Pipetting device for chemical quality inspection

Abstract

The utility model discloses a pipetting device for chemical quality inspection, which comprises a barrel, a liquid inlet pipe arranged at the bottom of the barrel, a piston slidably connected in the barrel, a push-pull rod fixedly arranged in the middle of the top of the piston, and a first threaded rod fixedly connected with a rotating motor on a mounting frame on one side of the top of the barrel. The push-pull rod penetrates through the top of the barrel and is in threaded connection with the first threaded rod, a threaded barrel is rotationally connected to a lug plate on the side wall of the top of the barrel, a second threaded rod is in threaded connection in the threaded barrel, an L-shaped plate at the top of the second threaded rod penetrates through and extends into the barrel and is fixedly provided with a limiting plate, and a scale pointer is fixedly connected to the bottom of the second threaded rod; scale marks are arranged on the outer wall of the cylinder body. According to the novel liquid suction device, the scale pointer is firstly moved to the needed scale position, the push-pull rod drives the piston to move upwards to make contact with the limiting plate through rotation of the first threaded rod, at the moment, the sucked liquid amount is the amount indicated by the scale pointer, one-hand operation is facilitated, quantitative moving and taking can be conducted, and use is more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical testing, in particular to a liquid transfer device for chemical quality testing. Background Art

[0002] Chemical quality inspection is an important part of ensuring product quality. Through sampling and testing of raw materials, process monitoring and inspection of final products, existing quality problems can be discovered and eliminated in a timely manner to ensure that the expected technical requirements and product standards are met.

[0003] A variety of reagents are needed for chemical quality inspection, and a pipette is needed to transfer the reagent solutions. The existing pipetting method is either through a device similar to a syringe, in which one hand holds the syringe and the other hand pulls and pushes the piston rod to extract or discharge the solution to complete the transfer of the solution, or the solution is quantitatively transferred through an ear bulb and a pipette. However, the top of the pipette needs to be sealed by the hand during the transfer process, which is prone to poor sealing and inaccurate quantification. Based on the above situation that it is not easy to operate with one hand and the quantification is inaccurate during the pipetting process, a pipette for chemical quality inspection is proposed. Utility Model Content

[0004] The utility model provides a liquid transfer device for chemical quality inspection, which is used to solve the problems mentioned in the above technical background that the existing liquid transfer device is not easy to operate with one hand and has inaccurate quantitative measurement during the liquid transfer process.

[0005] A pipetting device for chemical quality inspection comprises a cylinder, a liquid inlet tube is fixedly provided at the bottom of the cylinder, a piston is slidably connected to the cylinder, a push-pull rod is fixedly provided in the middle of the top of the piston, a mounting frame is fixedly provided on one side of the top of the cylinder, a rotating motor is fixedly provided on the top of the mounting frame, a first threaded rod is fixedly connected to the output end of the rotating motor, the push-pull rod passes through the top of the cylinder and is threadedly connected to the first threaded rod, an ear plate is fixedly connected to the side wall of the top of the cylinder, a threaded cylinder is rotatably connected to the ear plate, a second threaded rod is threadedly connected to the inner thread of the threaded cylinder, an L-shaped plate is fixedly connected to the top of the second threaded rod, the L-shaped plate extends through and into the cylinder and is fixedly provided with a limit plate, a scale indicator needle is fixedly connected to the bottom of the second threaded rod, and scale lines are provided on the outer wall of the cylinder on the side close to the scale indicator needle.

[0006] As a further solution of the utility model: sliding grooves are provided on the outer walls on both sides of the push-pull rod, and sliding blocks are fixedly connected to the inner walls on both sides of the middle of the top of the cylinder, and the sliding blocks are slidably connected in the sliding grooves.

[0007] As a further solution of the utility model: a thread groove is provided inside the push-pull rod, and the first threaded rod is threadedly connected in the thread groove.

[0008] As a further solution of the utility model: the vertical distance between the bottom of the limit plate and the needle tip of the scale indicator needle is consistent with the thickness of the piston.

[0009] As a further solution of the utility model: the end of the scale indicator needle is in contact with the outer wall of the cylinder and is slidably connected with the outer wall of the cylinder.

[0010] As a further solution of the utility model: the outer wall fixing sleeve of the threaded cylinder is provided with a knob.

[0011] As a further solution of the utility model: a handle is fixedly connected to the outer wall on one side above the cylinder, a control switch is fixedly connected to the top of the handle, and the control switch is electrically connected to the rotating motor through a wire.

[0012] The beneficial effects of the utility model are:

[0013] The utility model drives the threaded barrel to rotate by turning the knob, and the rotation of the threaded barrel drives the second threaded rod to move up and down, so that the limit plate and the scale indicator needle move up and down accordingly, and the scale indicator needle is moved to the required scale, and the rotating motor is started to drive the first threaded rod to rotate, so that the push-pull rod threadedly connected to the first threaded rod drives the piston to move upward until it moves to the top of the piston and contacts the limit plate. At this time, the amount of liquid absorbed in the barrel is the amount indicated by the scale indicator needle. The device is not only convenient for users to operate with one hand, but also can quantitatively transfer the required solution, and is more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0015] Figure 2 This is an enlarged schematic diagram of structure A of the utility model;

[0016] Figure 3 It is a schematic diagram of the overall appearance of the utility model.

[0017] In the figure: 1 cylinder, 2 liquid inlet pipe, 3 piston, 4 push-pull rod, 5 mounting frame, 6 rotating motor, 7 first threaded rod, 8 ear plate, 9 threaded cylinder, 10 second threaded rod, 11 L-shaped plate, 12 limit plate, 13 scale indicator needle, 14 scale line, 15 knob, 16 slide groove, 17 slider, 18 handle, 19 control switch. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0019] like Figure 1-3As shown, a pipetting device for chemical quality inspection comprises a cylinder 1, a liquid inlet tube 2 is fixedly provided at the bottom of the cylinder 1, a piston 3 is slidably connected in the cylinder 1, a push-pull rod 4 is fixedly provided in the middle of the top of the piston 3, a mounting bracket 5 is fixedly provided on one side of the top of the cylinder 1, a rotating motor 6 is fixedly provided on the top of the mounting bracket 5, a first threaded rod 7 is fixedly connected to the output end of the rotating motor 6, the push-pull rod 4 passes through the top of the cylinder 1 and is threadedly connected to the first threaded rod 7, an ear plate 8 is fixedly connected to the top side wall of the cylinder 1, a threaded cylinder 9 is rotatably connected to the ear plate 8, a second threaded rod 10 is threadedly connected to the inner side of the threaded cylinder 9, an L-shaped plate 11 is fixedly connected to the top of the second threaded rod 10, the L-shaped plate 11 extends through the cylinder 1 and is fixedly provided with a limit plate 12, a scale indicator needle 13 is fixedly connected to the bottom of the second threaded rod 10, and a scale line 14 is provided on the outer wall of the cylinder 1 close to the scale indicator needle 13.

[0020] The outer walls on both sides of the push-pull rod 4 are provided with sliding grooves 16, and the inner walls on both sides of the middle of the top of the cylinder 1 are fixedly connected with sliders 17, and the sliders 17 are slidably connected in the sliding grooves 16. The push-pull rod 4 is limited by the sliders 17 and the sliding grooves 16, so that the push-pull rod 4 only moves up and down in the vertical direction as the first threaded rod 7 rotates, and does not rotate.

[0021] A thread groove is formed inside the push-pull rod 4, and the first threaded rod 7 is threadedly connected in the thread groove.

[0022] The vertical distance between the bottom of the limit plate 12 and the tip of the scale indicator needle 13 is consistent with the thickness of the piston 3. When the piston 3 moves to the bottom of the limit plate 12, the bottom of the piston 3 is just level with the tip of the scale indicator needle 13. At this time, the scale indicated by the scale indicator needle 13 is the amount of the reagent solution absorbed into the cylinder 1.

[0023] The end of the scale indicator needle 13 is fitted with the outer wall of the cylinder 1 and is slidably connected to the outer wall of the cylinder 1, so that the scale indicated by the scale indicator needle 13 can be observed more clearly, making the quantitative determination more accurate.

[0024] The outer wall of the threaded barrel 9 is fixedly sleeved with a knob 15 to facilitate the rotation of the threaded barrel 9 .

[0025] A handle 18 is fixedly connected to the outer wall on one side above the cylinder 1, and a finger groove is provided at the bottom of the handle 18 to facilitate hand-held picking of the device. A control switch 19 is fixedly connected to the top of the handle 18, and the control switch 19 is electrically connected to the rotating motor 6 through a wire. By arranging the control switch 19 in front of the top of the handle 18, it is convenient for the thumb to turn on and off the rotating motor 6 with the control switch 19.

[0026] When in use, first turn the knob 15 according to the amount of liquid to be transferred, so that the second threaded rod 10 threadedly connected to the threaded barrel 9 moves up and down, thereby driving the limit plates 1, 2 and the scale indicator needle 13 at the bottom of the L-shaped plate 11 to move up and down, so that the scale indicator needle 13 moves to the required specified position, and then start the rotating motor 6 to drive the first threaded rod 7 to rotate. Under the limiting action of the slider 17 and the slide groove 16, the first threaded rod 7 rotates so that the push-pull rod 4 threadedly connected to the first threaded rod 7 drives the piston 3 to move upward until it moves to the top of the piston 3 and contacts the limit plate 12. At this time, the amount of liquid absorbed in the cylinder 1 is the amount indicated by the scale indicator needle 13, which is convenient for the user's operation and can quantitatively transfer the required solution to avoid waste of solution caused by excessive transfer.

[0027] It should be noted that the fully described utility model may also have a variety of transformation and modification implementation schemes, and is not limited to the above specific embodiments. In short, the protection scope of the utility model should include those obvious changes or substitutions and modifications to those of ordinary skill in the art, and the attached claims shall prevail.

Claims

1. A liquid transfer device for chemical quality inspection, comprising a cylinder (1), a liquid inlet pipe (2) fixedly provided at the bottom of the cylinder (1), characterized in that: A piston (3) is slidably connected inside the cylinder (1), a push-pull rod (4) is fixedly provided in the middle of the top of the piston (3), a mounting frame (5) is fixedly provided on one side of the top of the cylinder (1), a rotating motor (6) is fixedly provided on the top of the mounting frame (5), a first threaded rod (7) is fixedly connected to the output end of the rotating motor (6), the push-pull rod (4) passes through the top of the cylinder (1) and is threadedly connected to the first threaded rod (7), and an ear plate (8) is fixedly connected to the side wall of the top of the cylinder (1) ), a threaded barrel (9) is rotatably connected to the ear plate (8), a second threaded rod (10) is internally threadedly connected to the threaded barrel (9), an L-shaped plate (11) is fixedly connected to the top of the second threaded rod (10), the L-shaped plate (11) extends through the barrel body (1) and is fixedly provided with a limit plate (12), a scale indicator needle (13) is fixedly connected to the bottom of the second threaded rod (10), and a scale line (14) is provided on the outer wall of the barrel body (1) on the side close to the scale indicator needle (13).

2. A liquid transfer device for chemical quality inspection according to claim 1, characterized in that: The outer walls on both sides of the push-pull rod (4) are provided with sliding grooves (16), and the inner walls on both sides of the middle of the top of the cylinder (1) are fixedly connected with sliding blocks (17), and the sliding blocks (17) are slidably connected in the sliding grooves (16).

3. A liquid transfer device for chemical quality inspection according to claim 1, characterized in that: A thread groove is provided inside the push-pull rod (4), and the first threaded rod (7) is threadedly connected in the thread groove.

4. A liquid transfer device for chemical quality inspection according to claim 1, characterized in that: The vertical distance between the bottom of the limiting plate (12) and the needle tip of the scale indicating needle (13) is consistent with the thickness of the piston (3).

5. A liquid transfer device for chemical quality inspection according to claim 1, characterized in that: The end of the scale indicating needle (13) is in contact with the outer wall of the cylinder (1) and is slidably connected to the outer wall of the cylinder (1).

6. A liquid transfer device for chemical quality inspection according to claim 1, characterized in that: The outer wall of the threaded cylinder (9) is fixedly sleeved with a knob (15).

7. A liquid transfer device for chemical quality inspection according to claim 1, characterized in that: A handle (18) is fixedly connected to an outer wall on one side above the cylinder (1), and a control switch (19) is fixedly connected to the top of the handle (18). The control switch (19) is electrically connected to the rotating motor (6) via a wire.

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