Explosion-proof cryogenic liquid level gauge

Abstract

The present application relates to the field of liquid level meter, disclose a kind of anti-explosion low temperature liquid level meter, including liquid level meter pipe, flange and transparent protective plate, the liquid level meter pipe one end is provided with flange, the transparent protective plate is installed on the scale dial of the liquid level meter pipe, mobile structure is set on the right side of the liquid level meter pipe, anti-frost structure is set at the other end of the liquid level meter pipe, under the action of anti-frost structure, mobile structure and cleaning structure, the blowing and wiping work of transparent protective plate can be realized, and cooperate with transmission structure, only under the action of the same electric telescopic rod, blowing and cleaning structure wiping cotton mobile wiping work can be realized, not only the work energy consumption is lower, also reduce noise pollution;The setting of driving structure can drive wiping cotton to reciprocate along the width direction of liquid level meter pipe when wiping cotton moves back and forth along the length direction of liquid level meter pipe, improve the wiping effect of transparent protective plate.

Description

Technical Field

[0001] This invention relates to the technical field of level gauges, and in particular to an explosion-proof cryogenic level gauge. Background Technology

[0002] The explosion-proof cryogenic level gauge is a level measurement device specifically designed for flammable and explosive environments and cryogenic working conditions. It combines explosion-proof technology and cryogenic protection measures to ensure measurement safety and accuracy.

[0003] In existing explosion-proof cryogenic level gauges, a conduit is installed, and a motor drives a fan blade to generate airflow. The airflow is blown out through the conduit from the opening in the housing, which helps to purge the transparent protective plate and prevents icing and frost formation, making the level gauge's indicator panel display clearer. Furthermore, an electric push rod moves a sponge pad along a slide groove to wipe away frost and fog from the surface of the transparent protective plate, further improving the display effect of the indicator panel.

[0004] However, in actual use, the motor and electric push rod need to be started separately to blow and wipe the transparent protective plate. This not only increases the energy consumption, but also generates noise during the operation of the motor, causing noise pollution. Therefore, there are areas for improvement. Summary of the Invention

[0005] To address the problems mentioned in the background section, the present invention provides an explosion-proof cryogenic level gauge.

[0006] The explosion-proof cryogenic level gauge provided by this invention adopts the following technical solution:

[0007] An explosion-proof cryogenic liquid level gauge includes a liquid level gauge tube, a flange, and a transparent protective plate. The flange is provided at one end of the liquid level gauge tube, the transparent protective plate is installed on the scale on the liquid level gauge tube, a movable structure is provided on the right side of the liquid level gauge tube, and an anti-frost structure is provided at the other end of the liquid level gauge tube.

[0008] The anti-frost structure includes a U-shaped plate fastened to the other end of the level gauge tube by bolts. A fixed cylinder is fixedly installed in the middle of the inner wall of the U-shaped plate. A heating mesh is provided on the inner wall of the fixed cylinder at the end closest to the level gauge tube. A second rotating rod is rotatably connected to the inner wall of the fixed cylinder at the end furthest from the level gauge tube. A first spiral groove is formed on the second rotating rod. A movable disk is movably sleeved on the second rotating rod. A groove is formed on the side of the movable disk. A first insert rod is fixedly inserted into the groove. One end of the first insert rod is movably inserted into the first spiral groove. An electric telescopic rod is installed on the U-shaped plate. One end of the output shaft of the electric telescopic rod is connected to the movable disk. An installation sleeve is fixedly sleeved on the upper end of the second rotating rod. A fan blade is provided on the installation sleeve. A first air supply pipe is connected to one end of the fixed cylinder. One end of the first air supply pipe extends to the space between the transparent protective plate and the dial.

[0009] Preferably, the movable structure includes a first fixed frame installed on the right side of the level gauge tube, a third rotating rod rotatably passing through the first fixed frame near the level gauge tube, a first movable block sleeved on the third rotating rod, a second insert rod fixedly inserted into the first movable block, a second spiral groove formed on the third rotating rod, one end of the second insert rod movably inserted into the second spiral groove, a first vertical bar connected to the top of the first movable block, a through bar movably passing through the top of the first vertical bar, a cleaning structure provided at one end of the through bar, a transmission structure provided between the third rotating rod and the second rotating rod, and a driving structure provided on the left side of the level gauge tube.

[0010] Preferably, the cleaning structure includes two fixed discs disposed at one end of the through strip, and a rotating shaft is rotatably connected between the two fixed discs. One of the fixed discs is fixedly installed on the through strip, and an installation plate is fixedly sleeved on the rotating shaft. An installation frame is fastened to the underside of the installation plate by bolts. A wiping cotton is disposed in the installation frame by a clamping structure, and an air supply structure is disposed between the installation frame and the fixed cylinder.

[0011] Preferably, the clamping structure includes two push rods that movably pass through the mounting frame. One end of each push rod is connected to a push block, and the other end is connected to a connecting piece. A first spring is sleeved on the push rod near the connecting piece. The two ends of the first spring are connected to the mounting frame and the connecting piece, respectively. Through slots are provided on both sides of the mounting frame, and an insertion block is movably inserted into each through slot. One end of the connecting piece is connected to the insertion block. Multiple clamping rods are connected to the inner side of the insertion block. The pointed end of each clamping rod is inserted into the wiping cotton. A positioning rod is connected to one side of the push block, and one end of the positioning rod is movably inserted into a positioning groove on the fixed plate.

[0012] Preferably, the transmission structure includes a first rotating rod fixedly connected to one end of the second rotating rod, a second gear fixedly sleeved on one end of the first rotating rod that rotatably passes through the fixed cylinder, and a first gear fixedly sleeved on one end of the third rotating rod, wherein the first gear and the second gear are meshed together.

[0013] Preferably, the driving structure includes a second fixed frame fastened to the left side of the level gauge tube by bolts, a fixed rod fixedly passing through the second fixed frame near the level gauge tube, a second movable block movably sleeved on the fixed rod, a second vertical strip connected to the second movable block, a fixed strip movably passing through the second vertical strip near its top, one end of the fixed strip connected to another fixed plate, one end of the fixed strip fixedly passing through a third insert rod, a fixed plate connected to the inner wall of the second fixed frame, a wave groove formed on the fixed plate, and the bottom end of the third insert rod movably inserted into the wave groove.

[0014] Preferably, the air supply structure includes a second air supply pipe connected to a fixed cylinder. One end of the second air supply pipe is movably inserted into a first fixed frame. A longitudinal strip is connected between the inner walls of both ends of the first fixed frame. A first inner strip is fixedly connected between the longitudinal strip and the first fixed frame. One end of the second air supply pipe, which is fixedly inserted into the first inner strip, is connected to a flexible hose. A retractable structure is provided in the first fixed frame. One end of the flexible hose is connected to a second fixed pipe. A second inner strip is fixedly sleeved on one end of the second fixed pipe. A connecting strip is connected to the second inner strip. One end of the connecting strip is connected to a first movable block. The other end of the second fixed pipe is connected to an air outlet box. The air outlet box is fixedly inserted into an installation frame. Multiple air outlet holes are opened on the side of the air outlet box near the wiping cotton.

[0015] Preferably, the retractable structure includes multiple T-shaped rods that move through the longitudinal bar and the first fixed frame. Each T-shaped rod has a U-shaped seat installed at one end inserted into the first fixed frame. A retractable wheel is provided in the U-shaped seat. A second spring is sleeved on the T-shaped rod. One end of the second spring is connected to the end of the T-shaped rod that extends out of the first fixed frame. The flexible hose passes around the multiple retractable wheels.

[0016] In summary, the present invention has the following beneficial technical effects:

[0017] 1. This invention, by setting up an anti-frost structure, a moving structure, a cleaning structure, a transmission structure, and a driving structure, enables the blowing and wiping of the transparent protective plate under the action of the anti-frost structure, the moving structure, and the cleaning structure. In addition, with the transmission structure, the moving and wiping of the wiping cotton of the blowing and cleaning structure can be realized under the action of the same electric telescopic rod, which not only reduces the energy consumption of the work, but also reduces noise pollution. The driving structure can drive the wiping cotton to move back and forth along the width direction of the liquid level gauge tube when it moves back and forth along the length direction of the liquid level gauge tube, thereby improving the wiping effect on the transparent protective plate.

[0018] 2. The present invention, by setting a clamping structure, facilitates the installation or replacement of the wiping cotton in the installation frame;

[0019] 3. This invention features an air supply structure and a retraction structure. The air supply structure delivers a portion of the hot air used to blow away the transparent protective plate to the wiping cotton, preventing the wiping cotton from condensing during the wiping process and ensuring wiping quality. Furthermore, the retraction structure allows for flexible retraction of the hose according to the movement of the wiping cotton, preventing the hose from becoming tangled or broken. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an explosion-proof cryogenic level gauge according to an embodiment of the present invention;

[0021] Figure 2 This is an embodiment of the present invention. Figure 1 Enlarged view of the structure at point A;

[0022] Figure 3 This is a structural schematic diagram of the second fixed frame in an embodiment of the present invention;

[0023] Figure 4 This is an embodiment of the present invention. Figure 3 Enlarged view of the structure at point B;

[0024] Figure 5 This is a schematic diagram of the cleaning structure in an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the structure below the mounting frame in an embodiment of the present invention;

[0026] Figure 7 This is an embodiment of the present invention. Figure 6 Enlarged view of the structure at point C;

[0027] Figure 8 This is a schematic diagram of the internal structure of the fixed cylinder in an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached drawings: 1. Level gauge tube; 2. Flange; 3. Transparent protective plate; 4. U-shaped plate; 5. Fixed cylinder; 6. Electric telescopic rod; 7. First rotating rod; 8. Second rotating rod; 9. First spiral groove; 10. Moving disc; 11. Groove; 12. First insert rod; 13. Mounting sleeve; 14. Fan blade; 15. First air supply pipe; 16. First fixed frame; 17. Third rotating rod; 18. First moving block; 19. Second insert rod; 20. Second spiral groove; 21. First vertical bar; 22. Through bar; 23. Second fixed frame; 24. Fixed rod; 25. Second moving block; 26. Second vertical bar; 27. Fixed 28. Disc; 29. ​​Shaft; 30. Mounting plate; 31. Mounting frame; 32. Wiping cotton; 33. Positioning rod; 34. Press block; 35. Press rod; 36. Connecting piece; 37. Through groove; 38. Insertion block; 39. First spring; 40. First gear; 41. Second gear; 42. Fixing strip; 43. Third insertion rod; 44. Fixing plate; 45. Wave groove; 46. Second air supply pipe; 47. First inner strip; 48. Second inner strip; 49. Second fixing pipe; 50. Air outlet box; 51. Connecting strip; 52. Flexible hose; 53. T-shaped rod; 54. Second spring; 55. Longitudinal bar; 56. Retractable wheel; 57. U-shaped seat. Detailed Implementation

[0029] The following is in conjunction with the appendix Figures 1-8 The present invention will be described in further detail below.

[0030] Reference Figures 1-8This invention discloses an explosion-proof cryogenic liquid level gauge, including a liquid level gauge tube 1, a flange 2 and a transparent protective plate 3. The flange 2 is provided at one end of the liquid level gauge tube 1, the transparent protective plate 3 is installed at the scale on the liquid level gauge tube 1, a movable structure is provided on the right side of the liquid level gauge tube 1, and an anti-frost structure is provided at the other end of the liquid level gauge tube 1.

[0031] The anti-frost structure includes a U-shaped plate 4 fastened to the other end of the level gauge tube 1 by bolts, a fixed cylinder 5 fixedly installed in the middle of the inner wall of the U-shaped plate 4, a heating mesh set on the inner wall of the fixed cylinder 5 near the level gauge tube 1, a second rotating rod 8 rotatably connected to the inner wall of the fixed cylinder 5 away from the level gauge tube 1, a first spiral groove 9 opened on the second rotating rod 8, a movable disk 10 movably sleeved on the second rotating rod 8, a groove 11 opened on the side of the movable disk 10, a first insert rod 12 fixedly inserted into the groove 11, one end of the first insert rod 12 movably inserted into the first spiral groove 9, an electric telescopic rod 6 installed on the U-shaped plate 4, one end of the output shaft of the electric telescopic rod 6 connected to the movable disk 10, an installation sleeve 13 fixedly sleeved on the upper end of the second rotating rod 8, a fan blade 14 set on the installation sleeve 13, a first air supply pipe 15 connected to one end of the fixed cylinder 5, and one end of the first air supply pipe 15 extending to the space between the transparent protective plate 3 and the scale.

[0032] The movable structure includes a first fixed frame 16 installed on the right side of the level gauge tube 1. A third rotating rod 17 rotates through the first fixed frame 16 near the level gauge tube 1. A first movable block 18 is sleeved on the third rotating rod 17. A second insert rod 19 is fixedly inserted into the first movable block 18. A second spiral groove 20 is opened on the third rotating rod 17. One end of the second insert rod 19 is movably inserted into the second spiral groove 20. A first vertical bar 21 is connected to the first movable block 18. A through bar 22 movably passes through the top of the first vertical bar 21. A cleaning structure is provided at one end of the through bar 22. A transmission structure is provided between the third rotating rod 17 and the second rotating rod 18. A driving structure is provided on the left side of the level gauge tube 1.

[0033] The cleaning structure includes two fixed plates 27 set at one end of the through strip 22. A rotating shaft 28 is rotatably connected between the two fixed plates 27. One of the fixed plates 27 is fixedly installed on the through strip 22. An installation plate 29 is fixedly sleeved on the rotating shaft 28. An installation frame 30 is fastened to the underside of the installation plate 29 by bolts. A wiping cotton 31 is set in the installation frame 30 by a clamping structure. An air supply structure is set between the installation frame 30 and the fixed cylinder 5.

[0034] The driving structure includes a second fixed frame 23 fastened to the left side of the level gauge tube 1 by bolts. A fixed rod 24 is fixedly passed through the second fixed frame 23 near the level gauge tube 1. A second moving block 25 is movably sleeved on the fixed rod 24. A second vertical bar 26 is connected to the second moving block 25. A fixed bar 41 is movably passed through the second vertical bar 26 near the top. One end of the fixed bar 41 is connected to another fixed plate 27. One end of the fixed bar 41 is fixedly passed through a third insert rod 42. A fixed plate 43 is connected to the inner wall of the second fixed frame 23. A wave groove 44 is opened on the fixed plate 43. The bottom end of the third insert rod 42 is movably inserted into the wave groove 44.

[0035] The transmission structure includes a first rotating rod 7 fixedly connected to one end of the second rotating rod 8. A second gear 40 is fixedly sleeved on one end of the first rotating rod 7 that rotatably passes through the fixed cylinder 5. A first gear 39 is fixedly sleeved on one end of the third rotating rod 17. The first gear 39 and the second gear 40 are meshed together. When the electric telescopic rod 6 on the U-shaped plate 4 drives the moving disk 10 to move back and forth on the second rotating rod 8, it drives one end of the first insert rod 12 to slide back and forth in the first spiral groove 9 on the second rotating rod 8, thereby driving the second rotating rod 8 and the fan blade 14 to rotate as a whole. This allows the warm air heated by the heating grid to be sent from the first air supply pipe 15 into the transparent protective plate 3, where it is automatically purged to prevent frost from forming inside the transparent protective plate 3. At the same time, the second rotating rod 8 drives the first rotating rod 7 to rotate, through the first... Gear 39 and gear 40 drive the third rotating rod 17 to rotate. One end of the second insert rod 19 slides in the second spiral groove 20 on the third rotating rod 17, thereby automatically driving the first moving block 18 to move on the third rotating rod 17. This causes the wiping cotton 31 on the mounting frame 30 to move and adhere to the transparent protective plate 3, thus wiping and cleaning the transparent protective plate 3. When the mounting frame 30 moves, it drives one end of the third insert rod 42 at one end of the fixing strip 41 to slide in the wave groove 44 of the fixing plate 43. As the mounting frame 30 moves back and forth along the length of the transparent protective plate 3, it also drives the mounting frame 30 and the wiping cotton 31 to move back and forth along the width of the transparent protective plate 3, making the transparent protective plate 3 cleaner and the level gauge display clearer.

[0036] See Figures 5-7The clamping structure includes two push rods 34 that move through the mounting frame 30. One end of each push rod 34 is connected to a push block 33, and the other end is connected to a connecting piece 35. A first spring 38 is fitted on one end of each push rod 34 near the connecting piece 35. The two ends of the first spring 38 are connected to the mounting frame 30 and the connecting piece 35, respectively. Both sides of the mounting frame 30 have through slots 36, and an insert block 37 is movably inserted into each through slot 36. One end of the connecting piece 35 is connected to the insert block 37. Multiple clamping rods are connected to the inner side of the insert block 37, and the pointed end of each clamping rod is inserted into the wiping cotton 31. A positioning rod 32 is connected to one side of block 33. One end of the positioning rod 32 is movably inserted into the positioning groove on the fixed plate 27. When the wiping cotton 31 needs to be replaced, after the mounting frame 30 is moved out from above the transparent protective plate 3, the two pressing blocks 33 are pressed towards the middle, which drives the insertion rod on the insertion block 37 to be pulled out from the wiping cotton 31. The pressing block 33 also drives the positioning rod 32 to be pulled out from the positioning groove of the fixed plate 27, releasing the positioning of the mounting frame 30 on the fixed plate 27. Thus, the mounting frame 30 is rotated upward with the rotating shaft 28 as the axis, which facilitates the replacement of the wiping cotton 31.

[0037] See Figure 1 , Figure 2 , Figure 5 , Figure 6 and Figure 7 The air supply structure includes a second air supply pipe 45 connected to the fixed cylinder 5. One end of the second air supply pipe 45 is movably inserted into the first fixed frame 16. A longitudinal strip 54 is connected between the inner walls of both ends of the first fixed frame 16. A first inner strip 46 is fixedly connected between the longitudinal strip 54 and the first fixed frame 16. One end of the second air supply pipe 45, which is fixedly inserted into the first inner strip 46, is connected to a flexible hose 51. A retractable structure is provided in the first fixed frame 16. One end of the flexible hose 51 is connected to a second fixed pipe 48. A second inner strip 47 is fixedly sleeved on one end of the second fixed pipe 48. A connecting strip 50 is connected to the second inner strip 47. One end of the connecting strip 50 is connected to the first moving block 18. The other end of the second fixed pipe 48 is connected to an air outlet box 49. The air outlet box 49 is fixedly inserted into the mounting frame 30. Multiple air outlet holes are opened on the side of the air outlet box 49 near the wiping cotton 31.

[0038] The retractable structure includes multiple T-shaped rods 52 that move through the longitudinal bar 54 and the first fixed frame 16. Each T-shaped rod 52 has a U-shaped seat 56 installed at one end when it is inserted into the first fixed frame 16. A retractable wheel 55 is installed in the U-shaped seat 56. A second spring 53 is sleeved on the T-shaped rod 52. One end of the second spring 53 is connected to the end of the T-shaped rod 52 that is inserted out of the first fixed frame 16. A flexible hose 51 passes around the multiple retractable wheels 55. The warm air generated in the fixed cylinder 5 is delivered to the wiping cotton 31 by the second air supply pipe 45, the flexible hose 51, and the second fixed pipe 48 to prevent condensation on the wiping cotton 31. To ensure the wiping quality of the wiping cotton 31, when the mounting frame 30 moves away from the U-shaped plate 4, the hose 51 is pulled, which drives the T-shaped rod 52 to move into the first fixed frame 16 to release the hose 51 reserved in the first fixed frame 16. At the same time, when the mounting frame 30 moves in the opposite direction, the tension on the hose 51 decreases. Under the elastic force of the second spring 53, the T-shaped rod 52 is pushed to move in the opposite direction. Thus, while the mounting frame 30 moves, the hose 51 is correspondingly retracted and extended, avoiding the problem of the hose 51 being tangled and torn due to the back and forth movement of the mounting frame 30.

[0039] The implementation principle of an explosion-proof cryogenic level gauge according to an embodiment of the present invention is as follows: First, when the electric telescopic rod 6 on the U-shaped plate 4 drives the moving disk 10 to move back and forth on the second rotating rod 8, it drives one end of the first insertion rod 12 to slide back and forth in the first spiral groove 9 on the second rotating rod 8, thereby driving the second rotating rod 8 and the fan blade 14 to rotate as a whole. This allows the warm air heated by the heating grid to be sent from the first air supply pipe 15 into the transparent protective plate 3, where it is automatically purged to prevent frost from forming inside the transparent protective plate 3. At the same time, the second rotating rod... 8 drives the first rotating rod 7 to rotate, which in turn drives the third rotating rod 17 to rotate via the first gear 39 and the second gear 40. One end of the second insert rod 19 slides in the second spiral groove 20 on the third rotating rod 17, automatically driving the first moving block 18 to move on the third rotating rod 17. This causes the wiping cotton 31 on the mounting frame 30 to move and adhere to the transparent protective plate 3, thus wiping and cleaning the transparent protective plate 3. Furthermore, as the mounting frame 30 moves, it drives one end of the third insert rod 42 at one end of the fixing strip 41 to move in the wave groove 44 of the fixing plate 43. The mounting frame 30 slides along the length of the transparent protective plate 3, causing the mounting frame 30 and the wiping cotton 31 to reciprocate along the width of the transparent protective plate 3. This results in a cleaner wipe of the transparent protective plate 3 and a clearer display of the level gauge. Furthermore, the warm air generated inside the fixed cylinder 5 is delivered to the wiping cotton 31 via the second air supply pipe 45, the flexible hose 51, and the second fixed pipe 48, preventing condensation on the wiping cotton 31 and ensuring the wiping quality. The mounting frame 30 moves away from the U-shaped... When plate 4 moves in one direction, it pulls the hose 51, causing the T-shaped rod 52 to move towards the first fixed frame 16, thereby releasing the hose 51 that was previously placed in the first fixed frame 16. At the same time, when the mounting frame 30 moves in the opposite direction, the tension on the hose 51 decreases. Under the elastic force of the second spring 53, the T-shaped rod 52 is pushed to move in the opposite direction. Thus, while the mounting frame 30 moves, the hose 51 is retracted and extended accordingly, avoiding the problem of the hose 51 being tangled and broken due to the back-and-forth movement of the mounting frame 30. The structure is simple and the function is practical.

[0040] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An explosion-proof cryogenic liquid level gauge comprising a liquid level gauge tube (1), a flange plate (2) and a transparent protective plate (3), characterized in that: The liquid level gauge pipe (1) one end is provided with flange (2), the liquid level gauge pipe (1) upper face scale disc is installed transparent protective plate (3), the liquid level gauge pipe (1) right side is provided with mobile structure, the liquid level gauge pipe (1) the other end is provided with anti-frost structure; The anti-frost structure includes the U-shaped plate (4) that is fastened on the other end of the liquid level gauge pipe (1) through bolt, the fixed cylinder (5) is fixedly installed in the middle of the inner wall of the U-shaped plate (4), the heating net is arranged on the inner wall of the one end of the fixed cylinder (5) close to the liquid level gauge pipe (1), the second rotating rod (8) is rotatably connected on the inner wall of the one end of the fixed cylinder (5) away from the liquid level gauge pipe (1), the first helical groove (9) is formed in the second rotating rod (8), the mobile disc (10) is movably sleeved on the second rotating rod (8), the recess (11) is formed in the side of the mobile disc (10), the first inserting rod (12) is fixedly inserted into the recess (11), the one end of the first inserting rod (12) is movably inserted into the first helical groove (9), the electric telescopic rod (6) is installed on the U-shaped plate (4), the output shaft one end of the electric telescopic rod (6) is connected on the mobile disc (10), the mounting sleeve (13) is fixedly sleeved on the one end of the second rotating rod (8), the fan blade (14) is arranged on the mounting sleeve (13), the first air supply pipe (15) is connected on the one end of the fixed cylinder (5), the one end of the first air supply pipe (15) extends to the position between the transparent protective plate (3) and the scale disc. The mobile structure includes the first fixed frame (16) installed on the right side of the liquid level gauge pipe (1), the third rotating rod (17) is rotatably penetrated through the first fixed frame (16) close to the liquid level gauge pipe (1), the first moving block (18) is sleeved on the third rotating rod (17), the second inserting rod (19) is fixedly inserted into the first moving block (18), the second helical groove (20) is formed in the third rotating rod (17), the one end of the second inserting rod (19) is movably inserted into the second helical groove (20), the first vertical bar (21) is connected on the upper surface of the first moving block (18), the penetrating bar (22) is movably penetrated through the top end of the first vertical bar (21), the cleaning structure is arranged on the one end of the penetrating bar (22), the transmission structure is arranged between the third rotating rod (17) and the second rotating rod (8), the driving structure is arranged on the left side of the liquid level gauge pipe (1).

2. A low temperature level gauge according to claim 1, wherein: The cleaning structure includes two fixed discs (27) arranged on the one end of the penetrating bar (22), a rotating shaft (28) is rotatably connected between the two fixed discs (27), one of the fixed discs (27) is fixedly installed on the penetrating bar (22), the mounting plate (29) is fixedly sleeved on the rotating shaft (28), the frame (30) is fastened and installed on the lower surface of the mounting plate (29) through bolt, the wiping cotton (31) is arranged in the frame (30) through plug-in structure, the air supply structure is arranged between the frame (30) and the fixed cylinder (5).

3. A low temperature level gauge according to claim 2, wherein: The plug-in structure comprises two pressing rods (34) movably penetrating the mounting frame (30), one end of the pressing rod (34) is connected with a pressing block (33), the other end of the pressing rod (34) is connected with a connecting sheet (35), a first spring (38) is sleeved on the pressing rod (34) near one end of the connecting sheet (35), two ends of the first spring (38) are connected with the mounting frame (30) and the connecting sheet (35) respectively, a through slot (36) is formed on each side surface of the mounting frame (30), an insertion block (37) is movably inserted into each through slot (36), one end of the connecting sheet (35) is connected with the insertion block (37), a plurality of plug-in rods are connected on the inner side surface of the insertion block (37), one end of the plug-in rod with a pointed end is inserted into the wiping cotton (31), a positioning rod (32) is connected on one side surface of the pressing block (33), one end of the positioning rod (32) is movably inserted into a positioning slot formed on the fixing disc (27).

4. The intrinsically safe low temperature liquid level meter of claim 1, wherein: The transmission structure comprises a first rotating rod (7) fixedly connected on one end of a second rotating rod (8), a second gear (40) is fixedly sleeved on one end of the first rotating rod (7) penetrating out of the fixing cylinder (5), a first gear (39) is fixedly sleeved on one end of the third rotating rod (17), the first gear (39) and the second gear (40) are in meshing connection.

5. The intrinsically safe low temperature liquid level meter of claim 1, wherein: The driving structure comprises a second fixing frame (23) fastened on the left side surface of the liquid level meter pipe (1) through bolts, a fixing rod (24) is fixedly penetrated on the second fixing frame (23) near the liquid level meter pipe (1), a second moving block (25) is movably sleeved on the fixing rod (24), a second vertical bar (26) is connected on the upper surface of the second moving block (25), a fixing bar (41) is movably penetrated on the second vertical bar (26) near the top end, the other end of the fixing bar (41) is connected with another fixing disc (27), the fixing bar (41) is fixedly penetrated with a third insertion rod (42), a fixing plate (43) is connected on the inner wall of the second fixing frame (23), a wave-shaped slot (44) is formed on the fixing plate (43), the bottom end of the third insertion rod (42) is movably inserted into the wave-shaped slot (44).

6. A low temperature level gauge according to claim 2, wherein: The air supply structure comprises a second air supply pipe (45) connected to the fixed cylinder (5), one end of the second air supply pipe (45) is movably inserted into the first fixed frame (16), longitudinal strips (54) are connected between the inner walls of the two ends of the first fixed frame (16), first inner strips (46) are fixedly connected between the longitudinal strips (54) and the first fixed frame (16), a hose (51) is connected to one end of the first inner strip (46) into which the second air supply pipe (45) is fixedly inserted, a winding and unwinding structure is arranged in the first fixed frame (16), one end of the hose (51) is communicated with a second fixed pipe (48), a second inner strip (47) is fixedly sleeved on one end of the second fixed pipe (48), a connecting strip (50) is connected to the second inner strip (47), one end of the connecting strip (50) is connected to the first moving block (18), the other end of the second fixed pipe (48) is communicated with an air outlet box (49), the air outlet box (49) is fixedly inserted into the mounting frame (30), a plurality of air outlet holes are formed in the side surface of the air outlet box (49) close to the wiping cotton (31).

7. A low temperature level gauge according to claim 6, wherein: The winding and unwinding structure comprises a plurality of T-shaped rods (52) movably penetrating through the longitudinal strips (54) and the first fixed frame (16), a U-shaped seat (56) is mounted on one end of each T-shaped rod (52) inserted into the first fixed frame (16), a winding and unwinding wheel (55) is arranged in the U-shaped seat (56), a second spring (53) is sleeved on the T-shaped rod (52), one end of the second spring (53) is connected to the end of the T-shaped rod (52) penetrating out of the first fixed frame (16), and the hose (51) is wound around the plurality of winding and unwinding wheels (55) respectively.

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