Dustproof device for liquid chromatogram

Abstract

The utility model relates to the technical field of liquid chromatograms, in particular to a liquid chromatogram dustproof device which comprises a brush part, two supporting plates and two fixing plates, mounting parts are fixedly connected to the front face and the back face of the brush part, two first belt wheels are rotationally connected to the outer surface of one mounting part, and two second belt wheels are rotationally connected to the outer surface of the other mounting part. A first belt wheel, a sliding block, a second belt wheel, a third belt wheel and other components are arranged, the third belt wheel is driven by a motor to rotate, the third belt wheel drives a belt to move through transmission connection between the third belt wheel and the belt, and through connection among the first belt wheel, the second belt wheel and the belt, when the length of the lower half portion of the belt is reduced, the upper half portion of the belt is prolonged; at the moment, a first belt wheel drives a mounting part, a fixing plate and a sliding block to move up and down at the same time, the mounting part drives a brush part to ascend and descend at the moment, up-down reciprocating motion of the brush part is achieved through forward and reverse rotation of a motor, and then the effect that the device can drive the brush part to move up and down in a reciprocating mode to achieve the dust screen cleaning effect is achieved; excessive dust accumulation on the dustproof net is prevented.

Description

Technical Field

[0001] The present application relates to the technical field of liquid chromatography, and in particular to a dust prevention device for liquid chromatography. Background Art

[0002] Liquid chromatography is a type of separation and analysis technology, which is characterized by using liquid as the mobile phase. The stationary phase can have many forms, such as paper, thin plates and packed beds. In the development of chromatography technology, in order to distinguish various methods, their respective names were generated according to the form of the stationary phase, such as paper chromatography, thin layer chromatography and column liquid chromatography.

[0003] In order to prevent dust from entering the interior of the liquid chromatograph, existing liquid chromatographs are generally equipped with dustproof nets on the sides of the device, which can protect the liquid chromatograph while ensuring ventilation of the device.

[0004] However, in the existing dust protection of liquid chromatography, the dust screen is installed on the side of the device. After long-term use, a large amount of dust will accumulate on the surface of the dust screen, which is difficult to clean, resulting in a decrease in the dust protection effect. In addition, the existing dust screen and cooling fan cannot be quickly installed and disassembled. The operator is required to use specific tools and specific types of connectors to install the dust screen and the cooling fan. The installation and disassembly process takes a long time, and it is not convenient to inspect and replace the dust screen and the cooling fan.

[0005] Therefore, a new solution needs to be proposed to solve this problem. Utility Model Content

[0006] In order to facilitate cleaning of the surface of the dustproof net and prevent dust accumulation, the present application provides a dustproof device for liquid chromatography.

[0007] The dust prevention device of liquid chromatography provided by the present application adopts the following technical scheme: it comprises a brush member, two support plates and two fixed plates, the front and back sides of the brush member are fixedly connected with mounting members, the outer surface of one of the mounting members is rotatably connected with two pulleys 1, the right side surface of one of the support plates is rotatably connected with pulleys 2 and 3, a motor is arranged below the pulley 3, the output shaft of the motor is fixedly connected with the inner wall of the pulley 3, the outer surface of the pulley 3 is transmission-connected with a belt, the outer surface of each of the pulleys 1 and 2 is transmission-connected with the outer surface of the belt, the right side surface of each of the support plates is provided with a sliding groove, and the inner wall of each of the sliding grooves is slidably connected with a sliding block;

[0008] The right side surface of each sliding block is fixedly connected to the left side surface of the corresponding fixing plate, the right side surface of each fixing plate is fixedly connected to the left side surface of the corresponding mounting member, and the top and bottom ends of the belt are fixedly connected to the outer surface of the corresponding support plate;

[0009] A main body is arranged on the right side of the brush member, the right side surface of each of the support plates is fixedly connected to the left side surface of the main body, and the right side surface of the motor is fixedly embedded in the interior of the main body.

[0010] Optionally, the inner wall of the main body is in sliding contact with a dustproof net, the outer surface of the dustproof net is fixedly connected to square blocks arranged at equal distances, the right side of each square block is fixedly connected to a guide rod, and the outer surface of each guide rod is fixedly connected to a limiting block.

[0011] Optionally, the outer surface of each guide rod is slidably connected to a conical block, and the right end of each guide rod is fixedly connected to a semicircular block.

[0012] Optionally, two support rods are fixedly connected to the inner side wall of the main body, and a support block is fixedly connected to one side of each support rod close to each other. A cavity is provided inside each support block, and a clamping block is slidably connected to the inner wall of each cavity.

[0013] Optionally, one side of each of the blocks that is away from each other is fixedly connected to a sliding rod and a spring, the other end of each of the springs is fixedly connected to the inner wall of the corresponding cavity, and the outer surface of each of the sliding rods is slidably connected to the inner wall of the corresponding support rod and support block.

[0014] Optionally, the right side of the dustproof net is provided with extrusion blocks arranged at equal distances, the right side surface of each extrusion block is fixedly connected with spring 2 and a sleeve, and the other end of each spring 2 and sleeve is fixedly connected to the left side surface of the corresponding support block.

[0015] Optionally, the right side surface of the main body is fixedly connected to a mounting shell, the inner bottom wall of the mounting shell is rotatably connected to connecting members 1 arranged at equal distances, the outer surface of each connecting member 1 is fixedly connected to a gear, the right side surface of the main body is rotatably connected to a gear ring, and the outer surface of each gear is meshed with the inner wall of the gear ring.

[0016] Optionally, the inner wall of the mounting shell is in sliding contact with a cooling fan, the right side surface of the cooling fan is fixedly connected with equidistantly arranged connecting pieces 2, the left side surface of each connecting piece 2 is fixedly connected with a threaded rod, and the outer surface of each threaded rod is threadedly connected to the inner wall of the corresponding connecting piece 1.

[0017] In summary, this application includes the following beneficial technical effects:

[0018] 1. The present application sets components such as pulley one, a sliding block, pulley two, and pulley three, and the motor drives pulley three to rotate. Pulley three drives the belt to move through the transmission connection with the belt. Through the connection between pulley one, pulley two and the belt, when the length of the lower half of the belt is reduced, the upper half is extended. At this time, pulley one drives the mounting part, the fixed plate and the sliding block to move up and down at the same time. At this time, the mounting part drives the brush part to rise and fall, and the brush part is driven to reciprocate up and down by the forward and reverse rotation of the motor, thereby realizing the effect of cleaning the dustproof net by driving the brush part to reciprocate up and down, thereby preventing the dustproof net from accumulating too much dust.

[0019] The block is then pushed back by the spring to release the semicircular block and the conical block is moved, so that the semicircular block and the guide rod are driven to move.

[0020] 3. The present application sets up dustproof nets, cooling fans and other components, fixes the dustproof net on the left side of the main body through installation, and fixes the cooling fan on the right side of the main body through installation, so as to achieve the positioning and installation effect of the dustproof net and the cooling fan. The dustproof net can achieve the dustproof effect on the main body, and the cooling fan can prevent the internal temperature of the main body from being too high by installing it, so as to achieve the effect of heat dissipation while preventing dust from the device.

[0021] 4. The present application sets components such as a connecting piece 1, gears, a gear ring, and a threaded rod. The moving cooling fan drives the connecting piece 2 and the threaded rod to move, and the threaded rod is adapted to the corresponding connecting piece 1. At this time, the rotating gear ring drives the four gears to rotate synchronously, and the four gears simultaneously drive the corresponding connecting piece 1 to rotate. The threaded connection between the connecting piece 1 and the threaded rod is used to achieve the movement of the threaded rod, thereby driving the cooling fan to move and install it inside the mounting shell. The cooling fan can be removed by reversing the gear ring, thereby achieving the effect that the device can facilitate the quick installation and removal of the cooling fan, saving the time of tightening a single bolt, and the cooling fan can be installed and removed without the need for adapter tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall three-dimensional structure in the embodiment of the present application;

[0023] Figure 2 It is a structural schematic diagram of the connection relationship between the main body and the heat dissipation fan in the embodiment of the present application;

[0024] Figure 3 is a structural schematic diagram of the connection relationship between the support rod and the support block in an embodiment of the present application;

[0025] Figure 4 It is a schematic diagram of the structure of the enlarged portion A in the embodiment of the present application;

[0026] Figure 5 It is a structural schematic diagram of the connection relationship between the dustproof net and the square block in the embodiment of the present application;

[0027] Figure 6 is a structural schematic diagram of the connection relationship between the pulley 1 and the belt in the embodiment of the present application;

[0028] Figure 7 It is a structural schematic diagram of the connection relationship between the gear and the gear ring in the embodiment of the present application.

[0029] 1. Brush member; 2. Mounting member; 3. Pulley 1; 4. Support plate; 5. Sliding groove; 6. Sliding block; 7. Fixed plate; 8. Pulley 2; 9. Pulley 3; 10. Motor; 11. Belt; 12. Main body; 13. Dust net; 14. Square block; 15. Guide rod; 16. Limit block; 17. Semicircular block; 18. Conical block; 19. Support rod; 20. Support block; 21. Cavity; 22. Block; 23. Spring 1; 24. Sliding rod; 25. Sleeve; 26. Spring 2; 27. Extrusion block; 28. Mounting shell; 29. ​​Connector 1; 30. Gear; 31. Gear ring; 32. Cooling fan; 33. Connector 2; 34. Threaded rod. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-7 This application is described in further detail.

[0031] The present application discloses a dust prevention device for liquid chromatography. Figure 1 As shown, it includes a brush member 1, two support plates 4 and two fixing plates 7. The front and back sides of the brush member 1 are fixedly connected with mounting members 2. The outer surface of one of the mounting members 2 is rotatably connected to two pulleys 3. The mounting members 2 are mounted on the front and back sides of the brush member 1 to achieve a positioning and mounting effect on the mounting members 2, and the pulley 3 is placed on the surface of one of the mounting members 2 and rotatably connected to achieve a limiting effect on the pulley 3.

[0032] like Figure 6 As shown, the right side surface of one of the support plates 4 is rotatably connected with pulley two 8 and pulley three 9, and a motor 10 is provided below pulley three 9, and the output shaft of motor 10 is fixedly connected to the inner wall of pulley three 9, pulley two 8 and pulley three 9 are installed on the right side surface of one of the support plates 4, and are rotatably connected therebetween to achieve the positioning and installation effect of pulley two 8 and pulley three 9, the motor 10 is placed below pulley three 9, and the output shaft of motor 10 is fixedly connected to the inner wall of pulley three 9, and the forward and reverse rotation effect of pulley three 9 is achieved by the motor 10.

[0033] like Figure 6 As shown, the outer surface of pulley three 9 is transmission connected with belt 11, the outer surface of each pulley one 3 and pulley two 8 is transmission connected with the outer surface of belt 11, the right side surface of each support plate 4 is provided with a sliding groove 5, the inner wall of each sliding groove 5 is slidably connected with a sliding block 6, the belt 11 is placed on the outer surface of pulley three 9, and a transmission connection is set therebetween, the transmission effect of belt 11 is realized by the rotation of pulley three 9, the sliding groove 5 is positioned by the right side surface of the support plate 4, and the sliding block 6 is placed inside the sliding groove 5, and a sliding connection is set therebetween, and the limiting effect of the sliding block 6 is realized by the contour of the sliding groove 5.

[0034] like Figure 6 As shown, the right side surface of each sliding block 6 is fixedly connected to the left side surface of the corresponding fixed plate 7, the right side surface of each fixed plate 7 is fixedly connected to the left side surface of the corresponding mounting member 2, the top and bottom ends of the belt 11 are fixedly connected to the outer surface of the corresponding support plate 4, the sliding block 6 is connected to the corresponding fixed plate 7, and the movement of the fixed plate 7 can be achieved through the movement of the sliding block 6, and the limiting effect of the fixed plate 7 is achieved through the sliding block 6 on the other side, the mounting member 2 is connected to the fixed plate 7, and the movement effect of the mounting member 2 is achieved through the driving and limiting of the fixed plate 7, thereby driving the brush member 1 to move, and connecting the belt 11 to the corresponding support plate 4, the length of the belt 11 is fixed, and at this time, when the pulley three 9 rotates, the length of the lower half of the belt 11 changes, thereby adjusting the length change of the upper half, and at this time, the movement effect of the pulley one 3 can be achieved.

[0035] like Figure 1 , Figure 2 , Figure 3As shown, a main body 12 is provided on the right side of the brush member 1, and the right side surface of each support plate 4 is fixedly connected to the left side surface of the main body 12, and the right side surface of the motor 10 is fixedly embedded in the interior of the main body 12. The main body 12 is placed on the right side of the brush member 1, and the support plate 4 is fixed to the left side surface of the main body 12. The support and positioning effect of the support plate 4 is achieved through the main body 12, and the right side surface of the motor 10 is connected to the interior of the main body 12. The support effect of the motor 10 is achieved through the main body 12, ensuring that the motor 10 can drive the pulley three 9 to rotate while maintaining stability. The motor 10 can achieve forward and reverse rotation, which is convenient for achieving the forward and reverse effect of the pulley three 9.

[0036] like Figure 1 , Figure 3 , Figure 4 , Figure 5 As shown, the inner wall of the main body 12 is in sliding contact with a dustproof net 13, and the outer surface of the dustproof net 13 is fixedly connected with square blocks 14 arranged at equal distances, and the right side of each square block 14 is fixedly connected with a guide rod 15, and the outer surface of each guide rod 15 is fixedly connected with a limiting block 16, and the dustproof net 13 is installed on the inner wall of the main body 12, and the positioning effect of the dustproof net 13 is achieved through the groove of the main body 12, and the square block 14 is connected to the dustproof net 13, and the positioning and installation effect of the square block 14 is achieved through the dustproof net 13, and the guide rod 15 is installed on the right side of the square block 14, and the movement of the dustproof net 13 can be achieved. The limit block 16 is installed on the outer surface of the guide rod 15 to achieve the limiting effect of the limit block 16.

[0037] like Figure 4 As shown, the outer surface of each guide rod 15 is slidably connected with a conical block 18, and the right end of each guide rod 15 is fixedly connected with a semicircular block 17. The conical block 18 is placed on the outer surface of the guide rod 15, and a sliding connection is set therebetween. The limiting effect of the conical block 18 is achieved by the contour of the guide rod 15, and the semicircular block 17 is fixed to the right end of the guide rod 15. The sides of the semicircular block 17 and the conical block 18 that are close to each other are both flat, and the sides that are away from each other are conical and semicircular.

[0038] Combination Figure 3 and Figure 4The inner side wall of the main body 12 is fixedly connected to two support rods 19, and each support rod 19 is fixedly connected to a support block 20 on a side close to each other. A cavity 21 is provided inside each support block 20, and a block 22 is slidably connected to the inner wall of each cavity 21. The support rod 19 is installed on the inner side wall of the main body 12 to achieve the positioning and installation effect of the support rod 19, and the support block 20 is installed on a side close to each other of the support rod 19 to achieve the support effect of the support block 20. The support block 20 is used to The cavity 21 is positioned, and the block 22 is placed inside the cavity 21, and the block 22 is slidably connected to the corresponding cavity 21. The limiting effect of the block 22 is achieved through the contour of the cavity 21, and the locking effect of the semicircular block 17 is achieved through the connection between the block 22 and the flat surface of the semicircular block 17. The block 22 is connected to the conical block 18 through the inclined surface. Conversely, the block 22 can be disconnected from the semicircular block 17 through the inclined surface of the conical block 18, thereby achieving the effect of disassembling the semicircular block 17.

[0039] like Figure 4 As shown, each side of the block 22 that is away from each other is fixedly connected with a sliding rod 24 and a spring 23, and the other end of each spring 23 is fixedly connected to the inner wall of the corresponding cavity 21, and the outer surface of each sliding rod 24 is slidably connected to the inner wall of the corresponding support rod 19 and support block 20. The sliding rod 24 and spring 23 are fixed to the side of the block 22 that is away from each other, and the other end of the spring 23 is fixed to the inner wall of the cavity 21 to achieve the positioning and installation effect of the spring 23, and the sliding rod 24 is slidably connected to the corresponding support rod 19 and the inner wall of the support block 20. The limiting effect of the sliding rod 24 is achieved through the support rod 19 and the support block 20, and the block 22 can be tightened by the spring 23 to ensure that the block 22 can limit the semicircular block 17.

[0040] like Figure 4 As shown, the right side of the dustproof net 13 is provided with extrusion blocks 27 arranged at equal distances, and the right side surface of each extrusion block 27 is fixedly connected with a spring 26 and a sleeve 25, and the other end of each spring 26 and sleeve 25 is fixedly connected to the left side surface of the corresponding support block 20. The extrusion block 27 is placed on the right side of the dustproof net 13, and the spring 26 and sleeve 25 are fixed on the right side surface of the extrusion block 27, and the other end of the spring 26 and sleeve 25 are connected to the support block 20. The dustproof net 13 is tightened by the spring 26 to ensure the stability of the dustproof net 13 after installation, and the effect of the limit spring 26 is achieved by the sleeve 25.

[0041] like Figure 2 , Figure 7As shown, the right side surface of the main body 12 is fixedly connected with a mounting shell 28, and the inner bottom wall of the mounting shell 28 is rotatably connected with connecting members 29 arranged at equal distances, and the outer surface of each connecting member 29 is fixedly connected with a gear 30. The mounting shell 28 is placed on the right side surface of the main body 12 to achieve the positioning effect of the mounting shell 28, and the connecting member 29 is placed inside the mounting shell 28, and they are set to be rotatably connected to achieve the positioning effect of the connecting member 29, and the gear 30 is installed on the surface of the connecting member 29, and they are set to be fixedly connected, and the rotation effect of the connecting member 29 is achieved through the rotation of the gear 30.

[0042] like Figure 7 As shown, the right side surface of the main body 12 is rotatably connected with a gear ring 31, and the outer surface of each gear 30 is meshed with the inner wall of the gear ring 31. The gear ring 31 is placed on the right side surface of the main body 12, and the rotational connection between the gear ring 31 and the main body 12 is used to limit the gear ring 31. The gear 30 is meshed with the gear ring 31, and the gear ring 31 is rotated to achieve the effect of synchronous rotation of the four gears 30.

[0043] like Figure 7 As shown, the inner wall of the mounting shell 28 is in sliding contact with a cooling fan 32, and the right side surface of the cooling fan 32 is fixedly connected with two connecting pieces 33 arranged at equal distances. The cooling fan 32 is placed inside the mounting shell 28, and the positioning and installation effect of the cooling fan 32 is achieved through the contour of the mounting shell 28. The two connecting pieces 33 are installed on the right side surface of the cooling fan 32 to achieve the positioning effect of the two connecting pieces 33.

[0044] like Figure 7 As shown, the left side surface of each connecting member 2 33 is fixedly connected with a threaded rod 34, and the outer surface of each threaded rod 34 is threadedly connected to the inner wall of the corresponding connecting member 1 29. The threaded rod 34 is fixed to the left side surface of the connecting member 2 33 to achieve the positioning and installation effect of the threaded rod 34. The installation effect of the cooling fan 32 is achieved through the threaded connection between the threaded rod 34 and the connecting member 1 29, and vice versa. Disassembly is achieved.

[0045] The implementation principle of the dust-proof device of a liquid chromatography in the embodiment of the present application is as follows: first, the dust-proof screen 13 is moved and driven by the square block 14 to move the guide rod 15, and the guide rod 15 drives the semicircular block 17 to push the block 22 open, and the block 22 is tightened by the spring 1 23 to achieve the effect of locking the semicircular block 17. The dust-proof screen 13 is pressed again to drive the guide rod 15 to move again. At this time, the block 22 moves to the left side of the conical block 18, and the dust-proof screen 13 is released. The block 22 drives the conical block 18 to fit with the semicircular block 17 under the action of the spring 1 23. At this time, the block 22 continues to move and passes over the conical block 18, and the restriction on the semicircular block 17 is released. At this time, the effect of installing and removing the dust-proof screen 13 can be achieved by pressing. The drive of the motor 10 drives the pulley three 9 to rotate forward and reverse, and the pulley three 9, the pulley two 8, the pulley one 3 and the belt 11 are connected. The transmission connection is formed, and the length of the belt 11 is limited. At this time, the pulley 3 can achieve the effect of rising and falling, thereby driving the sliding block 6 and the fixed plate 7 to rise and fall, and the fixed plate 7 drives the mounting part 2 to rise and fall, and the mounting part 2 drives the brush part 1 to rise and fall, so as to clean the surface of the dustproof net 13, so as to achieve the effect of the device cleaning the dustproof net 13 to prevent dust from accumulating on the surface. The mobile cooling fan 32 drives the threaded rod 34 to adapt to the corresponding connecting part 29 through the connecting part 2 33, and the rotating gear ring 31 drives the gear 30 to rotate synchronously, and the gear 30 drives the connecting part 29 to rotate, and the connection with the threaded rod 34 is realized through the connecting part 29. At this time, the cooling fan 32 is installed in the inside of the mounting shell 28, otherwise the disassembly effect is achieved, and at the same time, the applicability of the installation can be improved, and the cooling fan 32 can be disassembled without using a heat setting tool.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A dust prevention device for liquid chromatography, comprising a brush member (1), two support plates (4) and two fixing plates (7), characterized in that: The front and back sides of the brush member (1) are fixedly connected to mounting members (2), the outer surface of one of the mounting members (2) is rotatably connected to two pulleys (3), the right side of one of the support plates (4) is rotatably connected to pulleys (2) and (3), a motor (10) is provided below the pulley (9), the output shaft of the motor (10) is fixedly connected to the inner wall of the pulley (9), the outer surface of the pulley (3) is transmission-connected to a belt (11), the outer surface of each of the pulleys (1) (3) and (2) (8) is transmission-connected to the outer surface of the belt (11), the right side of each of the support plates (4) is provided with a sliding groove (5), and the inner wall of each of the sliding grooves (5) is slidably connected to a sliding block (6); The right side surface of each sliding block (6) is fixedly connected to the left side surface of the corresponding fixing plate (7), the right side surface of each fixing plate (7) is fixedly connected to the left side surface of the corresponding mounting member (2), and the top and bottom ends of the belt (11) are fixedly connected to the outer surface of the corresponding support plate (4); A main body (12) is provided on the right side of the brush member (1), the right side surface of each support plate (4) is fixedly connected to the left side surface of the main body (12), and the right side surface of the motor (10) is fixedly embedded in the interior of the main body (12).

2. A dust-proof device for liquid chromatography according to claim 1, characterized in that: The inner wall of the main body (12) is in sliding contact with a dustproof net (13), the outer surface of the dustproof net (13) is fixedly connected to square blocks (14) arranged at equal distances, the right side of each square block (14) is fixedly connected to a guide rod (15), and the outer surface of each guide rod (15) is fixedly connected to a limiting block (16).

3. A dust prevention device for liquid chromatography according to claim 2, characterized in that: The outer surface of each guide rod (15) is slidably connected to a conical block (18), and the right end of each guide rod (15) is fixedly connected to a semicircular block (17).

4. The dust-proof device for liquid chromatography according to claim 1, characterized in that: Two support rods (19) are fixedly connected to the inner side wall of the main body (12); a side of each support rod (19) close to each other is fixedly connected to a support block (20); a cavity (21) is provided inside each support block (20); and a clamping block (22) is slidably connected to the inner wall of each cavity (21).

5. A dust prevention device for liquid chromatography according to claim 4, characterized in that: A side of each of the clamping blocks (22) that is away from each other is fixedly connected to a sliding rod (24) and a spring (23); the other end of each of the springs (23) is fixedly connected to the inner wall of the corresponding cavity (21); and the outer surface of each of the sliding rods (24) is slidably connected to the inner wall of the corresponding support rod (19) and support block (20).

6. A dust prevention device for liquid chromatography according to claim 2, characterized in that: The right side of the dustproof net (13) is provided with extrusion blocks (27) arranged at equal distances, the right side surface of each extrusion block (27) is fixedly connected to a second spring (26) and a sleeve (25), and the other end of each second spring (26) and sleeve (25) is fixedly connected to the left side surface of the corresponding support block (20).

7. The dust-proof device for liquid chromatography according to claim 1, characterized in that: The right side surface of the main body (12) is fixedly connected to a mounting shell (28), the inner bottom wall of the mounting shell (28) is rotatably connected to connecting members (29) arranged at equal distances, the outer surface of each connecting member (29) is fixedly connected to a gear (30), the right side surface of the main body (12) is rotatably connected to a gear ring (31), and the outer surface of each gear (30) is meshed with the inner wall of the gear ring (31).

8. A dust prevention device for liquid chromatography according to claim 7, characterized in that: The inner wall of the mounting shell (28) is in sliding contact with a cooling fan (32), the right side of the cooling fan (32) is fixedly connected to equally spaced connecting pieces (33), the left side of each connecting piece (33) is fixedly connected to a threaded rod (34), and the outer surface of each threaded rod (34) is threadedly connected to the inner wall of the corresponding connecting piece (29).

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