Quantitative continuous sample adding gun

Abstract

The utility model discloses a quantitative continuous sample adding gun, and belongs to the technical field of sample adding guns. The problem that an existing sample adding gun cannot achieve continuous and repeated sample adding is solved. The bottom of the gun barrel is connected with an eight-connection gun head; a sample adding adjusting pipe is movably connected in the gun barrel, and a limiting pipe is fixed in the sample adding adjusting pipe; a lifting rod is arranged in the limiting pipe; the bottom of the lifting rod is connected with the eight-connection gun head; a driving groove with a spiral structure is formed in the inner wall of the sample adding adjusting pipe; strip-shaped holes are formed in the two sides of the limiting pipe, and a lifting assembly in the limiting pipe penetrates through the two strip-shaped holes to be embedded into the driving groove. According to the utility model, the sample adding adjusting pipe is rotated during sample adding, the sample adding adjusting pipe drives the lifting component in the limiting pipe to lift along the strip-shaped hole through the spiral lifting action of the driving groove in the sample adding adjusting pipe, and the height of the lifting rod is limited through the position of the lifting component after the lifting component is lifted, so that the sample adding amount of the eight-connected gun head each time is controlled, and multiple sample adding is realized; the sample adding is accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of sample adding guns, in particular to a quantitative continuous sample adding row gun. Background Art

[0002] A pipette, also known as a liquid transfer gun, is a common instrument in biological, medical, and chemical laboratories. It is often used to quantitatively transfer small or trace amounts of liquids. To ensure the accuracy of the reagents being transferred, minimize experimental errors, and ensure good reproducibility, pipettes require high precision.

[0003] When using an existing pipette gun, the user presses the operating lever with the thumb and inserts the pipette tip vertically 2-3 mm below the reagent liquid surface; then the user slowly and steadily releases the thumb, draws a fixed amount of liquid, and then lifts the pipette tip out of the liquid surface. When the liquid is released, the operating lever of the pipette gun is pressed again to squeeze out the liquid drawn in by the tip. However, the existing pipette gun requires squeezing out all the drawn liquid each time it draws liquid in before adding the sample. Therefore, the existing pipette gun operates in a one-time aspiration and one-time addition mode, making it impossible to aspirate once and then add multiple samples, resulting in low work efficiency.

[0004] To achieve continuous multiple sample additions, a Chinese utility model patent with authorization publication number CN206285930U discloses a pipetting device capable of single-shot sampling and multiple quantitative sample removal. This patent utilizes a rotating handle to drive the piston, thereby achieving sample addition. However, this method of sample addition requires one hand to hold the entire device while the other hand to operate the rotating handle, making it extremely inconvenient. Furthermore, the piston's rise and fall synchronized with the rotation of the rotating handle during the sample addition process, making it impossible to precisely set the piston's movement before driving the piston to add sample. Consequently, inaccurate adjustment of the rotating handle can result in inaccurate sample addition. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a quantitative continuous sample adding gun, which solves the problem that the prior sample adding gun cannot achieve continuous and multiple sample addition.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A quantitative continuous sample adding gun includes a gun barrel, an eight-link gun head connected to the bottom of the gun barrel; a sample adding adjustment tube movably connected to the gun barrel, a limit tube fixed inside the sample adding adjustment tube; a lifting rod built into the limit tube;

[0008] A driving groove with a spiral structure is opened on the inner wall of the sample adding and adjusting tube; strip holes are opened on both sides of the limiting tube, and the lifting components inside the limiting tube pass through the two strip holes and are embedded in the driving groove.

[0009] In this solution, the sample addition adjustment tube is rotated when adding samples. The sample addition adjustment tube drives the lifting component inside the limit tube to move up and down along the strip hole through the spiral lifting action of its internal drive groove. When the lifting component moves to the appropriate position, the lifting rod is pressed to squeeze out the reagent inside the eight-piece gun head. This design limits the height of the lifting rod's descent by adjusting the position of the lifting component, thereby controlling the amount of sample added each time of the eight-piece gun head, and can achieve multiple additions. Each time you add samples, the position of the lifting component is pre-adjusted, and then the lifting rod is pressed to add samples. This makes it less likely for sample addition errors to occur, and the sample addition is accurate.

[0010] Furthermore, the lifting assembly includes a lifting platform, and a lifting rod is set through the through hole in the middle of the lifting platform; two driving rods are connected to both sides of the lifting platform, and the two driving rods pass through two strip holes and are embedded in the driving grooves respectively; a fixed platform is fixedly connected to the lifting rod, and the lifting platform limits the lifting height of the fixed platform.

[0011] In this solution, the sample loading adjustment tube is rotated, and the driving groove on the inner wall of the sample loading adjustment tube drives the lifting platform to move through two driving rods; after the lifting platform moves to a certain position, the height of the fixed platform is limited to be lowered, thereby controlling the loading of the lifting rod.

[0012] Furthermore, a ratchet mechanism is provided outside the sample adding and adjusting tube.

[0013] In this solution, the ratchet mechanism can prevent the sample adding adjustment tube from rotating slightly when the lifting rod is pressed after the sample adding adjustment tube is adjusted, thereby preventing the sample adding adjustment tube from rotating slightly and causing inaccurate precision control.

[0014] Furthermore, the ratchet mechanism includes a ratchet and an L-shaped block, the ratchet is fixed to the outside of the sample addition adjustment tube, and the L-shaped block is movably arranged on the gun barrel; the end of the L-shaped block is clamped between any two teeth on the edge of the ratchet.

[0015] Furthermore, a handrail is connected to the gun barrel, and a mounting cavity is opened on the side of the handrail; the L-shaped block is rotatably connected in the mounting cavity through a rotating shaft, one end of the L-shaped block is connected to the inner wall of the mounting cavity through a limit spring, and the other end of the L-shaped block abuts against the inner wall of the mounting cavity.

[0016] In this solution, when the ratchet is rotated, the teeth on the edge of the ratchet push the L-shaped block to squeeze the limit spring. After rotation, the L-shaped block continues to be stuck on the edge of the ratchet under the elastic force of the limit spring.

[0017] Furthermore, the eight-barrel gun head includes a shell, which is connected to the barrel; eight piston chambers are arranged side by side inside the shell, each piston chamber accommodates a piston, and the eight pistons are connected to the lifting rod through an eight-bar cross rod with eight branches.

[0018] Furthermore, a pipe joint is connected to the bottom of each piston cavity, and the pipe joint is used to connect the pipette tip.

[0019] In this solution, the lifting rod is controlled, and the lifting rod drives eight pistons to move up and down through eight connecting cross bars. When the eight pistons move upward, the reagent is sucked into the pipette tip; when the eight pistons move downward, the reagent is squeezed out of the pipette tip.

[0020] Furthermore, a clamping ring with a semicircular cross-section is provided on the outer wall of the sample adding and adjusting tube, and the clamping ring is embedded in a limiting groove inside the gun barrel.

[0021] In this solution, when installing the sample adjustment tube, it is directly placed into the barrel and pressed so that the clamping ring is embedded in the limiting groove, which is convenient for installation.

[0022] Furthermore, a reducing ring is provided on the top of the sample adding and adjusting tube, and the reducing ring fixes the limiting tube.

[0023] In this solution, the reducing ring can prevent the limiting tube from sliding out from the top of the sample addition regulating tube.

[0024] The beneficial effects of the utility model are:

[0025] The quantitative continuous sample-feeding gun provided by this utility model features a sample-feeding adjustment tube designed into the gun barrel. Rotating the tube adjusts the height of the lifting platform. The height of the lifting platform determines the amount of downward movement of the lifting rod, thereby controlling the amount of sample extruded each time, enabling multiple sample additions. Before each sample addition, the amount of movement of the lifting rod is adjusted by rotating the tube, and then the sample is added by pressing the rod. This ensures high sample addition accuracy and reduces the risk of operational errors. The outer wall of the top of the sample-feeding adjustment tube is exposed outside the gun barrel. When adding samples, the gun barrel is held and the sample-feeding adjustment tube is rotated by the thumb, allowing one-handed operation and ease of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the cross-sectional structure of a quantitative continuous sample adding gun of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the sample adding and regulating tube of the utility model;

[0028] Figure 3 This is a schematic diagram of the structure of the limiting tube of the utility model;

[0029] Figure 4 for Figure 1 Schematic diagram of the AA cross-section structure;

[0030] Figure 5 for Figure 1 A partial enlarged view of area B in the middle.

[0031] Reference numerals:

[0032] 1. Gun barrel; 11. Handrail; 2. Eight-link gun head; 21. Housing; 22. Piston; 23. Eight-link crossbar; 24. Pipe joint; 3. Sample adjustment tube; 31. Drive slot; 32. Ratchet; 33. L-shaped block; 34. Limit spring; 35. Snap ring; 36. Reducing ring; 5. Limit tube; 6. Lifting rod; 61. Fixing platform; 72. Driving rod; 71. Lifting platform DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The specific embodiments of the present invention are described below to facilitate understanding of the present invention by those skilled in the art. However, it should be understood that the present invention is not limited to the specific embodiments. For those skilled in the art, as long as various variations are within the spirit and scope of the present invention as defined and determined by the appended claims, these variations are obvious, and all inventions and creations utilizing the concepts of the present invention are protected.

[0034] like Figure 1 As shown, this embodiment provides a quantitative continuous sample adding gun, which can achieve quantitative continuous sample adding; has high sample adding accuracy and is easy to operate; and specifically includes:

[0035] Gun barrel 1, eight-barrel gun head 2, sample adding adjustment tube 3, limit tube 5, lifting rod 6 and lifting assembly;

[0036] Among them, the bottom of the barrel 1 is connected to the eight-link gun head 2; the barrel 1 is movably connected to the sample adding adjustment tube 3, and the sample adding adjustment tube 3 is fixed with a limit tube 5; the limit tube 5 is built into the lifting rod 6; Figure 2 As shown, the inner wall of the sample adding and regulating tube 3 is provided with a driving groove 31 of a spiral structure; Figure 3 As shown, strip holes are provided on both sides of the limiting tube 5, and the lifting assembly inside the limiting tube 5 passes through the two strip holes and is embedded in the driving groove 31; when adding samples, the sample adding adjustment tube 3 is rotated, and the sample adding adjustment tube 3 drives the lifting assembly inside the limiting tube 5 to rise and fall along the strip holes through the spiral lifting action of the driving groove 31 inside it. The height of the lifting rod 6 is limited by adjusting the position of the lifting assembly, thereby controlling the amount of sample added each time by the eight-gun head 2.

[0037] The lifting assembly includes a lifting platform 71 and two driving rods 72; the lifting rod 6 is set through the through hole in the middle of the lifting platform 71; two driving rods 72 are connected to both sides of the lifting platform 71, and the two driving rods 72 pass through two strip holes and are embedded in the driving groove 31; the lifting rod 6 is fixedly connected to the fixed platform 61, and the lifting platform 71 limits the height of the fixed platform 61; the sample loading adjustment tube 3 is rotated, and the driving groove 31 on the inner wall of the sample loading adjustment tube 3 drives the lifting platform 71 to move through the two driving rods 72.

[0038] A ratchet 32 mechanism is provided outside the sample adding adjustment tube 3 ; the ratchet 32 mechanism can prevent the sample adding adjustment tube 3 from slightly rotating when the lifting rod 6 is pressed after the sample adding adjustment tube 3 is adjusted, thereby causing inaccurate precision control.

[0039] like Figure 4 As shown, the ratchet 32 mechanism includes a ratchet 32 and an L-shaped block 33. The ratchet 32 is fixed to the outside of the sample addition adjustment tube 3, and the L-shaped block 33 is movably set on the barrel 1; the end of the L-shaped block 33 is stuck between any two teeth on the edge of the ratchet 32.

[0040] The gun barrel 1 is connected to a handrail 11, which has a mounting cavity defined on its side. An L-shaped block 33 is pivotally connected to the mounting cavity via a rotating shaft. One end of the L-shaped block 33 is connected to the inner wall of the mounting cavity via a retaining spring 34, while the other end of the L-shaped block 33 abuts the inner wall of the mounting cavity. When the ratchet 32 is rotated, the teeth on its edge push the L-shaped block 33 against the retaining spring 34. After the rotation, the L-shaped block 33 remains engaged with the edge of the ratchet 32 due to the elastic force of the retaining spring 34.

[0041] The eight-link pipette tip 2 includes a shell 21, which is connected to the barrel 1; eight piston 22 cavities are arranged side by side inside the shell 21, and each piston 22 cavity accommodates a piston 22. The eight pistons 22 are connected to the lifting rod 6 through an eight-link cross rod 23 with eight branches; the lifting rod 6 is controlled, and the lifting rod 6 drives the eight pistons 22 to rise and fall through the eight-link cross rod 23. The eight pistons 22 move upward, and the reagent is sucked into the pipette tip; the eight pistons 22 move downward, and the reagent is squeezed out of the pipette tip.

[0042] The bottom of each piston 22 cavity is connected to a pipe joint 24, which is used to connect to a pipette tip; the specifications of the pipette tip can be determined according to the actual sampling volume.

[0043] like Figure 5 As shown, the outer wall of the sample adding and adjusting tube 3 is provided with a snap ring 35 with a semicircular cross-section, and the snap ring 35 is embedded in the limiting groove inside the barrel 1; when installing the sample adding and adjusting tube 3, it can be directly placed into the barrel 1 and pressed to make the snap ring 35 embedded in the limiting groove, which is convenient for installation.

[0044] A reducing ring 36 is provided on the top of the sample adding and adjusting tube 3 , and the reducing ring 36 fixes the limiting tube 5 to prevent the limiting tube 5 from sliding out from the top of the sample adding and adjusting tube 3 .

[0045] The outer wall of the sample adding regulating tube 3 is provided with a scale, and when the sample adding regulating tube 3 is driven to rotate, the amount of sample added can be checked through the scale.

[0046] The working principle of this embodiment is:

[0047] When using the quantitative continuous sample loading gun provided in this embodiment, the pipette tip installed on the eight-piece gun head 2 is inserted into the taken reagent, and the lifting rod 6 is pulled upward to allow the reagent to be sucked into the pipette tip. Before the first sample loading, the sample loading adjustment tube 3 is rotated first. The sample loading adjustment tube 3 drives the lifting platform 71 inside the limit tube 5 to descend along the strip hole through the spiral lifting action of its internal drive groove 31. When the lifting platform 71 descends to the appropriate position, the lifting rod 6 is pressed to squeeze out the reagent inside the eight-piece gun head 2. When the second sample loading is performed, the sample loading adjustment tube 3 is rotated again to drive the lifting platform 71 to continue to descend. After it descends to a certain position, the lifting rod 6 is pressed to load the sample. This process is repeated to achieve multiple sample loading.

[0048] Those skilled in the art will appreciate that the embodiments herein are intended to help readers understand the principles of the present invention, and should be understood that the scope of protection of the present invention is not limited to such specific descriptions and embodiments. Those skilled in the art can, based on the technical teachings disclosed in this utility model, make various other specific variations and combinations that do not depart from the essence of the present invention, and such variations and combinations are still within the scope of protection of the utility model.

Claims

1. A quantitative continuous sample addition gun, characterized by: The invention comprises a gun barrel (1), wherein the bottom of the gun barrel (1) is connected to an eight-link gun head (2); a sample addition adjustment tube (3) is movably connected inside the gun barrel (1), a position limiting tube (5) is fixed inside the sample addition adjustment tube (3); and a lifting rod (6) is built into the position limiting tube (5); The inner wall of the sample addition adjustment tube (3) is provided with a driving groove (31) with a spiral structure; strip holes are provided on both sides of the position limiting tube (5); and the lifting assembly inside the position limiting tube (5) passes through the two strip holes and is embedded in the driving groove (31).

2. The quantitative continuous sample addition gun according to claim 1, characterized in that: The lifting assembly includes a lifting platform (71), and the lifting rod (6) is arranged to pass through the through hole in the middle of the lifting platform (71); two driving rods (72) are respectively connected to both sides of the lifting platform (71), and the two driving rods (72) respectively pass through the two strip-shaped holes and are embedded in the driving groove (31); A fixed platform (61) is fixedly connected to the lifting rod (6), and the lifting platform (71) limits the lifting height of the fixed platform (61).

3. The quantitative continuous sample addition gun according to claim 1, characterized in that: The sample adding regulating tube (3) is provided with a ratchet mechanism outside.

4. The quantitative continuous sample addition gun according to claim 3, characterized in that: The ratchet mechanism comprises a ratchet (32) and an L-shaped clamping block (33); the ratchet (32) is fixed to the outside of the sample addition adjustment tube (3); the L-shaped clamping block (33) is movably arranged on the gun barrel (1); and the end of the L-shaped clamping block (33) is clamped between any two teeth on the edge of the ratchet (32).

5. The quantitative continuous sample addition gun according to claim 4, characterized in that: The gun barrel (1) is connected to a handrail (11), and a mounting cavity is provided on a side of the handrail (11); the L-shaped block (33) is rotatably connected to the mounting cavity via a rotating shaft, one end of the L-shaped block (33) is connected to the inner wall of the mounting cavity via a limit spring (34), and the other end of the L-shaped block (33) abuts against the inner wall of the mounting cavity.

6. The quantitative continuous sample addition gun according to claim 1, characterized in that: The eight-link gun head (2) includes a shell (21) connected to the gun barrel (1); eight piston chambers are arranged side by side inside the shell (21), each piston chamber contains a piston (22), and the eight pistons (22) are connected to the lifting rod (6) through an eight-link cross rod (23) with eight branches.

7. The quantitative continuous sample addition gun according to claim 6, characterized in that: The bottom of each piston cavity is connected to a pipe joint (24), and the pipe joint (24) is used to connect a pipette tip.

8. The quantitative continuous sample addition gun according to claim 1, characterized in that: The outer wall of the sample adding and regulating tube (3) is provided with a snap ring (35) with a semicircular cross section, and the snap ring (35) is embedded in a limiting groove inside the gun barrel (1).

9. The quantitative continuous sample addition gun according to claim 1, characterized in that: A reducing ring (36) is provided on the top of the sample adding and regulating tube (3), and the reducing ring (36) fixes the position limiting tube (5).

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