Driving device of ball valve

Abstract

The invention relates to the technical field of ball valve driving, the ball valve driving device comprises a mounting shell fixed to the outer side of a valve seat and a double-shaft-extension motor fixed in the mounting shell, a rotating shaft at one end of the double-shaft-extension motor is coaxially and fixedly connected with a valve rod, and a manual assembly is arranged on the outer side of the mounting shell; the manual assembly comprises a support fixed to the outer side of the mounting shell, a hand wheel rotationally arranged on the support and a connecting pipe fixed to the side, facing the mounting base, of the hand wheel. The other rotating shaft end of the double-shaft-extension motor extends out of the mounting shell, and a power-off plug connector is arranged between the other rotating shaft end of the double-shaft-extension motor and the connecting pipe. The control method has the advantage that the problem that dangerous accidents are easily caused due to the fact that operation of the valve cannot be controlled through other driving modes when emergency dangers and other situations such as power failure occur is solved.

Description

Technical Field

[0001] The present application relates to the technical field of ball valve driving, and in particular to a driving device for a ball valve. Background Art

[0002] As a common fluid control device, ball valves are widely used in many industries such as petroleum, chemical industry, and electric power. The main function of a ball valve is to control the flow of the medium in the pipeline by rotating the valve core. It has the advantages of simple structure, convenient operation, and good sealing performance. In recent years, with the improvement of industrial automation level, higher requirements have been put forward for the driving mechanism of ball valves, which not only need to achieve precise opening and closing control, but also need to ensure reliability and safety under various working conditions.

[0003] In the existing ball valve driving technology, electric, pneumatic or hydraulic methods are usually used to drive the opening and closing of the ball valve. Specifically, the electric driving method mainly uses the motor to drive the gear, belt or other transmission mechanism to rotate the ball valve; the pneumatic driving method uses compressed air to push the piston or cylinder to drive the ball valve to rotate; the hydraulic driving method uses the pressure of the hydraulic oil to push the piston to achieve the rotation of the ball valve.

[0004] Although the existing driving methods can basically meet the basic functional requirements of the ball valve, the existing control methods are usually one of the above-mentioned driving methods. When emergency situations such as power outages occur, the valve operation cannot be controlled by other driving methods, which can easily cause dangerous accidents. Summary of the invention

[0005] In order to solve the problem that in emergency situations such as power outages, the valve operation cannot be controlled by other driving methods, which may easily cause dangerous accidents, the present application provides a ball valve driving device.

[0006] The driving device of a ball valve provided in the present application adopts the following technical solution: A driving device for a ball valve comprises a mounting shell fixed to the outside of a valve seat, a double-axle extension motor fixed in the mounting shell, a rotating shaft at one end of the double-axle extension motor being coaxially fixedly connected to a valve stem, a manual assembly being arranged on the outside of the mounting shell, the manual assembly comprising a bracket fixed to the outside of the mounting shell, a hand wheel rotating on the bracket, and a connecting pipe fixed on the hand wheel facing the side of the mounting seat, the other rotating shaft end of the double-axle extension motor extending out of the mounting shell and a power-off connector being arranged between the rotating shaft end and the connecting pipe.

[0007] By adopting the above technical solution, when the external circuit is powered on, the double-shaft extension motor operates, the shaft of the double-shaft extension motor rotates, and the valve stem also rotates synchronously; when the external circuit is powered off, the power-off connector is connected to the connecting pipe, so that the hand wheel is turned, so that the hand wheel and the shaft of the double-shaft extension motor rotate synchronously, thereby realizing manual adjustment and rotation of the valve stem. The problem that when an emergency situation such as power failure occurs, the valve operation cannot be controlled by other driving methods, which is easy to cause dangerous accidents, is solved, and the operation of the valve can be controlled by turning the hand wheel even when the power is off.

[0008] Optionally, the shaft of the double-axis extension motor is made of insulating material, and a slide groove is provided at one end of the shaft of the double-axis extension motor facing the handwheel, and the power-off connector includes an electromagnet fixed in the slide groove, a plug block sliding in the slide groove, and a first spring fixed on the plug block, the other end of the first spring is fixed in the slide groove, an annular conductive plate is provided on the outer side of the shaft of the double-axis extension motor, and a conductive rod is fixed in the mounting shell, one end of the conductive rod contacting the annular conductive plate is in contact with and electrically connected to the annular conductive plate, and one end of the conductive rod away from the annular conductive plate is electrically conductive to an external circuit, and in an initial state, the plug block is attracted to the electromagnet, and a limit member is provided in the connecting tube for limiting the rotation of the plug block in the connecting tube.

[0009] By adopting the above technical solution, when the external circuit is energized, the conductive rod is energized, so that the annular conductive plate is also energized, the electromagnet generates magnetism, the plug slides toward the electromagnet and is attracted to the electromagnet, and the first spring is squeezed to produce elastic deformation; when the external circuit is powered off, the magnetism of the electromagnet disappears, the plug slides toward the direction away from the electromagnet, the first spring restores the elastic deformation and drives the plug to slide into the connecting tube.

[0010] Optionally, the limiting member includes a plurality of limiting balls sliding on the inner wall of the connecting tube and a second spring fixed on the limiting balls. The inner wall of the connecting tube is provided with a plurality of grooves evenly spaced apart. The limiting balls slide in the grooves in a direction perpendicular to the axial direction of the connecting tube. One end of the second spring is fixed to the inner wall of the groove, and the other end of the second spring is fixed to the limiting ball.

[0011] By adopting the above technical solution, when the external circuit is powered off and the plug slides into the connecting tube, the limiting ball in contact with the side wall of the plug is squeezed, causing the limiting ball to slide into the corresponding groove. At the same time, the second spring is squeezed to produce elastic deformation, and the remaining limiting balls are blocked on both sides of the plug, making it difficult for the plug to rotate in the connecting tube, thereby making the connection between the plug and the connecting tube more stable.

[0012] Optionally, an edge of one end of the insert block facing the hand wheel is arc-shaped.

[0013] By adopting the above technical solution, the arc-shaped setting can make the limiting ball in contact with the side wall of the plug block easier to be squeezed, thereby enhancing the connection stability between the limiting ball and the side wall of the plug block.

[0014] Optionally, an inlet is provided on one side of the valve seat, and an outlet is provided on the other side, a ball is rotatably arranged in the valve cavity of the valve seat, a guide hole is penetrated through the ball, an air filling groove is provided on the circumference of the ball, a flexible belt for sealing the air filling groove is fixed on the air filling groove, a pressurizing device for inflating the air into the air filling groove is installed in the mounting shell, and when the valve stem is driven to rotate by the double-axis extension motor, the pressurizing device is synchronously driven to operate.

[0015] By adopting the above technical solution, when the medium in the pipeline needs to pass through the valve seat, the medium flows in from the inlet of the valve seat, passes through the guide hole, and then flows out from the outlet of the valve seat; when the medium in the pipeline does not need to pass through the valve seat, by rotating the ball 90 degrees, the guide hole is blocked, the inlet and outlet are not connected, and the medium cannot pass through the valve seat. The double-axis extension motor drives the valve stem to rotate, and the pressurizing device operates synchronously. When pressurizing and inflating the inflation tank, the flexible belt expands and ensures a tight connection; when air is sucked into the inflation tank, the flexible belt is in a deflated state, and the ball is not tightly connected to the inner wall of the valve cavity, and the ball can be easily rotated.

[0016] Optionally, the pressurizing device includes an inflation hood fixed on the inner wall of the mounting shell, a piston sliding on the inner wall of the inflation hood, a reciprocating screw coaxially fixed on the outside of the dual-axis motor shaft, and an air pipe arranged between the inflation hood and the inflation groove, and the piston is threadedly connected to the reciprocating screw.

[0017] By adopting the above technical solution, in the initial state, the piston is at the bottom of the inflatable hood, at which time the flexible belt is in an expanded state, the sphere is tightly connected to the inner wall of the valve cavity, and the guide hole is connected to the inner cavity of the valve seat. When the reciprocating screw rotates, the piston first slides toward the top of the inflatable hood. At this time, the pressure device is in an air-inhaling state, and air is inhaled from the inflatable groove through the trachea. The flexible belt changes from an expanded state to a deflated state, and the sphere is easy to rotate. When the sphere rotates to 45 degrees, the piston slides to the top of the inflatable hood. At this time, the reciprocating screw continues to rotate, and the piston slides from the top of the inflatable hood to the bottom of the inflatable hood. At this time, the pressure device is in an inflated state, and air is inflated into the inflatable groove through the trachea, so that the flexible belt gradually expands. When the sphere rotates from the initial state to 90 degrees, the flexible belt changes from a deflated state to a maximum expansion, and the sphere can block the outlet and the inlet. The arrangement of the pressurizing device enables the flexible belt to gradually change from an expanded state to a deflated state and then to an expanded state when the piston slides from the bottom of the inflatable hood to the top of the inflatable hood and then to the bottom of the inflatable hood, thereby facilitating the rotation and fastening connection of the sphere.

[0018] Optionally, a mounting hole for embedding the air pipe is opened on the valve stem, the mounting hole is connected to the inflation groove, and the air pipe is embedded in the mounting hole.

[0019] By adopting the above technical solution, the setting of the mounting hole can fix the air pipe on the valve stem, so that the air pipe will not be entangled when the valve stem rotates, thereby ensuring the stability of inflation and suction.

[0020] In summary, the present application includes at least one of the following beneficial technical effects: 1. When the external circuit is powered on, the double-axle extension motor operates, the shaft of the double-axle extension motor rotates, and the valve stem also rotates synchronously; when the external circuit is powered off, the power-off connector is connected to the connecting pipe, so that the hand wheel is turned, so that the hand wheel and the shaft of the double-axle extension motor rotate synchronously, thereby realizing manual adjustment and rotation of the valve stem. This solves the problem that when an emergency situation such as power failure occurs, the valve operation cannot be controlled by other driving methods, which is easy to cause dangerous accidents. The operation of the valve can be controlled by turning the hand wheel even when the power is off; 2. When the external circuit is powered on, the conductive rod is powered on, so that the annular conductive plate is also powered on, the electromagnet generates magnetism, the plug slides toward the electromagnet and is attracted to the electromagnet, and the first spring is squeezed to produce elastic deformation; when the external circuit is powered off, the magnetism of the electromagnet disappears, the plug slides away from the electromagnet, the first spring restores the elastic deformation and drives the plug to slide into the connecting tube; 3. When the external circuit is powered off and the plug slides into the connecting tube, the limiting ball in contact with the side wall of the plug is squeezed, causing the limiting ball to slide into the corresponding groove. At the same time, the second spring is squeezed to produce elastic deformation, and the remaining limiting balls are blocked on both sides of the plug, making it difficult for the plug to rotate in the connecting tube, thereby making the connection between the plug and the connecting tube more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure of a ball valve driving device according to an embodiment of the present application.

[0023] Figure 2 It is an exploded view of a driving device of a ball valve according to an embodiment of the present application.

[0024] Figure 3 It is a schematic diagram of the structure of the manual component in the embodiment of the present application.

[0025] Figure 4 It is a schematic diagram of the structure of the power-off connector and the limiting component in the embodiment of the present application.

[0026] Figure 5 It is a schematic diagram of the structure of the pressurizing device in the embodiment of the present application.

[0027] Figure numerals: 1. valve seat; 2. mounting shell; 3. double-axle extension motor; 4. manual assembly; 5. bracket; 6. handwheel; 7. connecting pipe; 8. power-off connector; 9. slide groove; 10. electromagnet; 11. plug-in block; 12. first spring; 13. annular conductive plate; 14. conductive rod; 15. limit piece; 16. limit ball; 17. second spring; 18. groove; 19. inlet; 20. outlet; 21. sphere; 22. guide hole; 23. inflation groove; 24. flexible belt; 25. pressurizing device; 26. inflation cover; 27. piston; 28. reciprocating screw; 29. ​​air pipe; 30. mounting hole; 31. valve stem. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-5 This application is described in further detail.

[0029] The embodiment of the present application discloses a driving device for a ball valve.

[0030] Reference Figure 1 and Figure 2 The driving device of the ball valve includes a mounting shell 2 and a double-shaft extension motor 3. The mounting shell 2 is fixed on the outside of the valve seat 1. The double-shaft extension motor 3 is fixed in the mounting shell 2. The rotating shaft of the double-shaft extension motor 3 is made of insulating material, and one end of the rotating shaft of the double-shaft extension motor 3 extends out of the mounting shell 2, and the other end of the rotating shaft of the double-shaft extension motor 3 is coaxially fixedly connected with the valve stem 31. In this embodiment, an annular conductive plate 13 is arranged on the outside of the rotating shaft of the double-shaft extension motor 3, and a conductive rod 14 is fixed in the mounting shell 2. One end of the conductive rod 14 that contacts the annular conductive plate 13 contacts the annular conductive plate 13, and the conductive rod 14 is electrically connected to the annular conductive plate 13. One end of the conductive rod 14 that is away from the annular conductive plate 13 is electrically connected to the external circuit. When the external circuit is energized, the conductive rod 14 is energized, so that the annular conductive plate 13 is also energized, and the double-shaft extension motor 3 is operated, the rotating shaft of the double-shaft extension motor 3 rotates, and the valve stem 31 also rotates synchronously.

[0031] Reference Figure 2 and Figure 3, since when an emergency or dangerous situation occurs, such as power failure, the valve operation cannot be controlled by other driving methods, which may easily cause dangerous accidents, a manual assembly 4 is provided on the outside of the mounting shell 2 in this embodiment, and the hand wheel 6 is rotated when the power is off, so that the hand wheel 6 and the rotating shaft of the double-axle extension motor 3 rotate synchronously, thereby realizing manual adjustment and rotation of the valve stem 31. The manual assembly 4 includes a bracket 5, a hand wheel 6, and a connecting pipe 7. The bracket 5 is fixed on the outside of the mounting shell 2, and the hand wheel 6 rotates on the bracket 5. The connecting pipe 7 is fixed on the side of the hand wheel 6 facing the mounting seat.

[0032] Reference Figure 2 and Figure 4 In this embodiment, a slide groove 9 is provided at one end of the rotating shaft of the double-axle extension motor 3 facing the hand wheel 6, and a power-off connector 8 is provided between the slide groove 9 and the connecting tube 7. The power-off connector 8 includes an electromagnet 10, an insert block 11, and a first spring 12. The electromagnet 10 is fixed on the bottom wall of the slide groove 9, the insert block 11 slides in the slide groove 9, one end of the first spring 12 is fixed on the insert block 11 and the other end of the first spring 12 is fixed on the bottom wall of the slide groove 9. The edge of the end of the insert block 11 facing the hand wheel 6 is in an arc shape, which can make the limiting ball 16 in contact with the side wall of the insert block 11 easier to be squeezed, thereby enhancing the connection stability between the limiting ball 16 in contact with the side wall of the insert block 11. A limiting member 15 is provided in the connecting tube 7, and the limiting member 15 is used to limit the rotation of the insert block 11 in the connecting tube 7. The limiting member 15 includes a plurality of limiting balls 16 and a second spring 17. The inner wall of the connecting tube 7 is evenly spaced with a plurality of grooves 18. The limiting ball 16 slides in the groove 18 in a direction perpendicular to the axial direction of the connecting tube 7. One end of the second spring 17 is fixed to the inner wall of the groove 18, and the other end of the second spring 17 is fixed to the limiting ball 16. When the external circuit is energized, the electromagnet 10 generates magnetism, the plug 11 slides toward the electromagnet 10 and is attracted to the electromagnet 10, and at this time the first spring 12 is squeezed to produce elastic deformation; when the external circuit is powered off, the magnetism of the electromagnet 10 disappears, the plug 11 slides toward the direction away from the electromagnet 10, the first spring 12 restores the elastic deformation and drives the plug 11 to slide into the connecting tube 7, at this time the limiting ball 16 in contact with the side wall of the plug 11 is squeezed, so that the limiting ball 16 slides into the corresponding groove 18, and at the same time the second spring 17 is squeezed to produce elastic deformation, and the remaining limiting balls 16 block the two sides of the plug 11, making it difficult for the plug 11 to rotate in the connecting tube 7, and at this time, turning the hand wheel 6 can realize the synchronous rotation of the shaft of the double-axis extension motor 3.

[0033] Reference Figure 1 and Figure 2, an inlet 19 is provided on one side of the valve seat 1, an outlet 20 is provided on the other side of the valve seat 1, a ball 21 is rotatably provided in the valve cavity of the valve seat 1, and a flow guide hole 22 is provided through the ball 21. When the medium in the pipeline needs to pass through the valve seat 1, the medium flows in from the inlet 19 of the valve seat 1, passes through the flow guide hole 22, and then flows out from the outlet 20 of the valve seat 1; when the medium in the pipeline does not need to pass through the valve seat 1, the ball 21 is rotated 90 degrees by rotating the valve stem 31, and the flow guide hole 22 is also rotated 90 degrees, the flow guide hole 22 is blocked, the inlet 19 and the outlet 20 are not connected, and the medium cannot pass through the valve seat 1.

[0034] Reference Figure 2 and Figure 5In order to make the ball 21 rotate synchronously when the valve stem 31 rotates, the present embodiment has an air filling groove 23 on the circumference of the ball 21, and a flexible belt 24 is fixed on the air filling groove 23, and the flexible belt 24 is used to block the air filling groove 23. In order to make the flexible belt 24 expand and shrink at will, a pressurizing device 25 for inflating the air filling groove 23 is installed in the mounting shell 2, and the double-axis extension motor 3 drives the valve stem 31 to rotate, and the pressurizing device 25 operates synchronously. When the air filling groove 23 is pressurized and inflated, the flexible belt 24 expands and ensures a tight connection. When air is sucked into the air filling groove 23, the flexible belt 24 is in a deflated state. At this time, the ball 21 is not tightly connected to the inner wall of the valve cavity, and the ball 21 can be easily rotated. The pressurizing device 25 includes an inflatable hood 26, a piston 27, a reciprocating screw rod 28, and an air pipe 29. The inflatable hood 26 is fixed on the inner wall of the mounting shell 2, the piston 27 slides on the inner wall of the inflatable hood 26, the reciprocating screw rod 28 is coaxially fixed on the outer side of the rotating shaft of the double-axis extension motor 3, and the piston 27 is threadedly connected to the reciprocating screw rod 28, and the air pipe 29 is arranged between the inflatable hood 26 and the inflatable groove 23. In order to fix the air pipe 29 on the valve stem 31 so that the air pipe 29 will not be entangled when the valve stem 31 rotates, and to ensure the stability of the inflatable suction, a mounting hole 30 is opened on the valve stem 31, and the mounting hole 30 is connected to the inflatable groove 23, and the air pipe 29 is embedded in the mounting hole 30. In the initial state, the piston 27 is at the bottom of the inflatable hood 26, at which time the flexible belt 24 is in an expanded state, the ball 21 is tightly connected to the inner wall of the valve cavity, and the guide hole 22 is connected to the inner cavity of the valve seat 1. When the reciprocating screw 28 rotates, the piston 27 first slides toward the top of the inflatable hood 26. At this time, the pressure device 25 is in the suction state, and air is sucked from the inflatable groove 23 through the air pipe 29. The flexible belt 24 changes from the expanded state to the deflated state, and the sphere 21 is easy to rotate. When the sphere 21 rotates to 45 degrees, the piston 27 slides to the top of the inflatable hood 26. At this time, the reciprocating screw 28 continues to rotate, and the piston 27 slides from the top of the inflatable hood 26 to the bottom of the inflatable hood 26. At this time, the pressure device 25 is in the inflatable state, and air is inflated into the inflatable groove 23 through the air pipe 29, so that the flexible belt 24 gradually expands. When the sphere 21 rotates from the initial state to 90 degrees, the flexible belt 24 changes from the deflated state to the maximum expansion. At this time, the sphere 21 can block the inlet 19 and the outlet 20.

[0035] The implementation principle of a ball valve driving device in an embodiment of the present application is as follows: when the external circuit is energized, the conductive rod 14 is energized, so that the annular conductive plate 13 is energized, the electromagnet 10 generates magnetism, and the plug 11 slides toward the direction close to the electromagnet 10 and is attracted to the electromagnet 10. At this time, the shaft of the double-axis extension motor 3 rotates, driving the valve stem 31 to rotate synchronously; when the external circuit is powered off, the magnetism of the electromagnet 10 disappears, and the plug 11 slides toward the direction away from the electromagnet 10 into the connecting tube 7. At this time, the limiting ball 16 in contact with the side wall of the plug 11 is squeezed, and the remaining limiting balls 16 are blocked on both sides of the plug 11, making it difficult for the plug 11 to rotate in the connecting tube 7. The hand wheel 6 is turned so that the hand wheel 6 and the shaft of the double-axis extension motor 3 rotate synchronously, thereby driving the valve stem 31 to rotate synchronously. When the shaft of the double-axis extension motor 3 rotates, the reciprocating screw 28 also rotates synchronously. In the initial state, the piston 27 is at the bottom of the inflation cover 26, the flexible belt 24 is in an expanded state, and the ball 21 is tightly connected to the inner wall of the valve cavity. When the piston 27 slides from the bottom of the inflation cover 26 to the top of the inflation cover 26, the pressure device 25 is in an air-inhaling state, and the flexible belt 24 changes from an expanded state to a gradually deflated state, making it easy for the ball 21 to rotate, and the ball 21 rotates 45 degrees, and the reciprocating screw 28 continues to rotate. At this time, when the piston 27 slides from the top of the inflation cover 26 to the bottom of the inflation cover 26, the pressure device 25 is in an inflated state, and the flexible belt 24 also gradually changes from a deflated state to an expanded state. The ball 21 rotates from the initial state to 90 degrees. At this time, the ball 21 can block the inlet and outlet 19, thereby preventing the medium from flowing into the valve cavity.

[0036] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second", "third" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and similar words do not indicate a quantitative limit, but indicate that there is at least one. "Include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0037] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A ball valve driving device, characterized in that: The invention comprises a mounting shell (2) fixed on the outside of a valve seat (1), a double-axle extension motor (3) fixed in the mounting shell (2), one end of the rotating shaft of the double-axle extension motor (3) being coaxially fixedly connected to a valve stem (31), a manual assembly (4) being arranged on the outside of the mounting shell (2), the manual assembly (4) comprising a bracket (5) fixed on the outside of the mounting shell (2), a hand wheel (6) rotating on the bracket (5), and a connecting pipe (7) fixed on the hand wheel (6) facing the side of the mounting seat, the other end of the rotating shaft of the double-axle extension motor (3) extending out of the mounting shell (2) and a power-off connector (8) being arranged between the rotating shaft and the connecting pipe (7).

2. A ball valve driving device according to claim 1, characterized in that: The rotating shaft of the double-axle extension motor (3) is made of insulating material. A sliding groove (9) is provided at one end of the rotating shaft of the double-axle extension motor (3) facing the hand wheel (6). The power-off connector (8) comprises an electromagnet (10) fixed in the sliding groove (9), an insert block (11) sliding in the sliding groove (9), and a first spring (12) fixed on the insert block (11). The other end of the first spring (12) is fixed in the sliding groove (9). An annular conductive plate is provided on the outer side of the rotating shaft of the double-axle extension motor (3). (13), a conductive rod (14) is fixed in the mounting shell (2), one end of the conductive rod (14) in contact with the annular conductive plate (13) is in contact with and electrically connected to the annular conductive plate (13), and one end of the conductive rod (14) away from the annular conductive plate (13) is electrically connected to an external circuit, in an initial state, the plug (11) is attracted to the electromagnet (10), and a limiter (15) is provided in the connecting tube (7) for limiting the rotation of the plug (11) in the connecting tube (7).

3. A ball valve driving device according to claim 2, characterized in that: The limiting member (15) comprises a plurality of limiting balls (16) sliding on the inner wall of the connecting tube (7), and a second spring (17) fixed on the limiting balls (16); the inner wall of the connecting tube (7) is provided with a plurality of grooves (18) at even intervals; the limiting balls (16) slide in the grooves (18) in a direction perpendicular to the axial direction of the connecting tube (7); one end of the second spring (17) is fixed on the inner wall of the groove (18), and the other end of the second spring (17) is fixed on the limiting balls (16).

4. A ball valve driving device according to claim 2, characterized in that: The edge of one end of the insert block (11) facing the hand wheel (6) is in an arc shape.

5. A ball valve driving device according to claim 1, characterized in that: The valve seat (1) is provided with an inlet (19) on one side and an outlet (20) on the other side. A ball (21) is rotatably arranged in the valve cavity of the valve seat (1). A flow guide hole (22) is penetrated through the ball (21). An air filling groove (23) is provided on the circumference of the ball (21). A flexible belt (24) for sealing the air filling groove (23) is fixed on the air filling groove (23). A pressurizing device (25) for filling the air filling groove (23) is installed in the mounting shell (2). When the valve stem (31) is driven to rotate by the double-axle extension motor (3), the pressurizing device (25) is driven to operate synchronously.

6. A ball valve driving device according to claim 5, characterized in that: The pressurizing device (25) comprises an air charging hood (26) fixed on the inner wall of the mounting shell (2), a piston (27) sliding on the inner wall of the air charging hood (26), a reciprocating screw rod (28) coaxially fixed on the outer side of the rotating shaft of the double-axle extension motor (3), and an air pipe (29) arranged between the air charging hood (26) and the air charging groove (23); the piston (27) is threadedly connected to the reciprocating screw rod (28).

7. A ball valve driving device according to claim 6, characterized in that: The valve stem (31) is provided with a mounting hole (30) for embedding the air pipe (29); the mounting hole (30) is connected to the inflation groove (23); and the air pipe (29) is embedded in the mounting hole (30).

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