Pipette volume verification platform

Abstract

The utility model relates to pipettor technical field discloses pipettor capacity calibration platform, including the calibration platform and the mainboard of being located above the calibration platform, the front surface of mainboard is provided with a plurality of clamping mechanisms from left to right, the upper surface of calibration platform is provided with a plurality of analytical balance from left to right, the rear surface of mainboard is provided with displacement mechanism, the utility model discloses the cooperation structure of ratchet and ratchet wheel in displacement mechanism, has realized the stepless, convenient adjustment and firm self -locking of mainboard height, so that different specifications pipettor can be quickly, accurately adjusted to the best working height of the distance below the cup when installing, effectively avoided the collision risk, pollution or operation interference that the pipettor suction head accidentally touches the inner wall or liquid level of cup because of too close distance, simultaneously thoroughly eliminated the incomplete emptying of droplet, wall hanging residual or splashing error because of too far distance.

Description

Technical Field

[0001] This utility model relates to the field of pipette technology, specifically a pipette capacity calibration platform. Background Technology

[0002] In experiments, we often need to handle small amounts of liquid. Using a pipette can effectively reduce errors and ensure the accuracy of experimental results. However, if a pipette is not calibrated for a long time, its accuracy will decrease. It needs to be calibrated regularly according to the frequency of use and usage conditions. If calibration is not performed, the error will gradually increase, affecting the accuracy of the experiment.

[0003] The prior art, Chinese Patent Publication No. CN116147737B, provides a pipette calibration device. This device can calibrate pipettes very conveniently, solving the problems of evaporation influence and stringent testing conditions during the calibration process, and reducing the cost of the testing device.

[0004] However, the size of the pipette placement position is relatively fixed, making it inconvenient to change the size to accommodate different sizes of pipettes. As a result, the application range of the pipette calibration device is reduced, and it is impossible to adjust the placement position of the pipette for flexible application.

[0005] Chinese patent discloses a pipette calibration device (authorization announcement number CN221907199U). The patented technology involves placing a container on a base and pressing it against the top of a pressure sensor. A mounting plate is positioned above the container, and an adjusting cylinder is detachably installed in the mounting holes on the surface of the mounting plate. This allows for the removal and replacement of adjusting cylinders with different inner diameters depending on the pipette's diameter. A second protective ring is attached to the inner surface of the adjusting cylinder. Thus, pipettes of different diameters can be mounted on top of the container via the adjusting cylinder for calibration, making pipette placement flexible, convenient, and applicable to a wide range of applications.

[0006] However, it has certain drawbacks: because the pipette fixing structure (such as the mounting plate) is directly fixed to the base with rigid support columns, its installation height is limited and cannot be adapted to the length differences of different pipette sizes or the changes in the placement of containers; when the pipette is too long, its tip may extend too far into the container, posing a risk of collision with the inner wall of the container or the liquid surface, resulting in operational interference, liquid contamination, or even equipment damage; conversely, if the pipette is too short, the distance between the tip and the liquid surface of the container is too large, which may easily produce droplet residue, wall adhesion, or splashing during liquid discharge, seriously affecting the integrity of liquid transfer and the accuracy of weighing. Utility Model Content

[0007] The purpose of this invention is to provide a pipette capacity calibration platform to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A pipette volume calibration platform includes a calibration stage and a main board located above the calibration stage. The front surface of the main board is provided with multiple clamping mechanisms from left to right. The upper surface of the calibration stage is provided with multiple analytical balances from left to right. A beaker is placed on the upper surface of the analytical balance.

[0010] Support blocks are fixedly attached to both the left and right surfaces of the motherboard. A support rod is movably connected through the interior of each support block. A displacement mechanism is provided on the rear surface of the motherboard. The displacement mechanism includes an adjustment frame. A rack is slidably connected to the inner rear surface of the adjustment frame. A rotating rod is rotatably connected through the left side surface of the adjustment frame. A gear is fixedly sleeved on the outside of the rotating rod inside the adjustment frame. A ratchet is fixedly sleeved on the outside of the rotating rod on the left side of the adjustment frame. An adjustment component is provided on the left side surface of the adjustment frame behind the rotating rod.

[0011] As a further embodiment of this utility model: the clamping mechanism includes a clamping frame, and clamping plates are installed on both the front and rear sides of the clamping frame. Multiple springs are fixedly connected to the rear surface of the rear clamping plate, and a screw is rotatably connected to the front surface of the front clamping plate. Slide rods are fixedly connected to both the left and right sides of the screw on the front surface of the front clamping plate.

[0012] As a further embodiment of this utility model: the adjusting component includes a second spring, a positioning block is fixedly connected to the rear end of the second spring, and a pawl is fixedly connected to the front end of the second spring, with a positioning rod rotatably connected to the upper end of the pawl.

[0013] As a further embodiment of this utility model: the number of clamping mechanisms is the same as that of the analytical balance, and the clamping mechanisms are located directly above the analytical balance. The lower end of the support rod is fixed to the upper surface of the calibration table, the front end of the adjustment frame is fixed to the rear surface of the main board, the lower end of the rack is fixed to the upper surface of the calibration table, and the rack is meshed with a gear.

[0014] As a further embodiment of this utility model: the rear end of the clamping frame is fixedly connected to the front surface of the motherboard, the rear end of the spring is fixedly connected to the inner rear surface of the clamping frame, the screw is threadedly connected to the front surface of the clamping frame, and the slide rod is movably connected to the front surface of the clamping frame.

[0015] As a further improvement of this utility model: the pawl is movably engaged with the ratchet, and the right ends of the positioning block and the positioning rod are both fixed to the left side surface of the adjustment frame.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This invention achieves stepless, convenient adjustment and stable self-locking of the mainboard height through the cooperation structure of the pawl and ratchet in the displacement mechanism. This allows for quick and accurate adjustment of the pipette tip to the optimal working height from the beaker below when installing pipettes of different specifications (especially those with significant length differences). This effectively avoids the risk of collision, contamination, or operational interference caused by the pipette tip accidentally touching the inner wall or liquid surface of the beaker due to excessive distance. At the same time, it completely eliminates errors such as incomplete emptying of droplets, residue on the wall, or splashing caused by excessive distance. It significantly improves the accuracy and reliability of volumetric calibration results from two key dimensions: operational safety and integrity of liquid transfer. Attached Figure Description

[0018] Figure 1 A schematic diagram of the pipette capacity calibration platform;

[0019] Figure 2 This is a schematic diagram of the clamping mechanism in the pipette capacity calibration platform.

[0020] Figure 3 A schematic diagram of the displacement mechanism in a pipette capacity calibration platform;

[0021] Figure 4 This is a schematic diagram of the adjusting components in a pipette capacity calibration platform.

[0022] In the diagram: 1. Calibration table; 2. Main board; 3. Clamping mechanism; 4. Clamping frame; 5. Clamping plate; 6. Spring 1; 7. Screw; 8. Slide rod; 9. Analytical balance; 10. Beaker; 11. Support block; 12. Support rod; 13. Displacement mechanism; 14. Adjustment frame; 15. Rack; 16. Rotating rod; 17. Gear; 18. Ratchet; 19. Adjusting component; 20. Spring 2; 21. Positioning block; 22. Pawl; 23. Positioning rod. Detailed Implementation

[0023] Please see Figure 1 and Figure 2In this embodiment of the utility model, the pipette capacity calibration platform includes a calibration table 1 and a main board 2 located above the calibration table 1. The front surface of the main board 2 is provided with multiple clamping mechanisms 3 from left to right. Each clamping mechanism 3 includes a clamping frame 4. The rear end of the clamping frame 4 is fixed to the front surface of the main board 2. Clamping plates 5 are installed on both the front and rear sides inside the clamping frame 4. Multiple springs 6 are fixed to the rear surface of the rear clamping plate 5. The rear end of the springs 6 is fixed to the rear surface inside the clamping frame 4. A screw 7 is rotatably connected to the front surface of the front clamping plate 5. The screw 7 is threaded through and connected to the front surface of the clamping frame 4. Slide rods 8 are fixed to both the left and right sides of the screw 7 on the front surface of the front clamping plate 5. The slide rods 8 move through the front surface of the clamping frame 4. Multiple analytical balances 9 are provided on the upper surface of the calibration table 1 from left to right. The number of clamping mechanisms 3 and analytical balances 9 is the same, and the clamping mechanisms 3 are located directly above the analytical balances 9. A beaker 10 is placed on the upper surface of the analytical balances 9.

[0024] The upper surface of the clamping frame 4 has a clamping hole that extends through to the lower surface, and the two clamping plates 5 and the spring 6 are all located in the clamping hole;

[0025] Rotating the screw 7 can move the front clamping plate 5 towards the rear clamping plate 5, which is used to clamp and fix the pipette placed in the clamping hole.

[0026] The screw 7 is rotatably connected to the front clamping plate 5 via a bearing.

[0027] The slide bar 8 restricts the front clamping plate 5 to move only horizontally, preventing it from tilting;

[0028] A custom tool can be used to press down the pressing ends of multiple pipettes simultaneously. The custom tool can be a plate with slots on the bottom surface that fit the top of the pipettes. The distance between two adjacent slots is the same as the distance between two adjacent pipettes.

[0029] After the liquid in the pipette is squeezed into the beaker 10, the weight is obtained according to the analytical balance 9. The volume is calculated by the weight and the liquid density. The volume is compared with the aspiration capacity of the pipette to determine whether it is the same or within the specified error range.

[0030] exist Figure 1 , Figure 3 and Figure 4In the middle section: Support blocks 11 are fixedly attached to both the left and right surfaces of the main board 2. A support rod 12 is movably connected through the inside of the support block 11. The lower end of the support rod 12 is fixedly attached to the upper surface of the calibration table 1. A displacement mechanism 13 is provided on the rear surface of the main board 2. The displacement mechanism 13 includes an adjustment frame 14. The front end of the adjustment frame 14 is fixedly attached to the rear surface of the main board 2. A rack 15 is slidably connected to the inner rear surface of the adjustment frame 14. The lower end of the rack 15 is fixedly attached to the upper surface of the calibration table 1. A rotating rod 16 is rotatably connected through the left side surface of the adjustment frame 14. The outside of the rotating rod 16 is located at the adjustment frame 14. A gear 17 is fixedly sleeved on the inner side of the adjustment frame 14, and a rack 15 is meshed with the gear 17. A ratchet 18 is fixedly sleeved on the outer side of the rotating rod 16 on the left side of the adjustment frame 14. An adjustment component 19 is provided on the left side surface of the adjustment frame 14 behind the rotating rod 16. The adjustment component 19 includes a second spring 20. A positioning block 21 is fixedly connected to the rear end of the second spring 20, and a pawl 22 is fixedly connected to the front end of the second spring 20. The pawl 22 is movably attached to the ratchet 18. A positioning rod 23 is rotatably connected to the upper end of the pawl 22. The right ends of the positioning block 21 and the positioning rod 23 are both fixedly connected to the left side surface of the adjustment frame 14.

[0031] Rotating rod 16 and adjusting frame 14 are rotatably connected by bearings;

[0032] Pad 22 engages with ratchet 18, allowing ratchet 18 and lever 16 to rotate counterclockwise normally but not clockwise. Pulling pad 22 away from ratchet 18 allows ratchet 18 and lever 16 to rotate clockwise.

[0033] When the main board 2 is raised, the gear 17 rotates counterclockwise under the constraint of the rack 15, and the ratchet 18 rotates synchronously and locks its position through the pawl 22 to achieve height self-locking. When adjusting downwards, the tail end of the pawl 22 needs to be pulled outwards to overcome the elastic force of the spring 20, so that the pawl 22 disengages from the tooth groove of the ratchet 18, and then the main board 2 is slowly lowered to the target height. This ensures that when installing pipettes of different sizes, the pipette is neither too close nor too far from the beaker 10.

[0034] The working principle of this utility model is as follows: During operation, the pipette to be tested is first inserted into the clamping hole of the clamping mechanism 3. The screw 7 is rotated to push the front clamping plate 5 to move backward, which, together with the elastic force of the rear clamping plate 5 and the spring 6, clamps the pipette. The height of the main plate 2 is adjusted by the displacement mechanism 13: the main plate 2 is directly raised upward so that the gear 17 rotates counterclockwise (at this time, the pawl 22 is locked in the ratchet 18 to prevent it from falling back), or the main plate 2 is supported and the pawl 22 is pulled outward to disengage from the ratchet 18 and then the main plate 2 is slowly lowered so that the pipette tip is kept at a suitable distance from the beaker 10. During the testing process, the pressing end of all pipettes is pressed down at the same time using a tool to squeeze the pure water drawn from the pipette into the corresponding beaker 10 at once. After weighing the liquid with the analytical balance 9, the actual volume is calculated by combining the water temperature and density. The volume is compared with the nominal capacity of the pipette to determine whether it is within the specified error range.

[0035] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A pipette capacity calibration platform, including a calibration table (1) and a main board (2) located above the calibration table (1). The front surface of the main board (2) is provided with multiple clamping mechanisms (3) from left to right. The upper surface of the calibration table (1) is provided with multiple analytical balances (9) from left to right. A beaker (10) is placed on the upper surface of the analytical balances (9). Its features are, Support blocks (11) are fixedly connected to both the left and right sides of the main board (2). A support rod (12) is movably connected through the inside of the support block (11). A displacement mechanism (13) is provided on the rear surface of the main board (2). The displacement mechanism (13) includes an adjustment frame (14). A rack (15) is slidably connected to the inner rear surface of the adjustment frame (14). A rotating rod (16) is rotatably connected through the left side surface of the adjustment frame (14). A gear (17) is fixedly sleeved on the outside of the rotating rod (16) on the inside of the adjustment frame (14). A ratchet (18) is fixedly sleeved on the outside of the rotating rod (16) on the left side of the adjustment frame (14). An adjustment component (19) is provided on the left side surface of the adjustment frame (14) behind the rotating rod (16).

2. The pipette capacity calibration platform according to claim 1, characterized in that, The clamping mechanism (3) includes a clamping frame (4), and clamping plates (5) are installed on both the front and rear sides of the clamping frame (4). Multiple springs (6) are fixedly connected to the rear surface of the rear clamping plate (5). A screw (7) is rotatably connected to the front surface of the front clamping plate (5), and slide rods (8) are fixedly connected to the left and right sides of the front surface of the front clamping plate (5) on the screw (7).

3. The pipette capacity calibration platform according to claim 1, characterized in that, The adjusting component (19) includes a second spring (20), a positioning block (21) is fixedly connected to the rear end of the second spring (20), and a pawl (22) is fixedly connected to the front end of the second spring (20). A positioning rod (23) is rotatably connected to the upper end of the pawl (22).

4. The pipette capacity calibration platform according to claim 1, characterized in that, The number of clamping mechanisms (3) and analytical balances (9) is the same, and the clamping mechanism (3) is located directly above the analytical balances (9). The lower end of the support rod (12) is fixed to the upper surface of the calibration table (1). The front end of the adjustment frame (14) is fixed to the rear surface of the main board (2). The lower end of the rack (15) is fixed to the upper surface of the calibration table (1). The rack (15) is meshed with the gear (17).

5. The pipette capacity calibration platform according to claim 2, characterized in that, The rear end of the clamping frame (4) is fixed to the front surface of the main board (2), the rear end of the spring (6) is fixed to the inner rear surface of the clamping frame (4), the screw (7) is threaded through and connected to the front surface of the clamping frame (4), and the slide bar (8) moves through the front surface of the clamping frame (4).

6. The pipette capacity calibration platform according to claim 3, characterized in that, The pawl (22) is movably attached to the ratchet (18), and the right ends of the positioning block (21) and the positioning rod (23) are fixed to the left side surface of the adjustment frame (14).

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