Sewage separation and purification device for pesticide production

Abstract

The invention relates to the technical field of wastewater treatment, in particular to a sewage separation and purification device for pesticide production, which comprises a first plate body and a second plate body which are arranged in a tank body, a filter opening is formed in the first plate body, and a filter screen is arranged at the filter opening; a through hole is formed in the second plate body; the top of the second plate body is provided with a ring body, the ring body forms a cavity and is located under the filtering opening, the sewage separation and purification device further comprises an extrusion control mechanism, and the extrusion control mechanism controls the filtering net to move towards the bottom end of the ring body. Then the control mechanism is extruded to drive the filter screen to descend, the filter screen moves towards the bottom end of the ring body, and the fluid in the cavity penetrates through the filter screen to separate blockages on the filter screen, so that the filter screen is cleaned in the wastewater treatment and purification process, and the working efficiency of wastewater separation and purification is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, in particular to a wastewater separation and purification device for pesticide production. Background Art

[0002] The wastewater generated during the pesticide production process contains a large amount of organic matter, chemicals, and possible heavy metals and other pollutants. If these wastewaters are discharged directly into the environment, they will cause serious pollution to the surrounding water and soil, affecting the health and stability of the ecosystem.

[0003] Chinese Patent: CN202122193579.6 discloses a wastewater treatment device for pesticide production. The agent and wastewater in the tank are mixed by a stirring blade, and finally the wastewater is filtered through a filter. However, the filter will inevitably become clogged during long-term use, thereby affecting the filtration of the wastewater and causing a slow separation and purification process.

[0004] Chinese Patent: CN202321101498.1 discloses a filtering and impurity removal device for insecticide production, which solves the problem in the prior art that when the filtering structure is not cleaned in time, it will directly affect the filtering quality, which will not only cause blockage and reduce the filtering efficiency, but also reduce the filtering quality. However, this filtering and impurity removal device is an isolated structure and cannot be combined with the tank body.

[0005] Aiming at the problem that the filter screen in the tank cannot be effectively cleaned during the wastewater treatment and purification process in the pesticide production process, thus affecting the wastewater separation and purification efficiency, a wastewater separation and purification device for pesticide production is proposed to solve the problem. Summary of the invention

[0006] In view of this, the purpose of the present invention is to propose a wastewater separation and purification device for pesticide production, so as to solve the technical problem that the filter screen in the tank body cannot be effectively cleaned during the wastewater treatment and purification process in the pesticide production process, thereby affecting the wastewater separation and purification efficiency.

[0007] Based on the above purpose, the present invention provides a sewage separation and purification device for pesticide production, comprising a tank body, a water inlet pipe and a water outlet pipe are respectively arranged above and below the tank body, a stirring paddle is arranged inside the tank body, a first rotary driver for controlling the rotation of the stirring paddle is arranged outside the tank body, and a feeding device connected to the inside of the tank body is arranged outside the tank body; the sewage separation and purification device also includes a first plate body and a second plate body arranged inside the tank body from top to bottom, a gap is formed between the first plate body and the second plate body, and the first plate body and the second plate body are both located below the stirring paddle; The first plate body is provided with a filter port, and a filter screen is arranged at the filter port; The second plate is provided with a through opening, and the upper part of the tank body is connected with the water outlet pipe through the filter screen and the through opening; A ring body is arranged on the top of the second plate body, the ring body forms a chamber and the ring body is directly below the filter port. The sewage separation and purification device also includes an extrusion control mechanism, which controls the filter screen to move toward the bottom end of the ring body. The fluid in the chamber will pass through the filter screen to remove the blockage on the filter screen.

[0008] Preferably, a baffle is provided inside the ring body, and the baffle is slidably and sealingly connected to the inner wall of the ring body, and the extrusion control mechanism is also used to drive the baffle to move along the axial direction of the ring body.

[0009] Preferably, the extrusion control mechanism includes a connecting rod passing through the first plate body and the second plate body, and the connecting rod is provided with a first pressure plate and a second pressure plate, the first pressure plate is located above the first plate body, and the second pressure plate is located below the second plate body, the second pressure plate is transmission-connected to the filter screen and the baffle, and the bottom of the tank body is provided with a linear drive for controlling the longitudinal movement of the connecting rod.

[0010] Preferably, the connecting rod is slidably connected to the first pressure plate, a first sealing plate corresponding to the filter port is arranged on the first pressure plate, a first baffle ring is arranged on the connecting rod and the first pressure plate is located above the first baffle ring, a first limit plate is arranged on the top of the connecting rod, a first elastic element is arranged on the first limit plate, and the first elastic element pushes the first pressure plate to contact the first baffle ring.

[0011] Preferably, the baffle includes a second sealing plate with a sliding seal arranged inside the ring body, a cylinder is penetrated on the second sealing plate, the bottom end of the cylinder passes through the second plate body and the second pressure plate in sequence, a second baffle ring is arranged on the cylinder, the second baffle ring is located between the second plate body and the second pressure plate, a second limit plate is arranged at the bottom end of the cylinder, a second elastic element is arranged on the second limit plate, and the second elastic element pushes the second pressure plate to contact the second baffle ring.

[0012] Preferably, the filter screen includes a frame and a mesh body arranged on the frame, a connecting rod penetrating the cylinder is arranged at the bottom of the frame, and the connecting rod is slidably and sealingly connected to the cylinder; The bottom end of the connecting rod is provided with a top rod facing the bottom surface of the second pressing plate; A sliding member is arranged below the connecting rod, and the sliding member is circumferentially slidably connected to the inner wall of the tank body. A limiting rod is arranged on the sliding member, and the limiting rod passes through the bottom end of the connecting rod and is slidably connected thereto. A third elastic element is also arranged on the sliding member for pushing the connecting rod to move upward.

[0013] Preferably, the sewage separation and purification device further comprises a third sealing plate, the third sealing plate is located between the first plate body and the second plate body, and the third sealing plate corresponds to the position of the through port; A column is arranged at the bottom of the third sealing plate, and the column passes through the through opening and the second pressure plate in sequence. A third baffle ring is arranged on the column and is located above the second pressure plate. A third limiting plate is arranged at the bottom end of the column, and a fourth elastic element is arranged on the third limiting plate. The fourth elastic element is used to push the second pressure plate to resist the third baffle ring.

[0014] Preferably, the tank body is symmetrically provided with a liquid inlet and a liquid outlet, and both the liquid inlet and the liquid outlet are located between the first plate body and the second plate body.

[0015] Preferably, the first plate body and the second plate body are both rotatably connected to the inner wall of the tank body; The first pressing plate, the first plate body and the second plate body are all fixedly provided with a first spline sleeve, and the connecting rod is slidably connected with the first spline sleeves on the first pressing plate, the first plate body and the second plate body respectively; The bottom end of the linkage rod passes through the tank body and is provided with a second spline sleeve, the second spline sleeve is rotatably connected to the outer wall of the tank body, and a second rotary driver for controlling the rotation of the second spline sleeve is provided outside the tank body.

[0016] Beneficial effects of the present invention: When the filter screen is clogged and the drainage rate decreases, the present invention suspends the injection of wastewater into the tank body, and then the extrusion control mechanism drives the filter screen to descend, and the filter screen moves to the bottom end of the ring body. The fluid in the chamber will pass through the filter screen to separate the blockage on the filter screen, thereby realizing the cleaning of the filter screen during the wastewater treatment and purification process, and further improving the working efficiency of wastewater separation and purification. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 A top view of the present invention; Figure 3 for Figure 2 AA direction cross-sectional view; Figure 4 for Figure 3 Schematic diagram of the three-dimensional structure; Figure 5 It is a schematic diagram of the internal structure of the present invention in the filtering state; Figure 6 for Figure 5 The enlarged view of point B; Figure 7 It is a schematic diagram of the internal structure of the present invention in a clean state; Figure 8 for Figure 7 Enlarged view of point C.

[0019] The numbers in the figure are: 1-tank body; 11-water inlet pipe; 12-water outlet pipe; 13-first rotary drive; 14-liquid inlet; 15-liquid outlet; 2-stirring paddle; 3-feeding device; 4-first plate body; 41-filter port; 5-second plate body; 51-through port; 52-ring body; 6-filter screen; 61-frame body; 62-net body; 63-connecting rod; 64-thrust rod; 65-sliding member; 651-limiting rod; 652-third elastic element; 7-extrusion control mechanism; 71-linking rod; 711-first retaining ring; 7 12-first limit plate; 713-first elastic element; 72-first pressure plate; 721-first sealing plate; 73-second pressure plate; 74-linear drive; 75-first spline sleeve; 76-second spline sleeve; 77-second rotary drive; 8-baffle; 81-second sealing plate; 82-cylinder; 83-second baffle ring; 84-second limit plate; 85-second elastic element; 9-third sealing plate; 91-column; 92-third baffle ring; 93-third limit plate; 94-fourth elastic element. DETAILED DESCRIPTION

[0020] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0021] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0022] The first aspect of the present invention provides a wastewater separation and purification device for pesticide production, such as Figures 1 to 4 As shown, A sewage separation and purification device for pesticide production, comprising a tank body 1, an inlet pipe 11 and an outlet pipe 12 are respectively arranged above and below the tank body 1, a stirring paddle 2 is arranged inside the tank body 1, a first rotary driver 13 for controlling the rotation of the stirring paddle 2 is arranged outside the tank body 1, and a feeding device 3 connected to the inside of the tank body 1 is arranged outside the tank body 1; the sewage separation and purification device also includes a first plate body 4 and a second plate body 5 arranged inside the tank body 1 from top to bottom, a gap is formed between the first plate body 4 and the second plate body 5, and the first plate body 4 and the second plate body 5 are both located below the stirring paddle 2; The first plate body 4 is provided with a filter port 41, and the filter port 41 is provided with a filter screen 6; The second plate 5 is provided with a through hole 51, and the upper part of the tank body 1 is connected with the water outlet pipe 12 through the filter screen 6 and the through hole 51; A ring body 52 is provided on the top of the second plate body 5, the ring body 52 forms a chamber and the ring body 52 is directly below the filter port 41. The sewage separation and purification device also includes an extrusion control mechanism 7, which controls the filter screen 6 to move toward the bottom end of the ring body 52. ​​The fluid in the chamber will pass through the filter screen 6 to remove the blockage on the filter screen 6.

[0023] In this embodiment, when in use, wastewater is input into the tank body 1 through the water inlet pipe 11, and at the same time, the feeding device 3 also inputs the treatment agent into the tank body 1, and the first rotary driver 13 is turned on to drive the stirring paddle 2 to rotate, so that the wastewater and the treatment agent are mixed, and the wastewater in the tank body 1 passes through the filter screen 6 and enters the gap between the first plate body 4 and the second plate body 5, and then flows to the bottom of the tank body 1 through the opening 51 opened on the second plate body 5, and finally discharged from the water outlet pipe 12; When the filter screen 6 is clogged and the drainage rate decreases, the injection of wastewater into the tank body 1 is stopped, and then the extrusion control mechanism 7 drives the filter screen 6 to descend, and the filter screen 6 moves to the bottom end of the ring body 52. ​​The fluid in the chamber will pass through the filter screen 6 to remove the blockage on the filter screen 6. The fluid described here can be a liquid filtered by the filter screen 6 or a gas retained in the tank body 1, but it is specifically a liquid here. The blockage is squeezed out by the liquid passing through the filter screen 6 and mixed with the liquid between the first plate body 4 and the second plate body 5. Then, an appropriate amount of clean water is injected into the tank body 1 through the water inlet pipe 11. The clean water passes through the filter port 41 to flush the blockage and liquid mixture retained between the first plate body 4 and the second plate body 5, and finally flows to the bottom of the tank body 1 through the through port 51 opened on the second plate body 5, and is finally discharged from the outlet pipe 12 to complete the cleaning of the filter screen 6.

[0024] The first rotary driver 13 is a motor, which is connected to the stirring paddle 2 through a coupling; The feeding device 3 is a spiral feeder but is not limited thereto.

[0025] Embodiment 2, in order to avoid the problem that the liquid in the chamber formed by the ring body 52 cannot be completely drained, as Figure 3 and Figure 4 As shown, further: A baffle plate 8 is disposed inside the ring body 52 , and the baffle plate 8 is slidably and sealingly connected to the inner wall of the ring body 52 . The extrusion control mechanism 7 is also used to drive the baffle plate 8 to move along the axial direction of the ring body 52 .

[0026] In this embodiment, the baffle 8 is at the top of the ring body 52 under normal conditions, thereby preventing the liquid filtered by the filter screen 6 from entering the interior of the chamber of the ring body 52. ​​When the filter screen 6 is blocked and the drainage rate decreases, the injection of wastewater into the tank body 1 is suspended, and then the extrusion control mechanism 7 drives the baffle 8 to move down to the bottom of the chamber, and then drives the filter screen 6 to descend, and the filter screen 6 moves to the bottom of the ring body 52. ​​The fluid in the chamber will pass through the filter screen 6 to separate the blockage on the filter screen 6, which is mainly gas here. The gas passes through the filter screen 6 to squeeze out the blockage and make it on the top surface of the filter screen 6. An appropriate amount of clean water is injected into the tank body 1 through the water inlet pipe 11, and the clean water passes through the filter port 41 to flush the blockage attachments on the top surface of the filter screen 6. Finally, it flows to the bottom of the tank body 1 through the through port 51 opened on the second plate body 5, and is finally discharged from the outlet pipe 12 to complete the cleaning of the filter screen 6.

[0027] Embodiment 3: In order to make the filter screen 6 cleanable even when waste water is left inside the tank body 1, Figures 5 to 8 As shown, further: The extrusion control mechanism 7 includes a connecting rod 71 that passes through the first plate body 4 and the second plate body 5, and the connecting rod 71 is provided with a first pressure plate 72 and a second pressure plate 73. The first pressure plate 72 is located above the first plate body 4, and the second pressure plate 73 is located below the second plate body 5. The second pressure plate 73 is transmission-connected to the filter screen 6 and the baffle 8. A linear drive 74 is provided at the bottom of the tank body 1 for controlling the longitudinal movement of the connecting rod 71.

[0028] The connecting rod 71 is slidably connected with the first pressure plate 72, and the first pressure plate 72 is provided with a first sealing plate 721 corresponding to the filter port 41, and the connecting rod 71 is provided with a first baffle ring 711, and the first pressure plate 72 is located above the first baffle ring 711, and the top of the connecting rod 71 is provided with a first limit plate 712, and the first limit plate 712 is provided with a first elastic element 713, and the first elastic element 713 pushes the first pressure plate 72 to contact the first baffle ring 711.

[0029] The baffle 8 includes a second sealing plate 81 which is slidingly sealed and arranged inside the ring body 52. ​​A cylinder 82 is penetrated on the second sealing plate 81. The bottom end of the cylinder 82 sequentially penetrates the second plate body 5 and the second pressure plate 73. A second baffle ring 83 is arranged on the cylinder 82. The second baffle ring 83 is located between the second plate body 5 and the second pressure plate 73. A second limit plate 84 is arranged at the bottom end of the cylinder 82. A second elastic element 85 is arranged on the second limit plate 84. The second elastic element 85 pushes the second pressure plate 73 to contact the second baffle ring 83.

[0030] The filter screen 6 includes a frame 61 and a mesh body 62 disposed on the frame 61. A connecting rod 63 penetrating the cylinder 82 is disposed at the bottom of the frame 61, and the connecting rod 63 is slidably and sealingly connected to the cylinder 82. The bottom end of the connecting rod 63 is provided with a top rod 64 facing the bottom surface of the second pressing plate 73; A sliding member 65 is arranged below the connecting rod 63, and the sliding member 65 is circumferentially slidably connected to the inner wall of the tank body 1. A limiting rod 651 is arranged on the sliding member 65, and the limiting rod 651 passes through the bottom end of the connecting rod 63 and is slidably connected thereto. The sliding member 65 is also provided with a third elastic element 652 for pushing the connecting rod 63 to move upward.

[0031] The sewage separation and purification device further includes a third sealing plate 9, which is located between the first plate body 4 and the second plate body 5, and the third sealing plate 9 corresponds to the position of the through opening 51; A column 91 is provided at the bottom of the third sealing plate 9, and the column 91 passes through the through opening 51 and the second pressure plate 73 in sequence. A third baffle ring 92 is provided on the column 91 and is located above the second pressure plate 73. A third limiting plate 93 is provided at the bottom end of the column 91, and a fourth elastic element 94 is provided on the third limiting plate 93. The fourth elastic element 94 is used to push the second pressure plate 73 to contact the third baffle ring 92.

[0032] The tank body 1 is symmetrically provided with a liquid inlet 14 and a liquid outlet 15 , and both the liquid inlet 14 and the liquid outlet 15 are located between the first plate body 4 and the second plate body 5 .

[0033] The first plate body 4 and the second plate body 5 are both rotatably connected to the inner wall of the tank body 1; The first pressing plate 72, the first plate body 4 and the second plate body 5 are all fixedly provided with a first spline sleeve 75, and the linkage rod 71 is slidably connected with the first spline sleeve 75 on the first pressing plate 72, the first plate body 4 and the second plate body 5 respectively; The bottom end of the linkage rod 71 passes through the tank body 1 and is provided with a second spline sleeve 76 . The second spline sleeve 76 is rotatably connected to the outer wall of the tank body 1 . A second rotary driver 77 for controlling the rotation of the second spline sleeve 76 is provided outside the tank body 1 .

[0034] In this embodiment, when the filtering process is performed, the filter port 41 and the through port 51 are both in an open state, and the waste water in the tank body 1 passes through the filter screen 6 into the gap between the first plate body 4 and the second plate body 5, and then flows to the bottom end of the tank body 1 through the through port 51 opened on the second plate body 5, and finally discharged from the outlet pipe 12; When the filter screen 6 is clogged and the drainage rate decreases, the extrusion control mechanism 7 starts to work, and the linear drive 74 drives the first pressing plate 72 and the second pressing plate 73 to start to descend with it through the linkage rod 71. The first pressing plate 72 drives the first sealing plate 721 to descend to close the filter port 41, and the second pressing plate 73 drives the third sealing plate 9 to descend to close the through port 51. When the second pressing plate 73 descends, it also drives the second sealing plate 81 to descend to the bottom of the chamber of the ring body 52. ​​At this time, a closed filtering space is formed between the first plate body 4 and the second plate body 5. Next, the linear drive 74 continues to lead the linkage rod 71 to descend, and the linkage rod 71 presses down the push rod 64 through the second pressure plate 73. The push rod 64 drives the connecting rod 63 to overcome the pre-tightening force of the third elastic element 652 to descend, so that the mesh body 62 moves toward the bottom end of the ring body 52, and the fluid in the chamber will pass through the filter 6 to separate the blockage on the mesh body 62, which is mainly gas here. The gas passes through the mesh body 62 to squeeze out the blockage and make it on the top surface of the filter 6; in the second stage of the movement of the linkage rod 71, in order to ensure that the mesh body 62 of the filter 6 can be smoothly lowered, the first elastic element 713, the second elastic element 85 and the fourth elastic element 94 are set to ensure the margin for the linkage rod 71 to continue to move; Next, clean water is injected into the filter space through the liquid inlet 14 of the tank body 1 and the liquid outlet 15 is opened. The clean water passes through the mesh body 62 and flushes the blocking attachments on its top surface, and is finally discharged from the liquid outlet 15 to complete the cleaning of the filter 6. During this process, the second rotary driver 77 drives the connecting rod 71 to rotate through the second spline sleeve 76. Since more than one filter port 41 is provided on the first plate body 4, in order to flush multiple filter screens 6 without leaving any corners, the first plate body 4 and the second plate body 5 are driven to rotate so that the mesh body 62 of each filter screen 6 can be flushed.

[0035] The purpose of the sliding member 65 at the bottom end of the filter 6, which is circumferentially slidably connected to the inner wall of the tank body 1, and the limiting rod 651 and the third elastic element 652 arranged above it is to prevent the third elastic element 652 from affecting the action of the connecting rod 63 due to the need to rotate the first plate body 4 and the second plate body 5.

[0036] The linear drive 74 is preferably a single-axis cylinder, the output shaft of which is rotatably connected to the bottom end of the connecting rod 71, the first elastic element 713, the second elastic element 85, the third elastic element 652 and the fourth elastic element 94 are preferably springs, and the second rotary drive 77 is a motor, which drives the second spline sleeve 76 to rotate through a pulley group.

[0037] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0038] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A wastewater separation and purification device for pesticide production, comprising a tank body (1), a water inlet pipe (11) and a water outlet pipe (12) are respectively arranged above and below the tank body (1), a stirring paddle (2) is arranged inside the tank body (1), a first rotary driver (13) for controlling the rotation of the stirring paddle (2) is arranged outside the tank body (1), and a feeding device (3) is arranged outside the tank body (1) and communicated with the inside of the tank body (1); characterized in that: The sewage separation and purification device further comprises a first plate body (4) and a second plate body (5) which are arranged from top to bottom inside the tank body (1), a gap is formed between the first plate body (4) and the second plate body (5), and the first plate body (4) and the second plate body (5) are both located below the stirring paddle (2); The first plate body (4) is provided with a filter opening (41), and a filter screen (6) is arranged at the filter opening (41); The second plate (5) is provided with a through opening (51), and the upper part of the tank body (1) is connected to the water outlet pipe (12) through the filter screen (6) and the through opening (51); A ring body (52) is arranged on the top of the second plate body (5), the ring body (52) forming a chamber and the ring body (52) being located directly below the filter port (41), the sewage separation and purification device further comprising an extrusion control mechanism (7), the extrusion control mechanism (7) controlling the filter screen (6) to move toward the bottom end of the ring body (52), so that the fluid in the chamber passes through the filter screen (6) so that the blockage on the filter screen (6) is detached.

2. A wastewater separation and purification device for pesticide production according to claim 1, characterized in that: A baffle (8) is arranged inside the ring body (52), and the baffle (8) is slidably and sealingly connected to the inner wall of the ring body (52). The extrusion control mechanism (7) is also used to drive the baffle (8) to move axially along the ring body (52).

3. A wastewater separation and purification device for pesticide production according to claim 2, characterized in that: The extrusion control mechanism (7) comprises a connecting rod (71) penetrating the first plate body (4) and the second plate body (5); a first pressing plate (72) and a second pressing plate (73) are arranged on the connecting rod (71); the first pressing plate (72) is located above the first plate body (4); the second pressing plate (73) is located below the second plate body (5); the second pressing plate (73) is transmission-connected to the filter screen (6) and the baffle (8); and a linear drive (74) for controlling the longitudinal movement of the connecting rod (71) is arranged at the bottom of the tank body (1).

4. A wastewater separation and purification device for pesticide production according to claim 3, characterized in that: The connecting rod (71) is slidably connected to the first pressing plate (72); a first sealing plate (721) corresponding to the filter port (41) is provided on the first pressing plate (72); a first retaining ring (711) is provided on the connecting rod (71) and the first pressing plate (72) is located above the first retaining ring (711); a first limiting plate (712) is provided at the top end of the connecting rod (71); a first elastic element (713) is provided on the first limiting plate (712); and the first elastic element (713) pushes the first pressing plate (72) to contact the first retaining ring (711).

5. The wastewater separation and purification device for pesticide production according to claim 3, characterized in that: The baffle plate (8) comprises a second sealing plate (81) which is slidingly sealed and arranged inside the ring body (52); a cylinder (82) is arranged through the second sealing plate (81); the bottom end of the cylinder (82) passes through the second plate body (5) and the second pressure plate (73) in sequence; a second baffle ring (83) is arranged on the cylinder (82); the second baffle ring (83) is located between the second plate body (5) and the second pressure plate (73); a second limit plate (84) is arranged at the bottom end of the cylinder (82); a second elastic element (85) is arranged on the second limit plate (84); the second elastic element (85) pushes the second pressure plate (73) to contact the second baffle ring (83).

6. The wastewater separation and purification device for pesticide production according to claim 5, characterized in that: The filter screen (6) comprises a frame (61) and a mesh body (62) arranged on the frame (61); a connecting rod (63) penetrating the cylinder (82) is arranged at the bottom of the frame (61); and the connecting rod (63) is slidably and sealingly connected to the cylinder (82); The bottom end of the connecting rod (63) is provided with a top rod (64) facing the bottom surface of the second pressing plate (73); A sliding member (65) is provided below the connecting rod (63), the sliding member (65) being circumferentially slidably connected to the inner wall of the tank body (1), a limiting rod (651) being provided on the sliding member (65), the limiting rod (651) penetrating the bottom end of the connecting rod (63) and being slidably connected thereto, and a third elastic element (652) for pushing the connecting rod (63) to move upward is also provided on the sliding member (65).

7. The wastewater separation and purification device for pesticide production according to claim 3, characterized in that: The sewage separation and purification device further comprises a third sealing plate (9), the third sealing plate (9) being located between the first plate body (4) and the second plate body (5), and the third sealing plate (9) corresponds to the position of the through opening (51); A column (91) is provided at the bottom of the third sealing plate (9), the column (91) sequentially passing through the through opening (51) and the second pressure plate (73), a third retaining ring (92) is provided on the column (91) and is located above the second pressure plate (73), a third limiting plate (93) is provided at the bottom end of the column (91), a fourth elastic element (94) is provided on the third limiting plate (93), and the fourth elastic element (94) is used to push the second pressure plate (73) to contact the third retaining ring (92).

8. The wastewater separation and purification device for pesticide production according to claim 1, characterized in that: The tank body (1) is symmetrically provided with a liquid inlet (14) and a liquid outlet (15), and the liquid inlet (14) and the liquid outlet (15) are both located between the first plate body (4) and the second plate body (5).

9. The wastewater separation and purification device for pesticide production according to claim 3, characterized in that: The first plate body (4) and the second plate body (5) are both rotatably connected to the inner wall of the tank body (1); The first pressure plate (72), the first plate body (4) and the second plate body (5) are all fixedly provided with a first spline sleeve (75), and the connecting rod (71) is slidably connected to the first pressure plate (72), the first plate body (4) and the first spline sleeve (75) on the second plate body (5); The bottom end of the connecting rod (71) passes through the tank body (1) and is provided with a second spline sleeve (76), the second spline sleeve (76) being rotatably connected to the outer wall of the tank body (1), and a second rotary drive (77) for controlling the rotation of the second spline sleeve (76) is provided outside the tank body (1).

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