Submerged plant culture and root exudate circulating collection device

Abstract

The invention discloses a submerged plant culture and root exudates circulating collection device, and relates to the technical field of exudates collection, the submerged plant culture and root exudates circulating collection device comprises a culture box, the bottom of the culture box is fixedly connected with a plurality of connecting rods, the ends, away from the culture box, of the connecting rods are fixedly connected with a collection box, and the side, away from the connecting rods, of the culture box is movably connected with a top cover; a lamp is fixedly connected to the side, close to the incubator, of the top cover, a plurality of culture fixing pipes are movably connected to the interior of the incubator, a secretion collecting assembly is arranged on the incubator, and the secretion collecting assembly comprises a threaded rod and an extrusion rod which are rotationally connected to the interior of the incubator, and a spring and an inclined block which are symmetrically and movably connected to the interior of the incubator; the threaded rod rotates to drive the extrusion rod to rotate, the extrusion rod rotates around the special inclined block in a sliding mode, root exudates can be more effectively released into a culture solution through the exudates collecting assembly, and therefore the exudates collecting efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of secretion collection, and in particular to a submerged plant culture and root secretion circulation collection device. Background Art

[0002] Plant root exudates are important media for the interaction between plants and the soil environment. Their collection is of great significance for the study of plant physiological ecology, soil microbial activities and sustainable agricultural development. The root exudates of submerged plants refer to a variety of substances secreted or released into the growth medium by different parts of the root system during their growth. These substances are of various types, including low relative molecular mass organic substances, high molecular weight adhesive substances, root cell shedding and their decomposition products, etc. They are crucial to the vitality of the rhizosphere micro-ecosystem, can affect the diversity, metabolic activity and abundance of rhizosphere microorganisms, and play an important role in soil nutrient activation and plant nutrient absorption.

[0003] After searching, the invention patent with Chinese patent number CN112539969B discloses a continuous collection device for plant root secretions. Compared with the prior art, the invention patent with Chinese patent number CN112539969B has a culture solution drainage chamber and a culture solution inlet chamber on both sides, and a plant cultivation trough for planting plants on the top. A number of secretion collecting columns are distributed in the root culture soil of the root culture box, and the two ends of the secretion collecting columns respectively pass through the side walls of the root culture box and extend into the culture solution drainage chamber and the culture solution inlet chamber, thereby connecting the culture solution drainage chamber and the culture solution inlet chamber. The present invention can make the roots penetrate into the secretion collection column, and then drive the culture solution to flow in the secretion collection column through two peristaltic pumps. During this process, the root secretions will be dissolved and carried away by the culture solution, and then adsorbed by the adsorption resin in the secretion adsorption structure, thereby completing the continuous collection of the root secretions. It does not affect the growth of the plant roots, and there is no need to dig out the plant roots, thus avoiding damage to the roots. The collection method is relatively simple and convenient.

[0004] However, in actual use, the above-mentioned device collects secretions through the flow of culture solution. The collection process is relatively simple, and it is difficult to fully and effectively dissolve and carry away the root secretions, resulting in low collection efficiency. At the same time, the device lacks an effective mechanism to clean up the detached roots. These rotten roots are easy to accumulate and contaminate the secretions and culture solution, which not only affects the collection purity, but may also interfere with plant health and subsequent analysis. Therefore, a submerged plant culture and root secretion circulation collection device is proposed. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art that secretions are collected through the flow of culture solution, the collection process is relatively simple, resulting in low collection efficiency, and the device lacks an effective mechanism to clean up the detached roots. These rotten roots are prone to accumulate and contaminate the secretions and culture solution. A submerged plant culture and root secretion circulation collection device is proposed.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A submerged plant culture and root secretion circulation collection device, comprising a culture box, a plurality of connecting rods are fixedly connected to the bottom of the culture box, a collection box is fixedly connected to one end of the connecting rod away from the culture box, a top cover is movably connected to the side of the culture box away from the connecting rod, a lamp is fixedly connected to the side of the top cover close to the culture box, a plurality of culture fixed tubes are movably connected inside the culture box, a secretion collection component is arranged on the culture box, and the secretion collection component comprises a threaded rod and an extrusion rod rotatably connected inside the culture box, and a symmetrically movably connected inside the culture box. Spring and inclined block, the rotation of the threaded rod drives the extrusion rod to rotate, the rotation of the extrusion rod slides and rotates around the special inclined block, the extrusion of the spring makes the inclined block always contact with the extrusion rod, so that the culture fixed tube is gently shaken left and right through the rotation of the extrusion rod, so that the roots of the submerged plants planted in the culture fixed tube and the culture solution inside the incubator produce resistance friction, the interior of the incubator is slidably connected with a scraper, and the outside of the incubator is movably connected with a resin column, the forward and reverse rotation of the threaded rod drives the scraper to slide left and right, and the roots and branches and leaves dropped by the submerged plants in the incubator are scraped off and collected on the resin column.

[0008] The above technical solution further includes:

[0009] A motor is fixedly connected to the outside of the incubator, an output shaft end of the motor is fixedly connected to a threaded rod, the scraper is threadedly connected to the threaded rod, a limiting rod is symmetrically fixedly connected to the inside of the incubator, the scraper is slidably connected to the limiting rod, the starting of the motor drives the threaded rod to rotate, and the rotating threaded rod causes the scraper to slide on the limiting rod.

[0010] The interior of the incubator is symmetrically fixedly connected with a slide rail, the interior of the slide rail is slidably connected with a support frame, the support frame is movably connected with a culture plate on one side close to the top cover, the culture fixed tube is fixedly connected to the culture plate, and the slide rail restricts the support frame so that the support frame slides in the slide rail.

[0011] The support frame is threadedly connected to the nut, the number of the nuts is multiple and symmetrically distributed, the nut is movably connected to the culture plate, the support frame is fixedly connected to the spring, and the spring is fixedly connected to the slide rail. The spring is squeezed during the left and right sliding process of the support frame, and the rebound of the spring causes the support frame to return to the origin.

[0012] The support frame is fixedly connected to the inclined block, a rotating rod is rotatably connected to the outer side of the incubator, a belt is sleeved between the threaded rod and the rotating rod, and the rotation of the threaded rod drives the rotating rod to rotate through the belt.

[0013] The end of the rotating rod close to the inclined block is fixedly connected with a rotating disk, the side of the rotating disk close to the inclined block is fixedly connected to the extrusion rod, the side of the extrusion rod close to the inclined block is movably connected with a ball, the ball is movably connected to the inclined block, and the rotation of the rotating rod drives the extrusion rod and the ball to slide on the side of the inclined block and squeeze the inclined block.

[0014] The outside of the incubator is fixedly connected with a water pump, the outside of the water pump is fixedly connected with a water pipe, the water pipe is fixedly connected to the incubator and the collection box, and the water pump is started to absorb the culture fluid inside the collection box through the water pipe and transfer it to the incubator.

[0015] An air pump is fixedly connected to the outside of the incubator, an air supply pipe is fixedly connected to the outside of the air pump, an air outlet pipe is symmetrically fixedly connected to the inside of the incubator, the two air outlet pipes are fixedly connected to the air supply pipe, and the air pump is started to supply oxygen to the submerged plants through the air outlet pipe.

[0016] The interior of the incubator is symmetrically provided with a collecting tank, and a first connecting pipe is symmetrically fixedly connected to one side of the incubator close to the top cover. The outer sides of the two first connecting pipes are rotatably connected to valves. The first connecting pipes are connected to the collecting tank, and the impurities scraped off by the scraper are deposited on the resin column through the collecting tank.

[0017] A third connecting tube is symmetrically fixedly connected to one side of the collecting box close to the incubator, a second connecting tube is movably connected between the first connecting tube and the third connecting tube, the second connecting tube is movably connected to the resin column, the first connecting tube, the third connecting tube and the second connecting tube are all threadedly connected to the threaded sleeve, and the rotation of the threaded sleeve can connect and disconnect the second connecting tube, the third connecting tube and the first connecting tube.

[0018] The present invention has the following beneficial effects:

[0019] 1. In the present invention, by shaking the culture fixed tube in the secretion collection component left and right, the roots of the submerged plants planted in the culture fixed tube generate resistance friction with the culture solution inside the culture box, which can enhance the comprehensive contact and exchange efficiency between the roots and the culture solution, help the root secretions to be more effectively released into the culture solution, thereby improving the secretion collection efficiency.

[0020] 2. In the present invention, the scraper is driven to slide left and right by the forward and reverse rotation of the threaded rod, and the roots and branches and leaves dropped from the submerged plants in the incubator are scraped off and collected on the resin column. The collected roots and branches and leaves can be cleaned by the experimenter in the process of taking out the resin column to prevent the roots from accumulating and rotting and contaminating the secretions and culture solution, affecting the purity of the collected secretions, and avoiding interference with plant health and subsequent analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of a device for cultivating submerged plants and circulating and collecting root secretions proposed by the present invention;

[0022] Figure 2 It is a schematic diagram of the overall side structure of the present invention;

[0023] Figure 3 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the secretion collecting component in the present invention;

[0025] Figure 5 This is a schematic diagram of the side structure of the secretion collecting component in the present invention;

[0026] Figure 6 It is a schematic diagram of the cross-sectional structure of the whole part in the present invention;

[0027] Figure 7 for Figure 5 A schematic diagram of the enlarged structure in the middle.

[0028] In the figure: 1. incubator; 2. top cover; 3. water pump; 4. water pipe; 5. air pump; 6. air pipe; 7. connecting rod; 8. collecting box; 9. valve; 10. first connecting pipe; 11. threaded sleeve; 12. second connecting pipe; 13. third connecting pipe; 14. lamp; 15. air outlet pipe; 16. collecting tank; 17. resin column; 18. motor; 19. belt; 20. threaded rod; 21. scraper; 22. limit rod; 23. culture fixing tube; 24. culture plate; 25. rotating rod; 26. nut; 27. support frame; 28. spring; 29. ​​slide rail; 30. turntable; 31. inclined block; 32. extrusion rod; 33. ball bearing. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Embodiment 1

[0031] like Figure 1-Figure 7 As shown, a submerged plant culture and root secretion circulation collection device proposed by the present invention comprises a culture box 1, a plurality of connecting rods 7 are fixedly connected to the bottom of the culture box 1, a collecting box 8 is fixedly connected to the end of the connecting rod 7 away from the culture box 1, a top cover 2 is movably connected to the side of the culture box 1 away from the connecting rod 7, a lamp 14 is fixedly connected to the side of the top cover 2 close to the culture box 1, a plurality of culture fixed tubes 23 are movably connected inside the culture box 1, and a secretion collection component is arranged on the culture box 1, and the secretion collection component comprises a threaded rod 20 and an extrusion rod 32 rotatably connected inside the culture box 1, and a spring 28 and an inclined spring 28 symmetrically movably connected inside the culture box 1. Block 31, the rotation of the threaded rod 20 drives the squeezing rod 32 to rotate, and the rotation of the squeezing rod 32 slides and rotates around the special inclined block 31. The squeezing of the spring 28 makes the inclined block 31 always contact with the squeezing rod 32, so that the culture fixed tube 23 is gently shaken left and right through the rotation of the squeezing rod 32, so that the roots of the submerged plants planted in the culture fixed tube 23 and the culture solution inside the incubator 1 produce resistance friction, the interior of the incubator 1 is slidably connected with a scraper 21, and the outside of the incubator 1 is movably connected with a resin column 17. The forward and reverse rotation of the threaded rod 20 drives the scraper 21 to slide left and right, and the roots and branches and leaves fallen by the submerged plants in the incubator 1 are scraped off and collected on the resin column 17.

[0032] The interior of the incubator 1 is symmetrically fixedly connected with a slide rail 29, the interior of the slide rail 29 is slidably connected with a support frame 27, the support frame 27 is movably connected with a culture plate 24 on one side close to the top cover 2, the culture fixed tube 23 is fixedly connected to the culture plate 24, and the slide rail 29 restricts the support frame 27 so that the support frame 27 slides in the slide rail 29.

[0033] The support frame 27 is threadedly connected to the nut 26, and the number of nuts 26 is multiple groups and symmetrically distributed. The nut 26 and the culture plate 24 are movably connected, the support frame 27 and the spring 28 are fixedly connected, and the spring 28 and the slide rail 29 are fixedly connected. The support frame 27 squeezes the spring 28 during the sliding process left and right, and the rebound of the spring 28 makes the support frame 27 return to the origin.

[0034] The support frame 27 is fixedly connected to the inclined block 31 . A rotating rod 25 is rotatably connected to the outer side of the incubator 1 . A belt 19 is sleeved between the threaded rod 20 and the rotating rod 25 . The rotation of the threaded rod 20 drives the rotating rod 25 to rotate through the belt 19 .

[0035] One end of the rotating rod 25 close to the inclined block 31 is fixedly connected to the rotating disk 30, and the side of the rotating disk 30 close to the inclined block 31 is fixedly connected to the squeezing rod 32, and the side of the squeezing rod 32 close to the inclined block 31 is movably connected to the ball 33, and the ball 33 is movably connected to the inclined block 31. The rotation of the rotating rod 25 drives the squeezing rod 32 and the ball 33 to slide on the side of the inclined block 31 and squeeze the inclined block 31.

[0036] A water pump 3 is fixedly connected to the outside of the incubator 1, and a water pipe 4 is fixedly connected to the outside of the water pump 3. The water pipe 4 is fixedly connected to the incubator 1 and the collection box 8. When the water pump 3 is started, the culture fluid inside the collection box 8 is sucked through the water pipe 4 and transmitted to the incubator 1.

[0037] An air pump 5 is fixedly connected to the outside of the incubator 1, an air supply pipe 6 is fixedly connected to the outside of the air pump 5, an air outlet pipe 15 is symmetrically fixedly connected to the inside of the incubator 1, and the two air outlet pipes 15 are fixedly connected to the air supply pipe 6. The start of the air pump 5 supplies oxygen to the submerged plants through the air outlet pipe 15.

[0038] A collecting tank 16 is symmetrically provided inside the incubator 1. A first connecting pipe 10 is symmetrically fixedly connected to one side of the incubator 1 close to the top cover 2. Valves 9 are rotatably connected to the outer sides of the two first connecting pipes 10. The first connecting pipes 10 are connected to the collecting tank 16. The scraper 21 deposits the scraped impurities onto the resin column 17 through the collecting tank 16.

[0039] A third connecting tube 13 is symmetrically fixedly connected to one side of the collecting box 8 close to the incubator 1, a second connecting tube 12 is movably connected between the first connecting tube 10 and the third connecting tube 13, the second connecting tube 12 is movably connected to the resin column 17, the first connecting tube 10, the third connecting tube 13 and the second connecting tube 12 are all threadedly connected to the threaded sleeve 11, and the rotation of the threaded sleeve 11 can connect and disconnect the second connecting tube 12, the third connecting tube 13 and the first connecting tube 10.

[0040] In this embodiment, the incubator 1 of the device is made of transparent material (glass and some transparent plastic materials, such as polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC), avoid using materials that will react with root secretions). First, the top cover 2 is opened by grasping the handle on the top cover 2, and the nut 26 is turned to release the effect of the nut 26 fixed on the support frame 27. At this time, the culture plate 24 can be extracted away from the support frame 27, and the roots and root systems of the submerged plants are passed through the culture fixing tube 23, so that the roots are exposed on the outside of the bottom of the culture fixing tube 23, and the roots are filled with sand or other fixings. It is fixed in the culture fixing tube 23, and the opening of the culture fixing tube 23 is set to be wide at the top and narrow at the bottom to prevent the fixed object from leaking out. At this time, the submerged plants planted on the culture fixing tube 23 can be placed on the support frame 27 through the culture plate 24 and fixed by the nut 26. This is the initial cultivation of the submerged plants. By pouring culture solution into the culture box 1, the entire submerged plants are submerged to simulate the living state of the submerged plants. The composition of the culture solution can meet the nutritional needs of the submerged plants and can separate the roots of the submerged plants from the soil. At this time, the lamp 14 on the top cover 2 can simulate sunlight to meet the cultivation effect of the submerged plants.

[0041] When collecting secretions from the roots of submerged plants, the motor 18 is started, driving the threaded rod 20 to rotate. The rotation of the threaded rod 20 drives the rotating rod 25 to rotate through the belt 19. The rotation of the rotating rod 25 drives the squeezing rod 32 and the ball 33 to rotate accordingly. The squeezing rod 32 and the ball 33 rotate and slide around the special inclined block 31. The squeezing of the spring 28 makes the inclined block 31 always contact with the squeezing rod 32, so that the support frame 27 slides left and right on the slide rail 29. In this way, the support frame 27 drives the submerged plants planted on the culture plate 24 and the culture fixed tube 23 to follow and shake gently left and right, so that the roots of the submerged plants planted in the culture fixed tube 23 generate resistance friction with the culture solution inside the culture box 1, and are fully integrated with the culture solution. At this time, the valve 9 is opened, and the culture solution passes through the first connecting pipe 10, the second connecting pipe 12, and the first connecting pipe 10 through the collecting tank 16. The three connecting pipes 13 reach the collection box 8. When the culture solution passes through the second connecting pipe 12, the internal resin column 17 collects the root secretions integrated in the culture solution. At this time, the water pump 3 is started to collect the culture solution in the collection box 8 through the water pipe 4 and transmit it to the inside of the culture box 1 for circulation. When the collection is completed, the valve 9 is closed, and the culture solution in the collection box 8 is completely transmitted to the culture box 1 through the water pipe 4. At this time, the threaded sleeve 11 is rotated to separate the second connecting pipe 12 from the third connecting pipe 13 and the first connecting pipe 10. At this time, the resin column 17 in the second connecting pipe 12 can be easily taken out. The root secretions can be obtained by removing the resin column 17 and performing conventional elution operations. The air pump 5 is started to transmit air to the outlet pipe 15 through the air supply pipe 6, and oxygen is supplied to the submerged plants in the culture box 1 through the air outlet holes on the outlet pipe 15.

[0042] Embodiment 2

[0043] like Figure 1-Figure 7 As shown, based on the first embodiment, a motor 18 is fixedly connected to the outside of the incubator 1, the output shaft end of the motor 18 is fixedly connected to the threaded rod 20, the scraper 21 is threadedly connected to the threaded rod 20, and the inside of the incubator 1 is symmetrically fixedly connected to the limit rod 22, the scraper 21 and the limit rod 22 are slidably connected, the start of the motor 18 drives the threaded rod 20 to rotate, and the rotating threaded rod 20 causes the scraper 21 to slide on the limit rod 22.

[0044] In this embodiment, as described in the previous step, the start of the motor 18 drives the threaded rod 20 to rotate, and the scraper 21 is threadedly connected to the threaded rod 20 and is restricted by the limit rod 22, so that the forward and reverse rotation of the threaded rod 20 drives the scraper 21 to move left and right on the limit rod 22, thereby scraping off the roots and branches and leaves that have fallen from the bottom and collecting them in the collection tank 16. By taking out the resin column 17, the garbage also falls out during the taking out process.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for cultivating submerged plants and collecting their root secretions, comprising a cultivation box (1), characterized in that: The bottom of the incubator (1) is fixedly connected to a plurality of connecting rods (7); one end of the connecting rod (7) away from the incubator (1) is fixedly connected to a collecting box (8); the side of the incubator (1) away from the connecting rod (7) is movably connected to a top cover (2); the side of the top cover (2) close to the incubator (1) is fixedly connected to a lamp (14); the interior of the incubator (1) is movably connected to a plurality of culture fixed tubes (23); the incubator (1) is provided with a secretion collection assembly, the secretion collection assembly comprising a threaded rod (20) and an extrusion rod (32) rotatably connected inside the incubator (1), and a spring (28) and an inclined block (31) symmetrically movably connected inside the incubator (1); the rotation of the threaded rod (20) The extrusion rod (32) is driven to rotate, and the rotation of the extrusion rod (32) slides and rotates around the special inclined block (31). The extrusion of the spring (28) causes the inclined block (31) to always contact the extrusion rod (32), so that the culture fixed tube (23) is gently shaken left and right through the rotation of the extrusion rod (32), so that the roots of the submerged plants planted in the culture fixed tube (23) and the culture solution inside the culture box (1) generate resistance friction. The interior of the culture box (1) is slidably connected with a scraper (21), and the outside of the culture box (1) is movably connected with a resin column (17). The forward and reverse rotation of the threaded rod (20) drives the scraper (21) to slide left and right, and the roots and branches and leaves of the submerged plants in the culture box (1) are scraped off and collected on the resin column (17).

2. A submerged plant cultivation and root secretion circulation collection device according to claim 1, characterized in that: The outside of the incubator (1) is fixedly connected to a motor (18), the end of the output shaft of the motor (18) is fixedly connected to a threaded rod (20), the scraper (21) is threadedly connected to the threaded rod (20), the inside of the incubator (1) is symmetrically fixedly connected to a limit rod (22), and the scraper (21) is slidably connected to the limit rod (22).

3. The device for cultivating submerged plants and collecting their root secretions according to claim 1, characterized in that: The interior of the incubator (1) is symmetrically and fixedly connected with a slide rail (29), the interior of the slide rail (29) is slidably connected with a support frame (27), a side of the support frame (27) close to the top cover (2) is movably connected with a culture plate (24), and the culture fixed tube (23) is fixedly connected to the culture plate (24).

4. A submerged plant cultivation and root secretion circulation collection device according to claim 3, characterized in that: The support frame (27) and the nut (26) are threadedly connected, the number of the nuts (26) is multiple and symmetrically distributed, the nuts (26) and the culture plate (24) are movably connected, the support frame (27) and the spring (28) are fixedly connected, and the spring (28) and the slide rail (29) are fixedly connected.

5. The device for cultivating submerged plants and collecting their root secretions according to claim 3, characterized in that: The support frame (27) is fixedly connected to the inclined block (31); a rotating rod (25) is rotatably connected to the outer side of the incubator (1); and a belt (19) is sleeved between the threaded rod (20) and the rotating rod (25).

6. A device for cultivating submerged plants and collecting their root secretions according to claim 5, characterized in that: One end of the rotating rod (25) close to the inclined block (31) is fixedly connected to a rotating disk (30), one side of the rotating disk (30) close to the inclined block (31) is fixedly connected to an extrusion rod (32), one side of the extrusion rod (32) close to the inclined block (31) is movably connected to a ball (33), and the ball (33) is movably connected to the inclined block (31).

7. The device for cultivating submerged plants and collecting their root secretions according to claim 1, characterized in that: The outside of the incubator (1) is fixedly connected to a water pump (3), the outside of the water pump (3) is fixedly connected to a water pipe (4), and the water pipe (4) is fixedly connected to both the incubator (1) and the collection box (8).

8. The device for cultivating submerged plants and collecting their root secretions according to claim 1, characterized in that: An air pump (5) is fixedly connected to the outside of the incubator (1), an air supply pipe (6) is fixedly connected to the outside of the air pump (5), an air outlet pipe (15) is symmetrically fixedly connected to the inside of the incubator (1), and the two air outlet pipes (15) are fixedly connected to the air supply pipe (6).

9. The device for cultivating submerged plants and collecting their root secretions according to claim 1, characterized in that: The culture box (1) is symmetrically provided with a collecting tank (16) inside, and a first connecting pipe (10) is symmetrically fixedly connected to one side of the culture box (1) close to the top cover (2), and valves (9) are rotatably connected to the outer sides of the two first connecting pipes (10), and the first connecting pipes (10) and the collecting tank (16) are connected to each other.

10. A submerged plant cultivation and root secretion circulation collection device according to claim 9, characterized in that: A third connecting tube (13) is symmetrically fixedly connected to one side of the collecting box (8) close to the incubator (1); a second connecting tube (12) is movably connected between the first connecting tube (10) and the third connecting tube (13); the second connecting tube (12) is movably connected to the resin column (17); and the first connecting tube (10), the third connecting tube (13) and the second connecting tube (12) are all threadedly connected to the threaded sleeve (11).

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