thermal resistance wire 611 inside the filter plate 6 is energized through the first locking member 71 and the second locking member 72. The positive and negative terminals of the power supply are respectively connected to the two third hooks 32 on the thrust plate 3, so that multiple filter plates 6 are electrically connected to form a parallel circuit. In a specific embodiment, the positive terminal of the power supply is connected to the third hook 32 of the left thrust plate 3, and the negative terminal of the power supply is connected to the third hook 32 of the right thrust plate 3. The current between each filter plate 6 passes through the left locking member, the thermal resistance wire 611, and then enters the right locking member, thereby heating each filter plate 6.

[0046] As a preferred option, such as Figure 4 As shown, a rotating shaft 7111 is fixedly connected to the first hook tongue 711. The first hook tongue 711 is rotatably connected to the first limiting groove 621 through the rotating shaft 7111, thereby forming a current transmission path between the first locking member 71 and the second locking member 72. Specifically, the first hook tongue 711 is rotatably connected to the hook 62 through the rotating shaft 7111, which not only ensures the locking and unlocking action of the first hook tongue 711 and the second hook tongue 721, but also makes the first hook tongue 711 and the second hook tongue 721 part of the current transmission path, ensuring the continuity of the thermal resistance wire 611 circuit.

[0047] Preferably, the first hook tongue 711 includes a first hook body 7112 and a first hook 7113, with the first hook body 7112 and the first hook 7113 fixedly connected. The second hook tongue 721 includes a second hook body 7211 and a second hook 7212, with the second hook body 7211 and the second hook 7212 fixedly connected. When the second locking member 72 disengages from the first locking member 71, as... Figure 4 As shown, the top surface of the first hook body 7112 is slightly higher than the bottom surface of the second hook 7212, thereby ensuring that when the first hook tongue 711 and the second hook tongue 721 are locked, the second hook 7212 is stably abutted against the first hook body 7112, avoiding circuit disconnection and ensuring normal current transmission.

[0048] As a preferred option, such as Figure 7As shown, the thermal resistance wire 611 is spirally arranged inside the plate 61 to ensure that each area of ​​the filter plate 6 is heated evenly, while also making room for the central through hole of the filter plate 6.

[0049] As a preferred option, such as Figure 4 As shown, the hook 62 is provided with a first insulating sleeve 625 and a second insulating sleeve 626. The first hook tongue 711 is located inside the first insulating sleeve 625, and the second hook tongue 721 is located inside the second insulating sleeve 626. The second insulating sleeve 626 is used to cooperate with the first insulating sleeve 625 of the preceding filter plate 6 for insertion. Specifically, the first insulating sleeve 625 and the second insulating sleeve 626 can cooperate to achieve insulation isolation between the locking components of adjacent filter plates 6. At the same time, the insulating sleeves protect the hook tongues, reduce the contamination of the locking components by filter cake impurities, and extend the life of the locking mechanism 7. The insertion cooperation guides the locking components to accurately align, improving the locking reliability.

[0050] This invention constructs a precise and reliable mechanical locking and linkage unlocking mechanism, which completely eliminates the need for manual prying. Through the cooperation of the locking mechanism 7 and the plate pulling trolley 8, the filter plate 6 is automatically unlocked and separated, reducing manual intervention, avoiding damage caused by manual prying, and extending the service life of the equipment.

[0051] This invention features a spiral arrangement of thermal resistance wires 611 within the filter plate 6 body 61, forming a uniformly distributed heating network. This ensures that heat can be evenly conducted to the entire surface of the filter plate 6, avoiding local overheating or uneven heating. This significantly reduces the capillary water content of the filter plate 6, thereby lowering the filter cake viscosity at the source. Simultaneously, the locking mechanism 7 acts as a current transmission carrier. When adjacent filter plates 6 are locked, the hooks automatically connect the circuit upon contact, and automatically disconnect when separated, achieving safe and intelligent power-on / off control.

[0052] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A plate-and-frame filter press for preventing filter plate blinding, characterized in that, The utility model relates to a filter press, which comprises a rack, a pressing mechanism and a thrust plate fixedly connected to the rack, symmetrical first guide rails arranged on the rack, a plurality of filter plates connected to the first guide rails, symmetrical second guide rails arranged on the rack, a pull plate trolley slidably connected to the second guide rails, a locking mechanism arranged on each filter plate, The pressing mechanism abuts against the filter plates between the pressing mechanism and the thrust plate, the first filter plate close to the thrust plate is locked with the thrust plate through the locking mechanism, and the adjacent filter plates are locked with each other through the locking mechanism; After the pressing mechanism moves away from the filter plates, the pull plate trolley reciprocates in the direction of the second guide rails, The pull plate trolley unlocks the locking mechanism of the first filter plate close to the pressing mechanism, so that the first filter plate is separated from the previous filter plate, and then the first filter plate is pulled to move to one end away from the thrust plate, and the operation is repeated until the pull plate trolley unlocks the locking mechanism of the first filter plate close to the thrust plate, so that the first filter plate close to the thrust plate is separated from the thrust plate, and then the first filter plate is pulled to move to one end away from the thrust plate; The filter plate comprises a plate body and a hook, the hook is fixedly connected to the two sides of the plate body, the hook is connected to the first guide rail, the locking mechanism is arranged on the hook, and the clamping assembly of the pull plate trolley cooperates with the hook and the locking mechanism to pull the filter plate to move; The locking mechanism comprises a first locking piece and a second locking piece, the first locking piece and the second locking piece are both mounted on the hook, the second locking piece is used for locking with the first locking piece, the second locking piece is connected with an unlocking piece, the unlocking piece cooperates with the clamping assembly of the pull plate trolley, and the clamping assembly of the pull plate trolley triggers the unlocking piece to make the second locking piece separate from the first locking piece; The hook is provided with a first limiting groove and a button limiting groove; The first locking piece comprises a first hook tongue, and the first hook tongue is fixedly connected to the hook; The second locking piece comprises a second hook tongue, the second hook tongue is rotatably connected in the first limiting groove, the second hook tongue is provided with a first spring, the hook is provided with a spring limiting groove, the spring limiting groove is communicated with the first limiting groove, one end of the first spring is connected with the spring limiting groove, the other end of the first spring away from the spring limiting groove is connected with the second hook tongue, and thus the first spring provides a force for rotating the second hook tongue in the counterclockwise direction; The unlocking piece comprises a button, the button is slidably connected in the button limiting groove, the button is connected with the second spring between the button limiting groove, the hook is provided with a sliding groove, the sliding groove is communicated with the first limiting groove and the button limiting groove, a sliding block is slidably connected in the sliding groove, one end of the sliding block is slidably connected with the button through an inclined surface, and the other end of the sliding block away from the inclined surface is abutted with the second hook tongue; The clamping assembly of the pull plate trolley pushes the button to move rightwards, the second spring is compressed, the button drives the sliding block to move upwards along the sliding groove through the inclined surface, and the sliding block drives the second hook tongue to rotate in the clockwise direction; The thrust plate is provided with a groove, a third hook tongue is arranged in the groove, and the third hook tongue is used for locking with the second hook tongue. The heat resistance wire is arranged in the plate body to heat the filter cake, the first locking member and the second locking member are made of conductive metal, the first locking member and the second locking member on the same filter plate are conductively connected, the heat resistance wire in the filter plate is powered through the first locking member and the second locking member, and the positive and negative poles of the power supply are respectively communicated with the two third hooks on the thrust plate, so that the plurality of filter plates are electrically connected to form a parallel circuit.

2. The plate and frame filter press of claim 1, wherein, The first hook tongue is fixedly connected with a rotating shaft, and the first hook tongue is rotatably connected in the first limiting groove through the rotating shaft, so as to form a current transmission path between the first locking member and the second locking member.

3. The plate-and-frame filter press according to claim 1 or 2, characterized in that The first hook tongue comprises a first hook body and a first tongue hook, the first hook body is fixedly connected with the first tongue hook, the second hook tongue comprises a second hook body and a second tongue hook, and the second hook body is fixedly connected with the second tongue hook, when the second locking member is separated from the first locking member, the top surface of the first hook body is higher than the bottom surface of the second tongue hook.

4. The plate and frame filter press of claim 1, wherein, The heat resistance wire is spirally arranged in the plate body.

5. The plate-and-frame filter press of claim 1, wherein, The hook is provided with a first insulating sleeve and a second insulating sleeve, the first hook tongue is located in the first insulating sleeve, the second hook tongue is located in the second insulating sleeve, and the second insulating sleeve is used for cooperating with the first insulating sleeve of the previous filter plate to be inserted.

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