A device for cleaning the interior of a gas cylinder

Abstract

This invention relates to the field of gas cylinder cleaning technology and discloses a gas cylinder internal cleaning device. The invention includes: an outer cylinder and an inner cylinder rotatably disposed within the outer cylinder, with a cleaning assembly disposed within the inner cylinder. The cleaning assembly includes a perforated cylinder and a storage cylinder fixedly disposed within the inner cylinder. The storage cylinder contains stainless steel abrasive for cleaning the inside of the gas cylinder. A stop tube is rotatably disposed on the storage cylinder, rotating with the inner cylinder as it rotates. One end of the stop tube extends into the perforated cylinder and is rotatably connected to it, allowing the gas cylinder to rotate and tumble during cleaning, thus better cooperating with the stainless steel abrasive to clean the inside of the gas cylinder. This invention utilizes stainless steel abrasive in conjunction with a cleaning fluid to clean the inside of the gas cylinder, and during cleaning, it can cause the gas cylinder to rotate and tumble, thereby improving the cleaning efficiency and effect of the gas cylinder's internal cleaning.

Description

Technical Field

[0001] This invention relates to the field of gas cylinder cleaning technology, and more particularly to a gas cylinder internal cleaning device. Background Technology

[0002] A gas cylinder is a portable, refillable pressure vessel mainly used for storing and transporting gases. In order to ensure the purity of newly filled gas and avoid cross-contamination between different gases, the gas cylinder needs to be cleaned before use, especially its internal cleaning.

[0003] Currently, due to the small size of gas cylinder openings, traditional physical cleaning tools are unable to penetrate the interior to clean the inner walls. Therefore, the cleaning of the inside of gas cylinders generally adopts water-based cleaning methods, that is, first rinsing with a high-pressure water gun, and then removing the internal oil and rust through chemical cleaning (acetone, alkaline solution). However, without the combination of physical cleaning, chemical cleaning takes a long time to deal with some stubborn deposits (for example, using alkaline solution or organic solvent for grease cleaning generally takes 30 minutes to 2 hours, and using hydrochloric acid or phosphoric acid for corrosion prevention treatment takes 2 to 12 hours).

[0004] Therefore, it is necessary to propose a gas cylinder internal cleaning device with higher cleaning efficiency to solve the above problems. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a gas cylinder internal cleaning device.

[0006] The present invention is achieved by the following technical solution: an outer cylinder and an inner cylinder rotatably disposed inside the outer cylinder, wherein a cleaning component is disposed inside the inner cylinder; The cleaning assembly includes a perforated cylinder and a storage cylinder fixedly installed inside the inner cylinder. The storage cylinder contains stainless steel sand for cleaning the inside of the gas cylinder. A push tube is rotatably installed on the storage cylinder, which rotates with the inner cylinder. One end of the push tube extends into the perforated cylinder and is rotatably connected to the perforated cylinder, so that the gas cylinder flips and rotates during cleaning, which better works with the stainless steel sand to clean the inside of the gas cylinder. The inner cylinder is also equipped with a flushing pipe that extends from one end into the storage cylinder to the other end outside the inner cylinder, thereby delivering cleaning fluid into the gas cylinder. The inner cylinder is also equipped with an L-shaped limiting frame that can be raised, lowered and moved laterally, which can not only limit the gas cylinder inside the hollow cylinder, but also hold the gas cylinder against the retaining pipe.

[0007] As a further improvement to the above solution, the L-shaped limiting frame is similar in shape to the outer contour of the gas cylinder. Multiple magnets are fixedly installed on the L-shaped limiting frame so that when the L-shaped limiting frame limits the gas cylinder, the magnets are close to the surface of the gas cylinder and attract the stainless steel sand inside the gas cylinder, so that the stainless steel sand is evenly and tightly attached to the inner wall of the gas cylinder.

[0008] As a further improvement to the above solution, a frame capable of lifting and lowering is provided inside the inner cylinder. An L-shaped limiting frame is set inside the frame and slidably connected to the frame. On both sides of the frame, there are also push-back components that allow the L-shaped limiting frame to move and reset. A trapezoidal protrusion is provided on the L-shaped limiting frame, and a notch is provided on the hollow cylinder. This allows the L-shaped limiting frame to push the gas cylinder against the notch when it enters the hollow cylinder, as the trapezoidal protrusion abuts against the edge of the notch.

[0009] As a further improvement to the above solution, the flushing pipe consists of a main pipe, a first branch pipe, and a second branch pipe. The first branch pipe is rotatably connected to the storage cylinder and the main pipe. The water outlet of the first branch pipe extends into the storage cylinder and is offset from the stop pipe. The first branch pipe is connected to the frame for transmission. This allows the frame to simultaneously adjust the angle of the water outlet of the first branch pipe when it drives the L-shaped limiting frame to limit and tighten the gas cylinder. When cleaning the gas cylinder, cleaning fluid is poured into the gas cylinder opening. When stainless steel sand needs to be discharged into the storage cylinder after cleaning, it is offset from the gas cylinder opening to prevent stainless steel sand from entering.

[0010] As a further improvement to the above solution, a torsion spring for rotational reset is provided between the first branch pipe and the storage cylinder, a rocker plate is fixedly provided on the first branch pipe, and a top frame for pushing the rocker plate is fixedly provided on the frame, so as to adjust the angle of the water outlet end of the first branch pipe by pushing the rocker plate to drive the first branch pipe to rotate.

[0011] As a further improvement to the above solution, a drain outlet is provided on the storage cylinder. The portion of the first branch pipe inside the storage cylinder is fixedly fitted with a cover that is positioned opposite the drain outlet. This ensures that during cylinder cleaning, the water outlet of the first branch pipe is positioned opposite the cylinder opening, and the cover is offset from the drain outlet, allowing the cleaning waste liquid inside the cylinder to be discharged. When the cylinder cleaning is completed and stainless steel sand needs to be discharged into the storage cylinder, the water outlet of the first branch pipe is offset from the cylinder opening, and the cover blocks the drain outlet to prevent the stainless steel sand from being lost.

[0012] As a further improvement to the above solution, a cleaning brush is installed inside the hollow cylinder, and a spray pipe connected to the second branch pipe of the flushing pipe is also installed inside the inner cylinder. This allows the gas cylinder to be cleaned not only with stainless steel sand when the hollow cylinder rotates, but also with its surface.

[0013] As a further improvement to the above solution, a rubber stop plate is also rotatably installed on the L-shaped limiting frame, so that the rotation of the gas cylinder will not be affected when the L-shaped limiting frame is pressed against the bottom of the gas cylinder.

[0014] As a further improvement to the above solution, multiple sets of ring-shaped sliding beads are embedded in the inner wall of the hollow cylinder, so as to reduce the frictional resistance encountered by the gas cylinder when it rotates inside the hollow cylinder.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: By setting up a rotatable inner cylinder and installing a cleaning assembly inside the inner cylinder consisting of a hollow cylinder, a storage cylinder, a retaining tube, and stainless steel sand, the cylinder can rotate and turn on its own. Combined with the stainless steel sand and a flushing tube that can rinse the inside of the cylinder, compared to existing cylinder cleaning devices, it is not limited by the cylinder opening and combines physical and chemical cleaning, which not only improves the cleaning efficiency of the inside of the cylinder but also improves the cleaning effect. By setting multiple magnets on the L-shaped limiting frame, the L-shaped limiting frame can not only work with the hollow cylinder and the abutment tube to firmly limit the gas cylinder and ensure that the gas cylinder can rotate normally, but also allow the stainless steel sand entering the gas cylinder to adhere more tightly and evenly to the gas cylinder. When the gas cylinder rotates, the stainless steel sand can stick tightly to the inner wall of the gas cylinder on the side closest to the magnet, resulting in a better cleaning effect on the inner wall of the gas cylinder. At the same time, it can also prevent the stainless steel sand from being discharged with the wastewater and causing loss. By setting the first branch of the flushing pipe to be rotatably connected to the storage cylinder and to the frame drive, the nozzle at the outlet of the first branch pipe can pour cleaning fluid into the cylinder mouth when the stainless steel sand is in the cylinder and the cylinder is being cleaned. When the stainless steel sand needs to be discharged into the storage cylinder, the nozzle at the outlet of the first branch pipe is offset from the cylinder mouth and abuts against the inner wall of the storage cylinder to achieve a seal, thus preventing the stainless steel sand from falling into the nozzle at the outlet of the first branch pipe and causing the nozzle to become blocked. By connecting the cover used to seal the drain outlet to the first branch pipe, the cover can be removed from the drain outlet when stainless steel sand enters the gas cylinder, ensuring that the cleaning wastewater in the gas cylinder can be discharged through the drain outlet. When the stainless steel sand is discharged into the storage cylinder, the drain outlet is sealed to prevent the stainless steel sand from leaking from the drain outlet and to ensure that the stainless steel sand can be reused. Attached Figure Description

[0016] Figure 1 This is an overall view of the internal cleaning device for gas cylinders according to the present invention; Figure 2 This is a diagram showing the disassembled internal cleaning device for gas cylinders according to the present invention. Figure 3 This is a front sectional view of the internal cleaning device for gas cylinders of the present invention. Figure 4 This is a disassembled view of the internal cleaning device for gas cylinders according to the present invention; Figure 5 This is a cross-sectional view of the inner cylinder; Figure 6 This is a disassembled diagram showing the hollowed-out cylinder and the support tube; Figure 7 Assembly and disassembly diagrams of the frame and L-shaped limiting frame; Figure 8 A separate image showing the flushing tube; Figure 9 This is a flowchart illustrating the operation of the internal cleaning device for gas cylinders according to the present invention.

[0017] Explanation of key symbols: 1. Outer cylinder 1; 101. Feed inlet; 102. Discharge outlet; 103. Drain pipe head; 104. Motor; 2. Inner cylinder; 201. Electric push rod; 3. Hollow cylinder; 301. Notch; 302. Slipper ball; 303. Cleaning brush; 4. Storage cylinder; 5. Abutment pipe; 6. Frame; 7. L-shaped limiting frame; 701. Trapezoidal protrusion; 702. Rubber abutment plate; 8. Magnet; 9. Flushing pipe; 901. Main pipe; 9011. Connector; 902. First branch pipe; 903. Second branch pipe; 10. Spray pipe; 11. Top frame; 12. Rocker plate; 13. Torsion spring; 14. Cover; 15. Drain outlet. Detailed Implementation

[0018] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0019] Please combine Figures 1 to 9 The internal cleaning device for gas cylinders includes: an outer cylinder 1 and an inner cylinder 2 rotatably disposed inside the outer cylinder 1. Both the outer cylinder 1 and the inner cylinder 2 are open cylinders, consisting of a cylindrical body and a single end cap. The two are combined into a complete sealed cylinder. While the outer cylinder 1 and the inner cylinder 2 are rotatably connected, a certain gap is maintained to allow wastewater to flow. The bottom of the outer cylinder 1 is also provided with a support base, on which a motor 104 is fixedly installed. A circular gear is provided on the motor 104, and a gear ring that meshes with the circular gear is fixedly installed on the inner cylinder 2. The inner cylinder 2 is driven to rotate by the motor 104. The outer cylinder 1 has an inlet 101 at the nine o'clock position and an outlet 102 at the four o'clock position for putting in and wading gas cylinders. The bottom of the outer cylinder 1 is also provided with a drain pipe head 103. The inner cylinder 2 is provided with a cleaning assembly. Please combine Figure 2 and Figure 3The cleaning assembly includes a perforated cylinder 3 and a storage cylinder 4 fixedly installed inside the inner cylinder 2. The storage cylinder 4 contains stainless steel sand for cleaning the inside of the gas cylinder. The stainless steel sand is made of 410, 420, or 440 stainless steel with strong magnetism, ensuring that the sand is affected by a magnet 8. A retaining tube 5 is rotatably mounted on the storage cylinder 4, rotating with the inner cylinder 2. The inner diameter of the retaining tube 5 near the perforated cylinder 3 is slightly larger than the gas cylinder nozzle, allowing the nozzle to be inserted into the retaining tube 5. The inner diameter of the retaining tube 5 near the storage cylinder 4 is smaller, similar to the inner diameter of the gas cylinder nozzle, allowing the stainless steel sand to enter the gas cylinder through the retaining tube 5. When the cylinder is in place, it is not restricted by the cylinder nozzle. A circular gear is fixedly sleeved on the abutment tube 5, and a toothed ring that meshes with the circular gear is fixedly installed on the inner wall of the outer cylinder 1. This allows the circular gear to rotate due to the influence of the toothed ring when the inner cylinder 2 drives the cleaning component to rotate. One end of the abutment tube 5 extends into the hollow cylinder 3 and is rotatably connected to the hollow cylinder 3. The end of the abutment tube 5 extending into the hollow cylinder 3 is made of rubber to ensure that it will not damage the surface of the cylinder when it is pressed against the cylinder, while also smoothly driving the cylinder to rotate. This allows the cylinder to rotate and flip during cleaning, better cooperating with the stainless steel sand to clean the inside of the cylinder. The inner cylinder 2 is also provided with a flushing pipe 9 that extends into the storage cylinder 4 at one end and out of the inner cylinder 2 at the other end, so as to deliver cleaning fluid into the gas cylinder. The inner cylinder 2 is also provided with an L-shaped limiting frame 7 that can be lifted and moved laterally, so as to not only limit the gas cylinder in the hollow cylinder 3, but also press the gas cylinder against the retaining pipe 5.

[0020] The above technical solution enables the gas cylinder to rotate and tip over. Combined with stainless steel sand and a flushing pipe 9 for rinsing the inside of the gas cylinder, it is not limited by the gas cylinder opening compared to existing gas cylinder cleaning devices. It combines physical and chemical cleaning, which not only improves the cleaning efficiency of the gas cylinder's interior but also enhances the cleaning effect.

[0021] Please combine Figure 7 The L-shaped limiting frame 7 is similar in shape to the outer contour of the gas cylinder. Multiple magnets 8 are fixedly installed on the L-shaped limiting frame 7. The magnets 8 can be neodymium iron boron magnets with strong magnetism. When the L-shaped limiting frame 7 limits the gas cylinder, the magnets 8 are close to the surface of the gas cylinder and attract the stainless steel sand inside the gas cylinder, so that the stainless steel sand is evenly and tightly attached to the inner wall of the gas cylinder.

[0022] Through the above technical solution, the L-shaped limiting frame 7 can not only work with the hollow cylinder 3 and the abutment tube 5 to tightly limit the gas cylinder and ensure that the gas cylinder can rotate normally, but also allow the stainless steel sand entering the gas cylinder to adhere more tightly and evenly to the gas cylinder. When the gas cylinder rotates, the stainless steel sand can stick tightly to the inner wall of the gas cylinder near the magnet 8, resulting in a better cleaning effect on the inner wall of the gas cylinder. At the same time, it can also prevent the stainless steel sand from being discharged with the wastewater and causing loss.

[0023] Please combine Figure 5 The inner cylinder 2 is equipped with a lifting frame 6. An L-shaped limiting frame 7 is installed inside the frame 6 and slidably connected to the frame 6. An electric push rod 201 is fixedly installed on the bottom inner wall of the inner cylinder 2. The output rod of the electric push rod 201 is fixedly connected to the frame 6, thereby driving the frame 6 and the L-shaped limiting frame 7 installed on the frame 6 to rise and fall. The two sides of the frame 6 are also equipped with a reverse thrust assembly to move and reset the L-shaped limiting frame 7. The reverse thrust assembly includes a connecting block that passes through the frame 6 and is fixedly connected to the L-shaped limiting frame 7. A sliding rod is provided on the connecting block. A stop block is fixedly provided on the frame 6. The sliding rod passes through the stop block and is slidably connected to the stop block. A spring is slidably sleeved on the sliding rod. The two ends of the spring abut against the connecting block and the stop block, respectively. A trapezoidal protrusion 701 is provided on the L-shaped limiting frame 7. A notch 301 is provided on the hollow cylinder 3. This allows the L-shaped limiting frame 7 to push the gas cylinder against the stop tube 5 when it enters the hollow cylinder 3, as the trapezoidal protrusion 701 abuts against the edge of the notch 301.

[0024] Please combine Figure 8 The flushing pipe 9 consists of a main pipe 901, a first branch pipe 902, and a second branch pipe 903. The end of the main pipe 901 extending outside the inner cylinder 2 is provided with a rotatable connector 9011, so as to ensure that the flushing pipe 9 can be connected to the external water supply pipe and can also rotate synchronously with the inner cylinder 2 without restriction. The first branch pipe 902 is rotatably connected to the storage cylinder 4 and the main pipe 901. The water outlet end of the first branch pipe 902 extending into the storage cylinder 4 is offset from the stop pipe 5 and is provided with a nozzle. The first branch pipe 902 is connected to the frame 6 in a transmission manner, so that when the frame 6 drives the L-shaped limiting frame 7 to limit and press the gas cylinder, the angle of the water outlet end of the first branch pipe 902 is adjusted synchronously. When cleaning the gas cylinder, the cleaning fluid is poured into the gas cylinder opening. When the stainless steel sand needs to be discharged into the storage cylinder 4 after cleaning, it is offset from the gas cylinder opening to prevent the stainless steel sand from entering. The storage cylinder 4 is equipped with a drain port 15. The portion of the first branch pipe 902 inside the storage cylinder 4 is fixedly fitted with a cover 14 that is opposite to the drain port 15. This allows the cleaning waste liquid inside the gas cylinder to be discharged when the gas cylinder is being cleaned, with the water outlet of the first branch pipe 902 opposite to the gas cylinder opening and the cover 14 offset from the drain port 15. When the gas cylinder is being cleaned and stainless steel sand needs to be discharged into the storage cylinder 4, the water outlet of the first branch pipe 902 is offset from the gas cylinder opening, and the cover 14 blocks the drain port 15 to prevent the stainless steel sand from being lost.

[0025] Through the above technical solution, by setting the first branch pipe 902 of the flushing pipe 9 to be rotatably connected to the storage cylinder 4 and to be drivenly connected to the frame 6, the nozzle at the water outlet of the first branch pipe 902 can pour cleaning fluid into the cylinder mouth when the stainless steel sand is in the gas cylinder and the gas cylinder is being cleaned. When the stainless steel sand needs to be discharged into the storage cylinder 4, the nozzle at the water outlet of the first branch pipe 902 is offset from the gas cylinder mouth and abuts against the inner wall of the storage cylinder 4 to achieve a seal, so as to prevent the stainless steel sand from falling into the nozzle at the water outlet of the first branch pipe 902 and causing the nozzle to become blocked. By connecting the cover 14 used to seal the drain outlet 15 to the first branch pipe 902, the cover 14 can be removed from the drain outlet 15 when stainless steel sand enters the gas cylinder, ensuring that the cleaning wastewater in the gas cylinder can be discharged through the drain outlet 15. When the stainless steel sand is discharged into the storage cylinder 4, the drain outlet 15 is sealed to prevent the stainless steel sand from leaking from the drain outlet 15 and to ensure that the stainless steel sand can be reused.

[0026] A torsion spring 13 for rotational reset is provided between the first branch pipe 902 and the storage cylinder 4. A rocker plate 12 is fixedly provided on the first branch pipe 902. A top frame 11 for pushing the rocker plate 12 is fixedly provided on the frame 6. In this way, the first branch pipe 902 is rotated by pushing the rocker plate 12 to adjust the angle of the water outlet end of the first branch pipe 902.

[0027] A cleaning brush 303 is installed inside the hollow cylinder 3, and a spray pipe 10 connected to the second branch pipe 903 of the flushing pipe 9 is also installed inside the inner cylinder 2. This allows the gas cylinder to be cleaned not only with stainless steel sand when the hollow cylinder 3 rotates, but also with its surface.

[0028] A rubber stop plate 702 is also rotatably mounted on the L-shaped limiting frame 7, so that when the L-shaped limiting frame 7 is pressed against the bottom of the gas cylinder, it will not affect the rotation of the gas cylinder.

[0029] Multiple sets of ring-shaped sliding beads 302 are embedded on the inner wall of the hollow cylinder 3, so as to reduce the frictional resistance when the gas cylinder rotates inside the hollow cylinder 3.

[0030] The implementation principle of the internal cleaning device for gas cylinders in this embodiment is as follows: Before use, connect the connector 9011 on the flushing pipe 9 to the external water supply pipe, and connect the drain pipe head 103 to the external sewage pipe. When using (refer to the attached document for the initial state of the cleaning device) Figure 3 Insert the gas cylinder to be cleaned into the hollow cylinder 3 (with the gas cylinder opening facing inwards towards the abutment tube 5), then start the electric push rod 201 to drive the frame 6 and the L-shaped limiting frame 7 to rise until the L-shaped limiting frame 7 enters the hollow cylinder 3 through the notch 301 and gets close to the gas cylinder. During this process, the trapezoidal protrusion 701 on the L-shaped limiting frame 7 is pressed against the edge of the notch 301 during the rise, so that the L-shaped limiting frame 7 moves towards one side of the storage cylinder 4 while squeezing the reverse push assembly, until the rubber abutment 702 on it abuts against the bottom of the gas cylinder and pushes the gas cylinder nozzle into the abutment tube 5, so that the abutment tube 5 and the L-shaped limiting frame 7 clamp the gas cylinder. During this process, the frame 6 will drive the top frame 11 to squeeze the rocker plate 12 on the first branch pipe 902 of the flushing pipe 9, so that the rocker plate 12 will drive the first branch pipe 902 and the cover 14 to rotate, thereby allowing the cover 14 to be moved away from the drain port 15 on the storage cylinder 4, and allowing the drain end of the first branch pipe 902 to be moved to the center position of the storage cylinder 4 to align with the stop pipe 5 and the gas cylinder mouth. Subsequently, the motor 104 is started to drive the inner cylinder 2 to rotate, causing the inner cylinder 2 to rotate 90 degrees counterclockwise so that the storage cylinder 4 is at the 12 o'clock position. At this time, the stainless steel sand in the storage cylinder 4 falls into the gas cylinder. Then, cleaning fluid or cleaning water is poured into the gas cylinder through the flushing pipe 9. The motor 104 drives the inner cylinder 2 to rotate continuously, and the inner cylinder 2 drives the gas cylinder to rotate. At the same time, the gear on the abutment pipe 5, in the process of rotation, cooperates with the stationary gear ring to drive the gas cylinder to rotate. When the gas cylinder rotates, the stainless steel sand affected by the magnet 8 will stick tightly to the inner wall of the gas cylinder and clean the gas cylinder as the gas cylinder rotates. When the gas cylinder rotates, the cleaning brush 303 in the hollow cylinder 3, together with the spray pipe 10, can also clean the surface of the gas cylinder. The cleaning waste liquid in the inner cylinder 2 will be discharged into the outer cylinder 1 through the connection port between the hollow cylinder 3 and the inner cylinder 2 and discharged through the drain pipe head 103. The cleaning waste liquid inside the gas cylinder will be discharged into the outer cylinder 1 through the drain port 15 on the storage cylinder 4. After the gas cylinder is cleaned and the cleaning waste liquid inside is discharged, the electric push rod 201 is activated to drive the L-shaped limiting frame 7 to descend and release the restriction on the gas cylinder. The inner cylinder 2 is then flipped to move the storage cylinder 4 to the six o'clock position. At this time, the stainless steel sand inside the gas cylinder loses the attraction of the magnet 8 and will automatically fall into the storage cylinder 4. Then, the inner cylinder 2 is flipped again so that the port of the hollow cylinder 3 is aligned with the discharge port 102 on the outer cylinder 1, so that the cleaned gas cylinder can slide out automatically.

[0031] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A gas cylinder internal cleaning device, characterized in that, include: An outer cylinder (1) and an inner cylinder (2) rotatably disposed within the outer cylinder (1), wherein a cleaning assembly is disposed within the inner cylinder (2); The cleaning assembly includes a hollow cylinder (3) and a storage cylinder (4) fixedly installed inside the inner cylinder (2). The storage cylinder (4) is provided with stainless steel sand for cleaning the inside of the gas cylinder. A push tube (5) is rotatably installed on the storage cylinder (4) and rotates with the inner cylinder (2). One end of the push tube (5) extends into the hollow cylinder (3) and is rotatably connected to the hollow cylinder (3), so that the gas cylinder flips and rotates during cleaning, which better cooperates with the stainless steel sand to clean the inside of the gas cylinder. The inner cylinder (2) is also provided with a flushing pipe (9) extending into the storage cylinder (4) at one end and out of the inner cylinder (2) at the other end, so as to deliver cleaning fluid into the gas cylinder. The inner cylinder (2) is also provided with an L-shaped limiting frame (7) that can be raised, lowered and moved laterally, so as to not only limit the gas cylinder in the hollow cylinder (3), but also press the gas cylinder against the abutment pipe (5). The shape of the L-shaped limiting frame (7) is similar to the outer contour of the gas cylinder. Multiple magnets (8) are fixedly installed on the L-shaped limiting frame (7) so that when the L-shaped limiting frame (7) limits the gas cylinder, the magnets (8) are close to the surface of the gas cylinder and attract the stainless steel sand inside the gas cylinder, so that the stainless steel sand is evenly and tightly attached to the inner wall of the gas cylinder. The inner cylinder (2) is provided with a frame (6) that can be raised and lowered. The L-shaped limiting frame (7) is provided in the frame (6) and is slidably connected to the frame (6). The two sides of the frame (6) are also provided with a push-back component that allows the L-shaped limiting frame (7) to move and reset. The L-shaped limiting frame (7) is provided with a trapezoidal protrusion (701). The hollow cylinder (3) is provided with a notch (301). When the L-shaped limiting frame (7) enters the hollow cylinder (3), the trapezoidal protrusion (701) and the edge of the notch (301) abut against each other, which will push the L-shaped limiting frame (7) to push the gas cylinder against the push tube (5). The rinsing pipe (9) consists of a main pipe (901), a first branch pipe (902), and a second branch pipe (903). The first branch pipe (902) is rotatably connected to the storage cylinder (4) and the main pipe (901). The water outlet of the first branch pipe (902) extends into the storage cylinder (4) and is misaligned with the abutment pipe (5). The first branch pipe (902) is connected to the frame (6) in a transmission manner, so that when the frame (6) drives the L-shaped limiting frame (7) to limit and abut the gas cylinder, the angle of the water outlet of the first branch pipe (902) is adjusted synchronously. When cleaning the gas cylinder, the cleaning liquid is poured into the gas cylinder opening. When the stainless steel sand needs to be discharged into the storage cylinder (4) after cleaning, it is misaligned with the gas cylinder opening to prevent the stainless steel sand from entering.

2. The internal cleaning device for gas cylinders as described in claim 1, characterized in that, A torsion spring (13) for rotational reset is provided between the first branch pipe (902) and the storage cylinder (4). A rocker plate (12) is fixedly provided on the first branch pipe (902). A top frame (11) for pushing the rocker plate (12) is fixedly provided on the frame (6). In this way, the angle of the water outlet end of the first branch pipe (902) is adjusted by pushing the rocker plate (12) to drive the first branch pipe (902) to rotate.

3. The internal cleaning device for gas cylinders as described in claim 1, characterized in that, The storage cylinder (4) is provided with a drain port (15). The part of the first branch pipe (902) inside the storage cylinder (4) is fixedly installed with a cover (14) that is opposite to the drain port (15). This allows the water outlet of the first branch pipe (902) to be opposite to the gas cylinder opening and the cover (14) to be misaligned with the drain port (15) during the cleaning of the gas cylinder, so that the cleaning waste liquid in the gas cylinder can be discharged. When the gas cylinder is cleaned and stainless steel sand needs to be discharged into the storage cylinder (4), the water outlet of the first branch pipe (902) is misaligned with the gas cylinder opening, and the cover (14) blocks the drain port (15) to prevent the stainless steel sand from being lost.

4. The internal cleaning device for gas cylinders as described in claim 1, characterized in that, The hollow cylinder (3) is equipped with a cleaning brush (303), and the inner cylinder (2) is also equipped with a spray pipe (10) connected to the second branch pipe (903) of the flushing pipe (9). This allows the gas cylinder to be cleaned with stainless steel sand when the hollow cylinder (3) rotates, and its surface can also be cleaned at the same time.

5. The internal cleaning device for gas cylinders as described in claim 1, characterized in that, The L-shaped limiting frame (7) is also rotatably provided with a rubber abutment (702), so that when the L-shaped limiting frame (7) is pressed against the bottom of the gas cylinder, it will not affect the rotation of the gas cylinder.

6. The internal cleaning device for gas cylinders as described in claim 1, characterized in that, The inner wall of the hollow cylinder (3) is inlaid with multiple sets of ring-shaped sliding beads (302) so that the gas cylinder experiences less frictional resistance when rotating inside the hollow cylinder (3).

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