Rapid detection device for water permeability of knapsack

Abstract

The invention relates to the technical field of water seepage performance detection, in particular to a backpack water seepage performance rapid detection device which comprises a detection box, an extrusion mechanism is arranged at the bottom of the inner wall of the detection box, a trowelling mechanism is arranged on the extrusion mechanism, a pressing mechanism is arranged at the top of the inner wall of the detection box, and a filtering mechanism is arranged on the outer wall of the detection box. The extrusion mechanism comprises a collection pipe fixedly penetrating through the bottom of the inner wall of the detection box, the top end of the collection pipe is fixedly connected with a placement ring, and a storage cavity for storing sealant is formed in the placement ring; according to the device, the smearing efficiency can be improved, sealant can be uniformly smeared around a to-be-tested area through the arrangement of the trowelling mechanism, so that the consistent smearing thickness is ensured, the sealing effect is further ensured, the accuracy of water seepage performance detection is improved, and under the cooperation of the structure, the detection work of the terylene knapsack can be rapidly completed, and the detection efficiency is improved. The detection efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of water seepage performance detection, and in particular to a backpack water seepage performance rapid detection device. Background Art

[0002] A polyester backpack refers to a backpack made of polyester (polyester fiber) as the main fabric. Polyester, also known as polyester fiber, is a synthetic fiber obtained by spinning polyester formed by the condensation of organic dibasic acids and diols. The polyester backpack water permeability rapid detection device is a special equipment specially used to quickly detect the water permeability of polyester backpacks. The core function of the device is to quickly and accurately detect the water permeability of polyester backpacks, that is, to evaluate the backpack's protective ability when it is penetrated by water.

[0003] At present, in the prior art, when testing the water permeability of polyester backpacks, a layer of sealant needs to be applied to the area to be tested so that the test is carried out within a specified range. The sealant needs to be applied manually, and the uniformity of the application cannot be guaranteed during the manual application process, resulting in inconsistent thickness, which in turn leads to a sealing effect and affects the accuracy of the water permeability test.

[0004] In addition, when producing polyester backpacks, the polyester fabric needs to be cut, and some fine broken lines will be produced in the cutting process. In order to save time and cost, they are not cleaned up, resulting in the backpack being stained with cleaned fine broken lines. When the water used for testing is recycled, some fine broken lines on the polyester backpack will be taken away, resulting in the water containing fine broken lines. Therefore, during the test, the fine broken lines in the water will adhere to the side to be tested, which will affect the water flow rate and mislead the test results. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the background technology and to propose a backpack water seepage performance rapid detection device.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is: a backpack water seepage performance rapid detection device, comprising a detection box, an extrusion mechanism is provided at the bottom of the inner wall of the detection box, a smoothing mechanism is provided on the extrusion mechanism, a pressing mechanism is provided at the top of the inner wall of the detection box, and a filtering mechanism is provided on the outer wall of the detection box;

[0007] The extrusion mechanism comprises a collecting tube fixedly passing through the bottom of the inner wall of the detection box, a placing ring is fixedly connected to the top of the collecting tube, a storage cavity for storing sealant is provided inside the placing ring, a circular notch is provided at the top of the placing ring, an annular groove is provided at the bottom of the circular notch, a fixing ring is rotatably connected to the bottom of the annular groove, an annular notch is provided on the outer wall of the fixing ring, a plurality of circular openings are penetrated at the top of the fixing ring and extend into the annular notch, the storage cavity and the annular groove are connected by a connecting hole, and the sealant in the storage cavity enters the annular notch through the connecting hole and is extruded from the circular opening;

[0008] The smoothing mechanism includes a rotating groove opened on the outer wall of the annular groove, one side of the rotating groove is connected to a circular groove, the bottom end of the placement ring is fixedly connected to a motor, the driving end of the motor is fixedly connected to a driving shaft and extends into the circular groove, the other end of the driving shaft is fixedly connected to a gear, the outer diameter of the gear is meshed with an external gear ring, the external gear ring and the fixed ring are fixedly connected, the motor rotates with the fixed ring through the driving shaft, the gear and the external gear ring, and the sealant is evenly smoothed.

[0009] Preferably, the extrusion mechanism further comprises an extrusion ring arranged at the top of the storage cavity, the bottom end of the extrusion ring is symmetrically fixedly connected to lifting columns, and the bottom ends of two lifting columns are fixedly connected to slide plates.

[0010] Preferably, the extrusion mechanism further comprises slide grooves provided on both sides of the inner wall of the detection box, the two slide grooves and the two slide plates are respectively slidably connected, and a first spring is fixedly connected between the two groups of the slide grooves and the slide plates.

[0011] Preferably, the pressing mechanism includes a detection tube slidingly passing through the top of the detection box, a liquid level sensor fixedly passing through the top of the detection tube, a telescopic tube is provided on the outer wall of the detection tube, a support plate is symmetrically fixedly connected to the outer wall of the telescopic tube, and both support plates are slidably connected to the inner wall of the detection box.

[0012] Preferably, the bottom end of each support plate is fixedly connected with a circular column, and the circular column is arranged above the slide plate. Hydraulic rods are fixedly penetrated on both sides of the detection tube corresponding to the top of the detection box, and the two telescopic ends of the hydraulic rods are fixedly connected with the two support plates respectively.

[0013] Preferably, a telescopic notch is provided on the inner wall of the telescopic notch, a plurality of second springs are fixedly connected to the top of the telescopic notch, a ring plate is fixedly connected to the bottom ends of the plurality of second springs, the ring plate and the detection tube are fixedly connected, a limiting ring is fixedly connected to the bottom end of the telescopic tube, the limiting ring is arranged at the bottom end of the ring plate and leaves a distance between the detection tube.

[0014] Preferably, the filtering mechanism includes a water storage tank fixedly connected to the bottom end of the detection box and a water pump fixedly connected to one end of the detection box, the water pump and the water storage tank are connected by a pipeline, the top of the detection box is fixedly connected to a filter box, the filter box and the water pump are connected by a pipeline, and the filter box and the detection tube are connected by a hose.

[0015] Preferably, a cover plate is provided at the top of the filter box, a sealing groove is opened at the top of the filter box, a sealing rod matching the shape of the sealing groove is fixedly connected to the bottom of the cover plate, and a plurality of filter plates are fixedly connected to the inner side of the sealing rod corresponding to the bottom of the cover plate.

[0016] Preferably, both ends of the filter box are slidably penetrated by limit rods, and the ends of the two limit rods away from the filter box are fixedly connected to pull blocks, and the ends of the two pull blocks close to the filter box are fixedly connected to tension springs below the limit rods, and the two tension springs are fixedly connected to the filter box, and both ends of the sealing rod are provided with limit grooves that are compatible with the shape of the limit rods.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. Through the setting of the pressing mechanism, the polyester backpack can be initially fixed, and the polyester area to be tested can be stuck inside the placement ring. Then, the sealant can be squeezed out and applied around the area to be tested of the polyester backpack with the cooperation of the extrusion mechanism, avoiding the operation of manual application and improving the application efficiency. The setting of the smoothing mechanism can evenly apply the sealant around the area to be tested, thereby ensuring the consistency of the application thickness, thereby ensuring the sealing effect and improving the accuracy of the water permeability performance test. With the cooperation of the above structure, the detection of the polyester backpack can be completed quickly, and the detection efficiency can be improved.

[0019] 2. Through the setting of the filtering mechanism, the water after the test can be recycled, so as to save water resources, and the fine broken lines in the water can be filtered out after reuse, so as to avoid the fine broken lines adhering to the side to be tested during the detection process, and prevent misleading the test results. The filter plate can be disassembled and cleaned, so that it can be recycled and the subsequent test results can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an overall schematic diagram of a backpack water seepage performance rapid detection device of the present invention;

[0021] Figure 2 A backpack water seepage performance rapid detection device of the present invention Figure 1 Enlarged view of point A in the middle;

[0022] Figure 3It is a top view from another perspective of a backpack water seepage performance rapid detection device of the present invention;

[0023] Figure 4 A cross-sectional view of a detection tube of a backpack water seepage performance rapid detection device of the present invention;

[0024] Figure 5 This is a schematic diagram of the placement ring structure of a backpack water seepage performance rapid detection device of the present invention;

[0025] Figure 6 A cross-sectional view of a placement ring of a backpack water seepage performance rapid detection device according to the present invention;

[0026] Figure 7 It is a cross-sectional view from another angle of the placement ring of a backpack water seepage performance rapid detection device of the present invention;

[0027] Figure 8 This is a diagram showing the internal structure of a placement ring of a backpack water seepage performance rapid detection device of the present invention;

[0028] Fig. 9 This is a structural diagram of a filter box of a backpack water seepage performance rapid detection device of the present invention;

[0029] Fig.10 This is a schematic diagram of the disassembly of a filter box of a backpack water seepage performance rapid detection device of the present invention.

[0030] In the figure: 1, detection box; 2, collection tube; 3, placement ring; 4, storage chamber; 5, circular notch; 6, annular groove; 7, fixing ring; 8, annular notch; 9, circular opening; 10, connecting hole; 11, rotating groove; 12, circular groove; 13, motor; 14, driving shaft; 15, gear; 16, outer gear ring; 17, extrusion ring; 18, lifting column; 19, slide plate; 20, slide groove; 21, first spring; 2 2. Detection tube; 23. Telescopic tube; 24. Support plate; 25. Round column; 26. Hydraulic rod; 27. Telescopic notch; 28. Second spring; 29. ​​Ring plate; 30. Limiting ring; 31. Water storage tank; 32. Water pump; 33. Filter box; 34. Hose; 35. Cover plate; 36. Sealing groove; 37. Sealing rod; 38. Filter plate; 39. Limiting rod; 40. Pull block; 41. Tension spring; 42. Limiting groove. DETAILED DESCRIPTION

[0031] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0032] like Figure 1-Figure 10A backpack water seepage performance rapid detection device shown includes a detection box 1, an extrusion mechanism is provided at the bottom of the inner wall of the detection box 1, a smoothing mechanism is provided on the extrusion mechanism, a pressing mechanism is provided at the top of the inner wall of the detection box 1, and a filtering mechanism is provided on the outer wall of the detection box 1. The sealant can be quickly extruded and applied to the polyester backpack through the setting of the extrusion mechanism, the setting of the smoothing mechanism can evenly apply the sealant on the polyester backpack, the setting of the pressing mechanism can fix the polyester backpack, and the setting of the filtering mechanism can filter the recycled water;

[0033] like Figure 5-Figure 8 As shown, the extrusion mechanism includes a collecting tube 2 fixedly passing through the bottom of the inner wall of the detection box 1, a placing ring 3 is fixedly connected to the top of the collecting tube 2, a storage cavity 4 for storing sealant is provided inside the placing ring 3, a circular notch 5 is provided at the top of the placing ring 3, an annular groove 6 is provided at the bottom of the circular notch 5, a fixing ring 7 is rotatably connected to the bottom of the annular groove 6, an annular notch 8 is provided on the outer wall of the fixing ring 7, a plurality of circular openings 9 are penetrated at the top of the fixing ring 7 and extend into the annular notch 8, the storage cavity 4 and the annular groove 6 are connected by a connecting hole 10, and the sealant in the storage cavity 4 enters the annular notch 8 through the connecting hole 10 and is extruded from the circular opening 9;

[0034] like Figure 6-Figure 8 As shown, the smoothing mechanism includes a rotating groove 11 opened on the outer wall of the annular groove 6, one side of the rotating groove 11 is connected to a circular groove 12, a motor 13 is fixedly connected to the bottom end of the placement ring 3, a driving end of the motor 13 is fixedly connected to a driving shaft 14 and extends into the circular groove 12, a gear 15 is fixedly connected to the other end of the driving shaft 14, the outer diameter of the gear 15 is meshed with an outer gear ring 16, the outer gear ring 16 and the fixed ring 7 are fixedly connected, the motor 13 rotates with the fixed ring 7 through the driving shaft 14, the gear 15 and the outer gear ring 16, and the sealant is evenly smoothed.

[0035] like Figure 5-Figure 8 As shown, the extrusion mechanism also includes an extrusion ring 17 arranged at the top of the storage cavity 4, and the bottom end of the extrusion ring 17 is symmetrically fixedly connected to the lifting column 18, and the bottom end of the two lifting columns 18 is fixedly connected to the slide plate 19. The downward movement of the slide plate 19 can bring the lifting column 18 and the extrusion ring 17 downward, so that the sealant in the storage cavity 4 can be squeezed out and applied to the polyester backpack, which is convenient for subsequent testing and processing.

[0036] like Figure 1 , Figure 2 As shown, the extrusion mechanism also includes slide grooves 20 opened on both sides of the inner wall of the detection box 1, and the two slide grooves 20 are slidably connected to the two slide plates 19, and the first spring 21 is fixedly connected between the two sets of slide grooves 20 and the slide plates 19. The elastic reset effect of the first spring 21 can make the slide plate 19 at the top when not testing, so as to avoid squeezing the sealant when not testing and avoid wasting the sealant.

[0037] like Figure 1 , Figure 3 , Figure 4 As shown, the pressing mechanism includes a detection tube 22 that slides through the top of the detection box 1, a liquid level sensor is fixedly penetrated through the top of the detection tube 22, a telescopic tube 23 is arranged on the outer wall of the detection tube 22, and a support plate 24 is symmetrically fixedly connected to the outer wall of the telescopic tube 23, and both support plates 24 are slidably connected to the inner wall of the detection box 1. When the detection tube 22 is fixed on the polyester backpack for testing, water is injected into the detection tube 22 and monitored by the liquid level sensor until the entire detection tube 22 is filled, and then the water injection is stopped, and the time taken for the water source to penetrate is observed by the liquid level sensor, so as to know the water permeability of the polyester backpack.

[0038] like Figure 1 , Figure 4 As shown, the bottom ends of the two support plates 24 are fixedly connected with circular columns 25, which are arranged above the slide plate 19. The top of the detection box 1 corresponds to the detection tube 22 on both sides, and the hydraulic rods 26 are fixedly penetrated. The telescopic ends of the two hydraulic rods 26 are respectively fixedly connected to the two support plates 24. The hydraulic rods 26 can be controlled by a synchronous controller to move up and down synchronously, thereby ensuring that the movement is free from jamming. When the hydraulic rods 26 are started, the support plates 24 will move up and down, thereby squeezing the slide plate 19 with the circular columns 25, so that the slide plate 19 moves downward, so that the sealant can be squeezed out to complete the coating operation.

[0039] like Figure 4 As shown, a telescopic notch 27 is provided on the inner wall of the telescopic notch 27, a plurality of second springs 28 are fixedly connected to the top of the telescopic notch 27, a ring plate 29 is fixedly connected to the bottom of the plurality of second springs 28, the ring plate 29 is fixedly connected to the detection tube 22, and a limiting ring 30 is fixedly connected to the bottom of the telescopic tube 23, and the limiting ring 30 is arranged at the bottom of the ring plate 29 and a distance is left between the detection tube 22. The second spring 28 can continue to move downward after the detection tube 22 is fixed, thereby increasing the elastic force and causing the telescopic tube 23 to move downward, and the limiting ring 30 limits the ring plate 29 to prevent the ring plate 29 from leaving the range of the telescopic notch 27.

[0040] like Fig. 9 , Fig.10As shown, the filtering mechanism includes a water storage tank 31 fixedly connected to the bottom end of the detection box 1 and a water pump 32 fixedly connected to one end of the detection box 1. The water pump 32 and the water storage tank 31 are connected through a pipeline. A filter box 33 is fixedly connected to the top of the detection box 1. The filter box 33 and the water pump 32 are connected through a pipeline. The filter box 33 and the detection tube 22 are connected through a hose 34. The water in the water storage tank 31 can be pumped out by the water pump 32 and flow into the filter box 33, and then flow into the detection tube 22 through the hose 34 for water seepage performance detection.

[0041] like Fig.10 As shown, a cover plate 35 is provided at the top of the filter box 33, a sealing groove 36 is provided at the top of the filter box 33, a sealing rod 37 matching the shape of the sealing groove 36 is fixedly connected to the bottom of the cover plate 35, and a plurality of filter plates 38 are fixedly connected to the inner side of the sealing rod 37 corresponding to the bottom of the cover plate 35. The sealing groove 36 and the sealing rod 37 cooperate to achieve a sealing effect to prevent water from leaking out, and the plurality of filter plates 38 can perform multiple filtrations on the water to ensure that the polyester material in the water is fully filtered out and the subsequent detection results are guaranteed.

[0042] like Fig. 9 , Fig.10 As shown, both ends of the filter box 33 slide through the limit rod 39, and the ends of the two limit rods 39 away from the filter box 33 are fixedly connected with a pull block 40, and the ends of the two pull blocks 40 close to the filter box 33 are fixedly connected with a tension spring 41 corresponding to the lower side of the limit rod 39, and the two tension springs 41 are fixedly connected to the filter box 33, and both ends of the sealing rod 37 are provided with a limit groove 42 that matches the shape of the limit rod 39. The pull block 40 can move with the limit rod 39 to make it leave the limit groove 42 to complete the disassembly and cleaning of the filter plate 38. Later, during installation, the limit rod 39 can be stuck in the limit groove 42 under the elastic reset action of the tension spring 41 to complete the fixing of the cover plate 35.

[0043] Working principle: First, place the polyester backpack on the placement ring 3. At this time, the hydraulic rod 26 is controlled by the synchronous controller to be synchronously extended downward, thereby moving the support plate 24 downward and making the detection tube 22 contact the polyester backpack first, so that it is fixed in the circular notch 5. Then, the support plate 24 continues to move downward, and the circular column 25 contacts the slide plate 19 to move it downward, and compress the first spring 21. The slide plate 19 moves downward with the lifting column 18 and the extrusion ring 17, so that the sealant in the storage cavity 4 can flow into the annular notch 8 through the connecting hole 10, and then flow out through the circular opening 9, so that it can be applied on the polyester backpack;

[0044] Further, the starter motor 13 drives the drive shaft 14 to rotate, and the drive shaft 14 drives the gear 15 to rotate, so that the outer gear ring 16 and the fixed ring 7 rotate, and the extruded sealant can be evenly applied to the edge of the area to be tested of the polyester backpack, so as to ensure the uniform thickness of the application, thereby ensuring the sealing effect and improving the accuracy of the water permeability performance detection;

[0045] Furthermore, by starting the water pump 32 to draw the water source in the water storage tank 31 into the filter box 33, the filter plate 38 in the filter box 33 can filter the water source and filter out the polyester material in the water to prevent it from affecting the subsequent detection effect. Then, the water flows into the detection tube 22 through the hose 34 and is monitored by the liquid level sensor until the water fills the entire detection tube 22. At this time, the water supply is stopped, and the time taken for the water level to drop is monitored by the liquid level sensor, so that the water permeability performance of the polyester backpack can be obtained.

[0046] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A backpack water seepage performance rapid detection device, comprising a detection box (1), characterized in that: The bottom of the inner wall of the detection box (1) is provided with an extrusion mechanism, a smoothing mechanism is provided on the extrusion mechanism, a pressing mechanism is provided on the top of the inner wall of the detection box (1), and a filtering mechanism is provided on the outer wall of the detection box (1); The extrusion mechanism comprises a collecting tube (2) fixedly passing through the bottom of the inner wall of the detection box (1); a placing ring (3) is fixedly connected to the top of the collecting tube (2); a storage cavity (4) for storing sealant is provided inside the placing ring (3); a circular notch (5) is provided at the top of the placing ring (3); an annular groove (6) is provided at the bottom of the circular notch (5); a fixing ring (7) is rotatably connected to the bottom of the annular groove (6); an annular notch (8) is provided on the outer wall of the fixing ring (7); a plurality of circular openings (9) are pierced at the top of the fixing ring (7) and extend into the annular notch (8); the storage cavity (4) and the annular groove (6) are connected via a connecting hole (10); the sealant in the storage cavity (4) enters the annular notch (8) through the connecting hole (10) and is extruded from the circular opening (9); The smoothing mechanism comprises a rotating groove (11) provided on the outer wall of the annular groove (6), one side of the rotating groove (11) is connected to a circular groove (12), the bottom end of the placement ring (3) is fixedly connected to a motor (13), the driving end of the motor (13) is fixedly connected to a driving shaft (14) and extends into the circular groove (12), the other end of the driving shaft (14) is fixedly connected to a gear (15), the outer diameter of the gear (15) is meshingly connected to an outer gear ring (16), the outer gear ring (16) and the fixed ring (7) are fixedly connected, the motor (13) rotates with the fixed ring (7) through the driving shaft (14), the gear (15) and the outer gear ring (16), and the sealant is evenly smoothed.

2. A backpack water seepage rapid detection device according to claim 1, characterized in that: The extrusion mechanism further comprises an extrusion ring (17) arranged at the top of the storage cavity (4), the bottom end of the extrusion ring (17) is symmetrically fixedly connected to a lifting column (18), and the bottom ends of the two lifting columns (18) are both fixedly connected to a slide plate (19).

3. A backpack water seepage performance rapid detection device according to claim 2, characterized in that: The extrusion mechanism also includes slide grooves (20) provided on both sides of the inner wall of the detection box (1), the two slide grooves (20) and the two slide plates (19) are respectively slidably connected, and a first spring (21) is fixedly connected between the two groups of the slide grooves (20) and the slide plates (19).

4. A backpack water seepage rapid detection device according to claim 2, characterized in that: The pressing mechanism comprises a detection tube (22) which slides through the top of the detection box (1), a liquid level sensor is fixedly penetrated through the top of the detection tube (22), a telescopic tube (23) is arranged on the outer wall of the detection tube (22), a support plate (24) is symmetrically fixedly connected to the outer wall of the telescopic tube (23), and the two support plates (24) are both slidably connected to the inner wall of the detection box (1).

5. A backpack water seepage rapid detection device according to claim 4, characterized in that: The bottom ends of the two support plates (24) are fixedly connected with circular columns (25), and the circular columns (25) are arranged above the slide plate (19). The top of the detection box (1) corresponds to the detection tube (22) on both sides of which hydraulic rods (26) are fixedly penetrated, and the telescopic ends of the two hydraulic rods (26) are fixedly connected with the two support plates (24) respectively.

6. A backpack water seepage rapid detection device according to claim 4, characterized in that: The inner wall of the telescopic tube (23) is provided with a telescopic notch (27), the top of the telescopic notch (27) is fixedly connected to a plurality of second springs (28), the bottom ends of the plurality of second springs (28) are fixedly connected to an annular plate (29), the annular plate (29) and the detection tube (22) are fixedly connected, the bottom end of the telescopic tube (23) is fixedly connected to a limiting ring (30), the limiting ring (30) is arranged at the bottom end of the annular plate (29) and leaves a distance between the detection tube (22).

7. The backpack water seepage rapid detection device according to claim 1, characterized in that: The filtering mechanism comprises a water storage tank (31) fixedly connected to the bottom end of the detection box (1) and a water pump (32) fixedly connected to one end of the detection box (1); the water pump (32) and the water storage tank (31) are connected via a pipeline; a filter box (33) is fixedly connected to the top end of the detection box (1); the filter box (33) and the water pump (32) are connected via a pipeline; and the filter box (33) and the detection tube (22) are connected via a hose (34).

8. A backpack water seepage rapid detection device according to claim 7, characterized in that: A cover plate (35) is arranged at the top of the filter box (33), a sealing groove (36) is opened at the top of the filter box (33), a sealing rod (37) whose shape matches the sealing groove (36) is fixedly connected to the bottom of the cover plate (35), and a plurality of filter plates (38) are fixedly connected to the inner side of the sealing rod (37) at the bottom of the cover plate (35).

9. A backpack water seepage rapid detection device according to claim 8, characterized in that: Both ends of the filter box (33) slide through the limit rod (39), and the ends of the two limit rods (39) away from the filter box (33) are fixedly connected to pull blocks (40), and the ends of the two pull blocks (40) close to the filter box (33) are fixedly connected to the lower side of the limit rod (39) corresponding to the end of the limit rod (39), and the two tension springs (41) are fixedly connected to the filter box (33), and both ends of the sealing rod (37) are provided with limit grooves (42) that are compatible with the shape of the limit rod (39).

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