Anti-explosion low-temperature liquid level meter

Abstract

The invention relates to the field of liquid level meters, and discloses an anti-explosion low-temperature liquid level meter which comprises a liquid level meter pipe, a flange plate and a transparent protection plate, the flange plate is arranged at one end of the liquid level meter pipe, the transparent protection plate is installed at a dial on the liquid level meter pipe, and a moving structure is arranged on the right side face of the liquid level meter pipe. The anti-frosting structure is arranged at the other end of the liquid level meter pipe, under the action of the anti-frosting structure, the moving structure and the cleaning structure, purging and wiping work of the transparent protection plate can be achieved, in cooperation with the transmission structure, the moving wiping work of wiping cotton of the purging and cleaning structure can be achieved only under the action of the same electric telescopic rod, and the wiping efficiency is improved. Not only is the working energy consumption lower, but also the noise pollution is reduced; and by arranging the driving structure, when the wiping cotton moves back and forth in the length direction of the liquid level meter pipe, the wiping cotton is driven to move back and forth in the width direction of the liquid level meter pipe, and the wiping effect on the transparent protection plate is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid level gauges, in particular to an explosion-proof low-temperature liquid level gauge. Background Art

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

[0003] In the prior art, explosion-proof low-temperature liquid level gauges are provided with a guide tube, and a motor drives the fan blades to rotate to generate wind. The wind is blown out of the guide tube through the opening of the housing, which has a certain cleaning effect on the transparent protective plate, thereby preventing the occurrence of ice and frost, making the display effect of the liquid level gauge indicator panel clearer; and the electric push rod drives the sponge pad to move along the slide groove to wipe off the frost on the surface of the transparent protective plate, further improving the display effect of the indicator panel;

[0004] However, in actual use, it is necessary to start the motor and the electric push rod separately to realize the blowing and wiping of the transparent protective plate. This not only increases the working energy consumption, but also generates noise during the operation of the motor, causing noise pollution. Therefore, there is room for improvement. Summary of the Invention

[0005] In order to solve the problems raised in the above background technology, the present invention provides an explosion-proof low-temperature liquid level gauge.

[0006] The present invention provides an explosion-proof low-temperature liquid level gauge that adopts the following technical solutions:

[0007] An explosion-proof low-temperature liquid level gauge, comprising 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 plate 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 liquid 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 net is provided on the inner wall of the fixed cylinder close to one end of the liquid level gauge tube, and the fixed cylinder is rotatably connected to the second rotating rod on the inner wall away from one end of the liquid level gauge tube, a first spiral groove is provided on the second rotating rod, a movable disk is movably mounted on the second rotating rod, a groove is provided on the side of the movable disk, a first plug rod is fixedly inserted into the groove, and one end of the first plug 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, a mounting sleeve is fixedly mounted at the upper end of the second rotating rod, and fan blades are provided on the mounting sleeve, one end of the fixed cylinder is connected to the first air supply pipe, and one end of the first air supply pipe extends 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 liquid level gauge tube, the first fixed frame rotates and passes through the third rotating rod near the liquid level gauge tube, the first movable block is sleeved on the third rotating rod, the first movable block is fixedly inserted into the second insertion rod, a second spiral groove is provided on the third rotating rod, one end of the second insertion rod is movably inserted into the second spiral groove, the first movable block is connected to the first vertical bar, the top of the first vertical bar movably passes through the through bar, a cleaning structure is provided at one end of the through bar, a transmission structure is provided between the third rotating rod and the second rotating rod, and a driving structure is provided on the left side of the liquid level gauge tube.

[0010] Preferably, the cleaning structure includes two fixed disks arranged at one end of the through-bar, and a rotating shaft is rotatably connected between the two fixed disks. One of the fixed disks is fixedly mounted on the through-bar, and a mounting plate is fixedly sleeved on the rotating shaft. The mounting plate is fastened to the mounting frame by bolts under the mounting plate, and a wiping cotton is arranged in the mounting frame by a tightening structure, and an air supply structure is arranged between the mounting frame and the fixed cylinder.

[0011] Preferably, the tightening structure includes two pressing rods that movably pass through the mounting frame, one end of the pressing rod is connected to the pressing block, and the other end of the pressing rod is connected to a connecting piece, a first spring is sleeved on the pressing rod near one end of the connecting piece, and the two ends of the first spring are respectively connected to the mounting frame and the connecting piece, and through slots are provided on both side surfaces of the mounting frame, and an insertion block is movably inserted into each of the through slots, one end of the connecting piece is connected to the insertion block, and a plurality of tightening rods are connected to the inner side surface of the insertion block, and the pointed end of the tightening rod is inserted into the wiping cotton, and a positioning rod is connected to one side surface of the pressing block, and one end of the positioning rod is movably inserted into the positioning slot provided on the fixed disk.

[0012] Preferably, the transmission structure includes a first rotating rod fixedly connected to one end of the second rotating rod, a second gear is fixedly sleeved on one end of the first rotating rod that rotates to pass through the fixed cylinder, and a first gear is fixedly sleeved on one end of the third rotating rod, and the first gear is meshed with the second gear.

[0013] Preferably, the driving structure includes a second fixed frame fastened to the left side of the liquid level gauge tube by bolts, a fixed rod is fixed through the second fixed frame near the side of the liquid level gauge tube, a second movable block is movably mounted on the fixed rod, the second movable block is connected to a second vertical bar, a fixed bar is movably passed through the second vertical bar near the top, one end of the fixed bar is connected to another fixed plate, one end of the fixed bar is fixed through the third insertion rod, a fixed plate is connected to the inner wall of the second fixed frame, a corrugated groove is provided on the fixed plate, and the bottom end of the third insertion rod is movably inserted into the corrugated groove.

[0014] Preferably, the air supply structure includes a second air supply pipe connected to the fixed cylinder, one end of the second air supply pipe is movably inserted into the first fixed frame, a longitudinal bar is connected between the inner walls at both ends of the first fixed frame, the longitudinal bar is fixedly connected to the first inner bar, one end of the second air supply pipe is fixedly inserted into the first inner bar and is connected to a hose, a retractable structure is provided in the first fixed frame, one end of the hose is connected to the second fixed pipe, a second inner bar is fixedly sleeved on one end of the second fixed pipe, a connecting bar is connected to the second inner bar, one end of the connecting bar is connected to the first movable block, the other end of the second fixed pipe is connected to the air outlet box, the air outlet box is fixedly inserted into the installation frame, and a plurality of air outlet holes are provided on a side of the air outlet box close to the wiping cotton.

[0015] Preferably, the retractable structure includes multiple T-shaped rods that movably pass through the longitudinal bars and the first fixed frame, and each of the T-shaped rods is installed with a U-shaped seat on one end inserted into the first fixed frame, and a retractable wheel is provided in the U-shaped seat. A second spring is sleeved on the T-shaped rod, and one end of the second spring is connected to the end of the T-shaped rod that passes through the first fixed frame, and the hose passes around multiple retractable wheels respectively.

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

[0017] 1. The present invention is provided with an anti-frost structure, a moving structure, a cleaning structure, a transmission structure, and a driving structure. Under the action of the anti-frost structure, the moving structure, and the cleaning structure, the transparent protective plate can be blown and wiped. In addition, in conjunction with the transmission structure, the blowing and the moving and wiping of the cleaning structure wiping cotton can be achieved under the action of the same electric telescopic rod, which not only reduces working energy consumption but also reduces noise pollution. The setting of the driving structure can drive the wiping cotton to move back and forth along the width direction of the liquid level gauge tube when the wiping cotton moves back and forth along the length direction of the liquid level gauge tube, thereby improving the wiping effect of the transparent protective plate.

[0018] 2. The present invention facilitates installation or replacement of the wiping cotton in the installation frame by providing a plug-in structure;

[0019] 3. The present invention provides an air supply structure and a retractable structure. The air supply structure delivers part of the hot air used to blow the transparent protective plate to the wiping cotton, thereby avoiding the frost on the wiping cotton during the wiping process and ensuring the wiping quality. The retractable structure can flexibly retract and extend the hose according to the moving position of the wiping cotton, thereby avoiding the problem of the hose being entangled and torn. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 2 In the embodiment of the present invention Figure 1 A magnified view of the structure at point A;

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

[0023] Figure 4 In the embodiment of the present invention Figure 3 A magnified view of the structure at point B;

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

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

[0026] Figure 7 In the embodiment of the present invention Figure 6 A magnified view of the structure at point C;

[0027] Figure 8 2 is a schematic diagram of the structure inside the fixed cylinder in an embodiment of the present invention.

[0028] Explanation of the reference numerals: 1. Liquid 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 plate; 11. Groove; 12. First plug rod; 13. Mounting sleeve; 14. Fan blade; 15. First air supply pipe; 16. First fixing frame; 17. Third rotating rod; 18. First moving block; 19. Second plug rod; 20. Second spiral groove; 21. First vertical bar; 22. Through bar; 23. Second fixing frame; 24. Fixed rod; 25. Second moving block; 26. Second vertical bar; 27. Fixed Disc; 28. Rotating shaft; 29. ​​Mounting plate; 30. Mounting frame; 31. Wiping cotton; 32. Positioning rod; 33. Press block; 34. Press rod; 35. Connecting piece; 36. Through slot; 37. Insert block; 38. First spring; 39. First gear; 40. Second gear; 41. Fixing bar; 42. Third inserting rod; 43. Fixing plate; 44. Corrugated groove; 45. Second air supply pipe; 46. First inner bar; 47. Second inner bar; 48. Second fixing pipe; 49. Air outlet box; 50. Connecting bar; 51. Hose; 52. T-bar; 53. Second spring; 54. Longitudinal bar; 55. Retractable wheel; 56. U-shaped seat. DETAILED DESCRIPTION

[0029] The following is combined with Figures 1-8 The present invention is described in further detail.

[0030] Reference Figures 1-8The embodiment of the present invention discloses an explosion-proof low-temperature liquid level gauge, comprising 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 on the scale plate 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 liquid level gauge tube 1 by bolts, a fixed cylinder 5 is fixedly installed in the middle of the inner wall of the U-shaped plate 4, a heating network is provided on the inner wall of the fixed cylinder 5 close to the end of the liquid level gauge tube 1, and the fixed cylinder 5 is rotatably connected to the inner wall of the end away from the liquid level gauge tube 1. The second rotating rod 8 is provided with a first spiral groove 9, and a movable disk 10 is movably sleeved on the second rotating rod 8. A groove 11 is provided on the side of the movable disk 10, and a first insertion rod 12 is fixedly inserted into the groove 11. One end of the first insertion rod 12 is movably inserted into the first spiral groove 9. An electric telescopic rod 6 is installed on the U-shaped plate 4, and one end of the output shaft of the electric telescopic rod 6 is connected to the movable disk 10. A mounting sleeve 13 is fixedly sleeved at the upper end of the second rotating rod 8, and a fan blade 14 is provided on the mounting sleeve 13. One end of the fixed cylinder 5 is connected to the first air supply pipe 15, and one end of the first air supply pipe 15 extends to between the transparent protective plate 3 and the dial;

[0032] The movable structure includes a first fixed frame 16 installed on the right side of the liquid level gauge tube 1, and a third rotating rod 17 is rotated and passed through the first fixed frame 16 near the liquid level gauge tube 1. A first movable block 18 is sleeved on the third rotating rod 17, and a second insertion rod 19 is fixedly inserted into the first movable block 18. A second spiral groove 20 is provided on the third rotating rod 17, and one end of the second insertion rod 19 is movably inserted into the second spiral groove 20. A first vertical bar 21 is connected to the first movable block 18, and the top of the first vertical bar 21 movably passes through a penetration bar 22. A cleaning structure is provided at one end of the penetration bar 22. A transmission structure is provided between the third rotating rod 17 and the second rotating rod 8, and a driving structure is provided on the left side of the liquid level gauge tube 1;

[0033] The cleaning structure includes two fixed disks 27 provided at one end of the penetration strip 22. A rotating shaft 28 is rotatably connected between the two fixed disks 27. One of the fixed disks 27 is fixedly mounted on the penetration strip 22. A mounting plate 29 is fixedly sleeved on the rotating shaft 28. A mounting frame 30 is fastened to the bottom of the mounting plate 29 by bolts. A wiping cotton 31 is provided in the mounting frame 30 by an insertion structure. An air supply structure is provided between the mounting frame 30 and the fixed cylinder 5.

[0034] The driving structure includes a second fixed frame 23 fastened to the left side of the liquid level gauge tube 1 by bolts, a fixed rod 24 is fixedly passed through the second fixed frame 23 near the side of the liquid level gauge tube 1, a second movable block 25 is movably sleeved on the fixed rod 24, a second vertical bar 26 is connected to the second movable 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 the third insertion rod 42, a fixed plate 43 is connected to the inner wall of the second fixed frame 23, a corrugated groove 44 is provided on the fixed plate 43, and the bottom end of the third insertion rod 42 is movably inserted into the corrugated groove 44;

[0035] The transmission structure includes a first rotating rod 7 fixedly connected to one end of the second rotating rod 8, and the first rotating rod 7 rotates to pass through the end of the fixed cylinder 5 and is fixedly sleeved with a second gear 40, and the first gear 39 is fixedly sleeved on one end of the third rotating rod 17, and the first gear 39 is meshed with the second gear 40. When the electric telescopic rod 6 on the U-shaped plate 4 is started to drive the movable disk 10 to move back and forth on the second rotating rod 8, it drives one end of the first plug 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, so that the warm air heated by the heating network is sent from the first air supply pipe 15 to the transparent protective plate 3, and is automatically purged in the transparent protective plate 3 to avoid the problem of frost in the transparent protective plate 3. At the same time, the second rotating rod 8 drives the first rotating rod 7 to rotate, and through the first air supply pipe 15 A gear 39 and a second gear 40 drive the third rotating rod 17 to rotate, and one end of the second plug 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, to drive the wiping cotton 31 on the mounting frame 30 to move close to the transparent protective plate 3, to wipe and clean the transparent protective plate 3, and when the mounting frame 30 moves, it drives one end of the third plug rod 42 at one end of the fixing bar 41 to slide in the corrugated groove 44 of the fixing plate 43, so that when the mounting frame 30 moves back and forth along the length direction of the transparent protective plate 3, it drives the mounting frame 30 and the wiping cotton 31 as a whole to reciprocate back and forth along the width direction of the transparent protective plate 3, so that the transparent protective plate 3 is wiped more cleanly and the liquid level gauge is displayed more clearly.

[0036] See also Figure 5-Figure 7The plug-in structure includes two push rods 34 that move through the mounting frame 30. One end of the push rod 34 is connected to the push block 33, and the other end of the push rod 34 is connected to a connecting piece 35. A first spring 38 is sleeved on the push rod 34 near one end of the connecting piece 35. The two ends of the first spring 38 are respectively connected to the mounting frame 30 and the connecting piece 35. Through slots 36 are provided on both sides of the mounting frame 30. An insertion block 37 is movably inserted into each through slot 36. One end of the connecting piece 35 is connected to the insertion block 37. A plurality of tightening rods are connected to the inner side of the insertion block 37. The pointed end of the tightening rod is inserted into the wiping cotton 31. The block 33 is connected to a positioning rod 32 on one side, and one end of the positioning rod 32 is movably inserted into the positioning groove provided on the fixed disk 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 toward the middle, driving the tightening rod on the insertion block 37 to be pulled out from the wiping cotton 31, and the pressing block 33 drives the positioning rod 32 to be pulled out from the positioning groove of the fixed disk 27, releasing the positioning of the mounting frame 30 on the fixed disk 27, thereby rotating the mounting frame 30 upward with the rotating shaft 28 as the axis, facilitating the replacement of the wiping cotton 31.

[0037] See also 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 bar 54 is connected between the inner walls of the two ends of the first fixed frame 16, and the first inner bar 46 is fixedly connected between the longitudinal bar 54 and the first fixed frame 16. One end of the second air supply pipe 45 is fixedly inserted into the first inner bar 46 and connected to a hose 51, and a retractable structure is provided in the first fixed frame 16, one end of the hose 51 is connected to the second fixed pipe 48, and the second inner bar 47 is fixedly sleeved on one end of the second fixed pipe 48. The second inner bar 47 is connected to a connecting bar 50, one end of the connecting bar 50 is connected to the first movable block 18, and the other end of the second fixed pipe 48 is connected to the air outlet box 49, which is fixedly inserted into the mounting frame 30. The air outlet box 49 has a plurality of air outlet holes on a side close to the wiping cotton 31;

[0038] The retractable structure includes a plurality of T-shaped rods 52 that are movable through the longitudinal bars 54 and the first fixed frame 16. A U-shaped seat 56 is installed on one end of each T-shaped rod 52 inserted into the first fixed frame 16. A retractable wheel 55 is set 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 passes through the first fixed frame 16. The hose 51 passes around the plurality of retractable wheels 55 respectively. The warm air generated in the fixed cylinder 5 is sent to the wiping cotton 31 by the second air supply pipe 45, the hose 51 and the second fixed pipe 48 to prevent the wiping cotton 31 from frost. , to ensure the wiping quality of the wiping cotton 31, when the mounting frame 30 moves in the direction away from the U-shaped plate 4, the hose 51 is pulled, driving the T-shaped rod 52 to move toward 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 is reduced, and under the elastic force of the second spring 53, the T-shaped rod 52 is pushed to move in the opposite direction, so that the hose 51 is correspondingly retracted and released while the mounting frame 30 moves, avoiding the problem of the hose 51 being entangled and torn off due to the back and forth movement of the mounting frame 30.

[0039] The implementation principle of an explosion-proof low-temperature liquid level gauge according to an embodiment of the present invention is as follows: first, the electric telescopic rod 6 on the U-shaped plate 4 is started to drive the movable plate 10 to move back and forth on the second rotating rod 8, thereby driving one end of the first plug 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, so that the warm air heated by the heating network is sent from the first air supply pipe 15 to the transparent protective plate 3, and automatically purged in the transparent protective plate 3 to avoid the problem of frost condensation in the transparent protective plate 3. At the same time, the second rotating rod 8 drives the first rotating rod 7 to rotate, and drives the third rotating rod 17 to rotate through the first gear 39 and the second gear 40, and uses one end of the second plug rod 19 to slide 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, thereby driving the wiping cotton 31 on the mounting frame 30 to move close to the transparent protective plate 3, and playing the role of wiping and cleaning the transparent protective plate 3, and when the mounting frame 30 moves, it drives one end of the third plug rod 42 at one end of the fixing bar 41 to slide in the corrugated groove 44 of the fixing plate 43. The wiping cotton 31 is moved back and forth along the width direction of the transparent protective plate 3 by the mounting frame 30, so that the mounting frame 30 and the wiping cotton 31 are moved back and forth along the width direction of the transparent protective plate 3 as a whole, so that the transparent protective plate 3 is wiped more cleanly and the liquid level gauge is displayed more clearly. In addition, the warm air generated in the fixed cylinder 5 is sent to the wiping cotton 31 by the second air supply pipe 45, the hose 51 and the second fixed pipe 48 to avoid frost on the wiping cotton 31 and ensure the wiping quality of the wiping cotton 31. The mounting frame 30 moves away from the U-shaped When the plate 4 moves in the direction of rotation, the hose 51 is pulled, driving the T-shaped rod 52 to move toward 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 reverse direction, the tension on the hose 51 is reduced. Under the elastic force of the second spring 53, the T-shaped rod 52 is pushed to move in the reverse direction. As a result, when the mounting frame 30 moves, the hose 51 is correspondingly retracted and released, avoiding the problem of the hose 51 being entangled and torn off 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, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. An explosion-proof low-temperature liquid level gauge, comprising a liquid level gauge tube (1), a flange (2) and a transparent protective plate (3), characterized in that: A flange (2) is provided at one end of the liquid level gauge tube (1), a transparent protective plate (3) is installed at the scale plate 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); The anti-frost structure comprises a U-shaped plate (4) fastened to the other end of the liquid level gauge tube (1) by bolts, a fixed cylinder (5) is fixedly installed in the middle of the inner wall of the U-shaped plate (4), a heating network is provided on the inner wall of the fixed cylinder (5) close to the end of the liquid level gauge tube (1), the fixed cylinder (5) is rotatably connected to the inner wall of the end away from the liquid level gauge tube (1), a first spiral groove (9) is provided on the second rotating rod (8), a movable disk (10) is movably sleeved on the second rotating rod (8), a groove (11) is provided on the side of the movable disk (10), and the groove ( 11), a first insertion rod (12) is fixedly inserted into the first spiral groove (9), one end of the first insertion rod (12) is movably inserted into the first spiral groove (9), an electric telescopic rod (6) is installed on the U-shaped plate (4), one end of the output shaft of the electric telescopic rod (6) is connected to the movable plate (10), a mounting sleeve (13) is fixedly sleeved on the upper end of the second rotating rod (8), a fan blade (14) is provided on the mounting sleeve (13), one end of the fixed cylinder (5) is connected to the first air supply pipe (15), and one end of the first air supply pipe (15) extends to between the transparent protective plate (3) and the scale plate.

2. The explosion-proof low-temperature liquid level gauge according to claim 1, characterized in that: The movable structure comprises a first fixed frame (16) mounted on the right side of the liquid level gauge tube (1); the first fixed frame (16) rotates through a third rotating rod (17) near the liquid level gauge tube (1); a first movable block (18) is sleeved on the third rotating rod (17); the first movable block (18) is fixedly inserted into a second insertion rod (19); a second spiral groove (20) is provided on the third rotating rod (17); one end of the second insertion rod (19) is movably inserted into the second spiral groove (20); the first movable block (18) is connected to a first vertical bar (21); the top end of the first vertical bar (21) movably passes through a penetration bar (22); a cleaning structure is provided at one end of the penetration bar (22); a transmission structure is provided between the third rotating rod (17) and the second rotating rod (8); and a driving structure is provided on the left side of the liquid level gauge tube (1).

3. The explosion-proof low-temperature liquid level gauge according to claim 2, characterized in that: The cleaning structure comprises two fixed disks (27) arranged at one end of the penetration strip (22), a rotating shaft (28) being rotatably connected between the two fixed disks (27), one of the fixed disks (27) being fixedly mounted on the penetration strip (22), a mounting plate (29) being fixedly sleeved on the rotating shaft (28), a mounting frame (30) being fastened to the bottom of the mounting plate (29) by bolts, a wiping cotton (31) being arranged in the mounting frame (30) by means of an insertion structure, and an air supply structure being arranged between the mounting frame (30) and the fixed cylinder (5).

4. The explosion-proof low-temperature liquid level gauge according to claim 3, characterized in that: The plug-in structure comprises two push rods (34) that movably pass through the mounting frame (30), one end of the push rod (34) is connected to the push block (33), and the other end of the push rod (34) is connected to a connecting piece (35). A first spring (38) is sleeved on the push rod (34) near one end of the connecting piece (35), and the two ends of the first spring (38) are respectively connected to the mounting frame (30) and the connecting piece (35). Through slots (36) are provided on both sides of the mounting frame (30), and an insertion block (37) is movably inserted into each of the through slots (36). One end of the connecting piece (35) is connected to the insertion block (37), and a plurality of plug-in rods are connected to the inner side of the insertion block (37), and the pointed end of the plug-in rod is inserted into the wiping cotton (31). A positioning rod (32) is connected to one side of the push block (33), and one end of the positioning rod (32) is movably inserted into the positioning slot provided on the fixing plate (27).

5. The explosion-proof low-temperature liquid level gauge according to claim 2, characterized in that: The transmission structure comprises a first rotating rod (7) fixedly connected to one end of a second rotating rod (8); a second gear (40) is fixedly sleeved on one end of the first rotating rod (7) that rotates and 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 meshingly connected.

6. The explosion-proof low-temperature liquid level gauge according to claim 2, characterized in that: The driving structure includes a second fixed frame (23) fastened to the left side of the liquid level gauge tube (1) by bolts, a fixed rod (24) is fixedly passed through the second fixed frame (23) near the side of the liquid level gauge tube (1), a second movable block (25) is movably sleeved on the fixed rod (24), the second movable block (25) is connected to the second vertical bar (26), the second vertical bar (26) is movably passed through the fixed bar (41) 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 the third insertion rod (42), the inner wall of the second fixed frame (23) is connected to the fixed plate (43), the fixed plate (43) is provided with a corrugated groove (44), and the bottom end of the third insertion rod (42) is movably inserted into the corrugated groove (44).

7. The explosion-proof low-temperature liquid level gauge according to claim 3, characterized in that: 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 bar (54) is connected between the inner walls of the two ends of the first fixed frame (16), the longitudinal bar (54) and the first fixed frame (16) are fixedly connected to the first inner bar (46), one end of the second air supply pipe (45) fixedly inserted into the first inner bar (46) is connected to the hose (51), and a retractable structure is provided in the first fixed frame (16). One end of the hose (51) is connected to the second fixed tube (48), and a second inner strip (47) is fixedly sleeved on one end of the second fixed tube (48). A connecting strip (50) is connected to the second inner strip (47), and one end of the connecting strip (50) is connected to the first movable block (18). The other end of the second fixed tube (48) is connected to the air outlet box (49), and the air outlet box (49) is fixedly inserted into the installation frame (30). The air outlet box (49) is provided with a plurality of air outlet holes on a side close to the wiping cotton (31).

8. The explosion-proof low-temperature liquid level gauge according to claim 7, characterized in that: The retractable structure comprises a plurality of T-shaped rods (52) movably passing through the longitudinal bars (54) and the first fixed frame (16), a U-shaped seat (56) being installed on one end of each T-shaped rod (52) inserted into the first fixed frame (16), a retractable wheel (55) being arranged in the U-shaped seat (56), a second spring (53) being sleeved on the T-shaped rod (52), one end of the second spring (53) being connected to one end of the T-shaped rod (52) passing through the first fixed frame (16), and the hose (51) passing around the plurality of retractable wheels (55) respectively.

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