Pipette pump module

Abstract

The utility model relates to a pipetting pump module which comprises a shell, a suction head withdrawing sleeve, a servo motor and a driving assembly, the driving assembly comprises a ball screw, a screw nut, a piston rod and a piston cylinder, and the servo motor can drive the ball screw to rotate so as to drive the screw nut and the piston rod to lift up and down, so that liquid suction and liquid spitting in the piston cylinder are realized. According to the pipetting pump module, the ball screw is driven to rotate through the servo motor, the screw nut and the piston rod are driven to ascend and descend vertically, liquid suction and liquid spitting in the piston cylinder are achieved, ascending and descending guiding of the piston rod is achieved through the two guide blocks, the internal structure is simplified, the area of a product is saved to the maximum extent, and the movement range of the piston rod is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of experimental instruments, in particular to a pipetting pump module. Background Art

[0002] Sampling and pipetting instruments are widely used in biochemical, molecular, and cellular biology experiments. Their function is to sample and transfer a certain volume of liquid. The pipetting mechanism is one of its core mechanisms, used to extract, transport, and transfer liquids between standard containers. Common containers include standard SBS plates (8-well, 96-well, and 384-well deep-well plates), reagent plates, and standard 1-20ml vacuum blood sample tubes.

[0003] Existing pipette pump modules are generally large in size, and the servo motor drives the piston rod to move up and down through the ball screw and screw nut. Since a guide mechanism needs to be designed when the screw nut and piston rod are moved up and down, the internal structure is complex and assembly is inconvenient. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a pipetting pump module which has a simple structure, is easy to assemble, and can reduce the overall thickness.

[0005] The utility model is achieved through the following technical solutions:

[0006] A pipette pump module includes a shell, a suction head withdrawal sleeve respectively arranged at both ends of the shell, a servo motor and a drive assembly arranged in the shell and connected to the servo motor, the drive assembly includes a ball screw, a screw nut, a piston rod and a piston cylinder, the ball screw is connected to the servo motor, the ball screw is perpendicular to the horizontal plane, the screw nut is rotatably connected to the ball screw, the top and bottom ends of the screw nut are respectively fixed with guide blocks, one end of the guide block is sleeved on the outside of the ball screw, the piston cylinder is fixed to the bottom end of the shell and sleeved in the suction head withdrawal sleeve, the piston rod is parallel to the ball screw, the top end of the piston rod is fixed to the screw nut, and the bottom end of the piston rod is inserted into the piston cylinder, the servo motor can drive the ball screw to rotate, thereby driving the screw nut and the piston rod to move up and down, thereby realizing liquid suction and discharge in the piston cylinder.

[0007] In order to accurately sense whether the lead screw nut is lifted into position, an origin sensor baffle is fixed to the lead screw nut, and an upper sensor capable of sensing the origin sensor baffle is provided in the housing.

[0008] In order to load the suction head, a slider is provided at the bottom end of the piston rod. The slider can slide up and down along the piston rod. The slider is fixed to the suction head ejection sleeve through a connecting rod. The top end of the suction head ejection sleeve is elastically connected to the housing through a spring.

[0009] In order to accurately sense whether the suction head is in place, a suction head in place detection baffle is fixed on the slider, and a lower sensor capable of sensing the suction head in place detection baffle is provided in the housing.

[0010] In order to accurately sense the pressure in the piston rod, an air pressure sensor capable of sensing the air pressure in the piston cylinder is provided in the housing.

[0011] The beneficial effects of the present invention are as follows: the pipette pump module drives the ball screw to rotate through the servo motor, driving the screw nut and the piston rod to move up and down, thereby realizing the suction and discharge of liquid in the piston cylinder, and the lifting and lowering guidance of the piston rod is realized through two guide blocks, which simplifies the internal structure, saves the product area to the maximum extent, and ensures the movement range of the piston rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the three-dimensional structure of the pipetting pump module of the present invention;

[0013] Figure 2 This is a schematic diagram of the internal structure of the pipetting pump module of the present invention. DETAILED DESCRIPTION

[0014] The following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the scope of protection of the present invention. The directional terms mentioned in the present invention, such as "up", "down",

[0015] The terms "front", "back", "left", "right", "top", "bottom", etc. are merely directions in reference to the accompanying drawings. Therefore, the directional terms used are for explaining and understanding the present invention, and are not intended to limit the present invention.

[0016] like Figure 1 The pipette pump module shown includes a shell 1, a servo motor 2 arranged at the top of the shell 1, a suction tip ejection sleeve 3 arranged at the bottom of the shell 1, and a drive assembly arranged in the shell 1 and connected to the servo motor 2, wherein the shell 1 is a thin plate-shaped rectangular structure.

[0017] Specifically, combined Figure 2As shown, the drive assembly includes a ball screw 5, a screw nut 6, a piston rod 10 and a piston cylinder 11. The top of the ball screw 5 is connected to the servo motor 2 through a coupling 4. The ball screw 5 is perpendicular to the horizontal plane. The screw nut 6 is rotatably connected to the ball screw 5. An origin sensor baffle 8 is fixed on the screw nut 6. An upper sensor 9 that can sense the origin sensor baffle 8 is provided in the housing 1. The top and bottom ends of the screw nut 6 are respectively fixed with guide blocks 7 by screws. One end of the guide block 7 is sleeved on the outside of the ball screw 5. The piston cylinder 11 is fixed to the bottom end of the housing 1 and is sleeved in the suction head sleeve 3. An air pressure sensor 16 that can sense the air pressure in the piston cylinder 11 is provided in the housing 1. The piston rod 10 is parallel to the ball screw 5. The top of the piston rod 10 is fixed to the bottom end of the screw nut 6, and the bottom end of the piston rod 10 is inserted into the piston cylinder 11. The inner wall of the piston cylinder 11 is dynamically sealed with the piston rod 10 through a sealing ring. The bottom end of the piston rod 10 is sleeved with a slider 12, and the slider 12 can slide up and down along the piston rod 10. The slider 12 is fixed to the top of the suction head withdrawal sleeve 3 through a connecting rod 17. A spring 13 is provided on the outer sleeve of the connecting rod 17. The top of the suction head withdrawal sleeve 3 is elastically connected to the housing 1 through the spring 13. A suction head in-position detection baffle 14 is fixed on the slider 12, and a lower sensor 15 that can sense the suction head in-position detection baffle 14 is provided in the housing 1. A circuit board is also installed in the housing 1, and the circuit board is electrically connected to the upper sensor 9, the lower sensor 15, and the air pressure sensor 16.

[0018] During use, the servo motor 2 drives the ball screw 5 to rotate, and the screw nut 6 moves up and down along the ball screw 5, thereby driving the piston rod 10 to move up and down along the piston cylinder 11, so that negative pressure or positive pressure is generated in the piston cylinder 11, thereby achieving the absorption or discharge of reagents or samples.

[0019] In addition, in the description of the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "set," and "provided with" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0020] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the concept of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A pipette pump module comprising a housing, a tip ejection sleeve disposed at both ends of the housing, a servo motor, and a drive assembly disposed within the housing and connected to the servo motor, characterized in that: The driving assembly includes a ball screw, a screw nut, a piston rod and a piston cylinder. The ball screw is connected to a servo motor, and the ball screw is perpendicular to the horizontal plane. The screw nut is rotatably connected to the ball screw. Guide blocks are respectively fixed at the top and bottom ends of the screw nut. One end of the guide block is sleeved outside the ball screw. The piston cylinder is fixed to the bottom end of the shell and sleeved inside the suction head sleeve. The piston rod is parallel to the ball screw, the top end of the piston rod is fixed to the screw nut, and the bottom end of the piston rod is inserted into the piston cylinder. The servo motor can drive the ball screw to rotate, thereby driving the screw nut and the piston rod to move up and down, thereby realizing the suction and discharge of liquid in the piston cylinder.

2. The pipetting pump module according to claim 1, characterized in that: An origin sensor baffle is fixed on the lead screw nut, and an upper sensor capable of sensing the origin sensor baffle is arranged in the housing.

3. The pipetting pump module according to claim 1, characterized in that: The bottom end of the piston rod is sleeved with a slider, which can slide up and down along the piston rod. The slider is fixed to the suction head ejection sleeve through a connecting rod, and the top end of the suction head ejection sleeve is elastically connected to the housing through a spring.

4. The pipetting pump module according to claim 3, characterized in that: A suction head in-position detection baffle is fixed on the slider, and a lower sensor capable of sensing the suction head in-position detection baffle is arranged in the shell.

5. The liquid transfer pump module according to claim 1, characterized in that: An air pressure sensor capable of sensing the air pressure in the piston cylinder is arranged in the shell.

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