Medicinal detection pipetting device

Abstract

The utility model discloses a medicinal detection pipetting device, and relates to the field of pipetting devices, the medicinal detection pipetting device comprises a pipetting cylinder, an assembling mechanism is arranged below the pipetting cylinder, the assembling mechanism comprises a pipette, an air inlet hole is formed in the outer wall of the pipette, the air inlet hole is of a conical structure, an exhaust plate is fixedly mounted in the air inlet hole, and the exhaust plate is fixedly connected with the pipette. The pipette is fixedly sleeved with an air bag, the air bag is communicated with an air inlet hole, an air exhaust hole is formed in the outer wall of the air bag, a rubber ball is arranged in the air inlet hole, and the rubber ball is movably installed on the side, away from the air bag, of the air exhaust plate. The outer wall of the air bag is tightly attached to the inner wall of the pipette head, so that the pipette head can be quickly mounted, and the problems that the assembly is not tight enough, the pipette head is easy to fall off from the pipette, and the volume of sucked liquid is different from a preset value are solved.

Description

Technical Field

[0001] The utility model relates to the field of liquid transfer devices, in particular to a liquid transfer device for pharmaceutical detection. Background Art

[0002] A pipetting device, also called a pipette, is an operating instrument often used in pharmaceutical testing, biological testing, and chemical testing.

[0003] When assembling the gun tip of the existing pipette device, the pipette is generally squeezed into the gun tip. This installation method is not tight enough, and the gun tip is easy to fall off the pipette, which not only affects the experimental efficiency, but also may cause the risk of liquid splashing. In addition, the insufficient sealing between the gun tip and the pipette will cause the loss of suction, resulting in a difference between the actual volume of liquid sucked and the preset value, affecting the accuracy and reliability of the experiment.

[0004] Therefore, it is necessary to propose a pharmaceutical detection pipetting device to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a liquid transfer device for pharmaceutical detection, so as to solve the problem that when the liquid transfer device is assembled with a gun head, a pipette and a gun head are not assembled tightly enough.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pharmaceutical detection pipetting device, comprising a pipette, an assembly mechanism is arranged below the pipette, the assembly mechanism comprises a pipette, an air inlet hole is opened on the outer wall of the pipette, the air inlet hole is in a conical structure, an exhaust plate is fixedly installed inside the air inlet hole, an air bag is fixedly sleeved on the pipette, the air bag is connected with the air inlet hole, an exhaust hole is opened on the outer wall of the air bag, a rubber ball is arranged in the air inlet hole, and the rubber ball is movably installed on the side of the exhaust plate away from the air bag.

[0007] Preferably, a plurality of air inlet holes are provided, and the plurality of air inlet holes are distributed in a circular shape on the pipette.

[0008] Preferably, a connecting block is fixedly mounted on the outer wall of the pipette, a connecting rod is movably penetrated through the connecting block, a push ring is fixedly mounted on one end of the connecting rod, and the push ring is movably sleeved on the pipette.

[0009] Preferably, a sliding groove is provided inside the connecting block, a common spring is arranged in the sliding groove, one end of the common spring is fixedly connected in the sliding groove, the other end of the common spring is fixedly connected to a limiting plate, the limiting plate is fixedly sleeved on the connecting rod, and the limiting plate is slidably connected in the sliding groove.

[0010] Preferably, a pipette tip is fixedly mounted on the bottom of the pipette tube, and the pipette is fixedly mounted on the pipette tip.

[0011] Preferably, a sealing cover is fixedly mounted on the top of the pipette cylinder, a piston rod is movably penetrated through the sealing cover, a sealing piston is fixedly mounted on the bottom of the piston rod, and the sealing piston is slidably connected in the pipette cylinder.

[0012] Preferably, a piston spring is fixedly connected to the bottom of the sealing piston, and one end of the piston spring away from the sealing piston is fixedly connected in the pipette cylinder.

[0013] Technical effects and advantages of the utility model:

[0014] The utility model achieves quick installation of the gun head by tightly fitting the outer wall of the air bag with the inner wall of the gun head, avoiding the problem that the gun head is easily detached from the pipette due to insufficient tight assembly, and the volume of the sucked liquid is different from the preset value;

[0015] The utility model can also blow away dust on the inner wall of the gun head when the gas is discharged through the liquid transfer tube, thereby improving the accuracy and reliability of the experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the pharmaceutical testing liquid transfer device of the utility model.

[0017] Figure 2 This is a structural cross-sectional view of the pharmaceutical detection liquid transfer device of the utility model.

[0018] Figure 3 For this utility model Figure 2 A magnified view of the structure in the middle.

[0019] Figure 4 For this utility model Figure 2 Enlarged view of the structure at point B in the middle.

[0020] In the figure: 1. Pipette cylinder; 2. Connecting block; 3. Connecting rod; 4. Pipette; 5. Sealing cover; 6. Piston rod; 7. Push ring; 8. Sealing piston; 9. Piston spring; 10. Pipette tip; 11. Limiting plate; 12. Sliding groove; 13. Ordinary spring; 14. Air bag; 15. Air inlet; 16. Rubber ball; 17. Exhaust hole; 18. Exhaust plate. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] The utility model provides Figure 1-Figure 4 A pharmaceutical detection pipetting device shown in the figure includes a pipette cylinder 1, which is used to install a piston assembly. An assembly mechanism is arranged below the pipette cylinder 1, and the assembly mechanism includes a pipette 4. The pipette 4 is used to install a gun head. The liquid is sucked into the gun head through the piston assembly to achieve a pipetting operation. A pipette tip 10 is fixedly installed at the bottom of the pipette cylinder 1. The pipette tip 10 is used to install the pipette 4, and the pipette 4 is fixedly installed on the pipette tip 10.

[0023] It should be noted that the gun tip is a common component in the pipette, and the gun tip is a disposable consumable, which will not be described in detail here.

[0024] Furthermore, a sealing cover 5 is fixedly installed on the top of the pipette cylinder 1, and the sealing cover 5 is used to improve the sealing performance in the pipette cylinder 1. A piston rod 6 is movably penetrated on the sealing cover 5, and the piston rod 6 is used to push the sealing piston 8, so as to achieve the effect of suction and blowing. A sealing piston 8 is fixedly installed on the bottom of the piston rod 6, and the sealing piston 8 is slidably connected in the pipette cylinder 1. A piston spring 9 is fixedly connected to the bottom of the sealing piston 8, and the piston spring 9 is used to reset the sealing piston 8. One end of the piston spring 9 away from the sealing piston 8 is fixedly connected in the pipette cylinder 1.

[0025] During specific operation, the operator holds the pipette 1, inserts the pipette 4 into the gun head, presses the pipette 4 downward, so that the gun head is installed on the pipette 4. Further, the operator presses the piston rod 6 with the thumb, so that the sealing piston 8 slides downward and the piston spring 9 is compressed, thereby expelling the gas in the pipette 1.

[0026] After the liquid in the pipette 1 is discharged, the operator aims the gun tip at the liquid to be sucked, slowly releases the thumb, so that the piston spring 9 resets, and the piston spring 9 pushes the sealing piston 8 to slide upward, and the liquid is sucked into the gun tip, thereby realizing operations such as moving the sucked liquid.

[0027] Considering that the extrusion installation method of the gun tip is not tightly assembled, the gun tip is easy to fall off the pipette 4, which not only affects the experimental efficiency but also may cause the risk of liquid splashing. Therefore, an air bag 14 is fixedly sleeved on the pipette 4, and an air inlet hole 15 is opened on the outer wall of the pipette 4. The air inlet hole 15 is used to ensure that the gas in the pipette tube 1 enters the air bag 14. The air bag 14 is connected to the air inlet hole 15. There are multiple air inlet holes 15, and the multiple air inlet holes 15 are distributed in a circle on the pipette 4.

[0028] Furthermore, a rubber ball 16 is arranged in the air inlet hole 15. The air inlet hole 15 is designed to have a conical structure. The rubber ball 16 cooperates with the conical air inlet hole 15 to achieve the effect of one-way air intake of the air inlet hole 15. An exhaust plate 18 is fixedly installed inside the air inlet hole 15. The exhaust plate 18 is used to block the rubber ball 16 from entering the airbag 14 when the gas enters the airbag 14. The rubber ball 16 is movably installed on the side of the exhaust plate 18 away from the airbag 14. An exhaust hole 17 is opened on the outer wall of the airbag 14. The exhaust hole 17 is used to discharge the gas in the airbag 14.

[0029] It should be noted that when the gun head is installed, the exhaust hole 17 is in contact with the inner wall of the gun head. The airbag 14 expands, so that the diameter of the exhaust hole 17 becomes smaller, thereby reducing the loss of gas in the airbag 14.

[0030] During specific operation, when the pipette 1 discharges gas, the gas enters the airbag 14 through the air inlet 15, inflating the airbag 14. The airbag 14 expands, so that the outer wall of the airbag 14 fits tightly with the inner wall of the gun tip, the fitting area between the gun tip and the pipette 4 increases, and the sealing of the gun tip is improved, thereby realizing quick installation of the gun tip and avoiding the problem of insufficient assembly, the gun tip easily falling off the pipette 4, and the volume of the sucked liquid being different from the preset value.

[0031] At the same time, when the pipette 1 discharges gas, the dust on the inner wall of the gun head can also be blown away, thereby improving the accuracy and reliability of the experiment.

[0032] When the gun tip is sucking liquid, due to the suction force in the pipette 1 and the pressure in the air bag 14 , the rubber ball 16 will fit on the air inlet 15 , thereby preventing the gas in the air bag 14 from being lost.

[0033] Furthermore, a connecting block 2 is fixedly installed on the outer wall of the pipette tube 1, a connecting rod 3 is movably passed through the connecting block 2, a push ring 7 is fixedly installed on one end of the connecting rod 3, the push ring 7 is used to disassemble the gun head, and the push ring 7 is movably sleeved on the pipette 4.

[0034] A sliding groove 12 is provided inside the connecting block 2, and a common spring 13 is arranged in the sliding groove 12. The common spring 13 is used for resetting the push ring 7. One end of the common spring 13 is fixedly connected to the sliding groove 12, and the other end of the common spring 13 is fixedly connected to a limiting plate 11. The limiting plate 11 is used for limiting the distance between the push ring 7 and the gun head. The limiting plate 11 is fixedly sleeved on the connecting rod 3, and the limiting plate 11 is slidably connected in the sliding groove 12.

[0035] During operation, after the gun tip is used, the operator presses the connecting rod 3, so that the connecting rod 3 drives the limit plate 11 to slide downward, the common spring 13 is compressed, and the push ring 7 pushes the gun tip, so that the gun tip is removed from the pipette 4, thereby improving the safety when using the pipetting device.

Claims

1. A liquid transfer device for pharmaceutical testing, comprising a liquid transfer cartridge (1), characterized in that: An assembly mechanism is provided below the pipette tube (1), the assembly mechanism comprising a pipette (4), an air inlet hole (15) is provided on the outer wall of the pipette (4), the air inlet hole (15) is in a conical structure, an exhaust plate (18) is fixedly mounted inside the air inlet hole (15), an air bag (14) is fixedly sleeved on the pipette (4), the air bag (14) is in communication with the air inlet hole (15), an exhaust hole (17) is provided on the outer wall of the air bag (14), a rubber ball (16) is arranged inside the air inlet hole (15), and the rubber ball (16) is movably mounted on a side of the exhaust plate (18) away from the air bag (14).

2. A pharmaceutical detection liquid transfer device according to claim 1, characterized in that: A plurality of air inlet holes (15) are provided, and the plurality of air inlet holes (15) are distributed in a circular pattern on the pipette (4).

3. A liquid transfer device for pharmaceutical detection according to claim 1, characterized in that: A connecting block (2) is fixedly mounted on the outer wall of the pipette tube (1), a connecting rod (3) is movably penetrated through the connecting block (2), a push ring (7) is fixedly mounted on one end of the connecting rod (3), and the push ring (7) is movably sleeved on the pipette (4).

4. A liquid transfer device for pharmaceutical detection according to claim 3, characterized in that: A sliding groove (12) is provided inside the connecting block (2), a common spring (13) is arranged in the sliding groove (12), one end of the common spring (13) is fixedly connected to the sliding groove (12), and the other end of the common spring (13) is fixedly connected to a limit plate (11), the limit plate (11) is fixedly sleeved on the connecting rod (3), and the limit plate (11) is slidably connected to the sliding groove (12).

5. A liquid transfer device for pharmaceutical detection according to claim 1, characterized in that: A pipette tip (10) is fixedly mounted on the bottom of the pipette cylinder (1), and the pipette (4) is fixedly mounted on the pipette tip (10).

6. A pharmaceutical detection liquid transfer device according to claim 1, characterized in that: A sealing cover (5) is fixedly mounted on the top of the pipette cylinder (1), a piston rod (6) is movably inserted into the sealing cover (5), a sealing piston (8) is fixedly mounted on the bottom of the piston rod (6), and the sealing piston (8) is slidably connected in the pipette cylinder (1).

7. A liquid transfer device for pharmaceutical detection according to claim 6, characterized in that: The bottom of the sealing piston (8) is fixedly connected to a piston spring (9), and one end of the piston spring (9) away from the sealing piston (8) is fixedly connected to the pipette cylinder (1).

Images