A filtering device for cleaning impurities in the preparation process of dichloronicotinic acid

Abstract

The invention discloses a filtering device for cleaning impurities in the preparation process of dichloronicotinic acid, belonging to the technical field of filtering equipment. It mainly aims at the problem that the impurity treatment of existing products is relatively troublesome during the preparation process, and proposes the following technical scheme, including a casing, and a driving mechanism and a water pump body arranged on the top of the casing, wherein a collecting component for collecting waste liquid is arranged inside the casing, and a discharging assembly for discharging waste liquid is installed at the bottom of the collecting component. The present invention combines the filtration and washing of crystals by arranging active components and collecting components, and then realizes the combination of filtration and washing of crystals under the cooperation of the driving mechanism and the filter box, optimizes the production steps, reduces the manual burden, and replaces the existing static filtration with a filter press, thereby increasing the speed of filtering and processing the crystals, reducing the content of impurities and mother liquor in the crystals, reducing the number of washing times, further improving the work efficiency, avoiding the waste of resources, and ensuring the authenticity of sample preparation.

Description

Technical Field

[0001] The invention relates to the technical field of filtering equipment, in particular to a filtering device for cleaning impurities in a dichloronicotinic acid preparation process. Background Art

[0002] Dichloronicotinic acid is a commonly used intermediate in the chemical field. It can be used as a pharmaceutical intermediate for the manufacture of non-steroidal anti-inflammatory drugs, such as niflumic acid, pranoprofen, nicotinic acid and nicotinic acid; it can also be used as a pesticide intermediate, and is an important intermediate for the manufacture of herbicides nicosulfuron and diflufenicol. The production process of dichloronicotinic acid includes the following steps: raw material preparation, reaction of pyridine and thionyl chloride, hydrolysis reaction, crystallization, purification and post-treatment, wherein the crystals need to be filtered, washed and dried in the crystallization and purification steps, so as to remove impurities from the crystals by filtering and washing.

[0003] At present, in the existing technology, the filtration treatment of impurities in the preparation process of a large amount of dichloronicotinic acid mostly adopts a filter press equipment, and the material after the filter press treatment is then transported to a washing device for treatment, while the preparation of a small amount of dichloronicotinic acid, especially the cleaning of impurities in the sample preparation process in the laboratory is basically treated by filter filtration. For example: a Chinese patent with an authorization announcement number of CN221831803U discloses a 2-chloronicotinic acid separation and purification device, including a separation and purification box and a stirring box, the stirring box is fixedly connected to the upper end surface of the separation and purification box, a servo motor is fixedly connected to the upper end surface of the stirring box, and the output end of the servo motor passes through the upper end surface of the stirring box and is fixedly connected to a rotating rod.

[0004] Although the technical solution in the above patent document realizes the filtration and impurity removal of crystals, it still has the following defects: after the crystals are filtered through the filter, they need to be manually taken out and then manually washed, which increases the burden on the staff; the filtration of the crystals only relies on gravity to achieve static filtration, which not only slows the filtration speed and affects the preparation efficiency of the product, but also the crystals are difficult to ensure efficient filtration of impurities mixed in the mother liquor under the influence of gravity alone, which adds a burden to the subsequent washing steps and requires multiple washing operations, further increasing the burden on the staff and reducing work efficiency. Multiple washing operations will further cause the crystals to break, and then the fine crystals are easily cleaned up along with the impurities, resulting in a waste of resources and affecting the data of sample preparation. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a filtering device for cleaning impurities in the preparation process of dichloronicotinic acid. By setting an active component and a collecting component, the filtering and washing of the crystals are combined under the cooperation of a driving mechanism and a filter box, the production steps are optimized, the manual burden is reduced, and the existing static filtration is replaced by a filter press, so as to increase the speed of filtering the crystals, reduce the content of impurities and mother liquor in the crystals, reduce the number of washing times, further improve work efficiency, avoid waste of resources, and ensure the authenticity of sample preparation, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A filtering device for cleaning impurities in a dichloronicotinic acid preparation process comprises a housing, and a driving mechanism and a water pump body arranged on the top of the housing, wherein a collecting component for collecting waste liquid is arranged inside the housing, a discharging assembly for discharging waste liquid is installed at the bottom of the collecting component, and a filtering box for filtering impurities is placed on the collecting component, and an active component for filtering crystals is arranged above the filtering box;

[0008] The active component includes a feeding assembly located on the casing, a lifting assembly for filtering crystals is movably connected to the feeding assembly, a liquid storage assembly for temporarily storing the solution is installed on the lifting assembly, and a knocking assembly located on the feeding assembly is provided above the liquid storage assembly, and the knocking assembly is used to knock the lifting assembly;

[0009] The driving mechanism drives the feeding component to move, the liquid storage component is connected to the water pump body through a conduit, the lifting component is in active contact with the unloading component, and the lifting component is also in active contact with the collecting component.

[0010] As a further solution of the present invention, the casing includes an outer shell, a horizontal plate for carrying objects is arranged inside the outer shell, and notches are opened on the front and rear shell walls of the outer shell, wherein a door frame located on the outer wall of the front side of the outer shell is integrally arranged around the front notch, and two cabinet doors are arranged in a split-leaf manner inside the door frame, and the cabinet doors are movably connected to the door frame through a pin shaft, and the two ends of the pin shaft respectively penetrate the corresponding shell walls of the door frame, and an inspection plate is installed in the rear notch by screws;

[0011] The water pump body is arranged on the top outer wall of the shell, and the feed end of the water pump body is connected with the external solution through a feed pipe, and one end of the conduit is installed at the discharge end of the water pump body.

[0012] As a further solution of the present invention, a hole and a through hole are provided on the top shell wall of the shell, wherein there are two through holes respectively located on both sides of the hole, and the feeding assembly includes a feeding pipe arranged in the hole, the bottom end of the feeding pipe extends to the interior of the shell and is installed with a rotating connector, and a round tube is provided at the bottom end of the rotating connector, and a thread is provided on the outer surface of the round tube.

[0013] As a further scheme of the present invention, the lifting assembly includes a pressure plate for filtering crystals, a circular hole for the passage of a circular tube is opened at the center of the pressure plate, a sleeve is integrally arranged inside the circular hole, an inner groove ring is installed at the top of the sleeve, and the inner groove ring is threadedly connected to the circular tube, a groove is opened at the bottom center of the sleeve, and a baffle for blocking the circular hole is movably connected in the groove through a connecting pin, wherein a torsion spring is sleeved on the connecting pin, two telescopic rods are diagonally arranged at the top of the pressure plate, and the top of the telescopic rod is fixedly connected to the top inner wall of the shell by bolts, and an extrusion piece is also arranged on the pressure plate, and the extrusion piece includes a wedge block located behind the pressure plate, and the wedge block and the pressure plate are fixedly connected by a connecting rod.

[0014] As a further scheme of the present invention, the liquid storage assembly includes an annular liquid storage tank located above the pressure plate, and a plurality of supporting legs are arranged on the bottom outer wall of the annular liquid storage tank in a circumferential direction, and the bottom ends of the supporting legs are fixedly connected to the pressure plate. A multi-section telescopic tube for solution feeding is installed on the top shell wall of the annular liquid storage tank, and the top end of the multi-section telescopic tube passes through the through hole on the left and is connected to the conduit. A discharge pipe for solution discharge is arranged on the bottom shell wall of the annular liquid storage tank, and the bottom end of the discharge pipe passes through the pressure plate, and a control valve is also arranged on the discharge pipe.

[0015] As a further solution of the present invention, the knocking assembly includes an elliptical disk arranged on a circular tube, an annular groove is provided on the peripheral wall of the elliptical disk, a plurality of sliders are slidably connected in the annular groove, a moving rod is installed on the outer wall of each slider, a traction rope is provided on the side of the moving rod away from the slider, and a knocking rod for knocking the pressure plate is bound to the bottom end of the traction rope;

[0016] Two straight plates are sleeved on each moving rod, and the top ends of the straight plates are fixedly connected to the top inner wall of the shell. Each traction rope is sleeved on a restraining plate, and the top end of the restraining plate is also fixedly connected to the top inner wall of the shell.

[0017] As a further solution of the present invention, the driving mechanism includes a motor mounted on the top outer wall of the shell by screws, a transmission shaft is installed at the output end of the motor, the bottom end of the transmission shaft passes through the through hole on the right side and is installed with a driving gear, and a side edge of the driving gear is provided with a gear ring meshing with the driving gear, and the gear ring is fixedly connected to the round tube.

[0018] As a further solution of the present invention, the collecting component includes a collecting bin, a U-shaped rod, a supporting assembly, a lifting cylinder, a linkage assembly and a pushing assembly, wherein the U-shaped rod includes two, which are respectively arranged on both sides of the top of the collecting bin, and the collecting bin is arranged on the horizontal plate, the supporting assembly includes a support plate symmetrically arranged inside the collecting bin, and the bottom of each support plate is symmetrically arranged front and back, and the bottom ends of the plurality of lifting rods penetrate the corresponding shell wall of the collecting bin and are commonly connected to the frame, and the lifting cylinder includes two, which are symmetrically arranged on the bottom shell wall of the horizontal plate, and the output ends of the lifting cylinders are installed on the frame;

[0019] The linkage assembly includes a U-shaped seat symmetrically arranged on the bottom shell wall of the frame body, each U-shaped seat is movably connected to a support rod through a latch, and one end of the support rod away from the U-shaped seat is movably connected to a carrier through a latch, a slide plate is installed on the side wall of the carrier, a rack is arranged on the front side wall of the slide plate, a driven gear meshing with the rack is arranged on the front side of the rack, and the bottom of the slide plate is slidably connected to the bottom inner wall of the shell, and a plurality of driven gears are respectively installed on the bottom ends of corresponding pin shafts;

[0020] The pushing assembly also includes two, which are respectively arranged on both sides of the collecting bin, and the pushing assembly includes a guide rod located on the side of the collecting bin, and support seats are installed at both ends of the guide rod, and the support seats are fixedly connected to the corresponding side walls of the collecting bin by bolts, and a sliding sleeve and a return spring are sleeved on the guide rod, wherein the return spring includes two, which are respectively located on the front and rear sides of the sliding sleeve, and a pushing frame for pushing the filter box is integrally arranged on the inner wall of the sliding sleeve, and a contact rod is installed on the outer wall of the sliding sleeve, and a pushing piece is provided on the front side of the contact rod, and the pushing piece is movably contacted with the contact rod, and the top of the pushing piece is fixedly connected to the lifting assembly by bolts.

[0021] As a further solution of the present invention, the filter box includes a box body located on a support plate, a filter plate is installed on the bottom inner wall of the box body by screws, and L-shaped plates are fixedly connected to both sides of the top of the box body, and the L-shaped plates are in sliding contact with the U-shaped rods.

[0022] As a further solution of the present invention, the unloading assembly includes a notch opened in the bottom shell wall of the collection bin, a collection box located on the bottom outer wall of the collection bin is installed around the bottom of the notch by bolts, a unloading hole is opened on the bottom shell wall of the collection box, a sewage pipe extending to the outside of the shell is installed in the unloading hole, a blocking plate for blocking the unloading hole is slidably connected inside the collection box, the rear side of the blocking plate passes through the corresponding shell wall of the collection box, and is installed with an ear plate, an extension piece is arranged on the ear plate, a convex plate is integrally arranged on the bottom front side of the collection box, and the convex plate and the ear plate are connected by a spring telescopic rod group;

[0023] The extension piece comprises an extension plate which is bilaterally symmetrically arranged on the shell wall at the back of the ear plate, and the two extension plates are connected by a round rod, wherein the round rod is in active contact with the extrusion piece.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. Through the active components consisting of the feeding component, the liquid storage component, the lifting component and the knocking component, the crystals in the filter box are pressed and filtered under the action of the driving mechanism. In conjunction with the collecting components consisting of the collecting bin, the U-shaped rod, the pushing component, the supporting component, the lifting cylinder and the linkage component, the filtration and washing steps are integrated when cleaning the impurities in the crystals. The machine replaces manual labor, reduces the burden on the staff, improves the efficiency of product preparation, shortens the impact time of impurities on the crystals, and ensures the qualified rate of sample preparation.

[0026] 2. The existing static filtration method that relies solely on gravity for filtration is replaced by pressure filtration, which improves the speed of crystallization filtration, reduces the content of impurities and mother liquor in the crystallization, reduces the number of washing times, further improves work efficiency, avoids waste of resources, and ensures the authenticity of sample preparation.

[0027] 3. When the lifting component in the active component moves, it simultaneously drives the pushing component in the collecting component to move, thereby pushing the filter box located in the collecting bin back and forth, so that the crystals falling in the filter box are spread out, thereby ensuring the uniformity of the crystal filtration operation.

[0028] 4. When the lifting assembly descends, the pushing assembly drives the filter box to shake in the initial stage of its descent, thereby achieving the spreading operation of the crystals. When the pressure plate in the collecting assembly is about to enter the interior of the filter box, the pushing assembly resets to the initial state to ensure that the pressure plate accurately enters the interior of the filter box to achieve the squeezing operation of the crystals. When the lifting assembly moves upward, the pushing assembly does not drive the filter box to shake in the initial stage of its ascent. After the pressure plate leaves the filter box, the solution in the liquid storage assembly is released to soak and wash the filter cake in the filter box. After the lifting assembly continues to move upward, the pushing assembly drives the filter box to shake, thereby breaking up the filter cake inside the filter box to facilitate its full contact with the solution in the liquid storage assembly, thereby improving the washing effect of the crystals.

[0029] 5. When the lifting assembly is lifted and lowered, when the pressure plate enters the filter box due to its descent, the extrusion piece in the lifting assembly contacts the discharge assembly, so that the sealing plate opens to facilitate the discharge of waste liquid. After the lifting assembly rises, the extrusion piece moves up, and then the sealing plate in the discharge assembly is reset under the action of the spring telescopic rod, thereby sealing the collection bin and ensuring that the filter cake in the filter box is soaked and washed.

[0030] 6. By setting up the knocking component, the pressure plate is knocked and vibrated during the upward and reset process of the collecting component, so as to clean the crystals adhering to the bottom thereof, avoid the loss of sample resources, further ensure the qualified rate of sample preparation, and reduce the burden of manual cleaning.

[0031] 7. The supporting assembly in the collecting part can be raised and lowered under the action of the lifting cylinder, so as to realize the lifting and lowering of the filter box, thereby facilitating its loading and unloading. The movement of the supporting assembly can drive the two cabinet doors to open and close through the linkage assembly, further reducing the operating burden of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the three-dimensional structure of a filtering device for cleaning impurities in the preparation process of dichloronicotinic acid;

[0033] Figure 2 for Figure 1 A schematic diagram of a partial cross-sectional structure;

[0034] Figure 3 for Figure 2 A schematic diagram of the axial side structure;

[0035] Figure 4 for Figure 2 Schematic diagram of the structure viewed from above;

[0036] Figure 5 for Figure 2 Schematic diagram of the active components and driving mechanism structure;

[0037] Figure 6 for Figure 5 A schematic diagram of the enlarged local structure at A;

[0038] Figure 7 for Figure 5 Schematic diagram of the structure viewed from above;

[0039] Figure 8 for Figure 5 A side view schematic diagram of the structure;

[0040] Fig. 9 for Figure 2 A schematic diagram of the structure of the collecting component and the unloading component;

[0041] Fig.10 for Fig. 9 A schematic diagram of the enlarged local structure at B;

[0042] Fig.11 for Fig. 9 Schematic diagram of the structure viewed from above;

[0043] Fig.12 for Fig.11 A schematic diagram of the enlarged local structure at C;

[0044] Fig.13 for Fig. 9 Schematic diagram of the unloading component structure;

[0045] Fig.14 for Figure 2 Schematic diagram of the filter box structure;

[0046] Fig.15 for Fig.14 Schematic diagram of the structure viewed from above;

[0047] Fig.16 for Figure 5 An enlarged schematic diagram of the local structure at point D.

[0048] In the figure: 1. Casing; 11. Outer shell; 12. Door frame; 13. Cabinet door; 14. Inspection panel; 15. Horizontal plate; 2. Feeding assembly; 21. Feeding pipe; 22. Rotating connector; 23. Round pipe; 3. Lifting assembly; 31. Pressing plate; 32. Sleeve; 33. Inner ring; 34. Baffle; 35. Telescopic rod; 36. Extrusion piece; 4. Liquid storage assembly; 41. Annular liquid storage tank; 42. Multi-section telescopic tube; 43. Discharge pipe; 5. Knocking assembly; 51. Oval disk; 52. Moving rod; 53. Knocking rod; 54. Straight plate; 55. Constraint plate; 6. Driving mechanism; 61. Motor; 62. Driving gear; 63. Gear ring; 7. Pump body ;8. Collecting component;81. Collecting bin;82. U-shaped rod;83. Supporting assembly;831. Support plate;832. Lifting rod;833. Frame;84. Lifting cylinder;85. Linkage assembly;851. Support rod;852. Slide plate;853. Rack;854. Driven gear;86. Pushing assembly;861. Guide rod;862. Pushing frame;863. Contact rod;864. Pushing piece;9. Filter box;91. Box;92. Filter plate;93. L-shaped plate;10. Discharging assembly;101. Collecting box;102. Sealing plate;103. Extension piece;104. Ear plate;105. Protruding plate;106. Spring telescopic rod group. DETAILED DESCRIPTION

[0049] See also Figure 1-Figure 4 In an embodiment of the present invention, a filtering device for cleaning impurities in a dichloronicotinic acid preparation process includes a housing 1, and a driving mechanism 6 and a water pump body 7 disposed on the top of the housing 1. The water pump body 7 is configured to extract a solution for washing crystals.

[0050] A collecting component 8 for collecting waste liquid is arranged inside the housing 1, a discharge assembly 10 for discharging waste liquid is installed at the bottom of the collecting component 8, and a filter box 9 for filtering impurities is placed on the collecting component 8. The placement of the filter box 9 on the collecting component 8 can be adjusted by shaking. An active component for filtering crystals is arranged above the filter box 9, and the active component corresponds to the filter box 9 one by one to ensure that the crystals in the filter box 9 are processed.

[0051] The active component includes a feeding assembly 2 located on the casing 1, and a lifting assembly 3 for filtering crystals is movably connected to the feeding assembly 2. The lifting assembly 3 is driven to be raised and lowered by the movement of the feeding assembly 2. A liquid storage assembly 4 for temporarily storing a solution is installed on the lifting assembly 3. The setting of the liquid storage assembly 4 can quantitatively control the solution required for washing the crystals. A knocking assembly 5 located on the feeding assembly 2 is provided above the liquid storage assembly 4, and the knocking assembly 5 is used to knock the lifting assembly 3. The knocking vibration of the knocking assembly 5 on the lifting assembly 3 prevents the lifting assembly 3 from adhering to a large amount of crystals after the crystals are filtered.

[0052] The driving mechanism 6 drives the feeding assembly 2 to move, and the liquid storage assembly 4 is connected to the water pump body 7 through a conduit. The lifting assembly 3 is in active contact with the unloading assembly 10, and the lifting assembly 3 is also in active contact with the collecting component 8.

[0053] See also Figure 1-Figure 3 In the embodiment of the present invention, the housing 1 includes a shell 11, a horizontal plate 15 for carrying objects is arranged inside the shell 11, and support columns are installed at the four corners of the bottom of the shell 11. A rectangular through groove is opened at the center of the horizontal plate 15 for accommodating the installation of the unloading assembly 10.

[0054] The front and rear walls of the housing 11 are both provided with notches, wherein a door frame 12 is integrally provided around the front notch and located on the front outer wall of the housing 11. Two cabinet doors 13 are provided in a split-leaf manner inside the door frame 12, and the cabinet doors 13 are movably connected to the door frame 12 through a pin shaft. The two ends of the pin shaft respectively penetrate the corresponding walls of the door frame 12, and an inspection plate 14 is installed in the rear notch through screws.

[0055] The water pump body 7 is arranged on the top outer wall of the housing 11 , and the feed end of the water pump body 7 is connected to the external solution through a feed pipe. One end of the conduit is installed at the discharge end of the water pump body 7 .

[0056] See also Figure 2 and Figure 5-Figure 7In the embodiment of the present invention, a hole and a through hole are provided on the top shell wall of the shell 11, wherein there are two through holes, which are respectively located on both sides of the hole. The feeding assembly 2 includes a feeding pipe 21 arranged in the hole, the bottom end of the feeding pipe 21 extends to the inside of the shell 11, and is installed with a rotating connector 22. A round tube 23 is provided at the bottom end of the rotating connector 22, and a thread is provided on the outer surface of the round tube 23. The feeding pipe 21 is used to receive the crystals to be processed, and then enters the round tube 23 through the rotating connector 22, and finally, is discharged from the bottom end of the round tube 23 into the filter box 9.

[0057] See also Figure 2-Figure 8 In the embodiment of the present invention, the lifting assembly 3 includes a pressing plate 31 for filtering crystals, and a circular hole for the passage of the circular tube 23 is opened at the center of the pressing plate 31. A sleeve 32 is integrally provided inside the circular hole, and an inner groove ring 33 is installed at the top of the sleeve 32, and the inner groove ring 33 is threadedly connected to the circular tube 23. The circular tube 23 can pass inside the sleeve 32, and the inner groove ring 33 can be lifted and lowered on the circular tube 23.

[0058] A groove is provided at the center of the bottom of the sleeve 32, and a baffle 34 for blocking the circular hole is movably connected in the groove through a connecting pin, wherein a torsion spring is sleeved on the connecting pin. The configuration of the torsion spring enables the baffle 34 to be opened when the circular tube 23 passes through the circular hole, and also to be blocked when the circular tube 23 leaves the circular hole, thereby ensuring the flatness of the bottom of the pressing plate 31.

[0059] Two telescopic rods 35 are arranged diagonally on the top of the pressing plate 31, and the top of the telescopic rods 35 is fixedly connected to the top inner wall of the housing 11 by bolts. The diagonal arrangement of the two telescopic rods 35 ensures the stability of the lifting and lowering activities of the pressing plate 31.

[0060] The pressing plate 31 is also provided with an extrusion piece 36, which includes a wedge-shaped block located behind the pressing plate 31, and the wedge-shaped block is fixedly connected to the pressing plate 31 through a connecting rod. The wedge-shaped block in the extrusion piece 36 is arranged to be inclined on one side.

[0061] See also Figure 2-Figure 8 In the embodiment of the present invention, the liquid storage assembly 4 includes an annular liquid storage tank 41 located above the pressing plate 31, and three supporting legs are arranged on the bottom outer wall of the annular liquid storage tank 41 along the circumferential direction, and the bottom ends of the supporting legs are fixedly connected to the pressing plate 31. The annular liquid storage tank 41 is stably supported by the arrangement of the supporting legs.

[0062] A multi-section telescopic tube 42 for solution feeding is installed on the top shell wall of the annular liquid storage box 41. The top end of the multi-section telescopic tube 42 passes through the through hole on the left side and is connected to the conduit. The multi-section telescopic tube 42 is provided to ensure that the liquid storage component 4 moves along with the lifting component 3.

[0063] A discharge pipe 43 for discharging the solution is provided on the bottom shell wall of the annular liquid storage tank 41, the bottom end of the discharge pipe 43 penetrates the pressing plate 31, and a control valve is also provided on the discharge pipe 43. Through the setting of the control valve, the solution in the annular liquid storage tank 41 is controlled and released.

[0064] See also Figure 2-Figure 8 and Fig.16 In the embodiment of the present invention, the knocking assembly 5 includes an elliptical disk 51 disposed on the circular tube 23, and an annular groove is provided on the peripheral wall of the elliptical disk 51, and two sliders are slidably connected in the annular groove. A moving rod 52 is installed on the outer wall of each slider, and a traction rope is provided on the side of the moving rod 52 away from the slider, and a knocking rod 53 for knocking the pressure plate 31 is bound to the bottom end of the traction rope. The two sliders are diagonally distributed, so that the moving rod 52 is diagonally distributed, thereby ensuring that the knocking rod 53 knocks the pressure plate 31 stably.

[0065] Two straight plates 54 are sleeved on each moving rod 52, and the top of the straight plates 54 is fixedly connected to the top inner wall of the housing 11. The two straight plates 54 constrain the moving rod 52 to ensure that it can perform stable telescopic movement with the movement of the slider. A constraint plate 55 is sleeved on each traction rope, and the top of the constraint plate 55 is also fixedly connected to the top inner wall of the housing 11. The setting of the constraint plate 55 not only constrains the traction rope, but also realizes the steering of the traction rope.

[0066] Each slider in the annular groove of the elliptical disk 51 is always in the current position under the constraint of the corresponding moving rod 52. When the elliptical disk 51 rotates with the movement of the circular tube 23, the position of each slider remains unchanged. Then, when the elliptical disk 51 switches the long side and the short side due to rotation, each slider drives the corresponding moving rod 52 to telescopically adjust due to the change of the long side and the short side of the elliptical disk 51. When the slider is in the long side position of the elliptical disk 51, the corresponding moving rod 52 extends outward. At this time, the knocking rod 53 loaded on the moving rod 52 by the traction rope moves downward under the action of gravity due to the lack of pulling force. When the slider is in the short side position of the elliptical disk 51, the corresponding moving rod 52 retracts inward toward the elliptical disk 51. At this time, the moving rod 52 pulls the knocking rod 53 loaded thereon by the traction rope, so that the corresponding knocking rod 53 moves upward. Through the circumferential rotation of the elliptical disk 51 with the circular tube 23, each knocking rod 53 performs reciprocating lifting and lowering motion.

[0067] The driving mechanism 6 includes a motor 61 mounted on the top outer wall of the housing 11 by screws. A transmission shaft is mounted on the output end of the motor 61, and the bottom end of the transmission shaft passes through the through hole on the right side and is mounted with a driving gear 62. A toothed ring 63 meshing with the driving gear 62 is provided on the side of the driving gear 62, and the toothed ring 63 is fixedly connected to the circular tube 23. The motor 61 drives the transmission shaft to rotate, so that the driving gear 62 moves, and the circular tube 23 rotates and moves through the meshing between the driving gear 62 and the toothed ring 63.

[0068] See also Figure 2-Figure 4 and Figure 9-12 In the embodiment of the present invention, the collecting component 8 includes a collecting bin 81, a U-shaped rod 82, a supporting assembly 83, a lifting cylinder 84, a linkage assembly 85 and a pushing assembly 86. There are two U-shaped rods 82, which are respectively arranged on both sides of the top of the collecting bin 81. The U-shaped rods 82 are used to provide auxiliary support and movement guidance for the filter box 9.

[0069] The collecting bin 81 is disposed on the transverse plate 15 , and U-shaped notches are provided on the shell walls on both sides of the transverse plate 15 to facilitate the movement of the push assembly 86 .

[0070] The supporting assembly 83 includes a support plate 831 symmetrically arranged inside the collection bin 81. A lifting rod 832 is symmetrically arranged at the bottom of each support plate 831, and the bottom ends of the plurality of lifting rods 832 penetrate the corresponding shell wall of the collection bin 81 and are connected to a frame 833. The movement of the frame 833 realizes the synchronous movement of the plurality of lifting rods 832, thereby making the two support plates 831 move synchronously.

[0071] The lifting cylinders 84 include two, which are symmetrically arranged on the bottom shell wall of the horizontal plate 15, and the output ends of the lifting cylinders 84 are both installed on the frame 833. The operation of the lifting cylinders 84 realizes the lifting movement of the frame 833.

[0072] The linkage assembly 85 includes a U-shaped seat symmetrically arranged on the bottom shell wall of the frame 833. Each U-shaped seat is movably connected to a support rod 851 through a latch, and the end of the support rod 851 away from the U-shaped seat is movably connected to a carrier through a plug rod, and a slide plate 852 is installed on the side wall of the carrier. The lifting and lowering of the frame 833 causes each support rod 851 to move synchronously, thereby driving the corresponding slide plate 852 to adjust its displacement.

[0073] A rack 853 is provided on the front side wall of the slide plate 852, and a driven gear 854 meshing with the rack 853 is provided on the front side of the slide plate 852, and the bottom of the slide plate 852 is slidably connected to the bottom inner wall of the housing 11. A plurality of driven gears 854 are respectively installed at the bottom ends of corresponding pins. The movement of the slide plate 852 causes the corresponding rack 853 to move, thereby driving the corresponding driven gear 854 to rotate, thereby realizing the opening and closing movement of the corresponding cabinet door 13.

[0074] The two side walls of the housing 11 are provided with passage grooves, and the ends of the two racks 853 away from the corresponding slides 852 can pass through the corresponding passage grooves. The front side wall of the housing 11 is provided with two rectangular notches, and each driven gear 854 is distributed through the corresponding rectangular notches for meshing with the corresponding rack 853.

[0075] The push-against assembly 86 also includes two, which are respectively arranged on both sides of the collection bin 81. The push-against assembly 86 includes a guide rod 861 located on the side of the collection bin 81. Support seats are installed at both ends of the guide rod 861, and the support seats are fixedly connected to the corresponding side walls of the collection bin 81 by bolts. The push-against assembly 86 arranged on both sides of the collection bin 81 ensures the stability of the drive adjustment of the filter box 9.

[0076] The guide rod 861 is sleeved with a sliding sleeve and a return spring, wherein two return springs are provided, one at the front and the other at the rear of the sliding sleeve. A push frame 862 for pushing against the filter box 9 is integrally provided on the inner wall of the sliding sleeve, and a contact rod 863 is installed on the outer wall of the sliding sleeve. The bottom of the push frame 862 is slidably connected to the corresponding side wall at the top of the collection bin 81, thereby ensuring the stability of the forward and backward movement of the push frame 862.

[0077] The front end of the contact rod 863 is rollingly connected with a ball, and a pusher 864 is provided at the front side of the ball. The pusher 864 is in rolling contact with the contact rod 863, and the top of the pusher 864 is fixedly connected to the lifting assembly 3 by bolts. The pusher 864 is composed of a wave plate and a curved plate, wherein the wave plate is located at the bottom end of the curved plate, and then when the ball of the contact rod 863 contacts the wave plate, as the pusher 864 moves up and down, the sliding sleeve drives the push frame 862 to perform a forward and backward reciprocating motion under the action of the return spring. When the ball of the contact rod 863 contacts the smooth part of the curved plate, the position of the sliding sleeve does not change, thereby ensuring the stability of the filter box 9.

[0078] See also Figure 2-Figure 4 and Figure 14-15In the embodiment of the present invention, the filter box 9 includes a box body 91 located on a support plate 831, and the box body 91 adopts a topless and bottomless design. A filter plate 92 is installed on the bottom inner wall of the box body 91 by screws, so that the filter plate 92 can be easily disassembled and maintained. L-shaped plates 93 are fixedly connected to both sides of the top of the box body 91, and a U-shaped slide groove is provided on the L-shaped plate 93, through which the U-shaped slide groove can be slidably contacted with the corresponding U-shaped rod 82 to ensure the stability of the filter box 9.

[0079] See also Figure 2 , Fig. 9 , Fig.11 and Fig.13 In the embodiment of the present invention, the discharge assembly 10 includes a notch opened in the bottom shell wall of the collection bin 81, and a collection box 101 located on the bottom outer wall of the collection bin 81 is installed around the bottom of the notch by bolts. A discharge hole is opened on the bottom shell wall of the collection box 101, and a sewage pipe extending to the outside of the housing 11 is installed in the discharge hole. The waste liquid can be discharged and processed by setting the sewage pipe.

[0080] The inside of the collection box 101 is slidably connected with a blocking plate 102 for blocking the discharge hole. The rear side of the blocking plate 102 penetrates the corresponding shell wall of the collection box 101 and is installed with an ear plate 104. An extension piece 103 is provided on the ear plate 104, and a convex plate 105 is integrally provided on the bottom front side of the collection box 101. The convex plate 105 and the ear plate 104 are connected by a spring telescopic rod group 106. The spring telescopic rod group 106 is composed of two spring telescopic rods, which are symmetrically distributed on the left and right to ensure the stability of the telescopic reset of the blocking plate 102.

[0081] The extension member 103 includes an extension plate symmetrically arranged on the back wall of the ear plate 104. The two extension plates are connected by a round rod, wherein the round rod is in movable contact with the extrusion member 36. When the extrusion member 36 moves downward, the inclined surface of its wedge block contacts the round rod, and then the extension member 103 is pushed in the process of the extrusion member 36 continuously moving downward, and the blocking plate 102 is pulled open.

[0082] The working principle of the present invention is: during the preparation of dichloronicotinic acid, when the crystals need to be filtered, the crystals to be processed are first placed inside the casing 1 through the feeding assembly 2. The placed crystals fall directly into the filter box 9, and after falling into the filter box 9, the crystals are directly statically filtered under the influence of gravity. The motor 61 in the driving mechanism 6 is started to rotate forward through the external controller body. When the motor 61 rotates forward, the driving gear 62 is driven to move through the transmission shaft, and the driving gear 62 is meshed with the gear ring 63, thereby driving the circular tube 23 in the feeding assembly 2 to rotate. When the circular tube 23 rotates, the elliptical disk 51 in the knocking assembly 5 arranged thereon rotates accordingly. During the rotational movement, the elliptical disk 51 drives the moving rod 52 to reciprocate and extend through the slider, and then drives the corresponding knocking rod 53 to move up and down under the action of the traction rope, thereby realizing the knocking vibration of the pressing plate 31 in the lifting assembly 3.

[0083] The rotation of the circular tube 23 causes the inner grooved ring 33 threaded thereon to drive the pressure plate 31 to move through the sleeve 32. Due to the diagonally arranged telescopic rod 35, when the circular tube 23 rotates, the inner grooved ring 33 drives the pressure plate 31 to move downward through the sleeve 32, stretching the telescopic rod 35.

[0084] As the circular tube 23 continues to move, the pressing plate 31 continues to move downward. During the downward movement, the pressing plate 31 drives the pushers 864 of each push assembly 86 in the collecting component 8 to move vertically downward. When each pusher 864 moves downward, the corresponding contact rod 863 in contact with it drives the corresponding push frame 862 to reciprocate in the front and rear directions through the sliding sleeve under the action of the return spring. During the movement, the push frames 862 in the push assemblies 86 at both sides drive the filter box 9 located on the collecting bin 81 to reciprocate in the front and rear directions.

[0085] The movement of the filter box 9 allows the crystals accumulated inside to be spread out, further accelerating the filtering effect of the crystals.

[0086] When the pressing plate 31 continues to move downward, if the pressing plate 31 is separated from the round tube 23 and has not entered the filter box 9, the pusher 864 moves downward to a flat position, and then under the action of the reset spring, the push frame 862 in each push assembly 86 is reset, thereby realizing the reset of the filter box 9 in the collection bin 81. This facilitates the pressing plate 31 to accurately fall into the filter box 9 during the downward movement.

[0087] After the pressing plate 31 is separated from the circular tube 23 , the baffle 34 thereon is reset under the action of the torsion spring, thereby sealing the groove on the pressing plate 31 .

[0088] After the pressing plate 31 falls into the filter box 9, the extrusion member 36 disposed thereon contacts the round rod of the extension member 103 in the discharge assembly 10. Then, as the pressing plate 31 continues to move downward, the extrusion member 36 squeezes the extension member 103, stretching the spring telescopic rod group 106, so that the blocking plate 102 is opened. Then, the waste liquid filtered into the collection bin 81 is discharged from the sewage pipe.

[0089] The pressing plate 31 continuously moves downward to squeeze the crystals falling into the filter box 9, thereby realizing the filter pressing treatment of the crystals, so that the crystals in the filter box 9 form a filter cake. When the lifting assembly 3 moves downward to the maximum mileage, the motor 61 pauses for a period of time according to program control, so that the pressing plate 31 cooperates with the filter box 9 to filter the crystals and provide the required time for the discharge of waste liquid.

[0090] At this time, the program in the external controller body turns on the water pump body 7, and then extracts the external solution for washing the crystals, and the extracted solution enters the annular liquid storage tank 41 through the conduit and the multi-section telescopic tube 42 for temporary storage. When the annular liquid storage tank 41 stores a suitable solution, the control program turns off the water pump body 7.

[0091] After a period of time, the external controller body starts the motor 61 in the driving mechanism 6 again, and the motor 61 drives the transmission shaft to rotate in the reverse direction. Then, the driving gear 62 is meshed with the gear ring 63 to make the round tube 23 rotate in the reverse direction.

[0092] When the round tube 23 is reversed, the pressure plate 31 is driven to move upward through the inner ring 33. At this time, the upward movement of the pressure plate 31 simultaneously drives the extrusion member 36 and the push member 864 in the push assembly 86 to move upward. After the extrusion member 36 moves upward, the extension member 103 in the discharge assembly 10 is reset under the action of the spring telescopic rod group 106, thereby resetting the blocking plate 102.

[0093] When the pressure plate 31 rises to leave the filter box 9 and the baffle 34 does not contact the circular tube 23, the blocking plate 102 completely blocks the collection box 101. The control valve on the discharge pipe 43 in the liquid storage component 4 is opened under the control of the program, so that the solution temporarily stored in the annular liquid storage tank 41 is discharged into the filter box 9. When the solution enters the filter box 9, it will cause a certain impact on the filter cake, thereby breaking up the filter cake. At this time, due to the blocking of the unloading component 10, the solution that falls into the filter box 9 is stored in the collection bin 81, thereby soaking the filter cake in the filter box 9.

[0094] Then, as the pressure plate 31 continues to move upward, the push member 864 of the push assembly 86 in the collecting component 8 continues to move upward, and contacts the contact rod 863, and then with the cooperation of the return spring, the push frame 862 performs reciprocating motion in the front and rear directions, thereby achieving shaking of the filter box 9.

[0095] When the filter box 9 is shaken, the filter cake is further broken up, and the shaking of the filter box 9 drives the crystals inside it to move in the solution, thereby improving the soaking effect of the crystals and the solution, and achieving a washing effect on them.

[0096] The lifting and lowering of the push member 864 in the push assembly 86 causes the contact rod 863 to drive the reciprocating movement of the push frame 862, thereby realizing the shaking of the filter box 9. In order to ensure that the shaking of the filter box 9 achieves a certain effect, the lifting and lowering movement of the push member 864 is required to reach a higher speed. Since the push member 864 moves with the lifting and lowering of the pressure plate 31, and the pressure plate 31 is threadedly connected to the circular tube 23, the circular tube 23 needs to have a certain rotation speed to ensure the lifting and lowering speed of the pressure plate 31. At this time, the elliptical disk 51 arranged on the circular tube 23 also has a high rotation speed, and when the elliptical disk 51 rotates rapidly, each knocking rod 53 is quickly lifted and lowered to achieve the knocking vibration of the pressure plate 31 that has reached an appropriate height.

[0097] The pressing plate 31 continues to move upward until the baffle 34 on it contacts the circular tube 23, and the pressing plate 31 continues to move upward, and then the baffle 34 is pushed open by the circular tube 23. The knocking assembly 5 will continue to move during the rotation of the circular tube 23, and then after the pressing plate 31 reaches an appropriate distance, the knocking assembly 5 will knock and vibrate it, so that the crystals adhered to the bottom of the pressing plate 31 fall into the filter box 9.

[0098] When the pressure plate 31 moves upward, after the solution in the liquid storage assembly 4 is released, the control valve is automatically closed continuously, and the water pump body 7 is not started to inject the solution into the annular liquid storage tank 41. When the lifting assembly 3 moves upward to the maximum mileage and completes the reset, the control program turns off the motor 61 again and pauses for a period of time.

[0099] After a period of time, when the crystals are washed, the external controller body starts the motor 61 to rotate forward again, so that the pressing plate 31 moves downward. Repeat the above steps, the extruder 36 opens the blocking plate 102 in the discharge assembly 10, so that the waste liquid in the collection bin 81 can be discharged, and the pressing plate 31 again performs the filter pressing treatment on the crystals. Then the motor 61 reverses, so that the lifting assembly 3 is reset to the initial state. During the reset of the lifting assembly 3, the water pump body 7 does not operate.

[0100] After the lifting assembly 3 is reset, the external controller body drives the lifting cylinder 84 in the collection component 8 to move. The lifting cylinder 84 drives the frame 833 in the supporting assembly 83 to move upward, and then the support plate 831 is raised through each lifting rod 832, so as to support the filter box 9 to extend from the collection bin 81. In the process of the frame 833 moving upward, the support rod 851 in the linkage assembly 85 is driven to move, and then the rack 853 is moved under the action of the slide plate 852, so that each driven gear 854 moves, and then the corresponding cabinet door 13 is opened, so that the staff can take the filter box 9 inside the housing 1.

[0101] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A filtering device for cleaning impurities in a dichloronicotinic acid preparation process, comprising a housing (1), and a driving mechanism (6) and a water pump body (7) arranged on the top of the housing (1), characterized in that: A collecting component (8) for collecting waste liquid is arranged inside the housing (1), a discharge assembly (10) for discharging waste liquid is installed at the bottom of the collecting component (8), a filter box (9) for filtering impurities is placed on the collecting component (8), and an active component for filtering crystals is arranged above the filter box (9); The active component comprises a feeding assembly (2) located on the housing (1), a lifting assembly (3) for filtering crystals being movably connected to the feeding assembly (2), a liquid storage assembly (4) for temporarily storing a solution being installed on the lifting assembly (3), and a knocking assembly (5) located on the feeding assembly (2) being arranged above the liquid storage assembly (4), the knocking assembly (5) being used to knock the lifting assembly (3); The driving mechanism (6) drives the feeding component (2) to move, the liquid storage component (4) is connected to the water pump body (7) via a conduit, the lifting component (3) is in active contact with the discharge component (10), and the lifting component (3) is also in active contact with the collection component (8).

2. A filtering device for cleaning impurities in a dichloronicotinic acid preparation process according to claim 1, characterized in that: The housing (1) comprises an outer shell (11), a horizontal plate (15) for carrying objects is arranged inside the outer shell (11), and notches are provided on the front and rear shell walls of the outer shell (11), wherein a door frame (12) located on the front outer wall of the outer shell (11) is integrally arranged around the front notch, and two cabinet doors (13) are arranged in a split manner inside the door frame (12), and the cabinet doors (13) are movably connected to the door frame (12) via a pin shaft, and the two ends of the pin shaft respectively penetrate the corresponding shell walls of the door frame (12), and an inspection plate (14) is installed in the rear notch via screws; The water pump body (7) is arranged on the top outer wall of the housing (11), and the feed end of the water pump body (7) is connected to an external solution via a feed pipe, and one end of the conduit is installed at the discharge end of the water pump body (7).

3. A filtering device for cleaning impurities in the dichloronicotinic acid preparation process according to claim 2, characterized in that: The top shell wall of the shell (11) is provided with a hole and a through hole, wherein there are two through holes, which are respectively located on both sides of the hole. The feeding assembly (2) includes a feeding pipe (21) arranged in the hole, the bottom end of the feeding pipe (21) extends to the inside of the shell (11) and is provided with a rotating connection piece (22), and the bottom end of the rotating connection piece (22) is provided with a round tube (23), and the outer surface of the round tube (23) is provided with a thread.

4. A filtering device for cleaning impurities in the dichloronicotinic acid preparation process according to claim 3, characterized in that: The lifting assembly (3) comprises a pressing plate (31) for filtering crystals, a circular hole for the passage of the circular tube (23) is provided at the center of the pressing plate (31), a sleeve (32) is integrally provided inside the circular hole, an inner groove ring (33) is installed at the top end of the sleeve (32), the inner groove ring (33) is threadedly connected to the circular tube (23), a groove is provided at the bottom center of the sleeve (32), a baffle (34) for blocking the circular hole is movably connected in the groove via a connecting pin, wherein a torsion spring is sleeved on the connecting pin, two telescopic rods (35) are diagonally provided at the top of the pressing plate (31), the top of the telescopic rods (35) are fixedly connected to the top inner wall of the housing (11) via bolts, and an extrusion piece (36) is also provided on the pressing plate (31), the extrusion piece (36) comprises a wedge block located behind the pressing plate (31), and the wedge block is fixedly connected to the pressing plate (31) via a connecting rod.

5. A filtering device for cleaning impurities in the dichloronicotinic acid preparation process according to claim 4, characterized in that: The liquid storage assembly (4) comprises an annular liquid storage tank (41) located above the pressing plate (31), a plurality of support legs are arranged on the bottom outer wall of the annular liquid storage tank (41) along the circumferential direction, the bottom ends of the support legs are fixedly connected to the pressing plate (31), a multi-section telescopic tube (42) for solution feeding is installed on the top shell wall of the annular liquid storage tank (41), the top end of the multi-section telescopic tube (42) passes through the through hole on the left side and is connected to the guide tube, a discharge pipe (43) for solution discharge is arranged on the bottom shell wall of the annular liquid storage tank (41), the bottom end of the discharge pipe (43) passes through the pressing plate (31), and a control valve is also arranged on the discharge pipe (43).

6. A filtering device for cleaning impurities in the dichloronicotinic acid preparation process according to claim 3, characterized in that: The knocking assembly (5) comprises an elliptical plate (51) arranged on the circular tube (23), an annular groove is provided on the peripheral wall of the elliptical plate (51), a plurality of sliders are slidably connected in the annular groove, a moving rod (52) is installed on the outer wall of each slider, a traction rope is provided on the side of the moving rod (52) away from the slider, and a knocking rod (53) for knocking the pressure plate (31) is bound to the bottom end of the traction rope; Two straight plates (54) are sleeved on each moving rod (52), and the top ends of the straight plates (54) are fixedly connected to the top inner wall of the outer shell (11). Each traction rope is sleeved on a restraining plate (55), and the top ends of the restraining plates (55) are also fixedly connected to the top inner wall of the outer shell (11).

7. The filtering device for removing impurities in the dichloronicotinic acid preparation process according to claim 3, characterized in that: The driving mechanism (6) comprises a motor (61) mounted on the top outer wall of the housing (11) by means of screws, a transmission shaft being mounted on the output end of the motor (61), the bottom end of the transmission shaft passing through the through hole on the right side and being mounted with a driving gear (62), a side edge of the driving gear (62) being provided with a gear ring (63) meshing therewith, the gear ring (63) being fixedly connected to the circular tube (23).

8. The filtering device for cleaning impurities in the dichloronicotinic acid preparation process according to claim 4, characterized in that: The collecting component (8) comprises a collecting bin (81), a U-shaped rod (82), a supporting assembly (83), a lifting cylinder (84), a linkage assembly (85) and a pushing assembly (86), wherein the U-shaped rod (82) comprises two, which are respectively arranged on both sides of the top of the collecting bin (81), and the collecting bin (81) is arranged on a transverse plate (15); the supporting assembly (83) comprises a supporting plate (831) which is symmetrically arranged inside the collecting bin (81); the bottom of each supporting plate (831) is symmetrically arranged front and back; the bottom ends of the plurality of lifting rods (832) all penetrate the corresponding shell wall of the collecting bin (81) and are commonly connected to a frame (833); the lifting cylinder (84) comprises two, which are symmetrically arranged on the bottom shell wall of the transverse plate (15), and the output ends of the lifting cylinders (84) are all installed on the frame (833); The linkage assembly (85) comprises a U-shaped seat symmetrically arranged on the bottom shell wall of the frame (833), each U-shaped seat is movably connected to a support rod (851) via a latch, one end of the support rod (851) away from the U-shaped seat is movably connected to a carrier via a latch, a slide plate (852) is installed on the side wall of the carrier, a rack (853) is arranged on the front end side wall of the slide plate (852), a driven gear (854) meshing with the rack (853) is arranged on the front side of the rack (853), and the bottom of the slide plate (852) is slidably connected to the bottom inner wall of the shell (11), and a plurality of driven gears (854) are respectively installed on the bottom ends of corresponding pin shafts; The pushing assembly (86) also includes two, which are respectively arranged on both sides of the collection bin (81). The pushing assembly (86) includes a guide rod (861) located on the side of the collection bin (81). Support seats are installed at both ends of the guide rod (861). The support seats are fixedly connected to the corresponding side walls of the collection bin (81) by bolts, and a sliding sleeve and a return spring are sleeved on the guide rod (861). The return spring includes two, which are respectively located on the front and rear sides of the sliding sleeve. A pushing frame (862) for pushing against the filter box (9) is integrally arranged on the inner wall of the sliding sleeve, and a contact rod (863) is installed on the outer wall of the sliding sleeve. A push piece (864) is provided on the front side of the contact rod (863). The push piece (864) is in movable contact with the contact rod (863), and the top of the push piece (864) is fixedly connected to the lifting assembly (3) by bolts.

9. A filtering device for cleaning impurities in the dichloronicotinic acid preparation process according to claim 8, characterized in that: The filter box (9) comprises a box body (91) located on a supporting plate (831), a filter plate (92) being mounted on the bottom inner wall of the box body (91) by means of screws, and L-shaped plates (93) being fixedly connected to both sides of the top of the box body (91), the L-shaped plates (93) being in sliding contact with the U-shaped rods (82).

10. The filtering device for removing impurities in the dichloronicotinic acid preparation process according to claim 8, characterized in that: The discharge assembly (10) comprises a notch formed in the bottom shell wall of the collection bin (81); a collection box (101) located on the bottom outer wall of the collection bin (81) is installed around the bottom of the notch by bolts; a discharge hole is formed on the bottom shell wall of the collection box (101); a sewage discharge pipe extending to the outside of the housing (11) is installed in the discharge hole; a blocking plate (102) for blocking the discharge hole is slidably connected to the inside of the collection box (101); the rear side of the blocking plate (102) passes through the corresponding shell wall of the collection box (101) and is installed with an ear plate (104); an extension piece (103) is provided on the ear plate (104); a convex plate (105) is integrally provided on the front side of the bottom of the collection box (101); the convex plate (105) and the ear plate (104) are connected via a spring telescopic rod group (106); The extension piece (103) comprises an extension plate which is symmetrically arranged on the back shell wall of the ear plate (104), and the two extension plates are connected by a round rod, wherein the round rod is in movable contact with the extrusion piece (36).

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