A pipetting device for microbiological testing

Abstract

The utility model relates to microorganism detection technical field, and disclose a kind of pipette device for microbiological examination, including shell and liquid storage pipe, shell lower end surface is equipped with mounting groove, liquid storage pipe includes buffer tube, buffer tube is set in mounting groove inside, buffer tube lower end is fixedly connected with dropper, shell upper end surface is equipped with mounting cavity;Further include: fixed mechanism, fixed mechanism is installed in shell lower end, and fixed mechanism is used to buffer tube fixed in mounting groove inside;Driving mechanism, driving mechanism is installed in mounting cavity inside.The utility model can drive a pair of slider to slide in reserved groove by rotating ring, slider is pushed and pulled by resistance bar stop rod, makes stop rod switch between " locking " and " looseness " position quickly, realizes the integral quick release of liquid storage pipe, need not to change different volume or material liquid storage component according to sample characteristic without the aid of tool, significantly reduce cross-contamination risk and improve inspection efficiency.

Description

Technical Field

[0001] This utility model relates to the field of microbial detection technology, and in particular to a pipetting device for microbial testing. Background Technology

[0002] Microbiological testing involves many fields such as food, medicine, industry, agriculture, environmental protection, and sports. Microorganisms, including bacteria, viruses, fungi, small protozoa, and microalgae, are tiny and include both beneficial and harmful species. Accurate sampling and quantitative analysis of these microorganisms rely on pipetting devices.

[0003] The most commonly used pipetting device is the integrated piston cylinder and piston rod syringe; in use, the piston rod is manually pulled to create a negative pressure inside the piston cylinder, thereby drawing the liquid to be tested into the cylinder for storage.

[0004] The aforementioned integrated syringe requires continuous manual maintenance of negative pressure during aspiration, which is cumbersome and labor-intensive. Furthermore, it cannot quickly replace liquid storage components of different volumes or materials, making it difficult to adapt to the testing needs of different microbial samples and affecting work efficiency and experimental accuracy. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a pipetting device for microbial testing, which solves the problems of cumbersome operation, high labor intensity, inability to quickly replace the liquid storage components, and difficulty in adapting to the diverse microbial sample testing needs.

[0006] This utility model provides a pipetting device for microbial testing, comprising a shell and a storage tube. The lower end face of the shell has a mounting groove. The storage tube includes a buffer tube disposed inside the mounting groove, and a dropper is fixedly connected to the lower end of the buffer tube. The upper end face of the shell has a mounting cavity. It also includes:

[0007] A fixing mechanism is installed at the lower end of the housing and is used to fix the buffer tube inside the mounting groove;

[0008] A drive mechanism is installed inside the mounting cavity and is used to drive the liquid storage tube to absorb liquid.

[0009] Preferably, the dropper has graduation lines on its side wall.

[0010] Preferably, the fixing mechanism includes a slider and a limiting rod. The left and right side walls of the housing are provided with reserved slots. A pair of sliders are provided and are slidably connected inside the reserved slots respectively. An arc-shaped groove is provided on the front end face of the slider. A pair of limiting rods are provided and are rotatably connected inside the reserved slots respectively. The upper end face of the limiting rod located at the lower end of the housing abuts against the lower end face of the buffer tube. A groove is provided on the upper end face of the limiting rod. A stop rod is fixedly connected inside the groove. The stop rod passes through the arc-shaped groove and is slidably connected thereto.

[0011] Preferably, both ends of the slider are fixedly connected with protrusions, and a first limiting groove is opened inside the reserved groove. The protrusions are located inside the first limiting groove and are slidably connected to it.

[0012] Preferably, the fixing mechanism further includes a fixing ring and a circular ring. The fixing ring is fixedly connected to the outer wall of the housing, and the circular ring is rotatably connected to the lower end of the fixing ring. The inner wall of the circular ring is provided with a threaded groove, and the end of the slider away from the axis of the housing abuts against and is threadedly connected to the inner wall of the circular ring.

[0013] Preferably, the driving mechanism includes a fixed plate and a pressing head. The fixed plate is fixedly connected to the bottom of the mounting cavity. An air pipe is fixedly connected to the lower end of the fixed plate, and the air pipe passes through and abuts against the buffer tube. A rubber cap is fixedly connected to the upper end of the fixed plate. The pressing head is slidably connected inside the mounting cavity. The lower end of the pressing head is fixedly connected to the upper end of the rubber cap. A spring is sleeved on the outer wall of the rubber cap. The upper end of the spring is fixedly connected to the lower end of the pressing head, and the lower end of the spring is fixedly connected to the upper end of the fixed plate. A second limiting groove is opened on the side wall of the pressing head. A limiting block is fixedly connected to the upper side of the mounting cavity. The limiting block is located inside the second limiting groove and is slidably connected to it.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model can synchronously drive a pair of sliders to slide in a reserved groove by rotating a ring. The sliders push and pull the limiting rod through the abutment rod, so that the limiting rod can quickly switch between the "locked" and "unlocked" positions, realizing the quick disassembly of the liquid storage tube. Liquid storage components of different volumes or materials can be replaced according to the characteristics of the sample without the aid of tools, which significantly reduces the risk of cross-contamination and improves the efficiency of testing.

[0016] 2. This utility model utilizes a negative pressure drive structure formed by a pressing head, a rubber cap, and an air tube. The rubber cap automatically rebounds under the action of a spring, continuously and stably generating a quantitative negative pressure. Combined with the graduation lines on the outer wall of the dropper, it achieves precise liquid aspiration and dispensing, avoiding the cumbersome operation and human error of traditional manual piston rod pulling, reducing labor intensity and improving experimental accuracy. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall main structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the main cross-sectional structure of the shell of this utility model;

[0019] Figure 3 This is an exploded view of the fixing mechanism of this utility model;

[0020] Figure 4 This utility model Figure 3 Enlarged structural diagram of section A.

[0021] Numbering on the map:

[0022] 1. Housing; 11. Mounting cavity; 111. Limiting block; 12. Mounting groove; 13. Reserved groove; 131. First limiting groove; 2. Liquid storage tube; 21. Dropper; 211. Scale line; 22. Buffer tube; 3. Fixing mechanism; 31. Slider; 311. Protrusion; 312. Arc groove; 32. Limiting rod; 321. Groove; 33. Abutment rod; 34. Fixing ring; 35. Circular ring; 4. Drive mechanism; 41. Fixing plate; 42. Air tube; 43. Rubber cap; 44. Spring; 45. Pressing head; 451. Second limiting groove. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] like Figure 1-4 As shown, this utility model has the following three specific embodiments.

[0025] Example 1: A pipette for microbial testing includes a housing 1 and a storage tube 2. The lower end face of the housing 1 has a mounting groove 12. The storage tube 2 includes a buffer tube 22, which is disposed inside the mounting groove 12. A dropper 21 is fixedly connected to the lower end of the buffer tube 22. The upper end face of the housing 1 has a mounting cavity 11. The device also includes:

[0026] Fixing mechanism 3 is installed at the lower end of housing 1 and is used to fix buffer tube 22 inside mounting groove 12;

[0027] Drive mechanism 4 is installed inside the mounting cavity 11 and is used to drive the liquid storage tube 2 to absorb liquid.

[0028] The dropper 21 has graduation lines 211 on its side wall.

[0029] In this embodiment, as Figures 1-2 As shown, first insert the liquid storage tube 2 into the mounting slot 12, then fix the buffer tube 22 in the liquid storage tube 2 into the housing 1 through the fixing mechanism 3 to complete the tool-free quick positioning; then insert the lower end of the dropper 21 into the liquid to be tested, and then use the drive mechanism 4 in conjunction with the scale line 211 to achieve quantitative sampling, and the drive mechanism 4 can complete the liquid discharge process. The whole operation can be completed with one hand.

[0030] Example 2: The difference from Example 1 is that this example discloses a fixing mechanism 3 for quickly fixing the liquid storage tube 2;

[0031] The fixing mechanism 3 includes a slider 31 and a limiting rod 32. The left and right side walls of the housing 1 are provided with reserved grooves 13. A pair of sliders 31 are provided and are slidably connected inside the reserved grooves 13 respectively. An arc-shaped groove 312 is provided on the front end face of the slider 31. A pair of limiting rods 32 are provided and are rotatably connected inside the reserved grooves 13 respectively. The upper end face of the limiting rod 32 located at the lower end of the housing 1 abuts against the lower end face of the buffer tube 22. A groove 321 is provided on the upper end face of the limiting rod 32. A push rod 33 is fixedly connected inside the groove 321. The push rod 33 passes through the arc-shaped groove 312 and is slidably connected to it.

[0032] Both ends of the slider 31 are fixedly connected with protrusions 311. The reserved groove 13 has a first limiting groove 131 inside. The protrusions 311 are located inside the first limiting groove 131 and are slidably connected to it.

[0033] The fixing mechanism 3 also includes a fixing ring 34 and a circular ring 35. The fixing ring 34 is fixedly connected to the outer wall of the housing 1, and the circular ring 35 is rotatably connected to the lower end of the fixing ring 34. The inner wall of the circular ring 35 is provided with a threaded groove. The end of the slider 31 away from the axis of the housing 1 abuts against the inner wall of the circular ring 35 and is threadedly connected to it.

[0034] In this embodiment, as Figures 3-4 As shown, when it is necessary to lock the liquid storage tube 2, rotate the ring 35 clockwise. The inner wall thread of the ring 35 pushes the sliders 31 on both sides to slide upward synchronously along the reserved groove 13. During the upward movement of the sliders 31, the arc groove 312 drives the abutment rod 33 to force the lower end of the limiting rod 32 to flip inward, so that the lower end of the limiting rod 32 presses against the lower end face of the liquid storage tube 2, completing the quick fixation. When the ring 35 is rotated in the opposite direction to loosen, the slider 31 moves downward. Under the action of the abutment rod 33, the lower end of the limiting rod 32 expands outward, and the liquid storage tube 2 can be directly pulled out for replacement. The cooperation between the protrusion 311 and the first limiting groove 131 ensures that the slider 31 moves linearly without deviation. The entire locking or releasing process can be completed by rotating with one hand without tools, which significantly improves the replacement efficiency and reduces the risk of cross-contamination.

[0035] Example 3: The difference from Example 2 is that this example discloses the drive mechanism 4 inside the housing 1;

[0036] The drive mechanism 4 includes a fixed plate 41 and a pressing head 45. The fixed plate 41 is fixedly connected to the bottom of the mounting cavity 11. An air pipe 42 is fixedly connected to the lower end of the fixed plate 41, and the air pipe 42 passes through and abuts against the buffer tube 22. A rubber cap 43 is fixedly connected to the upper end of the fixed plate 41. The pressing head 45 is slidably connected inside the mounting cavity 11. The lower end of the pressing head 45 is fixedly connected to the upper end of the rubber cap 43. A spring 44 is sleeved on the outer wall of the rubber cap 43. The upper end of the spring 44 is fixedly connected to the lower end of the pressing head 45, and the lower end of the spring 44 is fixedly connected to the upper end of the fixed plate 41. A second limiting groove 451 is opened on the side wall of the pressing head 45. A limiting block 111 is fixedly connected to the upper side of the mounting cavity 11, and the limiting block is located inside the second limiting groove 451 and slidably connected thereto.

[0037] In this embodiment, as Figures 2-3 As shown, when the pressing head 45 is pressed down, it moves down along the mounting cavity 11 and compresses the rubber cap 43 and the spring 44. The air in the rubber cap 43 is discharged through the air tube 42. After the pressing head 45 is released, the spring 44 rebounds, and the rubber cap 43 returns to its original shape, generating a continuous negative pressure. The liquid is quantitatively drawn into the dropper 21 and the buffer tube 22 through the dropper 21. The limiting block 111 slides in the second limiting groove 451 to limit the stroke of the pressing head 45, prevent over-compression, ensure consistent liquid intake each time, and achieve precise one-handed operation.

[0038] The working principle of this utility model is as follows:

[0039] After inserting the liquid storage tube 2 (buffer tube 22 + dropper 21) into the mounting groove 12, rotate the ring 35 clockwise. The inner wall thread of the ring 35 drives the sliders 31 on both sides to move upward synchronously. The sliders 31 are linked with the abutment rod 33 through the arc groove 312, which drives the limit rod 32 to flip inward and press the lower end of the liquid storage tube 2, completing the tool-free quick locking. Then, insert the dropper 21 into the liquid to be tested, and press the press head 45 downward with one hand. The press head 45 moves downward in the mounting cavity 11 and compresses the rubber cap 43 and the spring 44. The air in the rubber cap 43 passes through the air tube. After the pressure head 45 is released, the spring 44 rebounds, causing the cap 43 to return to its original shape, generating a continuous negative pressure. The liquid is quantitatively drawn into the buffer tube 22 through the dropper 21. The scale line 211 on the outer wall of the dropper 21 displays the liquid volume in real time. The limit block 111 and the second limit groove 451 cooperate to limit the stroke of the pressure head 45, ensuring that the liquid volume is consistent each time it is drawn or discharged. By rotating the ring 35 in the opposite direction, the slider 31 moves down, the limit rod 32 opens outward, and the storage tube 2 can be immediately pulled out and replaced, realizing one-handed, tool-free, precise, and interchangeable microbial pipetting operation.

[0040] Although the disclosure is as stated above, the scope of protection of this disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this utility model.

Claims

1. A pipette for microbial testing, comprising a housing (1) and a reservoir tube (2), characterized in that, The lower end face of the housing (1) is provided with an installation groove (12), the liquid storage tube (2) includes a buffer tube (22), the buffer tube (22) is disposed inside the installation groove (12), the lower end of the buffer tube (22) is fixedly connected to a dropper (21), and the upper end face of the housing (1) is provided with an installation cavity (11); it also includes: Fixing mechanism (3), which is installed at the lower end of housing (1), is used to fix buffer tube (22) inside mounting groove (12); The driving mechanism (4) is installed inside the mounting cavity (11) and is used to drive the liquid storage tube (2) to absorb liquid.

2. The pipette for microbial testing according to claim 1, characterized in that, The dropper (21) has graduation lines (211) on its side wall.

3. The pipette for microbial testing according to claim 1, characterized in that, The fixing mechanism (3) includes a slider (31) and a limiting rod (32). The left and right side walls of the housing (1) are provided with reserved grooves (13). A pair of sliders (31) are provided and are slidably connected inside the reserved grooves (13). An arc groove (312) is provided on the front end face of the slider (31). A pair of limiting rods (32) are provided and are rotatably connected inside the reserved grooves (13). The upper end face of the limiting rod (32) located at the lower end of the housing (1) abuts against the lower end face of the buffer tube (22). A groove (321) is provided on the upper end face of the limiting rod (32). A stop rod (33) is fixedly connected inside the groove (321). The stop rod (33) passes through the arc groove (312) and is slidably connected to it.

4. A pipette for microbial testing according to claim 3, characterized in that, The slider (31) has protrusions (311) fixedly connected to both ends. The reserved groove (13) has a first limiting groove (131) inside. The protrusions (311) are located inside the first limiting groove (131) and are slidably connected to it.

5. A pipette for microbial testing according to claim 3, characterized in that, The fixing mechanism (3) further includes a fixing ring (34) and a circular ring (35). The fixing ring (34) is fixedly connected to the outer wall of the housing (1). The circular ring (35) is rotatably connected to the lower end of the fixing ring (34). The inner wall of the circular ring (35) is provided with a threaded groove. The end of the slider (31) away from the axis of the housing (1) abuts against the inner wall of the circular ring (35) and is threadedly connected to it.

6. A pipette for microbial testing according to claim 1, characterized in that, The driving mechanism (4) includes a fixed plate (41) and a pressing head (45). The fixed plate (41) is fixedly connected to the bottom of the mounting cavity (11). An air pipe (42) is fixedly connected to the lower end of the fixed plate (41). The air pipe (42) passes through the buffer tube (22) and abuts against it. A rubber cap (43) is fixedly connected to the upper end of the fixed plate (41). The pressing head (45) is slidably connected to the inside of the mounting cavity (11). The lower end of the pressing head (45) The upper end of the rubber cap (43) is fixedly connected to the rubber cap (43). A spring (44) is sleeved on the outer wall of the rubber cap (43). The upper end of the spring (44) is fixedly connected to the lower end of the pressing head (45). The lower end of the spring (44) is fixedly connected to the upper end of the fixing plate (41). A second limiting groove (451) is opened on the side wall of the pressing head (45). A limiting block (111) is fixedly connected inside the upper side of the mounting cavity (11). The limiting block is located inside the second limiting groove (451) and is slidably connected to it.

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