Six-joint pipettor

Abstract

The utility model discloses and provides a six-joint pipettor which comprises a shell, a mounting seat, a piston rod seat and a driving mechanism are arranged in the shell, the driving mechanism is in transmission connection with the piston rod seat, at least one U-shaped clamping groove is formed in the piston rod seat, a guide hole is formed in the position, corresponding to the U-shaped clamping groove, of the mounting seat, and the guide hole is communicated with the U-shaped clamping groove. A U-shaped clamping groove is formed in the guide hole, a piston rod is embedded in the U-shaped clamping groove, one end of the guide hole is connected with a piston cylinder, one end of the piston rod is embedded in the piston cylinder, one end of the piston cylinder is fixedly connected with an installation head, a through hole communicated with the piston cylinder is formed in the installation head, and the installation head is detachably connected with a gun head. The piston rods and the piston rod seats are connected through the U-shaped clamping grooves, when the six piston rods stretch out and draw back in the six piston cylinders respectively to take liquid and drain liquid, non-parallel central shafts caused by machining errors can be automatically eliminated, and it can be guaranteed that the six piston rods stretch out and draw back freely at the same time and cannot be held up and move.

Description

Technical Field

[0001] The present disclosure relates to the technical field of pipetting devices, and in particular, to a six-channel pipette. Background Art

[0002] A six-channel pipette is a pipetting component used in an automatic pipetting platform or system. A six-channel pipette, also known as a multi-channel micropipette, can simultaneously pipette multiple samples, greatly improving the experimental efficiency. It can measure liquids in the range of 0.1 μL - 1 mL at a time and has the ability to accurately transfer liquid ratios. It is one of the essential tools for sample collection and pipetting in research processes such as biology, chemistry, and clinical experiments.

[0003] In the existing six-channel pipette, the central axes of the 6 piston rods are not parallel due to machining errors during the process of telescopic liquid extraction and drainage, which may cause the situation of being stuck and unable to move. Summary of the Utility Model

[0004] The present disclosure provides a six-channel pipette to solve one of the technical problems recognized by the inventor.

[0005] The present disclosure provides a six-channel pipette, including: a housing, an installation seat, a piston rod seat, and a driving mechanism are arranged inside the housing. The driving mechanism is in transmission connection with the piston rod seat. At least one U-shaped card slot is opened on the piston rod seat, a guiding hole is opened at a position corresponding to the U-shaped card slot on the installation seat, a piston rod is embedded on the U-shaped card slot, one end of the piston rod penetrates through the guiding hole, one end of the guiding hole is connected with a piston cylinder, one end of the piston rod is embedded in the piston cylinder, one end of the piston cylinder is fixedly connected with a mounting head, a through hole communicating with the piston cylinder is opened on the mounting head, and a pipette tip is detachably connected to the mounting head.

[0006] Preferably, a detection board is arranged inside the housing. A wire passing board is fixedly connected to the detection board. One end of the wire passing board is fixedly connected with the installation seat. A conductive sheet is fixedly connected to the surface of the installation seat. One end of the conductive sheet is sleeved on one of the piston cylinders and is in contact with it. The conductive sheet is connected to the wire passing board through a wire.

[0007] Preferably, a pipette tip push rod is sleeved outside the piston cylinder. One end of the pipette tip push rod is fixedly connected with a connecting rod. One end of the connecting rod penetrates through the installation seat and is fixedly connected with a magnet. A pipette tip detection board is fixedly connected to the inside of the housing at a position below the magnet. At least one Hall sensor is welded on the pipette tip detection board. The Hall sensors are arranged in one-to-one correspondence with the magnets. A spring is sleeved on the connecting rod. Two ends of the spring respectively abut against the installation seat and the pipette tip push rod.

[0008] Preferably, the driving mechanism includes a motor bracket fixed inside the housing. One side of the motor bracket is fixedly connected to a motor. The output shaft of the motor is key-connected to a driving wheel. The driving wheel is connected to a driven wheel through a synchronous belt. The driven wheel is key-connected to a lead screw. The lead screw is rotatably connected to the inside of the housing through two bearing seats. A lead screw nut is threadedly connected to the lead screw. The surface of the lead screw nut is fixedly connected to a push plate. One end of the push plate is fixedly connected to the piston rod seat.

[0009] Preferably, a linear guide rail is fixedly connected to the inside of the housing. The linear guide rail is arranged parallel to the lead screw. A slider is slidably connected to the linear guide rail. The slider is fixedly connected to the lead screw nut.

[0010] Preferably, a top plate is fixedly connected to the bottom of the piston rod seat. The top plate can be abutted against the permanent magnet during the moving process.

[0011] Preferably, the connection between the piston cylinder and the mounting seat is sealed by pipe threads.

[0012] Preferably, a sealing ring and a lip seal are arranged in the guiding hole. The sealing ring and the lip seal are sleeved on the outside of the piston cylinder.

[0013] Preferably, a plurality of wire pressing plates are fixedly connected to the inside of the housing. The wire pressing plates are arranged between the gun head detection plate and the driving mechanism.

[0014] The beneficial effects of the present disclosure mainly lie in that: in the present utility model, the piston rod and the piston rod seat are connected through a U-shaped card slot. When the 6 piston rods respectively expand and contract to take and discharge liquid in the 6 piston cylinders, the non-parallelism of the central axis caused by processing errors can be automatically eliminated, and it can also ensure that the 6 piston rods can expand and contract freely at the same time without being blocked and unable to move.

[0015] The present utility model realizes the function of capacitance liquid level detection through the electrical connection between the conductive sheet and the detection plate.

[0016] It should be understood that the foregoing general description and the following detailed description are both for the purpose of illustration and example and are not necessarily restrictive of the present disclosure. The accompanying drawings incorporated in and constituting a part of the specification illustrate the subject matter of the present disclosure. At the same time, the specification and the drawings are used to explain the principles of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present disclosure 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 following drawings are some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 Schematic diagram of the three-dimensional structure of the six-channel pipette according to an embodiment of the present disclosure;

[0019] Figure 2 Schematic diagram of the internal structure of the six-channel pipette according to an embodiment of the present disclosure;

[0020] Figure 3 Schematic diagram of the sectional view of the six-channel pipette according to an embodiment of the present disclosure;

[0021] Figure 4 According to an embodiment of the present disclosure Figure 3 Partial enlarged schematic diagram at position A in;

[0022] Icon: 1 - housing; 21 - motor bracket; 22 - motor; 23 - driving wheel; 24 - driven wheel; 25 - synchronous belt; 26 - lead screw; 27 - lead screw nut; 28 - push plate; 29 - bearing seat; 210 - linear guide; 211 - slider; 3 - piston rod seat; 31 - U-shaped card slot; 32 - top plate; 4 - mounting seat; 41 - pipe thread; 42 - sealing ring; 43 - pantograph seal; 51 - piston rod; 52 - piston cylinder; 521 - mounting head; 6 - pipette tip; 71 - pipette tip push rod; 72 - connecting rod; 73 - magnet; 74 - pipette tip detection board; 75 - Hall sensor; 76 - spring; 81 - detection board; 82 - wire passing board; 83 - conductive sheet; 9 - wire pressing board. Detailed implementation manners

[0023] Next, the technical solutions of the present disclosure will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments.

[0024] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.

[0025] In the description of the present disclosure, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present disclosure. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0026] In the description of the present disclosure, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations.

[0027] Embodiment

[0028] As Figures 1-4 shown, this embodiment provides a six-channel pipette, including a housing 1. The housing 1 includes a base and an outer cover. A driving mechanism, a piston rod seat 3, and a mounting seat 4 are arranged inside the housing 1. The driving mechanism is in transmission connection with the piston rod seat 3 and is used to drive the piston rod seat 3 to move up and down. At least one U-shaped card slot 31 is arranged in parallel on the piston rod seat 3. In this embodiment, the number of U-shaped card slots 31 is 6. The mounting seat 4 is fixedly connected to one end of the housing 1 by bolts. At least one guiding hole is provided at a position corresponding to the U-shaped card slot 31 on the mounting seat 4. In this embodiment, the number of guiding holes is the same as the number of U-shaped card slots 31 and they correspond one by one. A piston rod 51 is embedded in the U-shaped card slot 31. There are 6 piston rods 51. One end of the piston rod 51 is embedded in the guiding hole. A piston cylinder 52 is fixedly installed at the end of the guiding hole. The piston rod 51 is inserted into the piston cylinder 52. The piston cylinder 52 is arranged outside the housing 1. A spherical mounting head 521 is integrally formed at one end of the piston cylinder 52 away from the piston rod 51. A through hole communicating with the piston cylinder 52 is provided in the middle of the mounting head 521. A pipette tip 6 is detachably connected to the mounting head 521. One end of the mounting head 521 and the pipette tip 6 are connected by interference fit. When installing the pipette tip 6, the entire six-channel pipette is driven to move above the pipette tip 6 by the moving mechanism of an automatic liquid transfer platform or system, and then the six-channel pipette is driven to move downward so that the mounting head 521 is embedded in the pipette tip 6, and the installation of the pipette tip 6 is realized through interference fit. After installing the pipette tip 6, the pipette tip 6 is moved into the solution, and the piston rod 51 is driven to move upward by the driving mechanism, and then the liquid can be sucked into the pipette tip 6 to complete the liquid suction work. When the pipette tip 6 sucks a set volume of liquid, the entire six-channel pipette is lifted and moved to the position where liquid needs to be discharged, and the driving mechanism drives the piston rod 51 to move downward, and then the liquid can be discharged into the designated position to complete the liquid discharge work. The piston rod 51 and the piston rod seat 3 are connected through the U-shaped card slot 31. When the 6 piston rods 51 respectively expand and contract to suck and discharge liquid in the 6 piston cylinders 52, the non-parallelism of the central axis caused by processing errors can be automatically eliminated, and it can also ensure that the 6 piston rods 51 can freely expand and contract simultaneously without being blocked and unable to move.

[0029] Specifically, a detection board 81 is arranged inside the housing 1. The detection board 81 is fixedly installed with a wire passing board 82 by bolts. One end of the wire passing board 82 is fixedly installed on the surface of the mounting seat 4 by bolts. A conductive sheet 83 is fixedly connected to the surface of the mounting seat 4 by screws. The conductive sheet 83 is connected to the wire passing board 82 through a wire, realizing the connection between the conductive sheet 83 and the detection board 81. One end of the conductive sheet 83 is in a circular ring structure. The circular ring structure of the conductive sheet 83 is sleeved outside one of the piston cylinders 52 and contacts the piston cylinder 52 to realize the conduction between the conductive sheet 83 and one of the piston cylinders 52. When the piston cylinder 52 is inserted into the gun head 6, the gun head 6 is slowly inserted into the liquid. When the gun head 6 touches the liquid surface, the capacitance value of the liquid relative to the ground is conducted to the detection board 81 through the gun head 6, the piston cylinder 52, the conductive sheet 83, and the wire passing board 82. It is conducted to the detection chip through the capacitance values on the gun head 6, the piston cylinder 52, the conductive sheet 83, the cable, and the liquid for analysis. The detection chip detects the liquid level position through the capacitance change. After being inserted to a certain depth at the liquid level position, the driving mechanism drives the piston rod 51 to move upward, and the liquid suction work can be completed.

[0030] In one embodiment, a gun head push rod 71 is sleeved outside the piston cylinder 52. One end of the gun head push rod 71 close to the mounting seat 4 is fixedly connected with a connecting rod 72. One end of the connecting rod 72 penetrates through the mounting seat 4 and is fixedly connected with a magnet 73. A gun head detection board 74 is arranged inside the housing 1 below the magnet 73. At least one Hall sensor 75 is welded on the gun head detection board 74. In this embodiment, the number of Hall sensors 75 is 6, and they are arranged side by side on the gun head detection board 74. When the piston cylinder 52 is inserted into the gun head 6, the gun head 6 will squeeze the gun head push rod 71, pushing the gun head push rod 71 to move upward. At this time, the connecting rod 72 drives the magnet 73 to move synchronously. When the magnet 73 moves above the Hall sensor 75, the Hall sensor 75 detects the position of the magnet 73, and it can be determined that the gun head 6 has been inserted into the piston cylinder 52.

[0031] Specifically, the driving mechanism includes a motor bracket 21 fixedly installed inside the housing 1 by bolts. The motor bracket 21 is fixedly installed with a motor 22 by bolts. The output shaft of the motor 22 is key-connected with a driving wheel 23. The driving wheel 23 is drivingly connected with a driven wheel 24 through a synchronous belt 25. The driven wheel 24 is key-connected with a lead screw 26. The lead screw 26 is rotatably connected to the inside of the housing 1 through two bearing seats 29. A lead screw nut 27 is threadedly connected to the lead screw 26. The surface of the lead screw nut 27 is fixedly connected with a push plate 28. One end of the push plate 28 is fixedly connected with the piston rod seat 3. The motor 22 drives the driving wheel 23 to rotate, drives the driven wheel 24 to rotate, thereby drives the lead screw 26 to rotate. The lead screw nut 27 moves back and forth in the direction of the lead screw 26, drives the push plate 28 to move back and forth, thereby drives the piston rod seat 3 to move. The piston rod 51 follows the piston rod seat 3 to move, so as to realize the driving of the piston rod 51.

[0032] Further, a linear guide rail 210 is fixedly connected inside the housing 1. The linear guide rail 210 is arranged parallel to the lead screw 26. A slider 211 is slidably connected to the linear guide rail 210. The slider 211 is fixedly connected with the lead screw nut 27. By adding the linear guide rail 210 and the slider 211 for auxiliary support and guidance, the push plate 28 moves more smoothly and in a more accurate direction, avoiding jamming.

[0033] Further, a top plate 32 is integrally formed at the bottom of the piston rod seat 3. The top plate 32 can be abutted against the magnet 73 during the moving process. When the gun head 6 needs to be removed after use, the driving mechanism drives the piston rod seat 3 to move towards the magnet 73. The top plate 32 pushes the magnet 73 to move, drives the gun head push rod 71 to move towards the gun head 6 through the connecting rod 72. The gun head push rod 71 pushes the gun head 6 away from the mounting head 521, completing the disassembly of the gun head 6. After the driving mechanism drives the piston rod seat 3 away from the magnet 73, the spring 76 restores the position of the gun head push rod 71.

[0034] Further, the connection between the piston cylinder 52 and the mounting seat 4 is sealed by a pipe thread 411.

[0035] Furthermore, a sealing ring 42 and a pantograph seal 43 are arranged in the guiding hole. The sealing ring 42 and the pantograph seal 43 are sleeved on the outer side of the piston cylinder 52.

[0036] The piston cylinder 52 is fixedly sealed with the mounting seat 4 through the pipe thread 411. At the same time, the mounting seat 4 is provided with double seals of the sealing ring 42 and the pantograph seal 43, ensuring the sealing performance when the piston rod 51 expands and contracts in the piston cylinder 52 to take in and discharge liquid.

[0037] Moreover, the piston rod seat 3, the ferro-free piston seal 43, and the sealing ring 42 are made of non-conductive materials. Reducing the number or surface area of conductive parts can improve the sensitivity and stability of capacitance liquid level detection.

[0038] Furthermore, several wire pressing plates 9 are fixedly connected inside the housing 1 by bolts. The wire pressing plates 9 are arranged between the gun head detection board 74 and the driving mechanism. The wires inside the housing 1 are fixed by the wire pressing plates 9 to prevent them from winding around each other, improving the aesthetics of the internal layout.

[0039] The working principle of the present utility model: The motor 22 drives the lead screw 26 to rotate, driving the push plate 28 to move. When the piston rod 51 moves to the lowest position inside the piston cylinder 52, the entire six-channel pipette moves above the gun head 6. The six-channel pipette moves downward, causing the mounting head 521 to be inserted into the gun head 6 and have an interference fit with the gun head 6. When inserting the gun head 6, the gun head 6 will push up the gun head push rod 71, driving the magnet 73 to move above the Hall sensor 75. When the Hall sensor 75 detects a signal, it indicates that the piston cylinder 52 has been inserted into the gun head 6; The gun head 6 is moved above the liquid and slowly inserted into the liquid. When the gun head 6 touches the surface of the liquid, the capacitance value of the liquid relative to the ground is conducted to the detection board 81 through the gun head 6, the piston cylinder 52, the conductive sheet 83, and the wire passing board 82, and the liquid level position can be judged. After inserting a certain depth into the liquid level position, the piston rod 51 moves upward driven by the motor 22, and the liquid can be sucked into the gun head 6 to complete the liquid suction operation. When the gun head 6 sucks the set volume of liquid, the entire six-channel pipette is lifted and moved to the position where liquid needs to be discharged. The motor 22 drives the piston rod 51 to move downward, and the liquid can be discharged into the designated position to complete the liquid discharge operation; After the liquid suction and discharge are completed, when the gun head 6 needs to be removed, click to drive the piston rod 51 to move downward continuously. The piston rod seat 3 will touch the magnet 73, pushing the magnet 73 to move downward, driving the gun head push rod 71 through the connecting rod 72 to push the gun head 6, causing the gun head 6 to disengage from the piston cylinder 52.

[0040] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present disclosure, not to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A six-way pipette, characterized in that: The invention comprises: a shell, a mounting seat, a piston rod seat and a driving mechanism are arranged in the shell, the driving mechanism is drivingly connected with the piston rod seat, the piston rod seat is provided with at least one U-shaped slot, the mounting seat is provided with a guide hole at a position corresponding to the U-shaped slot, a piston rod is embedded in the U-shaped slot, one end of the piston rod passes through the guide hole, one end of the guide hole is connected to a piston cylinder, one end of the piston rod is embedded in the piston cylinder, one end of the piston cylinder is fixedly connected with a mounting head, the mounting head is provided with a through hole which passes through the piston cylinder, and the mounting head is detachably connected with a gun head.

2. A six-way pipette according to claim 1, characterized in that: A detection plate is arranged in the shell, a wire-passing plate is fixedly connected to the detection plate, one end of the wire-passing plate is fixedly connected to the mounting seat, a conductive sheet is fixedly connected to the surface of the mounting seat, one end of the conductive sheet is sleeved on one of the piston cylinders and contacts therewith, and the conductive sheet is connected to the wire-passing plate through a wire.

3. A six-way pipette according to claim 1, characterized in that: The outer side of the piston cylinder is sleeved with a gun tip push rod, one end of the gun tip push rod is fixedly connected to a connecting rod, one end of the connecting rod passes through the mounting seat and is fixedly connected to a magnet, the inside of the shell is located below the magnet and is fixedly connected to a gun tip detection plate, at least one Hall sensor is welded on the gun tip detection plate, the Hall sensor is arranged one-to-one with the magnet, the connecting rod sleeve is provided with a spring, the two ends of the spring are respectively set against the mounting seat and the gun tip push rod.

4. A six-way pipette according to claim 1, characterized in that: The driving mechanism includes a motor bracket fixed inside the shell, one side of the motor bracket is fixedly connected to a motor, the output shaft of the motor is keyed to a driving wheel, the driving wheel is connected to a passive wheel through a synchronous belt transmission, the passive wheel is keyed to a lead screw, the lead screw is rotatably connected to the shell through two bearing seats, a lead screw nut is threadedly connected to the lead screw, a push plate is fixedly connected to the surface of the lead screw nut, and one end of the push plate is fixedly connected to the piston rod seat.

5. A six-way pipette according to claim 4, characterized in that: A linear guide is fixedly connected inside the shell, the linear guide is arranged parallel to the lead screw, a slider is slidably connected to the linear guide, and the slider is fixedly connected to the lead screw nut.

6. A six-way pipette according to claim 3, characterized in that: The bottom of the piston rod seat is fixedly connected with a top plate, and the top plate can be arranged against the magnetic steel during movement.

7. A six-way pipette according to claim 1, characterized in that: The connection between the piston cylinder and the mounting seat is sealed by a pipe thread.

8. A six-way pipette according to claim 1, characterized in that: A sealing ring and a flood seal are arranged in the guide hole, and the sealing ring and flood seal are arranged on the outside of the piston cylinder.

9. A six-way pipette according to claim 3, characterized in that: A plurality of wire pressing plates are fixedly connected to the interior of the shell, and the wire pressing plates are arranged between the gun head detection plate and the driving mechanism.

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