Pedal type negative pressure dredging device

Abstract

The utility model relates to the technical field of catheter dredging, and discloses a pedal type negative pressure dredging device which comprises a pedal type blast pump, a three-way pipe, a first dredging pipe and a second dredging pipe, and the three ends of the three-way pipe are communicated with the pedal type blast pump, one end of the first dredging pipe and one end of the second dredging pipe respectively. The other end of the first dredging pipe is used for being communicated with a connecting guide pipe, a first filtering mechanism and a first one-way valve are arranged on the first dredging pipe at intervals in the direction from the first dredging pipe to the second dredging pipe, and a second one-way valve is arranged on the second dredging pipe. The problems of difficulty in dredging and low dredging efficiency of the circulating water pipe in the cigarette workshop in the prior art are solved.

Description

Technical Field

[0001] This utility model relates to the field of catheter unblocking technology, and in particular to a foot-operated negative pressure unblocking device. Background Technology

[0002] Currently, the temperature and humidity requirements of the on-site environment are becoming increasingly important in the cigarette production process. After long-term operation, the cooling water and chilled water circulation systems of cigarette factory refrigeration equipment are prone to accumulating dirt and deposits, which can easily lead to blockages in the connecting pipes of pressure gauges and thermometers installed on the pipelines. This can result in inaccurate reflection of the equipment's operating status, affecting the control and regulation of the refrigeration equipment, and ultimately increasing the energy consumption of the refrigeration system.

[0003] According to relevant data, there are currently no dedicated tools on the market for connecting pressure gauges to unblock circulating water pipes. Furthermore, most existing tools are designed for unblocking air conditioning or sewage pipes, lacking specificity. Currently, workshop circulating water pipes suffer from difficult and inefficient unblocking. Therefore, there is a need to design a device for connecting pressure gauges to unblock circulating water pipes. Utility Model Content

[0004] The purpose of this invention is to provide a foot-operated negative pressure unblocking device to solve the problems of difficult unblocking and low unblocking efficiency of circulating water pipes in cigarette workshops in the prior art.

[0005] This utility model solves the above-mentioned technical problems through the following technical means: a foot-operated negative pressure unblocking device, including a foot-operated air pump, a three-way pipe, a first unblocking pipe and a second unblocking pipe, wherein the three ends of the three-way pipe are respectively connected to the foot-operated air pump, one end of the first unblocking pipe and one end of the second unblocking pipe, and the other end of the first unblocking pipe is used to connect to a connecting conduit. A first filter mechanism and a first one-way valve are provided at intervals from the first unblocking pipe to the second unblocking pipe, and a second one-way valve is provided on the second unblocking pipe.

[0006] Furthermore, a third unclog pipe is provided between the first unclog pipe and the connecting conduit. The first filtration mechanism includes a first filter box, which is hollow inside. The end of the first unclog pipe away from the tee pipe is connected to one end of the first filter box. One end of the third unclog pipe is rotatably installed at the other end of the first filter box, and the other end is provided with a threaded joint.

[0007] Furthermore, the first filter box is provided with a first filter plate and a second filter plate at intervals along its length. The top of the first filter box has two through slots corresponding to the two filter plates. Both through slots are connected to the inside of the first filter box. The first filter plate and the second filter plate have the same structure. The two filter plates are respectively inserted into the first filter box through the corresponding through slots. The first filter plate is provided with a filter screen plate, and the second filter plate is provided with a nylon filter screen.

[0008] Furthermore, a locking assembly is provided between the first filter plate and the first filter box. The side wall of the through groove is provided with an inwardly recessed mounting groove in the horizontal direction. The locking assembly is located in the mounting groove. The locking assembly includes a locking rod and a first spring. One end of the first spring is connected to the inner side wall of the mounting groove away from the through groove, and the other end is connected to one end of the locking rod. The locking rod is slidably engaged with the mounting groove. The other end of the locking rod extends out of the mounting groove and contacts the outer side wall of the first filter plate. The outer side wall of the first filter plate is provided with a slot that engages with the locking rod.

[0009] Furthermore, the end of the locking rod near the through groove is provided with a pressing slope for pressing against the first filter plate, and the bottom of the outer wall of the first filter plate is provided with an arc-shaped chamfer structure.

[0010] Furthermore, the inner wall of the first filter box is provided with two positioning grooves. When the first filter plate is inserted into the first filter box, both sides of the first filter plate are engaged in the two positioning grooves. The bottom wall of the positioning groove is provided with a support component, which includes a support block and a third spring. One end of the third spring is fixed to the bottom of the positioning groove, and the other end is fixed to the bottom of the support block. The support block can slide in the positioning groove. When the first filter plate is inserted into the first filter box, the arc-shaped chamfered structure of the first filter plate is supported on the support block.

[0011] Furthermore, there are two locking assemblies, which are symmetrically distributed on both sides of the first filter plate. The first filter box has cavities on both sides of the locking rod. Each cavity is provided with an arc-shaped spring piece with the inner side of the arc-shaped spring piece facing vertically downward. A crossbar is fixed on the locking rod. The interior of the first filter box has an elongated groove along the axial direction of the locking rod for the crossbar to pass through, and the fixed position of the crossbar is adjustable. The elongated groove connects the cavity to the mounting groove. The two ends of the crossbar pass through the elongated groove and are located in the cavity. The two ends of the arc-shaped spring piece are fixedly connected to one end of the two crossbars located in the cavity on the same side.

[0012] Furthermore, the first filter box is provided with control components, there are two control components, each corresponding to an arc-shaped spring. Each control component includes a pressing rod and a second spring. The first filter box has a through hole at the top of the arc-shaped spring, which penetrates the top of the first filter box. The pressing rod is movably inserted into the through hole. The bottom end of the pressing rod is fixedly connected to the top of the arc-shaped spring, and the top end protrudes outside the first filter box.

[0013] Furthermore, the first filter box has an installation cavity circumferentially formed on the pressing rod, and a fixing ring is fixedly sleeved on the pressing rod. The fixing ring and the second spring are both located inside the installation cavity. One end of the second spring is connected to the fixing ring, and the other end is connected to the inner side wall of the installation cavity. The second spring causes the pressing rod to tend to protrude from the first filter box.

[0014] Furthermore, a second filtration mechanism is provided on the second unblocking pipe. The second filtration mechanism includes a second filter box and a third filter plate. The third filter plate is detachably installed in the second filter box and is provided with an activated carbon adsorption layer.

[0015] The beneficial effects of this utility model are as follows: The operator places the unblocking device on a flat surface, connects the first unblocking pipe to the connecting conduit, and uses a foot-operated air pump. The first one-way valve allows gas to enter the three-way pipe from the connecting conduit, and the gas cannot flow back. The second one-way valve allows gas to enter the outer end of the second unblocking pipe from the three-way pipe and then be discharged, and the gas cannot flow back into the three-way pipe. Repeated cycles can continuously extract gas from the connecting conduit until the blockage inside the connecting conduit is sucked out by negative pressure and filtered and intercepted by the first filter mechanism, thus completing the pipe unblocking. The device is lightweight, simple, sturdy, and practical. The whole process achieves the purpose of saving labor and increasing efficiency, realizing the purpose of special unblocking of pressure gauge conduits in circulating water pipes. Attached Figure Description

[0016] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0017] Figure 1 This is a schematic diagram of the structure of a foot-operated negative pressure unblocking device according to this utility model.

[0018] Figure 2 yes Figure 1 Top view.

[0019] Figure 3 This is a partial structural schematic diagram of a foot-operated negative pressure unblocking device according to this utility model.

[0020] Figure 4 This utility model discloses a schematic diagram of the structure of the first and second filter plates in a foot-operated negative pressure unblocking device.

[0021] Figure 5 yes Figure 4 A magnified structural diagram of point A in the middle.

[0022] Figure 6 yes Figure 4 A magnified structural diagram at point B in the middle.

[0023] Figure 7 This is a cross-sectional view of the first filter box in this utility model.

[0024] Figure 8 yes Figure 7 A magnified structural diagram at point C.

[0025] Figure 9 yes Figure 7 A magnified structural diagram at point D.

[0026] In the above attached diagram: 1. Foot-operated air pump; 2. T-connector; 3. First unblocking pipe; 4. Second unblocking pipe; 5. Third unblocking pipe; 6. First filter box; 7. Threaded connector; 8. Nozzle; 9. First check valve; 10. Second check valve; 11. Second filter box; 12. First filter plate; 13. Second filter plate; 14. Through groove; 15. Pressing rod; 16. Mounting cavity; 17. Fixing ring; 18. Second spring; 19. Arc-shaped spring piece; 20. Crossbar; 21. Locking rod; 22. First spring; 23. Slot; 24. Mounting slot; 25. Filter screen; 26. Nylon filter screen; 27. Protrusion; 28. Third spring; 29. ​​Positioning slot; 30. Support block; 31. Extrusion slope; 32. Third filter plate. Detailed Implementation

[0027] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can understand the advantages and effects of this utility model from the content disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are for illustrative purposes only and represent schematic diagrams, not actual pictures. They should not be construed as limiting the utility model. To better illustrate the embodiments of this utility model, some components in the figures may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable for those skilled in the art that some well-known mechanisms and their descriptions may be omitted in the figures.

[0028] In the figures of this utility model embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figure, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the figures are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances. In the description of this application, terms such as "first", "second", etc. are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] In related technologies, it has been found in practical use that the dirt and deposits inside the connecting conduit mainly include solid deposits, sticky soft scale, and suspended matter. Among them, solid deposits include layered hard scale formed by the gradual crystallization of inorganic salts (such as calcium carbonate) on the pipe wall, as well as particles formed by the gradual accumulation of corrosion products (such as iron oxide particles) or silt due to gravity settling. Sticky soft scale includes biological slime formed by microorganisms and their secretions, which adheres to the pipe wall or instrument interface.

[0030] like Figure 1-9 As shown in the figure, this utility model embodiment proposes a foot-operated negative pressure unblocking device, including a foot-operated air pump 1, a three-way pipe 2, a first unblocking pipe 3, and a second unblocking pipe 4. The three ends of the three-way pipe 2 are respectively connected to the air nozzle connector of the foot-operated air pump 1, one end of the first unblocking pipe 3, and one end of the second unblocking pipe 4. In this embodiment, the structure of the foot-operated air pump 1 has been fully disclosed in the prior art, and will not be described in detail here. The other end of the first unblocking pipe 3 is used to connect with the connecting conduit. A first filter mechanism and a first one-way valve 9 are provided at intervals from the first unblocking pipe 3 to the second unblocking pipe 4. The first one-way valve 9 allows gas to enter the three-way pipe 2 from the connecting conduit and prevents the gas from flowing back. A second one-way valve 10 is provided on the second unblocking pipe 4. The second one-way valve 10 allows gas to enter the outer end of the second unblocking pipe 4 from the three-way pipe 2 and be discharged, and prevents the gas from flowing back into the three-way pipe 2. In this way, by repeatedly stepping on the foot-operated air pump 1, the gas inside the connecting conduit is continuously drawn out until the blockage inside the connecting conduit is sucked out by the negative pressure and filtered and intercepted by the first filter mechanism, and the pipe unblocking is completed.

[0031] A third unclog pipe 5 is provided between the first unclogging pipe 3 and the connecting conduit. The first filtration mechanism includes a first filter box 6, which is a rectangular parallelepiped with a hollow interior. The end of the first unclogging pipe 3 away from the tee pipe 2 is connected to one end of the first filter box 6. One end of the third unclog pipe 5 is rotatably mounted on the other end of the first filter box 6 through a sealed bearing. The other end of the third unclog pipe 5 is fixedly provided with an external threaded connector 7, which can be connected to the interface of the connecting conduit through the external threaded connector 7. Then, by opening the switch valve of the connecting conduit, the connecting conduit can be connected to the third unclog pipe 5.

[0032] The first filter box 6 is provided with a first filter plate 12 and a second filter plate 13 spaced apart along its length. The top of the first filter box 6 has two through slots 14 corresponding to the two filter plates, and both through slots 14 are connected to the inside of the first filter box 6. The first filter plate 12 and the second filter plate 13 have the same structure. The first filter plate 12 is located at the end of the first filter box 6 near the third unblocking pipe 5, and the second filter plate 13 is located at the end of the first filter box 6 near the first unblocking pipe 3. The two filter plates are respectively inserted into the first filter box 6 through the corresponding through slots 14. The first filter screen 25 is U-shaped. When inserted, the first filter screen 25 is inserted into the first filter box 6 with the opening facing down. The filter screen 25 is provided in the opening of the first filter plate 12. The filter screen 25 is a stainless steel metal filter screen used to intercept hard particles (such as iron oxide debris and calcium carbonate particles). The second filter plate 13 is provided in the opening of the second filter plate 13 with a nylon filter screen 26 used to intercept and adsorb sticky biofilm and small suspended matter.

[0033] A locking assembly is provided between the first filter plate 12 and the first filter box 6. A recessed mounting groove 24 is provided horizontally on the side wall of the through groove 14. The locking assembly is located within the mounting groove 24 and includes a locking rod 21 and a first spring 22. One end of the first spring 22 is fixedly connected to the inner side wall of the mounting groove 24 away from the through groove 14, and the other end is fixedly connected to one end of the locking rod 21. The locking rod 21 slides within the mounting groove 24, and the other end extends out of the mounting groove 24 and slides against the outer side wall of the first filter plate 12. The side wall is provided with a slot 23 that cooperates with the locking rod 21. When the first filter plate 12 is fully inserted into the first filter box 6, the outer side wall of the first filter plate 12 fits against the inner side wall of the through groove 14 to form a seal. The locking rod 21 is inserted into the slot 23 to limit the first filter plate 12 in the vertical direction. In this embodiment, in order to increase the sealing performance between the first filter plate 12 and the through groove 14, a rubber sealing layer can be provided on the inner side wall of the through groove 14. When the first filter plate 12 is inserted, the outer side wall of the first filter plate 12 is in close contact with the rubber sealing layer.

[0034] The locking rod 21 has a pressing bevel 31 at one end near the through groove 14 for pressing against the first filter plate 12. The bottom of the outer wall of the first filter plate 12 has an arc-shaped chamfer structure. The inner wall of the first filter box 6 has two positioning grooves 29. When the first filter plate 12 is inserted into the first filter box 6, both sides of the first filter plate 12 are engaged in the two positioning grooves 29. The bottom wall of the positioning groove 29 is provided with a support assembly, which includes a support block 30 and a third spring 28. One end of the third spring 28 is fixed to the bottom of the positioning groove 29, and the other end is fixed to the bottom of the support block 30. The support block 30 can slide in the positioning groove 29. When the first filter plate 12 is inserted into the first filter box 6, the arc-shaped chamfer structure of the first filter plate 12 is supported on the support block 30 and presses against the third spring 28. In this embodiment, a clearance portion is provided on the outer side of the ends of the two wings of the first filter plate 12. An arc-shaped chamfer structure is provided at the position of the clearance portion for cooperation with the support component. The positioning groove 29 cooperates with the through groove 14 to limit the first filter plate 12 in the horizontal direction. The extrusion slope 31 facilitates the insertion of the first filter plate 12 into the first filter box 6.

[0035] There are two locking assemblies, symmetrically distributed on both sides of the first filter plate 12. The first filter box 6 has cavities (not shown in the figure) on both sides of the locking rod 21. Each cavity contains a movable arc-shaped spring piece 19, with its inner side facing vertically downwards. A crossbar 20 is fixed to the locking rod 21, with its axis perpendicular to the axis of the locking rod 21. The interior of the first filter box 6 has an elongated groove (not shown in the figure) along the axial direction of the locking rod 21, through which the crossbar 20 passes and whose fixed position is adjustable. The elongated groove connects the cavities... The mounting groove 24 is connected to the elongated groove 24. There are two elongated grooves, which are symmetrically distributed on both sides of the locking rod 21. The two ends of the crossbar 20 pass through the elongated groove 14 and are located in the cavity. The two ends of the arc-shaped spring piece 19 are fixedly connected to the ends of the two crossbars 20 located in the cavity on the same side. In this embodiment, by pressing down on the two arc-shaped spring pieces 19 at the same time, the two ends of the arc-shaped spring pieces 19 drive the two crossbars 20 away from each other, so that the two locking rods 21 leave the slot 23 at the same time, thereby releasing the restriction on the first filter plate 12 in the vertical direction.

[0036] The first filter box 6 is equipped with two control components, each corresponding to a curved spring 19. Each control component includes a pressing rod 15 and a second spring 18. A through hole is formed at the top of the curved spring 19, penetrating the top of the first filter box 6. The pressing rod 15 is movably inserted into the through hole, with its bottom end fixedly connected to the top of the curved spring 19 and its top end protruding outside the first filter box 6. A mounting cavity 16 is formed circumferentially around the pressing rod 15, extending vertically. A fixing ring 17 is fixedly fitted onto the pressing rod 15. Both the fixing ring 17 and the second spring 18 are located within the mounting cavity 16. One end of the second spring 18 is fixedly connected to the fixing ring 17, and the other end is fixedly connected to the inner wall of the mounting cavity 16. The second spring 18 causes the pressing rod 15 to tend to protrude from the first filter box 6. In this embodiment, pressing both pressing rods 15 simultaneously will cause the two arc-shaped spring pieces 19 to press down at the same time and release the restriction on the first filter plate 12 in the vertical direction, so that the first filter plate 12 can be taken out from the first filter box 6. The installation and removal of the first filter plate 12 is convenient and quick. The second spring 18 can help the arc-shaped spring pieces 19 and pressing rods 15 to reset, which is convenient for the next use.

[0037] The second dredging pipe 4 is equipped with a second filtration mechanism, which includes a second filter box 11 and a third filter plate 32. The third filter plate 32 is detachably installed in the second filter box 11 and is provided with an activated carbon adsorption layer, which can adsorb odor substances produced by microbial metabolism.

[0038] In the above embodiments, the second filter box 11 has a similar structure to the first filter box 6, and the third filter plate 32 has the same structure as the first filter plate 12. Locking components, support components, and control components are also provided between the second filter plate 13 and the first filter box 6, and between the third filter plate 32 and the second filter box 11, so that the installation and removal of the second filter plate 13 on the first filter box 6 and the installation and removal of the third filter plate 32 on the second filter box 11 are the same as the installation and removal of the first filter plate 12 on the first filter box 6.

[0039] In the above embodiment, the free end of the second unblocking pipe 4 is provided with a nozzle 8 to facilitate the smooth flow of gas and liquid; both sides of the top of the three filter plates are provided with protrusions 27 to facilitate inserting the filter plates into the filter box and removing the filter plates from the filter box.

[0040] Working principle:

[0041] In use, place the device on the ground and connect it to the interface of the connecting pipe to be unclogged via the external threaded connector 7. Open the valve to connect the connecting pipe to the third unclogging pipe 5. By stepping on the foot-operated air pump 1, the first one-way valve 9 allows gas to enter the three-way pipe 2 from the connecting pipe, preventing backflow. The second one-way valve 10 allows gas to enter the outer end of the second unclogging pipe 4 from the three-way pipe 2 and then exit, preventing backflow into the three-way pipe 2. Repeated cycles continuously extract gas from the connecting pipe. The process continues until the blockage inside the connecting pipe is drawn out by negative pressure and filtered and intercepted by the first filtration mechanism. In the first filter box 6, the first filter plate 12 intercepts hard particles (such as iron oxide fragments and calcium carbonate particles), and the second filter plate 13 intercepts and adsorbs sticky biofilm and tiny suspended matter. At the same time, the gas and liquid drawn in are finally discharged into the water receiving tank through the nozzle 8. In the second filter box 11, the activated carbon adsorption layer adsorbs odor substances produced by microbial metabolism, preventing odors from emanating from the cigarette workshop and affecting the working environment. The pipe dredging is then completed. Since there are dozens of connecting conduits that need to be cleaned, the three filter plates need to be cleaned in a timely manner to avoid blockage. By pressing the two pressing rods 15 corresponding to the filter plates at the same time, the pressing rods 15 press down the arc-shaped spring 19. The arc-shaped spring 19 drives the two horizontal rods 20 and the two locking rods 21 to move away from each other. Both locking rods 21 are out of the slot 23. Under the action of the third spring 28 and the support block 30, the filter plate automatically bounces up a distance. The slot 23 of the filter plate is misaligned with the locking rod 21. At this time, the filter plate can be directly removed. After cleaning, align the filter plate with the through groove 14 and press down hard. The side wall of the filter plate squeezes the squeezing slope 31 of the locking rod 21, so that the locking rod 21 retracts into the installation groove 24 until the slot 23 of the filter plate is aligned with the locking rod 21. Under the action of the first spring 22, the locking rod 21 is locked into the slot 23, completing the installation of the filter plate. The device is lightweight, simple, sturdy, and practical. The entire process is labor-saving and efficient, achieving the purpose of unblocking the pressure gauge conduit of circulating water pipes. At the same time, through multi-layer composite filtration, it adopts a combination of "coarse filtration + fine filtration" to target the blockage inside the connecting conduit, resulting in good filtration effect. There is no odor in the workshop during the treatment process, and the filter screen can be replaced and cleaned without tools, enabling quick disassembly and assembly of the filter plate.

[0042] The above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model. Technologies, shapes, and structural parts not described in detail in this utility model are all known technologies.

Claims

1. A foot-operated negative pressure unblocking device, characterized in that: It includes a foot-operated air pump, a three-way pipe, a first unblocking pipe, and a second unblocking pipe. The three ends of the three-way pipe are respectively connected to the foot-operated air pump, one end of the first unblocking pipe, and one end of the second unblocking pipe. The other end of the first unblocking pipe is used to connect to a connecting conduit. A first filter mechanism and a first one-way valve are provided on the first unblocking pipe at intervals from the first unblocking pipe to the second unblocking pipe. A second one-way valve is provided on the second unblocking pipe.

2. The foot-operated negative pressure unblocking device according to claim 1, characterized in that: A third unclog pipe is provided between the first unclog pipe and the connecting conduit. The first filtration mechanism includes a first filter box, which is hollow inside. The end of the first unclog pipe away from the tee pipe is connected to one end of the first filter box. One end of the third unclog pipe is rotatably installed at the other end of the first filter box, and the other end is provided with a threaded joint.

3. The foot-operated negative pressure unblocking device according to claim 2, characterized in that: The first filter box is provided with a first filter plate and a second filter plate at intervals along its length. The top of the first filter box has two through slots corresponding to the two filter plates. Both through slots are connected to the inside of the first filter box. The first filter plate and the second filter plate have the same structure. The two filter plates are respectively inserted into the first filter box through the corresponding through slots. The first filter plate is provided with a filter screen plate, and the second filter plate is provided with a nylon filter screen.

4. The foot-operated negative pressure unblocking device according to claim 3, characterized in that: A locking assembly is provided between the first filter plate and the first filter box. The side wall of the through groove has an inwardly recessed mounting groove in the horizontal direction. The locking assembly is located in the mounting groove. The locking assembly includes a locking rod and a first spring. One end of the first spring is connected to the inner side wall of the mounting groove away from the through groove, and the other end is connected to one end of the locking rod. The locking rod is slidably engaged with the mounting groove. The other end of the locking rod extends out of the mounting groove and contacts the outer side wall of the first filter plate. The outer side wall of the first filter plate has a slot that engages with the locking rod.

5. A foot-operated negative pressure unblocking device according to claim 4, characterized in that: The locking rod has a pressing bevel near the through groove for pressing against the first filter plate, and the bottom of the outer wall of the first filter plate has an arc-shaped chamfer structure.

6. A foot-operated negative pressure unblocking device according to claim 5, characterized in that: The inner wall of the first filter box is provided with two positioning grooves. When the first filter plate is inserted into the first filter box, the two sides of the first filter plate are engaged in the two positioning grooves. The bottom wall of the positioning groove is provided with a support component, which includes a support block and a third spring. One end of the third spring is fixed to the bottom of the positioning groove, and the other end is fixed to the bottom of the support block. The support block can slide in the positioning groove. When the first filter plate is inserted into the first filter box, the arc-shaped chamfered structure of the first filter plate is supported on the support block.

7. A foot-operated negative pressure unblocking device according to claim 4, characterized in that: There are two locking assemblies, which are symmetrically distributed on both sides of the first filter plate. The first filter box has cavities on both sides of the locking rod. Each cavity is provided with an arc-shaped spring piece with the inner side of the arc-shaped spring piece facing vertically downward. A crossbar is fixed on the locking rod. The interior of the first filter box has an elongated groove along the axial direction of the locking rod for the crossbar to pass through, and the fixed position of the crossbar is adjustable. The elongated groove connects the cavity to the mounting groove. The two ends of the crossbar pass through the elongated groove and are located in the cavity. The two ends of the arc-shaped spring piece are fixedly connected to one end of the two crossbars located in the cavity on the same side.

8. A foot-operated negative pressure unblocking device according to claim 7, characterized in that: The first filter box is provided with two control components, each corresponding to a curved spring. Each control component includes a pressing rod and a second spring. The first filter box has a through hole at the top of the curved spring, which penetrates the top of the first filter box. The pressing rod is movably inserted into the through hole. The bottom end of the pressing rod is fixedly connected to the top of the curved spring, and the top end protrudes outside the first filter box.

9. A foot-operated negative pressure unblocking device according to claim 8, characterized in that: The first filter box has an installation cavity circumferentially formed on the pressing rod. A fixing ring is fixedly sleeved on the pressing rod. The fixing ring and the second spring are both located inside the installation cavity. One end of the second spring is connected to the fixing ring, and the other end is connected to the inner side wall of the installation cavity. The second spring causes the pressing rod to tend to protrude from the first filter box.

10. A foot-operated negative pressure unblocking device according to claim 1, characterized in that: The second unblocking pipe is equipped with a second filtration mechanism, which includes a second filter box and a third filter plate. The third filter plate is detachably installed inside the second filter box and is provided with an activated carbon adsorption layer.

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