Height-adjustable damping device for pipettor and pipettor
By adding an adjustable damping device to the sampling rod, the damage to the accuracy and test strips of the micro pipette during the sampling process is solved, achieving a higher sampling success rate and reducing cost.
Patent Information
- Application Number
- CN202422366170.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-09-27
AI Technical Summary
When transferring to the test strip after sampling, existing micro pipettes need to accurately control the relative distance and speed between the sampling stick and the test strip, resulting in high processing difficulty, high cost and complex assembly.
The adjustable damping device is added to the height direction of the sampling rod. Through the combination of sheath, elastic members and limit structure, the height adjustable and buffering movement of the sampling rod is achieved, reducing the risk of hard contact to the test strips.
It reduces the accuracy design and processing difficulty of the pipette, improves the sampling success rate, avoids contact damage between the sampling stick and the test strip, and reduces costs.
Smart Images
Figure CN223128084U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of water quality detection equipment, in particular to a height-adjustable damping device for a pipette and a pipette. Background Art
[0002] In water quality detection projects, micro-sampling of liquids is generally carried out by dipping. A sampling rod is used to dip the liquid for sampling, and then the liquid is transferred to a test paper. When a current fully automatic micropipette transfers the sampled liquid to the test paper after sampling, the relative distance between the sampling rod and the test paper needs to be accurately calculated, and the movement speed of the sampling rod of the micropipette to the test paper needs to be strictly controlled to prevent the sampling rod of the micropipette from damaging the test paper and resulting in a failed test result. Therefore, the precision requirements for the relevant structural parts on the micropipette and the assembly precision are very high, and a tooling is also required to adjust the relative height during assembly, resulting in high processing difficulty, complex assembly and debugging, and high cost of the micropipette. Summary of the Utility Model
[0003] The purpose of the utility model is to provide a height-adjustable damping device for a pipette and a pipette. By adding an adjustable damping device in the height direction of the sampling rod, the cost of precision design and processing difficulty are reduced, and thus the cost of liquid sampling and pipetting is reduced.
[0004] To achieve this purpose, the utility model adopts the following technical solutions:
[0005] A height-adjustable damping device for a pipette, the pipette includes a sampling rod; the height-adjustable damping device for a pipette includes:
[0006] A sheath, the sheath is provided with an axial through hole;
[0007] An elastic member, the elastic member is arranged in the axial through hole, a first step surface is arranged on the inner wall of the axial through hole, and both ends of the elastic member respectively abut against the first step surface and the sampling rod;
[0008] A limiting structure, the limiting structure is arranged on the sampling rod, and the limiting structure can abut against the sheath to define the lower limit position of the sampling rod.
[0009] In some embodiments, the elastic member is a compression spring, the compression spring is sleeved on the sampling rod, a second step surface is arranged on the sampling rod, and both ends of the elastic member respectively abut against the first step surface and the second step surface.
[0010] In some embodiments, the limiting structure is a limiting convex ring arranged at the top end of the sampling rod. Under the action of the elastic member, the limiting convex ring can abut against the top surface of the sheath to define the upper limit position of the sampling rod.
[0011] In some embodiments, the height-adjustable damping device for the pipette further includes a base, the base is disposed at the top end of the sheath, a limiting groove is provided on the base, the limiting convex ring is slidably disposed in the limiting groove, and when the sampling rod slides towards the base along the axis of the axial through hole, the limiting convex ring can abut against the bottom of the limiting groove for limiting.
[0012] In some embodiments, there are a plurality of the sheaths, the plurality of sheaths are respectively connected to the base, the base is provided with a plurality of limiting grooves, and the plurality of axial through holes of the plurality of sheaths are arranged in one-to-one correspondence with the plurality of limiting grooves.
[0013] In some embodiments, the sheath is provided with a plurality of the axial through holes, the base is provided with a plurality of limiting grooves, and the plurality of axial through holes are arranged in one-to-one correspondence with the plurality of limiting grooves.
[0014] In some embodiments, a linear bearing is further disposed in the axial through hole, and the sampling rod passes through the linear bearing.
[0015] In some embodiments, the height-adjustable damping device for the pipette further includes a limiting plate, the limiting plate is disposed at the bottom end of the sheath and fixedly connected to the sheath, a third step surface is provided on the inner wall of the axial through hole, the top end of the linear bearing abuts against the third step surface, and the bottom end of the linear bearing abuts against the limiting plate.
[0016] In some embodiments, the height-adjustable damping device for the pipette further includes a sealing gasket, the sealing gasket is disposed at the bottom end of the sheath and fixedly connected to the sheath, and the sampling rod passes through the sealing gasket.
[0017] The present utility model further provides a pipette, which includes a sampling rod and the height-adjustable damping device for the pipette provided in any one of the above embodiments, and the sampling rod is elastically connected to the height-adjustable damping device for the pipette.
[0018] Advantages of the present utility model:
[0019] The height-adjustable damping device for the pipette provided by the present utility model, by arranging an elastic member between the sheath and the sampling rod and arranging a limiting structure on the sampling rod, enables the sampling rod to have a movement buffer in the height direction. The elastic member can reduce the hard contact generated when the sampling rod contacts the test strip, avoiding the contact damage between the sampling rod and the test strip; under the action of the elastic member, the sampling rod can reduce the requirement for the distance accuracy during the liquid transfer descent process of the pipette, thereby facilitating the reduction of the precision design cost and the component processing difficulty, and improving the success rate of the first sampling and liquid transfer of the sampling rod.
[0020] The pipette provided by the present utility model includes a sampling rod. The sampling rod is elastically mounted (damped mounted) in the height direction through a height-adjustable damping device for the pipette, thereby being able to reduce the design cost of the displacement accuracy of the pipette and the processing difficulty of components. The sampling rod is elastically in contact with the test strip within a certain moving range, achieving the damping buffer of the sampling rod, reducing the contact damage to the test strip, and improving the success rate of the first sampling and liquid transfer of the pipette. Description of the Drawings
[0021] Figure 1 is a schematic cross-sectional structure of the height-adjustable damping device for the pipette provided by an embodiment of the present utility model Figure 1 (The sampling rod is in the lower limit position);
[0022] Figure 2 is a schematic cross-sectional structure of the height-adjustable damping device for the pipette provided by an embodiment of the present utility model Figure 2 (The sampling rod is in the upper limit position);
[0023] Figure 3 is a schematic structural diagram (perspective view) of the base in the height-adjustable damping device for the pipette provided by an embodiment of the present utility model.
[0024] In the figure:
[0025] 100. Sampling rod;
[0026] 1. Sheath; 11. Axial through hole; 2. Elastic member; 3. Limiting structure; 4. Base; 41. Limiting groove; 42. First connection hole; 43. Second connection hole; 5. Linear bearing; 6. Limiting plate; 7. Sealing gasket. Detailed Embodiment
[0027] The present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.
[0028] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0029] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.
[0030] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right" and the like are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operations, 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 to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.
[0031] This embodiment provides a height-adjustable damping device for a pipette, as Figures 1-3 , the pipette includes a sampling rod 100. The height-adjustable damping device for the sampling rod 100 of the pipette includes a sheath 1, an elastic member 2 and a limiting structure 3. The sheath 1 is provided with an axial through hole 11; as Figure 1 shown, the axis of the axial through hole 11 is arranged along the height direction. The elastic member 2 is arranged in the axial through hole 11. The inner wall of the axial through hole 11 is provided with a first step surface. The two ends of the elastic member 2 respectively abut against the first step surface and the sampling rod 100; the limiting structure 3 is arranged on the sampling rod 100. Under the action of the elastic member 2, the limiting structure 3 can abut against the sheath 1 to limit the lower limit position of the sampling rod 100.
[0032] The height-adjustable damping device for the pipette provided by the present utility model is used to realize the height-adjustable damping connection and installation of the sampling rod 100. In this embodiment, by arranging the elastic member 2 between the sheath 1 and the sampling rod 100 and arranging the limiting structure 3 on the sampling rod 100, the sampling rod 100 has a movement buffer in the height direction. In the initial state, the sampling rod 100 is in the lower limit position under the action of the elastic member 2, as Figure 1As shown, the limiting structure 3 on the sampling rod 100 abuts against the top surface of the sheath 1, realizing adjustable damping installation of the sampling rod 100 in the height direction. When an external force is applied to the sampling end of the sampling rod 100, it can contract and buffer, thereby reducing the hard contact generated when the sampling rod 100 contacts the test strip and avoiding contact damage between the sampling rod 100 and the test strip. Under the action of the elastic member 2, the sampling rod 100 can reduce the requirement for the distance accuracy during the downward pipetting process of the pipette. When the sampling rod 100 descends beyond the distance, due to the buffering effect of the elastic member 2, it will not cause damage to the test strip below, which is conducive to reducing the precision design cost and the component processing difficulty, and can improve the success rate of the first sampling and pipetting of the sampling rod 100.
[0033] In some embodiments, the elastic member 2 is a compression spring. The elastic member 2 is sleeved on the sampling rod 100. A second step surface is provided on the sampling rod 100, and both ends of the elastic member 2 respectively abut against the first step surface and the second step surface.
[0034] As Figure 1 and Figure 2 As shown, a second step surface is provided on the outer wall of the sampling rod 100. The outer diameter of the part above the second step surface is smaller than the outer diameter of the part below the second step surface. The elastic member 2 is sleeved on the part above the second step surface. The axial through hole 11 is a step surface. Among them, the aperture of the first aperture section facing the top end is smaller than the aperture of the second aperture section adjacent to it. A first step surface is formed between the first aperture section and the second aperture section. The sampling rod 100 passes through the axial through hole 11. The top end of the sampling rod 100 protrudes from the axial through hole 11. A limiting structure 3 is provided at the top end of the sampling rod 100. The outer diameter of the limiting structure 3 is larger than the aperture of the first aperture section so as to abut against the top surface of the sheath 1 for limiting.
[0035] In some embodiments, the limiting structure 3 is a limiting convex ring provided at the top end of the sampling rod 100. Under the action of the elastic member 2, the limiting convex ring can abut against the top surface of the sheath 1 for limiting.
[0036] In this embodiment, as Figure 1, the sampling rod 100 is arranged through the axial through hole 11. The limiting structure 3 arranged at the top end of the sampling rod 100 is a limiting convex ring. Specifically, taking the example of screwing a nut at the top end of the sampling rod 100, the outer diameter of the nut is greater than the aperture of the axial through hole 11 on the top surface of the sheath 1 (i.e., the aperture of the first aperture section). Thus, the limiting convex ring can abut against the top surface of the sheath 1 to limit the lower limit position of the sampling rod 100, and the sampling rod 100 has a contractible elastic buffering performance under the action of the elastic member 2. The limiting convex ring does not affect the upward sliding buffering of the sampling rod 100. Of course, in other embodiments, the limiting structure 3 can also be other pins or wing nuts with an outer diameter greater than the aperture of the first aperture section and other irregular shapes, as long as it can limit the lower limit position of the sampling rod 100 and does not affect the upward sliding buffering of the sampling rod 100.
[0037] In some embodiments, the height-adjustable damping device for the pipette further includes a base 4. The base 4 is arranged at the top end of the sheath 1. A limiting groove 41 is arranged on the base 4. The limiting convex ring is slidably arranged in the limiting groove 41. When the sampling rod 100 slides towards the base 4 along the axis direction of the axial through hole 11, the limiting convex ring can abut against the bottom of the limiting groove 41 for limiting.
[0038] As Figure 1 shown, the base 4 and the sheath 1 are detachably installed. The limiting groove 41 is coaxial with the axial through hole 11, so that the top end of the sampling rod 100 can sequentially pass through the axial through hole 11 and the limiting groove 41. At the same time, the aperture of the limiting groove 41 matches the outer diameter of the limiting convex ring, so that the limiting convex ring can slide in the limiting groove 41. The limiting groove 41 is a blind hole structure. When the sampling rod 100 slides upward under an external force (in the direction from the sheath 1 to the base 4), it drives the limiting convex ring to slide along the limiting groove 41. When the limiting convex ring abuts against the bottom of the limiting groove 41 (which is also the bottom of the blind hole), the sampling rod 100 stops sliding upward, realizing the limit of the upper limit position of the sampling rod 100. As Figure 2 shown in the state, at this time, the elastic member 2 is in the state with the maximum compression amount. After the external force on the sampling rod 100 is removed, the sampling rod 100 returns to the Figure 1 shown lower limit position under the action of the elastic member 2.
[0039] In some embodiments, there are multiple sheaths 1. The multiple sheaths 1 are respectively connected to the base 4. The base 4 is provided with multiple limiting grooves 41. The multiple axial through holes 11 of the multiple sheaths 1 are arranged in one-to-one correspondence with the multiple limiting grooves 41.
[0040] As Figure 1 and Figure 2, when there are multiple sheaths 1, the multiple sheaths 1 are respectively detachably mounted on the base 4, which is conducive to selectively mounting multiple sampling rods 100 on one base 4 to achieve multi-sample sampling. It should be noted that the base 4 is used to connect the driving mechanism to facilitate automatic sampling (liquid extraction) and pipetting. As Figure 3 shown, one end of the base 4 is provided with a first connection hole 42 for connecting the driving mechanism, and a limiting groove 41 is formed on the bottom surface of the base 4. The limiting groove 41 is a blind hole and is correspondingly arranged with the axial through hole 11. The base 4 is provided with a second connection hole 43 for connecting the sheath 1. The second connection hole 43 is arranged at both ends of the multiple limiting grooves 41. For the convenience of connection, the second connection hole 43 is a counterbore. The connecting piece can pass through the second connection hole 43 from top to bottom and then be threadedly connected to the sheath 1 to achieve the detachable installation of the sheath 1. The connecting piece can be a long bolt.
[0041] In some embodiments, the sheath 1 is provided with multiple axial through holes 11, and the base 4 is provided with multiple limiting grooves 41. The multiple axial through holes 11 and the multiple limiting grooves 41 are correspondingly arranged one by one.
[0042] In this embodiment, the multiple sheaths 1 are arranged as an integral structure of the sheath 1, that is, the selective installation of the sampling rod 100 is realized by arranging multiple axial through holes 11 on the integral structure of the sheath 1. Each axial through hole 11 is respectively used for elastically installing a sampling rod 100. When multi-sample sampling is required, the installation of the integral structure of the sheath 1 is more convenient and fast. Correspondingly, multiple limiting grooves 41 are correspondingly arranged on the base 4, and the multiple axial through holes 11 and the multiple limiting grooves 41 are correspondingly arranged one by one. The limiting groove 41 has a limiting effect on the sliding direction of the sampling rod 100 and a guiding effect on the sliding direction.
[0043] In some embodiments, a linear bearing 5 is further arranged in the axial through hole 11, and the sampling rod 100 is arranged through the linear bearing 5.
[0044] As Figure 1 and Figure 2 shown, the fixed part of the linear bearing 5 is limited or fixed in the axial through hole 11, and the movable part of the linear bearing 5 is connected to the sampling rod 100. When the sampling rod 100 slides in the axial through hole 11, the linear bearing 5 is conducive to reducing the sliding friction resistance of the sampling rod 100, more conducive to the sliding buffering movement and rapid recovery movement of the sampling rod 100, and the linear bearing 5 can reduce the shaking of the sampling rod 100 during the movement, thereby improving the accuracy of pipetting.
[0045] In some embodiments, the height-adjustable damping device for the pipette further includes a limiting plate 6. The limiting plate 6 is arranged at the bottom end of the sheath 1 and is fixedly connected to the sheath 1. The inner wall of the axial through hole 11 is provided with a third step surface. The top end of the linear bearing 5 abuts against the third step surface, and the bottom end of the linear bearing 5 abuts against the limiting plate 6.
[0046] As Figure 1 and Figure 2 shown, in the axial through hole 11, the bottom end of the second aperture section is the third aperture section, the aperture of the third aperture section is larger than that of the second aperture section, a third stepped surface is formed between the second aperture section and the third aperture section, the linear bearing 5 is installed in the third aperture section, the top end of the linear bearing 5 abuts against the third stepped surface for installation and limitation, and the bottom end of the linear bearing 5 abuts against the limiting plate 6 to achieve installation and fixation. The limiting plate 6 is detachably connected to the sheath 1, such as by bolt connection. When there are multiple axial through holes 11 on the sheath 1, the limiting plate 6 is provided with a plurality of first through holes for installing the sampling rod 100.
[0047] In some embodiments, the height-adjustable damping device for the pipette further includes a gasket 7, the gasket 7 is arranged at the bottom end of the sheath 1 and fixedly connected to the sheath 1, and the sampling rod 100 is arranged through the gasket 7.
[0048] As Figure 1 shown, the gasket 7 is arranged on the limiting plate 6, and the gasket 7 can be adhered to the limiting plate 6 by its own adhesive. When the sampling rod 100 penetrates into the sample box for sampling, the gasket 7 can preferentially seal the sampling port of the sample box during the sampling process to prevent the water in the sample box from splashing. The gasket 7 is provided with a second through hole for facilitating the installation of the sampling rod 100. When the second through hole is arranged in one-to-one correspondence with the axial through hole 11, the gasket 7 can perform sliding sealing on the sampling rod 100 to prevent water from entering the axial through hole 11, thereby realizing waterproof protection for the sheath 1. Preferably, the gasket 7 is made of elastic rubber material.
[0049] An embodiment of the present invention also provides a pipette, which includes a sampling rod 100 and the height-adjustable damping device for the pipette provided in any one of the above embodiments, and the sampling rod 100 is elastically connected to the height-adjustable damping device for the pipette.
[0050] For the pipette provided by the present invention, the sampling rod 100 realizes elastic installation (damping installation) in the height direction through the height-adjustable damping device for the pipette, thereby being able to reduce the design cost of the displacement accuracy of the pipette and the processing difficulty of components. The sampling rod 100 elastically contacts the test strip within a certain moving range, realizing the damping buffer of the sampling rod 100, reducing the contact damage to the test strip, and improving the success rate of the first sampling and liquid transfer of the pipette.
[0051] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.
Claims
1. A height-adjustable damping device for a pipette, the pipette including a sampling rod (100), characterized in that, The height-adjustable damping device for a pipette includes: a sheath (1), the sheath (1) being provided with an axial through-hole (11); an elastic member (2), the elastic member (2) being arranged in the axial through-hole (11), the inner wall of the axial through-hole (11) being provided with a first step surface, and both ends of the elastic member (2) respectively abutting against the first step surface and the sampling rod (100); a limiting structure (3), the limiting structure (3) being arranged on the sampling rod (100), and the limiting structure (3) being capable of abutting against the sheath (1) to define the lower limit position of the sampling rod (100).
2. The height-adjustable damping device for a pipette according to claim 1, characterized in that, The elastic member (2) is a compression spring, the elastic member (2) being sleeved on the sampling rod (100), the sampling rod (100) being provided with a second step surface, and both ends of the elastic member (2) respectively abutting against the first step surface and the second step surface.
3. The height-adjustable damping device for a pipette according to claim 2, wherein, The limiting structure (3) is a limiting convex ring arranged at the top end of the sampling rod (100), and under the action of the elastic member (2), the limiting convex ring is capable of abutting against the top surface of the sheath (1) for limiting.
4. The height-adjustable damping device for a pipette according to claim 3, characterized in that, It further includes a base (4), the base (4) being arranged at the top end of the sheath (1), the base (4) being provided with a limiting groove (41), the limiting convex ring being slidably arranged in the limiting groove (41), and when the sampling rod (100) slides towards the base (4) along the axis of the axial through-hole (11), the limiting convex ring is capable of abutting against the bottom of the limiting groove (41) to define the upper limit position of the sampling rod (100).
5. The height-adjustable damping device for a pipette according to claim 4, characterized in that, There are a plurality of the sheaths (1), the plurality of the sheaths (1) being respectively connected to the base (4), the base (4) being provided with a plurality of limiting grooves (41), and the plurality of axial through-holes (11) of the plurality of the sheaths (1) being arranged in one-to-one correspondence with the plurality of the limiting grooves (41).
6. The height-adjustable damping device for a pipette according to claim 4, wherein, The sheath (1) is provided with a plurality of the axial through-holes (11), the base (4) is provided with a plurality of limiting grooves (41), and the plurality of axial through-holes (11) are arranged in one-to-one correspondence with the plurality of limiting grooves (41).
7. The height-adjustable damping device for a pipette according to claim 1, characterized in that, A linear bearing (5) is further arranged in the axial through-hole (11), and the sampling rod (100) passes through the linear bearing (5).
8. The height-adjustable damping device for a pipette according to claim 7, wherein, It further includes a limiting plate (6), the limiting plate (6) being arranged at the bottom end of the sheath (1) and fixedly connected to the sheath (1), the inner wall of the axial through-hole (11) being provided with a third step surface, the top end of the linear bearing (5) abutting against the third step surface, and the bottom end of the linear bearing (5) abutting against the limiting plate (6).
9. The height-adjustable damping device for a pipette according to claim 8, characterized in that, It further includes a sealing gasket (7), the sealing gasket (7) being arranged at the bottom end of the sheath (1) and fixedly connected to the sheath (1), and the sampling rod (100) passes through the sealing gasket (7).
10. Pipette, characterized in that, It includes a sampling rod (100) and the height-adjustable damping device for a pipette according to any one of claims 1-9, and the sampling rod (100) is elastically connected to the height-adjustable damping device for a pipette.