A multi-channel pipette for microalgae preparation

Abstract

The present invention discloses a multi-channel pipette for microalgae preparation, which relates to the technical field of pipettes. It includes a housing, pipette tubes, a negative pressure chamber and a pull rod. There are multiple pipette tubes, which are arranged inside the housing. A circular hole is opened at the bottom of the housing. The negative pressure chamber is installed above the inside of the housing, and the pull rod is installed at the top of the housing. The bottom of the pull rod is located inside the negative pressure chamber. A piston plate is movably installed inside the negative pressure chamber. At the position corresponding to each pipette tube at the bottom of the negative pressure chamber, an inner tube is fixedly installed. A piston block is fixedly installed at the bottom of the inner tube, and a sealing ring is sleeved on the piston block. An installation mechanism and a cleaning mechanism are arranged inside the housing. The present invention achieves the effect of automatically cleaning the water remaining on the outside of the pipette tube when the pipette tube is retracted. At the same time, the sponge ring after cleaning can also be squeezed to remove water. While improving the cleaning effect of the pipette tube, it also reduces the steps required for cleaning the pipette tube.

Description

Technical Field

[0001] The present invention relates to the technical field of pipettes, and in particular to a multi-channel pipette for microalgae preparation. Background Art

[0002] A multi-channel pipette is a laboratory instrument used for accurately measuring and dispensing liquids. It can simultaneously process multiple samples or transfer the same volume of liquid in multiple reaction vessels. When preparing microalgae, a multi-channel pipette is required to perform pipetting operations on the culture solution.

[0003] After retrieval, a Chinese patent with the publication number CN220803342U discloses a multi-channel pipette, which includes a mounting shell. A negative pressure chamber and four liquid storage chambers are respectively opened inside the mounting shell. The lower surface of the mounting shell is fixedly installed with a mounting cover. Four suction nozzles are arranged inside the mounting cover. A pipe placement chamber is opened inside the housing of the mounting cover. The inner bottom walls of the four liquid storage chambers are provided with four connecting pipes respectively communicating with the four suction nozzles. The inner top wall of the negative pressure chamber is embedded with a mounting frame, and an electric push rod is fixedly installed inside the mounting frame. By setting the suction nozzle, the liquid storage chamber and the electric push rod, the contraction of the electric push rod drives the piston to move upward in the negative pressure chamber. The upward movement of the piston makes the four liquid storage chambers in negative pressure through the ventilation holes. The negative pressure liquid storage chambers suck external liquid into the liquid storage chambers through the connecting pipes and the suction nozzles, so that the pipette can achieve the purpose of simultaneously extracting and pipetting multiple liquids, and improve the pipetting efficiency of the pipette.

[0004] However, the above invention has the following deficiencies:

[0005] Although the above technology achieves the purpose of simultaneously extracting and pipetting multiple liquids, when cleaning the pipette after use, generally, clean water is extracted to clean the inside of the pipette. When extracting, the pipetting tube of the pipette will be inserted into the clean water, and there will also be a certain amount of water remaining on the outer wall of the pipetting tube after cleaning. In order to improve the cleaning effect, the water on the outer wall needs to be cleaned again. If forgotten to clean, the remaining water is likely to cause damage to the inside of the instrument and affect the use of the instrument. Summary of the Invention

[0006] The purpose of the present invention is to provide a multi-channel pipette for microalgae preparation to solve the problems raised in the above background art.

[0007] The technical solution of the present invention is: a multi-channel pipette for microalgae preparation, including a housing, pipette tubes, a negative pressure chamber, and a pull rod. There are multiple pipette tubes, which are arranged inside the housing. A circular hole is opened at the bottom of the housing. The negative pressure chamber is installed above the interior of the housing. The pull rod is installed at the top of the housing, and the bottom of the pull rod is located inside the negative pressure chamber. A piston plate is movably installed inside the negative pressure chamber. At the position corresponding to each pipette tube at the bottom of the negative pressure chamber, an inner tube is fixedly installed. A piston block is fixedly installed at the bottom of the inner tube, and a sealing ring is sleeved on the piston block. A first mounting block is fixedly sleeved on each of the multiple pipette tubes. An installation mechanism and a cleaning mechanism are arranged inside the housing;

[0008] The cleaning mechanism includes:

[0009] Sponge rings, the number of sponge rings is the same as the number of pipette tubes. The sponge rings are inlaid and movably installed inside the circular holes opened on the housing corresponding to the pipette tubes. Multiple drainage holes are opened inside the sponge rings, and drainage ports are opened on the bottom wall of the housing corresponding to the drainage holes;

[0010] Drive blocks and pressure rods. The drive blocks are rectangular blocks with inclined surfaces. There are two drive blocks and two pressure rods. The two drive blocks are symmetrically arranged left and right above the interior of the housing. The pressure rods are rectangular long rods with inclined surfaces at the top. The two pressure rods are respectively arranged below the two drive blocks;

[0011] Pressure rings and pressure plates. The number of pressure rings is the same as that of the sponge rings. The pressure rings are movably installed inside the housing at the positions corresponding to the sponge rings. The pressure plates are fixedly installed on the tops of the multiple pressure rings, and the pressure plates are fixedly connected to the pressure rods.

[0012] Preferably, the installation mechanism includes connection blocks, toggle blocks, first magnets, and second magnets. The number of connection blocks, toggle blocks, and second magnets is the same as the number of pipette tubes. Multiple adjustment slots are opened on the side wall of the housing at the positions corresponding to the first mounting blocks. The connection blocks are located inside the housing. Multiple toggle blocks are respectively fixedly installed on the multiple connection blocks. There are multiple groups of first magnets, and multiple groups of first magnets are respectively inlaid and installed inside the multiple adjustment slots. The second magnets are inlaid and installed on the connection blocks, and the poles of the second magnets close to the first magnets are of opposite polarities.

[0013] Preferably, multiple first springs are movably installed between the pressure rings and the bottom wall surface inside the housing. The pressure rings are movably installed inside the housing through the first springs. First mounting slots are opened on the inner wall of the housing at the positions corresponding to the drive blocks. The drive blocks are movably installed inside the first mounting slots. A reset plate is fixedly installed at the bottom of the drive blocks. The reset plate is a rectangular block, and a second spring is movably connected between the reset plate and the housing.

[0014] Preferably, an air injection pipe is fixedly installed on the side wall of the negative pressure chamber. One end of the air injection pipe penetrates through the side wall of the housing and is located outside the housing, and a sealing cover is movably installed on the air injection pipe through threads.

[0015] Preferably, the pull rod includes a first piston rod, a second piston rod, a third piston rod, and a connecting shaft. The first piston rod, the second piston rod, and the third piston rod are all rectangular structures. The second piston rod is arranged between the first piston rod and the third piston rod. There are two connecting shafts, and the two connecting shafts are respectively movably installed at the upper and lower ends of the second piston rod. The first piston rod and the third piston rod are respectively movably sleeved on the two connecting shafts, and the bottom of the first piston rod is fixedly connected to the piston plate.

[0016] Preferably, a handle is arranged above the housing. The pull rod is located inside the handle, and a fixing mechanism is arranged between the housing and the handle. The fixing mechanism includes a positioning block, a clamping block, a third spring, a pushing block, a third magnet, and a fourth magnet. The positioning block is fixedly installed on the top of the housing. The positioning block penetrates upward through the bottom wall surface of the handle. The clamping block is movably installed inside the positioning block. The third spring is movably installed inside the positioning block and connected to the clamping block. The pushing block is movably installed on the handle at the position corresponding to the clamping block.

[0017] Preferably, the third magnet is inlaid on the side wall of the handle, the fourth magnet is inlaid on the side wall of the housing, and the adjacent poles of the third magnet and the fourth magnet are opposite poles.

[0018] Preferably, a baffle is movably installed at the bottom of the housing. A second installation groove is opened at the middle position of the bottom of the housing. The baffle is movably installed on the second installation groove. Fifth magnets are installed on both sides inside the second installation groove and on the baffle. The fifth magnets on the baffle and the fifth magnets inside the second installation groove have opposite poles for the adjacent poles.

[0019] Preferably, scale lines are arranged on the pipette. Two sliding grooves are opened on the outer side wall of the housing corresponding to the adjustment grooves. Two push plates are movably installed between the two sliding grooves, and the two push plates are respectively located at the upper and lower ends of the sliding grooves.

[0020] Preferably, a second installation block is inlaid inside the housing corresponding to the position of the first piston rod. A resisting block is movably installed inside the second installation block. An adjusting screw rod is movably installed inside the second installation block. One end of the adjusting screw rod is located inside the resisting block and is threadedly connected to the resisting block.

[0021] The present invention hereby provides a multi-channel pipette for microalgae preparation through improvement. Compared with the prior art, it has the following improvements and advantages:

[0022] First: The present invention is provided with a cleaning mechanism. After the pipette is used, the pipette is inserted into clean water, and the pipette can be cleaned by sucking the clean water. Then, the pipette can be retracted into the interior of the housing. When the pipette moves towards the interior of the housing, the sponge ring can wipe and clean the water remaining on the outer wall of the pipette. The drain hole can store the water left after cleaning the pipette. When the pipette moves upward inside the housing, the first mounting block will squeeze the transmission block as the pipette moves. After being squeezed, the two transmission blocks will move away from each other, and then they can squeeze the pressure rod. After being squeezed, the pressure rod will move downward, thereby driving the pressing plate and the pressing ring to move downward. When the pressing ring moves downward, it can squeeze the sponge ring. At this time, the water left in the sponge ring due to cleaning the pipette will be squeezed. After the sponge ring is squeezed, the water in the drain hole can be discharged from the interior of the housing through the drain port, thus achieving the effect of automatically cleaning the water remaining on the outside of the pipette when retracting the pipette. At the same time, the sponge ring after cleaning can also be squeezed to remove water. While improving the cleaning effect of the pipette, it also reduces the steps required for cleaning the pipette.

[0023] Second: In the present invention, by adsorbing the second magnet and the first magnet together, the first mounting block and the pipette can be installed inside the housing. By moving the dial downward, the dial can drive the connecting block, the first mounting block, and the pipette to move, facilitating the removal of the pipette from the interior of the housing or retracting the pipette into the interior of the housing after use. At the same time, each pipette is controlled separately, and thus the number of corresponding pipettes can be selected according to the number of samples to be pipetted, which is convenient for use.

[0024] Third: In the present invention, the handle can be fixedly installed on the housing through the fixing mechanism. The latch limits the handle, and at this time, the handle is fixed on the housing. When the device is not in use, the third magnet can be pressed, and the third magnet will move towards the interior of the handle, thereby squeezing the latch. After being squeezed, the latch will move into the positioning block. At this time, the handle loses the force limited by the latch, and the handle will separate from the housing. Move the handle upward so that the first piston rod and the second piston rod leave the interior of the handle. At this time, the handle can be flipped towards one side of the housing, and at the same time, the second piston rod and the third piston rod will also flip. When they flip until the third magnet and the fourth magnet adsorb together, at this time, the handle will be folded and fixed on the housing, and at the same time, the pipette will also be stored inside the housing, thus achieving the effect of convenient storage.

[0025] Fourthly: In the present invention, when the amount of the culture medium pipetted by the pipette is small, the adjusting screw can be rotated. The adjusting screw will drive the abutting block to move inside the second mounting block. When the abutting block contacts the first piston rod, when the first piston rod is pulled again, the frictional force between the abutting block and the first piston rod will make the resistance of pulling the first piston rod become larger. At this time, when the same force is used to pull the first piston rod, the moving distance of the first piston rod will become smaller, and further the amount of the culture medium aspirated will also become smaller, so that the amount of the aspirated culture medium can be accurately controlled when aspirating a small amount of the culture medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 It is a front view of the overall structure in the present invention;

[0028] Figure 2 It is a front sectional view of the internal structure of the housing in the present invention;

[0029] Figure 3 In the present invention Figure 2 Enlarged view of part A;

[0030] Figure 4 In the present invention Figure 2 Enlarged view of part B;

[0031] Figure 5 It is a schematic side sectional structure view of the present invention;

[0032] Figure 6 In the present invention Figure 5 Enlarged view of part C;

[0033] Figure 7 It is a rear view of the overall structure of the present invention;

[0034] Figure 8 In the present invention Figure 2 Enlarged view of part D;

[0035] Figure 9 It is a schematic view of the overall structure of the present invention in a folded state.

[0036] Reference numerals:

[0037] 1. Housing; 2. Pipette; 3. Negative pressure chamber; 4. Handle; 5. Tie rod assembly; 6. Piston plate; 7. Inner tube; 8. Piston block; 9. Sealing ring; 10. Sponge ring; 11. First mounting block; 12. Transmission block; 13. Pressure rod; 14. Pressure ring; 15. Pressure plate; 16. Drain hole; 17. Drain port; 18. First spring; 19. First mounting groove; 20. Reset plate; 21. Second spring; 22. Injection pipe; 23. Sealing cover; 24. First piston rod; 25. Second piston rod; 26. Third piston rod; 27. Connecting shaft; 28. Adjustment groove; 29. Connecting block; 30. Pushing block; 31. First magnet; 32. Second magnet; 33. Slide groove; 34. Pushing plate; 35. Scale line; 36. Second mounting block; 37. Blocking block; 38. Adjusting screw; 39. Positioning block; 40. Clamping block; 41. Third spring; 42. Pushing block; 43. Third magnet; 44. Fourth magnet; 45. Baffle; 46. Second mounting groove; 47. Fifth magnet. Detailed implementation manner

[0038] The present invention will be described in detail below. The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] The present invention provides a multi-channel pipette for microalgae preparation by improvement. The technical solution of the present invention is as follows:

[0040] Such as Figures 1 to 9As shown in the figure, an embodiment of the present invention provides a multi-channel pipette for microalgae preparation, which includes a housing 1, pipette tubes 2, a negative pressure chamber 3, and a pull rod assembly 5. The housing 1 has a hollow structure. There are multiple pipette tubes 2, and the multiple pipette tubes 2 are evenly distributed inside the housing 1. Circular holes corresponding to the pipette tubes 2 are opened at the bottom of the housing 1, and the pipette tubes 2 can move to the outside of the housing 1 through the circular holes. The negative pressure chamber 3 has a hollow rectangular structure and is fixedly installed above the inside of the housing 1. The pull rod assembly 5 is movably installed at the top of the housing 1, and the bottom of the pull rod assembly 5 is located inside the negative pressure chamber 3. A piston plate 6 is movably installed inside the negative pressure chamber 3, and the piston plate 6 is fixedly connected to the pull rod assembly 5. Inner tubes 7 are fixedly installed at the bottom of the negative pressure chamber 3 corresponding to each pipette tube 2. The inner tubes 7 are cylindrical tubes, and the inner tubes 7 are located inside the pipette tubes 2. A piston block 8 is fixedly installed at the bottom of the inner tube 7, and a sealing ring 9 is sleeved on the piston block 8. The sealing ring 9 is in interference fit with the inner wall of the pipette tube 2. By pulling the pull rod assembly 5, the pull rod assembly 5 drives the piston plate 6 to move inside the negative pressure chamber 3, and negative pressure can be generated inside the negative pressure chamber 3. Then it can be transmitted to the inside of the pipette tube 2 through the inner tube 7. At this time, the pipette tube 2 can suck the culture solution with microalgae, and then the pipetting operation can be carried out. First mounting blocks 11 are fixedly sleeved on the multiple pipette tubes 2. The first mounting blocks 11 are rectangular blocks. An installation mechanism and a cleaning mechanism are arranged inside the housing 1;

[0041] The cleaning mechanism includes a sponge ring 10, a transmission block 12, a pressure rod 13, a pressure ring 14, and a pressure plate 15. The sponge ring 10 is in a circular ring structure, and the number of sponge rings 10 is the same as that of the pipettes 2. The sponge rings 10 are mosaically and movably installed inside the circular holes opened on the housing 1 corresponding to the pipettes 2. When the pipettes 2 are used up, the pipettes 2 are inserted into clean water, and the pipettes 2 can be cleaned by sucking the clean water. Then, the pipettes 2 can be retracted into the interior of the housing 1. During the process of the pipettes 2 moving towards the interior of the housing 1, the sponge rings 10 can wipe and clean the water remaining on the outer walls of the pipettes 2. The transmission block 12 is a rectangular block with an inclined surface. There are two transmission blocks 12 and two pressure rods 13. The two transmission blocks 12 are symmetrically arranged left and right above the interior of the housing 1. The pressure rod 13 is a rectangular long rod with an inclined surface at the top. The two pressure rods 13 are respectively arranged below the two transmission blocks 12. The pressure ring 14 is in a circular ring structure, and the number of pressure rings 14 is the same as that of the sponge rings 10. The pressure rings 14 are movably installed at the positions corresponding to the sponge rings 10 inside the housing 1. The bottom of the pressure ring 14 is in contact with the top of the sponge ring 10. The pressure plate 15 is a plate in a rectangular structure. The pressure plate 15 is fixedly installed on the tops of multiple pressure rings 14. The pressure rod 13 is fixedly connected to the pressure plate 15, and a circular hole corresponding to the pipette 2 is opened on the pressure plate 15 for the pipette 2 to pass through. Multiple drain holes 16 are opened inside the sponge ring 10. The drain holes 16 are circular holes, and the drain holes 16 can store the water left after cleaning the pipettes 2. A drain port 17 is opened on the bottom wall of the housing 1 at the position corresponding to the drain holes 16. The drain port 17 is in a circular structure. When the pipettes 2 move upward inside the housing 1, the first mounting block 11 will squeeze the transmission block 12 as the pipettes 2 move. After being squeezed, the two transmission blocks 12 will move away from each other, and thus can squeeze the pressure rod 13. After being squeezed, the pressure rod 13 will move downward, thereby driving the pressure plate 15 and the pressure ring 14 to move downward. When the pressure ring 14 moves downward, it can squeeze the sponge ring 10. At this time, the water left in the sponge ring 10 due to cleaning the pipettes 2 will be squeezed. After the sponge ring 10 is squeezed, the water inside the drain holes 16 can be discharged from the interior of the housing 1 through the drain port 17;

[0042] The installation mechanism includes a connecting block 29, a shifting block 30, a first magnet 31 and a second magnet 32. The connecting block 29 is a block with a rectangular structure. The number of the connecting block 29, the shifting block 30 and the second magnet 32 is the same as that of the pipette 2. A plurality of adjusting grooves 28 are formed in the side wall of the housing 1 corresponding to the position of the first mounting block 11. The adjusting grooves 28 are grooves with a rectangular structure. The connecting block 29 is located inside the housing 1. The shifting block 30 is a block with a rectangular structure. A plurality of shifting blocks 30 are respectively and fixedly mounted on a plurality of connecting blocks 29. There are multiple groups of the first magnets 31. Multiple groups of the first magnets 31 are respectively embedded and mounted inside a plurality of adjusting grooves 28. The second magnet 32 is embedded and mounted on the connecting block 29, and the pole of the second magnet 32 close to the first magnet 31 is the opposite pole. By adsorbing the second magnet 32 and the first magnet 31 together, the first mounting block 11 and the pipette 2 can be mounted inside the housing 1. When the shifting block 30 is moved downward, the shifting block 30 can drive the connecting block 29, the first mounting block 11 and the pipette 2 to move, which is convenient for removing the pipette 2 from the inside of the housing 1, or the pipette 2 can be retracted into the housing 1 after use. At the same time, each pipette 2 is controlled separately, and thus the number of corresponding pipettes 2 can be selected according to the number of samples to be pipetted, which is convenient for use;

[0043] A plurality of first springs 18 are movably mounted between the pressing ring 14 and the bottom wall surface inside the housing 1. The pressing ring 14 is movably mounted inside the housing 1 through the first springs 18. When the pressing ring 14 moves, it can squeeze the first springs 18. After the first mounting block 11 is separated from the transmission block 12, the first springs 18 will release the elastic force to drive the pressing ring 14 to reset, so that the sponge ring 10 resumes its shape, which is convenient for cleaning next time. A first mounting groove 19 is formed in the inner wall of the housing 1 corresponding to the position of the transmission block 12. The first mounting groove 19 is a groove with a rectangular structure. The transmission block 12 is movably mounted inside the first mounting groove 19. A reset plate 20 is fixedly mounted at the bottom of the transmission block 12. The reset plate 20 is a block with a rectangular structure. A second spring 21 is movably connected between the reset plate 20 and the housing 1. The second spring 21 can make the transmission block 12 reset after being squeezed.

[0044] An air injection pipe 22 is fixedly mounted on the side wall of the negative pressure chamber 3. The air injection pipe 22 is a circular pipe. One end of the air injection pipe 22 penetrates through the side wall of the housing 1 and is located outside the housing 1. A sealing cover 23 is movably mounted on the air injection pipe 22 through threads. After the inside of the pipette 2 is cleaned, there may still be water remaining inside the pipette 2. At this time, the sealing cover 23 can be removed from the air injection pipe 22, and then air is blown into the negative pressure chamber 3 through the air injection pipe 22, and thus the water remaining inside the pipette 2 can be blown out from the bottom of the pipette 2 through the air flow.

[0045] The pull rod assembly 5 includes a first piston rod 24, a second piston rod 25, a third piston rod 26 and a connecting shaft 27. The first piston rod 24, the second piston rod 25 and the third piston rod 26 are all of rectangular structures. The second piston rod 25 is arranged between the first piston rod 24 and the third piston rod 26. There are two connecting shafts 27. The two connecting shafts 27 are respectively movably installed at the upper and lower ends of the second piston rod 25. The first piston rod 24 and the third piston rod 26 are respectively movably sleeved on the two connecting shafts 27. The bottom of the first piston rod 24 is fixedly connected to the piston plate 6. Through the arrangement of the connecting shaft 27, the first piston rod 24, the second piston rod 25 and the third piston rod 26 can be flipped with the connecting shaft 27 as the base point. A handle 4 is arranged above the housing 1. The handle 4 is of a hollow rectangular structure. The pull rod assembly 5 is located inside the handle 4. A fixing mechanism is arranged between the housing 1 and the handle 4. The fixing mechanism includes a positioning block 39, a clamping block 40, a third spring 41, a pushing block 42, a third magnet 43 and a fourth magnet 44. The positioning block 39 is a block of hollow rectangular structure. The positioning block 39 is fixedly installed on the top of the housing 1. The positioning block 39 penetrates upward through the bottom wall surface of the handle 4. The clamping block 40 is a block of trapezoidal structure. The clamping block 40 is movably installed inside the positioning block 39. The third spring 41 is movably installed inside the positioning block 39 and connected to the clamping block 40. The pushing block 42 is movably installed on the handle 4 at the position corresponding to the clamping block 40. The third magnet 43 is embedded in the side wall of the handle 4. The fourth magnet 44 is embedded in the side wall of the housing 1. The adjacent poles of the third magnet 43 and the fourth magnet 44 are of opposite polarities. Through the fixing mechanism, the handle 4 can be fixedly installed on the housing 1. The clamping block 40 limits the handle 4. At this time, the handle 4 will be fixed on the housing 1. When the device is not in use, the third magnet 43 can be pressed. The third magnet 43 will move towards the inside of the handle 4, and then the clamping block 40 can be extruded. After the clamping block 40 is extruded, it will move into the positioning block 39. At this time, the handle 4 loses the force limited by the clamping block 40, and the handle 4 will be separated from the housing 1. Move the handle 4 upward so that the first piston rod 24 and the second piston rod 25 leave the inside of the handle 4. At this time, the handle 4 can be flipped towards one side of the housing 1. At the same time, the second piston rod 25 and the third piston rod 26 will also be flipped. When flipped until the third magnet 43 and the fourth magnet 44 are adsorbed together, at this time, the handle 4 will be folded and fixed on the housing 1. At the same time, the pipette 2 will also be stored inside the housing 1, thus achieving the effect of being convenient for storage;

[0046] A baffle plate 45 is movably installed at the bottom of the housing 1. The baffle plate 45 is a plate with a rectangular structure. A second installation groove 46 is formed at the middle position of the bottom of the housing 1. The second installation groove 46 is a groove with a rectangular structure. The baffle plate 45 is movably installed on the second installation groove 46. Fifth magnetic blocks 47 are installed on both sides inside the second installation groove 46 and on the baffle plate 45. The poles of the fifth magnetic blocks 47 on the baffle plate 45 that are close to the fifth magnetic blocks 47 inside the second installation groove 46 are of opposite polarities. The baffle plate 45 can move at the bottom of the housing 1. The baffle plate 45 seals the circular hole at the bottom of the housing 1. When the pipette 2 needs to be used, the baffle plate 45 can be slid to open the circular hole inside the housing 1, and the pipette 2 can then extend out of the inside of the housing 1. When not in use, the baffle plate 45 can seal the circular hole.

[0047] Scale lines 35 are provided on the pipette 2 to facilitate observing the amount of culture medium inhaled inside the pipette 2. Two sliding grooves 33 are formed on the outer side wall of the housing 1 corresponding to the position of the adjustment groove 28. Two push plates 34 are movably installed between the two sliding grooves 33. The push plates 34 are plates with a rectangular structure. The two push plates 34 are respectively located at the upper and lower ends of the sliding grooves 33. The push plates 34 can move on the housing 1 through the sliding grooves 33. By pushing the sliding grooves 33, multiple dial blocks 30 can be simultaneously squeezed, so that multiple pipettes 2 can be moved out of the inside of the housing 1 together at one time, or multiple pipettes 2 can be retracted into the inside of the housing 1 at the same time.

[0048] A second installation block 36 is embedded and installed inside the housing 1 corresponding to the position of the first piston rod 24. A resisting block 37 is movably installed inside the second installation block 36. The resisting block 37 is a block with a rectangular structure. An adjusting screw rod 38 is movably installed inside the second installation block 36. One end of the adjusting screw rod 38 is located inside the resisting block 37 and is threadedly connected to the resisting block 37. When the amount of culture medium pipetted through the pipette 2 is small, the adjusting screw rod 38 can be rotated, and the adjusting screw rod 38 will drive the resisting block 37 to move inside the second installation block 36. After the resisting block 37 contacts the first piston rod 24, when the first piston rod 24 is pulled again, the frictional force between the resisting block 37 and the first piston rod 24 will make the resistance of pulling the first piston rod 24 become larger. At this time, when the first piston rod 24 is pulled with the same force, the moving distance of the first piston rod 24 will become smaller, and further the amount of culture medium aspirated will also become smaller, so that the amount of inhaled culture medium can be accurately controlled when aspirating less culture medium.

[0049] Specific implementation steps: By pulling the pull rod assembly 5, the pull rod assembly 5 drives the piston plate 6 to move inside the negative pressure chamber 3, and negative pressure can be generated inside the negative pressure chamber 3. Then it can be transmitted to the inside of the pipette 2 through the inner tube 7. At this time, the pipette 2 can aspirate the culture medium with microalgae, and then the pipetting operation can be carried out.

[0050] By providing a cleaning mechanism, after the pipette 2 is used up, the pipette 2 is inserted into clean water, and the pipette 2 can be cleaned by sucking the clean water. Then, the pipette 2 can be retracted into the interior of the housing 1. During the process of the pipette 2 moving towards the interior of the housing 1, the sponge ring 10 can wipe and clean the water remaining on the outer wall of the pipette 2. The drain hole 16 can store the water left after cleaning the pipette 2. When the pipette 2 moves upward inside the housing 1, the first mounting block 11 will squeeze the transmission block 12 as the pipette 2 moves. After being squeezed, the two transmission blocks 12 will move away from each other, and then they can squeeze the pressure rod 13. After being squeezed, the pressure rod 13 will move downward, thereby driving the pressing plate 15 and the pressing ring 14 to move downward. When the pressing ring 14 moves downward, it can squeeze the sponge ring 10. At this time, the water left in the sponge ring 10 due to cleaning the pipette 2 will be squeezed out. After the sponge ring 10 is squeezed, the water in the drain hole 16 can be discharged from the interior of the housing 1 through the drain port 17. Thus, the effect of automatically cleaning the water remaining on the outside of the pipette 2 when the pipette 2 is retracted is achieved. At the same time, the sponge ring 10 after cleaning can also be squeezed to remove water. While improving the cleaning effect of the pipette 2, the steps required for cleaning the pipette 2 are also reduced.

[0051] The above description enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-tube pipette for preparing microalgae, comprising a housing (1), a pipette (2), a negative pressure chamber (3) and a tie rod assembly (5), wherein there are a plurality of pipettes (2), the pipettes (2) are arranged inside the housing (1), a circular hole is opened at the bottom of the housing (1), the negative pressure chamber (3) is installed above the inside of the housing (1), the tie rod assembly (5) is installed at the top of the housing (1), and the bottom of the tie rod assembly (5) is located inside the negative pressure chamber (3), characterized in that: A piston plate (6) is movably mounted inside the negative pressure chamber (3); an inner tube (7) is fixedly mounted at the bottom of the negative pressure chamber (3) at a position corresponding to each pipette (2); a piston block (8) is fixedly mounted at the bottom of the inner tube (7); a sealing ring (9) is sleeved on the piston block (8); a first mounting block (11) is fixedly sleeved on each of the plurality of pipettes (2); and a mounting mechanism and a cleaning mechanism are arranged inside the housing (1); Cleaning agencies include: A sponge ring (10), wherein the number of the sponge rings (10) is the same as the number of the pipettes (2), the sponge ring (10) is movably mounted inside a circular hole on the housing (1) corresponding to the pipette (2), a plurality of drainage holes (16) are formed inside the sponge ring (10), and a drainage port (17) is formed on the bottom wall of the housing (1) at a position corresponding to the drainage hole (16); A transmission block (12) and a pressure rod (13), wherein the transmission block (12) is a rectangular block with an inclined surface, and there are two transmission blocks (12) and two pressure rods (13), and the two transmission blocks (12) are symmetrically arranged above the inside of the housing (1), and the pressure rod (13) is a rectangular long rod with an inclined surface at the top, and the two pressure rods (13) are respectively arranged below the two transmission blocks (12); A pressure ring (14) and a pressure plate (15), wherein the number of the pressure rings (14) is the same as the number of the sponge rings (10), the pressure ring (14) is movably mounted inside the housing (1) at a position corresponding to the sponge ring (10), the pressure plate (15) is fixedly mounted on the top of the plurality of pressure rings (14), and the pressure plate (15) is fixedly connected to the pressure rod (13); The mounting mechanism comprises a connecting block (29), a shifting block (30), a first magnetic block (31) and a second magnetic block (32). The number of the connecting blocks (29), the shifting block (30) and the second magnetic block (32) is the same as the number of the pipettes (2). A plurality of adjustment slots (28) are provided on the side wall of the housing (1) at positions corresponding to the first mounting block (11). The connecting block (29) is located inside the housing (1). The plurality of shifting blocks (30) are respectively fixedly mounted on the plurality of connecting blocks (29). There are a plurality of groups of first magnetic blocks (31). The plurality of groups of first magnetic blocks (31) are respectively embedded and mounted inside the plurality of adjustment slots (28). The second magnetic block (32) is embedded and mounted on the connecting block (29). The second magnetic block (32) has a pole close to that of the first magnetic block (31) and has an opposite pole.

2. A multi-tube pipette for preparing microalgae according to claim 1, characterized in that: A plurality of first springs (18) are movably mounted between the pressure ring (14) and the bottom wall surface inside the housing (1); the pressure ring (14) is movably mounted inside the housing (1) via the first springs (18); a first mounting groove (19) is provided on the inner wall of the housing (1) at a position corresponding to the transmission block (12); the transmission block (12) is movably mounted inside the first mounting groove (19); a reset plate (20) is fixedly mounted on the bottom of the transmission block (12); the reset plate (20) is a rectangular block; and a second spring (21) is movably connected between the reset plate (20) and the housing (1).

3. A multi-tube pipette for preparing microalgae according to claim 1, characterized in that: An air injection pipe (22) is fixedly mounted on the side wall of the negative pressure chamber (3); one end of the air injection pipe (22) passes through the side wall of the shell (1) and is located outside the shell (1); a sealing cover (23) is movably mounted on the air injection pipe (22) via a thread.

4. A multi-tube pipette for preparing microalgae according to claim 1, characterized in that: The pull rod assembly (5) comprises a first piston rod (24), a second piston rod (25), a third piston rod (26) and a connecting shaft (27). The first piston rod (24), the second piston rod (25) and the third piston rod (26) are all rectangular structures. The second piston rod (25) is arranged between the first piston rod (24) and the third piston rod (26). There are two connecting shafts (27). The two connecting shafts (27) are movably mounted on the upper and lower ends of the second piston rod (25), respectively. The first piston rod (24) and the third piston rod (26) are movably sleeved on the two connecting shafts (27), respectively. The bottom of the first piston rod (24) is fixedly connected to the piston plate (6).

5. A multi-tube pipette for preparing microalgae according to claim 1, characterized in that: A handle (4) is arranged above the shell (1), the pull rod assembly (5) is located inside the handle (4), a fixing mechanism is arranged between the shell (1) and the handle (4), the fixing mechanism comprising a positioning block (39), a clamping block (40), a third spring (41), a push block (42), a third magnetic block (43) and a fourth magnetic block (44), the positioning block (39) is fixedly mounted on the top of the shell (1), the positioning block (39) penetrates upward through the bottom wall of the handle (4), the clamping block (40) is movably mounted inside the positioning block (39), the third spring (41) is movably mounted inside the positioning block (39) and connected to the clamping block (40), and the push block (42) is movably mounted on the handle (4) at a position corresponding to the clamping block (40).

6. A multi-tube pipette for preparing microalgae according to claim 5, characterized in that: The third magnetic block (43) is mounted on the side wall of the handle (4), and the fourth magnetic block (44) is mounted on the side wall of the housing (1). The adjacent poles of the third magnetic block (43) and the fourth magnetic block (44) are opposite poles.

7. A multi-tube pipette for preparing microalgae according to claim 1, characterized in that: A baffle (45) is movably mounted on the bottom of the shell (1); a second mounting groove (46) is provided in the middle of the bottom of the shell (1); the baffle (45) is movably mounted on the second mounting groove (46); fifth magnetic blocks (47) are mounted on both sides of the inside of the second mounting groove (46) and on the baffle (45); the fifth magnetic block (47) on the baffle (45) has a pole that is opposite to the pole of the fifth magnetic block (47) in the second mounting groove (46).

8. A multi-tube pipette for preparing microalgae according to claim 1, characterized in that: The pipette (2) is provided with a scale line (35), and two slide grooves (33) are provided on the outer wall of the housing (1) at positions corresponding to the adjustment groove (28), and two push plates (34) are movably installed between the two slide grooves (33), and the two push plates (34) are respectively located at the upper and lower ends of the slide groove (33).

9. A multi-tube pipette for preparing microalgae according to claim 1, characterized in that: A second mounting block (36) is embedded and installed in a position corresponding to the first piston rod (24) inside the housing (1); a stop block (37) is movably installed inside the second mounting block (36); an adjusting screw (38) is movably installed inside the second mounting block (36); one end of the adjusting screw (38) is located inside the stop block (37) and is threadedly connected to the stop block (37).

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