Recovery treatment device for m-toluic acid production wastewater

Abstract

The invention belongs to the field of wastewater treatment equipment, and particularly relates to an m-toluic acid production wastewater recovery treatment device which comprises an outer tank body device, the outer tank body device comprises an outer tank body, the lower end of the outer tank body is fixedly connected with a sealing bottom plate, an upper bridge frame is arranged at the upper end of the outer tank body, and a lower bridge frame is arranged at the lower end of the outer tank body; a filter cylinder device with the same central axis is fixedly installed in the outer tank body and comprises a filter cylinder, a first pressing plate device and an upper sealing plate device are slidably connected in the filter cylinder, the upper sealing plate device is slidably connected with the upper bridge frame, a second pressing plate device and a lower sealing plate device are slidably connected to the outer wall of the filter cylinder, and the lower sealing plate device is connected with a sealing bottom plate. The vertical downward first screw rod devices are symmetrically arranged on the upper bridge frame, the symmetrical vertical downward second screw rod devices are arranged between the two first screw rod devices, the device can carry out solid-liquid filtering treatment twice in one treatment period, meanwhile, the filtering treatment devices are cleaned, solid substances are automatically discharged, and the treatment efficiency is greatly improved.

Description

Technical Field

[0001] The invention belongs to the field of wastewater treatment equipment, and in particular relates to a recycling and treatment device for m-toluic acid production wastewater. Background Art

[0002] Methylbenzoic acid is an organic compound in the form of white or light yellow crystalline powder with multiple isomers, the most common of which are p-methylbenzoic acid and m-methylbenzoic acid. It is widely used in the production of organic substances such as medicines, photosensitive materials, pesticides, pigments, and fragrances. A large amount of wastewater is generated during the production of m-methylbenzoic acid, and these wastewaters contain organic substances such as raw materials, incompletely reacted substances, and finished products, which need to be treated and recycled.

[0003] A Chinese patent application with application number CN202220941587.6 discloses a solid-liquid separation and treatment device for the production and purification of m-toluic acid waste, comprising a main body, one side of which is fixedly connected to a feed pipe, and a separation box is installed inside the main body; a screen drum is rotatably connected inside the separation box, a discharge port is fixedly connected below the screen drum, a receiving groove is provided inside the discharge port, two gate plates are rotatably connected inside the receiving groove, and driven teeth are rotatably connected on both sides of the two gate plates. After a certain amount of solid waste separated by the utility model accumulates inside the screen drum, the driven teeth meshing therewith are driven to rotate under the action of the active teeth, so that the two gate plates rotate and finally return to the inside of the receiving groove, and the solid waste is discharged along the discharge port. The structural principle is simple and the operation is convenient. The material can be discharged directly at one time during discharge without manual intervention. However, during the solid-liquid separation process of the device, although the rotation of the screen drum can improve the filtration efficiency and help the liquid pass through the screen drum, it will also cause solid matter to adhere to the inner wall of the screen drum. Due to the lack of a device for timely cleaning and discharge, the treatment effect and equipment working efficiency are affected. In addition, the screen drum can only filter once, further affecting the filtration treatment effect. Summary of the invention

[0004] The purpose of the present invention is to provide a recycling and treatment device for m-toluic acid production wastewater in view of the shortcomings of the prior art. A new type of filtration treatment device is set up, which can perform two solid-liquid filtration treatments in one treatment cycle, and at the same time clean the filtration treatment device, and the solid matter is automatically discharged, which greatly improves the treatment efficiency, thereby effectively solving the problems existing in the prior art.

[0005] To achieve the above purpose, the specific technical solutions of the present invention are as follows: A recycling and treatment device for wastewater produced by m-methylbenzoic acid, comprising an outer tank device, the outer tank device comprising an outer tank, a sealing bottom plate fixedly connected to the lower end of the outer tank, mounting platforms symmetrically fixedly connected to the two sides of the outer tank, an upper bridge frame provided at the upper end of the mounting platform, a lower bridge frame provided at the lower end of the mounting platform, a filter cartridge device with the same central axis fixedly installed in the outer tank, the filter cartridge device comprising a filter cartridge, a partition plate fixedly connected to the upper end of the outer wall of the filter cartridge, an outer edge of the partition plate sealedly connected to the inner wall of the outer tank, a first pressing plate device and an upper sealing plate device slidably connected in the filter cartridge, and the upper sealing plate device The plate device is slidably connected to the upper bridge frame, and a second pressure plate device and a lower sealing plate device are slidably connected on the outer wall of the filter cartridge. The lower sealing plate device is connected to the sealing bottom plate. A first vertically downward screw device is symmetrically arranged on the upper bridge frame, and a symmetrical vertically downward second screw device is arranged between the two first screw devices. The first screw device is transmission-connected to the second pressure plate device, and the first screw device is slidingly and sealingly connected to the lower sealing plate device. The second screw device is transmission-connected to the first pressure plate device, and the second screw device is slidingly and sealingly connected to the upper sealing plate device.

[0006] As a further arrangement of the above scheme, an upper mounting groove is opened at the center of the upper bridge frame, a lower mounting groove is opened at the center of the lower bridge frame, a through hole is opened at the center of the sealing bottom plate, a wastewater pump device is provided on the sealing bottom plate, a water outlet is opened on the sealing bottom plate, the water outlet is connected to the filter cartridge, and a second sewage discharge device is provided at the lower end of the mounting platform, and the second sewage discharge device is connected to the outer tank body.

[0007] As a further configuration of the above scheme, the first screw device includes a first rotating shaft rod, a first driving thread is opened on the first rotating shaft rod, the upper end of the first rotating shaft rod is rotatably connected to the upper bridge frame, the lower end of the first rotating shaft rod is rotatably connected to the sealing bottom plate, and the upper end of the first rotating shaft rod is connected to a first motor; the second screw device includes a second rotating shaft rod, a second driving thread is opened on the second rotating shaft rod, the upper end of the second rotating shaft rod is rotatably connected to the upper bridge frame, the lower end of the second rotating shaft rod is rotatably connected to the sealing bottom plate, and the upper end of the second rotating shaft rod is connected to a second motor.

[0008] As a further configuration of the above scheme, the wastewater pump device includes a water pump, which is fixedly mounted on the lower bridge frame. The water pump is provided with an inlet pipe and an outlet pipe. The outlet pipe passes vertically upward through the through hole, and the outlet pipe is sealed and connected to the through hole.

[0009] As a further arrangement of the above scheme, the filter cartridge is provided with evenly distributed filter holes, the partition is symmetrically provided with guide holes, the lower end of the guide holes is provided with a sinking groove, the guide holes are rotatably sealed with the first rotating shaft rod, and the upper end of the filter cartridge is provided with a first sewage discharge device, which is located above the partition.

[0010] As a further configuration of the above scheme, the first pressure plate device includes a first circular pressure plate, on which a first screw hole device is symmetrically provided, the first screw hole device is transmission-connected to the second driving thread, a connecting platform is opened at the center of the lower end surface of the first circular pressure plate, and a one-way valve device is provided at the center of the connecting platform.

[0011] As a further configuration of the above scheme, the upper sealing plate device includes an upper sealing circular plate, a symmetrical first through groove is opened on the upper sealing circular plate, the first through groove is slidingly and sealingly connected to the second rotating shaft rod, a vertically upward guide column is provided at the center of the upper end surface of the upper sealing circular plate, a limit plate is provided at the upper end of the guide column, the guide column is slidingly connected to the upper mounting groove, a first reset spring is provided on the guide column, and the first reset spring is located between the upper bridge frame and the upper sealing circular plate.

[0012] As a further configuration of the above scheme, the second pressure plate device includes a second annular pressure plate, the inner wall of the second annular pressure plate is slidably connected to the outer wall of the filter cartridge, the outer wall of the second annular pressure plate is slidably and sealingly connected to the inner wall of the outer tank body, and a symmetrical second screw hole device is provided on the second annular pressure plate, and the second screw hole device is transmission connected to the first drive thread.

[0013] As a further configuration of the above scheme, the lower sealing plate device includes a lower circular sealing plate, the inner wall of the lower circular sealing plate is slidingly and sealingly connected to the outer wall of the filter cartridge, the outer wall of the lower circular sealing plate is slidingly and sealingly connected to the inner wall of the outer tank body, a symmetrical second through groove is opened on the lower circular sealing plate, the second through groove is slidingly and sealingly connected to the first rotating shaft rod, the lower end of the second through groove is connected to a second return spring, and the lower end of the second return spring is fixedly connected to the sealing bottom plate.

[0014] Beneficial effects of the present invention: The second screw device drives the first pressure plate device to move downward, the connecting platform is connected to the water outlet pipe, the one-way valve device is opened, and the water pump adds wastewater to the filter cartridge through the water inlet pipe and the water outlet pipe. The wastewater enters the outer tank body after preliminary filtration through the filter hole. When the filter cartridge and the outer tank body are full, the second screw device drives the first pressure plate device to move upward, and the wastewater enters the outer tank body from the filter cartridge after being pressurized to complete the preliminary filtration. At the same time, the wastewater in the outer tank body enters the filter cartridge for the second filtration. The second screw device drives the first pressure plate device to move downward. When the first pressure plate device is aligned with the second pressure plate device, the first screw device drives the second pressure plate device to move downward synchronously, and the wastewater is discharged from the outer tank body and the filter cartridge from the water outlet to complete the second filtration. Two solid-liquid filtration treatments are performed in one treatment cycle, which greatly improves the treatment efficiency.

[0015] During the ascending process of the first pressure plate device, the inner wall of the filter cartridge is cleaned and the solid waste trapped in the filter cartridge is lifted upward. After the first pressure plate device staggers the filter holes upward, the wastewater containing solid waste is pressed to drive the upper sealing circular plate to move upward, and cooperates with the first return spring to automatically discharge the wastewater containing solid waste from the first sewage discharge device; during the downward movement of the second pressure plate device, the outer wall of the filter cartridge and the inner wall of the outer tank body are cleaned, and the solid waste trapped outside the filter cartridge is pushed downward. After the second pressure plate device staggers the filter holes upward, the wastewater containing solid waste is pressed to drive the lower circular sealing plate to move downward, and cooperates with the second return spring to automatically discharge the wastewater containing solid waste from the second sewage discharge device, thereby further improving the working efficiency of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a first cross-sectional schematic diagram of the present invention; Figure 2 It is a schematic diagram of the appearance of the present invention; Figure 3 is a second cross-sectional schematic diagram of the present invention; Figure 4 It is a cross-sectional schematic diagram of the outer tank device of the present invention; Figure 5 It is a cross-sectional schematic diagram of the filter cartridge device of the present invention; Figure 6 It is a schematic diagram of the assembly of the filter cartridge device, the upper sealing plate device, the second pressing plate device and the lower sealing plate of the present invention; Figure 7 It is a schematic diagram of the first pressing plate device and the lower sealing plate device of the present invention; Figure 8 It is a schematic diagram of the upper sealing plate device and the second pressing plate device of the present invention.

[0017] Outer tank device; 2, filter cartridge device; 3, first screw device; 4, second screw device; 5, wastewater pump device; 6, first pressure plate device; 7, upper sealing plate device; 8, second pressure plate device; 9, lower sealing plate device; 101, outer tank; 102, mounting platform; 103, upper bridge frame; 1031, upper mounting groove; 104, lower bridge frame; 1041, lower mounting groove; 105, sealing bottom plate; 1051, through hole; 1052, water outlet; 106, second sewage discharge device; 201, filter cartridge; 202, filter hole; 203, partition; 204, guide hole; 2041, trough; 205, first sewage discharge device; 301, first A rotating shaft rod; 302, a first driving thread; 303, a first motor; 401, a second rotating shaft rod; 402, a second driving thread; 403, a second motor; 501, a water pump; 502, a water inlet pipe; 503, a water outlet pipe; 601, a first circular pressure plate; 602, a first screw hole device; 603, a connecting platform; 604, a one-way valve device; 701, an upper sealing circular plate; 702, a first through groove; 703, a guide column; 7031, a limit plate; 704, a first return spring; 801, a second circular pressure plate; 802, a second screw hole device; 901, a lower circular sealing plate; 902, a second through groove; 903, a second return spring. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0019] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Figures 1 to 8 The present application is described in detail with reference to embodiments.

[0020] The present embodiment discloses a recycling and treatment device for m-toluic acid production wastewater, wherein the outer tank body device 1 comprises an outer tank body 101, a sealing bottom plate 105 is fixedly connected to the lower end of the outer tank body 101, mounting platforms 102 are symmetrically fixedly connected to the two sides of the outer tank body 101, an upper bridge frame 103 is provided at the upper end of the mounting platform 102, a lower bridge frame 104 is provided at the lower end of the mounting platform 102, a filter cartridge device 2 having the same central axis is fixedly installed in the outer tank body 101, the filter cartridge device 2 comprises a filter cartridge 201, a partition plate 203 is fixedly connected to the upper end of the outer wall of the filter cartridge 201, the outer edge of the partition plate 203 is sealed and connected to the inner wall of the outer tank body 101, and a first pressing plate device is slidably connected in the filter cartridge 201 6 and an upper sealing plate device 7, the upper sealing plate device 7 is slidably connected to the upper bridge frame 103, the second pressure plate device 8 and the lower sealing plate device 9 are slidably connected on the outer wall of the filter cartridge 201, the lower sealing plate device 9 is connected to the sealing bottom plate 105, and the upper bridge frame 103 is symmetrically provided with a vertically downward first screw device 3, and a symmetrical vertically downward second screw device 4 is provided between the two first screw devices 3, the first screw device 3 is transmission-connected to the second pressure plate device 8, the first screw device 3 is slidingly and sealingly connected to the lower sealing plate device 9, the second screw device 4 is transmission-connected to the first pressure plate device 6, and the second screw device 4 is slidingly and sealingly connected to the upper sealing plate device 7.

[0021] like Figure 4 As shown, an upper mounting groove 1031 is opened at the center of the upper bridge frame 103, a lower mounting groove 1041 is opened at the center of the lower bridge frame 104, a through hole 1051 is opened at the center of the sealing bottom plate 105, a wastewater pump device 5 is provided on the sealing bottom plate 105, a water outlet 1052 is opened on the sealing bottom plate 105, the water outlet 1052 is connected with the filter cartridge 201, a second sewage discharge device 106 is provided at the lower end of the mounting platform 102, and the second sewage discharge device 106 is connected with the outer tank body 101; the wastewater pump device 5 includes a water pump 501, the water pump is fixedly mounted on the lower bridge frame 104, a water inlet pipe 502 and a water outlet pipe 503 are provided on the water pump 501, the water outlet pipe 503 vertically passes through the through hole 1051 upward, and the water outlet pipe 503 is sealed and connected with the through hole 1051.

[0022] The first screw device 3 includes a first rotating shaft rod 301, a first driving thread 302 is opened on the first rotating shaft rod 301, the upper end of the first rotating shaft rod 301 is rotatably connected to the upper bridge frame 103, the lower end of the first rotating shaft rod 301 is rotatably connected to the sealing bottom plate 105, and the upper end of the first rotating shaft rod 301 is connected to the first motor 303, and the second screw device 4 includes a second rotating shaft rod 401, a second driving thread 402 is opened on the second rotating shaft rod 401, the upper end of the second rotating shaft rod 401 is rotatably connected to the upper bridge frame 103, the lower end of the second rotating shaft rod 401 is rotatably connected to the sealing bottom plate 105, and the upper end of the second rotating shaft rod 401 is connected to the second motor 403.

[0023] like Figure 5As shown, the filter cartridge 201 is provided with evenly distributed filter holes 202, the partition plate 203 is symmetrically provided with guide holes 204, the lower end of the guide holes 204 is provided with a sink 2041, the guide holes 204 are rotatably sealed and connected to the first rotating shaft rod 301, and the upper end of the filter cartridge 201 is provided with a first sewage discharge device 205, and the first sewage discharge device 205 is located above the partition plate 203.

[0024] like Figure 6 , Figure 7 As shown, the first pressure plate device 6 includes a first circular pressure plate 601, on which a first screw hole device 602 is symmetrically provided, the first screw hole device 602 is transmission-connected to the second driving thread 402, a connecting platform 603 is provided at the center of the lower end surface of the first circular pressure plate 601, a one-way valve device 604 is provided at the center of the connecting platform 603, and a lower sealing plate device 9 includes a lower circular sealing plate 901, the inner wall of the lower circular sealing plate 901 is slidingly and sealingly connected to the outer wall of the filter cartridge 201, the outer wall of the lower circular sealing plate 901 is slidingly and sealingly connected to the inner wall of the outer tank body 101, a symmetrical second through groove 902 is provided on the lower circular sealing plate 901, the second through groove 902 is slidingly and sealingly connected to the first rotating shaft rod 301, the lower end of the second through groove 902 is connected to a second reset spring 903, and the lower end of the second reset spring 903 is fixedly connected to the sealing bottom plate 105.

[0025] like Figure 6 , Figure 8 As shown, the upper sealing plate device 7 includes an upper sealing circular plate 701, on which a symmetrical first through groove 702 is opened, and the first through groove 702 is slidingly and sealingly connected to the second rotating shaft rod 401, and a vertically upward guide column 703 is provided at the center of the upper end surface of the upper sealing circular plate 701, and a limit plate 7031 is provided at the upper end of the guide column 703, and the guide column 703 is slidingly connected to the upper mounting groove 1031, and a first reset spring 704 is sleeved on the guide column 703, and the first reset spring 704 is located between the upper bridge frame 103 and the upper sealing circular plate 701, and the second pressure plate device 8 includes a second annular pressure plate 801, and the inner wall of the second annular pressure plate 801 is slidingly connected to the outer wall of the filter cartridge 201, and the outer wall of the second annular pressure plate 801 is slidingly and sealingly connected to the inner wall of the outer tank body 101, and a symmetrical second screw hole device 802 is provided on the second annular pressure plate 801, and the second screw hole device 802 is drivingly connected to the first driving thread 302.

[0026] Working process: The second screw device 4 drives the first pressing plate device 6 to move downward, the connecting platform 603 is connected to the outlet pipe 503, the one-way valve device 604 is opened, and the water pump 501 adds wastewater to the filter cartridge 201 through the water inlet pipe 502 and the outlet pipe 503. The wastewater enters the outer tank body 101 and the outside of the filter cartridge 201 after preliminary filtration through the filter hole 202. When the filter cartridge 201 and the outer tank body 101 are filled, the second screw device 4 drives the first pressing plate device 6 to move upward, and the wastewater enters the outer tank from the filter cartridge 201 under pressure. The first pressure plate device 6 moves upward away from the filter hole 202, and the wastewater containing the solid waste is pressed and drives the upper sealing circular plate 701 to move upward, and cooperates with the first return spring 704 to automatically discharge the wastewater containing the solid waste from the first sewage discharge device 205.

[0027] The second screw device 4 drives the first pressure plate device 6 to move downward. When the first pressure plate device 6 is aligned with the second pressure plate device 8, the first screw device 3 drives the second pressure plate device 8 to move downward synchronously, and the wastewater is discharged from the outer tank body 101 and the filter cartridge 201 from the water outlet 1052 to complete the second filtration. During the downward movement of the second pressure plate device 8, the outer wall of the filter cartridge 201 and the inner wall of the outer tank body 101 are cleaned, and the solid waste trapped outside the filter cartridge 201 is pushed downward. After the second pressure plate device 8 is offset upward from the filter hole 202, the wastewater containing solid waste is pressed to drive the lower annular sealing plate 9 to move downward, and cooperate with the second return spring 903 to automatically discharge the wastewater containing solid waste from the second sewage discharge device 106.

[0028] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0029] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A recycling and treatment device for m-toluic acid production wastewater, comprising an outer tank device, wherein the outer tank device comprises an outer tank body, characterized in that: The lower end of the outer tank body is fixedly connected to a sealing bottom plate, and both sides of the outer tank body are symmetrically fixedly connected with a mounting platform, an upper bridge frame is provided on the upper end of the mounting platform, and a lower bridge frame is provided at the lower end of the mounting platform. A filter cartridge device with the same central axis is fixedly installed in the outer tank body, the filter cartridge device comprises a filter cartridge, the upper end of the outer wall of the filter cartridge is fixedly connected with a partition, the outer edge of the partition is sealed and connected to the inner wall of the outer tank body. A first pressure plate device and an upper sealing plate device are slidably connected in the filter cartridge, the upper sealing plate device is slidably connected to the upper bridge frame, a second pressure plate device and a lower sealing plate device are slidably connected on the outer wall of the filter cartridge, and the lower sealing plate device is connected to the sealing bottom plate, a first screw device is symmetrically arranged vertically downward on the upper bridge frame, and a symmetrical second screw device is symmetrically arranged vertically downward between the two first screw devices, the first screw device is transmission connected to the second pressure plate device, the first screw device is slidingly and sealingly connected to the lower sealing plate device, the second screw device is transmission connected to the first pressure plate device, and the second screw device is slidingly and sealingly connected to the upper sealing plate device.

2. The m-toluic acid production wastewater recovery and treatment device according to claim 1, characterized in that: An upper mounting groove is opened at the center of the upper bridge frame, a lower mounting groove is opened at the center of the lower bridge frame, a through hole is opened at the center of the sealing bottom plate, a wastewater pump device is arranged on the sealing bottom plate, a water outlet is opened on the sealing bottom plate, the water outlet is connected with the filter cartridge, and a second sewage discharge device is arranged at the lower end of the mounting platform, and the second sewage discharge device is connected with the outer tank body.

3. The m-toluic acid production wastewater recovery and treatment device according to claim 2, characterized in that: The first screw device includes a first rotating shaft rod, a first driving thread is opened on the first rotating shaft rod, the upper end of the first rotating shaft rod is rotatably connected to the upper bridge frame, the lower end of the first rotating shaft rod is rotatably connected to the sealing bottom plate, and the upper end of the first rotating shaft rod is connected to a first motor. The second screw device includes a second rotating shaft rod, a second driving thread is opened on the second rotating shaft rod, the upper end of the second rotating shaft rod is rotatably connected to the upper bridge frame, the lower end of the second rotating shaft rod is rotatably connected to the sealing bottom plate, and the upper end of the second rotating shaft rod is connected to a second motor.

4. The m-toluic acid production wastewater recovery and treatment device according to claim 2, characterized in that: The wastewater pump device comprises a water pump, which is fixedly mounted on the lower bridge frame. The water pump is provided with a water inlet pipe and a water outlet pipe. The water outlet pipe passes vertically upward through the through hole, and the water outlet pipe is sealed and connected to the through hole.

5. The m-toluic acid production wastewater recovery and treatment device according to claim 3, characterized in that: The filter cartridge is provided with evenly distributed filter holes, the partition is symmetrically provided with guide holes, the lower ends of the guide holes are provided with sinking grooves, the guide holes are rotatably sealed with the first rotating shaft rod, the upper end of the filter cartridge is provided with a first sewage discharge device, and the first sewage discharge device is located above the partition.

6. The m-toluic acid production wastewater recovery and treatment device according to claim 3, characterized in that: The first pressure plate device includes a first circular pressure plate, on which a first screw hole device is symmetrically provided, the first screw hole device is transmission-connected to a second driving thread, a connecting platform is provided at the center of the lower end surface of the first circular pressure plate, and a one-way valve device is provided at the center of the connecting platform.

7. The m-toluic acid production wastewater recovery and treatment device according to claim 3, characterized in that: The upper sealing plate device includes an upper sealing circular plate, a symmetrical first through groove is opened on the upper sealing circular plate, the first through groove is slidingly and sealingly connected to the second rotating shaft rod, a vertically upward guide column is provided at the center of the upper end surface of the upper sealing circular plate, a limit plate is provided at the upper end of the guide column, the guide column is slidingly connected to the upper mounting groove, a first reset spring is sleeved on the guide column, and the first reset spring is located between the upper bridge frame and the upper sealing circular plate.

8. The m-toluic acid production wastewater recovery and treatment device according to claim 3, characterized in that: The second pressure plate device includes a second annular pressure plate, the inner wall of the second annular pressure plate is slidably connected to the outer wall of the filter cartridge, the outer wall of the second annular pressure plate is slidably and sealingly connected to the inner wall of the outer tank body, and a symmetrical second screw hole device is provided on the second annular pressure plate, and the second screw hole device is transmission-connected to the first drive thread.

9. The m-toluic acid production wastewater recovery and treatment device according to claim 3, characterized in that: The lower sealing plate device includes a lower circular sealing plate, the inner wall of the lower circular sealing plate is slidingly and sealingly connected to the outer wall of the filter cartridge, the outer wall of the lower circular sealing plate is slidingly and sealingly connected to the inner wall of the outer tank body, a symmetrical second through groove is opened on the lower circular sealing plate, the second through groove is slidingly and sealingly connected to the first rotating shaft rod, the lower end of the second through groove is connected to a second return spring, and the lower end of the second return spring is fixedly connected to the sealing bottom plate.

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