A filter cartridge extraction mechanism

Abstract

The utility model relates to tool technical field especially relates to a filter core takes out mechanism, it includes the material pushing cylinder, expansion assembly and drive assembly, expansion assembly includes a plurality of expansion plates, a plurality of first elastic parts, a plurality of pivot and the support cylinder with first through -hole, the one end of support cylinder is equipped with the multiple first recesses of circumferential interval distribution, the outside of expansion plate is equipped with the step part, the inside of expansion plate is equipped with expansion inclined plane, the top of expansion plate is equipped with the plug -in male part, and the plug -in male part rotates and is installed in the first recess through pivot, first elastic part connects expansion plate and support cylinder, is used for driving all expansion plates to gather in support cylinder, drive assembly includes drive rod and the taper cylinder of connecting drive rod, drive rod sliding installation is in first through -hole, the material pushing cylinder sliding installation is in support cylinder, and the bottom of material pushing cylinder is equipped with the material pushing plate, and the taper cylinder is used for driving a plurality of expansion plates to expand outwardly in the utility model, filter core takes out mechanism convenient to use, and the stability is high.

Description

Technical Field

[0001] This utility model relates to the field of tool technology, and in particular to a filter cartridge removal mechanism. Background Technology

[0002] In nuclear power plants, a cartridge filter is installed in the main pump to ensure the cleanliness of the water injected into the main pump. Over time, the filter accumulates a large amount of impurities, affecting its filtration capacity and requiring regular cleaning. Because the filter is used in the main pump of the nuclear power plant and filters the media in the primary loop, it accumulates a large amount of radioactive media. Therefore, the filter cannot be manually removed from the primary loop; instead, auxiliary tools are needed to remove it, thus avoiding direct contact between personnel and the filter.

[0003] In the existing technology, workers usually use hooks to pick up filters in the primary loop of nuclear power plants. However, hooks are prone to damaging filters when picking them up. Furthermore, hooks can only pick up filters from the bottom, which can cause the filters to shake. Therefore, existing hooks still have the technical problem of being inconvenient to operate. Utility Model Content

[0004] This utility model provides a filter cartridge removal mechanism to solve the technical problems such as inconvenience in operation during the process of hooking the filter in the prior art.

[0005] An embodiment of the present invention provides a filter cartridge removal mechanism, including a top material cylinder, an expansion assembly, and a drive assembly; The expansion assembly includes multiple expansion plates, multiple first elastic elements, multiple rotating shafts, and a support cylinder with a first through hole. One end of the support cylinder has multiple circumferentially spaced first grooves. The outer side of the expansion plate has a stepped portion, the inner side of the expansion plate has an expansion ramp, and the top of the expansion plate has a plug-in protrusion. The plug-in protrusion is rotatably mounted in the first groove via the rotating shaft. The distance between the expansion ramp and the center line of the first through hole gradually increases from top to bottom. The first elastic element connects the expansion plate and the support cylinder and is used to drive all the expansion plates to retract onto the support cylinder. The drive assembly includes a drive rod and a tapered cylinder connected to the drive rod, the outer diameter of the tapered cylinder gradually increasing from top to bottom; the drive rod is slidably installed in the first through hole; The top material cylinder is slidably mounted on the support cylinder, and the bottom surface of the top material cylinder is provided with a top material plate; The conical cylinder is used to drive the multiple expansion plates to expand outward, so that the stepped portion supports the bottom of the filter element to be removed; the top plate is used to press down the top of the filter element to be removed.

[0006] Optionally, the top of the top material cylinder is provided with a plurality of second grooves distributed circumferentially, and each second groove is provided with an elastic limiting buckle; The outer wall of the support cylinder is provided with a plurality of axially spaced limiting side grooves; the elastic limiting buckle is engaged in the limiting side grooves.

[0007] Optionally, the elastic limiting buckle includes an elastic arm and a snap-fit ​​portion disposed on the elastic arm, with one end of the elastic arm away from the snap-fit ​​portion connected to the inner wall of the second groove; along the axial direction of the support cylinder, a first inclined surface and a second inclined surface are respectively provided on opposite sides of the snap-fit ​​portion, and a first annular inclined surface and a second annular inclined surface are respectively provided on opposite sides of the limiting side groove; When the top material cylinder slides upward along the support cylinder, the first inclined surface and the first annular inclined surface abut against each other to drive the elastic limit buckle to undergo elastic deformation outward. When the top material cylinder slides downward along the support cylinder, the second inclined surface and the second annular inclined surface abut against each other to drive the elastic limit buckle to undergo elastic deformation outward.

[0008] Optionally, the support cylinder includes a first cylinder and a second cylinder that are slidably connected, the first groove is disposed at the end of the second cylinder away from the first cylinder, and the limiting side groove is disposed on the outer wall of the first cylinder.

[0009] Optionally, the first through hole includes a first inner hole provided on the first cylinder and a second inner hole provided on the second cylinder; the inner wall of the second inner hole is provided with a first internal thread, and the outer wall of the first cylinder is provided with a first external thread; The bottom of the first cylinder is slidably inserted into the second inner hole via the first external thread and the first internal thread, which are connected by a thread.

[0010] Optionally, the drive rod includes a first rod and a second rod that are slidably connected, with the end of the second rod away from the first rod connected to the tapered cylinder.

[0011] Optionally, the first rod body is provided with a third inner hole, and the inner wall of the third inner hole is provided with a second internal thread; the second rod body is provided with a fourth inner hole, and the outer wall of the second rod body is provided with a second external thread; The end of the second rod away from the tapered cylinder is slidably inserted into the third inner hole of the book search via a threaded connection between the second internal thread and the second external thread.

[0012] Optionally, the second rod and the conical cylinder are integrally formed parts.

[0013] Optionally, the first elastic element is a torsion spring, the expansion plate is provided with a first limiting hole, and the support cylinder is provided with a plurality of second limiting holes; The torsion spring is sleeved on the rotating shaft, the first arm of the torsion spring is inserted into the first limiting hole, and the second arm of the torsion spring is inserted into the second limiting hole.

[0014] Optionally, the top plate is provided with a limiting groove.

[0015] In this invention, when the conical cylinder is not pressing the expansion plates, the elastic force of the first elastic element causes all the expansion plates to be in a retracted state. The filter element removal mechanism can extend into the inner hole of the filter element to be removed, and neither the expansion plates nor the top material cylinder will interfere with the filter element to be removed. After the stepped portion of the expansion plate is located below the filter element to be removed, the drive rod moves upward, and the drive rod drives the conical cylinder to move upward. The conical cylinder will cause all the expansion plates to expand outward, and then the filter element removal mechanism moves upward. The stepped portion of the conical cylinder will abut against the bottom of the filter element to be removed. Then the top material cylinder slides downward, and the top material plate at the bottom of the top material cylinder will press down on the top of the filter element to be removed, thereby limiting the filter element to be removed between the top material plate and the stepped portion. The operator can then remove the filter element to be removed through the filter element removal mechanism.

[0016] In this invention, during the process of removing the filter element using the filter element removal mechanism, the stepped portion of the conical cylinder supports the bottom of the filter element upwards, and multiple expansion plates can support the bottom of the filter element from all sides. The top plate of the top material cylinder presses the filter element downwards, ensuring the stability of the filter element removal mechanism when removing the filter element. Furthermore, the filter element removal mechanism will not cause accidents such as scratching or damaging the filter element. In addition, the filter element removal mechanism is convenient to use, has a simple structure, and low manufacturing cost. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the filter cartridge removal mechanism provided in one embodiment of the present invention; Figure 2 This is a cross-sectional view of a filter cartridge removal mechanism provided in an embodiment of the present invention; Figure 3 This is an exploded view of the filter cartridge removal mechanism provided in one embodiment of the present invention; Figure 4 This is a schematic diagram of the expansion assembly of the filter cartridge removal mechanism provided in an embodiment of the present invention; Figure 5 yes Figure 4 A magnified view of a section at point A in the middle; Figure 6 yes Figure 4 A magnified view of a section at point B in the middle; Figure 7 This is a schematic diagram of the top material cylinder of the filter element removal mechanism provided in one embodiment of the present invention; Figure 8 yes Figure 7 A magnified view of a section at point C; Figure 9 This is a schematic diagram of the expansion plate of the filter cartridge removal mechanism provided in one embodiment of the present invention.

[0019] The reference numerals in the accompanying drawings are as follows: 1. Top material cylinder; 11. Top material plate; 111. Limiting groove; 12. Second groove; 13. Elastic limiting buckle; 131. Elastic arm; 132. Buckle part; 133. First inclined surface; 134. Second inclined surface; 2. Expansion assembly; 21. Expansion plate; 211. Step part; 212. Expansion inclined surface; 213. Insertion protrusion; 22. First elastic element; 23. Rotating shaft; 24. Support cylinder; 241. First through hole; 242. First groove; 243. Limiting side groove; 244. First annular inclined surface; 245. Second annular inclined surface; 246. First cylinder body; 247. Second cylinder body; 3. Drive assembly; 31. Drive rod; 311. First rod body; 312. Second rod body; 32. Conical cylinder. Detailed Implementation

[0020] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] like Figures 1 to 5 As shown, an embodiment of the present invention provides a filter cartridge removal mechanism, including a top material cylinder 1, an expansion assembly 2, and a drive assembly 3; The expansion assembly 2 includes multiple expansion plates 21, multiple first elastic elements 22, multiple rotating shafts 23, and a support cylinder 24 with a first through hole 241. One end of the support cylinder 24 has multiple circumferentially spaced first grooves 242. The outer surface of the expansion plate 21 has a stepped portion 211, and the inner surface of the expansion plate 21 has an expansion inclined surface 212. The top of the expansion plate 21 has an insertion protrusion 213, which is rotatably mounted in the first groove 242 via the rotating shaft 23. The distance between the expansion inclined surface 212 and the center line of the first through hole 241 gradually increases from top to bottom. The first elastic element 22 connects the expansion plate 21 and the support cylinder 24, and is used to drive all the expansion plates 21 to retract onto the support cylinder 24. The drive assembly 3 includes a drive rod 31 and a tapered cylinder 32 connected to the drive rod 31. The outer diameter of the tapered cylinder 32 gradually increases from top to bottom. The drive rod 31 is slidably installed in the first through hole 241. The top material cylinder 1 is slidably mounted on the support cylinder 24, and the bottom surface of the top material cylinder 1 is provided with a top material plate 11; The conical cylinder 32 is used to drive the multiple expansion plates 21 to expand outward, so that the stepped portion 211 supports the bottom of the filter element to be taken; the top plate 11 is used to press down the top of the filter element to be taken.

[0022] The first elastic element 22 includes, but is not limited to, springs, torsion springs, etc.; the number of expansion plates 21 can be set according to actual needs, the number of expansion plates 21 is equal to the number of the first grooves 242, and the number of the first elastic element 22 is twice the number of expansion plates 21; all the expansion plates 21 are arranged in a conical structure.

[0023] The insertion protrusion 213 is rotatably mounted in the first groove 242 through one or two rotating shafts 23 in a one-to-one correspondence, and each of the rotating shafts 23 is fitted with a first elastic element 22.

[0024] Specifically, when the conical cylinder 32 is not pressing the expansion plates 21, the elastic force of the first elastic member 22 causes all the expansion plates 21 to be in a retracted state. The filter element removal mechanism can extend into the inner hole of the filter element to be removed, and neither the expansion plates 21 nor the top material cylinder 1 will interfere with the filter element to be removed. After the stepped portion 211 of the expansion plate 21 is below the filter element to be removed, the drive rod 31 moves upward. The drive rod 31 drives the conical cylinder 32 to move upward. The conical cylinder 32 will drive all the expansion plates 21 to expand outward. Then, the filter element removal mechanism moves upward, and the stepped portion 211 of the conical cylinder 32 will abut against the bottom of the filter element to be removed. Then, the top material cylinder 1 slides downward, and the top material plate 11 at the bottom of the top material cylinder 1 will press down on the top of the filter element to be removed. Thus, the filter element to be removed will be limited between the top material plate 11 and the stepped portion 211, and the operator can then remove the filter element to be removed through the filter element removal mechanism.

[0025] In this invention, during the process of removing the filter element using the filter element removal mechanism, the stepped portion 211 of the conical cylinder 32 supports the bottom of the filter element upwards, and multiple expansion plates 21 can support the bottom of the filter element from all sides. The top plate 11 of the top material cylinder 1 presses the filter element downwards, ensuring the stability of the filter element removal mechanism when removing the filter element. Furthermore, the filter element removal mechanism will not cause accidents such as scratching or damaging the filter element. In addition, the filter element removal mechanism is convenient to use, has a simple structure, and low manufacturing cost.

[0026] In one embodiment, such as Figure 1 , Figure 4 as well as Figures 6 to 8 As shown, the top of the top material cylinder 1 is provided with a plurality of second grooves 12 distributed circumferentially, and each second groove 12 is provided with an elastic limiting buckle 13. The outer wall of the support cylinder 24 is provided with a plurality of axially spaced limiting side grooves 243; the elastic limiting buckle 13 is engaged in the limiting side grooves 243.

[0027] The number of the second groove 12 can be set according to actual needs. For example, the second groove 12 can be provided with 3, 4, 6, etc. The number of the limiting side groove 243 can be set according to actual needs. The limiting side groove 243 can limit the vertical sliding stroke of the top material cylinder 1.

[0028] Specifically, during the process of the top material cylinder 1 moving up and down along the support cylinder 24, the outer wall of the support cylinder 24 will press the elastic limiting buckle 13 outward. When the top material cylinder 1 moves into place, the elastic limiting buckle 13 is engaged in the limiting groove 111, thereby ensuring the stability of the top material cylinder 1 being limited on the support cylinder 24. When it is necessary to slide the top material cylinder 1 up and down, a larger thrust is required.

[0029] In this embodiment, the top material cylinder 1 is easy to move up and down along the support cylinder 24.

[0030] In one embodiment, as shown in the figure Figure 4 as well as Figures 6 to 8 As shown, the elastic limiting buckle 13 includes an elastic arm 131 and a latching part 132 disposed on the elastic arm 131. One end of the elastic arm 131 away from the latching part 132 is connected to the inner wall of the second groove 12. Along the axial direction of the support cylinder 24, the latching part 132 has a first inclined surface 133 and a second inclined surface 134 respectively on opposite sides. The limiting side groove 243 has a first annular inclined surface 244 and a second annular inclined surface 245 respectively on opposite sides. When the top material cylinder 1 slides upward along the support cylinder 24, the first inclined surface 133 and the first annular inclined surface 244 abut against each other to drive the elastic limit buckle 13 to undergo elastic deformation outward. When the top material cylinder 1 slides downward along the support cylinder 24, the second inclined surface 134 and the second annular inclined surface 245 abut against each other to drive the elastic limit buckle 13 to undergo elastic deformation outward.

[0031] The buckle 132 and the elastic arm 131 are integrally formed; the first inclined surface 133 and the first annular inclined surface 244 are adapted to each other, and the second inclined surface 134 and the second annular inclined surface 245 are adapted to each other; the distance between the first inclined surface 133 and the axis of the top material cylinder 1 gradually decreases from top to bottom, and the distance between the second inclined surface 134 and the axis of the top material cylinder 1 gradually increases from top to bottom; the distance between the first annular inclined surface 244 and the axis of the first cylinder 246 gradually decreases from top to bottom, and the distance between the second annular inclined surface 245 and the axis of the second cylinder 247 gradually increases from top to bottom.

[0032] Specifically, during the upward movement of the top material cylinder 1, the first inclined surface 133 moves along the first annular inclined surface 244, thereby the first annular inclined surface 244 gradually presses the elastic limiting buckle 13 outward through the first inclined surface 133, and thus the buckling part 132 can move upward past the limiting side groove 243. During the downward movement of the top material cylinder 1, the second inclined surface 134 moves along the second annular inclined surface 245, thereby the second annular inclined surface 245 gradually presses the elastic limiting buckle 13 outward through the second inclined surface 134, and thus the buckling part 132 can move downward past the limiting side groove 243.

[0033] In this embodiment, the top material cylinder 1 is easy to move up and down along the support cylinder 24.

[0034] In one embodiment, such as Figure 4 As shown, the support cylinder 24 includes a first cylinder 246 and a second cylinder 247 that are slidably connected. The first groove 242 is disposed at one end of the second cylinder 247 away from the first cylinder 246, and the limiting side groove 243 is disposed on the outer wall of the first cylinder 246.

[0035] The first cylinder 246 and the second cylinder 247 can be slidably connected by a threaded structure, a snap-fit ​​structure, or the like.

[0036] In this embodiment, the first cylinder 246 and the second cylinder 247 are slidably connected, and the length of the support cylinder 24 can be adjusted, so that the filter cartridge removal mechanism can be applied to filter cartridges to be removed at different depths.

[0037] In one embodiment, such as Figure 2 and Figure 4 As shown, the first through hole 241 includes a first inner hole provided on the first cylinder 246 and a second inner hole provided on the second cylinder 247; the inner wall of the second inner hole is provided with a first internal thread, and the outer wall of the first cylinder 246 is provided with a first external thread. The bottom of the first cylinder 246 is slidably inserted into the second inner hole via the first external thread and the first internal thread connected by threads.

[0038] The height of the first internal thread is less than the height of the first external thread.

[0039] In this embodiment, the first cylinder 246 and the second cylinder 247 are connected by a threaded structure, which makes the length adjustment of the support cylinder 24 convenient, and the support cylinder 24 has a simple structure and low manufacturing cost.

[0040] In one embodiment, such as Figure 2 and Figure 3 As shown, the drive rod 31 includes a first rod body 311 and a second rod body 312 that are slidably connected, and the end of the second rod body 312 away from the first rod body 311 is connected to the conical cylinder 32.

[0041] The first rod 311 and the second rod 312 can be slidably connected by a snap-fit ​​structure, a snap-fit ​​mechanism, or the like.

[0042] In this embodiment, the first rod 311 and the second rod 312 are slidably connected, thereby adjusting the length of the drive rod 31 so that the filter cartridge removal mechanism can be applied to filter cartridges at different depths.

[0043] In one embodiment, such as Figure 2 and Figure 3 As shown, the first rod body 311 is provided with a third inner hole, and the inner wall of the third inner hole is provided with a second internal thread; the second rod body 312 is provided with a fourth inner hole, and the outer wall of the second rod body 312 is provided with a second external thread; The end of the second rod 312 away from the tapered cylinder 32 is slidably inserted into the third inner hole of the book search via the second internal thread and the second external thread.

[0044] In this embodiment, the first rod 311 and the second rod 312 are connected by a threaded structure, which makes the length adjustment of the drive rod 31 convenient, and the drive rod 31 has a simple structure and low manufacturing cost.

[0045] In one embodiment, such as Figure 3 As shown, the second rod 312 and the conical cylinder 32 are integrally formed parts.

[0046] In one embodiment, such as Figure 4 and Figure 5 As shown, the first elastic element 22 is a torsion spring, the expansion plate 21 is provided with a first limiting hole, and the support cylinder 24 is provided with a plurality of second limiting holes; The torsion spring is sleeved on the rotating shaft 23, the first arm of the torsion spring is inserted into the first limiting hole, and the second arm of the torsion spring is inserted into the second limiting hole.

[0047] The expansion plate 21 is provided with a first shaft hole, the inner sidewall of the first groove 242 is provided with a second shaft hole, and the rotating shaft 23 is rotatably installed in the first shaft hole and the second shaft hole.

[0048] In this embodiment, the elastic force of the torsion spring causes all the expansion plates 21 to retract onto the support cylinder 24. During the process of the conical cylinder 32 driving the expansion plates 21 to rotate outward, the torsion spring will undergo elastic deformation. Thus, when the conical cylinder 32 releases the restriction on the expansion plates 21, the torsion spring will automatically drive the expansion plates 21 to rotate to the retracted state.

[0049] In this embodiment, the filter cartridge removal mechanism has a simple structure and low manufacturing cost.

[0050] In one embodiment, such as Figure 2 As shown, the top plate 11 is provided with a limiting groove 111.

[0051] In this embodiment, the top plate 11 presses down on the top of the filter element to be taken through the limiting groove 111. The limiting groove 111 can control the top of the filter element to be taken, preventing the top of the filter element to be taken from deviating from the top plate 11, and further ensuring the stability of the filter element taking out the filter element.

[0052] The above-described 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 the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A filter cartridge removal mechanism, characterized in that, Includes top cylinder, expansion assembly, and drive assembly; The expansion assembly includes multiple expansion plates, multiple first elastic elements, multiple rotating shafts, and a support cylinder with a first through hole. One end of the support cylinder has multiple circumferentially spaced first grooves. The outer side of the expansion plate has a stepped portion, the inner side of the expansion plate has an expansion ramp, and the top of the expansion plate has a plug-in protrusion. The plug-in protrusion is rotatably mounted in the first groove via the rotating shaft. The distance between the expansion ramp and the center line of the first through hole gradually increases from top to bottom. The first elastic element connects the expansion plate and the support cylinder and is used to drive all the expansion plates to retract onto the support cylinder. The drive assembly includes a drive rod and a tapered cylinder connected to the drive rod, the outer diameter of the tapered cylinder gradually increasing from top to bottom; the drive rod is slidably installed in the first through hole; The top material cylinder is slidably mounted on the support cylinder, and the bottom surface of the top material cylinder is provided with a top material plate; The conical cylinder is used to drive the multiple expansion plates to expand outward, so that the stepped portion supports the bottom of the filter element to be taken; the top plate is used to press down the top of the filter element to be taken.

2. The filter cartridge removal mechanism according to claim 1, characterized in that, The top of the top material cylinder is provided with a plurality of second grooves distributed circumferentially, and each second groove is provided with an elastic limiting buckle. The outer wall of the support cylinder is provided with a plurality of axially spaced limiting side grooves; the elastic limiting buckle is engaged in the limiting side grooves.

3. The filter cartridge removal mechanism according to claim 2, characterized in that, The elastic limiting buckle includes an elastic arm and a snap-fit ​​part disposed on the elastic arm. The end of the elastic arm away from the snap-fit ​​part is connected to the inner wall of the second groove. Along the axial direction of the support cylinder, a first inclined surface and a second inclined surface are respectively provided on opposite sides of the snap-fit ​​part, and a first annular inclined surface and a second annular inclined surface are respectively provided on opposite sides of the limiting side groove. When the top material cylinder slides upward along the support cylinder, the first inclined surface and the first annular inclined surface abut against each other to drive the elastic limit buckle to undergo elastic deformation outward. When the top material cylinder slides downward along the support cylinder, the second inclined surface and the second annular inclined surface abut against each other to drive the elastic limit buckle to undergo elastic deformation outward.

4. The filter cartridge removal mechanism according to claim 2, characterized in that, The support cylinder includes a first cylinder and a second cylinder that are slidably connected. The first groove is disposed at the end of the second cylinder away from the first cylinder, and the limiting side groove is disposed on the outer wall of the first cylinder.

5. The filter cartridge removal mechanism according to claim 4, characterized in that, The first through hole includes a first inner hole provided on the first cylinder and a second inner hole provided on the second cylinder; the inner wall of the second inner hole is provided with a first internal thread, and the outer wall of the first cylinder is provided with a first external thread; The bottom of the first cylinder is slidably inserted into the second inner hole via the first external thread and the first internal thread, which are connected by a thread.

6. The filter cartridge removal mechanism according to claim 1, characterized in that, The drive rod includes a first rod and a second rod that are slidably connected, with the end of the second rod away from the first rod connected to the tapered cylinder.

7. The filter cartridge removal mechanism according to claim 6, characterized in that, The first rod body is provided with a third inner hole, and the inner wall of the third inner hole is provided with a second internal thread; the second rod body is provided with a fourth inner hole, and the outer wall of the second rod body is provided with a second external thread; The end of the second rod away from the tapered cylinder is slidably inserted into the third inner hole of the book search via a threaded connection between the second internal thread and the second external thread.

8. The filter cartridge removal mechanism according to claim 6, characterized in that, The second rod and the conical cylinder are integrally formed parts.

9. The filter cartridge removal mechanism according to claim 1, characterized in that, The first elastic element is a torsion spring, the expansion plate is provided with a first limiting hole, and the support cylinder is provided with a plurality of second limiting holes; The torsion spring is sleeved on the rotating shaft, the first arm of the torsion spring is inserted into the first limiting hole, and the second arm of the torsion spring is inserted into the second limiting hole.

10. The filter cartridge removal mechanism according to claim 1, characterized in that, The top plate is provided with a limiting groove.

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