An industrial wastewater treatment system

Abstract

The application discloses an industrial wastewater treatment system and relates to the technical field of wastewater treatment, which comprises a filter tank, a tank body, a water outlet pipe communicated with the bottom of the left inner wall of the tank body, a driving motor fixedly connected to the bottom of the tank body, an output end of the driving motor fixedly connected with a stirring shaft, and a connecting sleeve fixedly connected to the surface of the stirring shaft. The oil absorption mechanism is arranged to push the fixing frame to the water surface through the air cylinder, and then the rotation of the servo motor promotes the rotation of the oil absorption felt, so that the oil stain on the water surface can be adsorbed through the oil absorption felt. Meanwhile, the servo motor converts the control signal into torque and rotating speed to drive and control the object. The adjustment of the rotating speed of the servo motor is mainly realized through the external servo controller. The controller adjusts the control signal of the motor according to the difference between the instruction signal and the feedback signal, changes the rotating speed of the motor, and makes the servo motor work at a low rotating speed.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to an industrial wastewater treatment system. Background Technology

[0002] Wastewater treatment is the process of purifying wastewater to meet the water quality requirements for discharge into a water body or for reuse. Industrial wastewater includes production wastewater and industrial sewage, which refers to wastewater and waste liquid generated during industrial production processes. It contains industrial production materials, intermediate products, by-products, and pollutants generated during production that are lost with the water.

[0003] The treatment of industrial wastewater is particularly important at present. Generally, the treatment process for industrial wastewater simply involves filtering inorganic floating matter, which mainly refers to particulate or flaky substances that float in the wastewater. Most of these substances are non-toxic but can have a certain impact on the environment. Industrial wastewater also contains organic floating matter, which refers to organic matter that floats in the wastewater. Organic floating matter includes fibers, plastic products, branches, wood blocks, paper products, grease, or colloidal substances. If organic floating matter is not filtered completely, it will affect the surrounding environment, and the filtration effect is not ideal. Therefore, we propose an industrial wastewater treatment system. Summary of the Invention

[0004] The purpose of this invention is to provide an industrial wastewater treatment system to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an industrial wastewater treatment system, including a filter tank, the filter tank including a tank body, an outlet pipe connected to the bottom of the left side of the inner wall of the tank body, a drive motor fixedly connected to the bottom of the tank body, a stirring shaft fixedly connected to the output end of the drive motor, a connecting sleeve fixedly connected to the surface of the stirring shaft, and a stirring blade fixedly connected inside the connecting sleeve.

[0006] A filtration mechanism is installed at the top of the inner cavity of the tank. The filtration mechanism includes a lower filter cylinder and an upper filter cylinder. The upper filter cylinder is located inside the lower filter cylinder, and the diameter of the upper filter cylinder is smaller than the diameter of the lower filter cylinder.

[0007] The top of the tank is equipped with an oil suction mechanism, which includes a cover, a push cylinder for adjusting the position, and a fixing frame installed at the bottom of the cover.

[0008] A scraping mechanism is installed on the right side of the fixing frame. The scraping mechanism includes a scraping frame and an oil scraping block for scraping oil.

[0009] Preferably, the lower filter cylinder has lower filter holes around its inner cavity, the upper filter cylinder has upper filter holes around its inner cavity, and the upper filter cylinder has fine filter holes in its inner cavity. The fine filter holes are distributed around the inside of the upper filter cylinder, and the diameter of the fine filter holes is smaller than the diameter of the upper filter holes. The diameters of the lower filter holes and the upper filter holes are the same.

[0010] Preferably, the bottom of the inner cavity of the lower filter cartridge is provided with a groove, the inside of the groove is provided with a positioning groove, a rotating seat is movably connected to the inside of the groove, a rotating column is fixedly connected to the top of the rotating seat, the top of the rotating column is fixedly connected to the bottom of the upper filter cartridge, a support column is fixedly connected to one side of the inner cavity of the rotating seat, and a locking block is movably connected to the center of the surface of the support column, the surface of the locking block is engaged with the inside of the positioning groove.

[0011] Preferably, a return spring is fitted on both the top and bottom of the surface of the support column. One side of the return spring is fixedly connected to the interior of the rotating seat, and the other side of the return spring is fixedly connected to the surface of the locking block.

[0012] Preferably, a slider is fixedly connected to the right side of the surface of the upper filter cartridge, and a push plate is fixedly connected to the right side of the slider, the push plate being arranged in an L-shape.

[0013] Preferably, the bottom of the pushing cylinder is fixedly connected to the top of the cover, a water inlet pipe is connected to the left side of the top of the cover, the output end of the pushing cylinder is fixedly connected to the top of the fixing frame, a servo motor is fixedly connected to the back side of the fixing frame, a rotating shaft is fixedly connected to the output end of the servo motor, the rotating shaft is movably connected to the inside of the fixing frame, and a rotating cylinder is fixedly connected to the surface of the rotating shaft.

[0014] Preferably, the left side of the scraping frame is fixed to the right side of the fixing frame, and a collection box is fixedly connected to the bottom of the scraping frame. The collection box is located at the bottom of the oil scraping block, and one side of the oil scraping block is in close contact with the surface of the oil-absorbing felt.

[0015] Preferably, the scraper has transverse grooves on both the front and back sides of the bottom of the inner cavity. A movable column is movably connected to the inner cavity of the transverse groove. A compression spring is fixedly connected to one side of the movable column. One side of the compression spring is fixedly connected to the inner wall of the transverse groove. A limit plate is fixedly connected to the outer side of the movable column.

[0016] Preferably, a top seat is fixedly connected to the top of the tank, and a circular groove is formed in the inner cavity of the top seat. The diameter of the circular groove is the same as the diameter of the slider, and the interior of the circular groove is movably connected to the surface of the slider.

[0017] Preferably, both the top seat and the cover are equipped with a connecting mechanism. The connecting mechanism includes a connecting frame, one side of which is in close contact with the surface of the cover. A connecting screw is threaded to the bottom of the inner cavity of the connecting frame, and a baffle is movably connected to the top of the connecting screw via a bearing. The top of the baffle is in close contact with the bottom of the top seat.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. This invention, by setting up a filtration mechanism and adjusting the positions of the lower and upper filter cylinders so that the upper and lower filter holes are in the same position, can block and filter larger inorganic floating objects, causing them to remain in the lower filter cylinder. When the fine filter holes are in the same position as the lower filter holes, the upper filter cylinder blocks and filters smaller inorganic floating objects, thereby achieving the function of adjusting the filter hole diameter.

[0020] 2. This invention uses an oil-absorbing mechanism to push a fixed frame onto the water surface by a cylinder. Then, the rotation of a servo motor causes the oil-absorbing felt to rotate, which absorbs oil on the water surface. At the same time, the servo motor receives control signals and converts them into torque and speed to drive and control the object. The speed adjustment is mainly achieved by an external servo controller. The controller adjusts the motor control signal according to the difference between the command signal and the feedback signal, thereby changing the motor speed and making the servo motor work at a low speed.

[0021] 3. The present invention, by setting up a scraping mechanism, can scrape off the oil stains on the surface of the oil-absorbing felt by the oil scraping block adhering to its surface during the rotation of the oil-absorbing felt, and collect and process the scraped oil stains with the setting of the collection box. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a cross-sectional view of the tank structure of the present invention;

[0024] Figure 3 This is a connection diagram of the drive motor structure of the present invention;

[0025] Figure 4 This is an exploded view of the lower and upper filter cartridge structures of the present invention.

[0026] Figure 5 This is a cross-sectional view of the lower filter cartridge structure of the present invention;

[0027] Figure 6 For the present invention Figure 5 A magnified view of part A;

[0028] Figure 7 This is a cross-sectional view of the lower filter cartridge and rotating seat structure of the present invention;

[0029] Figure 8 This is a cross-sectional view of the cover structure of the present invention;

[0030] Figure 9 This is an exploded view of the connection between the fixing frame and the scraping frame structure of the present invention.

[0031] In the diagram: 1. Filter tank; 11. Tank body; 12. Drive motor; 13. Water outlet pipe; 14. Stirring shaft; 15. Stirring blade; 16. Connecting sleeve; 17. Top seat; 18. Circular groove; 2. Oil suction mechanism; 21. Cover; 22. Push cylinder; 23. Water inlet pipe; 24. Fixing frame; 25. Servo motor; 26. Oil absorption felt; 27. Rotary drum; 28. Rotating shaft; 3. Connecting mechanism; 31. Connecting frame; 32. Connecting screw; 33. Baffle plate; 4. Filter Mechanism; 41. Lower filter cylinder; 42. Upper filter cylinder; 43. Lower filter hole; 44. Upper filter hole; 45. Fine filter hole; 46. Slider; 47. Push plate; 48. Rotating column; 49. Groove; 410. Locking block; 411. Return spring; 412. Support column; 413. Rotating seat; 414. Positioning groove; 5. Scraping mechanism; 51. Scraping frame; 52. Horizontal groove; 53. Moving column; 54. Collection box; 55. Oil scraper block; 56. Compression spring; 57. Limiting plate. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1

[0034] Please see Figure 1-9 The present invention provides a technical solution: an industrial wastewater treatment system. The present invention makes corresponding improvements to the technical problems mentioned in the background art. The filter tank 1 includes a tank body 11. The bottom of the left side of the inner wall of the tank body 11 is connected to a water outlet pipe 13. The bottom of the tank body 11 is fixedly connected to a drive motor 12. The output end of the drive motor 12 is fixedly connected to a stirring shaft 14. The surface of the stirring shaft 14 is fixedly connected to a connecting sleeve 16. The inside of the connecting sleeve 16 is fixedly connected to a stirring blade 15.

[0035] A filter mechanism 4 is installed at the top of the inner cavity of the tank body 11. The filter mechanism 4 includes a lower filter cylinder 41 and an upper filter cylinder 42. The upper filter cylinder 42 is located inside the lower filter cylinder 41, and the diameter of the upper filter cylinder 42 is smaller than the diameter of the lower filter cylinder 41.

[0036] See Figure 4 and Figure 5 The lower filter cylinder 41 has lower filter holes 43 around its inner cavity, and the upper filter cylinder 42 has upper filter holes 44 around its inner cavity. The upper filter cylinder 42 has fine filter holes 45 around its inner cavity, and the fine filter holes 45 are distributed in a ring around the inside of the upper filter cylinder 42. The diameter of the fine filter holes 45 is smaller than the diameter of the upper filter holes 44. The lower filter holes 43 and the upper filter holes 44 have the same diameter. By having the upper filter holes 44 and the lower filter holes 43 in the same position, larger inorganic floating objects can be blocked and filtered, causing them to remain in the lower filter cylinder 41. When the fine filter holes 45 and the lower filter holes 43 are in the same position, the upper filter cylinder 42 blocks and filters smaller inorganic floating objects, thus achieving the filtering function.

[0037] See Figure 5 and Figure 6 The bottom of the inner cavity of the lower filter cylinder 41 is provided with a groove 49, and the inside of the groove 49 is provided with a positioning groove 414. A rotating seat 413 is movably connected inside the groove 49. A rotating column 48 is fixedly connected to the top of the rotating seat 413. The top of the rotating column 48 is fixedly connected to the bottom of the upper filter cylinder 42. A support column 412 is fixedly connected to one side of the inner cavity of the rotating seat 413. A locking block 410 is movably connected to the center of the surface of the support column 412. The surface of the locking block 410 is engaged with the inside of the positioning groove 414. The groove 49 allows the rotating seat 413 to rotate smoothly inside the lower filter cylinder 41. The rotating column 48 connects the rotating seat 413 to the upper filter cylinder 42. The support column 412 supports the position of the locking block 410, thereby enabling the locking block 410 to rotate smoothly during operation.

[0038] See Figure 6 The top and bottom of the support column 412 are fitted with return springs 411. One side of the return spring 411 is fixedly connected to the inside of the rotating seat 413, and the other side of the return spring 411 is fixedly connected to the surface of the locking block 410. With the setting of the return spring 411, when the locking block 410 rotates, the return spring 411 will deform. When the locking block 410 enters the positioning groove 414, the return spring 411 provides the rotation force of the locking block 410, so that the locking block 410 can fit into the inside of the positioning groove 414.

[0039] See Figure 4 A slider 46 is fixedly connected to the right side of the surface of the upper filter cylinder 42, and a push plate 47 is fixedly connected to the right side of the slider 46. The push plate 47 is L-shaped. The slider 46 and the push plate 47 facilitate the operator to push the upper filter cylinder 42, thereby enabling the upper filter cylinder 42 to rotate smoothly.

[0040] See Figure 4A top seat 17 is fixedly connected to the top of the tank body 11. A circular groove 18 is provided in the inner cavity of the top seat 17. The diameter of the circular groove 18 is the same as the diameter of the slider 46, and the inside of the circular groove 18 is movably connected to the surface of the slider 46. The top seat 17 supports the position of the lower filter cylinder 41 and the upper filter cylinder 42. At the same time, the circular groove 18 provides a sliding space for the slider 46, so that the slider 46 can slide smoothly.

[0041] The specific implementation of this embodiment is as follows: Pushing the push plate 47 to rotate clockwise causes the slider 46 to rotate inside the circular groove 18. Simultaneously, the slider 46 rotates the upper filter cylinder 42 inside the lower filter cylinder 41. The rotation of the upper filter cylinder 42 causes the rotating column 48 to rotate, which in turn causes the rotating seat 413 to rotate inside the groove 49. Simultaneously, the rotation of the rotating seat 413 causes the locking block 410 to rotate. When the locking block 410 rotates out of the positioning groove 414, it is subjected to force and rotates around the support column 412. The rotation of the locking block 410 causes the return spring 411 to deform. After the upper filter cylinder 42 rotates into the positioning groove 414, the return spring 411 restores its deformation and causes the locking block 410 to engage inside the positioning groove 414, thus positioning the upper filter cylinder 42 after rotation. The rotation of the upper filter cylinder 42 will drive the upper filter hole 44 and the fine filter hole 45 to rotate. When the fine filter hole 45 is above the lower filter hole 43, it can filter and block small-diameter organic floating matter. Then, the drive motor 12 is started to drive the stirring shaft 14 to rotate. The rotation of the stirring shaft 14 drives the connecting sleeve 16 to rotate. The rotation of the connecting sleeve 16 drives the stirring blade 15 to rotate. The rotation of the stirring blade 15 stirs the industrial wastewater, generating centrifugal force to further improve the filtration effect.

[0042] Example 2

[0043] Please see Figure 1-9 The present invention provides a technical solution: an industrial wastewater treatment system. The present invention makes corresponding improvements to the technical problems mentioned in the background art. An oil suction mechanism 2 is installed on the top of the tank 11. The oil suction mechanism 2 includes a cover 21, a push cylinder 22 for adjusting the position, and a fixing frame 24 installed at the bottom of the cover 21.

[0044] A scraping mechanism 5 is installed on the right side of the mounting bracket 24. The scraping mechanism 5 includes a scraping frame 51 and an oil scraping block 55 for scraping oil.

[0045] See Figure 8 and Figure 9The bottom of the push cylinder 22 is fixedly connected to the top of the cover 21. A water inlet pipe 23 is connected to the left side of the top of the cover 21. The output end of the push cylinder 22 is fixedly connected to the top of the fixed frame 24. A servo motor 25 is fixedly connected to the back side of the fixed frame 24. A rotating shaft 28 is fixedly connected to the output end of the servo motor 25. The rotating shaft 28 is movably connected to the inside of the fixed frame 24. A rotating cylinder 27 is fixedly connected to the surface of the rotating shaft 28. The fixed frame 24 is moved by the push cylinder 22. The movement of the fixed frame 24 drives the rotating cylinder 27 and the rotating shaft 28 to move, thereby adjusting the position of the oil suction.

[0046] See Figure 8 and Figure 9 The left side of the scraping frame 51 is fixed to the right side of the fixing frame 24. The bottom of the scraping frame 51 is fixedly connected to the collection box 54, which is located at the bottom of the oil scraping block 55. One side of the oil scraping block 55 is in close contact with the surface of the oil-absorbing felt 26. The oil scraping block 55 can scrape off the oil stains on the surface of the oil-absorbing felt 26. At the same time, the collection box 54 can collect and process the scraped oil stains. The collection box 54 has a chamfered structure to prevent oil stains from overflowing.

[0047] See Figure 9 The scraper 51 has transverse grooves 52 on the front and back sides of the bottom of the inner cavity. A movable column 53 is movably connected to the inner cavity of the transverse groove 52. A compression spring 56 is fixedly connected to one side of the movable column 53. One side of the compression spring 56 is fixedly connected to the inner wall of the transverse groove 52. A limit plate 57 is fixedly connected to the outer side of the movable column 53. The transverse groove 52 guides the movement of the movable column 53, thereby improving the stability of the movable column 53 when it moves. The compression spring 56 then provides a tight pushing force to the movable column 53, so that the oil scraper 55 can fit tightly against the surface of the oil-absorbing felt 26.

[0048] The specific implementation of this embodiment is as follows: the cylinder 22 pushes the fixed frame 24 downward, and the movement of the fixed frame 24 drives the oil-absorbing felt 26 and the rotating drum 27 to move, thereby adjusting the position between the oil-absorbing felt 26 and the sewage surface. Then, the rotation of the servo motor 25 drives the rotating shaft 28 to rotate at a low speed, and the rotation of the rotating shaft 28 drives the rotating drum 27 to rotate, and the rotation of the rotating drum 27 drives the oil-absorbing felt 26 to rotate. The rotation of the oil-absorbing felt 26 absorbs the oil on the surface of the sewage. At this time, the pressure of the compression spring 56 will cause the moving column 53 to slide in the transverse groove 52. The limiting plate 57 blocks and limits the position of the moving column 53. At the same time, the oil scraper 55 closely adheres to the surface of the oil-absorbing felt 26 to scrape off the oil on the surface of the oil-absorbing felt 26. The scraped oil will be guided by the oil scraper 55 to the collection box 54 for collection.

[0049] Example 3

[0050] Please see Figure 1-9 This invention provides a technical solution: an industrial wastewater treatment system. This invention addresses the technical problems mentioned in the background section by making corresponding improvements. A connecting mechanism 3 is installed on the surfaces of both the top seat 17 and the cover 21. The connecting mechanism 3 includes a connecting frame 31. One side of the connecting frame 31 is in close contact with the surface of the cover 21. A connecting screw 32 is threadedly connected to the bottom of the inner cavity of the connecting frame 31. A baffle 33 is movably connected to the top of the connecting screw 32 via a bearing. The top of the baffle 33 is in close contact with the bottom of the top seat 17. Through the connection screw 32 and the baffle 33, the cover 21 and the top seat 17 can be connected and fixed, further preventing the cover 21 from shaking during operation.

[0051] The specific implementation method of this embodiment is as follows: one side of the connecting bracket 31 is attached to the top of the cover 21, and then the connecting screw 32 is rotated. With the connecting screw 32 and the connecting bracket 31 threadedly connected, the baffle 33 is moved upward until the top of the baffle 33 contacts the bottom of the top seat 17, so that the cover 21 is connected to the top of the top seat 17.

[0052] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An industrial wastewater treatment system, comprising a filter tank (1), characterized in that: The filter tank (1) includes a tank body (11), and a water outlet pipe (13) is connected to the bottom of the left side of the inner wall of the tank body (11). A drive motor (12) is fixedly connected to the bottom of the tank body (11), and a stirring shaft (14) is fixedly connected to the output end of the drive motor (12). A connecting sleeve (16) is fixedly connected to the surface of the stirring shaft (14), and a stirring blade (15) is fixedly connected inside the connecting sleeve (16). A filter mechanism (4) is installed at the top of the inner cavity of the tank (11). The filter mechanism (4) includes a lower filter cylinder (41) and an upper filter cylinder (42). The upper filter cylinder (42) is located inside the lower filter cylinder (41), and the diameter of the upper filter cylinder (42) is smaller than the diameter of the lower filter cylinder (41). The top of the tank (11) is equipped with an oil suction mechanism (2), which includes a cover (21), a push cylinder (22) for adjusting the position, and a fixing frame (24) installed at the bottom of the cover (21). A scraping mechanism (5) is installed on the right side of the fixing frame (24). The scraping mechanism (5) includes a scraping frame (51) and an oil scraping block (55) for scraping oil. The bottom of the inner cavity of the lower filter cylinder (41) is provided with a groove (49), and the inside of the groove (49) is provided with a positioning groove (414). A rotating seat (413) is movably connected inside the groove (49). A rotating column (48) is fixedly connected to the top of the rotating seat (413). The top of the rotating column (48) is fixedly connected to the bottom of the upper filter cylinder (42). A support column (412) is fixedly connected to one side of the inner cavity of the rotating seat (413). A locking block (410) is movably connected to the center of the surface of the support column (412). The surface of the locking block (410) is locked to the inside of the positioning groove (414). The top and bottom of the surface of the support column (412) are fitted with return springs (411). One side of the return spring (411) is fixedly connected to the inside of the rotating seat (413), and the other side of the return spring (411) is fixedly connected to the surface of the locking block (410). The lower filter cylinder (41) has lower filter holes (43) around its inner cavity, and the upper filter cylinder (42) has upper filter holes (44) around its inner cavity. The upper filter cylinder (42) has fine filter holes (45) in its inner cavity, and the fine filter holes (45) are distributed around the inside of the upper filter cylinder (42). The diameter of the fine filter holes (45) is smaller than the diameter of the upper filter holes (44), and the diameters of the lower filter holes (43) and the upper filter holes (44) are the same.

2. The industrial wastewater treatment system according to claim 1, characterized in that: A slider (46) is fixedly connected to the right side of the surface of the upper filter cartridge (42), and a push plate (47) is fixedly connected to the right side of the slider (46). The push plate (47) is arranged in an L-shape.

3. The industrial wastewater treatment system according to claim 1, characterized in that: The bottom of the push cylinder (22) is fixedly connected to the top of the cover (21). A water inlet pipe (23) is connected to the left side of the top of the cover (21). The output end of the push cylinder (22) is fixedly connected to the top of the fixed frame (24). A servo motor (25) is fixedly connected to the back side of the fixed frame (24). A rotating shaft (28) is fixedly connected to the output end of the servo motor (25). The rotating shaft (28) is movably connected to the inside of the fixed frame (24). A rotating cylinder (27) is fixedly connected to the surface of the rotating shaft (28).

4. The industrial wastewater treatment system according to claim 1, characterized in that: The left side of the scraper (51) is fixed to the right side of the fixing frame (24), and the bottom of the scraper (51) is fixedly connected to the collection box (54). The collection box (54) is located at the bottom of the oil scraper (55), and one side of the oil scraper (55) is closely attached to the surface of the oil-absorbing felt (26).

5. An industrial wastewater treatment system according to claim 1, characterized in that: The scraper (51) has a horizontal groove (52) on the front and back sides of the bottom of the inner cavity. A movable column (53) is movably connected to the inner cavity of the horizontal groove (52). A compression spring (56) is fixedly connected to one side of the movable column (53). One side of the compression spring (56) is fixedly connected to the inner wall of the horizontal groove (52). A limit plate (57) is fixedly connected to the outer side of the movable column (53).

6. An industrial wastewater treatment system according to claim 1, characterized in that: The top of the tank (11) is fixedly connected to a top seat (17). The inner cavity of the top seat (17) is provided with a circular groove (18). The diameter of the circular groove (18) is the same as the diameter of the slider (46), and the interior of the circular groove (18) is movably connected to the surface of the slider (46).

7. An industrial wastewater treatment system according to claim 6, characterized in that: The top seat (17) and the cover (21) are both equipped with a connecting mechanism (3). The connecting mechanism (3) includes a connecting frame (31). One side of the connecting frame (31) is in close contact with the surface of the cover (21). The bottom of the inner cavity of the connecting frame (31) is threaded with a connecting screw (32). The top of the connecting screw (32) is movably connected with a baffle (33) through a bearing. The top of the baffle (33) is in close contact with the bottom of the top seat (17).

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