Height-adjustable damping device for pipette and pipette

Abstract

A height-adjustable damping device for a pipette and a pipette. The height-adjustable damping device for a pipette comprises a sheath (1), an elastic member (2) and a limiting structure (3), and the pipette comprises a sampling rod (100). The sheath (1) is provided with an axial through hole (11); the elastic member (2) is disposed in the axial through hole (11), a first stepped surface is provided on the inner wall of the axial through hole (11), and two ends of the elastic member (2) respectively abut against the first stepped surface and the sampling rod (100); and the limiting structure (3) is disposed on the sampling rod (100), and the limiting structure (3) can abut against the sheath (1) to limit a lower limit position of the sampling rod (100). The device can prevent contact damage between the sampling rod (100) and a detection test paper, reduce the requirement on distance precision of the pipette during the pipetting descending process, thereby reducing the precision design cost and component processing difficulty, and improving the success rate of one-time sampling and pipetting of the sampling rod (100).

Description

Height-adjustable damping device for pipette and pipette TECHNICAL FIELD

[0001] The utility model relates to water quality detection equipment technical field especially relates to a height-adjustable damping device for pipette and pipettle. BACKGROUND

[0002] In water quality detection project, liquid micro sampling can be carried out by dipping, using sampling stick to dip liquid sampling, and then transferring liquid to test paper. When using full-automatic micropipette to sample and then transfer to test paper, the relative distance between sampling stick and test paper needs to be accurately calculated, and the movement speed of micropipette sampling stick to test paper needs to be strictly controlled, so as to prevent micropipette sampling stick from damaging test paper and causing test failure. Therefore, the precision and assembly precision of related structural parts on micropipette are required to be high, and the relative height needs to be adjusted by tooling during assembly, which leads to high processing difficulty of micropipette, complex assembly and debugging, and high cost.

[0003] SUMMARY

[0004] The utility model discloses a height-adjustable damping device for pipette and pipette, which increases the adjustable damping device in the height direction of the sampling stick, reduces the precision design cost and processing difficulty, and further reduces the liquid sampling cost.

[0005] To solve the problem of high processing difficulty of pipette, the first aspect of the present application provides a height-adjustable damping device for pipette, the pipette comprising a sampling stick, and the height-adjustable damping device for pipette comprising:

[0006] A sheath provided with an axial through hole;

[0007] An elastic member arranged in the axial through hole, an inner wall of the axial through hole is provided with a first step surface, and two ends of the elastic member are respectively abutted against the first step surface and the sampling stick;

[0008] A limiting structure arranged on the sampling stick, and the limiting structure can be abutted against the sheath to limit the lower limit position of the sampling stick.

[0009] In some embodiments, the elastic member is a compression spring, the elastic member is arranged on the sampling stick, the sampling stick is provided with a second step surface, and two ends of the elastic member are respectively abutted 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 stick, and under the action of the elastic member, the limiting convex ring can be abutted against the top surface of the sheath to limit the upper limit position of the sampling stick.

[0011] In some embodiments, the height-adjustable damping device for the pipette further comprises a base provided at the top end of the sheath, the base is provided with a limiting groove, the limiting convex ring is slidingly provided in the limiting groove, and the limiting convex ring can be stopped at the groove bottom of the limiting groove to limit the sampling rod when the sampling rod slides along the axial direction of the axial through hole towards the base.

[0012] In some embodiments, the sheath is provided with a plurality of sheaths, each of the plurality of sheaths is 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 and the plurality of limiting grooves are one-to-one correspondingly arranged.

[0013] In some embodiments, the sheath is provided with a plurality of axial through holes, the base is provided with a plurality of limiting grooves, and the plurality of axial through holes and the plurality of limiting grooves are one-to-one correspondingly arranged.

[0014] In some embodiments, the axial through hole is further provided with a linear bearing, and the sampling rod penetrates through the linear bearing.

[0015] In some embodiments, the height-adjustable damping device for the pipette further comprises a limiting plate provided at the bottom end of the sheath and fixedly connected with the sheath, the inner wall of the axial through hole is provided with a third step surface, the top end of the linear bearing is stopped at the third step surface, and the bottom end of the linear bearing is stopped at the limiting plate.

[0016] In some embodiments, the height-adjustable damping device for the pipette further comprises a sealing gasket provided at the bottom end of the sheath and fixedly connected with the sheath, and the sampling rod penetrates through the sealing gasket.

[0017] The second aspect of the present application provides a pipette comprising a sampling rod and the height-adjustable damping device for the pipette provided by any one of the embodiments, and the sampling rod is elastically connected with the height-adjustable damping device for the pipette.

[0018] The height-adjustable damping device for the pipette provided by the present application can reduce the hard contact generated when the sampling rod contacts the test paper by arranging an elastic member between the sheath and the sampling rod and arranging a limiting structure on the sampling rod, thereby avoiding the contact damage between the sampling rod and the test paper. Under the action of the elastic member, the sampling rod can reduce the distance precision requirement of the pipette in the pipetting descent process, thereby facilitating the reduction of the precision design cost and the component processing difficulty, and improving the one-time sampling pipetting success rate of the sampling rod.

[0019] The pipette provided by the application comprises a sampling rod, the sampling rod is elastically mounted (damped mounting) in the height direction through a height-adjustable damping device for the pipette, and therefore the displacement precision design cost and component machining difficulty of the pipette can be reduced, the sampling rod is elastically contacted with the test paper in a certain moving range, damping buffering of the sampling rod is realized, contact damage to the test paper is reduced, and the one-time sampling pipetting success rate of the pipette is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 is a sectional structure schematic view of the damping device when the sampling rod provided by the embodiment of the application is in a lower limit position;

[0021] Fig. 2 is a sectional structure schematic view of the damping device when the sampling rod provided by the embodiment of the application is in an upper limit position;

[0022] Fig. 3 is a structure schematic view of the base in the damping device provided by the embodiment of the application.

[0023] DESCRIPTION OF DRAWINGS

[0024] Wherein, 100-sampling rod; 1-sheath; 11-axial through hole; 2-elastic member; 3-limiting structure; 4-base; 41-limiting groove; 42-first connecting hole; 43-second connecting hole; 5-linear bearing; 6-limiting plate; 7-sealing gasket. DETAILED DESCRIPTION

[0025] The utility model will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0026] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; It can be mechanical connection, or electrical connection; It can be directly connected, or indirectly connected through intermediate medium, it can be the communication inside two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0027] Part of the embodiments of the application provide a height-adjustable damping device for a pipette, as shown in FIGS. 1-3, the pipette comprising a sampling rod 100. The height-adjustable damping device for the pipette comprises a sheath 1, an elastic member 2 and a limiting structure 3, the sheath 1 being provided with an axial through hole 11; as shown in FIG. 1, 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, and the two ends of the elastic member 2 are respectively abutted against the first step surface and the sampling rod 100; the limiting structure 3 is arranged on the sampling rod 100, and 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.

[0028] The height-adjustable damping device for the pipette provided by the application is used to realize the height-adjustable damping connection and installation of the sampling rod 100. In the embodiment, the elastic member 2 is arranged between the sheath 1 and the sampling rod 100, and the limiting structure 3 is arranged on the sampling rod 100, so that 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 shown in FIG. 1, the limiting structure 3 on the sampling rod 100 abuts against the top surface of the sheath 1, so that the sampling rod 100 is installed in the height direction with adjustable damping. After the sampling end of the sampling rod 100 is subjected to an external force, it can be contracted and buffered, thereby reducing the hard contact generated when the sampling rod 100 contacts the test paper, and avoiding the contact damage between the sampling rod 100 and the test paper. Under the action of the elastic member 2, the sampling rod 100 can reduce the distance precision requirement of the pipette in the pipetting descent process. When the sampling rod 100 descends beyond the distance, due to the buffering action of the elastic member 2, the test paper below will not be damaged, thereby reducing the precision design cost and the component processing difficulty, and improving the one-time sampling pipetting success rate of the sampling rod 100.

[0029] In some embodiments, the elastic member 2 is a compression spring, the elastic member 2 is sleeved on the sampling rod 100, the sampling rod 100 is provided with a second step surface, and the two ends of the elastic member 2 are respectively abutted against the first step surface and the second step surface.

[0030] As shown in FIGS. 1 and 2, the outer wall of the sampling rod 100 is provided with a second step surface, 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, and the axial through hole 11 is a stepped surface, wherein the hole diameter of the first hole diameter section towards the top end is smaller than the hole diameter of the second hole diameter section adjacent to it, the first hole diameter section and the second hole diameter section form a first step surface, the sampling rod 100 penetrates through the axial through hole 11, the top end of the sampling rod 100 protrudes out of the axial through hole 11, the top end of the sampling rod 100 is provided with the limiting structure 3, and the outer diameter of the limiting structure 3 is greater than the hole diameter of the first hole diameter section so as to abut against the top surface of the sheath 1 for limiting.

[0031] In some embodiments, the limiting structure 3 is a limiting convex ring arranged at the top end of the sampling rod 100, which can abut against the top surface of the sheath 1 to limit under the action of the elastic member 2.

[0032] In the embodiment, as shown in FIG. 1, the sampling rod 100 is arranged through the axial through hole 11, and the limiting structure 3 arranged at the top end of the sampling rod 100 is a limiting convex ring. Specifically, taking a nut threadedly connected at the top end of the sampling rod 100 as an example, the outer diameter of the nut is greater than the hole diameter (i.e. the hole diameter of the first hole diameter section) of the axial through hole 11 at the top surface of the sheath 1, so that 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 retractable elastic buffering performance under the action of the elastic member 2, and 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 butterfly nuts with irregular shapes having an outer diameter greater than the hole diameter of the first hole diameter section, which can meet the limiting effect on the lower limit position of the sampling rod 100 and do not affect the upward sliding buffering of the sampling rod 100.

[0033] In some embodiments, the height-adjustable damping device for the pipette further comprises a base 4 arranged at the top end of the sheath 1, and the base 4 is provided with a limiting groove 41, and the limiting convex ring is slidingly arranged in the limiting groove 41. When the sampling rod 100 slides along the axial direction of the axial through hole 11 towards the base 4, the limiting convex ring can abut against the groove bottom of the limiting groove 41 to limit.

[0034] As shown in FIG. 1, the base 4 is detachably mounted with the sheath 1, and the limiting groove 41 is coaxial with the axial through hole 11, so that the top end of the sampling rod 100 can be sequentially arranged through the axial through hole 11 and the limiting groove 41. Meanwhile, the hole diameter 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 is upwardly slid (in the direction from the sheath 1 to the base 4) under the external force, the limiting convex ring is driven to slide along the limiting groove 41. When the limiting convex ring abuts against the groove bottom (also the hole bottom of the blind hole) of the limiting groove 41, the sampling rod 100 stops upward sliding, thereby limiting the upper limit position of the sampling rod 100. As shown in FIG. 2, at this time, the elastic member 2 is in the state of the maximum compression amount, and after the external force on the sampling rod 100 is eliminated, the sampling rod 100 returns to the lower limit position shown in FIG. 1 under the action of the elastic member 2.

[0035] In some embodiments, the sheath 1 is provided in plurality, and the plurality of sheaths 1 are respectively connected to the base 4. The base 4 is provided with a plurality of limiting grooves 41, and the plurality of axial through holes 11 of the plurality of sheaths 1 are arranged one by one with the plurality of limiting grooves 41.

[0036] As shown in FIG. 1 and FIG. 2, when the sheath 1 is provided in plurality, the plurality of sheaths 1 are respectively detachably mounted on the base 4, which is conducive to selectively mounting a plurality of sampling rods 100 on one base 4 to achieve multi-sample sampling. It needs to be explained that the base 4 is used to connect the driving mechanism to facilitate automatic sampling (liquid taking) and pipetting. As shown in FIG. 3, one end of the base 4 is provided with a first connecting hole 42 for connecting the driving mechanism, and the bottom surface of the base 4 is provided with a limiting groove 41, which is a blind hole, and the limiting groove 41 is arranged corresponding to the axial through hole 11. The base 4 is provided with a second connecting hole 43 for connecting the sheath 1, and the second connecting hole 43 is arranged at both ends of the plurality of limiting grooves 41. In order to facilitate connection, the second connecting hole 43 is arranged in a counterbore, and the connecting piece can be screwed to the sheath 1 after being arranged from top to bottom through the second connecting hole 43, thereby achieving detachable mounting of the sheath 1. The connecting piece can be a long rod bolt.

[0037] In some embodiments, the sheath 1 is provided with a plurality of axial through holes 11, and the base 4 is provided with a plurality of limiting grooves 41, and the plurality of axial through holes 11 and the plurality of limiting grooves 41 are arranged one by one.

[0038] In this embodiment, the plurality of sheaths 1 are arranged as an integrated sheath 1, that is, the integrated sheath 1 is provided with a plurality of axial through holes 11 to achieve selective mounting of the sampling rod 100, and each axial through hole 11 is used to elastically mount one sampling rod 100. When multi-sample sampling is required, the integrated sheath 1 is more convenient and fast to install. Correspondingly, the base 4 is provided with a plurality of limiting grooves 41 corresponding to the plurality of limiting grooves 41, and the plurality of axial through holes 11 and the plurality of limiting grooves 41 are 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.

[0039] In some embodiments, the axial through hole 11 is further provided with a linear bearing 5, and the sampling rod 100 penetrates through the linear bearing 5.

[0040] As shown in FIG. 1 and FIG. 2, 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 with 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, and is more conducive to the sliding buffer motion and rapid recovery motion of the sampling rod 100, and the linear bearing 5 can reduce the shaking of the sampling rod 100 during the motion, thereby improving the accuracy of pipetting.

[0041] In some embodiments, the height-adjustable damping device for the pipette further comprises a limiting plate 6, which is arranged at the bottom end of the sheath 1 and is fixedly connected with the sheath 1. The inner wall of the axial through hole 11 is provided with a third stepped surface, the top end of the linear bearing 5 abuts against the third stepped surface, and the bottom end of the linear bearing 5 abuts against the limiting plate 6.

[0042] As shown in FIG. 1 and FIG. 2, the third aperture section is formed at the bottom end of the second aperture section in the axial through hole 11, the aperture of the third aperture section is larger than the aperture of the second aperture section, a third step surface is formed between the second aperture section and the third aperture section, the linear bearing 5 is installed on the third aperture section, the top end of the linear bearing 5 is abutted on the third step surface for installation and positioning, and the bottom end of the linear bearing 5 is abutted on the limiting plate 6 for installation and fixation. The limiting plate 6 is detachably connected with the sheath 1, such as bolt connection. When a plurality of axial through holes 11 are arranged on the sheath 1, a plurality of first through holes for installing the sampling rod 100 are arranged on the limiting plate 6.

[0043] In some embodiments, the height-adjustable damping device for the pipette further comprises a sealing pad 7, the sealing pad 7 is arranged at the bottom end of the sheath 1 and fixedly connected with the sheath 1, and the sampling rod 100 is arranged through the sealing pad 7.

[0044] As shown in FIG. 1, the sealing pad 7 is arranged on the limiting plate 6, the sealing pad 7 can be pasted on the limiting plate 6 by the self-provided adhesive, and when the sampling rod 100 is deeply inserted into the sample box for sampling, the sealing pad 7 can preferentially seal the sampling port of the sample box in the sampling process to prevent the water in the sample box from splashing. The sealing pad 7 is provided with a second through hole for conveniently installing the sampling rod 100, when the second through hole is arranged in one-to-one correspondence with the axial through hole 11, the sealing pad 7 can slideably seal the sampling rod 100 to prevent water from entering the axial through hole 11, and the waterproof protection of the sheath 1 is realized. Preferably, the sealing pad 7 is made of elastic rubber material.

[0045] Part of the embodiments of the present application further provide a pipette, comprising the sampling rod 100 and the height-adjustable damping device for the pipette provided by any of the above embodiments, and the sampling rod 100 is elastically connected with the height-adjustable damping device for the pipette.

[0046] The pipette provided by the present application realizes the elastic installation (damping installation) of the sampling rod 100 in the height direction through the height-adjustable damping device for the pipette, thereby reducing the displacement precision design cost and component processing difficulty of the pipette, the sampling rod 100 elastically contacts the test paper in a certain moving range, realizes the damping buffering of the sampling rod 100, reduces the contact damage to the test paper, and improves the one-time sampling and pipetting success rate of the pipette.

[0047] The above embodiments of the present application are only examples for clearly illustrating the present application, and are not a limitation on the embodiments of the present application. For ordinary skilled persons in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the present application. It is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A height-adjustable damping device for a pipette, the pipette comprising a sampling stick (100), characterized in that, The height-adjustable damping device for the pipette includes: Sheath (1), wherein the sheath (1) is provided with an axial through hole (11); Elastic element (2), the elastic element (2) is disposed in the axial through hole (11), the inner wall of the axial through hole (11) is provided with a first stepped surface, and the two ends of the elastic element (2) respectively abut against the first stepped surface and the sampling rod (100); A limiting structure (3) is provided on the sampling rod (100), and the limiting structure (3) can stop against the sheath (1) to limit 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 element (2) is a compression spring. The elastic element (2) is sleeved on the sampling rod (100). The sampling rod (100) has a second step surface. The two ends of the elastic element (2) abut against the first step surface and the second step surface, respectively.

3. The height adjustable damping device for a pipette according to claim 2, characterized in that The limiting structure (3) is a limiting protrusion ring provided at the top of the sampling rod (100). Under the action of the elastic member (2), the limiting protrusion ring can stop against the top surface of the sheath (1) to limit the position.

4. The height adjustable damping device for a pipette according to claim 3, characterized in that It also includes a base (4), which is located at the top of the sheath (1). The base (4) is provided with a limiting groove (41). The limiting protrusion is slidably disposed in the limiting groove (41). When the sampling rod (100) slides toward the base (4) along the axial direction of the axial through hole (11), the limiting protrusion can stop against the bottom of the limiting groove (41) to limit 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 The sheath (1) is provided in multiple ways, and 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 respectively provided with the multiple limiting grooves (41).

6. The height adjustable damping device for a pipette according to claim 4, characterized in that The sheath (1) is provided with a plurality of axial through holes (11), and the base (4) is provided with a plurality of limiting grooves (41). The plurality of axial through holes (11) and the plurality of limiting grooves (41) are provided in a one-to-one correspondence.

7. The height adjustable damping device for a pipette according to claim 1, characterized in that A linear bearing (5) is also provided inside the axial through hole (11), and the sampling rod (100) is arranged through the linear bearing (5).

8. The height adjustable damping device for a pipette according to claim 7, characterized in that It also includes a limiting plate (6), which is located at the bottom end of the sheath (1) and 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).

9. The height adjustable damping device for a pipette according to claim 8, characterized in that It also includes a sealing gasket (7), which is located at the bottom end of the sheath (1) and fixedly connected to the sheath (1), and the sampling rod (100) is disposed through the sealing gasket (7).

10. A pipette, characterized in that The device includes a sampling rod (100) and a height-adjustable damping device for a pipette according to any one of claims 1-9, wherein the sampling rod (100) is elastically connected to the height-adjustable damping device for a pipette.

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