Cross contamination prevention ventilation device for nucleic acid extraction

Abstract

The invention belongs to the technical field of ventilation devices, and discloses a cross contamination prevention ventilation device for nucleic acid extraction, the cross contamination prevention ventilation device comprises an extraction carrier, the upper end of the extraction carrier is fixedly connected with a plurality of fixing frames, the inner side surfaces of the fixing frames are fixedly connected with first shock absorbers, and the other ends of the first shock absorbers are fixedly connected with an annular frame; limiting rollers are rotationally connected to the inner side surfaces of the annular frames, extraction pipes abut against the outer side surfaces of the limiting rollers, the outer side surfaces of the bottom ends of the extraction pipes are attached to the inner side surfaces of the extraction carrying frames, auxiliary spring rods are fixedly connected between the opposite faces of the adjacent annular frames, and guide inclined blocks are fixedly connected to the upper ends of the middles of the annular frames. The inner side surface of the fixing frame is fixedly connected with a reset spring rod, the other end of the reset spring rod is fixedly connected with an inclined push block, and the end, close to the annular frame, of the inclined push block is fixedly connected with a second shock absorber.

Description

Technical Field

[0001] The invention belongs to the technical field of ventilation devices, and in particular relates to a cross-contamination prevention ventilation device for nucleic acid extraction. Background Art

[0002] Nucleic acid is a biological macromolecule composed of many nucleotides. It is one of the most basic substances of life. Nucleic acid is widely present in all animal and plant cells and microorganisms. Nucleic acid in organisms often combines with proteins to form nucleoproteins. Different nucleic acids have different chemical compositions and nucleotide arrangement sequences. According to the different chemical compositions, nucleic acids can be divided into ribonucleic acid and deoxyribonucleic acid. After the extraction of nucleic acid, ventilation is required. If highly sensitive reagents or high-concentration samples are discharged indoors, there will be a risk of cross-contamination if used for a long time. During the use of existing ventilation devices, there is often insufficient ventilation of internal gases, affecting the overall ventilation effect. At the same time, during ventilation, the extraction tube will shake, causing the extract to splash, affecting the quality of the finished product. Summary of the invention

[0003] The present invention aims at the problems of insufficient ventilation and incomplete positioning in the prior art and proposes the following technical solutions:

[0004] A cross-contamination prevention ventilation device for nucleic acid extraction comprises an extraction carrier, wherein the upper end of the extraction carrier is fixedly connected to a plurality of fixing frames, the inner surface of the fixing frame is fixedly connected to a first shock absorber, the other end of the first shock absorber is fixedly connected to an annular frame, the inner surface of the annular frame is rotatably connected to a limiting roller, the outer surface of the limiting roller abuts an extraction tube, the outer surface of the bottom end of the extraction tube is fitted with the inner surface of the extraction carrier, an auxiliary spring rod is fixedly connected between opposite surfaces of adjacent annular frames, the middle upper end of the annular frame is fixedly connected to a guide inclined block, the inner surface of the fixing frame is fixedly connected to a reset spring rod, the other end of the reset spring rod is fixedly connected to an inclined push block, one end of the inclined push block close to the annular frame is fixedly connected to a second shock absorber, and the other end of the second shock absorber passes through the fixing frame and is fixedly connected to the outer surface of the annular frame.

[0005] As a preferred embodiment of the above technical solution, the outer surface of the oblique push block at one end away from the annular frame is slidably connected to a special-shaped positioning strip, the outer surfaces of the oblique push block and the special-shaped positioning strip are both slidably connected to the inner surface of the fixed frame, the inner surface of the fixed frame is rotatably connected to a threaded screw, the outer surface of the threaded screw is threadedly connected to the inner surface of the special-shaped positioning strip, and the right end of the threaded screw is fixedly connected to a knob.

[0006] As a preferred embodiment of the above technical solution, a guide sleeve is clamped at the bottom end of the extraction carrier, and the outer surface of the guide sleeve is slidably connected to a mounting plate, the bottom end of the mounting plate is fixedly connected to a base, the upper end of the base is fixedly connected to an extraction chamber, and the left end of the extraction chamber is fixedly connected to the right end of the mounting plate.

[0007] As a preferred embodiment of the above technical solution, an air inlet chamber and an air outlet chamber are provided inside the extraction chamber, an air outlet is provided at the upper left end of the extraction chamber, the inner surface of the air outlet is connected to the inner surface of the air inlet chamber, an adjusting baffle is fixedly connected to the bottom inner surface of the air inlet chamber, an air duct seat is fixedly connected to the left end of the extraction chamber, the opening on the air duct seat corresponds one-to-one to the air duct seat, an air duct cover is fixedly connected to the upper end of the air duct seat, and a fan cover is fixedly connected to the upper end of the air duct cover.

[0008] As a preferred embodiment of the above technical solution, a centrifugal fan is fixedly connected to the inner bottom end of the fan cover, a square filter cotton is fixedly connected to the interior of the air duct cover, the square filter cotton is located above the inner cavity of the air duct seat, the upper end of the extraction cavity is fixedly connected to an air inlet, the inner surface of the air inlet is connected to the inner surface of the air outlet cavity, the upper end of the air inlet is fixedly connected to an air inlet block, the inner surface of the upper end opening of the air inlet block is fixedly connected to a sealing sleeve, the left end of the air inlet block is fixedly connected to an air inlet duct, and the left end of the air inlet duct is fixedly connected to an air inlet fan.

[0009] As a preferred embodiment of the above technical solution, the inner surface of the right end of the guide sleeve is slidably connected to a cavity door, the middle part of the right end of the cavity door is fixedly connected to an electric push rod, the output end of the electric push rod is fixedly connected to a movable slide rail, the outer surface of the movable slide rail is slidably connected to three sliding bars, and the right ends of the sliding bars are fixedly connected to limited push bars.

[0010] As a preferred embodiment of the above technical solution, the bottom end of the fixed frame is slidably connected with a partition, the right end of the cavity door, the outer surface of the partition and the bottom end of the fixed frame are all fixedly connected with connecting spring rods, a square frame is fixedly connected between the opposite ends of adjacent connecting spring rods, the outer surface of the square frame is fixedly connected with a limiting slide rail, and the inner surface of the limiting slide rail is slidably connected to the bottom outer surface of the sliding bar.

[0011] As a preferred embodiment of the above technical solution, the inner surface of the square frame is rotatably connected with a lower cam, the outer surface of the lower cam respectively abuts against the outer surface of the partition, the left end of the cavity door and the bottom end of the extraction carrier, the upper end of the lower cam is fixedly connected with an upper cam, and the outer surface of the upper cam abuts against the outer surface of the limit push strip.

[0012] As a preferred embodiment of the above technical solution, a special-shaped sealing strip is fixedly connected to the cavity door, and the special-shaped sealing strip matches the shape of the air outlet cavity. The inner surfaces of the cavity door and the extraction cavity are both clamped with magnetic blocks, and adjacent magnetic blocks are attracted to each other.

[0013] The beneficial effects of the present invention are:

[0014] By setting up the inclined transmission of the limit roller and the guide bevel block, auxiliary guidance can be performed when the extraction tube is placed and clamped, which is convenient for the staff to place it, and the connecting rod action of the auxiliary spring rod and the annular frame can ensure the coaxiality of the extraction tube and the fixed cylinder on the extraction carrier and evenly disperse the force, thereby improving the overall stability and reliability. At the same time, through the relative sliding of the inclined surface of the inclined push block and the special-shaped positioning strip and the threaded transmission of the threaded screw and the special-shaped positioning strip, when the knob is twisted, the position of the annular frame can be changed by changing the position of the inclined push block, thereby adjusting the clamping degree of the extraction tube, preventing liquid splashing, and improving the overall functionality and practicality.

[0015] By providing a limit push strip that is shortened from left to right and the abutment of the upper cam, when the electric push rod drives the movable slide rail to move forward and backward, the lower cam can be driven to rotate in sequence, thereby accurately controlling the left and right moving distance of the extraction carrier, ensuring that the top of each extraction tube is aligned with the air inlet in sequence, improving the purification of the internal air, and at the same time providing a plurality of groups of staggered air inlet chambers and air outlet chambers, ensuring that the gas flows from the upper end of the extraction carrier to the bottom end and then enters the air duct seat, further improving the overall ventilation stability and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Shown is a perspective view of a cross-contamination prevention ventilation device for nucleic acid extraction;

[0017] Figure 2 Shown is a stereoscopic view of a cross-contamination prevention ventilation device for nucleic acid extraction from another perspective;

[0018] Figure 3 Shown is a perspective view of the extraction chamber;

[0019] Figure 4 Shown is a stereoscopic view of the extraction chamber from another perspective;

[0020] Figure 5 Shown is a schematic diagram of the internal structure of a cross-contamination prevention ventilation device for nucleic acid extraction;

[0021] Figure 6 Shown is a schematic diagram of some parts of a cross-contamination prevention ventilation device for nucleic acid extraction;

[0022] Figure 7 Shown is a partial structural diagram of a cross-contamination prevention ventilation device for nucleic acid extraction;

[0023] Figure 8 Shown is a schematic diagram of partial parts of a cross-contamination prevention ventilation device for nucleic acid extraction;

[0024] Fig. 9 Shown is a partial parts structure diagram of a cross-contamination prevention ventilation device for nucleic acid extraction.

[0025] In the figure: 1, extraction carrier; 2, fixing frame; 3, first shock absorber; 4, annular frame; 5, limiting roller; 6, extraction tube; 7, auxiliary spring rod; 8, guide inclined block; 9, reset spring rod; 10, inclined push block; 11, second shock absorber; 12, special-shaped positioning strip; 13, threaded screw; 14, knob; 15, guide sleeve; 16, mounting plate; 17, base; 18, extraction chamber; 19, air inlet chamber; 20, air outlet chamber; 21, air outlet; 22, air duct seat; 23, air duct cover ; 24. Fan cover; 25. Centrifugal fan; 26. Square filter cotton; 27. Air inlet; 28. Air inlet block; 29. ​​Sealing sleeve; 30. Air inlet duct; 31. Air inlet fan; 32. Adjustment baffle; 33. Chamber door; 34. Electric push rod; 35. Moving slide rail; 36. Sliding bar; 37. Limit push bar; 38. Partition; 39. Connecting spring rod; 40. Square frame; 41. Limit slide rail; 42. Lower cam; 43. Upper cam; 44. Special-shaped sealing strip; 45. Magnetic block. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0027] Example 1

[0028] The present invention provides a cross-contamination prevention ventilation device for nucleic acid extraction, such as Figures 1 to 9As shown, it includes an extraction carrier 1, the upper end of the extraction carrier 1 is fixedly connected to a plurality of fixing frames 2, the inner surface of the fixing frame 2 is fixedly connected to a first shock absorber 3, and radial shock absorption is performed on the extraction tube 6, the other end of the first shock absorber 3 is fixedly connected to an annular frame 4, the inner surface of the annular frame 4 is rotatably connected to a limiting roller 5, the outer surface of the limiting roller 5 abuts against the extraction tube 6, the outer surface of the bottom end of the extraction tube 6 is in contact with the inner surface of the extraction carrier 1, and auxiliary spring rods 7 are fixedly connected between the opposite surfaces of adjacent annular frames 4, and the connecting rod effect of the auxiliary spring rods 7 and the annular frame 4 can ensure the synchronous movement of the annular frame 4, thereby improving To ensure the overall coaxiality and stability, the middle upper end of the annular frame 4 is fixedly connected with a guide bevel block 8, the inner surface of the fixed frame 2 is fixedly connected with a return spring rod 9, the other end of the return spring rod 9 is fixedly connected with an oblique push block 10, the end of the oblique push block 10 close to the annular frame 4 is fixedly connected with a second shock absorber 11, the other end of the second shock absorber 11 passes through the fixed frame 2 and is fixedly connected with the outer surface of the annular frame 4, the outer surface of the oblique push block 10 away from the annular frame 4 is slidably connected with a special-shaped positioning strip 12, the outer surfaces of the oblique push block 10 and the special-shaped positioning strip 12 are both slidably connected with the inner surface of the fixed frame 2, and the fixed frame 2 The inner surface of the extraction rack 1 is rotatably connected with a threaded screw 13, the outer surface of the threaded screw 13 is threadedly connected to the inner surface of the special-shaped positioning strip 12, the right end of the threaded screw 13 is fixedly connected with a knob 14, the bottom end of the extraction carrier 1 is clamped with a guide sleeve 15, the outer surface of the guide sleeve 15 is slidably connected with a mounting plate 16, the bottom end of the mounting plate 16 is fixedly connected with a base 17, the upper end of the base 17 is fixedly connected with an extraction chamber 18, the left end of the extraction chamber 18 is fixedly connected to the right end of the mounting plate 16, and the inclined surface transmission of the limited roller 5 and the guide inclined block 8 can be used to place and clamp the extraction tube 6. Auxiliary guidance makes it easier for staff to place the tube. The connecting rod action of the auxiliary spring rod 7 and the annular frame 4 can ensure the coaxiality of the extraction tube 6 and the fixed tube on the extraction carrier 1 and evenly disperse the force, thereby improving the overall stability and reliability. At the same time, through the relative sliding of the inclined surface of the inclined push block 10 and the special-shaped positioning strip 12 and the threaded transmission of the threaded screw 13 and the special-shaped positioning strip 12, the position of the annular frame 4 can be adjusted by changing the position of the inclined push block 10 when the knob 14 is twisted, thereby adjusting the degree of clamping of the extraction tube 6 to prevent liquid splashing and improve the overall functionality and practicality.

[0029] like Figures 1 to 9As shown, an air inlet chamber 19 and an air outlet chamber 20 are provided inside the extraction chamber 18, an air outlet 21 is provided at the upper left end of the extraction chamber 18, the inner surface of the air outlet 21 is communicated with the inner surface of the air inlet chamber 19, an adjusting baffle 32 is fixedly connected to the bottom inner surface of the air inlet chamber 19, an air duct seat 22 is fixedly connected to the left end of the extraction chamber 18, an opening on the air duct seat 22 corresponds one to one with the air duct seat 22, an air duct cover 23 is fixedly connected to the upper end of the air duct seat 22, a fan cover 24 is fixedly connected to the upper end of the air duct cover 23, a centrifugal fan 25 is fixedly connected to the inner bottom end of the fan cover 24, a square filter cotton 26 is fixedly connected to the inside of the air duct cover 23, and the square filter cotton 26 is located above the inner cavity of the air duct seat 22, which can purify the gas and ensure the overall Safety and reliability, the upper end of the extraction chamber 18 is fixedly connected with an air inlet 27, the inner surface of the air inlet 27 is connected to the inner surface of the air outlet chamber 20, the upper end of the air inlet 27 is fixedly connected with an air inlet block 28, the inner surface of the upper end opening of the air inlet block 28 is fixedly connected with a sealing sleeve 29, the left end of the air inlet block 28 is fixedly connected with an air inlet pipe 30, the left end of the air inlet pipe 30 is fixedly connected with an air inlet fan 31, the inner surface of the right end of the guide sleeve 15 is slidably connected with a chamber door 33, the middle part of the right end of the chamber door 33 is fixedly connected with an electric push rod 34, the output end of the electric push rod 34 is fixedly connected with a movable slide rail 35, the outer surface of the movable slide rail 35 is slidably connected with three sliding bars 36, the right ends of the sliding bars 36 are fixedly connected with limited push bars 37, The bottom end of the fixed frame 2 is slidably connected with a partition 38, the right end of the chamber door 33, the outer surface of the partition 38 and the bottom end of the fixed frame 2 are all fixedly connected with connecting spring rods 39, and a square frame 40 is fixedly connected between the opposite ends of adjacent connecting spring rods 39, the outer surface of the square frame 40 is fixedly connected with a limiting slide rail 41, the inner surface of the limiting slide rail 41 is slidably connected with the bottom outer surface of the sliding bar 36, and the inner surface of the square frame 40 is rotatably connected with a lower cam 42, the outer surface of the lower cam 42 respectively abuts against the outer surface of the partition 38, the left end of the chamber door 33 and the bottom end of the extraction carrier 1, the upper end of the lower cam 42 is fixedly connected with an upper cam 43, the outer surface of the upper cam 43 abuts against the outer surface of the limiting push strip 37, and the chamber door 33 is fixedly connected with The special-shaped sealing strip 44 is consistent with the shape of the air outlet chamber 20 to prevent cross contamination caused by lateral air leakage. The inner surfaces of the chamber door 33 and the extraction chamber 18 are both clamped with magnetic blocks 45. The magnetic attraction of adjacent magnetic blocks 45 facilitates the overall switch stability and improves practicality. By providing a limit push strip 37 that is shortened from left to right and abuts against the upper cam 43, when the electric push rod 34 drives the movable slide rail 35 to move forward and backward, the lower cam 42 is driven to rotate in sequence, so that the left and right moving distance of the extraction carrier 1 can be accurately controlled to ensure that the top of each extraction tube 6 is aligned with the air inlet 27 in sequence, so as to improve the purification of the internal air. At the same time, a plurality of groups of staggered air inlet chambers 19 and air outlet chambers 20 are provided.Ensure that the gas flows from the upper end of the extraction carrier 1 to the bottom end and then enters the air duct seat 22, further improving the overall ventilation stability and reliability.

[0030] Working principle: When in use, open the chamber door 33 and put the extraction tube 6 into the extraction carrier 1. By setting the limited roller 5 and the inclined transmission of the guide inclined block 8, auxiliary guidance can be performed when the extraction tube 6 is placed and clamped, which is convenient for the staff to place it, and the connecting rod action of the auxiliary spring rod 7 and the annular frame 4 can ensure the coaxiality of the extraction tube 6 and the fixed cylinder on the extraction carrier 1 and evenly disperse the force, thereby improving the overall stability and reliability. At the same time, through the relative sliding of the inclined surface of the inclined push block 10 and the special-shaped positioning strip 12 and the threaded transmission of the threaded screw 13 and the special-shaped positioning strip 12, when the knob 14 is twisted, the position of the annular frame 4 can be changed by the position of the inclined push block 10, thereby adjusting the clamping degree of the extraction tube 6 to prevent liquid splashing, thereby improving the overall functionality and practicality. Close the chamber door 33, start the electric push rod 34, and set a limited push rod 34 that shortens from left to right in sequence. The abutment between the strip 37 and the upper cam 43 can drive the lower cam 42 to rotate in sequence when the electric push rod 34 drives the movable slide rail 35 to move forward and backward, so as to accurately control the left and right moving distance of the extraction carrier 1, ensure that the top of each extraction tube 6 is aligned with the air inlet 27 in sequence, improve the purification of the internal air, start the centrifugal fan 25 to suck air, and the external air flow enters from the air inlet fan 31, flows through the air inlet pipe 30 and the air inlet block 28 into the extraction chamber 18, squeezes out the internal air through the air inlet 27 and the air outlet chamber 20, and enters the air duct seat 22 through the adjusting baffle 32, the air inlet chamber 19 and the air outlet 21. The staggered distribution of the air inlet chamber 19 and the air outlet chamber 20 and the uniform channel distribution in the air duct seat 22 further improve the overall air suction uniformity and stability, and the gas is purified by the square filter cotton 26 above the air duct seat 22 and discharged from the guide port of the fan cover 24 to complete the ventilation.

[0031] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A cross-contamination prevention ventilation device for nucleic acid extraction, characterized in that: The invention comprises an extraction carrier (1), wherein the upper end of the extraction carrier (1) is fixedly connected to a plurality of fixing frames (2), the inner surface of the fixing frame (2) is fixedly connected to a first shock absorber (3), the other end of the first shock absorber (3) is fixedly connected to an annular frame (4), the inner surface of the annular frame (4) is rotatably connected to a limiting roller (5), the outer surface of the limiting roller (5) is abutted against an extraction tube (6), the outer surface of the bottom end of the extraction tube (6) is in contact with the inner surface of the extraction carrier (1), and the adjacent annular frames are connected to the inner surface of the extraction carrier (1). An auxiliary spring rod (7) is fixedly connected between opposite surfaces of the frame (4); a guide inclined block (8) is fixedly connected to the middle upper end of the annular frame (4); a return spring rod (9) is fixedly connected to the inner surface of the fixed frame (2); the other end of the return spring rod (9) is fixedly connected to an inclined push block (10); one end of the inclined push block (10) close to the annular frame (4) is fixedly connected to a second shock absorber (11); the other end of the second shock absorber (11) passes through the fixed frame (2) and is fixedly connected to the outer surface of the annular frame (4).

2. A cross-contamination prevention ventilation device for nucleic acid extraction according to claim 1, characterized in that: The outer surface of the end of the oblique push block (10) away from the annular frame (4) is slidably connected to a special-shaped positioning strip (12), the outer surfaces of the oblique push block (10) and the special-shaped positioning strip (12) are both slidably connected to the inner surface of the fixed frame (2), the inner surface of the fixed frame (2) is rotatably connected to a threaded screw (13), the outer surface of the threaded screw (13) is threadedly connected to the inner surface of the special-shaped positioning strip (12), and the right end of the threaded screw (13) is fixedly connected to a knob (14).

3. A cross-contamination prevention ventilation device for nucleic acid extraction according to claim 2, characterized in that: The bottom end of the extraction carrier (1) is clamped with a guide sleeve (15), the outer surface of the guide sleeve (15) is slidably connected to a mounting plate (16), the bottom end of the mounting plate (16) is fixedly connected to a base (17), the upper end of the base (17) is fixedly connected to an extraction chamber (18), and the left end of the extraction chamber (18) is fixedly connected to the right end of the mounting plate (16).

4. A cross-contamination prevention ventilation device for nucleic acid extraction according to claim 3, characterized in that: An air inlet chamber (19) and an air outlet chamber (20) are provided inside the extraction chamber (18); an air outlet (21) is provided at the upper left end of the extraction chamber (18); the inner surface of the air outlet (21) is communicated with the inner surface of the air inlet chamber (19); an adjusting baffle (32) is fixedly connected to the bottom inner surface of the air inlet chamber (19); the left end of the extraction chamber (18) is fixedly connected to an air duct seat (22); the opening on the air duct seat (22) corresponds one-to-one to the air duct seat (22); the upper end of the air duct seat (22) is fixedly connected to an air duct cover (23); and the upper end of the air duct cover (23) is fixedly connected to a fan cover (24).

5. A cross-contamination prevention ventilation device for nucleic acid extraction according to claim 4, characterized in that: The inner bottom end of the fan cover (24) is fixedly connected to a centrifugal fan (25); the inner part of the air duct cover (23) is fixedly connected to a square filter cotton (26); the square filter cotton (26) is located above the inner cavity of the air duct seat (22); the upper end of the extraction chamber (18) is fixedly connected to an air inlet (27); the inner surface of the air inlet (27) is connected to the inner surface of the air outlet chamber (20); the upper end of the air inlet (27) is fixedly connected to an air inlet block (28); the inner surface of the upper opening of the air inlet block (28) is fixedly connected to a sealing sleeve (29); the left end of the air inlet block (28) is fixedly connected to an air inlet pipe (30); and the left end of the air inlet pipe (30) is fixedly connected to an air inlet fan (31).

6. A cross-contamination prevention ventilation device for nucleic acid extraction according to claim 3, characterized in that: The inner surface of the right end of the guide sleeve (15) is slidably connected to a cavity door (33), the middle part of the right end of the cavity door (33) is fixedly connected to an electric push rod (34), the output end of the electric push rod (34) is fixedly connected to a movable slide rail (35), the outer surface of the movable slide rail (35) is slidably connected to three sliding bars (36), and the right ends of the sliding bars (36) are all fixedly connected to limited push bars (37).

7. A cross-contamination prevention ventilation device for nucleic acid extraction according to claim 6, characterized in that: The bottom end of the fixed frame (2) is slidably connected to a partition (38); the right end of the chamber door (33), the outer surface of the partition (38) and the bottom end of the fixed frame (2) are all fixedly connected to connecting spring rods (39); a square frame (40) is fixedly connected between the opposite ends of the adjacent connecting spring rods (39); the outer surface of the square frame (40) is fixedly connected to a limiting slide rail (41); the inner surface of the limiting slide rail (41) is slidably connected to the outer surface of the bottom of the sliding bar (36).

8. A cross-contamination prevention ventilation device for nucleic acid extraction according to claim 7, characterized in that: The inner surface of the square frame (40) is rotatably connected to a lower cam (42), and the outer surface of the lower cam (42) is respectively abutted against the outer surface of the partition (38), the left end of the chamber door (33) and the bottom end of the extraction carrier (1); the upper end of the lower cam (42) is fixedly connected to an upper cam (43), and the outer surface of the upper cam (43) is abutted against the outer surface of the limit push strip (37).

9. The cross-contamination prevention ventilation device for nucleic acid extraction according to claim 7, characterized in that: A special-shaped sealing strip (44) is fixedly connected to the chamber door (33), and the special-shaped sealing strip (44) matches the shape of the air outlet chamber (20). The inner surfaces of the chamber door (33) and the extraction chamber (18) are both clamped with magnetic blocks (45), and adjacent magnetic blocks (45) are magnetically attracted to each other.

Images