Two-channel spacing-adjustable pipetting module

Abstract

The utility model relates to a two-channel spacing-adjustable pipetting module, which comprises two groups of spacing-adjustable pipetting modules, each spacing-adjustable pipetting module comprises a lifting module and a pipetting module, each lifting module comprises a shell, a stepping motor, a lifting screw rod, a lifting seat, a lifting guide rail and a lifting slide block, the pipetting module comprises a shell, a direct-current brush motor, a pipetting screw rod, a fixed seat, a pipetting guide rail, a piston rod, a cavity and a gun head. According to the double-channel spacing-adjustable pipetting module, stepping motors of the lifting module are arranged in a staggered mode, so that the lifting module is small in overall size and compact in structure, the requirement for small spacing is met, meanwhile, a Z-axis part can be generally used for most parts, and the pipetting module is lifted by adopting a direct-current brush motor to be matched with a lead screw and a piston rod; the piston rod and the guide rail are distributed on two sides of the lead screw, stress is more uniform, and the structure is more stable.

Description

Technical Field

[0001] The utility model relates to the technical field of experimental instruments, in particular to a dual-channel adjustable-distance pipetting module. 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] Existing pipetting modules are generally large in size, and the servo motor drives the piston rod to achieve lifting and lowering through the ball screw and screw nut. Since a guide mechanism needs to be designed when the screw nut and piston rod are lifted and lowered, its internal structure is complex. In addition, in order to achieve the lifting and lowering of the pipette gun in the Z-axis direction, a larger servo motor will be used. The parallel arrangement of multiple servo motors will result in a larger overall thickness of the lifting module, occupying a larger space, and at the same time affecting the horizontal movement range of the pipetting module. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a dual-channel adjustable-spacing pipetting module with small size, compact structure, flexible and convenient adjustment, and a large moving range.

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

[0006] A dual-channel adjustable-spacing pipetting module comprises two groups of adjustable-spacing pipetting modules, the adjustable-spacing pipetting modules comprising a lifting module and a pipetting module, the lifting module comprising a housing, a stepping motor, a lifting screw, a lifting seat, a lifting guide rail and a lifting slider, the stepping motor being fixed to the top of the housing, and the two stepping motors of the two lifting modules being staggered, the lifting screw being arranged in the housing and connected to the stepping motor, the lifting guide rail being fixed to one side outside the housing, the lifting slider being slidably connected to the lifting guide rail, one end of the lifting seat being rotatably connected to the lifting screw, and the other end extending outside the housing and fixed to the lifting slider, the stepping motor being able to drive the lifting slider to move up and down along the lifting guide rail;

[0007] The pipetting module includes a shell, a DC brush motor, a pipetting screw, a fixing seat, a pipetting guide rail, a piston rod, a cavity and a gun tip. The DC brush motor is fixed to the top of the shell, the pipetting screw is arranged in the shell and connected to the DC brush motor, the pipetting guide rail is fixed in the shell, the pipetting guide rail is parallel to the pipetting screw, the fixing seat is threadedly connected to the pipetting screw, one end of the fixing seat is slidably connected to the pipetting guide rail, and the other end is fixed to the top of the piston rod, the cavity is fixed in the shell, the gun tip is fixed at the bottom end of the shell, the gun tip is connected to the inner cavity of the cavity, the bottom end of the piston rod is inserted into the inner cavity of the cavity, and the DC brush motor can drive the fixing seat to rise and fall along the pipetting guide rail, drive the piston rod to move up and down, and realize the suction or discharge of liquid by the gun tip.

[0008] In a preferred embodiment of the present invention, the shell is a rectangular thin sheet structure, the thickness of a single shell is less than the width of the stepper motor, and the total thickness of the two shells is greater than the width of the stepper motor.

[0009] In order to facilitate sensing whether the lifting seat is lifted into place, a sensing plate is fixed on the lifting seat, a circuit board is fixed in the shell, and a first photoelectric switch that can sense the sensing plate is provided on the circuit board.

[0010] In a preferred embodiment of the present invention, the housing is a rectangular sheet-shaped structure, and the thickness of the housing is greater than or equal to the diameter of the DC brushed motor.

[0011] In order to facilitate sensing whether the fixing base is raised or lowered into place, a sensing piece is integrally formed on one side of the fixing base, a control board is fixed in the shell, and a second photoelectric switch that can sense the sensing piece is provided on the control board.

[0012] The beneficial effects of the present invention are as follows: the dual-channel adjustable-spacing pipetting module adopts a staggered setting of the stepping motor of the lifting module, so that the overall volume of the lifting module is small and the structure is compact. While meeting the small spacing, the Z-axis part can use most of the common parts. The pipetting module adopts a DC brush motor in conjunction with a lead screw and a piston rod to achieve lifting. The piston rod and the guide rail are distributed on both sides of the lead screw, the force is more evenly distributed, and the structure is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the three-dimensional structure of the dual-channel adjustable spacing pipetting module of the present invention;

[0014] Figure 2 This is a schematic diagram of the internal structure of the dual-channel adjustable spacing pipetting module of the present invention. DETAILED DESCRIPTION

[0015] 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",

[0016] 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.

[0017] like Figure 1 The dual-channel adjustable-spacing pipetting module shown includes two groups of adjustable-spacing pipetting modules, wherein the adjustable-spacing pipetting module includes a lifting module 2 and a pipetting module 3. The two lifting modules 2 are arranged side by side, and their rear sides are fixed on the support plate 1. The two pipetting modules 3 are respectively slidably connected to the front sides of the two lifting modules 2.

[0018] Specifically, combined Figure 2 As shown, the lifting module includes a shell 201, a stepper motor 202, a lifting screw 203, a lifting seat 204, a lifting guide rail 206 and a lifting slider 205. The stepper motor 202 is fixed to the top of the shell 201. The shell 201 is a rectangular thin sheet structure. The thickness of a single shell 201 is less than the width of the stepper motor 202. The total thickness of the two shells 201 is greater than the width of the stepper motor 202. The two stepper motors 202 of the two lifting modules are staggered. The lifting screw 203 is set in the shell 201. The top of the lifting screw 203 is connected to the stepper motor 202, and the bottom of the lifting screw 203 is connected to the shell 20 1 is rotatably connected via a bearing, the lifting guide rail 206 is fixed to one side outside the housing 201, the lifting slider 205 is slidably connected to the lifting guide rail 206, one end of the lifting seat 204 is rotatably connected to the lifting screw 203, and the other end extends outside the housing 201 and is fixed to the lifting slider 205, a sensor plate 210 is fixed to the lifting seat 204, a circuit board 208 is fixed in the housing 201, and a first photoelectric switch 209 that can sense the sensor plate 210 is provided on the circuit board 208, and the stepping motor 202 can drive the lifting slider 205 to move up and down along the lifting guide rail 206;

[0019] Specifically, the pipetting module includes a housing 301, a DC brush motor 302, a pipetting screw 304, a fixing seat 307, a pipetting guide rail 305, a piston rod 306, a cavity 308 and a gun head 309. The rear side of the housing 301 is fixed to the lifting slider 205. The DC brush motor 302 is a cylindrical structure and is fixed to the top of the housing 301. The housing 301 is a rectangular thin sheet structure. The thickness of the housing 301 is greater than or equal to the diameter of the DC brush motor 302. The pipetting screw 304 is arranged in the housing 301 and is connected to the DC brush motor 302 through a coupling 303. The pipetting guide rail 305 is fixed in the housing 301. The pipetting guide rail 305 is parallel to the pipetting screw 304. The fixing seat 307 is threadedly connected to the pipetting screw 304. The fixing seat One end of 307 is slidably connected to the pipetting guide rail 305, and the other end is fixed to the top of the piston rod 306. A sensor sheet 311 is integrally formed on one side of the fixed seat 307. A control board is fixed in the shell 301, and a second photoelectric switch 310 that can sense the sensor sheet 311 is provided on the control board. The cavity 308 is fixed in the shell 301, and the gun head 309 is fixed at the bottom end of the shell 301. The gun head 309 is connected to the inner cavity of the cavity 308. The piston rod 306 and the pipetting guide rail 305 are respectively arranged on both sides of the pipetting screw 304, and the bottom end of the piston rod 306 is inserted into the inner cavity of the cavity 308. The DC brush motor 302 can drive the fixed seat 307 to rise and fall along the pipetting guide rail 305, drive the piston rod 306 to move up and down, and realize the suction or discharge of liquid by the gun head 309.

[0020] During use, the stepper motor 202 drives the lifting screw 203 to rotate, and the lifting seat 204 drives the lifting slider 205 to move up and down along the lifting guide rail 206, thereby realizing the up and down movement of the entire pipetting module; the DC brush motor 302 drives the pipetting screw 304 to rotate through the coupling 303, and 307 drives the piston rod to move up and down, realizing the suction or discharge of liquid by the gun head 309.

[0021] In order to put two 20mm thick pipetting modules together so that the spacing reaches 20mm, a stepper motor stagger is used, with front and back staggering to meet the 20mm spacing while the Z axis can use most parts; two 16mm thick pipetting modules are used, with independent control of the upper and lower Z axes, and the standard liquid aspiration capacity is 1000μl; for liquid level detection, the pipette has two detection methods: air pressure detection and capacitance detection. The pressure sensor detects the bottom liquid pressure and converts it to calculate the liquid level height. The bottom liquid pressure reference value is the atmospheric pressure or known air pressure connected to the top. Capacitance detection indirectly obtains the liquid level height information by measuring the electrical properties of the liquid in the container. It has the advantages of small size and simple implementation. The device has many advantages, but its disadvantage is that it is easily affected by different container materials and solution properties, and the detected liquid must be a polar liquid. This device is standardly equipped with two liquid level detection methods, which can detect the liquid level faster and more accurately. The DC brush motor is connected to the lead screw through a coupling, and the two ends of the lead screw are fixed with centripetal bearings to ensure that the lead screw is concentric with the motor shaft. On both sides of the lead screw are the piston rod and the guide rail, which plays a guiding role. The DC brush motor provides thrust to the piston rod through the fixed seat. Because the piston rod and the guide rail are distributed on both sides of the lead screw, the force is more evenly distributed and the structure is more stable. The aspiration and exhalation adopts a piston structure, which generates suction and discharge force by changing the volume in the cavity. The gun head is made into a slender shape, which can penetrate into the bottom of the test tube for better aspiration and exhalation.

[0022] 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.

[0023] 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 dual-channel adjustable-spacing pipetting module, comprising two sets of adjustable-spacing pipetting modules, each of which comprises a lifting module and a pipetting module, characterized in that: The lifting module includes a housing, a stepper motor, a lifting screw, a lifting seat, a lifting guide rail and a lifting slider. The stepper motor is fixed to the top of the housing, and the two stepper motors of the two lifting modules are staggered. The lifting screw is arranged in the housing and connected to the stepper motor. The lifting guide rail is fixed to one side outside the housing. The lifting slider is slidably connected to the lifting guide rail. The stepper motor drives the lifting screw to rotate, and the lifting seat drives the lifting slider to move up and down along the lifting guide rail. The pipetting module includes a shell, a DC brush motor, a pipetting screw, a fixing seat, a pipetting guide rail, a piston rod, a cavity and a gun tip. The shell is fixed to the lifting slider, the DC brush motor is fixed to the top of the shell, the pipetting screw is arranged in the shell and connected to the DC brush motor, the pipetting guide rail is fixed in the shell, the pipetting guide rail is parallel to the pipetting screw, the fixing seat is threadedly connected to the pipetting screw, one end of the fixing seat is slidably connected to the pipetting guide rail, and the other end is fixed to the top of the piston rod, the cavity is fixed in the shell, the gun tip is fixed at the bottom end of the shell, the gun tip is connected to the inner cavity of the cavity, the bottom end of the piston rod is inserted into the inner cavity of the cavity, and the DC brush motor can drive the fixing seat to rise and fall along the pipetting guide rail, drive the piston rod to move up and down, and realize the suction or discharge of liquid by the gun tip.

2. The dual-channel adjustable-distance pipetting module according to claim 1, characterized in that: The shell is a rectangular thin sheet structure, the thickness of a single shell is less than the width of the stepper motor, and the total thickness of the two shells is greater than the width of the stepper motor.

3. The dual-channel adjustable-distance pipetting module according to claim 1, characterized in that: A sensing plate is fixed on the lifting seat, a circuit board is fixed in the shell, and a first photoelectric switch capable of sensing the sensing plate is provided on the circuit board.

4. The dual-channel adjustable-distance pipetting module according to claim 1, characterized in that: The shell is a rectangular thin sheet structure, and the thickness of the shell is greater than or equal to the diameter of the DC brush motor.

5. The dual-channel adjustable-distance pipetting module according to claim 1, characterized in that: A sensing sheet is integrally formed on one side of the fixing seat, a control board is fixed in the shell, and a second photoelectric switch capable of sensing the sensing sheet is provided on the control board.

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