A sewage separation and purification device for pesticide production

Abstract

The present invention relates to the technical field of wastewater treatment, and specifically relates to a sewage separation and purification device for pesticide production, which includes a first plate body and a second plate body arranged inside the tank body; a filter opening is formed on the first plate body, and a filter screen is arranged at the filter opening; a through opening is formed on the second plate body; a ring body is arranged at the top of the second plate body, the ring body forms a chamber and the ring body is directly below the filter opening. The sewage separation and purification device further includes a squeezing control mechanism, and the squeezing control mechanism controls the filter screen to move towards the bottom end of the ring body. When the drainage rate decreases due to the blockage of the filter screen during the wastewater treatment and purification process of the present invention, the injection of wastewater into the tank body is paused, and then the squeezing control mechanism drives the filter screen to descend. The filter screen moves towards the bottom end of the ring body, and the fluid in the chamber will pass through the filter screen to make the blockage on the filter screen fall off, 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.

Description

Technical Field

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

[0002] The sewage generated during pesticide production contains a large amount of organic matter, chemical substances, and possible heavy metals and other pollutants. If this sewage is directly discharged into the environment, it will cause serious pollution to the surrounding water bodies 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 screen. However, during long-term use, the filter screen will inevitably become clogged to a certain extent, thus affecting the wastewater filtration and causing the problem of slow separation and purification process.

[0004] Chinese Patent: CN202321101498.1 discloses a filtering and impurity removing device for pesticide production, which solves the problem that when the filtering structure directly affects the filtering quality in the prior art, if the filtering structure is not cleaned in time, it will not only be clogged and reduce the filtering efficiency, but also reduce the filtering quality. However, this filtering and impurity removing 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 pesticide production, affecting the sewage separation and purification efficiency, a sewage separation and purification device for pesticide production is proposed to solve this problem. Summary of the Invention

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

[0007] Based on the above purpose, the present invention provides a sewage separation and purification device for pesticide production, which includes a tank body. An inlet pipe and an 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. A feeding device communicating with the inside of the tank body is arranged outside the tank body; the sewage separation and purification device further includes a first plate body and a second plate body arranged in the tank body from top to bottom. A gap is formed between the first plate body and the second plate body, and both the first plate body and the second plate body are located below the stirring paddle;

[0008] A filter opening is formed on the first plate body, and a filter screen is arranged at the filter opening;

[0009] A through - opening is formed in the second plate body, and the upper part inside the tank body is communicated with the water outlet pipe through a filter screen and the through - opening;

[0010] A ring body is arranged at the top of the second plate body. The ring body forms a chamber and is located directly below the filter opening. The sewage separation and purification device further includes a squeezing control mechanism. The squeezing control mechanism controls the filter screen to move towards the bottom end of the ring body, and the fluid in the chamber will pass through the filter screen so that the blockage on the filter screen is detached.

[0011] Preferably, a baffle is arranged inside the ring body. The baffle is slidably and sealingly connected to the inner wall of the ring body. The squeezing control mechanism is also used to drive the baffle to move along the axial direction of the ring body.

[0012] Preferably, the squeezing control mechanism includes a linkage rod penetrating through the first plate body and the second plate body. A first pressing plate and a second pressing plate are arranged on the linkage rod. The first pressing plate is above the first plate body, and the second pressing plate is below the second plate body. The second pressing plate is in transmission connection with the filter screen and the baffle. A linear actuator for controlling the longitudinal movement of the linkage rod is arranged at the bottom of the tank body.

[0013] Preferably, the linkage rod is slidably connected to the first pressing plate. A first sealing plate corresponding to the filter opening is arranged on the first pressing plate. A first retaining ring is arranged on the linkage rod and the first pressing plate is above the first retaining ring. A first limiting plate is arranged at the top end of the linkage rod, and a first elastic element is arranged on the first limiting plate. The first elastic element pushes the first pressing plate to abut against the first retaining ring.

[0014] Preferably, the baffle includes a second sealing plate slidably and sealingly arranged inside the ring body. A cylinder body penetrates through the second sealing plate. The bottom end of the cylinder body sequentially penetrates through the second plate body and the second pressing plate. A second retaining ring is arranged on the cylinder body. The second retaining ring is between the second plate body and the second pressing plate. A second limiting plate is arranged at the bottom end of the cylinder body, and a second elastic element is arranged on the second limiting plate. The second elastic element pushes the second pressing plate to abut against the second retaining ring.

[0015] Preferably, the filter screen includes a frame body and a mesh body arranged on the frame body. A connecting rod penetrating through the cylinder body is arranged at the bottom of the frame body, and the connecting rod is slidably and sealingly connected to the cylinder body;

[0016] A top rod facing the bottom surface of the second pressing plate is arranged at the bottom end of the connecting rod;

[0017] A sliding member is arranged below the connecting rod. The sliding member is circumferentially slidably connected to the inner wall of the tank body. A limiting rod is arranged on the sliding member. The limiting rod penetrates through the bottom end of the connecting rod and is slidably connected to it. A third elastic element for pushing the connecting rod to move upward is also arranged on the sliding member.

[0018] Preferably, the sewage separation and purification device further includes a third sealing plate, which is located between the first plate body and the second plate body and corresponds to the position of the through port;

[0019] A cylinder is provided at the bottom of the third sealing plate. The cylinder sequentially penetrates through the through port and the second pressing plate. A third retaining ring is provided on the cylinder and is located above the second pressing plate. A third limiting plate is provided at the bottom end of the cylinder, and a fourth elastic element is provided on the third limiting plate for pushing the second pressing plate to abut against the third retaining ring.

[0020] 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.

[0021] Preferably, both the first plate body and the second plate body are rotatably connected to the inner wall of the tank body;

[0022] First spline sleeves are fixedly provided on the first pressing plate, the first plate body and the second plate body. The linkage rod is slidably connected to the first spline sleeves on the first pressing plate, the first plate body and the second plate body respectively;

[0023] The bottom end of the linkage rod penetrates 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.

[0024] Advantages of the present invention:

[0025] When the filter screen is blocked and the drainage rate decreases during the wastewater treatment and purification process of the present invention, the injection of wastewater into the tank body is paused, and then the extrusion control mechanism drives the filter screen to descend. The filter screen moves towards the bottom end of the ring body, and the fluid in the chamber will pass through the filter screen to make the blockage on the filter screen fall off, 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

[0026] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only those of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 is a three-dimensional structural diagram of the present invention;

[0028] Figure 2 is a top view of the present invention;

[0029] Figure 3 is Figure 2 a cross-sectional view taken along the A-A direction of

[0030] Figure 4 is Figure 3 a schematic three-dimensional structure diagram of

[0031] Figure 5 a schematic internal structure diagram of the present invention in the filtering state;

[0032] Figure 6 is Figure 5 an enlarged view of part B of

[0033] Figure 7 a schematic internal structure diagram of the present invention in the cleaning state;

[0034] Figure 8 is Figure 7 an enlarged view of part C of

[0035] The reference numerals in the figure are:

[0036] 1 - tank body; 11 - water inlet pipe; 12 - water outlet pipe; 13 - first rotary driver; 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 - mesh body; 63 - connecting rod; 64 - ejector rod; 65 - sliding member; 651 - limiting rod; 652 - third elastic element; 7 - extrusion control mechanism; 71 - linkage rod; 711 - first retaining ring; 712 - first limiting plate; 713 - first elastic element; 72 - first pressing plate; 721 - first sealing plate; 73 - second pressing plate; 74 - linear driver; 75 - first spline sleeve; 76 - second spline sleeve; 77 - second rotary driver; 8 - baffle; 81 - second sealing plate; 82 - cylinder body; 83 - second retaining ring; 84 - second limiting plate; 85 - second elastic element; 9 - third sealing plate; 91 - column body; 92 - third retaining ring; 93 - third limiting plate; 94 - fourth elastic element. Specific embodiments

[0037] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to specific embodiments.

[0038] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the ordinary meanings understood by those with ordinary skills in the field to which the present invention pertains. The "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "comprising" or "including" mean that the elements or objects appearing before this term cover the elements or objects listed after this term and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0039] In the first aspect of the present invention, a sewage separation and purification device for the production of pesticides is proposed. As Figures 1 to 4 shown,

[0040] A sewage separation and purification device for the production of pesticides includes 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. A feeding device 3 communicating with the inside of the tank body 1 is arranged outside the tank body 1; The sewage separation and purification device further includes a first plate body 4 and a second plate body 5 arranged in 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 both the first plate body 4 and the second plate body 5 are located below the stirring paddle 2;

[0041] A filter opening 41 is formed on the first plate body 4, and a filter screen 6 is arranged at the filter opening 41;

[0042] A through opening 51 is formed on the second plate body 5. The upper part inside the tank body 1 is communicated with the outlet pipe 12 through the filter screen 6 and the through opening 51;

[0043] A ring body 52 is arranged at 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 opening 41. The sewage separation and purification device further includes an extrusion control mechanism 7. The extrusion control mechanism 7 controls the filter screen 6 to move towards the bottom end of the ring body 52, and the fluid in the chamber will pass through the filter screen 6 so that the blockages on the filter screen 6 are separated.

[0044] 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;

[0045] 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.

[0046] The first rotary driver 13 is a motor, which is connected to the stirring paddle 2 through a coupling;

[0047] The feeding device 3 is a spiral feeder but is not limited thereto.

[0048] 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:

[0049] 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 .

[0050] In this embodiment, the baffle 8 is at the top of the annular body 52 under normal conditions, thus preventing the liquid filtered by the filter screen 6 from entering the interior of the chamber of the annular body 52. When the filter screen 6 is blocked and the drainage rate decreases, the injection of wastewater into the interior of the tank body 1 is paused. Then, the extrusion control mechanism 7 is squeezed to drive the baffle 8 to move down to the bottom of the chamber. Next, the filter screen 6 is driven to descend. The filter screen 6 moves towards the bottom of the annular body 52, and the fluid in the chamber will pass through the filter screen 6 so that the blockage on the filter screen 6 is detached. Here, it is mainly gas. The blockage is extruded by the gas passing through the filter screen 6 and is located 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. The clean water passes through the filter orifice 41 to wash the blocked attachments on the top surface of the filter screen 6. Finally, it flows to the bottom of the tank body 1 through the through hole 51 formed in the second plate body 5 and is finally discharged through the water outlet pipe 12 to complete the cleaning of the filter screen 6.

[0051] Embodiment Three. In order to enable the cleaning of the filter screen 6 to still be carried out when there is wastewater remaining inside the tank body 1, as Figures 5 to 8 shown, further:

[0052] The extrusion control mechanism 7 includes a linkage rod 71 that penetrates through 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 linkage rod 71. The first pressing plate 72 is above the first plate body 4, and the second pressing plate 73 is below the second plate body 5. The second pressing plate 73 is in transmission connection with the filter screen 6 and the baffle 8. A linear actuator 74 for controlling the longitudinal movement of the linkage rod 71 is arranged at the bottom of the tank body 1.

[0053] The linkage rod 71 is slidably connected to the first pressing plate 72. A first sealing plate 721 corresponding to the filter orifice 41 is arranged on the first pressing plate 72. A first retaining ring 711 is arranged on the linkage rod 71 and the first pressing plate 72 is above the first retaining ring 711. A first limiting plate 712 is arranged at the top end of the linkage rod 71. A first elastic element 713 is arranged on the first limiting plate 712, and the first elastic element 713 pushes the first pressing plate 72 to abut against the first retaining ring 711.

[0054] The baffle 8 includes a second sealing plate 81 that is slidably and sealingly arranged inside the annular body 52. A cylinder body 82 is penetrated through the second sealing plate 81. The bottom end of the cylinder body 82 sequentially penetrates through the second plate body 5 and the second pressing plate 73. A second retaining ring 83 is arranged on the cylinder body 82, and the second retaining ring 83 is between the second plate body 5 and the second pressing plate 73. A second limiting plate 84 is arranged at the bottom end of the cylinder body 82. A second elastic element 85 is arranged on the second limiting plate 84, and the second elastic element 85 pushes the second pressing plate 73 to abut against the second retaining ring 83.

[0055] The filter screen 6 includes a frame body 61 and a net body 62 disposed on the frame body 61. A connecting rod 63 penetrating the cylinder body 82 is provided at the bottom of the frame body 61, and the connecting rod 63 is slidably and sealingly connected to the cylinder body 82;

[0056] A top rod 64 facing the bottom surface of the second pressing plate 73 is provided at the bottom end of the connecting rod 63;

[0057] A sliding member 65 is provided below the connecting rod 63. The sliding member 65 is circumferentially slidably connected to the inner wall of the tank body 1. A limiting rod 651 is provided on the sliding member 65. The limiting rod 651 penetrates the bottom end of the connecting rod 63 and is slidably connected thereto. A third elastic element 652 for pushing the connecting rod 63 to move upward is also provided on the sliding member 65.

[0058] The sewage separation and purification device further includes a third sealing plate 9. The third sealing plate 9 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 port 51;

[0059] A column body 91 is provided at the bottom of the third sealing plate 9. The column body 91 sequentially penetrates the through port 51 and the second pressing plate 73. A third retaining ring 92 is provided on the column body 91 and is located above the second pressing plate 73. A third limiting plate 93 is provided at the bottom end of the column body 91. A fourth elastic element 94 is provided on the third limiting plate 93. The fourth elastic element 94 is used to push the second pressing plate 73 to abut against the third retaining ring 92.

[0060] Liquid inlets 14 and liquid outlets 15 are symmetrically provided on the tank body 1, and both the liquid inlets 14 and the liquid outlets 15 are located between the first plate body 4 and the second plate body 5.

[0061] Both the first plate body 4 and the second plate body 5 are rotatably connected to the inner wall of the tank body 1;

[0062] First spline sleeves 75 are fixedly provided on the first pressing plate 72, the first plate body 4, and the second plate body 5. The linkage rod 71 is slidably connected to the first spline sleeves 75 on the first pressing plate 72, the first plate body 4, and the second plate body 5 respectively;

[0063] The bottom end of the linkage rod 71 penetrates 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.

[0064] In this embodiment, during the filtering process, both the filter port 41 and the through port 51 are in an open state. The wastewater in the tank body 1 will pass through the filter screen 6 and enter the gap between the first plate body 4 and the second plate body 5, and then flow to the bottom end of the tank body 1 through the through port 51 opened on the second plate body 5, and finally be discharged through the water outlet pipe 12;

[0065] 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.

[0066] 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;

[0067] 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 dead 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.

[0068] 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.

[0069] 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.

[0070] Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the present invention as described above, which are not provided in detail for the sake of brevity.

[0071] 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 shall be included within the protection scope 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) forms a chamber and the ring body (52) is located directly below the filter port (41), the sewage separation and purification device further comprises an extrusion control mechanism (7), the extrusion control mechanism (7) controls the filter screen (6) to move toward the bottom end of the ring body (52), and the fluid in the chamber passes through the filter screen (6) so that the blockage on the filter screen (6) is detached; A baffle (8) is provided inside the ring body (52), and the baffle (8) is slidably and sealingly connected to the inner wall of the ring body (52), and the extrusion control mechanism (7) is also used to drive the baffle (8) to move axially along the ring body (52); 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); 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); the first elastic element (713) pushes the first pressing plate (72) to contact the first retaining ring (711); 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); 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).

2. A wastewater separation and purification device for pesticide production according to claim 1, 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).

3. 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).

4. A wastewater separation and purification device for pesticide production according to claim 2, 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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