A pressure filtration type chemical wastewater treatment device and method

Abstract

The present invention relates to the technical field of pressure filtration, and specifically discloses a pressure filtration type chemical wastewater treatment device and method, including a filter press. Cross plates for restraining the filter plates are fixedly connected to both sides of the filter press. The number of cross plates is two groups, located on both sides of the filter plates. A bearing rod is fixedly connected to one side of the filter plate, and a pull plate mechanism for assisting the unfolding of the filter plate and facilitating the discharge of the filter cake from the filter plate is provided on the same side. By adopting a connecting frame, a first traction wheel, and a second traction wheel, a working mode similar to that of a crawler is formed. With the cooperation of a flap that flips due to its own gravity, the bearing rod and the filter plate are lifted, increasing the potential energy of the filter plate. After the flap that blocks the filter plate is removed, the filter plate falls downward and collides with the cross plate. Through the collision, the sludge adhered to the surface is shaken off. Compared with the existing cylinder vibration technology, it is more direct, has a larger vibration amplitude, and stronger sewage discharge capacity. Moreover, in the above process, the separation of a single group among multiple groups of filter plates is completed. The structure is compact, and there is no need to independently arrange gas pipelines.

Description

Technical Field

[0001] The invention relates to the technical field of filter pressing, and in particular to a filter pressing type chemical wastewater treatment device and method. Background Art

[0002] Filter press is widely used for solid-liquid separation of wastewater. It can efficiently intercept suspended solids in chemical wastewater through filter media (such as filter cloth), making solid-liquid separation more thorough. The filtrate after separation has high clarity and can effectively remove solid impurities such as heavy metal hydroxide precipitation and chemical sludge in wastewater, reducing the suspended matter content of wastewater. It mainly uses pumps or compressed air to apply pressure to wastewater to form a pressure difference on both sides of the filter cloth, so that the solid particles in the chemical wastewater are blocked by the filter cloth and remain in the filter chamber to form a filter cake, and the filtrate is discharged through the filter cloth;

[0003] After the filter press is finished filtering, the filter cake in the middle of the filter press plate needs to be discharged. However, due to the disorder of chemical wastewater substances and the uneven viscosity of the filter cake, it is easy to adhere to the surface of the filter press plate when discharging. Although the existing vibration structure composed of cylinders can knock the shoe plate, it is often done by a small frequency and multiple vibrations. Due to structural limitations, the vibration force is insufficient and cannot meet the discharge of high-viscosity wastewater sludge;

[0004] To this end, we propose a filter press type chemical wastewater treatment device and method. Summary of the invention

[0005] The object of the present invention is to provide a filter press type chemical wastewater treatment device to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a filter press type chemical wastewater treatment device, comprising a filter press, wherein two sides of the filter press are fixedly connected with transverse plates for constraining the filter press plates, and the transverse plates are in two groups and are located on both sides of the filter press plates;

[0007] A bearing rod is fixedly connected to one side of the filter press plate, and a plate pulling mechanism is provided on the same side to assist the filter press plate in unfolding and facilitate the filter press plate to discharge the filter cake;

[0008] The plate pulling mechanism as a whole is composed of a vertical part and a horizontal part, and is distributed in an "L" shape. The vertical part is composed of a connecting frame and multiple groups of track plates. The track plates push the load-bearing rods to change the height of the filter press plate to increase potential energy. The filter press plate can also be moved from one side of the plate pulling mechanism to the other side, during which the potential energy is released. The mud discharge capacity is enhanced by the kinetic energy of the impact of the filter press plate. The horizontal part is composed of a slide rail and a slide table. The slide table moves along the slide rail to complete the deployment of the filter press plate.

[0009] The first slide rail is fixedly connected to the outer surface of the cross plate on one side, and the slide table slides on the surface of the first slide rail. The drawing plate mechanism further includes a fixing plate. One end of the fixing plate is fixedly connected to the connecting frame, and the other end is connected to the slide table. The upper and lower ends of the connecting frame are respectively rotatably connected with a second traction wheel and a first traction wheel through a rotating shaft. The tread plate is sleeved on the outer surfaces of the first traction wheel, the second traction wheel and the connecting frame. The outer surface of the tread plate is rotatably connected with a flap through a rotating shaft. The outer surface of the tread plate is fixedly connected with a reverse stop block.

[0010] A linear motor is provided on the outer surface of the slide table. The linear motor is composed of a mover and a stator. The stator is fixedly connected to the slide table, and the mover slides inside the stator. The mover is fixedly connected to the other end of the fixing plate.

[0011] The reverse stop block is designed in a triangular structure. The number of tread plates is several groups, and they are connected end to end to form an ellipse.

[0012] One end of the first traction wheel is fixedly connected with a driven wheel. A driving motor is fixedly connected to the surface of the slide table. The output end of the driving motor is fixedly connected with a driving wheel. A transmission belt is sleeved between the driving wheel and the driven wheel.

[0013] An auxiliary groove is opened on the outer surface of the slide table. An auxiliary block slides inside the auxiliary groove. One end of the auxiliary block is rotatably connected with an auxiliary wheel through a rotating shaft. The auxiliary wheel is in contact with the inner side of the transmission belt. A first spring is fixedly connected between the auxiliary block and the auxiliary groove.

[0014] A second slide rail is fixedly connected to the outer surface of the cross plate on the other side. A slider slides on the surface of the second slide rail. A guiding sleeve is fixedly connected to the upper end of the slider. A guiding groove is opened inside the guiding sleeve. The guiding groove is open, and a guiding rod is telescopically and slidably connected inside. The guiding rod is fixedly connected to the filter pressing plate.

[0015] One end of the slide table perpendicular to the mover on the outer surface is fixedly connected with a restraint plate. An electromagnet is fixedly connected to the lower end of the restraint plate. A slot is opened on the outer surface of the mover. A restraint groove is opened on the surface of the restraint plate. A restraint rod slides inside the restraint groove. One end of the restraint rod is fixedly connected with an insertion plate. The insertion plate is inserted into the slot. A second spring is fixedly connected between the insertion plate and the electromagnet.

[0016] The insertion plate is made of magnetic metal, and the second spring is in a compressed and energy-storing state.

[0017] A filter press type chemical wastewater treatment method includes the following steps;

[0018] S1. The filter press presses the filter pressing plate tightly, fills wastewater into the filter pressing plate, and performs solid-liquid separation through the filter pressing plate. After reaching the preset filtration time, the filtration stage is basically completed;

[0019] S2. Loosen the compressed filter plates through the filter press. The plate pulling mechanism is driven by the sliding table to drive the filter plates to unfold, and the sludge in the middle of the filter plates is discharged.

[0020] S3. Drive the first traction wheel to rotate through the drive motor. The first traction wheel drives the tread plate to rotate. Push the filter plate upward through the turning plate and turn over the vertical part of the plate pulling mechanism. Under the action of gravity, the filter plate impacts the cross plate, which is convenient for shaking off the sludge adhering to the surface of the filter plate.

[0021] The present invention has at least the following beneficial effects:

[0022] By adopting the connecting frame, the first traction wheel and the second traction wheel to form a working mode similar to that of a crawler, and cooperating with the turning plate that flips under its own gravity and driven by the drive motor, the carrier rod and the filter plate are lifted, increasing the potential energy of the filter plate. After the filter plate loses the block of the turning plate, it moves downward and collides with the cross plate. The sludge adhering to the surface is shaken off through the collision, which is more direct than the existing cylinder vibration technology, has a larger vibration amplitude, stronger sewage discharge capacity, and completes the separation of a single group among multiple groups of filter plates in the above process. The structure is compact and there is no need to independently arrange gas pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the overall structure of the other side of the present invention;

[0025] Figure 3 For the present invention Figure 1 The enlarged structure schematic diagram at A in it;

[0026] Figure 4 It is a schematic diagram of the structure of the plate pulling mechanism of the present invention;

[0027] Figure 5 It is an exploded structure schematic diagram of the plate pulling mechanism of the present invention;

[0028] Figure 6 It is a schematic diagram of the structure of the filter plate and the carrier rod of the present invention;

[0029] Figure 7 For the present invention Figure 6 The enlarged structure schematic diagram at B in it;

[0030] Figure 8 It is a schematic diagram of the structure of the stator and the rotor of the present invention;

[0031] Figure 9 For the present invention Figure 8 The enlarged structure schematic diagram at C in it;

[0032] Figure 10 This is a schematic structural diagram of the tread plate and the tipping plate of the present invention.

[0033] In the figure: 1, filter press; 10, cross plate; 11, first slide rail; 12, filter plate; 13, bearing rod; 2, draw plate mechanism; 20, slide table; 21, drive motor; 22, drive wheel; 23, transmission belt; 24, auxiliary wheel; 25, driven wheel; 26, mover; 27, stator; 28, first traction wheel; 29, second traction wheel; 30, connecting frame; 31, tread plate; 32, sensor; 33, tipping plate; 34, anti - reverse block; 35, fixing plate; 36, auxiliary groove; 37, auxiliary block; 38, first spring; 40, second slide rail; 41, slider; 42, alignment sleeve; 43, alignment groove; 44, alignment rod; 50, restraint plate; 51, restraint groove; 52, restraint rod; 53, insertion plate; 54, second spring; 55, insertion slot; 56, electromagnet. Specific embodiments

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0035] Please refer to Figure 1-10 , the present invention provides a technical solution: a pressure - filtration type chemical wastewater treatment device, including a filter press 1, with a filter plate 12 built - in the filter press 1. Two groups of cross plates 10 for restricting the filter plate 12 are fixedly connected to both sides of the filter press 1, and the two groups of cross plates 10 are located on both sides of the filter plate 12;

[0036] One side of the filter plate 12 is fixedly connected to a bearing rod 13, and on the same side, there is a draw plate mechanism 2 for assisting the expansion of the filter plate 12 and facilitating the discharge of filter cakes from the filter plate 12;

[0037] The draw plate mechanism 2 is composed of a vertical part and a horizontal part as a whole, and is distributed in an "L" shape. The vertical part is composed of a connecting frame 30 and multiple groups of tread plates 31. By pushing the bearing rod 13 with the tread plates 31, the height of the filter plate 12 is changed to increase potential energy, and the filter plate 12 can also be moved from one side of the draw plate mechanism 2 to the other side. During this period, the potential energy is released, and the sludge discharge capacity is enhanced by the kinetic energy generated by the impact of the filter plate 12. The horizontal part is composed of a first slide rail 11 and a slide table 20. The slide table 20 moves along the slide rail, and drives the filter plate 12 to move through the vertical part to complete the expansion of the filter plate 12.

[0038] Please refer to Figure 1-4, the first slide rail 11 is fixedly connected to the outer surface of the side horizontal plate 10, the sliding table 20 slides on the surface of the first slide rail 11, the pulling plate mechanism 2 further includes a fixing plate 35, one end of the fixing plate 35 is fixedly connected to the connecting frame 30, and the other end is connected to the sliding table 20 through the mover 26 of the linear motor. The upper and lower ends of the connecting frame 30 are respectively rotatably connected to a second traction wheel 29 and a first traction wheel 28 through a rotating shaft. The tread plate 31 is sleeved on the outer surfaces of the first traction wheel 28, the second traction wheel 29 and the connecting frame 30. Both the first traction wheel 28 and the second traction wheel 29 are engaged with a plurality of groups of tread plates 31 to improve the transmission efficiency. The outer surface of the tread plate 31 is rotatably connected to a flap 33 through a rotating shaft. The flap 33 is arranged every other group of tread plates 31. The outer surface of the tread plate 31 is fixedly connected with a reverse stop 34, so that the flap 33 is at a right angle to the tread plate 31 during the rising stage and overlaps with the tread plate 31 during the falling stage. The right angle is beneficial to the transportation of the bearing rod 13, convenient for lifting the filter pressing plate 12 and increasing the potential energy. When the flap 33 is in the descending state, it coincides with the tread plate 31 under its own gravity and the extrusion including the bearing rod 13, and cannot block the bearing rod 13. The filter pressing plate 12 will move downward and impact on the surface of the horizontal plate 10, and the sludge adhered to the surface of the filter pressing plate 12 will be cleaned through the impact. Moreover, during the process of the tread plate 31 rising to falling, a group of filter pressing plates 12 will be turned over the vertical part of the pulling plate mechanism 2. At this time, the pulling plate mechanism 2 slides to the right along the first slide rail 11 through the sliding table 20 ( Figure 1 as a reference) to unfold the filter pressing plate 12. Through the mutual cooperation of the above structures, the pulling plate mechanism 2 plays the functions of enhancing the sewage discharge capacity and unfolding the filter pressing plate 12.

[0039] Please refer to Figure 3-5, a linear motor is provided on the outer surface of the sliding table 20. The linear motor is composed of a mover 26 and a stator 27. The stator 27 is fixedly connected to the sliding table 20, and the mover 26 slides inside the stator 27. The mover 26 is fixedly connected to the other end of the fixing plate 35. The fixing plate 35 is made of a steel structure to bear a large weight and is of an irregular shape as a whole to meet the space requirements, making the overall layout more compact and reasonable. By controlling the mover 26 to slide on the surface of the stator 27, the mover 26 drives the connecting frame 30 to displace through the fixing plate 35, and the lifting height of the filter pressing plate 12 can be changed. It can be selected according to the viscosity of the sludge. When the sludge has strong viscosity, the connecting frame 30 is lifted to increase the lifting height of the filter pressing plate 12, thereby increasing the potential energy and improving the collision force. The filter pressing plate 12 is made of polyvinylidene fluoride material. Although ensuring its own strength will appropriately increase the cost, it extends the service life. When the mover 26 is controlled by the stator 27 to lower the connecting frame 30 to the lowest position, the bearing rod 13 cannot block the vertical part of the pulling plate mechanism 2, and the vertical part of the pulling plate mechanism 2 can be driven by the sliding table 20 to slide on the surface of the first slide rail 11, so as to control the reset of the pulling plate mechanism 2. The entire pulling plate mechanism 2 can be remotely controlled. The remote control method is relatively mature, and the remote control personnel can supervise the instrument on site. A sensor 32 is fixedly connected to the surface of the connecting frame 30 for the user to operate and modify parameters in a timely manner.

[0040] Please refer to Figure 3 , 4 and 10. The check block 34 is designed in a triangular structure. The number of tread plates 31 is several groups, which are connected end to end to form an ellipse. The thickness of the tread plate 31 plus the thickness of the connecting frame 30 is less than the distance between the bearing rods 13 of two groups of filter pressing plates 12, making the structure more stable. The triangular design will not block the falling bearing rod 13 and can effectively support the rising bearing rod 13.

[0041] Please refer to Figure 3-5 , one end of the first traction wheel 28 is fixedly connected to a driven wheel 25. A driving motor 21 is fixedly connected to the surface of the sliding table 20. The output end of the driving motor 21 is fixedly connected to a driving wheel 22. A transmission belt 23 is sleeved between the driving wheel 22 and the driven wheel 25. It is driven to rotate through the transmission belt 23. Different diameters between the driven wheel 25 and the driving wheel 22 can achieve different transmission ratios, and the user can replace them according to needs.

[0042] Please refer to Figure 4 , 5An auxiliary groove 36 is provided on the outer surface of the slide 20, and an auxiliary block 37 is slidably arranged inside the auxiliary groove 36. One end of the auxiliary block 37 is rotatably connected to an auxiliary wheel 24 through a rotating shaft. The auxiliary wheel 24 contacts the inner side of the transmission belt 23. A spring 38 is fixedly connected between the auxiliary block 37 and the auxiliary groove 36. When the height of the connecting frame 30 and the track plate 31 as a whole is changed, the auxiliary wheel 24, the auxiliary block 37, the auxiliary groove 36 and the spring 38 are used to ensure that the transmission belt 23 is always in a taut state, thereby increasing the stability of the structure.

[0043] See also Figure 6 , 7 On the other side, the outer surface of the horizontal plate 10 is fixedly connected with a slide rail 2 40, and a slider 41 slides on the surface of the slide rail 2 40. The upper end of the slider 41 is fixedly connected with an orientation sleeve 42. An orientation groove 43 is provided in the orientation sleeve 42. The orientation groove 43 is an open design, and an orientation rod 44 is telescopically and slidably connected inside. The orientation rod 44 is fixedly connected to the filter press plate 12, and the orientation rod 44 and the orientation sleeve 42 match each other and are rectangular in design to prevent the filter press plate 12 from flipping over and increase stability. The orientation groove 43 is open to prevent the air inside from hindering the descending speed of the filter press plate 12.

[0044] See also Figure 8 , 9 A constraint plate 50 is fixedly connected to one end of the outer surface of the slide 20 that is perpendicular to the mover 26, and an electromagnet 56 is fixedly connected to the lower end of the constraint plate 50. A slot 55 is provided on the outer surface of the mover 26, and a constraint groove 51 is provided on the surface of the constraint plate 50. A constraint rod 52 is slidably connected inside the constraint groove 51, and an insert plate 53 is fixedly connected to one end of the constraint rod 52. The insert plate 53 is inserted into the slot 55, and a spring 54 is fixedly connected between the insert plate 53 and the electromagnet 56. The insert plate 53 is inserted into the slot 55 to limit the height of the mover 26, so that the entire linear motor can be self-locking. When the position of the mover 26 needs to be changed, the electromagnet 56 is energized to magnetically adsorb the insert plate 53, so that the insert plate 53 is separated from the slot 55. The constraint rod 52 and the constraint groove 51 are used to constrain the moving direction of the insert plate 53.

[0045] The plug plate 53 is made of magnetic metal, and the second spring 54 is in a compressed and force-storing state. It is adsorbed when power is turned on, and is pushed into the slot 55 by the second spring 54 after power is turned off. The slots 55 are vertically distributed along the surface of the mover 26.

[0046] (by Figure 1Taking the left and right sides of as a reference), in the initial state, the pull - plate mechanism 2 is on the right side of the cross - plate 10. When it is necessary to clean the filter residue inside the filter - press plate 12, the vertical part of the pull - plate mechanism 2, with the slide - table 20 cooperating with the first slide - rail 11, moves leftward along the cross - plate 10. When the bearing rod 13 on the surface of the filter - press plate 12 contacts the tread plate 31, through the cooperation of structures such as the flap 33 and the check block 34, the filter - press plate 12 is lifted. When the filter - press plate 12 passes over the connecting frame 30, the filter - press plate 12 falls freely, and the filter residue or filter cake is shaken off by the impact. At this time, the pull - plate mechanism 2 can move rightward along the cross - plate 10 under the cooperation of the slide - table 20 and the first slide - rail 11, pushing the cleaned filter - press plate 12 to the rightmost side, or it can continue to move leftward along the first slide - rail 11 to clean the remaining filter - press plates 12. When all the filter - press plates 12 are cleaned, the pull - plate mechanism 2 is at the leftmost side of the cross - plate 10. At this time, the height of the mover 26 is controlled by the stator 27, and the connecting frame 30 is lowered until it no longer blocks the bearing rod 13. Finally, the vertical part of the pull - plate mechanism 2 is driven by the slide - table 20 to slide rightward along the first slide - rail 11 to reset. Through the mutual cooperation of the stator 27 and the mover 26 of the linear motor, the pull - plate mechanism 2 has a high degree of freedom.

[0047] A pressure - filtration chemical wastewater treatment method includes the following steps;

[0048] S1. The filter - press 1 compresses the filter - press plate 12, fills wastewater into the filter - press plate 12, and performs solid - liquid separation through the filter - press plate 12. After reaching the preset filtration time, the filtration stage is basically completed;

[0049] S2. The filter - press 1 loosens the compressed filter - press plate 12, and the pull - plate mechanism 2 is driven by the slide - table 20 to drive the filter - press plate 12 to unfold, discharging the sludge in the middle of the filter - press plate 12;

[0050] S3. The driving motor 21 drives the first traction wheel 28 to rotate, the first traction wheel 28 drives the tread plate 31 to rotate, the flap 33 pushes the filter - press plate 12 to move upward, and the filter - press plate 12 passes over the vertical part of the pull - plate mechanism 2. Under the action of gravity, the filter - press plate 12 impacts the cross - plate 10, facilitating the shaking off of the sludge adhering to the surface of the filter - press plate 12. The pull - plate mechanism 2 is driven horizontally by the slide - table 20 to push the filter - press plate 12 that has discharged the sludge to the right (taking Figure 1 as a reference), and the unfolding is completed.

[0051] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, such that a process, method, article or apparatus comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or apparatus.

[0052] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pressure filtration type chemical wastewater treatment device, including a filter press (1), on both sides of the filter press (1) are fixedly connected with cross plates (10) that restrain the filter plates (12), and the number of the cross plates (10) is two groups, located on both sides of the filter plates (12); It is characterized in that: On one side of the filter plate (12) is fixedly connected with a bearing rod (13), and on the same side is provided with a pulling plate mechanism (2) that assists the filter plate (12) to unfold and facilitates the discharge of filter cakes from the filter plate (12); The pulling plate mechanism (2) as a whole consists of a vertical part and a horizontal part, and is distributed in an "L" shape. The vertical part is composed of a connecting frame (30) and multiple sets of tread plates (31), and the horizontal part is composed of a first slide rail (11) and a sliding table (20); The first slide rail (11) is fixedly connected to the outer surface of one side cross plate (10), the sliding table (20) slides on the surface of the first slide rail (11), and the pulling plate mechanism (2) further includes a fixing plate (35). One end of the fixing plate (35) is fixedly connected with the connecting frame (30), and the other end is connected with the sliding table (20). The upper and lower ends of the connecting frame (30) are respectively rotatably connected with a second traction wheel (29) and a first traction wheel (28) through rotating shafts. The tread plates (31) are sleeved on the outer surfaces of the first traction wheel (28), the second traction wheel (29), and the connecting frame (30). The outer surface of the tread plate (31) is rotatably connected with a flap (33) through a rotating shaft, and a non-return block (34) is fixedly connected to the outer surface of the tread plate (31); The non-return block (34) is designed in a triangular structure, and the number of the tread plates (31) is several groups, connected end to end to form an ellipse; On the outer surface of the sliding table (20) is provided with a linear motor, which consists of a mover (26) and a stator (27). The stator (27) is fixedly connected with the sliding table (20), and the mover (26) slides inside the stator (27), and the mover (26) is fixedly connected with the other end of the fixing plate (35); One end of the first traction wheel (28) is fixedly connected with a driven wheel (25). On the surface of the sliding table (20) is fixedly connected with a driving motor (21), and the output end of the driving motor (21) is fixedly connected with a driving wheel (22). A transmission belt (23) is sleeved between the driving wheel (22) and the driven wheel (25); On the outer surface of the sliding table (20) is opened with an auxiliary groove (36). Inside the auxiliary groove (36) slides an auxiliary block (37). One end of the auxiliary block (37) is rotatably connected with an auxiliary wheel (24) through a rotating shaft, and the auxiliary wheel (24) is in contact with the inner side of the transmission belt (23). A first spring (38) is fixedly connected between the auxiliary block (37) and the auxiliary groove (36).

2. The pressure filtration type chemical wastewater treatment device according to claim 1, wherein: On the outer surface of the other side cross plate (10) is fixedly connected with a second slide rail (40). On the surface of the second slide rail (40) slides a slider (41). The upper end of the slider (41) is fixedly connected with an alignment sleeve (42). Inside the alignment sleeve (42) is opened with an alignment groove (43). The alignment groove (43) is open, and inside it telescopically and slidably connects an alignment rod (44), and the alignment rod (44) is fixedly connected with the filter plate (12).

3. The pressure filtration type chemical wastewater treatment device according to claim 2, characterized in that: A constraint plate (50) is fixedly connected to one end of the outer surface of the slide (20) which is perpendicular to the mover (26), and an electromagnet (56) is fixedly connected to the lower end of the constraint plate (50). A slot (55) is provided on the outer surface of the mover (26), and a constraint groove (51) is provided on the surface of the constraint plate (50). A constraint rod (52) is slidably connected inside the constraint groove (51), and an insert plate (53) is fixedly connected to one end of the constraint rod (52). The insert plate (53) is inserted into the slot (55), and a second spring (54) is fixedly connected between the insert plate (53) and the electromagnet (56).

4. The pressure filtration type chemical wastewater treatment device according to claim 3, characterized in that: The plug plate (53) is made of magnetic metal, and the second spring (54) is in a compressed force storage state.

5. A method for treating chemical wastewater using the pressure filtration type chemical wastewater treatment device according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: S1, the filter press (1) presses the filter press plate (12), pours wastewater into the filter press plate (12), and performs solid-liquid separation through the filter press plate (12). After a preset filtering time is reached, the filtering stage is basically completed; S2, the filter press (1) releases the compressed filter plate (12), and the plate pulling mechanism (2) is driven by the slide (20) to drive the filter plate (12) to unfold, thereby discharging the sludge in the middle of the filter plate (12); S3. The traction wheel 1 (28) is driven to rotate by the driving motor (21), and the traction wheel 1 (28) drives the track plate (31) to rotate, and the filter press plate (12) is pushed upward by the flip plate (33) and flipped over the vertical part of the pull plate mechanism (2). Under the action of gravity, the filter press plate (12) hits the horizontal plate (10), so that the sludge adhering to the surface of the filter press plate (12) can be shaken off.

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