Pipetting device with controllable number of gun heads

Abstract

The utility model relates to the field of pipetting devices, solves the problem that the number of gun heads cannot be adjusted when the conventional pipetting device is used for pipetting liquid, and provides a pipetting device with a controllable number of gun heads, which comprises an accommodating seat, the gun heads and a rotating shaft pressing rod, the containing seat is provided with a through hole, the hole wall of the through hole is provided with a plurality of containing grooves used for containing the gun heads in the length direction of the through hole, the bottom wall of each containing groove is provided with a through hole used for allowing the end of the corresponding gun head to penetrate through, and the bottom wall of each containing groove is provided with an elastic piece; the gun head is installed in the containing groove, and the end, away from the bottom wall of the containing groove, of the elastic piece is connected with the gun head. The rotating shaft pressing rod is arranged in the through hole in a penetrating mode and can rotate in the through hole, a plurality of collecting grooves with different lengths are formed in the rotating shaft pressing rod in the circumferential direction of the rotating shaft pressing rod, and the different collecting grooves can contain different gun heads. The number of the collected gun heads can be adjusted through the collecting grooves with different lengths in the rotating shaft pressing rod, and then the use number of the gun heads is adjusted.

Description

Technical Field

[0001] This utility model relates to the field of pipetting devices, and more specifically, to a pipetting device with a controllable number of pipette tips. Background Technology

[0002] A pipette is a type of pipette commonly used in laboratories for transferring small or micro-volume liquids. Different sizes of pipettes are used with different sized tips. They are widely used in immunology, biochemistry, clinical diagnostics, and food analysis. To allow the transfer of liquid from multiple test tubes at once, existing pipetting devices are often equipped with multiple tips, primarily 8-channel and 16-channel. For example, patent CN221132309U discloses a multi-channel pipette with a fixed number of tips and a fixed number of test tubes that can be transferred at a time, resulting in limited applicability. Because the channels in existing pipettes are designed for simultaneous aspiration and dispensing, when using an 8-channel pipette to transfer liquid from six test tubes, two additional tips are required, wasting the tips on these additional tips. Furthermore, since the number of test tubes receiving liquid is also six, dispensing liquid from the receiving area may result in liquid being dispensed outside the deep-well plate or even into other sample wells, further hindering its applicability.

[0003] There is an urgent need for a pipetting device with an adjustable number of pipette tips to adapt to different usage scenarios and solve the aforementioned problems. Utility Model Content

[0004] The purpose of this invention is to provide a pipetting device with a controllable number of pipette tips, thereby solving the problem that the number of pipette tips cannot be adjusted when the existing pipetting device is used to transfer liquid.

[0005] The embodiments of this utility model are achieved through the following technical solutions:

[0006] A pipetting device with a controllable number of pipette tips includes: a receiving seat, pipette tips, and a rotating pressure rod; the receiving seat has a through hole, and the wall of the through hole has a plurality of receiving grooves for receiving pipette tips along its length direction; the bottom wall of the receiving groove has an opening for the tip of the pipette tip to pass through, and the bottom wall of the receiving groove has an elastic element; the pipette tip is installed in the receiving groove, and the end of the elastic element away from the bottom wall of the receiving groove is connected to the pipette tip; the rotating pressure rod passes through the through hole and can rotate within the through hole, and the rotating pressure rod has a plurality of retraction grooves of different lengths along its circumference, and the number of pipette tips that can be received by different retraction grooves is different.

[0007] Preferably, adjacent retractable slots are interconnected in the circumferential direction of the rotating shaft pressure rod.

[0008] Preferably, there is a gap between the longest and shortest retractable slots, the width of which is greater than the end of the gun head furthest from the through hole, and the gap is used to press down the entire gun head.

[0009] Preferably, adjacent retractable slots are spaced apart in the circumferential direction of the rotating shaft pressure rod.

[0010] Preferably, the length of the plurality of the retractable grooves gradually increases or decreases as they are arranged circumferentially along the rotating shaft pressure rod.

[0011] Preferably, the plurality of the take-up slots include: an increasing group and a decreasing group, wherein the length of the take-up slots in the increasing group increases sequentially; and the length of the take-up slots in the decreasing group decreases sequentially starting from the end of the increasing group.

[0012] Preferably, there is a gap between the head of the increasing group and the tail of the decreasing group, the gap being used to press down all the gun heads.

[0013] Preferably, the elastic element is a spring, and the gun head includes an insertion section and a limiting section. The insertion section is inserted into the spring, and the end of the insertion section can pass through the through hole. The limiting section is connected to the end of the insertion section away from the through hole, and the limiting section is located above the spring. At least a portion of the orthographic projection of the limiting section toward the through hole is located outside the area enclosed by the spring.

[0014] Preferably, the end of the limiting segment away from the insertion segment is spherical.

[0015] Preferably, the rotating shaft pressure rod includes: a working section and a connecting section, the retraction groove is provided in the working section; each end of the working section is connected to a connecting section, the diameter of the connecting section is smaller than that of the working section; the pipetting device further includes: a bearing, the bearing is sleeved in the connecting section, the inner ring of the bearing is connected to the working section, and the outer ring of the bearing is connected to the receiving seat.

[0016] This utility model has at least the following beneficial effects:

[0017] This invention allows for adjustment of the number of retractable pipette tips by using retractable slots of different lengths on the rotating shaft pressure rod, thereby adjusting the number of pipette tips that can be used. For example, when the retractable slot that can accommodate two pipette tips is rotated to the top of the pipette tips, the two pipette tips retract into the retractable slot under the action of the elastic element. After the remaining six pipette tips are assembled with the pipette, six test tubes can be pipetted. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of a pipetting device with a controllable number of pipette tips;

[0020] Figure 2 A cross-sectional view of a pipetting device with a controllable number of pipette tips;

[0021] Figure 3 This is a schematic diagram of the working state of a pipetting device;

[0022] Figure 4 This is a sectional view of the layout of the collection trough;

[0023] Figure 5 The first front view of the layout of the sink;

[0024] Figure 6 The second front view of the layout of the sink;

[0025] Figure 7 The third front view of the layout of the sink;

[0026] Figure 8 A layout diagram for the collection channel;

[0027] Icons: 1-Receiving seat, 11-Through hole, 111-Receiving groove, 1111-Opening, 1112-Elastic element, 2-Gun head, 21-Insertion section, 22-Limiting section, 3-Rotating shaft pressure rod, 31-Retraction groove, 311-Increasing group, 312-Decreasing group, 32-Working section, 33-Connecting section, 4-Bearing, 5-Motor, 6-Driving gear, 7-Driven gear, 8-Deep hole plate. Detailed Implementation

[0028] To make the objectives, methods, and advantages of the embodiments of this utility model clearer, the methods in the embodiments of this utility model will be clearly and completely described. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0029] Example 1: As Figure 1-3As shown, a pipetting device with a controllable number of pipette tips includes: a receiving base 1, pipette tips 2, and a rotating shaft pressure rod 3; the receiving base 1 has a through hole 11, and the wall of the through hole 11 has a plurality of receiving grooves 111 for receiving pipette tips 2 along its length direction, the bottom wall of the receiving groove 111 has an opening 1111 for the end of the pipette tip 2 to pass through, and the bottom wall of the receiving groove 111 has an elastic element 1112; the pipette tip 2 is installed in the receiving groove 111, and one end of the elastic element 1112 away from the bottom wall of the receiving groove 111 is connected to the pipette tip 2; the rotating shaft pressure rod 3 passes through the through hole 11 and can rotate within the through hole 11, and the rotating shaft pressure rod 3 has a plurality of retraction grooves 31 of different lengths along its circumference, and the number of pipette tips 2 that can be received by different retraction grooves 31 is different.

[0030] In specific implementation, the elastic element 1112 can be made of spring, rubber, or silicone, etc. The connection between the elastic element 1112 and the gun head 2 can be a fixed connection or an abutment connection. The elastic element 1112 can transmit the rebound force to the gun head 2, causing the gun head 2 to move. The drive of the rotating shaft pressure rod 3 can be as follows: Figure 1 As shown, a motor 5 is installed on the top of the receiving seat 1. The output shaft of the motor 5 is connected to a drive gear 6, and a driven gear 7 is installed at the end of the rotating shaft pressure rod 3. The drive gear 6 and the driven gear 7 are connected in a transmission relationship, which enables the rotating motor 5 to drive the rotating shaft pressure rod 3 to rotate. The width of the retractable groove 31 is as follows: Figure 2 As shown, it can be adapted to the gun head 2. To increase the stability of the gun head 2 during movement, a slider can be provided on the side wall of the gun head 2, and a slide rail that cooperates with the slider can be provided on the groove wall of the receiving groove 111. Figure 1 As shown, a hose connector can be provided on the back of each nozzle 2. The number and length of the retraction grooves 31 can be set according to the number of nozzles 2 and the width of nozzles 2 as needed, and this embodiment does not impose specific limitations.

[0031] Exemplary, such as Figure 2 As shown, taking an 8-head 2 as an example, when only two heads 2 are needed, the rotating shaft pressure rod 3 is rotated, causing the retractable groove 31, which can accommodate 6 heads 2, to rotate above the heads 2. Under the rebound action of the elastic element 1112, the heads 2 enter the retractable groove 31. At this time, as shown... Figure 2 As shown, only the two gun heads 2 are pressed down by the rotating shaft pressure rod 3, then see Figure 3 Move the pipette to the corresponding position on the deep well plate 8. The pipette tip is placed on the deep well plate 8. After pressing down the pipette, the pipette tip 2 can be assembled with the pipette tip. Since only two pipette tips 2 protrude downwards, only two pipette tips 2 are assembled with the pipette tip during the downward movement of the pipette, which can avoid the waste of disposable pipette tips. Finally, the liquid can be transferred according to the normal operation.

[0032] Example 2: To facilitate the adjustment of the number of gun heads 2, improvements were made based on Example 1, such as... Figure 4 and Figure 7 As shown, in this embodiment, adjacent retractable grooves 31 are interconnected in the circumferential direction of the rotating shaft pressure rod 3.

[0033] In the specific implementation process Figure 4 This only shows the arrangement of the retractable slots 31 along the circumferential direction of the rotation axis; the relationship between the retractable slots 31 is not specified. For example... Figure 5-6 As shown, there can be gaps between the retractable slots 31, or they can be arranged as follows: Figure 7 As shown, the retractable slots 31 are interconnected in the width direction. Furthermore, each retractable slot 31 can be configured as follows: Figure 5 As shown, it is a tank, or it can be like... Figure 6 As shown, it is composed of multiple sub-slots. The specific arrangement can be determined based on the spacing between adjacent gun heads 2. For example, when the spacing between adjacent gun heads 2 is large, in order to ensure the stability of each gun head 2's movement and reduce its lateral movement space, a method such as... Figure 6 The arrangement of the retractable slots 31 shown can be used when the interval between adjacent gun heads 2 is small, as follows: Figure 5 The arrangement of the retractable slots 31 is shown.

[0034] When the slot 31 is retracted Figure 7 When interconnected as shown, during the switching of the number of gun heads 2, there will be no back-and-forth movement of one or more gun heads 2, and the rotation angle of the rotating shaft lever 3 will also be smaller. As an example, the number of usable gun heads 2 can be adjusted from two to four. Figure 5 As shown, there are gaps between the retraction slots 31. When the rotating shaft pressure rod 3 is rotated, the gun head 2 will be pressed down by the rotating shaft pressure rod 3 as it moves from one retraction slot 31 to another. Then, it will be retracted under the action of the elastic element 1112. During the rotation, the more retraction slots 31 the gun head 2 passes through, the more times the gun head 2 reciprocates, which leads to increased wear and tear on the elastic element 1112, requiring frequent replacement. In addition, the angle that the rotating shaft pressure rod 3 needs to rotate increases each time the number of gun heads 2 is adjusted, making the operation inconvenient. Therefore, this embodiment limits the interconnection between adjacent retraction slots 31 to solve the aforementioned problems.

[0035] Example 3: In order to better activate all the gun heads 2, an improvement was made based on Example 2. In this example, there is a gap between the longest retractable groove 31 and the shortest retractable groove 31. The width of the gap is greater than the end of the gun head 2 away from the through hole 11. The gap is used to press down all the gun heads 2.

[0036] In the specific implementation process, when the trough 31 is retracted... Figure 7As shown, when the length increases or decreases sequentially, there is a gap between the retractable grooves 31 at both ends. That is, the retractable grooves 31 are not laid out in all 360 degrees around the rotating shaft pressure rod 3. It can also be seen that there is no direct connection between the longest retractable groove 31 and the shortest retractable groove 31. When the aforementioned gap is rotated above the gun head 2, all gun heads 2 can be pressed down, realizing the activation of all gun heads 2.

[0037] Example 4: To better meet the actual usage requirements, such as... Figure 5 As shown, in this embodiment, adjacent retractable grooves 31 are spaced apart in the circumferential direction of the rotating shaft pressure rod 3.

[0038] In practical implementation, since 8 or 16 pipette tips are the primary type used, with the remaining tips (2) serving as supplementary, to more easily adjust all tips (2) of the pipetting device to be in use, the following method can be adopted: Figure 5 The arrangement of the retractable slots 31 shown allows for easy switching to the fully open state of the gun head 2 after the state of using only part of the gun head 2 is enabled. This makes the operation simpler.

[0039] Example 5: To better control the number of gun heads 2, improvements were made based on Example 1, such as... Figure 5-7 As shown, in this embodiment, the length of several of the retractable grooves 31 gradually increases or decreases as they are arranged circumferentially along the rotating shaft pressure rod 3.

[0040] In practice, the retractable slots 31 are arranged in an orderly manner according to their length, which simplifies the programming when setting the control logic. Furthermore, when adjacent retractable slots 31... Figure 7 As shown, when they are interconnected, if the retractable slots 31 are not arranged in an orderly manner according to their length, during the switching of the number of gun heads 2, some or one gun head 2 may reciprocate multiple times, increasing the wear of the elastic element 1112.

[0041] Example 6: To better switch the number of gun heads 2 in use when motor 5 rotates in one direction, improvements were made based on Example 1, such as... Figure 8 As shown, in this embodiment, the plurality of retractable slots 31 include: an increasing group 311 and a decreasing group 312, wherein the length of the retractable slots 31 in the increasing group 311 increases sequentially; and the length of the retractable slots 31 in the decreasing group 312 decreases sequentially from the tail of the increasing group 311.

[0042] In specific implementation, the tail of the incremental group 311 refers to, for example, Figure 8 As shown, the top of the incremental group 311 is the longest retraction slot 31. Figure 8 Adjacent retractable slots 31 can be interconnected in the width direction. (The following is an example of a method used.) Figure 8 After the arrangement of the collection slots 31 shown, if the active state of the pipette head 2 in the pipetting device corresponds to the tail of the incremental group 311, when the rotating shaft pressure rod 3 rotates again, it is not necessary to rotate in the opposite direction to achieve continuous activation of the number of pipette heads 2.

[0043] Example 7: If adjacent retraction slots 31 are interconnected, an improvement is made based on Example 6. In this example, there is a gap between the head of the increasing group 311 and the tail of the decreasing group 312. The gap is used to press down all the gun heads 2.

[0044] In practice, the width of the interval can be set according to the specifications of the gun head 2.

[0045] Example 8: To better transmit the rebound force of the elastic element 1112 to the gun head 2, improvements were made based on Examples 1-7, such as... Figure 2 As shown, in this embodiment, the elastic element 1112 is a spring, and the gun head 2 includes an insertion section 21 and a limiting section 22. The insertion section 21 is inserted into the spring, and the end of the insertion section 21 can pass through the through hole 11. The limiting section 22 is connected to the end of the insertion section 21 away from the through hole 11. The limiting section 22 is located above the spring, and at least a portion of the orthographic projection of the limiting section 22 toward the through hole 11 is located outside the area enclosed by the spring.

[0046] In the specific implementation process, the cross-section of the limiting section 22 can be circular. The diameter of the maximum cross-section of the limiting section 22 is larger than the diameter of the spring, so that the limiting section 22 cannot enter the enclosed space of the spring. During the downward pressing of the gun head 2, the end of the limiting section 22 presses down on the spring. During the rebound of the gun head 2, the rebound force of the spring also directly acts on the end of the limiting section 22.

[0047] Example 9: To better achieve the switching of the number of gun heads 2 in use, improvements were made based on Example 8, such as... Figure 2 As shown, in this embodiment, the end of the limiting segment 22 away from the insertion segment 21 is spherical.

[0048] In the specific implementation process, in order to reduce the obstruction or even jamming of the gun head 2 during the movement of the gun head 2 from one retraction groove 31 to another, this embodiment sets the contact surface between the gun head 2 and the groove wall of the retraction groove 31 as a spherical surface to reduce the obstruction of the gun head 2 during the sliding process along the groove wall of the retraction groove 31.

[0049] Example 10: To increase the installation and rotational stability of the rotating shaft pressure rod 3, improvements were made based on Example 8, such as... Figure 2As shown, in this embodiment, the rotating shaft pressure rod 3 includes a working section 32 and a connecting section 33, and the retraction groove 31 is provided on the working section 32; each end of the working section 32 is connected to a connecting section 33, and the diameter of the connecting section 33 is smaller than that of the working section 32; the pipetting device also includes a bearing 4, which is sleeved on the connecting section 33, the inner ring of the bearing 4 is connected to the working section 32, and the outer ring of the bearing 4 is connected to the receiving seat 1.

[0050] In practical implementation, mounting the rotating shaft pressure rod 3 via the bearing 4 increases the rotational stability of the rotating shaft pressure rod 3. For example... Figure 2 As shown, the diameter of the connecting section 33 is smaller than that of the working section 32. The bearing 4 can be limited near the working section 32 by the end of the working section 32. A retaining ring can also be provided on the side of the bearing 4 away from the working section 32 to further improve the limiting effect. In addition, a groove can be provided in the wall of the through hole 11 to embed the outer ring of the bearing 4, which facilitates the installation and fixing of the outer ring of the bearing 4.

[0051] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pipetting device with a controllable number of pipette tips, characterized in that, include: The receiving seat (1) is provided with a through hole (11). The wall of the through hole (11) is provided with a plurality of receiving grooves (111) for receiving the gun head (2) along its length direction. The bottom wall of the receiving groove (111) is provided with an opening (1111) for the end of the gun head (2) to pass through. The bottom wall of the receiving groove (111) is provided with an elastic element (1112). Gun head (2), the gun head (2) is installed in the receiving groove (111), and the end of the elastic member (1112) away from the bottom wall of the receiving groove (111) is connected to the gun head (2); A rotating shaft pressure rod (3) is inserted through the through hole (11) and can rotate within the through hole (11). The rotating shaft pressure rod (3) has several retraction grooves (31) of different lengths along its circumference. The number of gun heads (2) that can be accommodated by different retraction grooves (31) is different.

2. The pipetting device with controllable number of pipette tips according to claim 1, characterized in that, The adjacent retractable slots (31) are interconnected in the circumferential direction of the rotating shaft pressure rod (3).

3. The pipetting device with controllable number of pipette tips according to claim 2, characterized in that, There is a gap between the longest retractable groove (31) and the shortest retractable groove (31), the width of which is greater than the end of the gun head (2) away from the through hole (11), and the gap is used to press down the entire gun head (2).

4. The pipetting device with controllable number of pipette tips according to claim 1, characterized in that, The adjacent retractable grooves (31) are spaced apart in the circumferential direction of the rotating shaft pressure rod (3).

5. The pipetting device with controllable number of pipette tips according to claim 1, characterized in that, The length of several of the retractable grooves (31) gradually increases or decreases as they are arranged circumferentially along the pivot pressure bar (3).

6. The pipetting device with controllable number of pipette tips according to claim 1, characterized in that, Several of the said retraction slots (31) include: The length of the retraction groove (31) of the incremental group (311) increases sequentially; Decreasing group (312), the length of the retraction groove (31) of the decreasing group (312) decreases sequentially from the tail of the increasing group (311).

7. The pipetting device with controllable number of pipette tips according to claim 6, characterized in that, There is a gap between the head of the increasing group (311) and the tail of the decreasing group (312), the gap being used to press down all the gun heads (2).

8. The pipetting device with controllable number of pipette tips according to any one of claims 1-7, characterized in that, The elastic element (1112) is a spring, and the gun head (2) includes: An insertion segment (21) is inserted into the spring, and the end of the insertion segment (21) can pass through the through hole (11); The limiting segment (22) is connected to the end of the insertion segment (21) away from the through hole (11). The limiting segment (22) is located above the spring. At least a portion of the orthogonal projection of the limiting segment (22) toward the through hole (11) is located outside the area enclosed by the spring.

9. The pipetting device with controllable number of pipette tips according to claim 8, characterized in that, The end of the limiting segment (22) away from the insertion segment (21) is spherical.

10. The pipetting device with controllable number of pipette tips according to claim 8, characterized in that, The rotating shaft pressure rod (3) includes: Working section (32), wherein the collection trough (31) is provided in the working section (32); A connecting segment (33) is provided at each end of the working segment (32), and the diameter of the connecting segment (33) is smaller than that of the working segment (32). The pipetting device also includes: The bearing (4) is sleeved on the connecting section (33), the inner ring of the bearing (4) is connected to the working section (32), and the outer ring of the bearing (4) is connected to the receiving seat (1).

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