Automatic liquid oxygen gasifier defrosting device

Abstract

The utility model relates to the technical field of vaporizer defrosting, in particular to an automatic liquid oxygen vaporizer defrosting device. The defrosting device of the automatic liquid oxygen gasifier comprises a first rolling brush, a second rolling brush and a driving mechanism. And the first rolling brush is horizontally arranged. And the second rolling brush and the first rolling brush are respectively arranged in parallel at intervals in the horizontal direction and the vertical direction. The driving mechanism is used for controlling the first rolling brush and the second rolling brush to roll and reciprocate in the vertical direction at the same time, frost and snow on the fin heat exchange tubes on the two sides are cleaned, and the moving directions of the first rolling brush and the second rolling brush in the vertical direction are always opposite. Defrosting is carried out in an alternate mode, the pressure on vaporizer components can be reduced, the service life of the vaporizer components is prolonged, the situation that the driving mechanism is damaged due to too large resistance when the first rolling brush and the second rolling brush roll or move up and down is avoided, and reliability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of vaporizer defrosting, in particular to an automatic liquid oxygen vaporizer defrosting device. Background Art

[0002] Liquid oxygen vaporizer is a device that converts liquid oxygen into gaseous oxygen. When exchanging heat, an air-temperature vaporizer is used. The heat exchange device in the air-temperature vaporizer mostly uses rust-proof aluminum alloy finned heat exchange tubes. The finned heat exchange tubes are exposed to the outside and rely on their own sensible heat and the absorption of external atmospheric heat to achieve the vaporization function. The boiling point of liquid oxygen is -183℃, which is a cryogenic liquid. Figure 1 As shown, liquid oxygen enters the air-temperature vaporizer through the liquid oxygen inlet 15, flows along the finned heat exchange tube 14 and releases cold energy, and becomes oxygen after heat exchange with the air on the surface of the finned heat exchange tube 14, and finally flows out through the oxygen outlet 16. The design temperature of oxygen out of the vaporizer reaches 5°C above room temperature, but due to long-term continuous use of the vaporizer, the surface of the finned heat exchange tube 14 is severely frosted and ice cubes are formed over time, resulting in reduced heat exchange efficiency, causing the oxygen outlet temperature to drop to -5°C to -20°C, which does not reach the oxygen design temperature.

[0003] In order to avoid the outlet gas temperature being too low, steam heat source is used for heating and defrosting, that is, steam is used to heat the finned heat exchange tubes. Although this method can increase the outlet pipeline temperature to 15-35°C, it requires a large amount of steam as a heat source. After the steam is defrosted or ice is formed, it is completely emptied and the steam cannot be recovered, resulting in a waste of resources. On the other hand, the frost or even ice on the surface of the finned heat exchange tube will form a certain amount of cold. After the steam eliminates the frost or ice, the cold released by the vaporizer liquid oxygen is also eliminated and cannot be recovered, resulting in a large loss of cold.

[0004] The invention patent application with application publication number CN108278922A provides a method for contact defrosting of an air temperature vaporizer, including preparing a defroster, the defroster is tightly nested outside the finned heat exchange tube of the air bath evaporator; the two sides of the defroster in the same row of the defroster are horizontally connected by a hard connecting rod, and the outer sides of the two rows of defrosters on the edge are longitudinally connected by a hard connecting rod to form a defroster complex, and the hard connecting rod and the defroster are fixed together by a screw; a driving device is installed, and under the drive of the driving device, a traction rope pulls the defroster complex to reciprocate up and down to achieve the purpose of defrosting. However, this defrosting method may cause the driving device or the traction rope to be damaged due to excessive resistance when the defroster complex reciprocates up and down, making maintenance difficult. Based on this, the prior art still needs to be improved. Utility Model Content

[0005] In view of the deficiencies of the prior art, the utility model provides an automatic liquid oxygen vaporizer defrosting device, which can at least solve the problem that the existing liquid oxygen vaporizer defrosting device is easily damaged due to excessive resistance.

[0006] The utility model discloses an automatic liquid oxygen vaporizer defrosting device comprising: a first roller brush, a second roller brush and a driving mechanism. The first roller brush is arranged horizontally. The second roller brush is arranged parallel to the first roller brush in a horizontal direction and a vertical direction respectively. The driving mechanism is used to simultaneously control the first roller brush and the second roller brush to roll and reciprocate up and down in the vertical direction to clean the frost and snow on the fin heat exchange tubes on both sides, wherein the moving directions of the first roller brush and the second roller brush in the vertical direction are always opposite.

[0007] In some embodiments, the driving mechanism includes a bracket, a transmission assembly and a driving assembly; the bracket is fixedly arranged above the gasifier; the transmission assembly includes a main drive wheel, a slave drive wheel, a first fixing member, a second fixing member and a transmission belt; the main drive wheel and the slave drive wheel are rotatably arranged on the bracket; the first fixing member and the second fixing member are both installed on the bracket; the two ends of the transmission belt are respectively connected to the first fixing member and the second fixing member, and are passed over the top of the main drive wheel and the top of the slave drive wheel in turn, the first roller brush is arranged on the transmission belt section between the first fixing member and the main drive wheel, and the second roller brush is arranged on the transmission belt section between the second fixing member and the slave drive wheel; the driving assembly is arranged on the bracket, and is used to drive the main drive wheel to rotate forward and reverse.

[0008] In some embodiments, the transmission assembly also includes a guide wheel, which is rotatably mounted on the bracket and is located between the main transmission wheel and the slave transmission wheel. The guide wheel is configured so that the height of its bottom is lower than the height of the top of the main transmission wheel and the slave transmission wheel, and the upper side of the transmission belt segment between the main transmission wheel and the slave transmission wheel abuts against the bottom of the guide wheel.

[0009] In some embodiments, the drive assembly includes a motor, a main sprocket, a secondary sprocket and a chain; the motor is mounted on a bracket; the middle part of the main sprocket is mounted on the output shaft of the motor, the secondary sprocket is rotatably mounted on the bracket, the chain is sleeved on the outside of the main sprocket and the secondary sprocket and meshes with the main sprocket and the secondary sprocket; the middle part of the main drive wheel is connected to the middle part of the secondary sprocket through a connecting shaft.

[0010] In some embodiments, the driving mechanism further includes a travel switch electrically connected to the motor, the travel switch being disposed at the top or bottom of the gasifier, and the travel switch being configured to control the motor to adjust the rotation direction after contacting the first roller brush or the second roller brush.

[0011] In some embodiments, there are two transmission assemblies, which are arranged in parallel along the axial direction of the first roller brush or the second roller brush and connected by a connecting piece; the driving assembly simultaneously controls the two transmission assemblies to work synchronously.

[0012] In some embodiments, the main transmission wheel, the slave transmission wheel and the guide wheel are all sprockets, and the transmission belt is a transmission chain.

[0013] In some embodiments, a working sprocket engaged with the transmission chains of the two transmission assemblies is respectively installed at both ends of the first roller brush and / or the second roller brush.

[0014] In some embodiments, the automatic liquid oxygen vaporizer defrost device also includes a reinforcing mechanism, which includes a bearing seat, a first bearing connecting sleeve, a second bearing connecting sleeve and a connecting rope; the bearing seat is arranged below the vaporizer, and a central axis is installed in the middle of the bearing seat; the first bearing connecting sleeve and the second bearing connecting sleeve are rotatably mounted on the first roller brush and the second roller brush respectively, and the connecting rope passes around the bottom of the central axis on the bearing seat and the two ends are respectively connected to the first bearing connecting sleeve and the second bearing connecting sleeve.

[0015] In some embodiments, the first roller brush and / or the second roller brush includes a roller shaft and bristles distributed around the roller shaft, and the bristles are in contact with the fin heat exchange tubes on both sides.

[0016] The beneficial effects of the utility model are as follows: the automatic liquid oxygen vaporizer defrosting device of the utility model adopts a driving mechanism to simultaneously control the first roller brush and the second roller brush to roll and reciprocate up and down relative to the fin heat exchange tube, and defrosts in an alternating manner, which can reduce the pressure on the vaporizer components, thereby extending its service life, and the first roller brush and the second roller brush will not be damaged by the driving mechanism due to excessive resistance when rolling or moving up and down, and the reliability is strong. The rolling and up and down movement of the first roller brush and the second roller brush can clean the frost and snow on the fin heat exchange tubes on both sides, improve the efficiency of removing frost and snow, make it easier for the vaporizer to absorb heat in the atmosphere, and realize liquid-gas conversion. After using this device, the labor intensity of the on-duty personnel can be reduced, which not only improves the gasification efficiency but also saves labor and avoids the possibility of frostbite. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram showing the state of an automatic liquid oxygen vaporizer defrosting device provided by the utility model being applied to a liquid oxygen vaporizer;

[0018] Figure 2 The utility model shows a principle diagram of an automatic liquid oxygen vaporizer defrosting device.

[0019] Description of reference numerals:

[0020] 1. Motor; 2. Main sprocket; 3. Secondary sprocket; 4. Chain; 5. Main drive wheel; 6. Slave drive wheel; 7. Guide wheel; 8. Drive belt; 9. First roller brush; 10. Second roller brush; 11. First fixing piece; 12. Second fixing piece; 13. Working sprocket; 14. Fin heat exchange tube; 15. Liquid oxygen inlet; 16. Oxygen outlet; 17. Bracket; 18. First vertical channel; 19. Second vertical channel; 20. First travel switch; 21. Second travel switch; 22. Connecting rope; 23. Bearing seat. DETAILED DESCRIPTION

[0021] It should be understood that the embodiments of the present invention shown in the exemplary embodiments are illustrative only. Although only a few embodiments are described in detail in the present invention, it is easy for those skilled in the art to understand that multiple modifications are feasible without actually departing from the teachings of the subject matter of the present invention. Accordingly, all such modifications should be included within the scope of the present invention. Without departing from the gist of the present invention, other replacements, modifications, changes and deletions may be made to the design, operating conditions and parameters of the following exemplary embodiments.

[0022] An automatic liquid oxygen vaporizer defrosting device of the utility model is arranged on one side of the liquid oxygen vaporizer near the liquid oxygen inlet 15, and includes: a first roller brush 9, a second roller brush 10 and a driving mechanism. The first roller brush 9 is horizontally arranged in the first vertical channel 18 between the two rows of finned heat exchange tubes 14 of the vaporizer. The second roller brush 10 is horizontally arranged in the second vertical channel 19 between the two rows of finned heat exchange tubes 14 of the vaporizer. Among them, the first vertical channel 18 and the second vertical channel 19 can be arranged adjacent to each other, or they can be arranged with several channels spaced apart. The driving mechanism is used to simultaneously control the first roller brush 9 and the second roller brush 10 to roll relative to the finned heat exchange tube 14 and reciprocate in the vertical direction to clean the frost and snow on the finned heat exchange tubes 14 on both sides. The moving directions of the first roller brush 9 and the second roller brush 10 in the vertical direction are always opposite, that is, when the first roller brush 9 reaches the bottom of the first vertical channel 18, the second roller brush 10 reaches the top of the second vertical channel 19; when the first roller brush 9 reaches the top of the first vertical channel 18, the second roller brush 10 reaches the bottom of the second vertical channel 19, thereby achieving complete defrosting of the fin heat exchange tube 14 from top to bottom with a large defrosting coverage area.

[0023] When the automatic liquid oxygen vaporizer defrost device of the present application is used to defrost the finned heat exchange tubes 14 of the vaporizer, one or more automatic liquid oxygen vaporizer defrost devices can be set on the side close to the liquid oxygen inlet 15 to work simultaneously, and the specific number is adaptively adjusted according to the amount of frost on the finned heat exchange tubes 14.

[0024] Compared with the prior art, the utility model adopts a driving mechanism to simultaneously control the first roller brush 9 and the second roller brush 10 to roll and reciprocate up and down relative to the fin heat exchange tube 14. By defrosting in an alternating manner, the pressure on the gasifier components can be reduced, thereby extending its service life. When the first roller brush 9 and the second roller brush 10 roll or move up and down, the driving mechanism will not be damaged due to excessive resistance, and the reliability is strong. When the first roller brush 9 and the second roller brush 10 roll and move up and down, the fin heat exchange tube 14 on both sides can be cleaned, the efficiency of removing frost and snow can be improved, and the gasifier can more easily absorb heat from the atmosphere to achieve liquid-gas conversion. After using this device, the labor intensity of the on-duty personnel can be reduced, which not only improves the gasification efficiency but also saves labor and avoids the possibility of frostbite.

[0025] In some embodiments, the driving mechanism includes a bracket 17, a transmission assembly and a driving assembly. The bracket 17 is fixedly arranged above the gasifier. Specifically, the bracket 17 can be installed on the top of the gasifier or on the ground. The transmission assembly includes a main transmission wheel 5, a slave transmission wheel 6, a first fixing member 11, a second fixing member 12 and a transmission belt 8. The main transmission wheel 5 and the slave transmission wheel 6 are both rotatably mounted on the bracket 17 and are higher than the fin heat exchange tube 14. Specifically, as Figure 1 As shown, the main transmission wheel 5 and the slave transmission wheel 6 are at the same height; the first fixing member 11 and the second fixing member 12 are both fixedly mounted on the bracket 17; the two ends of the transmission belt 8 are respectively connected to the first fixing member 11 and the second fixing member 12, and are passed over the top of the main transmission wheel 5 and the top of the slave transmission wheel 6 in turn, the first roller brush 9 is arranged on the transmission belt section between the first fixing member 11 and the main transmission wheel 5, and the second roller brush 10 is arranged on the transmission belt section between the second fixing member 12 and the slave transmission wheel 6; the driving assembly is arranged on the bracket 17, and is used to drive the main transmission wheel 5 to rotate forward and reverse.

[0026] The clockwise rotation of the main transmission wheel 5 is considered as positive rotation, and the counterclockwise rotation is considered as negative rotation. When the main transmission wheel 5 rotates forward, the first roller brush 9 is driven to rotate upward through the transmission belt 8, and at this time, the second roller brush 10 rotates downward under the action of gravity. On the contrary, when the main transmission wheel 5 rotates backward, the first roller brush 9 is driven to rotate downward through the transmission belt 8, and at this time, the second roller brush 10 rotates upward under the pull of the transmission belt 8. The first roller brush 9 and the second roller brush 10 alternately rise and fall, and work continuously for a long time to achieve the purpose of defrosting. By defrosting in an alternating manner, the pressure on the gasifier components can be reduced, thereby extending their service life.

[0027] In some embodiments, the transmission assembly also includes a guide wheel 7, which is rotatably mounted on the bracket 17 and is located between the main transmission wheel 5 and the slave transmission wheel 6. The guide wheel 7 is configured so that the height of its bottom is lower than the height of the top of the main transmission wheel 5 and the slave transmission wheel 6, and the upper side of the transmission belt section between the main transmission wheel 5 and the slave transmission wheel 6 abuts against the bottom of the guide wheel 7. By setting the guide wheel 7, the transmission belt 8 can be tightly fitted with the main transmission wheel 5 and the slave transmission wheel 6 to maintain a pre-tightened state, thereby preventing the transmission belt 8 from slipping and ensuring the normal operation of the transmission action.

[0028] In some embodiments, the driving assembly includes a motor 1, a main sprocket 2, a secondary sprocket 3 and a chain 4. The motor 1 is mounted on a bracket 17; the middle of the main sprocket 2 is mounted on the output shaft of the motor 1, the secondary sprocket 3 is rotatably mounted on the bracket 17, the chain 4 is sleeved on the outside of the main sprocket 2 and the secondary sprocket 3 and meshes with the main sprocket 2 and the secondary sprocket 3; the middle of the main transmission wheel 5 is connected to the middle of the secondary sprocket 3 through a connecting shaft. When the motor 1 is started, the main sprocket 2 is controlled to rotate, the main sprocket 2 drives the secondary sprocket 3 to rotate through the chain 4, and the secondary sprocket 3 drives the main transmission wheel 5 to rotate synchronously. Due to the arrangement of the main sprocket 2, the secondary sprocket 3 and the chain 4, an accurate average transmission ratio can be provided, and the chain 4 can drive the first roller brush 9 and the second roller brush 10 to roll and move up and down at a suitable speed.

[0029] In some embodiments, the driving mechanism further includes a travel switch electrically connected to the driving assembly, the travel switch is disposed at the top or bottom of the gasifier, and the travel switch is configured to control the motor 1 to adjust the rotation direction after contacting the first roller brush 9 or the second roller brush 10. Specifically, Figure 1 As shown, the travel switch includes a first travel switch 20 and a second travel switch 21. The first travel switch 20 is arranged at the bottom of the first vertical channel 18, and the second travel switch 21 is arranged at the bottom of the second vertical channel 19. When the first roller brush 9 touches the first travel switch 20 or the second roller brush 10 touches the second travel switch 21, the motor 1 adjusts the rotation direction. For example, when the first roller brush 9 touches the first travel switch 20, the motor 1 is adjusted from clockwise rotation to counterclockwise rotation, the first roller brush 9 starts to descend, and the second roller brush 10 starts to rise. When the second roller brush 10 touches the second travel switch 21, the motor 1 is adjusted from counterclockwise rotation to clockwise rotation, the first roller brush 9 starts to rise, and the second roller brush 10 starts to descend.

[0030] In some embodiments, there are two sets of transmission assemblies, and the two sets of transmission assemblies are arranged in parallel along the axial direction of the first roller brush 9 or the second roller brush 10, and are connected by a connecting member. Specifically, the two main transmission wheels 5, the two slave transmission wheels 6 and the two guide wheels 7 of the two transmission assemblies are fixedly connected by a connecting shaft, and the connecting shaft connecting the two slave transmission wheels 6 is connected to the central axis of the secondary sprocket 3. The two transmission belts 8 of the two transmission assemblies are respectively sleeved on the two ends of the first roller brush 9 and the second roller brush 10. The setting of the two transmission assemblies can make the first roller brush 9 and / or the second roller brush 10 move more smoothly and will not tilt due to the support point not being in the center. In particular, when two sets of transmission assemblies are set, the interval between the two transmission assemblies is greater than the lateral length of the first vertical channel 18 and / or the second vertical channel 19, so that the operation of the transmission assembly is not affected by the narrow vertical channel between two adjacent rows of fin heat exchange tubes 14, thereby ensuring the normal operation of the transmission work.

[0031] In some embodiments, the main transmission wheel 5, the secondary transmission wheel 6 and the guide wheel 7 are all sprockets, and the transmission belt 8 is a transmission chain. Compared with the belt drive, the chain drive has a more accurate transmission ratio, can achieve efficient power transmission, has high working reliability, and is suitable for occasions requiring stable transmission.

[0032] In some embodiments, a working sprocket 13 meshing with the corresponding transmission chain is installed at both ends of the first roller brush 9 and / or the second roller brush 10 to prevent elastic sliding and slipping of the first roller brush 9 and / or the second roller brush 10, and the transmission effect is good. When installed, each working sprocket 13 is located outside the first vertical channel 18 or the second vertical channel 19 in the horizontal direction to prevent the rotation of the working sprocket 13 from being affected by the narrow vertical channel.

[0033] In some embodiments, the automatic liquid oxygen vaporizer defrosting device further includes a bearing seat 23, a first bearing connection sleeve, a second bearing connection sleeve and a connecting rope 22; the bearing seat 23 is arranged below the vaporizer, and a central axis is installed in the middle of the bearing seat 23. For example, two bearing seats 23 can be provided, which are respectively located below the first vertical channel 18 and the second vertical channel 19. The first bearing connection sleeve and the second bearing connection sleeve are rotatably sleeved on the first roller brush 9 and the second roller brush 10, respectively, and connecting ear plates are arranged thereon, and the connecting rope 22 passes around below the central axis on the two bearing seats 23 and the two ends are respectively connected to the first bearing connection sleeve and the second bearing connection sleeve. Since the second roller brush 10 relies on its own gravity to move downward, and if the frost and snow in the second vertical channel 19 are thick, the downward movement may be blocked. In order to ensure the smooth descent of the second roller brush 10 and the first roller brush 9, a connecting rope 22 is connected between the two to keep the first roller brush 9 and the second roller brush 10 at a preset distance at all times. In this way, when the movement of the first roller brush 9 or the second roller brush 10 is blocked, the connecting rope 22 is used to pull the first roller brush 9 or the second roller brush 10 downward to overcome the obstacle and ensure the normal defrosting work.

[0034] In some embodiments, the first roller brush 9 and / or the second roller brush 10 includes a roller shaft and bristles distributed around the roller shaft, the bristles are in contact with the fin heat exchange tubes 14 on both sides, and the friction between the bristles and the walls of the fin heat exchange tubes 14 is used to remove frost and snow on the fin heat exchange tubes 14. The bristles can be made of synthetic materials or natural wool.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. If the present invention is modified or replaced by equivalents without departing from the spirit and scope of the present invention, it should be included in the scope of protection of the claims of the present invention.

Claims

1. An automatic liquid oxygen vaporizer defrosting device, characterized in that: include: A first rolling brush (9), wherein the first rolling brush (9) is arranged horizontally; a second roller brush (10), the second roller brush (10) and the first roller brush (9) being arranged in parallel and spaced apart in the horizontal direction and the vertical direction respectively; A driving mechanism, the driving mechanism is used to simultaneously control the first rolling brush (9) and the second rolling brush (10) to roll and reciprocate along the vertical direction, wherein the movement directions of the first rolling brush (9) and the second rolling brush (10) in the vertical direction are always opposite.

2. The automatic liquid oxygen vaporizer defrosting device according to claim 1, characterized in that: The driving mechanism comprises a bracket (17), a transmission assembly and a driving assembly; the bracket (17) is fixedly arranged above the gasifier; the transmission assembly comprises a main transmission wheel (5), a slave transmission wheel (6), a first fixing member (11), a second fixing member (12) and a transmission belt (8); the main transmission wheel (5) and the slave transmission wheel (6) are rotatably arranged on the bracket (17); the first fixing member (11) and the second fixing member (12) are both installed on the bracket (17); the two ends of the transmission belt (8) are respectively connected to the first fixing member (11) and the second fixing member (12), and are passed over the main transmission wheel (5) and the slave transmission wheel (6) in sequence; the first roller brush (9) is arranged on the transmission belt section between the first fixing member (11) and the main transmission wheel (5), and the second roller brush (10) is arranged on the transmission belt section between the second fixing member (12) and the slave transmission wheel (6); the driving assembly is arranged on the bracket (17) and is used to drive the main transmission wheel (5) to rotate forward and reverse.

3. The automatic liquid oxygen vaporizer defrosting device according to claim 2, characterized in that: The transmission assembly further comprises a guide wheel (7), the guide wheel (7) being rotatably mounted on the bracket (17) and being located between the main transmission wheel (5) and the slave transmission wheel (6), the guide wheel (7) being arranged such that the height of its bottom is lower than the height of the top of the main transmission wheel (5) and the slave transmission wheel (6), and the upper side of the transmission belt section between the main transmission wheel (5) and the slave transmission wheel (6) abuts against the lower side of the guide wheel (7).

4. The automatic liquid oxygen vaporizer defrosting device according to claim 2, characterized in that: The driving assembly comprises a motor (1), a main sprocket (2), a secondary sprocket (3) and a chain (4); the motor (1) is mounted on the bracket (17); the middle portion of the main sprocket (2) is mounted on the output shaft of the motor (1), the secondary sprocket (3) is rotatably mounted on the bracket (17), the chain (4) is sleeved on the outside of the main sprocket (2) and the secondary sprocket (3) and meshed with the main sprocket (2) and the secondary sprocket (3); the middle portion of the main transmission wheel (5) is connected to the middle portion of the secondary sprocket (3) via a connecting shaft.

5. The automatic liquid oxygen vaporizer defrosting device according to claim 4, characterized in that: The driving mechanism further comprises a travel switch electrically connected to the motor (1), the travel switch being arranged at the top or the bottom of the gasifier, and the travel switch being configured to control the motor (1) to adjust the rotation direction after contacting the first roller brush (9) or the second roller brush (10).

6. The automatic liquid oxygen vaporizer defrosting device according to claim 2, characterized in that: The transmission components include two sets, which are arranged in parallel along the axial direction of the first roller brush (9) or the second roller brush (10) and connected via a connecting piece; the driving component simultaneously controls the two transmission components to work synchronously.

7. The automatic liquid oxygen vaporizer defrosting device according to claim 6, characterized in that: The main transmission wheel (5), the slave transmission wheel (6) and the guide wheel (7) are all sprocket wheels, and the transmission belt (8) is a transmission chain.

8. The automatic liquid oxygen vaporizer defrosting device according to claim 7, characterized in that: A working sprocket (13) meshing with the transmission chains of the two sets of transmission components is respectively installed at both ends of the first roller brush (9) and / or the second roller brush (10).

9. The automatic liquid oxygen vaporizer defrosting device according to claim 1, characterized in that: It also includes a bearing seat (23), a first bearing connecting sleeve, a second bearing connecting sleeve and a connecting rope (22); the bearing seat (23) is arranged below the gasifier, and a central axis is installed in the middle of the bearing seat (23); the first bearing connecting sleeve and the second bearing connecting sleeve are rotatably mounted on the first roller brush (9) and the second roller brush (10), respectively, and the connecting rope (22) is passed around below the central axis on the bearing seat (23) and its two ends are respectively connected to the first bearing connecting sleeve and the second bearing connecting sleeve.

10. The automatic liquid oxygen vaporizer defrosting device according to claim 1, characterized in that: The first roller brush (9) and / or the second roller brush (10) comprises a roller shaft and bristles distributed around the roller shaft, and the bristles are in contact with the fin heat exchange tube (14).

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