Anti-dripping mechanism and pipetting device

Abstract

The utility model relates to the field of medical supplies, and discloses an anti-dripping mechanism and a pipetting device.The anti-dripping mechanism comprises a mounting seat, an anti-dripping driving source arranged on the mounting seat, a transmission mechanism in transmission connection with the anti-dripping driving source and a liquid receiving plate arranged below the mounting seat, and the anti-dripping driving source is used for driving the liquid receiving plate to move forwards to the dripping liquid receiving station in the horizontal direction through the transmission mechanism or move backwards to the lower part of the retraction mounting seat. The anti-dripping driving source is mounted on the mounting seat, and the running path of the anti-dripping driving source is changed by the transmission mechanism, so that the anti-dripping mechanism can be more compact while the liquid receiving plate is driven to move back and forth. According to the pipetting device, through the arranged pipetting lifting mechanism, the pipetting pipe can move in a reciprocating mode in the vertical direction.

Description

Technical Field

[0001] The utility model relates to the field of medical supplies, in particular to an anti-drip mechanism and a liquid transfer device. Background Art

[0002] In chemical testing or medical diagnosis, the collection and processing of sample reagents are indispensable. The collected sample reagents are usually stored in sample tubes. When analyzing, the sample reagents need to be extracted from the sample tubes into containers such as test tubes or multi-well culture plates. Therefore, in order to quickly and safely extract the sample reagents from the sample tubes, the pipetting device commonly used in the cup processing system is an indispensable device. During the use of the pipetting device, the sample reagents often drip during the movement of the pipetting device after the sample reagents are absorbed, which easily leads to cross contamination. Therefore, a drip-proof structure comes into being. The existing drip-proof structure generally includes a liquid collecting plate and a linear driving source for driving the liquid collecting plate to extend and retract forward and backward, that is, when the pipette takes liquid downward, the linear driving source drives the liquid collecting plate to move backward to provide avoidance for the downward movement of the pipette; when the pipette completes the liquid taking and moves upward, the linear driving source drives the liquid collecting plate to move forward, so that the liquid collecting plate is located below the pipette to collect the liquid that may drip from the pipette. However, the aforementioned anti-drip structure that adopts the front-to-back telescopic type occupies a large volume of the liquid transfer device, and the compactness needs to be improved.

[0003] It can be seen that the existing technology still needs to be improved and enhanced. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present utility model is to provide an anti-drip mechanism and a liquid transfer device, aiming to change the position of the anti-drip driving source, and utilize the transmission mechanism to drive the liquid receiving plate to move back and forth, so as to make the anti-drip mechanism more compact.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A drip-proof mechanism comprises a mounting seat, a drip-proof driving source arranged on the mounting seat, a transmission mechanism connected to the drip-proof driving source, and a liquid receiving plate arranged below the mounting seat, wherein the drip-proof driving source is used to drive the liquid receiving plate to move forward in a horizontal direction to a drip-proof liquid receiving position, or move backward to retract below the mounting seat through the transmission mechanism.

[0007] The anti-drip mechanism, wherein the output end of the anti-drip driving source passes through the upper and lower side walls of the liquid receiving plate; the transmission mechanism includes a driving gear arranged on the output end of the anti-drip driving source, a gear shaft fixedly connected to the lower surface of the mounting seat, a driven gear rotatably connected to the gear shaft, and a rack fixedly connected to the upper surface of the liquid receiving plate; the driving gear is meshed with the driven gear, and the driven gear is meshed with the rack; the extension direction of the rack is parallel to the moving direction of the liquid receiving plate.

[0008] The anti-drip mechanism, wherein the liquid receiving plate is provided with a liquid receiving groove, and the extension direction of the liquid receiving groove is parallel to the moving direction of the liquid receiving plate.

[0009] The anti-drip mechanism, wherein a first guide rail is fixedly connected to the lower surface of the mounting seat, and the extension direction of the first guide rail is parallel to the moving direction of the liquid receiving plate; a first slider is provided on the upper surface of the liquid receiving plate, and the first slider is slidably connected to the first guide rail.

[0010] The anti-drip mechanism is characterized in that two travel switches are provided on one side wall of the mounting seat, and the connecting line of the two travel switches is parallel to the moving direction of the liquid receiving plate; a baffle is provided on one side wall of the liquid receiving plate, and the two travel switches and the baffle are located on the same side, and the baffle moves back and forth between the two travel switches.

[0011] The anti-drip mechanism is characterized in that a limiting hole is provided on the liquid receiving plate, and an extension direction of the limiting hole is parallel to a moving direction of the liquid receiving plate; the mounting seat is fixedly connected to a limiting column, and an end of the limiting column is located in the limiting hole.

[0012] A pipetting device comprises the anti-drip mechanism and a pipetting lifting mechanism; the pipetting lifting mechanism comprises a pipetting drive source vertically arranged on the anti-drip mechanism, a pipetting pump connected to the pipetting drive source, and a pipette connected to the pipette pump, wherein the pipetting drive source is used to drive the pipetting pump and the pipette to rise or fall in the vertical direction.

[0013] The pipetting device, wherein the pipetting drive source includes a pipetting drive motor with an output end facing downward, a lead screw transmission-connected to the output end of the pipetting drive motor, and a nut seat threadedly connected to the lead screw; the side wall of the nut seat is fixedly connected to the pipetting pump; the lead screw extends vertically, and the mounting seat is also provided with a bearing rotatably connected to the lower end of the lead screw.

[0014] The pipetting device, wherein a second guide rail extending vertically is provided on the mounting seat, a second slider is fixedly connected to the side wall of the nut seat, and the second slider is slidably connected to the second guide rail.

[0015] The pipetting device described above, wherein a plurality of nut seats are provided, and the number of the pipetting pumps and the suction tubes is the same as that of the nut seats; each nut seat corresponds to one pipetting pump, and each pipetting pump corresponds to one suction tube.

[0016] The present utility model provides an anti-dripping mechanism and a pipetting device. By installing an anti-dripping driving source on a mounting seat and then using a transmission mechanism to change the operation path of the anti-dripping driving source, it is possible to drive the liquid receiving plate to move back and forth while making the anti-dripping mechanism more compact. The pipetting device can make the suction tube reciprocate in the vertical direction through the provided pipetting lifting mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the pipetting device in the drip receiving state.

[0018] Figure 2 It is a side view of the pipetting device in the drip receiving state.

[0019] Figure 3 It is a schematic structural diagram of the pipetting device when the liquid receiving plate is in the retracted state.

[0020] Figure 4 It is a schematic structural diagram of the anti-dripping mechanism in the drip receiving state.

[0021] Figure 5 It is an exploded view of the anti-dripping mechanism in the drip receiving state.

[0022] Figure 6 It is a schematic structural diagram of the anti-dripping mechanism when the liquid receiving plate is in the retracted state.

[0023] MAIN ELEMENT SYMBOL DESCRIPTION: 1 - Pipetting lifting mechanism, 11 - Pipetting driving source, 111 - Pipetting driving motor, 112 - Lead screw, 113 - Nut seat, 114 - Second slider, 12 - Pipetting pump, 13 - Suction tube, 2 - Anti-dripping mechanism, 21 - Mounting seat, 211 - First guide rail, 212 - Travel switch, 213 - Limit post, 214 - Second guide rail, 22 - Anti-dripping driving source, 23 - Transmission mechanism, 231 - Driving gear, 232 - Gear shaft, 233 - Driven gear, 234 - Rack, 24 - Liquid receiving plate, 241 - Liquid receiving groove, 242 - First slider, 243 - Flap, 244 - Limit hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The utility model provides an anti-drip mechanism and a liquid transfer device. In order to make the purpose, technical solution and effect of the utility model clearer and more specific, the utility model is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the protection scope of the utility model.

[0025] See also Figure 2 , Figure 4 and Figure 6 The utility model provides an anti-drip mechanism 2, comprising a mounting seat 21, an anti-drip driving source 22 arranged on the mounting seat 21, a transmission mechanism 23 transmission-connected to the anti-drip driving source 22, and a liquid receiving plate 24 arranged below the mounting seat 21, wherein the anti-drip driving source 22 is used to drive the liquid receiving plate 24 to move forward in a horizontal direction to a drip receiving position, or to move backward to retract below the mounting seat 21 through the transmission mechanism 23.

[0026] In actual use, the pipetting lifting mechanism 1 is in operation, and performs downward sampling, or the process of moving upward after completing sampling. When the pipetting lifting mechanism 1 is in the process of moving upward after completing sampling, the anti-drip driving source 22 is in operation at the same time, and the liquid receiving plate 24 is driven to move forward under the action of the transmission mechanism 23, so that the front end of the liquid receiving plate 24 protrudes from the mounting seat 21, and the liquid receiving plate 24 gradually moves to the drip receiving station, and the liquid receiving plate 24 can be used to catch the sample reagent dripping from the pipetting lifting mechanism 1 to avoid cross contamination. When sampling is required again, the anti-drip driving source 22 is operated again, and under the action of the transmission mechanism 23, the liquid receiving plate 24 is driven to move backward, so that the liquid receiving plate 24 is retracted to the bottom of the mounting seat 21, providing avoidance for the downward movement of the pipetting lifting mechanism 1.

[0027] The above device can drive the liquid receiving plate 24 to move forward and backward while making the anti-drip mechanism 2 more compact by installing the anti-drip driving source 22 on the mounting seat 21 and then using the transmission mechanism 23 to change the running path of the anti-drip driving source 22.

[0028] See also Figures 4 - 6, in some embodiments, the output end of the anti-drip liquid driving source 22 penetrates through the upper and lower side walls of the liquid receiving plate 24; the transmission mechanism 23 includes a driving gear 231 arranged on the output end of the anti-drip liquid driving source 22, a gear shaft 232 fixedly connected to the lower surface of the mounting base 21, a driven gear 233 rotatably connected to the gear shaft 232, and a rack 234 fixedly connected to the upper surface of the liquid receiving plate 24; the driving gear 231 meshes with the driven gear 233, and the driven gear 233 meshes with the rack 234; the extending direction of the rack 234 is parallel to the moving direction of the liquid receiving plate 24. Specifically, the output end of the anti-drip liquid driving source 22 is vertically downward, driving the driving gear 231 to rotate. Using the principle of meshing with each other, the driven gear 233 is driven to rotate. Since the rack 234 is fixedly connected to the liquid receiving plate 24, when the driven gear 233 rotates, the rack 234 will drive the liquid receiving plate 24 to move forward or backward synchronously under the guiding action of the driven gear 233. The above structure can make full use of the space between the mounting base 21 and the liquid receiving plate 24, making the liquid transfer device more compact and small.

[0029] Please refer to Figures 4 - 6 , in some embodiments, a liquid receiving groove 241 is formed on the liquid receiving plate 24, and the extending direction of the liquid receiving groove 241 is parallel to the moving direction of the liquid receiving plate 24. By providing the liquid receiving groove 241, a position for collecting the sample reagent dripping from the liquid suction pipe 13 is provided. Please refer to Figure 1 , and at the same time, since a plurality of liquid suction pipes 13 are provided, by limiting the extending direction of the liquid receiving groove 241, the liquid receiving groove 241 is located directly below the plurality of liquid suction pipes 13, facilitating the collection of the dripping sample reagent.

[0030] Please refer to Figure 5 , in some embodiments, a first guide rail 211 is fixedly connected to the lower surface of the mounting base 21, and the extending direction of the first guide rail 211 is parallel to the moving direction of the liquid receiving plate 24; a first slider 242 is arranged on the upper surface of the liquid receiving plate 24, and the first slider 242 is slidably connected to the first guide rail 211. During the forward or backward movement of the liquid receiving plate 24, by using the arrangement of the first guide rail 211 and the first slider 242, the moving stability of the liquid receiving plate 24 can be improved.

[0031] Please refer to Figures 4 - 6 , in some embodiments, two travel switches 212 are arranged on one side wall of the mounting base 21 ( Figures 4 - 6 What is indicated in is the circuit board of the travel switch 222, and the two travel switches 212 are located on the other side wall of the circuit board (please refer to Figure 2)) The connection line of the two travel switches 212 is parallel to the moving direction of the liquid receiving plate 24; a baffle 243 is provided on one side wall of the liquid receiving plate 24, and the two travel switches 212 and the baffle 243 are located on the same side, and the baffle 243 reciprocates between the two travel switches 212. Specifically, when the baffle 243 moves to the position of the rear travel switch 212, it means that the liquid receiving plate 24 has retracted in place; when the baffle 243 moves to the position of the front and rear travel switches 212, it means that the liquid receiving plate 24 has moved forward in place and is in the liquid receiving state, that is, the liquid receiving plate 24 is directly below the liquid suction pipe 13. The above settings can provide limit signals for the operation of the anti-drip liquid drive source 22. Specifically, the anti-drip liquid drive source 22 is a forward and reverse motor, and the forward and reverse rotation of the motor realizes the reciprocating movement of the liquid receiving plate 24 back and forth.

[0032] Please refer to Figures 4 - 6 , in some embodiments, a limit hole 244 is provided on the liquid receiving plate 24, and the extending direction of the limit hole 244 is parallel to the moving direction of the liquid receiving plate 24; a limit post 213 is fixedly connected to the mounting seat 21, and the end of the limit post 213 is located in the limit hole 244. Specifically, the hole length of the limit hole 244 is greater than the moving stroke of the limit post 213, that is, under normal circumstances, the limit post 213 will not contact the hole walls at the front and rear ends of the limit hole 244. By providing the limit hole 244 and the limit post 213, it is used to prevent the anti-drip liquid drive source 22 from not knowing when to stop running or turn when any one or both of the travel switches 212 fail, that is, it plays a protective role.

[0033] Please refer to Figures 1 - 3 , in some embodiments, the present invention also provides a liquid transfer device, including an anti-drip liquid mechanism 2 and a liquid transfer lifting mechanism 1; the liquid transfer lifting mechanism 1 includes a liquid transfer drive source 11 vertically arranged on the anti-drip liquid mechanism 2, a liquid transfer pump 12 connected to the liquid transfer drive source 11, and a liquid suction pipe 13 connected to the liquid transfer pump 12, and the liquid transfer drive source 11 is used to drive the liquid transfer pump 12 and the liquid suction pipe 13 to rise or fall in the vertical direction.

[0034] During actual use, the liquid transfer drive source 11 can drive the liquid transfer pump 12 and the liquid suction pipe 13 to move downward as a whole. The liquid transfer pump 12 provides negative pressure inside the liquid suction pipe 13, which is convenient for the liquid suction pipe 13 extending into the sample tube to suck the sample reagent in the sample tube; after quantitative sampling is completed, the liquid transfer drive source 11 drives the liquid transfer pump 12 and the liquid suction pipe 13 to move upward as a whole.

[0035] Please refer to Figure 2 and Figure 3, in some embodiments, the pipetting drive source 11 includes a pipetting drive motor 111 with an output end facing downward, a lead screw 112 drivingly connected to the output end of the pipetting drive motor 111, and a nut seat 113 threadedly connected to the lead screw 112; the side wall of the nut seat 113 is fixedly connected to the pipetting pump 12; the lead screw 112 extends vertically, and a bearing rotatably connected to the lower end of the lead screw 112 is further provided on the mounting seat 21. In practical applications, by the rotation of the pipetting drive motor 111, the lead screw 112 is driven to rotate synchronously, so that the nut seat 113, the pipetting pump 12 fixedly connected to the nut seat 113, and the liquid suction pipe 13 connected to the pipetting pump 12 can change their positions relative to the lead screw 112, that is, the reset when the liquid suction pipe 13 rises or the sampling when the liquid suction pipe 13 descends is realized.

[0036] Please refer to Figure 2 , in some embodiments, a second guide rail 214 extending vertically is provided on the mounting seat 21, a second slider 114 is fixedly connected to the side wall of the nut seat 113, and the second slider 114 is slidably connected to the second guide rail 214. Through the above settings, the moving stability of the nut seat 113, the pipetting pump 12, and the liquid suction pipe 13 is improved, the shaking is reduced, and the sample reagent in the liquid suction pipe 13 or the sample reagent on the outer wall of the liquid suction pipe 13 is prevented from dripping.

[0037] Please refer to Figure 3 , in some embodiments, a plurality of nut seats 113 are provided, and the number of the pipetting pumps 12 and the liquid suction pipes 13 is the same as that of the nut seats 113; each nut seat 113 corresponds to one pipetting pump 12, and each pipetting pump 12 corresponds to one liquid suction pipe 13. In order to improve the sampling speed, generally, a plurality of pipetting lifting mechanisms 1 are provided, and each pipetting lifting mechanism 1 is electrically connected to the control mechanism respectively, so as to realize the independent operation of each pipetting lifting mechanism 1.

[0038] In summary, by mounting the anti-dripping drive source 22 on the mounting seat 21 and then using the transmission mechanism 23 to change the operation path of the anti-dripping drive source 22, the present utility model can drive the liquid receiving plate 24 to move back and forth while making the anti-dripping mechanism 2 more compact.

[0039] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, 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.

[0040] In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0041] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, an electrical connection or a connection that can communicate with each other; it may be a direct connection, or an indirect connection through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements. 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 circumstances.

[0042] It can be understood that for those of ordinary skill in the art, equivalent substitutions or changes can be made according to the technical solutions and inventive concepts of the present utility model, and all such changes or substitutions should fall within the protection scope of the present utility model.

Claims

1. A drip prevention mechanism, characterized in that: It includes a mounting seat, an anti-drip liquid driving source arranged on the mounting seat, a transmission mechanism connected to the anti-drip liquid driving source, and a liquid receiving plate arranged below the mounting seat. The anti-drip liquid driving source is used to drive the liquid receiving plate to move forward in the horizontal direction to the drip liquid receiving position, or move backward to retract below the mounting seat through the transmission mechanism.

2. The drip-proof mechanism according to claim 1, characterized in that: The output end of the drip-proof driving source passes through the upper and lower side walls of the liquid receiving plate; the transmission mechanism includes a driving gear arranged on the output end of the drip-proof driving source, a gear shaft fixedly connected to the lower surface of the mounting seat, a driven gear rotatably connected to the gear shaft, and a rack fixedly connected to the upper surface of the liquid receiving plate; The driving gear is meshed with the driven gear, and the driven gear is meshed with the rack; an extending direction of the rack is parallel to a moving direction of the liquid receiving plate.

3. The drip-proof mechanism according to claim 2, characterized in that: The liquid receiving plate is provided with a liquid receiving groove, and an extending direction of the liquid receiving groove is parallel to a moving direction of the liquid receiving plate.

4. The drip prevention mechanism according to claim 2, characterized in that: A first guide rail is fixedly connected to the lower surface of the mounting seat, and the extension direction of the first guide rail is parallel to the moving direction of the liquid receiving plate; a first slider is arranged on the upper surface of the liquid receiving plate, and the first slider is slidably connected to the first guide rail.

5. The drip prevention mechanism according to claim 2, characterized in that: Two travel switches are arranged on one side wall of the mounting seat, and the connecting line of the two travel switches is parallel to the moving direction of the liquid receiving plate; a baffle is arranged on one side wall of the liquid receiving plate, and the two travel switches and the baffle are located on the same side, and the baffle moves back and forth between the two travel switches.

6. The drip prevention mechanism according to claim 5, characterized in that: The liquid receiving plate is provided with a limiting hole, and an extending direction of the limiting hole is parallel to a moving direction of the liquid receiving plate; the mounting seat is fixedly connected to a limiting column, and an end of the limiting column is located in the limiting hole.

7. A liquid transfer device, characterized in that: It includes the anti-drip mechanism as described in any one of claims 1 to 6, and a pipetting lifting mechanism; the pipetting lifting mechanism includes a pipetting drive source vertically arranged on the anti-drip mechanism, a pipetting pump connected to the pipetting drive source, and a pipette connected to the pipette pump, and the pipetting drive source is used to drive the pipetting pump and the pipette to rise or fall in the vertical direction.

8. The liquid transfer device according to claim 7, characterized in that: The pipetting drive source includes a pipetting drive motor with an output end facing downward, a lead screw transmission-connected to the output end of the pipetting drive motor, and a nut seat threadedly connected to the lead screw; the side wall of the nut seat is fixedly connected to the pipetting pump; the lead screw extends vertically, and the mounting seat is also provided with a bearing rotatably connected to the lower end of the lead screw.

9. The liquid transfer device according to claim 8, characterized in that: A second guide rail extending vertically is arranged on the mounting seat, a second sliding block is fixedly connected to the side wall of the nut seat, and the second sliding block is slidably connected to the second guide rail.

10. The liquid transfer device according to claim 8, characterized in that: The nut seats are provided in plurality, and the number of the pipette pumps and the pipette tubes is consistent with the number of the nut seats; each of the nut seats corresponds to one of the pipette pumps, and each of the pipette pumps corresponds to one of the pipette tubes.

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