Pipettor for food toxicology detection

Abstract

The utility model discloses a pipettor for food toxicology detection, which comprises a pipette with a built-in piston, the piston is connected with an operating rod extending out of the top end of the pipette, and the lower end of the pipette is a sharp opening; the pipette is provided with a cover plate corresponding to the sharp opening, the position of the cover plate relative to the sharp opening is controlled through an adjusting mechanism, and two convertible states of cover plate opening and cover plate closing are formed; when the cover plate is opened, the cover plate is far away from the sharp opening, so that the sharp opening freely contacts the outside; when the cover plate is in a closed state, the cover plate is close to the sharp opening so as to cover and seal the sharp opening. According to the utility model, the pipette is provided with the cover plate capable of covering and sealing the sharp opening, so that bacteria in the air can be prevented from entering the sample liquid from the sharp opening to influence the toxicology, and the accuracy of food detection is improved.

Description

Technical Field

[0001] This utility model belongs to the field of food testing technology, and in particular relates to a pipette used for food toxicology testing. Background Technology

[0002] In food toxicology testing, pipettes are essential laboratory equipment. When the prepared sample solution is pipetted, the pipette containing the sample solution is placed on a pipette rack during the pipetting interval for subsequent use. During this period, the tip of the pipette is open, and bacteria from the outside air can easily enter through the tip and mix into the sample solution, resulting in the presence of irrelevant bacteria in subsequent drops and inaccurate food toxicology test results. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, this utility model provides a pipette for food toxicology detection. By equipping the pipette with a cover plate that can cover and seal the tip, it can prevent airborne bacteria from entering the sample liquid through the tip and affecting the toxicity, thereby improving the accuracy of food toxicology detection.

[0004] Technical solution: To achieve the above objectives, this utility model provides a pipette for food toxicology testing, comprising a pipette with a built-in piston, the piston being connected to an operating rod extending from the top of the pipette, and the lower end of the pipette being a pointed tip.

[0005] Its characteristic is that the pipette is equipped with a cover plate corresponding to the tip, and the position of the cover plate relative to the tip plate is controlled by an adjustment mechanism to form two convertible states: the cover plate is open and the cover plate is closed.

[0006] With the cover plate open, the cover plate is away from the pointed opening, allowing the pointed opening to freely contact the outside world;

[0007] With the cover closed, the cover is positioned close to the pointed opening to cover and seal it.

[0008] Furthermore, the adjustment mechanism comprises a damping mounting base and a rotating rod. The rotating rod is parallel to the axis of the pipette and is connected to the cover plate through a damping hole in the damping mounting base. The rotating rod and the damping mounting base are damped and connected in both the axial and circumferential directions. By rotating the rotating rod horizontally and pushing and pulling it vertically, the position of the cover plate relative to the tip can be adjusted to control the opening and closing state of the cover plate.

[0009] Furthermore, the damping mounting base includes a base, a rigid sleeve coaxially fixed in a seat hole in the base, and an elastic ring circumferentially laid in the rigid sleeve; the damping connection between the rotating rod and the damping mounting base is provided by the elasticity of the elastic ring.

[0010] Furthermore, the side of the cover plate corresponding to the pointed opening is a sterile cover surface made of sterile paper or sterile film.

[0011] Furthermore, the rotating rod is provided with a hand-held expansion portion.

[0012] Furthermore, the top of the pipette is fitted with a top cap having a pressure balance hole, the operating rod slides through the top cap, and the operating rod is equipped with a pressing handle.

[0013] Beneficial effects: This utility model equips the pipette with a cover plate that can cover and seal the tip. When the pipette is placed on the pipette rack, the tip can be sealed by the cover plate to prevent bacteria in the air from entering the sample liquid through the tip and affecting the toxicity, thereby improving the accuracy and reliability of food testing. The cover plate can be opened when it is necessary to continue the dispensing operation, making the operation more convenient. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention with the cover plate open.

[0015] Figure 2 This is a schematic diagram of the overall structure of the present invention in the closed state of the cover plate;

[0016] Figure 3 This is a half-sectional view of the present invention with the cover plate closed. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] like Figure 1 , Figure 2 as well as Figure 3As shown, a pipette for food toxicology testing includes a pipette 1 with a built-in piston 2. The piston 2 is connected to an operating rod 3 extending from the top of the pipette 1. The lower end of the pipette 1 is a pointed tip 4. The outer periphery of the pipette 1 near the top is wrapped with a grip anti-slip pad 13, and the surface of the pipette 1 is provided with volume markings 14. The pipette 1 is equipped with a cover plate 6 corresponding to the pointed tip 4. The position of the cover plate 6 relative to the pointed tip 4 is controlled by an adjustment mechanism 5, forming two convertible states: open and closed. In the open state, the cover plate 6 is away from the pointed tip 4, allowing the pointed tip 4 to freely contact the outside. In the closed state, the cover plate 6 is close to the pointed tip 4 to cover and close it. Pipettes are essential tools in food toxicology testing, used for sample dispensing, sample transfer, and other stages. During the dispensing or pipetting intervals, external bacteria can easily enter the sample solution through the open tip 4, affecting its toxicity and leading to inaccurate subsequent toxicology tests. Therefore, this invention equips the pipette 1 with a cover plate 6 that can cover and seal the tip 4. During the pipetting interval when the pipette is placed on the pipette rack, the cover plate 6 can be used to seal the tip 4, preventing airborne bacteria from entering the sample solution through the tip 4 and affecting its toxicity, thereby improving the accuracy and reliability of food testing. When it is necessary to continue dispensing, the cover plate 6 can be opened, making the operation more convenient.

[0019] like Figure 1 and Figure 2 As shown, the adjustment mechanism 5 comprises a damping mounting base 7 and a rotating rod 8. The rotating rod 8 is parallel to the axis of the pipette 1 and is connected to the cover plate 6 through a damping hole 70 in the damping mounting base 7. The rotating rod 8 and the damping mounting base 7 are damped and movable in both the axial and circumferential directions. By rotating the rotating rod 8 horizontally and pushing and pulling it vertically, the position of the cover plate 6 relative to the tip 4 can be adjusted to control the opening and closing state of the cover plate 6. The rotating rod 8 is provided with a hand-held expansion part 9. By operating the hand-held expansion part 9, the rotating rod 8 can be rotated and pushed and pulled. Based on the damping effect, the rotating rod 8 can be stopped at the desired position, that is, the desired position to suspend the cover plate 6. The operation of opening the cover plate 6 is as follows: by pushing the rotating rod 8 down with the hand-held expansion part 9, the cover plate 6 moves down and away from the tip 4. Then, rotating it causes the cover plate 6 to deviate from the tip 4. Finally, pulling the rotating rod 8 up causes the cover plate 6 to move up. The operation of closing the cover plate 6 is as follows: by holding the expansion part 9 and pushing the rotating rod 8 down, the cover plate 6 is moved down to a height lower than the tip 4. Then, it is rotated to move the cover plate 6 below the tip 4. Finally, the rotating rod 8 is pulled up to move the cover plate 6 up to cover the tip 4.

[0020] like Figure 3As shown, the damping mounting base 7 includes a base 71, a rigid sleeve 72 coaxially fixed in the seat hole of the base 71, and an elastic ring 73 circumferentially laid in the rigid sleeve 72; the base 71 is connected to the side of the pipette 1, and the rigid sleeve 72 is fixedly installed to the base 71 by screws. The damping connection between the rotating rod 8 and the damping mounting base 7 is provided by the elasticity of the elastic ring 73, which can be made of elastic rubber.

[0021] To further ensure sterility and improve testing safety, in this invention, the side of the cover plate 6 that covers the tip 4 is a sterile cover surface 60 made of sterile paper or sterile film, and the sterile paper or sterile film can be replaced.

[0022] The top end of the pipette 1 is fitted with a top cover 11 having a pressure balance hole 10. The top cover 11 is threadedly connected to the pipette 1. The operating rod 3 slides through the top cover 11. The presence of the top cover 11 can improve the stability of the operating rod 3. The operating rod 3 is also equipped with a pressing handle 12.

[0023] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A pipette for food toxicology testing, comprising a pipette (1) with a built-in piston (2), the piston (2) being connected to an operating rod (3) extending from the top of the pipette (1), and the lower end of the pipette (1) being a pointed tip (4); Its features are: The pipette (1) is equipped with a cover plate (6) corresponding to the tip (4). The position of the cover plate (6) relative to the tip (4) is controlled by an adjustment mechanism (5) to form two convertible states: the cover plate is open and the cover plate is closed. With the cover plate open, the cover plate (6) is away from the pointed opening (4), allowing the pointed opening (4) to freely contact the outside world; With the cover closed, the cover (6) is close to the tip (4) to cover and close the tip (4).

2. The pipette for food toxicology detection according to claim 1, characterized in that: The adjustment mechanism (5) consists of a damping mounting base (7) and a rotating rod (8). The rotating rod (8) is parallel to the axis of the pipette (1) and is connected to the cover plate (6) through the damping hole (70) in the damping mounting base (7). The rotating rod (8) and the damping mounting base (7) are damped and connected in both the axial and circumferential directions. By rotating the rotating rod (8) horizontally and pushing and pulling it vertically, the position of the cover plate (6) relative to the tip (4) can be adjusted to control the opening and closing state of the cover plate (6).

3. A pipette for food toxicology detection according to claim 2, characterized in that: The damping mounting base (7) includes a base (71), a rigid sleeve (72) coaxially fixed in the seat hole of the base (71), and an elastic ring (73) circumferentially laid in the rigid sleeve (72); the damping connection between the rotating rod (8) and the damping mounting base (7) is provided by the elasticity of the elastic ring (73).

4. A pipette for food toxicology detection according to claim 2, characterized in that: The side of the cover plate (6) that covers the pointed opening (4) is a sterile cover surface (60) made of sterile paper or sterile film.

5. A pipette for food toxicology detection according to claim 2, characterized in that: The rotating rod (8) is provided with a hand-held expansion part (9).

6. A pipette for food toxicology detection according to claim 2, characterized in that: The top of the pipette (1) is fitted with a top cover (11) having a pressure balance hole (10), and the operating rod (3) slides through the top cover (11) and is provided with a pressing handle (12) on the operating rod (3).

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