An adjustable-pitch pipette

Abstract

This utility model relates to the field of experimental equipment in the medical field, specifically disclosing an adjustable-pitch pipette. The lifting base has a longitudinal limiting shaft, which limits its vertical movement. A first pitch-changing shaft rotates at its upper limit on the lifting base, and the suction port moves laterally within its limit. A first transmission component is fixedly mounted on the first pitch-changing shaft, and the first and second transmission components rotate in a coordinated manner. The second transmission component rotates synchronously with the longitudinal limiting shaft. The circumferential surface of the first pitch-changing shaft has a spirally arranged first pitch-changing groove. The suction port is fixedly equipped with a channel movable slider, which slides within the first pitch-changing groove. The suction rod slides within its limit within the suction chamber, and the channel seat moves laterally within its limit. This utility model, through the cooperation of the first pitch-changing shaft and the channel seat, allows the spirally shaped first pitch-changing shaft to adjust the pitch of the movable suction port and the channel seat during rotation. This reduces the overall size of the machine, significantly improves space utilization, and increases pipetting accuracy.

Description

Technical Field

[0001] This utility model relates to the field of experimental equipment in the medical field, and in particular to a multi-function liquid displacement device. Background Technology

[0002] In medical experiments and production processes, the transfer of liquids such as reagents or samples is frequently required. However, the types of reagents are diverse, the transfer frequency is high, and the requirements for liquid volume accuracy are stringent. Therefore, to address situations with varying liquid dispensing and transfer intervals, variable-pitch mechanisms are added to pipetting nozzles in series, allowing the pipetting mechanism to adapt to various pipetting scenarios. Due to its high efficiency, high precision, and low error rate, multi-channel variable-pitch pipetting mechanisms are widely used in medical automation equipment.

[0003] Most variable-pitch mechanisms on the market only change the pitch of the pipette tip mechanism. The internal liquid aspiration mechanism still uses a fixed-pitch pump, which is connected to the pipette tip mechanism through a capillary tube. This results in a longer liquid aspiration pipeline path and insufficient liquid transfer accuracy.

[0004] The technical problem to be solved in this application is: how to solve the synchronous pitch change of the components that realize the liquid extraction action and the nozzle tip. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide an adjustable spacing pipette.

[0006] The technical solution adopted by this utility model is as follows: an adjustable pitch pipette, including a liquid-drawing pitch-changing assembly and a single-channel component. The liquid-drawing pitch-changing assembly includes a lifting seat, a liquid-drawing movable seat, a first pitch-changing shaft, a first transmission component, and a second transmission component. The lifting seat is provided with a longitudinal limiting shaft, and the lifting seat is limited to lifting and lowering along the longitudinal limiting shaft. The first pitch-changing shaft rotates at the upper limit of the lifting seat, and the liquid-drawing movable seat moves laterally at the upper limit of the lifting seat. The first transmission component is fixedly installed on the first pitch-changing shaft, and the first transmission component and the second transmission component are in rotational transmission cooperation. The second transmission component rotates synchronously with the longitudinal limiting shaft. The circumferential surface of the first pitch-changing shaft is provided with a spirally arranged first pitch-changing groove. The liquid-drawing movable seat is fixedly provided with a channel movable slider, and the channel movable slider slides within the first pitch-changing groove. The single-channel component includes a channel seat, a liquid-drawing rod, and a liquid-drawing chamber. The liquid-drawing chamber is located inside the channel seat, and the liquid-drawing rod slides within the liquid-drawing chamber. The liquid-drawing rod is fixedly connected to the liquid-drawing movable seat, and the channel seat moves laterally at the upper limit.

[0007] In some embodiments, both the first and second transmission components are gears, which mesh with each other, and the second transmission component is movably sleeved on the longitudinal limiting shaft.

[0008] In some implementations, the closer to the center of the first pitch axis, the larger the angle between the axial direction of the first pitch groove and the axial direction of the first pitch axis. The function of the multiple first pitch grooves on the first pitch axis is to ensure that each individual channel maintains an equal distance between pitch grooves during the pitch change process.

[0009] In some embodiments, a channel pitch-changing assembly is included. The channel pitch-changing assembly includes a second pitch-changing shaft, a third transmission member, and a fourth transmission member. The third transmission member is fixedly mounted on the second pitch-changing shaft. The third transmission member and the fourth transmission member are in rotational transmission cooperation. The fourth transmission member rotates synchronously with the longitudinal limiting shaft. The circumferential surface of the second pitch-changing shaft is provided with a spirally arranged second pitch-changing groove. The channel seat is fixedly provided with a channel movable slider. The channel movable slider slides within the second pitch-changing groove.

[0010] In some embodiments, both the third and fourth transmission components are gears, and they mesh with each other. The closer to the center of the second pitch-changing shaft, the larger the angle between the axial direction of the second pitch-changing groove and the axial direction of the second pitch-changing shaft. This is to achieve synchronous pitch changing with equal spacing between each single channel.

[0011] In some embodiments, the liquid-drawing movable seat is configured in a "C" shape, the liquid-drawing movable seat partially surrounds the first variable pitch shaft, the four corners of the lifting seat are respectively movably sleeved on the outer wall of the longitudinal limiting shaft, and the second transmission component is arranged between the connection positions of the two lifting seats on the same side and the longitudinal limiting shaft.

[0012] In some embodiments, a cavity frame assembly, a liquid suction pitch assembly, and a channel pitch assembly are disposed within the cavity frame assembly, and the channel seat is limited to lateral movement within the cavity frame assembly.

[0013] In some embodiments, the channel seat is provided with a channel limiting shaft, which is arranged laterally and is fixedly connected to the cavity frame assembly. The channel seat is movably sleeved on the channel limiting shaft and moves at the upper limit of the channel limiting shaft.

[0014] In some embodiments, the cavity frame assembly is provided with a movable limiting member, which is fixedly connected to the cavity frame assembly. The movable limiting member is sleeved on the outer wall of the longitudinal limiting shaft, and the longitudinal limiting shaft is limited to rotate within the movable limiting member.

[0015] In some embodiments, the liquid pumping pitch-changing assembly includes a lifting drive element and a pitch-changing drive element. The pitch-changing drive element drives the longitudinal limiting shaft to rotate. The lifting seat is provided with a lifting nut sleeve and a lifting screw. The lifting nut sleeve is fixedly connected to the lifting seat. The lifting nut sleeve and the lifting screw are threadedly engaged. The lifting drive element drives the lifting screw to rotate.

[0016] The beneficial effects of this utility model are as follows:

[0017] This adjustable-pitch pipette, through the cooperation of a first pitch-changing shaft and a channel seat, allows the spiral-shaped first pitch-changing shaft to adjust the pitch between the movable suction seat and the channel seat during rotation. It also improves the suction method by raising and lowering the suction rod to achieve negative pressure suction operation. The overall size of the machine is reduced, the space utilization is greatly improved, the pipetting accuracy is higher, the application scenarios are wider, and the operation is more stable and reliable. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of the cavity frame assembly;

[0020] Figure 3 This is a schematic diagram of the structure of the first pitch shaft;

[0021] Figure 4 This is a schematic diagram of the structure of a single-channel component;

[0022] The labels and names in the diagram correspond as follows: 1. Cavity frame assembly; 2. Liquid extraction pitch-changing assembly; 3. Channel pitch-changing assembly; 11. Moving limit component; 21. Lifting seat; 22. Lifting drive element; 23. Pitch-changing drive element; 24. Liquid extraction movable seat; 25. First pitch-changing shaft; 26. First transmission component; 27. Second transmission component; 211. Lateral limit shaft; 212. Longitudinal limit shaft; 213. Lifting nut sleeve; 214. Lifting screw; 251. First pitch-changing groove; 31. Second pitch-changing shaft; 32. Single channel component; 33. Third transmission component; 34. Fourth transmission component; 321. Channel seat; 322. Liquid extraction rod; 323. Liquid extraction plug; 324. Liquid extraction chamber; 325. Channel limit shaft. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1 This utility model provides a technical solution: an adjustable-pitch pipette, comprising a cavity frame assembly 1, a liquid suction pitch variable assembly 2, and a channel pitch variable assembly 3. The liquid suction pitch variable assembly 2 and the channel pitch variable assembly 3 are disposed within the cavity frame assembly 1.

[0025] Please see Figure 2The liquid extraction variable pitch assembly 2 includes a lifting seat 21, a lifting drive element 22, a variable pitch drive element 23, a liquid extraction movable seat 24, a first variable pitch shaft 25, a first transmission element 26, and a second transmission element 27. The liquid extraction movable seat 24 and the first variable pitch shaft 25 are respectively mounted on the lifting seat 21. The lifting seat 21 is provided with a transverse limiting shaft 211 and a longitudinal limiting shaft 212. Several liquid extraction movable seats 24 move at the upper limit on the transverse limiting shaft 211. The transverse limiting shaft 211 is fixedly connected to the lifting seat 21. The two ends of the lifting seat 21 move at the upper limit on the longitudinal limiting shaft 212. The longitudinal limiting shaft 212 is limited to rotate on the cavity frame assembly 1.

[0026] Please see Figure 2 and Figure 3 The first variable pitch shaft 25 rotates at the upper limit on the lifting seat 21. The first transmission component 26 is fixedly installed at one end of the first variable pitch shaft 25. The first transmission component 26 and the second transmission component 27 are in transmission cooperation. When the second transmission component 27 rotates, the first transmission component 26 rotates accordingly. Specifically, both the first transmission component 26 and the second transmission component 27 are gears. The first transmission component 26 and the second transmission component 27 are meshed together. The second transmission component 27 is movably sleeved on the longitudinal limiting shaft 212. The cross section of the longitudinal limiting shaft 212 is non-circular. The second transmission component 27 is in the upper limit of the longitudinal limiting shaft 212 but cannot move radially. There is no relative radial movement between the second transmission component 27 and the longitudinal limiting shaft 212. The second transmission component 27 and the longitudinal limiting shaft 212 rotate coaxially. The circumferential surface of the first pitch shaft 25 is provided with first pitch grooves 251 corresponding to the number of liquid-drawing movable seats 24. Each liquid-drawing movable seat 24 is fixedly provided with a channel movable slider. The channel movable slider slides within the first pitch grooves 251. The first pitch grooves 251 are spirally arranged. The closer to the center of the first pitch shaft 25, the larger the angle between the axial direction of the first pitch groove 251 and the axial direction of the first pitch shaft 25. That is, when the first pitch shaft 25 rotates by a certain angle, the liquid-drawing movable seat 24 closest to the end of the first pitch shaft 25 moves the greatest distance, and the liquid-drawing movable seat 24 closest to the center of the first pitch shaft 25 moves the least distance. This ensures that the distance between each liquid-drawing movable seat 24 remains consistent after pitch change. The function of the multiple first pitch grooves on the first pitch shaft is to ensure that each single channel maintains an equal pitch during pitch change.

[0027] The variable pitch drive element 23 and the lifting drive element 22 are motors that rotate at their output ends. The fixed ends of the variable pitch drive element 23 and the lifting drive element 22 are respectively fixedly mounted on the cavity frame assembly 1. The variable pitch drive element 23 drives the longitudinal limit shaft 212 to rotate through the synchronous pulley and synchronous belt, thereby realizing the rotation of the longitudinal limit shaft 212 by the variable pitch drive element 23. The lifting seat 21 is provided with a lifting nut sleeve 213 and a lifting screw 214. The lifting nut sleeve 213 is fixedly connected to the lifting seat 21, and the lifting nut sleeve 213 and the lifting screw 214 are threadedly engaged. The lifting drive element 22 drives the lifting screw 214 to rotate through the synchronous pulley and synchronous belt, thereby realizing the lifting drive element 22 driving the lifting seat 21 to rise and fall.

[0028] The variable pitch drive element 23 drives the longitudinal limiting shaft 212 to rotate, the second transmission element 27 to rotate, and the first transmission element 26 to rotate accordingly, thereby realizing the rotation of the first variable pitch shaft 25. The liquid-drawing movable seat 24 moves along the first variable pitch groove 251, thereby realizing stepless adjustment of the distance between the liquid-drawing movable seats 24. The lifting drive element 22 drives the lifting seat 21 to rise and fall, and the liquid-drawing movable seat 24 and the first variable pitch shaft 25 move accordingly. Since the second transmission element 27 is engaged with the first transmission element 26, the second transmission element 27 moves accordingly.

[0029] To facilitate the connection between the liquid-drawing movable seat 24 and the first variable-pitch shaft 25, in this embodiment, preferably, the liquid-drawing movable seat 24 is C-shaped, partially enclosing the first variable-pitch shaft 25. For the overall lifting and lowering displacement of the liquid-drawing movable seat 24, the four corners of the lifting seat 21 are movably fitted onto the outer wall of the longitudinal limiting shaft 212, and the connection position between the lifting seat 21 and the longitudinal limiting shaft 212 is located on one side of the liquid-drawing movable seat 24. The second transmission member 27 is located between the connection positions of the two lifting seats 21 and the longitudinal limiting shaft 212 on the same side.

[0030] Please see Figure 2 The channel pitch-changing assembly 3 includes a second pitch-changing shaft 31, multiple single-channel components 32, a third transmission component 33, and a fourth transmission component 34. The third transmission component 33 is fixedly disposed at one end of the second pitch-changing shaft 31, and the fourth transmission component 34 is movably sleeved on the circumferential surface of the longitudinal limiting shaft 212. The third transmission component 33 and the fourth transmission component 34 are in rotational transmission cooperation. The fourth transmission component 34 is coaxial with the longitudinal limiting shaft 212 and rotates synchronously. The fourth transmission component 34 slides at the upper limit on the longitudinal limiting shaft 212. Specifically, the third transmission component 33 and the fourth transmission component 34 are both gears, and the third transmission component 33 and the fourth transmission component 34 are meshed together.

[0031] Please see Figure 4The single-channel component 32 includes a channel seat 321, a suction rod 322, a suction chamber 324, and a suction plug 323. The suction chamber 324 is located inside the channel seat 321. The suction rod 322 slides within the suction chamber 324. The suction plug 323 is located at the bottom of the channel seat 321 and communicates with the suction chamber 324. The suction rod 322 changes the pressure within the suction chamber 324 to achieve the operation of suction and dispensing liquid, similar to the principle of a syringe. The suction rod 322 is fixedly connected to the suction movable seat 24, so the suction movable seat 24 can push and pull the suction rod 322 within the suction chamber 324 when it is raised or lowered.

[0032] The circumferential surface of the second pitch shaft 31 is provided with a second pitch groove corresponding to the number of channel seats 321. The channel seat 321 is fixedly provided with a channel movable slider. The channel movable slider slides within the second pitch groove. The second pitch groove is spirally arranged. The closer it is to the center of the second pitch shaft 31, the larger the angle between the axial direction of the second pitch groove and the axial direction of the second pitch shaft 31. That is, when the second pitch shaft 31 rotates by a certain angle, the channel seat 321 farthest from the center of the second pitch shaft 31 moves the greatest distance, and the channel seat 321 closest to the center of the second pitch shaft 31 moves the least distance. This ensures that the distance between each channel seat 321 is consistent after pitch change, realizing synchronous pitch change with equal spacing for each single channel. The channel seat 321 is provided with a channel limiting shaft 325, which is arranged laterally and is fixedly connected to the cavity frame assembly 1. The channel seat 321 is movably sleeved on the channel limiting shaft 325. The channel seat 321 moves at the upper limit of the channel limiting shaft 325. The channel limiting shaft 325 can restrict the lateral movement direction of the channel seat 321, so no matter how the channel seat 321 moves, the relative height between the channel seat 321 and the longitudinal limiting shaft 212 remains unchanged.

[0033] The working principle and usage process of this utility model are as follows: During the pitch-changing process, the pitch-changing drive element 23 drives the longitudinal limiting shaft 212 to rotate, the second transmission element 27 and the fourth transmission element 34 rotate, and the first transmission element 26 and the third transmission element 33 follow suit, thereby realizing the rotation of the first pitch-changing shaft 25 and the second pitch-changing shaft 31. The liquid-drawing movable seat 24 moves along the first pitch-changing groove 251, and the channel seat 321 moves along the second pitch-changing groove, thereby adjusting the distance between each liquid-drawing movable seat 24 and each channel seat 321. During the liquid-drawing process, the lifting drive element 22 drives the lifting seat 21 to rise and fall, the liquid-drawing movable seat 24 moves accordingly, and the liquid-drawing rod 322 rises and falls, thereby changing the pressure in the liquid-drawing chamber 324.

[0034] In order to limit the movement distance of the lifting seat 21, the cavity frame assembly 1 is provided with a moving limit member 11. The moving limit member 11 is fixedly connected to the cavity frame assembly 1. The moving limit member 11 is sleeved on the outer wall of the longitudinal limiting shaft 212, and the longitudinal limiting shaft 212 is limited to rotate within the moving limit member 11.

[0035] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An adjustable-pitch pipette, characterized in that, The device includes a liquid-drawing pitch-changing assembly (2) and multiple single-channel components (32). The liquid-drawing pitch-changing assembly (2) includes a lifting seat (21), a liquid-drawing movable seat (24), a first pitch-changing shaft (25), a first transmission component (26), and a second transmission component (27). The lifting seat (21) is provided with a longitudinal limiting shaft (212), and the lifting seat (21) is limited to lifting and lowering along the longitudinal limiting shaft (212). The first pitch-changing shaft (25) is limited to rotating on the lifting seat (21), and the liquid-drawing movable seat (24) is limited to lateral movement on the lifting seat (21). The first transmission component (26) is fixedly mounted on the first pitch-changing shaft (25), and the first transmission component (26) and the second transmission component (27) are rotated and driven together. The second transmission component (27) rotates synchronously with the longitudinal limiting shaft (212). The circumferential surface of the first variable pitch shaft (25) is provided with a spirally arranged first variable pitch groove (251). The liquid-drawing movable seat (24) is fixedly provided with a channel movable slider. The channel movable slider slides within the first variable pitch groove (251). The single-channel component (32) includes a channel seat (321), a liquid-drawing rod (322), and a liquid-drawing chamber (324). The liquid-drawing chamber (324) is located inside the channel seat (321). The liquid-drawing rod (322) slides within the liquid-drawing chamber (324). The liquid-drawing rod (322) is fixedly connected to the liquid-drawing movable seat (24). The channel seat (321) is limited to lateral movement.

2. The adjustable-pitch pipette according to claim 1, characterized in that, The first transmission component (26) and the second transmission component (27) are both gears. The first transmission component (26) and the second transmission component (27) mesh with each other. The second transmission component (27) is movably sleeved on the longitudinal limiting shaft (212).

3. The adjustable-pitch pipette according to claim 1, characterized in that, The closer to the center of the first pitch shaft (25), the larger the angle between the axial direction of the first pitch groove (251) and the axial direction of the first pitch shaft (25).

4. An adjustable-pitch pipette according to claim 1, characterized in that, The system includes a channel pitch-changing assembly (3), which includes a second pitch-changing shaft (31), a third transmission member (33), and a fourth transmission member (34). The third transmission member (33) is fixedly mounted on the second pitch-changing shaft (31). The third transmission member (33) and the fourth transmission member (34) are in rotational transmission cooperation. The fourth transmission member (34) rotates synchronously with the longitudinal limiting shaft (212). The circumferential surface of the second pitch-changing shaft (31) is provided with a spirally arranged second pitch-changing groove. The channel seat (321) is fixedly provided with a channel movable slider. The channel movable slider slides within the second pitch-changing groove.

5. An adjustable-pitch pipette according to claim 4, characterized in that, The third transmission component (33) and the fourth transmission component (34) are both gears. The third transmission component (33) and the fourth transmission component (34) mesh with each other. The closer they are to the center of the second pitch shaft (31), the larger the angle between the axial direction of the second pitch groove and the axial direction of the second pitch shaft (31).

6. An adjustable-pitch pipette according to claim 1, characterized in that, The liquid-drawing movable seat (24) is C-shaped and partially surrounds the first variable pitch shaft (25). The four corners of the lifting seat (21) are respectively movably sleeved on the outer wall of the longitudinal limiting shaft (212). The second transmission component (27) is located between the connection positions of the two lifting seats (21) on the same side and the longitudinal limiting shaft (212).

7. An adjustable-pitch pipette according to claim 1, characterized in that, The system includes a cavity frame assembly (1), the liquid pumping pitch assembly (2) and the channel pitch assembly (3) are disposed within the cavity frame assembly (1), and the channel seat (321) is limited to lateral movement within the cavity frame assembly (1).

8. An adjustable-pitch pipette according to claim 7, characterized in that, The channel seat (321) is provided with a channel limiting shaft (325), which is arranged laterally. The channel limiting shaft (325) is fixedly connected to the cavity frame assembly (1). The channel seat (321) is movably sleeved on the channel limiting shaft (325), and the channel seat (321) moves at the upper limit on the channel limiting shaft (325).

9. An adjustable-pitch pipette according to claim 7, characterized in that, The cavity frame assembly (1) is provided with a movable limiting member (11), which is fixedly connected to the cavity frame assembly (1). The movable limiting member (11) is sleeved on the outer wall of the longitudinal limiting shaft (212), and the longitudinal limiting shaft (212) is limited to rotate within the movable limiting member (11).

10. An adjustable-pitch pipette according to claim 1, characterized in that, The liquid pumping variable pitch assembly (2) includes a lifting drive element (22) and a variable pitch drive element (23). The variable pitch drive element (23) drives the longitudinal limiting shaft (212) to rotate. The lifting seat (21) is provided with a lifting nut sleeve (213) and a lifting screw (214). The lifting nut sleeve (213) is fixedly connected to the lifting seat (21). The lifting nut sleeve (213) and the lifting screw (214) are threaded together. The lifting drive element (22) drives the lifting screw (214) to rotate.

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