Stepping type pipette

Abstract

The utility model relates to a stepping type pipette which comprises a shell, a pipette head mechanism arranged at one end of the shell, a driving mechanism arranged in the shell and connected with the pipette head mechanism and a power mechanism arranged on the shell and connected with the driving mechanism, the power mechanism is a linear stepping motor, and the pipette head mechanism comprises a cavity and a pipette head. The driving mechanism comprises a lead screw, a guide rail, a lifting seat and a piston rod. According to the stepping type pipette, the installation structure in the shell is simplified, the whole pipette is convenient to install and maintain, the gun head is of a floating type structure, the gun head can make close contact with a test tube in the actual using process, the sealing performance is guaranteed, and therefore liquid splashing in the pipetting or spitting process is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of experimental instruments, in particular to a stepping type liquid transfer gun. Background Art

[0002] Sampling and pipetting instruments are widely used in biochemical, molecular, and cellular biology experiments. Their purpose is to sample and transfer a certain volume of liquid. The pipetting mechanism is one of their core mechanisms, used to extract, transport, and transfer liquids within a standard container.

[0003] In order to achieve liquid aspiration and dispensing at the tip of the existing pipette, the internal driving structure is relatively complex. In addition, the tip of this type of pipette is generally fixed, and during actual use, the tip cannot be in close contact with the test tube, resulting in liquid splashing during pipetting or dispensing, polluting the environment. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a step-by-step pipette gun which has a simple structure, is easy to assemble, and can ensure sealing during pipetting or dispensing.

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

[0006] A stepping pipette gun comprises a housing, a gun head mechanism disposed at one end of the housing, a driving mechanism disposed in the housing and connected to the gun head mechanism, and a power mechanism disposed on the housing and connected to the driving mechanism;

[0007] The power mechanism is a linear stepping motor, and the linear stepping motor is fixed to the top of the housing;

[0008] The gun head mechanism includes a cavity and a gun head, the cavity is fixed to the bottom end of the shell, the gun head is elastically connected to the bottom end of the cavity, and the gun head is connected to the inner cavity of the cavity;

[0009] The driving mechanism includes a screw, a guide rail, a lifting seat and a piston rod. The guide rail is fixed to the inner wall of the shell and is perpendicular to the horizontal plane. The screw is connected to the linear stepping motor and is parallel to the guide rail. The lifting seat is threadedly connected to the screw. One end of the lifting seat is slidably connected to the guide rail. The top end of the piston rod is fixed to the lifting seat, and the bottom end of the piston rod is inserted into the cavity. The linear stepping motor can drive the lifting seat to move up and down along the screw, thereby driving the piston to move along the cavity to realize liquid suction and discharge of the gun head.

[0010] In order to facilitate control, a circuit board is fixed in the shell, and the circuit board is arranged opposite to the guide rail.

[0011] In order to accurately determine whether the gun head is raised or lowered into place, the gun head mechanism also includes an elastic telescopic rod, which is a group. The bottom end of the elastic telescopic rod is fixed to the gun head, and the bottom end of the elastic telescopic rod is elastically connected to the cavity through a first spring. The top end of the elastic telescopic rod passes through the top end of the cavity and is elastically connected to the cavity through a second spring. A floating plate is fixed to the top end of the elastic telescopic rod, and a photoelectric switch that can sense the position of the floating plate is fixed on the circuit board.

[0012] In order to facilitate disassembly and assembly, the shell is rectangular and includes a detachably connected cover shell, a cover plate and a top plate.

[0013] The beneficial effects of the present invention are as follows: the step-by-step pipette simplifies the installation structure inside the shell, facilitates the installation and maintenance of the entire pipette, and the gun head adopts a floating structure, which can ensure close contact between the gun head and the test tube during actual use, thereby ensuring sealing, thereby avoiding liquid splashing during pipetting or discharging. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the external structure of the step-by-step pipette of the present invention;

[0015] Figure 2 This is a schematic diagram of the internal structure of the stepping pipette of the present invention. DETAILED DESCRIPTION

[0016] 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",

[0017] 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.

[0018] like Figure 1 The stepping pipette shown includes a housing, a gun head mechanism disposed at one end of the housing, a driving mechanism disposed in the housing and connected to the gun head mechanism, and a power mechanism disposed on the housing and connected to the driving mechanism, wherein the housing is rectangular and includes a detachably connected cover 1, a cover plate 2, and a top plate 3; the power mechanism is a linear stepping motor 4, which is fixed to the top of the top plate 3 of the housing; the gun head mechanism includes a cavity 5 and a gun head 6, the cavity 5 is fixed to the bottom end of the housing, the gun head 6 is elastically connected to the bottom end of the cavity 5, and the gun head 6 is connected to the inner cavity of the cavity 5;

[0019] Specifically, combined Figure 2As shown, the driving mechanism includes a screw 7, a guide rail 8, a lifting seat 9 and a piston rod 10. The guide rail 8 is fixed to the inner wall of the cover plate 2 of the shell, and the guide rail 8 is perpendicular to the horizontal plane. The top of the screw 7 is connected to the linear stepping motor 4, and the bottom end is rotatably connected to the support plate at the bottom end of the shell. The screw 7 is parallel to the guide rail 8. The lifting seat 9 is threadedly connected to the screw 7. One end of the lifting seat 9 is slidably connected to the guide rail 8 through a slider. The top of the piston rod 10 is fixed to the lifting seat 9, and the bottom end of the piston rod 10 is inserted into the cavity 5. In addition, the shell is fixed There is a circuit board 11, which is arranged opposite to the guide rail 8. The gun head mechanism also includes an elastic telescopic rod 14, which is a group. The bottom end of the elastic telescopic rod 14 is fixed to the gun head 6, and the bottom end of the elastic telescopic rod 14 is elastically connected to the cavity 5 through a first spring 16. The top of the elastic telescopic rod 14 passes through the top of the cavity 5 and is elastically connected to the cavity 5 through a second spring 15. A floating plate 13 is fixed to the top of the elastic telescopic rod 14, and a photoelectric switch 12 that can sense the position of the floating plate 13 is fixed on the circuit board 11.

[0020] When in use, the stepping pipette is moved to the top of the test tube by the manipulator, and the manipulator drives the stepping pipette to descend, so that the gun head 6 gradually extends into the test tube, and the spring contracts until the photoelectric switch 12 senses the position of the floating plate 13. The manipulator stops moving, and the linear stepper motor 4 drives the screw 7 to rotate, driving the lifting seat 9 to move up and down along the guide rail 8. The lifting seat 9 drives the piston rod 10 to descend to realize the discharge of liquid by the gun head 6, and the lifting seat 9 drives the piston rod 10 to rise to realize the aspiration of liquid by the gun head 6.

[0021] 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.

[0022] 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 stepping pipette, comprising a housing, a tip mechanism disposed at one end of the housing, a drive mechanism disposed within the housing and connected to the tip mechanism, and a power mechanism disposed on the housing and connected to the drive mechanism, characterized in that: The power mechanism is a linear stepping motor, and the linear stepping motor is fixed to the top of the housing; The gun head mechanism includes a cavity and a gun head, the cavity is fixed to the bottom end of the shell, the gun head is elastically connected to the bottom end of the cavity, and the gun head is connected to the inner cavity of the cavity; The driving mechanism includes a screw, a guide rail, a lifting seat and a piston rod. The guide rail is fixed to the inner wall of the shell and is perpendicular to the horizontal plane. The screw is connected to the linear stepping motor and is parallel to the guide rail. The lifting seat is threadedly connected to the screw. One end of the lifting seat is slidably connected to the guide rail. The top end of the piston rod is fixed to the lifting seat, and the bottom end of the piston rod is inserted into the cavity. The linear stepping motor can drive the lifting seat to move up and down along the screw, thereby driving the piston rod to move along the cavity to realize liquid suction and discharge of the gun head.

2. The step-by-step pipette according to claim 1, characterized in that: A circuit board is fixed in the shell, and the circuit board is arranged opposite to the guide rail.

3. The step-by-step pipette according to claim 2, characterized in that: The gun head mechanism also includes an elastic telescopic rod, which is a group of elastic telescopic rods. The bottom end of the elastic telescopic rod is fixed to the gun head, and the bottom end of the elastic telescopic rod is elastically connected to the cavity through a first spring. The top end of the elastic telescopic rod passes through the top end of the cavity and is elastically connected to the cavity through a second spring. A floating plate is fixed to the top end of the elastic telescopic rod, and a photoelectric switch that can sense the position of the floating plate is fixed to the circuit board.

4. The step-by-step pipette according to any one of claims 1 to 3, characterized in that: The shell is rectangular and includes a detachably connected cover shell, a cover plate and a top plate.

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