CN220205415U - Steel bottle replacement device - Google Patents

Abstract

The utility model discloses a replacing device for a steel cylinder, and relates to the technical field of special gas supply. The steel cylinder replacing device comprises an operation box, a first driving assembly and a second driving assembly, wherein the steel cylinder is fixedly connected with the operation box, the connecting valve penetrates through the side wall of the operation box to extend into the operation box, and the axial direction of the valve seat is arranged along a first direction; the first driving component is arranged on the operation box and is configured to drive the valve handle to rotate; the output end of the second driving assembly is fixedly connected with the air pipe, and the second driving assembly is configured to drive the plug to be inserted into or pulled out of the valve seat along the first direction. The replacement device can automatically complete the replacement of the steel cylinder, human participation is not needed in the process, the operation box is not required to be opened, the environmental pollution or the damage to the health of operators is effectively avoided, and the operation safety is improved.

Description

Steel bottle replacement device

Technical Field

The utility model relates to the technical field of special gas supply, in particular to a steel cylinder replacement device.

Background

In industrial production, especially in chemical production, special gases such as nitrogen trichloride are often required to be used, and most of the gases are inhaled by human bodies or exposed to air, so that various injuries such as safety accidents and environmental pollution are easily caused, and careful attention is required.

In the mill, the connecting valve of the steel bottle filled with special gas is mostly stretched into the safe operation box, when the steel bottle needs to be replaced, an operator opens the safe operation box, exposes the whole connecting valve outside, stretches hands into the safe operation box, and manually screws a valve handle and plugs of the air pipes. However, when the plug is plugged, a small amount of special gas leaks, so that environmental pollution is easily caused, the body health of operators is easily damaged, and even explosion is caused when the plug is seriously plugged, so that huge economic loss is caused.

To solve the above problems, a device for replacing a steel cylinder needs to be developed to solve the problem of safety risk during manual operation.

Disclosure of Invention

The utility model aims to provide a steel cylinder replacement device which can automatically complete the replacement of the steel cylinder, does not need human participation in the process, does not need to open an operation box, effectively avoids environmental pollution or harm to the health of operators, and improves the operation safety.

To achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a change device of steel bottle, tracheal one end is provided with the plug, and the steel bottle includes the junction valve, the junction valve include the valve body and set up in disk seat and the valve handle of valve body, the valve handle with the valve body rotates to be connected in order to open or close the disk seat, change device includes:

the steel cylinder is fixedly connected with the operation box, the connecting valve penetrates through the side wall of the operation box and stretches into the operation box, and the axial direction of the valve seat is arranged along the first direction;

a first drive assembly disposed within the operator housing, the first drive assembly configured to drive rotation of the valve handle;

the output end of the second driving assembly is fixedly connected with the air pipe, and the second driving assembly is configured to drive the plug to be inserted into or pulled out of the valve seat along the first direction.

In some embodiments, the replacement device further comprises a locking assembly comprising:

the lifting platform is arranged in the operation box in a sliding manner along the first direction;

the locking piece is arranged on the lifting table, and the plug can be locked in the valve seat by the locking piece.

In some embodiments, the locking piece is a locking nut, the locking nut is rotatably arranged on the lifting platform, a locking groove is formed in the end face, facing the valve seat, of the locking nut, the air pipe penetrates through the locking nut, and the valve seat can partially enter the locking groove and is in threaded connection with the inner wall of the locking groove.

In some embodiments, the locking assembly further comprises a third driving piece, the locking nut comprises a nut body and a driving part, the driving part is arranged at intervals with the locking nut and fixedly connected with the locking nut, the locking nut penetrates through the lifting table, the nut body and the driving part are respectively located at two sides of the lifting table, and the third driving piece drives the nut body to rotate through the driving part.

In some embodiments, the locking assembly further comprises a fourth driving member and a lifting gear, a rack extending along the first direction is arranged on the inner wall of the operation box, the fourth driving member is fixedly arranged on the lifting table and can drive the lifting gear to rotate, and the lifting gear is meshed with the rack.

In some embodiments, the replacing device further comprises a limiting table, the limiting table is fixedly arranged on the inner wall of the operation box, and the locking piece locks the plug in the valve seat when the lifting table is in butt joint with the limiting table.

In some embodiments, the side wall of the valve handle is provided with a plurality of driving grooves along a circumferential interval, the first driving assembly comprises a turntable, a plurality of driving rods are arranged along the circumferential interval, the turntable is rotatably arranged in the operation box and coaxially arranged with the valve handle, and the driving rods are in one-to-one correspondence with the driving grooves and partially enter the driving grooves.

In some embodiments, the first driving assembly further comprises a first driving member, a driving wheel and a transmission belt, the turntable is coaxially connected with the driven wheel along the axial direction, the transmission belt is tensioned together by the driving wheel and the turntable, the first driving member is fixedly arranged in the operation box, and the first driving member can drive the driving wheel to rotate.

In some embodiments, the drive wheel and the driven wheel are synchronous wheels, and the drive belt is a synchronous belt.

In some embodiments, the replacing device further comprises a hose, a through hole is formed in the side wall of the operation box, the air pipe penetrates through the through hole, the aperture of the through hole is larger than the outer diameter of the air pipe, the hose is arranged outside the operation box and sleeved outside the air pipe, one end of the hose is connected with the negative pressure mechanism, and the other end of the hose is communicated with the through hole.

The utility model has the beneficial effects that:

the utility model provides a steel cylinder replacing device. In the replacing device, when the steel bottle needs to be replaced, the valve handle is driven to rotate through the first driving assembly to close the valve seat, and then the plug is driven to pull out the valve seat through the air pipe through the second driving assembly. At this time, the steel cylinder can be removed by a moving device such as a forklift and a new steel cylinder can be moved in. The plug is driven to be inserted into the valve seat by the second driving component through the air pipe, and then the valve handle is driven to rotate by the first driving component to open the valve seat, so that the replacement of the steel bottle is completed.

The replacement device of the steel bottle can automatically complete the replacement of the steel bottle, people do not need to participate in the process, the operation box does not need to be opened, environmental pollution or the physical health of operators can be effectively avoided, and the operation safety is improved.

Drawings

FIG. 1 is a schematic view of a steel cylinder according to the present utility model;

FIG. 2 is a schematic view of the steel cylinder and the device for replacing the steel cylinder according to the present utility model;

FIG. 3 is a schematic view of a device for replacing a steel cylinder according to the present utility model;

fig. 4 is a cross-sectional view of a locking assembly provided by the present utility model.

In the figure:

100. a bottle body; 101. a valve body; 102. a valve seat; 103. a valve handle; 1031. a driving groove; 201. an air pipe; 202. a plug;

1. an operation box; 2. a first drive assembly; 3. a second drive assembly; 4. a locking assembly;

11. a rack; 12. a limiting table; 13. a through hole; 21. a turntable; 22. a driving rod; 23. a first driving member; 24. a driving wheel; 25. a transmission belt; 26. driven wheel; 31. a hydraulic tank; 32. a hydraulic rod; 33. a connecting piece; 41. a lifting table; 42. a lock nut; 43. a third driving member; 44. a transmission gear; 45. a fourth driving member; 46. a lifting gear;

421. a locking groove; 422. a nut body; 423. a driving section; 424. and a guiding inclined plane.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "fixed" are to be construed broadly, and may be, for example, either fixed or removable; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Unless expressly stated or limited otherwise, a first feature being "above" or "below" a second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of a steel cylinder, fig. 2 is a schematic structural view of the steel cylinder and a replacing device of the steel cylinder, fig. 3 is a schematic structural view of the replacing device of the steel cylinder, and fig. 4 is a sectional view of a locking assembly. As shown in fig. 1 to 4, the steel cylinder includes a cylinder body 100 and a connection valve, wherein the cylinder body 100 is used for containing a special gas (such as nitrogen trichloride), and the connection valve is used for being connected with an external pipeline to transmit the special gas. Specifically, the connecting valve includes a valve body 101, and a valve seat 102 and a valve handle 103 provided to the valve body 101, the valve handle 103 being rotatably connected to the valve body 101 to open or close the valve seat 102, thereby controlling the communication condition of the special gas in the bottle 100 with an external pipe. Specifically, the external pipeline comprises an air pipe 201, one end of the air pipe 201 is provided with a plug 202, and the plug 202 is inserted into the valve seat 102.

In the factory, the connecting valve of the steel cylinder is mostly extended into the safety operation box, when the steel cylinder needs to be replaced, an operator opens the safety operation box, exposes the whole connecting valve outside, extends the hand into the safety operation box, and manually screws the valve handle 103 and the plug 202 of the plug air pipe 201. However, when the plug 202 is plugged in or plugged out, a small amount of special gas leaks, which easily causes environmental pollution or damages the health of operators, and even causes explosion when serious, so that huge economic loss is caused.

In order to solve the above-mentioned problems, this embodiment provides a replacing device (hereinafter referred to as replacing device) for a steel cylinder, as shown in fig. 2 to 4, the replacing device includes an operation box 1, a first driving assembly 2 and a second driving assembly 3, the steel cylinder is fixedly connected with the operation box 1, a connecting valve penetrates through a side wall of the operation box 1 and stretches into the operation box 1, and an axial direction of a valve seat 102 is set along a first direction (X direction in the drawing); the first driving assembly 2 is arranged in the operation box 1, and the first driving assembly 2 is configured to drive the valve handle 103 to rotate; the output end of the second driving assembly 3 is fixedly connected with the air pipe 201, and the second driving assembly 3 is configured to drive the plug 202 to insert or extract the valve seat 102 in the first direction.

In this replacement device, when the cylinder needs to be replaced, the valve handle 103 is driven to rotate by the first driving unit 2 to close the valve seat 102, and then the plug 202 is driven to pull out the valve seat 102 by the second driving unit 3 through the air pipe 201. At this time, the steel cylinder can be removed by a moving device such as a forklift and a new steel cylinder can be moved in. The plug 202 is driven by the second driving assembly 3 through the air pipe 201 to be inserted into the valve seat 102, and then the valve handle 103 is driven by the first driving assembly 2 to rotate to open the valve seat 102, so that the replacement of the steel cylinder is completed.

The replacement device of the steel bottle can automatically complete the replacement of the steel bottle, people do not need to participate in the process, the operation box 1 does not need to be opened, environmental pollution or the physical health of operators can be effectively avoided, and the operation safety is improved.

In practical production, the steel cylinder is mostly horizontally placed to improve stability, and in order to facilitate insertion of the plug 202 into the valve seat 102, the axial direction of the valve seat 102 is vertically arranged, that is, the first direction is a vertical direction, and the rotation axis of the valve handle 103 horizontally extends.

It will be appreciated that even though automatic operation may be achieved when the cylinder is replaced, there must be a small amount of leakage of the specialty gas when the plug 202 is pulled out of the valve seat 102, which may cause environmental pollution.

As shown in fig. 2 and 3, in the present embodiment, the operation box 1 has a sealable structure, a through hole 13 is formed in a side wall of the operation box 1, and an air pipe 201 is provided to penetrate the through hole 13. The air pipe 201 enters the operation box 1 through the through hole 13, and the air pipe 201 can move in the through hole 13 to insert or extract the plug 202. The sealed operation box 1 can prevent a small amount of leaked special gas from escaping to the outside and polluting the environment.

It will be appreciated that sealing the specialty gas in the operator's compartment 1 also presents a certain safety hazard. In order to further improve the safety, the replacing device further comprises a hose (not shown in the figure), the aperture of the through hole 13 is larger than the outer diameter of the air pipe 201, the hose is arranged outside the operation box 1 and sleeved outside the air pipe 201, one end of the hose is connected with the negative pressure mechanism, and the other end of the hose is communicated with the through hole 13.

Because the space of the through hole 13 is larger than the outer diameter of the air pipe 201, when the negative pressure mechanism is started, the gas in the operation box 1 can enter the hose through the gap between the air pipe 201 and the inner wall of the through hole 13, and can enter the collecting device or the special gas treatment device connected with the other end of the hose along with the hose, so that the environment is prevented from being polluted by special gas leakage. Moreover, the hose can also provide a certain protection for the air tube 201.

It should be noted that, as shown in fig. 1 to 3, in order to facilitate rotating the valve handle 103, a plurality of driving grooves 1031 are circumferentially spaced on the side wall of the valve handle 103, the first driving assembly 2 includes a turntable 21, a plurality of driving rods 22 are circumferentially spaced on the turntable 21, the turntable 21 is rotatably disposed in the operation box 1 and coaxially disposed with the valve handle 103, and the plurality of driving rods 22 are in one-to-one correspondence with the plurality of driving grooves 1031 and partially enter the driving grooves 1031.

When the dial 21 rotates, the driving lever 22 can drive the valve handle 103 to rotate through the corresponding driving groove 1031 to open or close the valve seat 102. The plurality of driving rods 22 can uniformly distribute the force for driving the valve handle 103 to rotate on the circumference of the valve handle 103, so that the valve handle 103 can rotate conveniently, and the valve handle 103 is prevented from being deflected due to uneven stress so as to increase the resistance to rotation.

As shown in fig. 2 and 3, the first driving assembly 2 further includes a first driving member 23, a driving wheel 24, and a driving belt 25, the turntable 21 is coaxially connected with a driven wheel 26 along an axial direction, the driving belt 25 is tensioned together with the turntable 21 by the driving wheel 24, the first driving member 23 is fixedly disposed in the operation box 1, and the first driving member 23 can drive the driving wheel 24 to rotate.

The first driving member 23 can drive the driving wheel 24 to rotate, the driving wheel 24 drives the driven wheel 26 to rotate through the transmission belt 25, and the driven wheel 26 is coaxially connected with the turntable 21, so that the turntable 21 rotates to drive the valve handle 103 to rotate.

In this embodiment, the driving wheel 24 and the driven wheel 26 are both synchronous wheels, and the transmission belt 25 is a synchronous belt. The synchronous wheel and the synchronous belt can be meshed, so that synchronous movement of the synchronous wheel and the synchronous belt is ensured, and slipping is prevented. Further, the first driving member 23 is a servo motor, and the servo motor can monitor torque when driving the turntable 21 to rotate, so as to determine whether the valve handle 103 rotates in place, so that the synchronous belt and the synchronous wheel can ensure that torque at the turntable 21 is transmitted to the servo motor, and accuracy of torque monitoring is improved.

As shown in fig. 2 and 3, the second driving assembly 3 includes a second driving member and a connecting member 33, the connecting member 33 is fixedly connected with the air pipe 201, the second driving member is disposed at the top of the operation box 1, the output end of the second driving member is connected with the connecting member 33, and the second driving member can drive the air pipe 201 to lift through the connecting member 33, so that the plug 202 is driven to insert into or withdraw from the valve seat 102.

In this embodiment, the second driving member is a hydraulic tank 31, the second driving assembly 3 further includes a hydraulic rod 32, one end of the hydraulic rod 32 is connected to the hydraulic tank 31, the other end of the hydraulic rod 32 is connected to a connecting member 33, when the hydraulic tank 31 generates positive pressure, the hydraulic rod 32 stretches, and the connecting member 33 drives the air pipe 201 to move downward, so that the plug 202 is inserted into the valve seat 102. When negative pressure is generated in the hydraulic tank 31, the hydraulic rod 32 is shortened, and the connecting member 33, i.e., the driving air pipe 201, moves upward, so that the plug 202 pulls out the valve seat 102.

In the present embodiment, two hydraulic tanks 31 are provided and are symmetrically disposed with respect to the air pipe 201, both hydraulic rods 32 are connected to both hydraulic tanks 31, and both ends of the connecting member 33 are connected to the corresponding hydraulic rods 32. When the two hydraulic tanks 31 simultaneously generate pressure, the hydraulic rods 32 at the two ends of the connecting piece 33 simultaneously extend or shorten, so that the connecting piece 33 is ensured to be stressed uniformly, stably ascend or descend, and the air pipe 201 is prevented from being bent.

It will be appreciated that in order to ensure tightness between the plug 202 and the valve seat 102, the outer periphery of the plug 202 is provided with a plurality of sealing rings at radial intervals, which are pressed to ensure tightness when the plug 202 is inserted into the valve seat 102.

Because the gas in the steel cylinder is high-pressure gas, when the valve handle 103 is rotated to open the valve seat 102, the gas easily washes the plug 202 out of the valve seat 102, so that the special gas leaks. As shown in fig. 2 to 4, to solve the above-mentioned problem, the replacing device further includes a locking assembly 4, wherein the locking assembly 4 includes a lifting table 41 and a locking member, the lifting table 41 is slidably disposed in the operation box 1 along the first direction, the locking member is disposed on the lifting table 41, and the locking member can lock the plug 202 in the valve seat 102. The lifting table 41 can control the locking piece to be close to or far away from the valve seat 102, when the plug 202 is inserted into the valve seat 102, the lifting table 41 descends, and the locking piece is locked with the valve seat 102 to prevent the plug 202 from being separated from the valve seat 102, so that the connection reliability of the steel cylinder and the air pipe 201 is ensured; when the steel cylinder needs to be replaced, the locking piece is unlocked from the valve seat 102, the lifting table 41 is lifted, and the second driving assembly 3 drives the plug 202 to pull out the valve seat 102.

As shown in fig. 2 to 4, the locking member is a locking nut 42, the locking nut 42 is rotatably provided on the lifting table 41, a locking groove 421 is provided on an end surface of the locking nut 42 facing the valve seat 102, the air pipe 201 is provided through the locking nut 42, and the valve seat 102 can partially enter the locking groove 421 and be screwed to an inner wall of the locking groove 421. When the locking nut 42 and the valve seat 102 can be locked through threads, the locking nut 42 and the valve seat 102 are prevented from being separated, so that the bottom surface of the locking groove 421 can abut against the plug 202, and the plug 202 is prevented from being separated from the valve seat 102.

As shown in fig. 4, the inner wall of the notch of the locking groove 421 is provided with a guiding inclined plane 424, the guiding inclined plane 424 is inclined outwards in a direction away from the bottom of the locking groove 421, and when the lifting table 41 descends, the guiding inclined plane 424 can abut against the valve seat 102 to guide the locking nut 42, so that even if a certain deviation exists between the locking nut 42 and the valve seat 102, the valve seat 102 can enter the locking groove 421, and damage caused by direct collision between the locking nut 42 and the valve seat 102 is avoided.

Preferably, the locking assembly 4 further includes a third driving member 43, the locking nut 42 includes a nut body 422 and a driving portion 423, the driving portion 423 is disposed at intervals with the locking nut 42 and is fixedly connected with the locking nut 42, the locking nut 42 is disposed on the lifting table 41 in a penetrating manner, the nut body 422 and the driving portion 423 are respectively disposed on two sides of the lifting table 41, and the third driving member 43 drives the nut body 422 to rotate through the driving portion 423.

The nut body 422 and the driving part 423 located at both sides of the elevating table 41 can restrict the relative position between the locking nut 42 and the elevating table 41 in the vertical direction so that the locking nut 42 can only rotate with respect to the elevating table 41, which is synchronously moved in the vertical direction. The third driving member 43 can drive the nut body 422 to rotate by the driving portion 423, so that the locking nut 42 and the valve seat 102 can be locked or unlocked.

Wherein the driving part 423 is of a gear structure, the locking assembly 4 further comprises a transmission gear 44, the third driving member 43 can drive the transmission gear 44 to rotate, and the transmission gear 44 is meshed with the driving part 423.

In this embodiment, the third driving member 43 is a servo motor, and the third driving member 43 can monitor the torque when driving the locking nut 42 to rotate, so as to determine whether the locking nut 42 has rotated in place, so that the synchronous belt and the synchronous wheel can ensure that the torque at the turntable 21 is transmitted to the servo motor, and the accuracy of torque monitoring is improved.

As shown in fig. 2 and 3, the locking assembly 4 further includes a fourth driving member 45 and a lifting gear 46, the rack 11 extending in the first direction is disposed in the operation box 1, the fourth driving member 45 is fixedly disposed on the lifting table 41 and is capable of driving the lifting gear 46 to rotate, and the lifting gear 46 is engaged with the rack 11. The fourth driving member 45 drives the lifting gear 46 to rotate, so as to drive the lifting table 41 to move in the vertical direction.

Specifically, the fourth driving member 45 may be a rotating motor or other form of driving member as long as the rotation speed and the number of turns of the lifting gear 46 can be precisely controlled. In this embodiment, two fourth driving members 45 are provided, and the two fourth driving members 45 are respectively located at two ends of the lifting platform 41, two racks 11 are correspondingly provided in the operation box 1, and each fourth driving member 45 drives one lifting gear 46 to engage with the corresponding rack 11, so as to ensure stability of the lifting platform 41 in the lifting process.

As shown in fig. 2 and 3, the replacing device further includes a stopper 12, the stopper 12 is fixedly disposed in the operation box 1, and the plug 202 is locked in the valve seat 102 by the locking member when the lifting table 41 abuts against the stopper 12. In this embodiment, the locking member is the locking nut 42, and the limiting platform 12 can limit the lifting platform 41 when descending, so as to prevent the locking nut 42 from colliding with the valve seat 102 due to exceeding a reasonable stroke when the fourth driving member 45 drives the lifting platform 41 to descend.

It will be appreciated that the position of the stop table 12 cannot be too high, otherwise the lifting table 41 cannot be lowered to a suitable height to screw the lock nut 42 with the valve seat 102, nor cannot the position of the stop table 12 be too low, otherwise the function of protecting the lock nut 42 and the valve seat 102 cannot be achieved.

When the fourth driving member 45 drives the lifting table 41 to descend until the locking nut 42 contacts the valve seat 102, the third driving member 43 drives the locking nut 42 to rotate, at this time, the locking nut 42 is in threaded connection with the valve seat 102, and the lifting table 41 will continue to descend along with the locking nut 42 for a distance until the locking nut 42 and the valve seat 102 are locked. Therefore, in the present embodiment, when the lifting table 41 is lowered to contact with the stopper table 12, the lock nut 42 can be locked with the valve seat 102, so that interference caused by the abutment of the stopper table 12 with the lifting table 41 before the lock nut 42 and the valve seat 102 are locked is avoided.

The foregoing is merely exemplary of the present utility model, and those skilled in the art should not be considered as limiting the utility model, since modifications may be made in the specific embodiments and application scope of the utility model in light of the teachings of the present utility model.

Claims (10)

1. A replacement device of a steel cylinder, one end of an air pipe (201) being provided with a plug (202), the steel cylinder comprising a connection valve, the connection valve comprising a valve body (101) and a valve seat (102) and a valve handle (103) arranged in the valve body (101), the valve handle (103) being rotatably connected with the valve body (101) to open or close the valve seat (102), characterized in that the replacement device comprises:

the steel cylinder is fixedly connected with the operation box (1), the connecting valve penetrates through the side wall of the operation box (1) and stretches into the operation box (1), and the axial direction of the valve seat (102) is arranged along the first direction;

a first drive assembly (2), the first drive assembly (2) being disposed within the operator housing (1), the first drive assembly (2) being configured to drive the valve handle (103) in rotation;

and the output end of the second driving assembly (3) is fixedly connected with the air pipe (201), and the second driving assembly (3) is configured to drive the plug (202) to be inserted into or pulled out of the valve seat (102) along the first direction.

2. The exchange device of a steel cylinder according to claim 1, characterized in that it further comprises a locking assembly (4), said locking assembly (4) comprising:

a lifting table (41), wherein the lifting table (41) is arranged in the operation box (1) in a sliding manner along the first direction;

and a locking member provided on the lifting table (41) and capable of locking the plug (202) in the valve seat (102).

3. The replacement device for the steel cylinder according to claim 2, wherein the locking member is a locking nut (42), the locking nut (42) is rotatably arranged on the lifting table (41), a locking groove (421) is formed in an end surface of the locking nut (42) facing the valve seat (102), the air pipe (201) penetrates through the locking nut (42), and the valve seat (102) can partially enter the locking groove (421) and be in threaded connection with an inner wall of the locking groove (421).

4. A steel cylinder replacing device according to claim 3, wherein the locking assembly (4) further comprises a third driving member (43), the locking nut (42) comprises a nut body (422) and a driving portion (423), the driving portion (423) is arranged at intervals with the locking nut (42) and fixedly connected with the locking nut (42), the locking nut (42) is arranged on the lifting table (41) in a penetrating mode, the nut body (422) and the driving portion (423) are respectively located on two sides of the lifting table (41), and the third driving member (43) drives the nut body (422) to rotate through the driving portion (423).

5. The steel cylinder replacement device according to claim 2, wherein the locking assembly (4) further comprises a fourth driving member (45) and a lifting gear (46), the inner wall of the operation box (1) is provided with a rack (11) extending along the first direction, the fourth driving member (45) is fixedly arranged on the lifting table (41) and can drive the lifting gear (46) to rotate, and the lifting gear (46) is meshed with the rack (11).

6. The steel cylinder replacement device according to claim 2, further comprising a limiting table (12), wherein the limiting table (12) is fixedly arranged on the inner wall of the operation box (1), and the locking member locks the plug (202) in the valve seat (102) when the lifting table (41) abuts against the limiting table (12).

7. The replacement device for steel cylinders according to any one of claims 1 to 6, wherein a plurality of driving grooves (1031) are formed in the side wall of the valve handle (103) at intervals in the circumferential direction, the first driving assembly (2) comprises a rotary table (21), a plurality of driving rods (22) are arranged in the rotary table (21) at intervals in the circumferential direction, the rotary table (21) is rotatably arranged in the operation box (1) and coaxially arranged with the valve handle (103), and the driving rods (22) are in one-to-one correspondence with the driving grooves (1031) and partially enter the driving grooves (1031).

8. The steel cylinder replacement device according to claim 7, wherein the first driving assembly (2) further comprises a first driving member (23), a driving wheel (24) and a transmission belt (25), the rotary table (21) is coaxially connected with a driven wheel (26) along the axial direction, the transmission belt (25) is tensioned together with the rotary table (21) by the driving wheel (24), the first driving member (23) is fixedly arranged in the operation box (1), and the first driving member (23) can drive the driving wheel (24) to rotate.

9. The exchange device of steel cylinders according to claim 8, characterized in that the driving wheel (24) and the driven wheel (26) are both synchronous wheels, and the transmission belt (25) is a synchronous belt.

10. The replacement device of a steel cylinder according to any one of claims 1 to 6, further comprising a hose, wherein a through hole (13) is provided in a side wall of the operation box (1), the air pipe (201) is provided to pass through the through hole (13), an aperture of the through hole (13) is larger than an outer diameter of the air pipe (201), the hose is provided outside the operation box (1) and is sleeved outside the air pipe (201), one end of the hose is connected with a negative pressure mechanism, and the other end is communicated with the through hole (13).